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Garza-Delgado, Abelardo. "A study of casting distortion and residual stresses in die casting." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1196175848.
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Alkefer, Osama. "Magnesium twin roll casting machine - modelling and control." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=114504.
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In this thesis, a laboratory scale-pilot twin roll casting plant at CANMET-MTL is considered for modelling for control synthesis. Three important parts of the plant are considered for modelling: feeding system, solidification process and deformation process. The TRC machine is multi-input multi-output (MIMO) and nonlinear in nature. A simplified 2 X 2 feedback linear dynamical model is developed based on first principles and engineering intuition due to the lack of experimental data from the TRC machine. The proposed manipulated variables are the melt inflow rate and rollers angular velocity whereas the corresponding controlled variables are the head-box melt level and roll separating force. In this model, the effect of metallostatic pressure on solidification front position is modelled as a spring-damper mechanical system. Different parameter values of the first-order model are empirically tested until smooth movement of the solidification fronts is obtained. Casting speed is optimized using a theoretical model validated using numerical simulation data. The proposed model is mainly used to control the roll separating force in steady-state and maintain nominal performance. Therefore, simple proportional-integral (PI) decentralized controllers are designed using a trial-and-error method as a first attempt to control the process. Then a design of multivariable H-infinity optimal control is carried out using MATLAB hinfsyn function.<br>Dans cette thèse, un procédé pilote de coulée en bande à double rouleau de magnésium du laboratoire CANMET-MTL est considéré pour la modélisation orientée pour la conception de contrôleurs. Trois sections importantes de ce procédé sont considérées pour la modélisation: le système d'alimentation, le processus de solidification et le processus de déformation. La machine de coulée à double rouleau (twin-roll casting-TRC) est de nature multientrées-multisorties et non linéaire. Un modèle dynamique linéaire simplifié 2 X 2 est développé en se basant sur des principes physiques et une intuition d'ingénierie dû au manque de données expérimentales sur la machine TRC. On propose les variables manipulées comme étant le débit d'entrée de métal en fusion ainsi que la vitesse angulaire des rouleaux, alors que les variables contrôlées correspondantes sont le niveau de liquidus dans la boîte d'alimentation et la force de séparation des rouleaux. Dans ce modèle, l'effet de la pression métallostatique sur la position du front de solidification est modélisé par un système mécanique composé d'un ressort et d'un amortisseur. Différentes valeurs de paramètres de ce modèle de premier ordre sont testées de façon empirique jusqu'à ce qu'un mouvement sans à-coups du front de solidification soit obtenu. La vitesse de coulée est optimisée en utilisant un modèle théorique validé par l'utilisation de données de simulation numérique. Le modèle développé est utilisé principalement pour réguler la force de séparation des rouleaux en régime permanent et pour maintenir la performance nominale. En conséquence, de simples régulateurs décentralisés de type proportionnel-intégral (PI) sont conçus en guise de premier essai pour contrôler le procédé. Puis, un contrôleur multivariable H-infini est conçu en utilisant la fonction hinfsyn dans Matlab.
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Choudhury, Aswin K. "Study of the Effect of Die Casting Machine upon Die Deflections." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1391786517.
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Berg, Jonathan. "Further development of manufacturing method for polyurethane shoe press." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-86081.
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The press-section of a paper machine holds several different types of press rolls. One of the many press roll variants is the Valmet produced press roll, ViscoNip. This press roll utilizes an extended nip in order to increase the amount of water removed. The extended press nip in ViscoNip is special since it is controllable by a pressurized polyurethane press shoe. The press shoe runs through the body of the press roll. Due to the limits of the current production process, new manufacturing methods and construction solutions are needed. In cooperation with another thesis, the current design and manufacturing process was reviewed and a plan intended to improve the current solution was formulated. The plan was to, by working together in a project, perform a product development process intended to create concepts able to utilize new methods of manufacturing. By using established methods of concept generation, such as Brainwriting 6-3-5, 11 concepts were created. Some of these concepts involved a redesign of the press shoe, leading to a need for construction and performance analysis. The other thesis focusing on the structural and mechanical performance evaluation of the new concepts. The work of this thesis focusing on researching new possible and available manufacturing solutions. The new concepts were analyzed with new and possible manufacturing methods to fulfill all the requirements. With all data, a document was created and market research was made to get feedback from more knowledgeable in the subject. Moreover, sequence analysis between the concepts with the current and those new manufacturing methods was made to further explain which manufacturing method that could solve the main problem. All in all, one different redesigned concept was deemed as having potential for further development. The current solution was also deemed as having potential for future development but only when new manufacturing methods or techniques were considered.
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Lööv, Simon. "Comparison of Undersampling Methods for Prediction of Casting Defects Based on Process Parameters." Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-20596.
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Prediction of both big and small decisions is something most companies have to make on a daily basis. The importance of having a highly accurate technique for different decision-making is not something that is new. However, even though the importance of prediction is a fact to most people, current techniques for estimation are still often highly inaccurate. The consequences of an inaccurate prediction can be huge in the differences between the misclassifications. Not just in the industry but for many different areas. Machine learning have in the recent couple of years improved significantly and are now considered a reliable method to use for prediction. The main goal of this research is to predict casting defects with the help of a machine-learning algorithm based on process parameters. In order to achieve the main goal, some sub-objectives have been identified to successfully reach those goals. A problem when dealing with machine learning is an unbalanced dataset. When training a network, it is essential that the dataset is balanced. In this research we have successfully balanced the dataset. Undersampling was the method used in our research to establish our balanced dataset. The research compares and evaluates a couple of different undersample methods in order to see which undersampling is best suited for this project. Three different machine models, “random forest”, “artificial neural network”, and “k-nearest neighbor”, are also compared to each other to see what model performs best. The conlcusion reached was that the best method for both undersampling and machine learning model varied due to many different reasons. So, in order to find the best model with the best method for a specific job, all the models and methods need to be tested. However, the undersampling method that provided best performances most times in our research was the NearMiss version 2 model. Artificial Neural Network was the machine learning model that had most success in our research. It performed best in two out of three evaluations and comparisons.
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Bergström, Mikael. "Product Development and Finite Element Analysis of Polyurethane Press Shoe : Produktutveckling och finit element analys av press-sko i polyuretan." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-85657.
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The press-section of a paper machine holds several different types of press rolls. One of the many press roll variants is the Valmet produced press roll, ViscoNip. This press roll utilizes an extended nip in order to increase the amount of water removed. The extended press nip in ViscoNip is special since it is controllable by a pressurized polyurethane press shoe. The press shoe runs through the body of the press roll. Due to limits of the current production process, new manufacturing methods and construction solutions are needed. In cooperation with another thesis, the current design and manufacturing process was reviewed and a plan intended to improve the current solution was formulated. The plan was to, by working together in a project, perform a product development process intended to create concepts able to utilize new methods of manufacturing. By using established methods of concept generation, such as Brainwriting 6-3-5, 11 concepts were created. Some of these concepts involved a redesign of the press shoe, leading to a need for construction and performance analysis. With the other thesis focusing on researching new possible and available manufacturing solutions. The work of this thesis fully committed to the structural and mechanical performance evaluation of the new concepts. This was performed by creating a model of the technical application using Finite Element Modelling in ABAQUS. The model included a hyperelastic material model for the polyurethane material as well as cohesive zone modelling to account for partitioning of the part. The model was then used to simulate the different concepts as they were subjected to a challenging load case. The results of which were used as the basis for structural and performance analysis. The analysis showed proof of sufficient structural stability and mechanical performance for all evaluated concepts. Then, in cooperation with the other thesis, a final concept choice was made. All in all, three different redesigned concepts were deemed as having potential for further development. The current solution was also deemed as having potential for future development but only when new manufacturing methods or techniques were considered.
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Kokavec, Miroslav. "Návrh stroje pro odstředivé lití." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400920.
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This master’s thesis is focused on design of centrifugal casting machine. Thesis includes the sorting and description method of centrifugal casting with overview of available machines. Proposal of parameters of centrifugal casting machine is done. Thesis includes technical-economic review of projection proposal for main parts of the machine. Design parameters are calculated and plan of machine is done. Safety assessment of proposed of machine variant is done. 3D model and drawings are included in thesis.
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Mallard, Vincent. "Définition de machine asynchrone à très haute efficacité énergétique par actions conjuguées du cuivre rotorique et de l'acier à grains orientés." Thesis, Artois, 2018. http://www.theses.fr/2018ARTO0202.
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L’amélioration énergétique des machines électriques est un sujet de plus en plus important,avec dans la décennie à venir, l’utilisation massive de machines électriques pourles transports. Au niveau des industries, les moteurs électriques sont responsables d’environ67% de la consommation de l’énergie électrique. Ce travail de thèse s’inscrit dansl’optique de l’amélioration énergétique des machines asynchrones qui sont prépondérantesdans le milieu industriel. Le travail présenté porte sur l’utilisation de deux technologiespour augmenter le rendement avec l’utilisation combiné d’un circuit magnétique à basede tôles grains orientés (GO) et de la technologie d’une cage d’écureuil en cuivre injectésous pression. En effet, l’utilisation d’un acier plus performant comparativementaux aciers classiquement utilisés permet une réduction des pertes fer. Le remplacementde l’aluminium injecté, qui est classiquement utilisé dans la fabrication des cages d’écureuils,par du cuivre permet une réduction importante des pertes Joule au rotor. Dans unpremier temps, l’impact du processus de l’injection du cuivre en fusion sur les propriétésmagnétiques des tôles GO a été déterminé. Le processus a tout d’abord été étudié pardes simulations numériques 2D et 3D afin de déterminer les températures au niveau del’acier magnétique. Ces températures ont été appliquées sur des bandes d’Epstein pourdéterminer l’influence de celles-ci sur les propriétés magnétiques. Dans un second temps,l’utilisation des tôles GO en champ tournant a été étudiée par une méthode expérimentaleet par une modélisation numérique afin de comprendre la complexité du trajet duflux magnétique dans une telle structure de circuit magnétique. L’utilisation de cettetechnologie a permis d’obtenir un gain non négligeable en termes de pertes notammentsur les pertes fer. Dans la dernière partie, différents prototypes de machines asynchronesont été testés afin d’apprécier l’apport de ces deux technologies permettant d’apprécierun gain important en termes d’efficacité énergétique grâce à une procédure expérimentale<br>Definition of high efficiency induction machine using die casting copper squirrel cageand grain oriented steel laminations Nowadays, increasing the efficiency of electrical motorshas become a priority in order to reduce electricity consumption. This thesis dealswith the study of an induction machine composed of a copper squirrel cage realized byhigh pressure die casting and a magnetic circuit made of grain oriented electrical steel(GO) in order to decrease Joule losses and core losses. In the first part, the impact ofthermal shock induced by the die casting copper process on the GO electrical steel wasstudied in order to validate the use of GO in rotor magnetic circuit. The temperatureoccurs during this kind of process has been modeled by 2D and 3D models. An experimentalprocess was realized on the standardize samples in order to make a comparisonwith and without annealing in terms of magnetic properties. In the second part, the newassembly method of magnetic circuit with GO electrical steel has been studied in orderto increase the benefits of use of GO steel in AC machines. The last part, a comparisonbetween several configurations of magnetic circuit in induction machine was realized inorder to confirm the gain of die casting copper rotor with GO electrical steel and GOstator magnetic circuit
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Murugesan, Karthik Saravanan. "Predicting Parting Plane Separation And Tie Bar Loads In Die Casting Using ComputerMODELING AND DIMENSIONAL ANALYSIS." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1221175903.
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Kotriwala, Arzam Muzaffar. "Load Forecasting for Temporary Power Installations : A Machine Learning Approach." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-211554.
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Sports events, festivals, construction sites, and film sites are examples of cases where power is required temporarily and often away from the power grid. Temporary Power Installations refer to systems set up for a limited amount of time with power typically generated on-site. Most load forecasting research has centered around settings with a permanent supply of power (such as in residential buildings). On the contrary, this work proposes machine learning approaches to accurately forecast load for Temporary Power Installations. In practice, these systems are typically powered by diesel generators that are over-sized and consequently, operate at low inefficient load levels. In this thesis, a ‘Pre-Event Forecasting’ approach is proposed to address this inefficiency by classifying a new Temporary Power Installation to a cluster of installations with similar load patterns. By doing so, the sizing of generators and power generation planning can be optimized thereby improving system efficiency. Load forecasting for Temporary Power Installations is also useful whilst a Temporary Power Installation is operational. A ‘Real-Time Forecasting’ approach is proposed to use monitored load data streamed to a server to forecast load two hours or more ahead in time. By doing so, practical measures can be taken in real-time to meet unexpected high and low power demands thereby improving system reliability.<br>Sportevenemang, festivaler, byggarbetsplatser och film platser är exempel på fall där kraften krävs Tillfälligt eller och bort från elnätet. Tillfälliga Kraft Installationer avser system som inrättats för en begränsad tid med Vanligtvis ström genereras på plats. De flesta lastprognoser forskning har kretsat kring inställningar med permanent eller strömförsörjning (zoals i bostadshus). Tvärtom föreslår detta arbete maskininlärning metoder för att noggrant prognos belastning under Tillfälliga anläggningar. I praktiken är thesis Typiskt system drivs med dieselgeneratorer som är överdimensionerad och följaktligen arbetar ineffektivt vid låga belastningsnivåer. I denna avhandling är en ‘Pre-Event Casting’ Föreslagen metod för att ta itu med denna ineffektivitet genom att klassificera ett nytt tillfälligt ström Installation till ett kluster av installationer med liknande lastmönster. Genom att göra så, kan dimensioneringen av generatorer och kraftproduktion planering optimeras därigenom förbättra systemets effektivitet. Load prognoser för Tillfälliga Kraft installationer är ook användbar Medan en tillfällig ström Installationen är i drift. En ‘Prognoser Real-Time’ Föreslagen metod är att använda övervakade lastdata strömmas till en server att förutse belastningen två timmar eller mer i förväg. Genom att göra så, kan praktiska åtgärder vidtas i realtid för att möta oväntade höga och låga effektbehov och därigenom förbättra systemets tillförlitlighet.
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Dalin, Jean-Baptiste. "Modelisation numerique de la coulee continue." Paris, ENMP, 1987. http://www.theses.fr/1987ENMP0030.
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Etude du gonflement des brames lors de la solidification. Developpement de deux logiciels de simulation tridimensionnelle et bidimensionnelle en deformations planes en utilisant la methode des elements finis
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Krňávek, Štěpán. "Optimalizace technologie lití pod tlakem odlitku vakuové pumpy." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231431.
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Diploma thesis deals with optimization of technological process casting a die cast, which is part of vacuum pump. The die cast is made from alloy AlSi9Cu3(Fe) in foundry KOVOLIT, a. s. There is a problem with inner defects at this cast. Solution of this thesis is to suggest suitable actions to minimize of incidence the defects in the cast. According to analysis of the defects in the cast these defects were classified as combination of shrinkages and gas holes. According to analysis causes of the defects are high temperature of die mould and closed air in die mould. As a result suitable actions were suggested – a change of the die mould tempering and a design adjustment of the cast. In case of implementing a new die mould in the manufacture a new gating system was designed. Suitability of the new gating system was assessed according to simulation of filling die cavity.
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Gresse, Adrien. "L'Art de la Voix : Caractériser l'information vocale dans un choix artistique." Thesis, Avignon, 2020. http://www.theses.fr/2020AVIG0236.
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Pour atteindre une audience internationale, les productions audiovisuelles (films, séries, jeux vidéo) doivent être traduites dans d'autres langues. Très souvent les voix de la langue d'origine de l'œuvre sont doublées par de nouvelles voix dans la langue cible. Le processus de casting vocal visant à choisir une voix (un acteur) en accord avec la voix originale et le personnage joué est réalisé manuellement par un directeur artistique (DA). Aujourd'hui, les DAs ont une inclination pour les nouveaux talents (moins coûteux et plus disponibles que les doubleurs expérimentés), mais ils ne peuvent pas réaliser une audition à grande échelle. Doter les industriels de l'audiovisuel d'outils automatiques capables de mesurer l'adéquation entre une voix dans une langue source avec un contexte donné et une voix dans une langue/culture cible est donc d'un fort intérêt. De plus, au-delà du casting vocal, cette problématique du choix d'une voix fait écho aux grands enjeux scientifiques de la compréhension des mécanismes de perception de la voix.Dans ce travail de thèse, nous utilisons des voix d'acteurs professionnels sélectionnées par un DA dans différentes langues pour des œuvres déjà doublées. Dans un premier temps, nous construisons un protocole fondé sur une méthode état-de-l'art en reconnaissance du locuteur pour mettre en évidence l'existence d'une information caractéristique du personnage dans nos données. Nous identifions également l'influence du biais linguistique sur les performances du système. Nous mettons en place, dans un second temps, un cadre méthodologique pour évaluer la capacité d'un système automatique à discriminer les paires de voix doublant un même personnage. Le système que nous avons créé repose sur des réseaux de neurones siamois. Dans ce cadre d'évaluation nous exerçons un contrôle fort des biais (contenu linguistique, genre, etc.) et nous apprenons une mesure de similarité permettant de prédire les choix du DA avec un écart significatif par rapport au hasard. Enfin, nous entraînons un espace de représentation mettant en avant l'information caractéristique du personnage, appelé p-vecteur. Nous montrons, grâce à notre cadre méthodologique que cette représentation permet de mieux discriminer les voix de nouveaux personnages, par comparaison à une représentation orientée sur l'information locuteur. De plus, nous montrons qu'il est possible de bénéficier de la connaissance généralisée d'un modèle appris sur un jeu de données proche en utilisant les techniques de distillation de la connaissance dans les réseaux de neurones.Cette thèse apporte un début de réponse pour la construction d'un outil d'aide au casting vocal capable de réaliser une présélection des voix pertinentes parmi un grand ensemble de voix disponibles dans une langue. Si nous avons montré dans cette thèse qu'il est possible d'extraire, à partir d'un grand volume de données, une information caractéristique d'un choix artistique souvent difficile à formaliser, il nous reste encore à mettre en évidence les facteurs explicatifs de cette décision. Nous souhaitons pouvoir fournir en complément de la sélection de voix réalisée une description des raisons de ce choix. Par ailleurs, la compréhension du processus de décision du système nous aiderait à définir la "palette vocale". À la suite de ces travaux, nous aimerions explorer l'influence de la langue et de la culture ciblée en étendant nos travaux à plus de langues. À plus long termes, ce travail pourrait aider à comprendre comment la perception des voix à évoluer depuis les débuts du doublage<br>To reach an international audience, audiovisual productions (films, TVshows, video games) must be translated into other languages. Generally, theoriginal voice is replaced by a new voice in the target language. This processis referred as dubbing. The voice casting process aimed at choosing avoice (an actor) in accordance with the original voice and the character, isperformed manually by an artistic director (AD). Today, ADs are looking fornew "talents" (less expensive and more available than experienced dubbers),but they cannot perform large-scale auditions. Automatic tools capable ofmeasuring the adequacy between a voice in a source language with a voicein a target language/culture and a given context is of great interest for audiovisualcompanies. In addition, beyond voice casting, this voice selectionproblematic echoes the major scientific questions of voice similarity andperception mechanism.In this work, we use the voices of professional actors selected by ADs indifferent languages from already dubbed works. First, we set up a protocolwith state-of-the-art methods in automatic speaker recognition to highlightthe existence of character/role specific information in our data. Wealso identify the influence of linguistic bias on the performance of the system.Then, we build methodological framework to evaluate the ability ofan automatic system to discriminate pairs of voices playing the same character.The system we created is based on Siamese Neural Networks. In thisevaluation protocol, we apply strong constraints to avoid possible biases(linguistic content, gender, etc.) and we learn a similarity measure that reflectsthe AD’s choices with a significant difference that is not attributed tochance. Finally, we train a new representational space highlighting the characterspecific information, called p-vector. Thanks to our methodologicalframework, we show that this representation allows to better discriminatethe voices of new characters, in comparison to a representation oriented onthe speaker information. In addition, we show that it is possible to benefitfrom the generalized knowledge of a model learned on a similar dataset using knowledge distillation in neural networks.This thesis gives a initial answer for assisted voice casting and providesautomatic tools capable of preselecting the relevant voices from a large setof voices in a target language. Despite the fact that the information characteristicof an artistic choice can be extracted from a large volume of data,even if this choice is difficult to formalize, we still have to highlight the explanatoryfactors of the decision of the system.We would like to explain, inaddition to the selection of voices, the reasons of this choice. Furthermore,understanding the decision process of the system would help us define the"voice palette". In future work, we would like to explore the influence of thetarget language and culture by extending our work to more languages. Inthe longer term, this work could help to understand how voice perceptionhas evolved since the beginning of dubbing
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Šmatelka, Jakub. "Optimalizace technologie voskových modelů ve firmě Alucast." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231529.
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This diploma thesis deals with the problem of wax patterns manufacturing in investment casting technology (lost wax process). This technology is very sensitive to the exact execution in each phase of the whole process, from concept design up to the final casting expedition. During most operations, dimensional changes occur, which is affecting the accuracy of the final casting. No matter how big these changes are, but especially if they occur with the least variance. One of the first phases in this technology is making wax patterns. There are several ways of making the wax patterns and this thesis is describing two different methods used in the Alucast foundry. One is based on using “soft waxes” enabling using low pressure machines, the other one on the “hard waxes” where the injection machine with higher presses is being used (SOM). These two above mentioned technologies are compared in this work.
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Kutílek, Tomáš. "Konstrukce stavu pro kontrolu odlitku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228648.
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This thesis is focused on construction of device for inpection of final casting for machine casting dedicated for tension of car cam belt. Device for inpection of final casting is operated by pneumatic parts and is intended to check operational parts of the machine casting. Control is designed directly to enterprise production. It is constructed according to the custom requirements and it’s operability was confirmed on a prototype. It’s construction solves the problems with manual checking. General analysis of machine cast checking as well as analysis of machine casting dedicated for tension of car cam belt in the submitting company is included in the thesis. Moreover, the thesis comprises of discussion of the construction itself, discussion of pneumatic operating elements and economical and technological review.
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Kachyňa, Stanislav. "Návrh výrobní technologie součásti obráběcího stroje." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229221.
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This thesis deals with design for manufacturing technology single part on machine FS, which is the connecting part. Work deals with the material of this component, therefore, cast iron with lamellar graphite, the properties of this material, primarily focusing on the machinability. Due to the shape and dimensions of the workpiece is also described problems cutting of box parts, the most common operations used in their manufacture, including cutting tools and materials. These findings are then applied in terms of the company TOS Kuřim - OS a.s. An analysis of current manufacturing technology and design is made for its amendment. In conclusion with the technical-economic evaluation.
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Dooley, Gavin. "Shell improvements for the investment casting of orthopaedic implants." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7273/.
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This project focuses on understanding and improving the technology used in the ceramic processing of the investment casting of orthopaedic implants. The shell making process is a time consuming and costly stage of the Investment casting process. This work reviews the use of a super absorbent polymer as a means to decrease lead time within the shell room and improve capacity. The technology allowed a typical shell which had 2 hours dry time to be reduced by 75% to 30 minutes between coats. Following initial analysis, a greater understanding on the flaws of the Rapid Shell system was sought. Work was also conducted to improve and understand the parameters which affect a generic shell system. Changes to the raw material were reviewed by changing the particle size of stucco and flour materials to improve strength. Different processing methods were also analysed to gain a better understanding into the fundamentals of ceramic processing. The use of rainfall and fluid bed stucco applications were analysed within a DOE experiment to better understand the effect of changes in microstructure affecting the overall performance of the shell. The results showed the microstructure varied greatly between processing method which in turn affected the thickness and strength of the respective shell systems. Rainfall sanded shells exhibited a thinner stucco layer while the flexural strength was 20% higher than fluid bed shells.
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Kavanagh, Alan. "Study of improved casting methods for the manufacture of medical grade cobalt alloy." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7488/.
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Within many foundries, poor mould design and casting methods result in high levels of process variability, poor metal yield, scrap and inefficiencies leading to overall sub-optimal performance. The aim of this project was to try to try to address main problem areas through an alternate casting method (1-tree casting) used for the manufacture of ASTM F-75 cobalt chrome (Co-Cr) biomedical castings. The mould filling of various runner systems was assessed using real-time X-ray imaging and computational modelling. Mechanical testing, CT-scanning and metallurgical inspection of as-cast and heat-treated test bars produced in industrial trials at the DePuy foundry were performed. Direct thermocouple measurements, thermal imaging and microstructure measurements examined the effect of casting method on solidification time and cooling rates. Numerical modelling using ProCAST casting simulation software was performed. A statistical improvement in the as-cast tensile strength was observed with the 1-tree casting method compared to the established casting method. CT analysis indicated the presence of discrete gas porosity in some specimens which was attributed to high levels of air entrainment during pouring. The occurrence rate and morphology of the observed pores is described. Post heat-treatment the differences in the as-cast mechanical properties were eliminated with no evidence of casting method observed. However elongation to fracture results in both the as-cast and heat-treated conditions were lower than expected, and pose a challenge regardless of casting method. The 1-tree casting method reduced variation in alloy cooling rates and solidification times versus the established process.
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Kehoe, A. "Detection and evaluation of defects in industrial images." Thesis, University of Surrey, 1990. http://epubs.surrey.ac.uk/804357/.
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Treurnicht, N. F. "High speed cutting and electric discharge machining as complementary processes in the die and mould industry." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53448.
Full textAbstract:
Thesis (MScEng) -- Stellenbosch University, 2003.<br>ENGLISH ABSTRACT: High Speed Cutting (HSC), specifically milling is a significant contemporary development in
machining. The Die and Mould industry is experiencing a difficult business climate. There
is competitive pressure for shorter lead times and lower prices. Companies worldwide, are
under financial pressure, to meet the challenges of a globalised business environment.
The conventional position of milling and Electric Discharge Machining (EDM / Erosion) is
discussed with the proposal to use HSC and EDM as complementary processes. Among
new developments the progress in computer infrastructure is prominent. There is also a
paradigm shift that should be made from experience based process planning to modern, up
to date knowledge based process planning. High Speed Cutting is now a mature process
capable of acceptable process security. The examples detailed include crankshaft-forging
tooling, injection moulding tooling and powder sintering tooling. A process chain is proposed
for the complementary HSC / EDM process with estimated illustrative time saving over the
conventional EDM dominated process. HSC will be the first process removing the bulk of
the material, finishing as far as possible and with EDM finally machining the features that will
be difficult or impossible with HSC.
To facilitate the use of the complementary processes a decision model to determine the
crossover point between HSC and EDM is proposed. The decision model is firstly
presented as a flow diagram to determine whether the task is a candidate for HSC only, EDM
only, or the complementary HSC / EDM process. The key parameters e.g tool H d ratio are
variables. This is in order that the flow diagram may be adapted to a specific machine tool
infrastructure and expertise level in a company. The second part is a HSC machining time
estimation model. The time is estimated per segment roughed, semi-finished, or finish
machined. The model is in an empirical form with constants that can be adapted to the
practices of a specific company. It is intended that the constants also be periodically revised
to reflect the development in HSC expertise that will occur during the use HSC in the
company. The model is practically evaluated with a case study, including the detail steps,
not included in the model. Conceptual guidelines are given for software implementation.
It is concluded that HSC and EDM are suitable complementary processes. It is a necessary
prerequisite to use pallets to avoid multiple set-ups. Complementary HSC and EDM is
especially appropriate for the gradual deployment and skill development for HSC. HSC and
complementary HSC / EDM is considered the opportunity for companies to make a major
breakthrough in lead time and operating expense if the necessary pallet/fixturing equipment,
CAx infrastructure and human capability is available.<br>AFRIKAANSE OPSOMMING: Hoe Spoed Masjinering (HSC), spesifiek frees is ‘n betekenisvolle ontwikkeling in
masjinering. Die Gereedskap en Gietvorm bedryf ervaar ‘n moelike besigheidsklimaat.
Daar is kompeterende druk vir korter lewertye en laer pryse. Maatskappye wereldwyd is
onder finansiele druk om in die geglobaliseerde besigheidsmilieu te presteer.
Die posisie van frees en Elektriese Ontladingsmasjinering (EDM / Vonkerosie) word
bespreek met die voorstel om HSC en EDM as komplementere prosesse te gebruik. Onder
die nuwe ontwikkelings is daar prominente vooruitgang in rekenaarinfrastruktuur. Daar is
ook ‘n paradigmaverskuiwing nodig van ondervinding gebaseerde na op datum kennis
gebaseerde proses beplanning. HSC is nou ‘n ontwikkelde proses met voldoende
prosessekerheid. Die voorbeelde sluit krukas smee gereedskap, inspuitgiet gereedskap, en
poeier-sinter persgereedskap in. ‘n Prosesketting word voorgestel vir die komplementere
HSC / EDM proses met ‘n beraamde illustratiewe tydbesparing oor die konvensionele EDM
gedomineerde proses. HSC sal die eerste proses wees wat die meerderheid van die
materiaal verwyder en oppervlaktes so ver as moontlik afwerk, met EDM wat die finale
afwerking doen en ook die masjinering wat vir moeilik haalbaar of onmoontlik is vir HSC.
Om die gebruik van die komplementere prosesse te fasiliteer, word ‘n beluitnemingsmodel vir
die oorgangspunt tussen HSC en EDM voorgestel. Dit word eerstens as vloeidiagram
gebruik om die taak te klassifiseer vir HSC alleen, EDM alleen of vir komplementere HSC en
EDM. Die sleutelparameters, bv die beitel 116 verhouding, is veranderlikes. Dit is sodat
die vloeidiagram aangepas kan word by ‘n spesifieke masjienvermoe en ‘n kundigheidsvlak
in ‘n maatskappy. Die tweede deel is ‘n HSC masjineringstyd model. Die tyd word beraam
per segment uitgerof, afgewerk, of finaal afgewerk. Die model is in empiriese vorm met
konstantes wat kan aangepas word by die praktyke van ‘n firma. Dit is die bedoeling dat die
konstantes periodiek aangepas word om die ontwikkeling te weerspieel wat in die
maatskappy plaasvind. Die model word prakties evalueer met ‘n gevallestudie, insluitend
die detailstappe, wat nie in die modelformulering ingesluit is nie. Konseptuele riglyne word
gegee vir programmatuur implementering.
Die gevolgtrekking word gemaak dat HSC en EDM geskikte komplementere prosesse is.
Dit is ‘n voorvereiste om pallette te gebruik om veelvuldige opstellings te vermy.
Komplementere HSC / EDM is veral toepaslik om HSC geleidelik in ‘n firma te ontplooi en
kundigheid te bou. Die HSC / EDM kombinasie word ook die geleentheid geag vir firmas om
‘n deurbraak te maak in lewertyd en bedryfsuitgawes as die nodige pallettoerusting, CAx
infrastruktuur en menslike vermoe beskikbaar is.
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Vyškovský, Stanislav. "Technologie výroby základny přístroje z plastu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229142.
Full textAbstract:
Thermoplastic injection technology is widely used in all sectors of consumer electronics and automotive industry. The biggest advantage of this manufacturing technology is a high degree of automatization and good reproducibility of the manufacturing process. Another advantage is the possibility of recycling of the gating scrap and defective products. The main task of this work is to calculate the necessary parameters for the injection process, which takes place at the designed injection form. Next part is technical design which includes choice of standard parts of injection mold and idividual semi-finished parts for mold. Thesis continues with selecting the type of injection press based on calculated parameters of the injection process. Thesis is finished by technical-economic evaluation.
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Štipl, Pavel. "Technologie lití vysokotlakých odlitků a vlivy působící na jejich kvalitu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231432.
Full textAbstract:
This diploma thesis deals with the technology of high pressure die casting and especially influences having effect on their final quality. The aim of this thesis is to design the measures to convert casting of the cylinder for chainsaw into the serial production. The thesis contains a description of the production of castings by technology of high pressure die casting, theoretical analysis of the factors with effects on their final quality and practical description of the conversion casting of cylinder for chainsaw into the serial production. The problem of converting to serial production has been solved by several samplings and final test series. Part of each sampling is analysis of defects and design of measures leading to elimination or at least minimization of such defects. On the basis of the production process has been successfully optimized and casting of the cylinder for chainsaw was successfully converted into the serial production. The results of this work also allowed for a smooth conversion into the serial production of another type of cylinder, manufactured by company MOTOR JIKOV.
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Kohout, Jiří. "Příprava a organizace výstavby bytových domů Rozhledna v Chrudimi." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-372301.
Full textAbstract:
The content of the diploma thesis is a building-technological project of the new building of residential buildings Rozhledna in Chrudim. The thesis contains technological regulations for a rough bottom structure and a rough top structure. Technological regulations are complemented by design of machine assembly, site facilities and control and test plans. Work safety, construction risk assessment, time schedule of main objects, object time and financial plan and budget of main buildings are also solved. An important part is the comparison of the parallel, gradual, current construction and the design of the thermal insulation system of the curtain wall.
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Křivohlávková, Lucie. "Příprava realizace bytového domu v Lanškrouně." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-391946.
Full textAbstract:
The content of the diploma thesis is a building-technological project of the new building of residential building Lanškroun. The thesis contains technological regulations for a rough bottom structure and a rough top structure. Technological regulation are complemented by design of machine assembly, site facilities and control and test plans. Work safety, construction risk assessment, time schedule of main object, object time and financial plan and budget of main building are also solved. An important part is the economic comparison of tower crane and mobile crane and green facade.
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Honnorat, Julien. "L'esthétique fonctionnelle de l'appareillage informatique comme ancrage phénoménologique de l'oeuvre à l'époque des immatériaux." Thesis, Aix-Marseille 1, 2011. http://www.theses.fr/2011AIX10035/document.
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Nous ne sommes plus à l’âge où les destructions poétiques d’appareils se voient car les régimes d’appareils sont devenus transparents : lorsque nous pressons un écran tactile, nous touchons ce que nous ne voyons plus, nos empreintes, et nous voyons ce que nous ne toucherons jamais, le plan numérique. Pour l’artiste contemporain, l’interface haptique – point d’orgue d’une technologie stéréotypée de la percussion – est le parergon d’une échelle inédite, toute tactile. De la machine à écrire aux claviers de plus en plus fins du design informatique, à mesure que l’on croit voir le bloc imaginaire céder sous la pression ergonomique de l’empire cybernétique, se palpe en fait un réel d’emblée en dehors des formes et à l’intérieur de notre doigté. C’est l’espace de la corne aux doigts. Ce transfert, cette remontée du point d’impact dans son élan, ce retour de la forme dans sa structure font du moment de touche – de l’appareillage comme manœuvre de départ – un isolat capital pour reposer la question de la sculpture à l’époque des immatériaux. Bien en face et à contre-courant de la surface informatique, une épaisseur sensible fonctionnelle aurait lieu et pourrait donc faire œuvre ; telle est la thèse proposée ici. Le comportement machinal de l’utilisateur d’interfaces sera considéré comme un modèle poïétique ou pensé comme une partie de l’imagination en attente de traduction plastique. Pendant que se joue l’expérience rythmique de l’interactivité, le corps ne doit-il pas fournir un effort perceptif pour ne pas s’absenter dans une partition photo-digitale jouée par avance ? Ne doit-il pas exprimer son ancrage particulier, calleux et bruissant – nous l’appellerons dactylo-phonique – au contact de la matière du monde ? Sans cette expression, jamais le design technologique contemporain, bi ou tridimensionnel, modélisé et assisté par ordinateur, n’entamera de rapport véritablement efficient avec le réel de nos habitudes et de nos démarches ; bref avec tout le poids incarné de notre conscience imageante : la perte d’indicialité instaurerait-elle un type introverti de phénoménalité ?<br>Poetic destructions of apparatus are no longer visible as regimes of apparatus have become transparent: when we press a tactile screen, we touch what we cannot see anymore – our fingerprints – and we see what we will never be able to touch – the digital space. For contemporary artists, haptic interfaces are the finger-tipping point of a technological dynamics of percussion but also the parergon of a new and entirely tactile scale. From the first typewriters to the latest ultra thin keyboards designed by computer manufacturers, we may think imagination is yielding under the ergonomic pressure of the cybernetic world. But in fact, existing outside of the shapes and right under our fingertips lies a palpable reality – the space of calluses. This transfer, this sensory feedback, this return of the form to its structure turns this casting off of the apparatus into an essential isolate to rethink sculpture in the age of immateriality. Right in front of the computer surface but working against it, there would be a functional sensitive thickness – an art-making place. This is our thesis. The machine-like behaviour of the interface user will be considered as a poietic model or regarded as a part of imagination waiting for plastic translation.We may wonder whether the rhythmic experience of interactivity does not entail a perceptual bodily effort on our side in order not to remain absent during the performance of a somewhat predictable photo-digital score.Doesn't this peculiar, callous and rustling – or dactylo-phonic – anchoring of the body to the substance of the world need to express itself? Without this expression, contemporary technological design — whether bi or tri-dimensional, modeled or computer-assisted — will never initiate a truly efficient relation with the real experience of our habits and actions, i.e. with all the embodied strength of our image-making consciousness: does the loss of indiciality create an introverted type of phenomenality ?
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CHUANG, TSUNG-TA, and 莊宗達. "Revamping Torch Cutting Machine Electrical Control System of Continous Casting Machine." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/aw5zf6.
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Huang, Chun-Chen, and 黃俊誠. "Effect on casting of conventional dental alloys by new type magnesia investment and argon-vacuum casting machine." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/ga7g2c.
Full textAbstract:
碩士<br>高雄醫學大學<br>牙醫學研究所<br>91<br>The dental alloys, casting machines and investments have much improvement in these recent years, especially for casting of pure titanium. New type casting machine designed for pure titanium casting can reduce the oxidation layer when casting. Either entirely new systems or modification of the investments have been needed for the casting of pure titanium. We have been confirmed that MgO with 5% ZrO2 can increase the thermal expansion value and fitness of titanium casting. When using these new investments, the oxidation between molten titanium and investments can be reduced. The purposes of this investigation would want to improve the casting properties by replacement of the traditional casting technique and material by using new casting machine and new investment. In this investigation, we used 2 investments and 2 casting machines and repeated casting 3 generations, totally 12 groups. Each group has 3 samples.
The results were described as follows: The total expansion of cristobalite base investment was 1.23%. The expansion value of cristobalite base investment was less than that of MgO base investment 1.62%. The castability was up to 100% in all groups. It means that, new type casting machine and new type MgO investment were suitable for conventional dental alloy casting. The repeated casting and casting machines show no significant difference between marginal gap. It shows a significant difference between marginal gap and investments. (P<0.05) The marginal gaps of MgO base investment were better than cristobalite investment. It means that, new type casting machine has ability to replace traditional casting machine. There is no significant different between surface roughness and repeated casting. Casting machines and investments show significant differences between surface roughness. (p<0.05) New type casting and cristobalite investment can provide batter surface roughness. The composition of alloy measuring by EPMA shows no significant difference with casting machines. The weigh percentage of Au shows negative correlation with marginal gap. The more of Au, the less of marginal gap. The oxidation layers of casting casted by argon vacuum-pressure casting machine were thinner than that casted by traditional centrifugal casting machine. The hardness of casting show significant difference with two investments, the VHN of cristobalite is higher than MgO investment. The hardness of castings are also show significant difference with each generations of repeat casting. The VHN of 100 % as-received alloy are significant higher than other groups. Hence, we concluded the casting machines and investments can affect the outcome of marginal gap and surface roughness of casting. The new type of casting machine and new investment can improve the marginal fitness and surface roughness of casting by traditional dental alloy.
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Chen, Yung-Chien, and 陳永介. "Research on PC-Based Monitoring System for the Die-Casting Machine." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/00508234491349925856.
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碩士<br>崑山科技大學<br>機械工程研究所<br>102<br>In Taiwan, the manufacturing industry is energetic and export-oriented mainly. There are many components produced by using die casting in the automotive and motorcycle. The die-casting machine is the one kind of equipments for producing the die-casting components, and its peripherals including ladle, sprayer, and extractor.
This paper studies the die-casting machine equips with a PC-Based computer used for monitoring purposes. PLC controls the die-casting machine and its peripherals’ motions, and PC-Based LabVIEW program controls the injection speed. PC-Based computer measures the servo valve’s response time in the injection hydraulic system, and monitor the displacement, speed, and pressures of the injection system. Comparing the results of the PLC-Based and PC-Based injection speed control shows the PC-Based control can maintain injection speed better. The man-machine interface and the measuring program are written by using LabVIEW Graphic Programming software. The injection mode is set as multi-stage speed.
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Shi, Pei-Zhe, and 施培哲. "A Research of Pneumatic Bait-casting Machine for Long-line Fishing Vessels." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/16343369900719310017.
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碩士<br>國立彰化師範大學<br>工業教育學系<br>85<br>Abstract The newly developed pneumatic-type bait-casting
machine is presented in this research. The advantages of this
new machine are to improve the efficiency and to cut down the
cost of operation of the ocean long-line fishing vessel which is
usually operated manually. In addition , the machine can
prevent the large amount of death of sea-birds due to their
catching baits. Most of all, the machine is much less expensive
than the current imported hydraulic or mechanical type machine.
This thesis includes three parts : First, theories of bait-
casting machine are summarized and applied to its design and
practical construction, which consists of an electrical
controller, a pneumatic system and a baited launcher. Secondly,
some characteristics of the present developed bait-casting
machine have been investigated and analyzed by sea trials,
including the effects of torque and speed due to the motor
responses via the tank supplied pressure. Finally, an optimal
design is obtained according to the comparison between
experimental data and computer simulation.
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Lin, Ming-Horng, and 林銘弘. "Optimal Parameter Design of Aluminum Alloy Die-Casting Frame for Sewing Machine." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/05524514396467592442.
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碩士<br>朝陽科技大學<br>數位化產品設計產業研發研究所<br>96<br>Abstract
It has been more than a century since the first sewing machine was presented to the public. The technology of alloy die-casting process is improving constantly. The material of frame, main structure of sewing machine, was evolved from cast iron into aluminum alloy die-casting. Owing to the universal environmental consciousness, how to make efficiency use of limited resources and reduce the pollution and negative effect have become the most concern points for the up-to-date product research and development to reduce the production cost and increase the enterprise profit at the same time.
The main function and purpose of frame is to fix the spare parts position of sewing machine. When the machine is activated and taken the external force, all the spare parts should be remained steady. Because the structure and rigidity of the frame will cause the crucial influence of failure mode and stability of stitches formation, the article adopted Taguchi Method to find out the most sensitive design parameters of the frame’s structure strength during the optimization process. After the proof of the test and verify experiment, taking the Taguchi optimal experiment factors as basis, in accordance with the increment ratio of control factors to the weight lessen and deformation, to continue the second period of optimization.
In the end, making a CNC prototype for the optimal digital model which was generated by the computer simulation analysis, and then proceeding the substance experiment and measurement to verify the correctness of experiment plan and computer simulation analysis. After the comparison, the outcome of substance experiment and computer simulation analysis closely meet, and the variation is less than 2%. This study successfully lessened the weight of aluminum alloy usage and look after the sewing quality simultaneously.
Key words：sewing machine , frame , optimization
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Yeh, Chin-Tzu, and 葉津孜. "Effect on recasting of palladium-silver porcelain alloy by vacuum-pressure casting machine." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/14734490388733502891.
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碩士<br>高雄醫學大學<br>牙醫學研究所碩士班<br>94<br>Objective : Palladium-silver alloys were important porcelain bonding alloys. The purpose of this investigation was to determine the effect on recasting of palladium-silver porcelain alloy by vacuum-pressure casting machine.
Materials & Methods : The casting alloy was Jelstar (J.F.Jelenko., USA) and the phosphate-bonded investment Fujivest II(G.C., USA) was used. The castings were performed in the vacuum-pressure casting machine (Castmatic-S, Japan) and the traditional centrifugal casting machine (Kerr, USA). The initial casting was completed with a totally new alloy. Part of surplus (sprue and button ) alloy removed from the previous casting was weighed, and combined with appreciate new alloy to achieve 50 % weigh ratio for the next casting. The sequence was repeated through three generation. In the study, we used 2 casting machines and repeated casting 4 generation, totally 8 groups. Each group has 3 samples. The marginal fitness of castings was compared by 3D coordinate measuring machine. XRD analyzed the composition of castings. The level of chemical reactivity was evaluated by EPMA. The level of hardness was measuring by microhardness tester. The surface roughness of castings was measuring by surface roughness tester. These values were analyzed with two-way ANOVA, p <0.05.
Results : The castability was reach 100% in all groups. The group casting by vacuum-pressure casting machine with new alloy has least marginal gap (31.1±9.7μm). The group casting by traditional centrifugal casting machine with the alloy of forth generation has largest marginal gap (68.5±18.0μm). The repeated casting by vacuum-pressure casting machine showed better result in the aspect of marginal gap. XRD analysis of all samples showed the main components were Pd and Ag. The composition of alloy measuring by EPMA showed no significant differences between repeated castings and casting machines(p>0.05). In and Sn were not lost in vacuum-pressure casting pattern. The thickness of oxidation layer of the group casting by vacuum-pressure casting machine with new alloy was thinnest(1.15±0.18μm). The thickness of oxidation layer of the group casting by traditional centrifugal casting machine with the alloy of forth generation was thickest (2.13±0.47μm). The thickness of oxidation layer of castings by traditional centrifugal casting machine were thicker, and increased through each generation. The group casting by traditional centrifugal casting machine with new alloy has largest VHN(179.6±1.7). The group casting by vacuum-pressure casting machine with the alloy of forth generation has smallest VHN (166.2± 1.4). The hardness of castings by traditional centrifugal casting machine were higher. The group casting by vacuum-pressure casting machine with new alloy has least surface roughness(1.15±0.18μm). The group casting by vacuum-pressure casting machine with the alloy of second generation has largest surface roughness (2.13±0.47μm). The repeated casting and casting machine showed significant differences between surface roughness (p<0.05).
Conclusion : The casting machine and repeated casting can effect the outcome of marginal gap, surface roughness and hardness. The automatic casting system of vacuum-pressure vesting machine can provide a safety casting procedure, also can improve the properties of casting. Further investigation is required to determine the alternation of oxidation layer.
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Su, Wei-Kai, and 蘇煒凱. "Research on Full Closed-Loop Injection Control System for the Die-Casting Machine." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/74398508952390237486.
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Sung, Chia-Chen, and 宋家辰. "Study on Control System of Deburring Machine for Aluminum Alloy Metal Die Casting Sample." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/29nv4r.
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碩士<br>遠東科技大學<br>電機工程研究所<br>101<br>Owing to the development of the global high-tech and computer industry, not only traditional industry also labor intensive instead of technical management. Fast and accurate automation equipment reduces risk and save the cost.
The servo control technology is the main of part in the automation industry . It could be widely used in industry, science, medical and military. Because of that, the design focus on the accuracy and speed.
The research is used for servo control system by YASKAWA. There are five servo motor and driver in the system and testing best in the hood of the motor by deburring machine for aluminum alloy metal die casting sample.
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Chang, Kuei-Chi, and 張桂綺. "A Web-based Fault Diagnostic Expert System by Semantic Web – Take the Die Casting Machine as an Example." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/41381839445956865187.
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碩士<br>雲林科技大學<br>資訊管理系碩士班<br>96<br>As the improvement of the manufacturing technology and the requirement for the function of the market increasing, the structure of the technological machinery will also become more complicated and professional. Machinery is usually designed to make up by a large number of parts, and each different spare part is connecting to each other. If there is a certain spare part was damaged, it might cause a chain reaction, mechanical fracture, explosion or burning etc. However, if the manual operation works improperly that might cause mechanical fault, disorders, and risk the public’s safety. Furthermore, the improper manual operation may also let the enterprises of the development lead to economic losses or cause other unpredictable losses. To demand a smoothly normal operation, then, a talented man with adequately professional knowledge is certainly needed. When the machinery breaks down, the person should be seasonable enough to process a necessary guidance for solving the problems immediately, improve the reliability、guarantee the safety and the availability of the mechanical operation. Most importantly, the losses that cause from the fault may lead to the least.
“Building” constructs an Expert System with a web-based function. Through the information management of the ontology, to classify the symptom and the reasons of the fault is by combining and making the use of mechanical organization. When the fault symptom occurs, the Expert System can be very accurate, and its will figure out the causes of the fault swiftly. Then, match the construction of the Semantic Web, search the fault diagnosis through the computer. Through out the whole process, it will improve the operational function of the machinery, and will make the mechanical life lengthen and improve its value, too.
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Chandra, Sanjay. "Heat transfer, oil lubrication and mould tapers in steel billets casting machines." Thesis, 1992. http://hdl.handle.net/2429/2926.
Full textAbstract:
This study examines in detail the factors that influence mould-billet interaction and heat
transfer during the continuous casting of steel billets. In an extensive three-year project, major
industrial trials were held in three Canadian steel plants involving in each case an operating mould
instrumented with arrays of thermocouples to record mould wall and mould cooling water tem
peratures. Additionally, load cells were installed between the mould housing and the oscillator table
to record mould-billet interaction. Linear variable displacement transducers were attached to the
mould wall in order to monitor mould displacement. Measurements were made under different
casting conditions - steel grades, types and flow rates of lubricating oils and mould tapers - and
were recorded on a computer controlled data acquisition system. The liquid steel surface in the
mould was also filmed during casting.
Two existing mathematical models of the mould were modified and used to calculate the
axial heat flux profiles and the dynamic distortion of the mould during service. A two-dimensional,
finite-difference, heat-flow, mathematical model of the billet was developed to simulate solidifi
cation and shrinkage as a function of axial position in the mould. The coefficient of thermal con
traction of steel was estimated as a function of steel carbon content and temperature from
experimental data in the literature Ofl the lattice parameter of and ‘ unit cells; this was particularly
important to model the shrinkage of low-carbon steels. It has been shown that in theory, the low
carbon steels (C <0.15%) should experience the largest contraction due to δ- γ phase transformation;
but in practice, they shrink less because heat transfer to the mould is low compared to higher carbon
grades. A computer programme was developed to analyse the load cell response as a function of
mould displacement. Finally billet samples collected during the trials were metallographically
examined to study the different aspects of the solidification in the mould e.g., cracks, oscillation
mark depth and rhomboidity.
The most important result of the research work has been the finding that the heat transfer in
the mould is significantly influenced by the taper of the mould wall in the meniscus region. A high
initial taper (2.5-3.0%/m) in the meniscus region can compensate for the outward bulging of the
mould wall during operation preventing it from acquiring a negative taper. This absence of negative
taper has been shown to decrease mould-billet interaction during the negative strip period thereby
leading to a decrease in the heat extracted in the meniscus region. This finding has been corroborated
by an analysis of the load cell signals. It has been shown unambiguously that, for high mould heat
transfer, a shallow initial taper of the mould, that permits the wall to acquire a bulged shape, is
required. High heat transfer in the mould is likely to result in adverse lubrication condition for
casting high-carbon steel billets.
Filming of the steel surface has shown that only some of the lubricating oil flowing down the
mould wall reaches below the meniscus while the remainder collects on the liquid steel surface and
burns. As a result an increase in the flow rate of the oil is not reflected in a commensurate increase
in lubrication or heat transfer. In fact the industrial trials have clearly revealed that the existing flow
rate of oil at all three plants could be reduced at least by half without any visible deleterious effect
on billet quality.
It has also been possible to link various sensor signals to the generation of defects in the billet,
in particular to the formation of off-corner internal cracks, transverse depressions and billet
rhomboidity. This together with the linkages between mould heat transfer and operating variables
now makes it possible to conceive of a control system consisting of an instrumented mould and an
expert system that not only can asses billet quality on-line but can also initiate corrective action by
changing operating conditions that alter the heat transfer in the mould.
36
Shin, Yung-Yao, and 施詠堯. "The Study of Spray Forming and Continuously casting 6063 Aluminium Alloy: Microstructure, Machines and Forming Feature." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/17957706920112212500.
Full textAbstract:
碩士<br>國立成功大學<br>材料科學及工程學系碩博士班<br>91<br>In order to improve the properties of casting and mechanism behavior, Mg and Si elements had be added into aluminum. The intermetallic compound Mg2Si can improve the properties of casting, anti-corrosion and strength of alloys. By decrease initial grain size of 6063 aluminum to improve the formability of 6063 Aluminum alloy, we choice the spray forming process (SFP). Spray forming process is a faster cooling rate process, and precipitation are fine and homogenerous distribution.
The precipitate distributed homogeneously in spray forming process and to banish macrosegregation phenomenon; on the other hand, in continuously casting process (CCP), the precipitate was found at grain boundary and had apparent segregation phenomenon. In aging test, both processes had maximum hardness values at 150℃, 16 hours and 200℃, 8 hours. In hot compression test, when temperature increased or strain rate decreased, yield strength decreased. In tension test, when temperature decreased or strain rate increased, Yield strength and ultra tensile strength increased. When temperature increased and strain rate decreased, elongation and reduction of area increased. In superplastic test, both processes had larger elongation at 400℃than at 450℃, and hade maximum strain rate sensitivity (m) at 400℃.
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Rankapola, M. E. "The use of pod casting revision lectures in improving learners' academic performance." Thesis, 2014. http://hdl.handle.net/10352/329.
Full textAbstract:
M. Tech. (Information Technology, Faculty of Applied and Computer Sciences) Vaal University of Technology<br>The majority of research studies completed on podcasting technology focused on the acceptance of podcasting technology in the educational settings and the challenges that it poses for higher education institutions and instructors. Very little interest has been accorded to the effect that podcasting could have on the learners‟ academic performance. Utilizing a quasi-experimental non-equivalent group posttest, a wide used research method in the education discipline, the relationship between podcasting technology and academic performance, is investigated. The quasi-experimental was performed based on data collected over a period of 12 months, in which a non-random sample of 150 learners was taken from a population group of 350 management and entrepreneurship undergraduate learners at the Tshwane University of Technology. The sample was separated into two groups, namely the experimental group of 75 students, and the control group of 75 students. Both groups were offered the same subject by the same instructor. Control group learners are learners who have already completed the subject in the first semester before the podcasting technology was introduced in the subject. The experimental group learners are learners who have completed the subject through the support of podcasting technology. The assessment marks for four formal tests of the two groups were compared by means of a t-test to determine the effect of the intervention. The outcomes of the study showed an increase in the overall mean score of the experimental group in comparison to the mean score of the control group. The number of students obtaining distinctions also increased, compared to the control group. These considerations possibly indicate a positive relationship between the availability of podcast lectures and academic performance.
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wan-hsun, lin, and 林琬恂. "Application of multivariate control chart and diagnosis method---A case of precise casting machinery parts." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/75625697399614150290.
Full textAbstract:
碩士<br>致遠管理學院<br>工業管理學系研究所<br>98<br>Control chart is one of the most important tools to improve the quality of products. The traditional control method mainly contains Shewhart, CUSUM--- Cumulative Sum, EWMA--- Exponentially Weighted Moving Average. These traditional control charts examined the quality and the characteristics of certain products, which is the SPC. However, the quality of the products and the variable process are interrelated. One disadvantages of the traditional control chart is that it considers the quality as an individual variable. As a result, it will lose a lot of relative messages. Therefore, using the Singlevariate Control chart is easy to make mistakes. Multivariate Control chart is derived from this problem. It supervises the multiple qualities simultaneously and takes the associated variables into consideration. This control is called the Multivariate Statistical Process Control。
Hotelling’s T2 Multivariate Control chart provides multivariate a comprehensive calculation at the same time. When certain information exceeds the boundary of control, which is unusual, we should examine the abnormal variable. In other words, we should reduce this unusual comprehensive information and diagnose which variable causes the integral abnormal. The MYT is generally used (Mason, Young and Tracy). This method reduces the exceeded information and offers another result. The other mainly used method is PCA(Principal Component Analysis), it provides the same functions and result as well.
This paper takes Dental Lost-Wax Casting technique as an example, probing the delicate cast of wax quality with Hotelling’s T2 , to find the abnormal numbers and to use MYT to do the numerical analysis. Through the process of diagnosing the variables which may cause the abnormal numbers, it would help to find the solution for the case. On the other hand, by comparing the benefits between PCA and MYT, we hope to see the continuous improvement in the quality of the delicate cast, and to enhance its competitiveness in the market.