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Tišnovský, Jakub. "Návrh a výroba vakuové formy pro sériové tváření plastů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-402538.
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This diploma thesis deals with the proposal and production of a mold for series production of plastic parts by vacuum forming. The thesis is divided into 2 main chapters. The theoretical part includes analysis of chip machining technology. The experimental part focuses on solving the design of the mold in PowerShape software, a detailed analysis of making of the model for casting and about making of the mold themselves. In the last part the manual completion and verification of the mold is discussed. Thesis is terminated by technical-economic evaluation, in which is discussed about production costs.
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Hejl, Dušan. "Technologie výroby plastového kontejneru na náboje." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229140.
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Dissertation deals with solution of production of set component „plastic porter for ammunition“. Component is made from high-density polyethylene with business marking LITEN ML 77, suggested series of 3 000 000 pieces. On the basis of literary study of plastics injection problems and necessary calculations, there was proposed injection form. This form is solved by means of normalised components from company Meusburger. There was chosen injection machine from company Arburg Allrounger 370 S 700 – 170.
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Ponka, Ondřej. "Návrh výrobní technologie vakuové lisovací formy." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382271.
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The master thesis deals with the design and production of the mold for vacuum forming. Specifically, how the existing and new mold materials affect their design and, consequently, their production technology. The thesis contains a brief description of the principle of vacuum molding. Technological and design principles of designing molds. Furthermore, the realization of the solution variants and the simulation of their production. The solved variants are subsequently evaluated from a technical and economic point of view.
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Hollands, Lisa. "The glass-to metal interface during container forming processes." Thesis, University of Sheffield, 1998. http://etheses.whiterose.ac.uk/2984/.
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It is known that a newly formed glass container will only possess a very small fraction of its theoretical strength. This suggests that damage occurs on the surface of the glass melt during the forming process due to glass to mould contact and hot glass handling. It might be expected that any damage inflicted on the surface of a glass article during manufacture would heal at the elevated manufacturing temperatures used, however this does not appear to be true. Therefore, the actual mechanism by which glass strength is reduced during forming needs to be fully understood and the work presented in this thesis addresses this problem. Experiments, therefore, have been carried out here which simulate the formation of glass articles using an experimental pressing rig by systematically altering processing parameters such as the mould material, surface fmish of the mould, pressing temperature and atmosphere. Processing parameters that are used industrially for the formation of glass containers were generally reproduced wherever possible in order to investigate the glass-to-mould interaction. The interaction of both a cast iron mould material and carbon-carbon composite materials with a soda-lime-silica glass were examined using the techniques of scanning electron microscopy, x-ray photoelectron spectroscopy and atomic force microscopy in order to determine the type and extent of surface damage formed. The surfaces of the pressed glass samples made were found to contain defects of embedded particles and indented dimples. The embedded particles found were usually due to bulk material transfer from the plunger material used. The texture found on the surface of the pressed glass samples was found to be directly affected by the surface fmish of the plunger. Pressing glass samples using a cast iron plunger at an initial plunger temperature below 450°C resulted in a randomly rippled 'chilled' surface. As the initial temperature of the plunger was increased, the surface texture of the pressed glass became a closer replica of the plunger surface. The use of vacuum assistance to form the glass samples also resulted in the surface of the pressed glass becoming a closer replica of the original plunger surface, even at lower pressing temperatures. The surfaces of the cast iron and carbon-carbon composite plungers appeared to have been affected by the initial plunger temperatures used. As the initial pressing temperature was increased, the amount of oxidation for both material types increased. In the case of the carbon-carbon composite materials investigated, both the matrix and fibres were found to have broken down at the pressing temperatures used. X-ray photoelectron spectroscopy, of the pressed glass surfaces and the plunger materials indicated that sodium ions had migrated from the glass melt to the plunger surface during forming.
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Vantomme, Pascal. "Contribution a l'etude des outillages et de leur lubrification dans le formage du verre creux : evolution vers une lubrification integree." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13112.
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Etude des proprietes de l'interface moule-verre et plus particulierement les phenomenes d'adherence. Trois types de materiaux de construction du moule sont etudies : des ceramiques (siliciures ou carbure de bore), des composites carbone-carbone et des materiaux frittes. Pour chacun de ses materiaux, les problemes de frottement et d'adherence sont etudies. L'analyse tribologique montre que la lubrification est convenable pour de faibles taux de permeabilite
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McCartney, Aron. "The development and utilization of the ceramic shell mould technique and mould surface release agents in the design and forming of small scale studio hot glass." Thesis, Open University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394788.
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Silva, Beethoven Max Alves da. "Influencia da microestrutura inicial e material de molde na tixoconformação da liga A356." [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263687.
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Orientador: Maria Helena RobertDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
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Resumo: Neste trabalho investiga-se a influência da microestrutura inicial e do material do molde na tixoconformação da liga A356. São produzidas e testadas em operações de tixoforjamento pastas obtidas por três distintos processos: fusão parcial controlada de estrutlJ'aS dendríticas grosseiras, fusão parcial controlada de estruturas ultra-refinadas e pastas obtidas por agitação mecânica do líquido durante solidificação. É produzido ainda um compósito A356 + Ab03 obtido por compofundição. Os tixoforjados foram submetidos à análise metalográfica para caracterização microestrutural, medindo-se a fração da fase primária e o tamanho médio de glóbulo ou roseta da fase sólida. Os resultados obtidos mostram a viabilidade da utilização de moldes não metálicos e operações de tixoconformação com produtos de bom acabamento superficial e dimensional. As forças de tixoforjamento são dependentes da condição inicial da matéria-prima, de forma que forças maiores são requeridas com o aumento do parâmetro microestrutural básico (espaçamento interdendrítico, tamanho de glóbulo e tamanho de roseta) da matéria-prima
Abstract: This research aims the influence of initial microstructure and die material on thixofonning of A356 alloy. Obtained slurries are produced and tested in thixoforging operation by three distinct processes: controlled partial melting of coarse dendritic structures, controlled partial melting of ultra-refined structures and obtained slurries by liquid mechanical stirring during solidification. It is still produced a composite A356 + AbO:i obtained by compocasting. Thixoforged samples were submitted to metalographic analysis for microstructural characterisation, measuring the primary phase fraction and globule average size or 50lid phase rosette. Obtained results showed the viability of non-metallic dies in thixoforming operations with good superficial and dimensional finishing produds. Thixoforging forces are dependent on initial condition of raw material, 50 that higher forces are required with the increasing of basic microstructural parameter Onterdentritic spacing, globule size and rosette size) of raw material
Mestrado
Materiais e Processos de Fabricação
Mestre em Engenharia Mecânica
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Hauptmann, Marek. "Neue Einsatzpotentiale naturfaserbasierter Materialien in der Konsumgüterproduktion durch die technologische Entwicklung des Ziehverfahrens am Beispiel der Verpackung." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-226715.
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Die Produktion verschiedener Arten von Gütern ist im globalen Kontext gesellschaftlicher Entwicklung fortwährend an die Verfügbarkeit von Ressourcen gebunden und durch diese zunehmend begrenzt. In den bis heute entstandenen Wertschöpfungsketten basiert die verlustarme und effiziente Verteilung von Produkten, Zwischenprodukten, Halbzeugen sowie auch Rohstoffen auf den spezifisch auf die jeweiligen Erfordernisse eingestellten Funktionen ihrer Verpackungen. Als Bindeglied in nahezu allen Teilen der Produktion werden die Verpackung und ihre Herstellung innerhalb des mit Abstand größten Teils ihrer Anwendung, den Konsumgüterverpackungen als Beispiel für die Diskussion von Einsatzpotentialen naturfaserbasierter Materialien verwendet. Die Habilitationsschrift stellt die Ausgangssituation in der weltweiten Konsumgüterproduktion und Ressourcenverfügbarkeit dar und ordnet die Position naturfaserbasierter Packmittel in diese ein. Es werden Technologien zur Formgebung naturfaserbasierter Materialien zu Packmitteln zusammenfassend dargestellt. Die Ziehtechnik wird im Speziellen in Form eines Leitfadens in ihren Wirkmechanismen und Prozessvarianten sowie in Bezug auf ihre technische Umsetzung dargestellt. Es werden Beispiele konkreter Anwendungsmöglichkeiten diskutiert.
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Ventura, Jaime Milan. "Desenvolvimento de aços para conformação a frio de elemento de fixação do feixe de molas." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-15042011-142700/.
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Neste trabalho foi desenvolvido o material e o processo de fabricação, que possibilitasse a fabricação de grampo de feixes de mola para veículos comerciais leves, médios e pesados, sem a necessidade de aplicação de tratamentos térmicos como têmpera e revenido. Assim, foram desenvolvidos/analisados cinco tipos de aço com adição de cromo, níquel e silício que possibilitassem a conformação a frio do grampo, garantindo as propriedades mecânicas requeridas pelos grampos, tais como: resistência à tração (900 MPa mín.), limite de escoamento (720 MPa mín.), alongamento(10% min.) e dureza(24-32 HRC). Os aços desenvolvidos exibiram uma microestrutura composta de grãos de perlita e ferrita, sendo que o tamanho de grão perlítico (ASTM) entre 9 a 11 foi obtido pela adição dos elementos de liga alumínio e vanádio que atuaram como refinadores de grão. A avaliação das propriedades mecânicas foram realizadas segundo a norma ASTM A-370 e os corpos de prova foram ensaiados em um sistema dinâmico MTS 810. As análises microestruturais dos aços, após a deformação a frio, foram realizadas por meio de microscopia ótica e eletrônica de varredura, com o objetivo de se identificar a deformação a frio nas áreas desejadas. A validação final do aço e do processo de fabricação do produto foi obtida após a conclusão do ensaio de fadiga que foi realizado em temperatura ambiente, sob carregamento cíclico tração-tração com R = 0,1 e freqüência de 30 Hz, onde a metodologia Probabilidade acumulada da falha (Weibull) foi utilizada para auxiliar na conclusão final do projeto. Foi observado que o aço tipo-4 com adição de cromo (0,21%) apresentou o melhor resultado em fadiga.In this present work the steel and the production process was developed, in order to produce U-Bolts to light, medium and heavy commercial vehicles, without any heat treatment, such as heating and tempering. Thus, this search of five types of steel with chrome, nickel and silicium addictions for the U-Bolts cold forming, assuring the mechanical properties required, as, strength (900 MPa min), yield stress (720 MPa min), elongation (10% min) and hardness (24-32 HRC). The developed steel exhibited a microstructure composed by perlite and ferrite, with the perlite grain size (ASTM) from 9 to 11, as aluminum and vanadium acted as grain size refiners. The evaluation of the mechanical properties was made according to ASTM A-370 and the samples tested in a dynamic system MTS 810. The microstructure analyses of the steel after cold forming were made using optical and scanning eletronic microscopic, in order to identify the cold forming process. For the steel and the production process validation a techniques fatigue test. They were carried out under a load-controlled (tensile-tensile), R = 0,1 and 30 Hz frequency, using the Weibull statistic method, to the final conclusion of he project. Type-4 steel with chrome addiction (0,21%) presented the best result in the fatigue test.
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Frühauf, Patrik. "Zařízení vzduchotechniky a kvalita vzduchu v budovách." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227751.
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This thesis deals with the relationship between HVAC systems and internal microclimate of buildings. The work discusses briefly about different components which are formulating internal microclimate. More details are then focused on the issue of microbial microclimate.
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Arslan, Hulya. "Synthesis And Characterization Of Nickel Based Bulk Amorphous Alloys." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/3/12605099/index.pdf.
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The aim of this study is to synthesize and characterize new bulk amorphous alloys in the Ni- based systems. Theoretical studies on the basis of semi-empirical rules and the electronic theory of alloys in pseudopotential approximation has been provided in order to predict the impurity elements that will lead to an increase in the glass forming ability of Ni-based alloy systems. Glass forming ability of ten different compositions of alloys of Ni-Nb, Ni-Fe, Ni-B, Ni-Hf and Ni-Cr was simulated by using FORTRAN programs based on pseudopotential theory. In addition to the binary alloys, ternary alloys, which were formed by addition of 1 at% of third element to these systems, were also simulated. Since ordering energy is an indicator of glass forming ability, theoretical studies allowed to predict the effect of various third elements on the formation of amorphous phase. Furthermore, ordering energies were also used to calculate other parameters important for glass forming ability. In the second part of the study, on the basis of theoretical results, a series of casting experiments were done. Different compositions of Ni-Nb, Ni-Nb-Sn and Ni-Nb-Al alloys were cast in the centrifugal casting machine. Alloys were melted in alumina crucibles and cast into the copper moulds. Characterizations of cast alloys were done by the use of Metallography, SEM, XRD and DSC. Fully amorphous Ni52Nb41Al7 alloy was synthesized in bulk form with 0.8 mm thickness.
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Adamec, Lukáš. "Návrh technologie výroby plastové páčky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228847.
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The aim of this project is to design the most suitable technology for manufacturing of the set component. The project contains theoretical and practical part. The theoretical part deals with division of polymer material and the description of the technology suitable for production of the set component. The practical part concentrates on the mould design of the set component including calculations and needed technological parameters of injection moulding operation.
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Gobl, Christer. "The Voice Source in Speech Communication - Production and Perception Experiments Involving Inverse Filtering and Synthesis." Doctoral thesis, KTH, Speech Transmission and Music Acoustics, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3665.
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This thesis explores, through a number of production andperception studies, the nature of the voice source signal andhow it varies in spoken communication. Research is alsopresented that deals with the techniques and methodologies foranalysing and synthesising the voice source. The main analytictechnique involves interactive inverse filtering for obtainingthe source signal, which is then parameterised to permit thequantification of source characteristics. The parameterisationis carried by means of model matching, using the four-parameterLF model of differentiated glottal flow.
The first three analytic studies focus on segmental andsuprasegmental determinants of source variation. As part of theprosodic variation of utterances, focal stress shows for theglottal excitation an enhancement between the stressed voweland the surrounding consonants. At a segmental level, the voicesource characteristics of a vowel show potentially majordifferences as a function of the voiced/voiceless nature of anadjacent stop. Cross-language differences in the extent anddirectionality of the observed effects suggest differentunderlying control strategies in terms of the timing of thelaryngeal and supralaryngeal gestures, as well as in thelaryngeal tensions settings. Different classes of voicedconsonants also show differences in source characteristics:here the differences are likely to be passive consequences ofthe aerodynamic conditions that are inherent to the consonants.Two further analytic studies present voice source correlatesfor six different voice qualities as defined by Laver'sclassification system. Data from stressed and unstressedcontexts clearly show that the transformation from one voicequality to another does not simply involve global changes ofthe source parameters. As well as providing insights into theseaspects of speech production, the analytic studies providequantitative measures useful in technology applications,particularly in speech synthesis.
The perceptual experiments use the LF source implementationin the KLSYN88 synthesiser to test some of the analytic resultsand to harness them to explore the paralinguistic dimension ofspeech communication. A study of the perceptual salience ofdifferent parameters associated with breathy voice indicatesthat the source spectral slope is critically important andthat, surprisingly, aspiration noise contributes relativelylittle. Further perceptual tests using stimuli with differentvoice qualities explore the mapping between voice quality andits paralinguistic function of expressing emotion, mood andattitude. The results of these studies highlight the crucialrole of voice quality in expressing affect as well as providingpointers to how it combines withf0for this purpose.
The last section of the thesis focuses on the techniquesused for the analysis and synthesis of the source. Asemi-automatic method for inverse filtering is presented, whichis novel in that it optimises the inverse filter by exploitingthe knowledge that is typically used by the experimenter whencarrying out manual interactive inverse filtering. A furtherstudy looks at the properties of the modified LF model in theKLSYN88 synthesiser: it highlights how it differs from thestandard LF model and discusses the implications forsynthesising the glottal source signal from LF model data.Effective and robust source parameterisation for the analysisof voice quality is the topic of the final paper: theeffectiveness of global, amplitude-based, source parameters isexamined across speech tokens with large differences inf0. Additional amplitude-based parameters areproposed to enable a more detailed characterisation of theglottal pulse.
Keywords:Voice source dynamics, glottal sourceparameters, source-filter interaction, voice quality,phonation, perception, affect, emotion, mood, attitude,paralinguistic, inverse filtering, knowledge-based, formantsynthesis, LF model, fundamental frequency,f0.
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Lin, Small Kai, and 林群凱. "Roll Forming Mold Design of T-Bar." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/04219513838319273327.
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碩士國立高雄應用科技大學
模具工程系碩士班
94
The objectives of this paper were to investigate the roll forming of T-Bar steelframe simulated by CAE software-DEFORMTM and to obtain optimum design through Taguchi method. Four control factors were selected, which were roll gap, roll speed, types of progressive angle and number of stations needed for a formed angle. Their levels were as follows: roll gap was 0.25, 0.30 or 0.35mm; roll speed was 20, 25 or 30 rad/sec; types of progressive angle had “average”, “cosine” or “mix” method, and number of stations needed for a formed angle was 5, 6 or 7 stations. The vertical height “H” and the horizontal length “W” of T-Bar steelframe were selected as the quality characteristics. The noise experiments and L934 orthogonal array experiments were conducted and finally obtained the optimum Roll Forming processes, which were as follows: roll gap was 0.30mm; roll speed was 20 rad/sec; types of progressive angle was cosine method, and number of stations for a formed angle was 7 stations. The results found roll gap could be used to adjust the nominal value of dimensions W and H, so also called as an adjusting factor, and Roll speed and number of stations for a formed angle could be used to reduce variations. The results also showed that when roll gap was equal to the sheet thickness, the quality was the best, and when smaller or lager, the quality became bad. The slower the roll speed, the better the quality. The larger the degrees of the progressive angle, the bigger the stresses in the material, and number of stations nearly determined the degrees of the progressive angle, therefore, the larger the number of stations, the bigger the stresses.
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WU, CHIH-YU, and 吳芷諭. "A Mold-Flow Analysis of Using Family Mold to Improve Product Forming by Injection Molding." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/zf7mxz.
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碩士東海大學
工業設計學系碩士在職專班
107
With the global competition between fast-changing and diversified industries, the key to success is to satisfy market demands and to enhance the current competitiveness and product efficiency of industries. The critical factors include reducing the cost of development of plastic molding and strengthening the advantage of plastic injection. Each industry’s primary considerations include the great reduction of the pressure due to cost and the reduction of development time. In this study, the family mold of a cell phone holder that is designed by product modularization is analyzed. The cell phone holder is formed by top and bottom clamps, a small part, and two accessories. Since plastic injection molds are conventionally designed by molding houses in the traditional industry, tool makers fabricate tooling and determine the designs of cavity layout, runner size, and gates based on years of experience of their own. In this study, the approaches of mold flow analysis and Taguchi method are implemented to analyze the defective designs of front-end tools in conventional molding. After that, the molding can be improved by back end analysis in order to determine the optimal injection conditions and enhance the competitiveness of the industry. The results of this study indicated that, the critical factors that affect the S/N ratio include mold temperature, injection speed, and different runner designs. The Moldex 3D simulation software was used to analyze the mold flow of real injection molds in order to determine the optimal injection conditions and the optimal runner size. This approach can improve the problem of shrinkage and recess of injected parts due to longer cooling time and the flow imbalance of family molds with multiple cavities. The results indicated that the production capacity can be increased and the product competitiveness can be enhanced by adding more cooling passages, changing the thickness of the part, improving the longer time for cooling, and reducing the injection time and displacement of the injection mold.
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Wang, Chien Ming, and 王健銘. "Mold design and analysis of the electromagnetic micro-forming process." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/46340138842263140184.
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碩士清雲科技大學
機械工程研究所
96
The development in science and technology is fast now; the products are designed and manufactured by nanometer scale, it makes the micro-forming processes more important today. In micro-forming, the using of nontraditional technologies such as EDM, WEDG, PVD, PVC etc..., is rather normal. In this study, an electromagnetic micro-forming process is designed that the induced electromagnetic force will attract the ferromagnetic punch to contact the workpiece, and then forced the workpiece to deform. The experimental apparatus for the electromagnetic micro-forming process will be designed and manufactured. Meanwhile, the analysis of the micro-forming process by the dynamic FEM is examined. The relative experiment will proceed simultaneously. The sizes and shapes of the forming die and punch are discussed in details. Two solving methods for spring back phenomenon will be observed and assessed. These analytical results have been rather useful in the tools design, the products control and forming limit prediction. The most significant advantage is developing the precise analysis technology to suit for the future necessity of manufacturing processes in 3C industries.
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余東陽. "The process studies of spray forming mold using low melting alloy." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/89233033032332049488.
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碩士建國科技大學
機械工程系暨製造科技研究所
97
In this study, an innovative method based on high pressure thermal spraying technologies is used to melt Sn-Bi Alloy and atomized into semi-melting minute particles. The atomized powders are used to manufacture metal Rapid Tooling (RT). We experimentally investigated measured the natural heat transfer performance of metal mold that make up of different metal powders such as atomized Sn-Bi Alloy powders, Aluminum alloy and metal resin. The experimental results show that the heat transfer performances of metal mold make up of Aluminum alloy, atomized Sn-Bi alloy powders, Sn-Bi alloy casting and metal resin in sequences. We also proposed a new permeate method to manufacture the backup material of spray mold. Firstly, the atomized Sn-Bi alloy powders are uniformly filled into the back of the spray mold. The metal resin in then poured and permeated into the powders to manufacture the backup material. The experimental results show that the heat transfer performance of permeate method is better than that of pre-mixed method of powder and metal resin.
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Shen, Yu-Chieh, and 沈煜傑. "A study on the SystematicalUltrasonic-Assisted Molded Parts Releaseof Mold Forming." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/01458958570588741201.
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碩士逢甲大學
機械工程學所
97
According to the need of energy-saving concept for plastics injection molding, a systematically analytical methodology simulating the molded-part release by means of ultrasound-aided wave transmission instead of the traditional eject-pin mechanism is successfully implement in this study. The acceptable mode shape, the natural frequency of the ultrasonic device, and the operating frequency are correlated attributed to the preliminary modal analysis. Meanwhile, a novel wave-guided block for enhancing the response sensitivity of the ultrasonic transmission is also proposed in this study. The wave-guided block can be used as the modification of the incident-wave angle and/or the amendment of the concentration of ultrasound beam. For fast and easily releasing the molded part, uniform displacements in some critical points of the molding die are needed. Thereby, the molding die , the ultrasonic transmission device, and the incident ultrasound must be carefully and suitable design and analyzed. In which different incident positions of the ultrasonic horn correlated to the mold die mechanism, different incident angles of ultrasonic waves, and the geometry of wave-guide are studied and design. Accordingly, the acceptable or optimal harmonic (or harmonic) frequency of the mold-die device related to the acceptable or optimum mode shape, the distance of the relative position between the mass center of the mold die and the geometric-shape center of the ultrasound transmission horn, and the most acceptable or favorable incident angle of ultrasonic waves are found under the consideration with and without the wave-guided block. Consequently, as using the wave-guide block joined to the device of the mold die, the uniformity of displacement at critical points are relatively enhanced.
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Wu, Dong-Yan, and 吳冬彥. "Mold Design and Analysis in Superplastic Forming the Airliner Wing’s Fairing Cover." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/66763953707672120675.
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碩士國立中央大學
機械工程學系
101
The study focuses on the mold and manufacturing process of aluminum alloy spare parts “airliner wing’s fairing cover” for aircraft manufacture industry. Superplastic forming manufacturing process usually using aluminum alloy plate and the molding contour is designed by low aspect-ratio. In this study, the airliner wing’s fairing cover molding contour is designed by high aspect-ratio. The aluminum alloy plates can’t be directly used for superplastic forming process. In order to improve the design of high aspect ratio, the SP5083 sheets bended for a preforming before superplastic forming process. The bending preforming in order to reduce the forming distance between SP5083 sheet and mold, then the spare parts fairing cover can be successfully produced. And there are several designs to reduce the forming distance manufacturing process, such as Two-Stage Superplastic Forming and Hot Draw Mechanical Preforming, etc. Because of large-sized mold and the experments need to comsume large cost, such as electricity bill and aluminum sheet meterials, etc. And the experiment coordinate with AIDC production line free time. So the experiment have restriction on the number. In order to reduce costs and increase the efficiency of the experiment. In this study, the mold is designed a small-sized model. And the mold contour also is designed, different model such as Two-cavity designed have same depth, enlarge the bottom of the V-shape preforming curvature radius, bottom of the V-shape preforming designed lower, etc. Analyzing the merits of the manufacturing process and mold design and choosing the best mold and manufacturing process.
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Huang, Chung Yao, and 黃宗燿. "Roll forming mold design of metal rolling shutter door and door track." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/80038034012404165112.
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碩士國立高雄應用科技大學
模具系碩士在職專班
105
Mold is the mother of industrial，Mold is a fountain of machinery Competitiveness. The mold development process consists of material selection, design, precision machining, surface finishing, and the application of relevant software knowledge. Cold rolled round mold is usually the manufacturer of roll mold manufacturing, production machinery manufacturers after installed into the machine. Round die-mold is used to form sheet metal materials of metal pieces. Cold rolled round mould curved surface of the mould is a die, a continuous bending operation series sets in gradually forming roller until you obtain the desired section of the configuration. Of cold rolled round steel plates by using different forming mold and the operation and achieve the final section. In the case of continuous rotation will be punching and shearing action to meet the required length of cold rolled round molding machine is the production of a long object and good ideal machine to be made in large quantities. Therefore, this thesis will be 75mm rolling shutter door lath and 48mm door track as main of development standard of; and for wave shaped door lath and long strip of shape characteristics, design out a group more paragraph type of roll round mold and manufacturing process, match special form of cut mold and machine to completed metal rolling shutter door lath and track of mass production, Hope the research of this thesis academic and industry a few help.
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張振裕. "The thermal stress analysis of the forming mold of glass optical elments." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/23338637118457629891.
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LI, JI-HUAN, and 李季桓. "Applying of 3D In-mold Decoration Technology on Forming a Film with Conductive Circuits." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/38320528526823451543.
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碩士國立高雄應用科技大學
模具工程系
105
IMD (In-Mold Decoration) in mold decoration for the pattern structure of plastic product in the injection molding filling in and melt together forming, simplifying the machining process, and meet the needs of mass production with the molding technology in mold decoration, IMD technology is divided into three main categories, namely, IMR (In-Mold, Roller), IML (In-Mold, Label), IMF (In-Mold, Forming). IMF process products are subject to the influence of shape, mold design and forming parameters, and produce rupture, wrinkles or stress concentration, resulting in poor appearance, the traditional mold decoration can be applied only in the plane or moderate, if the curvature is large, easily lead to rupture and wrinkle, so the study in film printing, thermoforming and injection molding design, product testing, planning and design a series of experiments. and the design of acute angle, obtuse angle, concave arc, convex arc, straight line in round shape and angle shaped two types of products, to observe the shape of the thermoforming and injection molding quality change process, combined with the printed circuit technology, development the diversity of IMF applications. In this study, the three-dimensional process of film, using gas-assisted thermoforming technology, and three methods of forming without pre drawing, pre drawing and local heating respectively, the results show that the effect of local heating is best, the average thickness of rounded film is reduced by about 4.27%, the most serious position is concave arc, the stress concentration is completely disappeared when the mold temperature is 165 °. Injection molding, set four factors, A mold temperature, B plastic temperature, C injection speed and D packing press, through the Taguchi method, the best parameters of the injection molding are rounded A2B3C1D1, beveled A2B2C2D2, and the parameters with the highest contribution rate are packing pressure. With conductive circuits IMF finished only the use of local heating hot pressing method can be successfully formed, and the resistance in the process after forming the measurement values are the same.
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CHANG, HAN-CHING, and 張漢卿. "Investigations on the Better Performance of Product Forming by Injection Molding with Mold-flow Analysis." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/99839h.
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碩士明新科技大學
機械工程系精密機電工程碩士在職專班
106
Plastic products are widely used in our daily necessities. In recent years the demand of plastic products is not only providing powerful function but also displaying better appearance and vision. For satisfying the demand of market and breaking through the traditional limitations on appearance and vision, Moldflow CAE software provides the best performances for the design of perfect appearance and vision. In this research, injection molding technology with mold-flow analysis are used to investigate the processes of filling, packing and cooling for the optimal design on the vehicle electronic antenna (GPS antenna of car). It can confirm to reduce the phenomena of rough and shrinkage for the plastic products and to satisfy the demand of our customers by using these technologies.
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Tseng, I.-Hsien, and 曾義憲. "A Study of the Manufacture Process Design for the Autoclave Forming Metallic Mold of Composite Materials." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/30705766693420939792.
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碩士國立高雄第一科技大學
機械與自動化工程所
91
The composite materials with high specific strength and specific stiffness are ideal for airframe structure. Generally, the manufactures of airframe structure composite parts require imposing heat and pressure on its forming process. Autoclave forming is the most popular used method of applying heat and pressure simultaneously. When judged strictly on the basis of dimensional accuracy, stability and durability in mass production, metallic mold often turns out to be the best choice. The objective of this thesis is to develop the manufacture processes of the autoclave forming metallic molds, which include welded mold and cast mold, for composite materials. The critical manufacture process of the welded mold is creating its mold face, which composed of several rolled steel elements with 1 inch thick. First, the reverse engineering skill is used to decompose the mold face into several pieces of elements, and the shape of each element is a portion of rollable metal thick plate. Each element is made by rolled, cut and grinded processes of the metal thick plate, then, they will be welded together from to a raw mold. The mold was done after machined and polished. The key manufacture challenge of the cast mold is to prevent mold face from leakage in the forming process of composite parts. A leakage experiment is set to test the seal materials and skills. The high phosphorous Electroless Nickel Deposition coating is found that it has excellent property for seal of the cast steel leakage in high temperature and vacuum conditions. Therefore, for the cast mold of autoclave forming, that coating process added to the manufacture processes of the cast mold manufacture process. The results show that cast and welded molds can be the metallic mold of autoclave forming by using above the manufacture processes. In addition, compared with welded mold, the cast mold has easier design skill and fabrication process, lower manufacture cost and shorter manufacture time.
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Hsu, Chin-yu, and 許晉瑀. "3D Parametric Design for Vacuum Forming Molds." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/97980832437940170681.
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碩士國立臺灣科技大學
機械工程系
97
This study aims to develop a 3-D parametric design system for vacuum forming molds. An engineer can use the system to complete the design of the vacuum forming mold in a short period of time based on his/her molding experiences. The objectives of this study include: (1) establishing the 3-D geometric model for mold bases and mold cavities of vacuum forming mold, (2) introducing the parametric design method to achieve rapid design modification of mold plates, (3) creating an automatic assembly system that allows the user to select and assemble the mold base rapidly based on the product forming method, (4) building a cooling selection system to allow the user to select the desired cooling method. As for system implementation, Pro/Toolkit in Pro/Engineer and MFC in Visual C++ are used in this research to develop the proposed system. A mold engineer can apply the developed system in practice to significantly reduce the time needed to re-establish the 3-D geometric models of vacuum forming molds.
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CHAN, CHIA HAO, and 詹家豪. "The Study on In-mold Formingof Flat Head Screws." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/q8663h.
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碩士高苑科技大學
機械與自動化工程研究所
106
In this study, by simulating three-stage forming machine, the forming force and formability of flat head screws are investigated experimentally and numerically. The numerical simulation of three-stage forming is studied by using FE code of DEFORM-3D. To forming a larger head of screw, a billet with larger diameter is used. The first stage is to extrude a billet into smaller diameter rod. The second stage is pre-forming of head. The third stage is in-mold forming of flat head. It is revealed experimentally and numerically that, for stage 1, the extrusion forming is not affected by the length of billet; for stage 2, the billet is freely bulged in the cylindrical cave of punch, and forming force is similar to stage 1. When the billet is not completely bulged, it is likely to cause a significant crease on the head in stage 3 of in-mold forming of flat head. Therefore, in order to upset a complete circular flat head in stage 3, the billet should be bulged completely in stage 2 of head pre-forming. The more is the pre-forming billet, the larger flat head is formed. The stage 3 is to in-mold upset the billet into a complete cylindrical head. The stroke is shortest, but the forming force is largest. Particularly, when the billet is compressed to reach the inner wall of the die, the forming force varies dramatically. The larger outer diameter is the head, the greater forming force is required. The forming force of stage 3 is much larger than stage 1 and 2, and the of punch and die for stage 3 is thus less, and leads to the loss of related parts of operating forming machine. Keywords: Three-stage forming machine, flat head screw, in-mold forming, forming force.
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Hong, Bo-Wei, and 洪柏瑋. "Study on the processes of forming micro-gears by trough mould." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/44y9jr.
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碩士國立臺灣海洋大學
輪機工程學系
106
At present, traditional manufacturing technology cannot carry out a better quality manufacturing process for miniaturized gear by reason of the mould design cannot provide the material with an effective compressive stress. Following by the advance of technology and the innovation, most of the components toward the development of light and thin, miniaturization of components is an inevitable trend. It is difficult to produce micro products using traditional manufacturing technologies. This dissertation is used a trough-form blanking and extrusion cutting technology and can successfully produce high-quality parts in sheet (diameter 40mm thickness 10mm) and block (diameter 40mm thickness 30mm) material and can be better than the traditional technology. The technical characteristic is to design a ring trough-form on the mould that well provided a hydrostatic pressure to the material to resist the deformation of the tensile stress. Based on the above characteristics, the trough-form is a helpful to transfer technology into the manufacture of miniaturized gear parts, and it is a feasible and high precise forming technology.
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Zhan, Min-Han, and 詹旻翰. "A Study on Optimization of Molds Arrangement Module for the Autoclave Forming Process." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/4c5s4p.
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碩士國立臺灣大學
機械工程學研究所
106
With excellent mechanical properties and light weight, advanced composite materials have gradually replaced the traditional material, such as metallic material, and to be used in the aircraft structure. In the aerospace industry, autoclave processing is one of most common advanced composite materials processing techniques, and considering the high cost problem, it is an effective way when simultaneously curing diverse composite parts. However, many scholars have established an empirical equation or finite element model of autoclave processing by computational fluid dynamics and experiment to predict the heat-up of composites in order to improve an non-uniformly heating problem when diverse composites are cured in same processing, and found the main factors influencing heat-up is the geometric characteristics of the mold and shadowed by other molds, so it is more important to obtain the accuracy and efficiency of the two impact factors. In order to achieve the goal of accuracy and efficiency improvement, this thesis will analyze the heat transfer mechanism of the mold in the autoclave processing by fluid dynamics simulation analysis, and summarize the heat transfer parameters related to the heat-up of the mold, and establishes the prediction formula which can effectively quantify the effect on geometric characteristics of the mold and shadowed by other molds. Finally, the research of the heat transfer parameters are applied to the empirical formula and the full model of the autoclave processing to reduce the time consumption of the simulation, and the temperature rising time of molds obtained from the empirical formula and the full model differs from that measured from the actual autoclave forming process only within a range of 5%, which shows that the research on the heat transfer parameters of the mold in autoclave processing has practical application value.
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Pramod, kumar *. "Experimental Investigation Of Rheocasting Using Linear Electromagnetic Stirring." Thesis, 2008. http://hdl.handle.net/2005/1059.
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In several applications of casting, dendritic microstructure is not desirable as it results in poor mechanical properties. Enhancing fluid flow in the mushy zone by stirring is one of the means to suppress this dendritic growth. Strong fluid flow detaches the dendrites formed at the solid-liquid interface and carries them into the mould to form slurry. When this slurry solidifies, the microstructure is characterized by globular, non-dendritic primary phase particles, separated and enclosed by a near-eutectic lower-melting secondary phase. This property represents a great potential for further processing in semisolid forming (SSF) by various techniques such as pressure die casting and forging. Among all currently available methods, linear electromagnetic (EM) stirring is considered as one of the most suitable routes for large scale production of semisolid feed stock. One of the biggest advantages of EM stirring is that the stirring intensity and direction can be modulated externally and in a non-intrusive manner. With this viewpoint, the primary objective of the present research is to investigate rheocasting using linear electromagnetic stirring.
A systematic development of a linear electromagnetic stirrer (LEMS) is the subject of the first part of the thesis. The LEMS consists of a set of six primary coils displaced in space. These coils are excited by a three-phase power supply to produce an axially travelling magnetic field. The metal to be stirred is placed in the annular space of the stirrer. The travelling field induces secondary current in the molten metal. The current and magnetic fields interact to generate a net mechanical force in the metal, commonly termed as the Lorentz force. The molten metal is stirred under the influence of this force. Two prototype stirrers, one for low melting alloys and the other for aluminium alloys are developed. The stirrers are characterized by measuring forces on low melting point alloy and on solid aluminum cylinders placed inside the annular space of the stirrer. As an outcome of these tests, a non-intrusive method of detecting stirring of liquid metal is developed.
The development of a rheocasting mould for the LEMS forms the second part of the work presented in the thesis. The mould design and cooling arrangement are such that solidification in the mould is primarily unidirectional. Heat from the solidifying metal is extracted at the bottom of the mould, so that the axisymmetric EM stirring effectively shears the dendrites formed at the solid-liquid interface. The outer surface of the mould is cooled with water or air exiting from 64 jets, each of 4 mm diameter. Such an arrangement provides a high heat transfer coefficient and a wide range of cooling rate in the metal ranging from 0.01 to 10 K/s. Temperature is measured at various depths in the solidifying melt and at other key locations in the mould to assess the various heat transfer mechanisms.
The results from the rheocasting experiments using the above mould and LEMS are presented in the third and final part of the thesis. Such studies are required for understanding the solidification process in presence of electromagnetic stirring and for highlighting the important issues connecting solidification, fluid flow, dendrite fragmentation and the resulting microstructure. A series of experiments are performed with A356 (Al-7Si-0.3Mg) alloy. Experiments are conducted with various combinations of operating parameters, and the resulting microstructures and cooling curves at various locations are examined. The key process parameters are stirring current, cooling rate, pouring temperature, and stirring current frequency. The parametric studies also include the case without EM stirring in which liquid aluminium is poured into the rheocast mould without powering the LEMS.
It is found that stirring at high currents produces non-dendritic microstructures at all locations of the billet. For lower currents, however, dendritic microstructures are observed in regions outside the zone of active stirring. Stirring also enhances heat loss from the exposed top surface, leading to solid front advancement from the top as well. Without EM stirring, microstructures are found to be dendritic everywhere. The percentage of primary α-Al phase and its number density are found to increase with stirring intensity. With a decrease in cooling rate with air as the coolant, the average grain size of primary α-Al phase increases. Excitation frequency is found to be an important parameter, with lower frequencies generating a more uniform force field distribution, and higher frequencies enhancing induction heating. At higher frequencies, the effect of higher induction heating results in the formation of larger and coarser primary phase grains. This phenomenon has led to the development of a one-step process for rheocasting and heat treatment of billets.
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Li, Ming-Yu, and 李明育. "The Study in the Improvements of Mechanical Properties and Tribological Behavior of the Press Forming Molds Processed by the Technology of Plasma Nitrogen Ion Implantation." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/94688063404395125231.
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碩士國立成功大學
微機電系統工程研究所
94
In the present study, three steel materials, DC11, DC53 and SKH51, were selected as the mold substrate materials in the press formings. Five kinds of specimens were prepared by the plasma immersion ion implantation (PIII) technique for each of these three substrate materials by differing the implantation temperature or the volume ratio of nitrogen to hydrogen in the gas mixture. The distributions of nitrogen concentration at the nitrided layer were obtained using a glow discharge spectrometer (GDS). A nanotester was applied to obtain the mechanical hardness and Young’s moduli varying at different penetration depths. This nanotester was also applied to evaluate the fatigue lives and scratch wear resistances of these specimens. A Vickers indentation tester was used to create radial surface cracks in order to evaluate the fracture toughness of a specimen. X-ray diffraction (XRD) was applied to detect the chemical components (phases) formed at the nitrided layer of a specimen. For the specimens with the same substrate material, most of the mean mechanical hardnesses are lowered by the increase in the total penetration depth of the nitrogen; these hardnesses are also largely lowered by increasing the distance of the peak position of nitrogen concentration from the implantation surface. Both the fracture toughness and the fatigue life of a specimen arising at the nitrided layer are elevated by increasing the implantation temperature; however, the behavior exhibited in these two parameters due to the change in the hydrogen concentration are exactly opposite. The mechanical hardness of a specimen is lowered by increasing either the implantation temperature or the hydrogen concentration in the gas mixture. The intensities of four chemical components ( ) show the trend that they are all elevated by increasing the implantation temperature. However, the intensities exhibited due to the change in the hydrogen concentration can be classified into two groups. The rise in the intensity of ( ) is advantageous for the increases in the fracture toughness and fatigue life of a specimen; but is disadvantageous for the increase in the mechanical hardness of a specimen. The enhancement in the intensity of is advantageous for the elevation in the fracture toughness, but is disadvantageous for the increase in the mechanical hardness. The specimens prepared by increasing the nitrogen concentration in the gas mixture is advantageous for the enhancement in the adhesive wear.