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Dissertations / Theses on the topic 'Optimalization of Al castings production'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Vymazal, Aleš. "Výroba a vady masivních odlitků." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229432.

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Objective of diploma thesis is to proceed analysis of actual technology in operational terms for concrete casting of bearing . Constructed by foundry of steel ŽĎAS a.s., Žďár nad Sázavou. After designing changes in technological process accomplish detail evaluation of mechanical properties and chemical homogenity of metal at selected parts of sample casting.

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2

Šmíd, Dušan. "Optimalizace technologie vybraných náročných odlitků ze slitin Al." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228725.

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The main target of this thesis is to choose the suitable hard filled wax for the invest-ment casting foundry Fimes a.s. There are several suppliers of these waxes in the World and in this work waxes of the most reputable suppliers from Europe have been investigated. During these tests there were mainly technological properties of the waxes and also dimensions of both wax patterns and also the final castings measu-red. Suitability of the tested waxes, their technological characteristics, analysis of di-mensions and finally basic economical calculations have been then used in this the-sis as a tool for the recommendation for the most suitable wax for the Fimes foundry.

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3

Whateley, Philip N. "Defects in steel investment castings." Thesis, Aston University, 1991. http://publications.aston.ac.uk/11879/.

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A general investigation was performed, in an industrial environment, of the major types of defect specific to investment castings in steel. As a result of this work three types of metallurgical defect were selected for further study. In the first of these, defects in austenitic stainless steel castings were found to result from deoxidation by-products. As a result of metallographic investigation and the statistical analysis of experimental data, evidence was found to support the hypothesis that the other two classes of defects - in martensite stainless and low alloy steels -both resulted from internal or grain boundary oxidation of the chromium alloy constituent This was often found to be followed by reaction between the metal oxides and the ceramic mould material. On the basis of this study, proposals are made for a more fundamental investigation of the mechanisms involved and interim suggestions are given for methods of ameliorating the effect in an industrial situation.

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4

Dvořák, Pavel. "Plánování výroby s podporou informačního systému." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229980.

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This thesis deals with adding planning to the current information system as requirement by the company. The theoretical part describes the methodes of information systems for the production plan. These tools are mostly general and trying to cover the entire spectrum of manufacturing processes. The practical part is devoted to implementing of the produciton planning. The modul planning is incorporated into the current information system.The modul planning has been implementing for efficiency of the systemand faster throughput of the orders the company.

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5

Tantipaibulvut, Chairath. "An evaluation of the production of magnesium base alloy castings by the expendable pattern casting process." Thesis, Loughborough University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250959.

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6

Teknős, Oliver. "Návrh změn výrobního procesu se zaměřením na rozšíření layoutu." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2015. http://www.nusl.cz/ntk/nusl-224869.

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Master´s thesis deals with the issue of improving production processes in engineering company, which is expanding it´s existing facilities with the new hall. The company is engaged in manufacturing gears and gearboxes. The thesis deals with the design of new layout in new and former facilities in order to optimize material flow, costs and minimize production time.

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7

Klimešová, Lenka. "Optimalizace výrobních toků a procesů ve vybraném úseku společnosti ATONA s. r. o." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2016. http://www.nusl.cz/ntk/nusl-234701.

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This master's thesis deals with optimalization of production flows and processes in se-lected part of the company ATONA s. r. o. Realized suggestions for improvement are based on finding the current state by the corresponding methods. New state is analysed with same methods and compared with original state, also benefits of the realized opti-mization are determined.

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8

Lim, Chu-Sing. "The production and evaluation of fibre preform-infiltrated metal matrix composite castings produced by a developed pressure-assisted investment casting process." Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/28175.

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The squeeze casting process is well known for its ability to produce castings with good integrity due to the high direct pressure application on the liquid metal during solidification. This concept has been used to squeeze infiltrate fibre preforms with liquid metal for metal-matrix composite (MMC) production. Squeeze casting employs fast cycle times to produce high integrity castings. The squeeze casting process is, however, limited in terms of shape complexity and flexibility (e.g. thin sections). One-offs or small production runs become very expensive to produce because of the complex nature and high cost of the die steel tooling.

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9

Langer, David. "Identifikace a hodnocení chyb na výrobní lince a jejich prevence." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229771.

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The manufacturing companies are faced to the strong pressure to decrease the production costs. They are therefore forced to optimize the manufacturing processes and to increase their efficiency. The ideal way to increase the productivity is to optimize the manufacture by increasing the efficacy of the equipment, material, working hours and other sources of finding out causes of wasting in production, it means to abolish the causes of making mistakes.

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10

Youssef, Mohamed Youssef Ahmed Verfasser], Andreas [Akademischer Betreuer] [Bührig-Polaczek, and Gerhard [Akademischer Betreuer] Hirt. "A cost-efficient process route for the mass production of thin-walled structural aluminium body castings / Mohamed Youssef Ahmed Youssef ; Andreas Bührig-Polaczek, Gerhard Hirt." Aachen : Universitätsbibliothek der RWTH Aachen, 2021. http://d-nb.info/1235669696/34.

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11

Pravec, Libor. "Studie projektu výrobního systému." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2010. http://www.nusl.cz/ntk/nusl-409532.

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This Master‘s thesis describes throughput of manufacturing order in company Walter s.r.o. It is a proposal of improvement system to monitoring order in mounting. Better told, it is unification of dates to central place and accessing to all concern. This company belongs to the group WALTER MASCHINENBAU GmbH. The bussines comunity deals with developments, production and selling of CNC (by computer numeric controlled) machines for production, fine grinding and measuring tools.

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12

Stříž, Radim. "Optimalizace produkce bakteriální celulózy." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2021. http://www.nusl.cz/ntk/nusl-449757.

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This diploma thesis focuses on the optimization of bacterial cellulose production by Komagateibacter xylinus DSM 46604. The theoretical part of this thesis describes the properties of bacterial cellulose, its production and application possibilities. The experimental part aimed to assess the effect of different cultivation conditions on the production yields of bacterial cellulose. The effects of several cultivation strategies have been studied such as: (1) effect of acetate buffer used as a medium, (2) impact of oil added into the medium, (3) fed-batch cultivation, (4) variation of the volume of cultivation vessel and cultivation media and (5) aeration. In addition to the production of relatively thin samples, up to 100 µm was synthesized unique 3D structured bacterial cellulose in the form of cylinders, with a height up to 2 cm. The growth of bacterial cellulose in the form of cylinders was achieved by dynamically cultivating K. xylinus in combination with fed-batch approach.

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13

Matoušek, David. "Optimalizace a návrh tiskového centra za využití metod štíhlé výroby ve společnosti IMI International, s.r.o." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400928.

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This Master's thesis deals with the design of a new workplace and the optimization of the process of printing production documentation for given production sections at IMI International Ltd. The solution to the problem begins with an analysis of the process that pointed to certain types of waste. Then, the process was optimized and a more efficient workplace with ergonomic features was designed. In the last part of the thesis the proposal is technically and economically evaluated.

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14

Bistrá, Vendula. "Návrh štíhlé výroby ve vybraném provozu." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2015. http://www.nusl.cz/ntk/nusl-225298.

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The thesis is focused on the implementation of a lean component in the manufacturing process of First Brno Machinery Velká Bíteš, Ltd. With the help of lean componant Value Stream Mapping (VSM – value stream mapping) an analysis of the current status is determined that underlies the bottleneck analysis in the manufacturing process. Based on that analysis the optimal future state of the manufacturing process is designed which leads to a production efficiency. This thesis focuses on increasing customer value and reducing waste in manufacturing.

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15

Přibyl, Lukáš. "Optimalizace výrobního procesu ve firmě Zambelli-technik s.r.o." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2008. http://www.nusl.cz/ntk/nusl-264885.

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This master’s thesis presents production process optimization in Zambelli – technik s.r.o. company acting on metal production and work metal in České Budějovice. The aim of optimization is to secure continuous input flow of material into production. It compares current material costs with material costs after the optimization, that consists in sheetmetal coil handling and cutting machine purchase.

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16

Polák, Martin. "Racionalizace výroby digitálního přijímače." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217954.

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This diploma thesis deals with topics related to optimalization and increases quality production in the electronics industry. Project purpose was to analyze process production manufacturing digital receiver in specific situation applied upon multinational company. Main part mine work was build-up FMEA analysis and creation control plan production line. For optimize production flow was application method lean production and for department material supply method KANBAN. This diploma thesis has been written within cooperation of Celestica Ráječko company where I have picked up data and knowledge to above-mentioned topic.

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17

Vrbacký, Tomáš. "Návrh tvorby štíhlého výrobního procesu ve výrobní hale." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2018. http://www.nusl.cz/ntk/nusl-377385.

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The intent of this thesis is to design a lean production process for a manufacturing plant owned by TOS KUŘIM - OS. a.s. The manufacturing process is analyzed using the value stream mapping method. The method is used to identify inefficient steps in the production process. Furthermore, the thesis offers solutions to the recognized problems, aiming to increase added value and minimize waste.

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18

Veselá, Markéta. "Produkce beta-glukanů vybranými druhy kvasinek, řas a sinic." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2018. http://www.nusl.cz/ntk/nusl-376880.

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Several yeast strains and microalgae were selected for this diploma thesis. -glucans, lipids, carotenoids, ergosterol and coenzyme Q were determined in selected producers, and the cultivation conditions for yeast strains were optimized to gain enhanced production of -glucans. Microalgae cultivations were carried out according to the instructions of the Collection of Autotrophic organisms (CCALA). Selected microalge strains include Desmodesmus acutus, Dunaliella salina, Arthrospira maxima and Cyanothece sp. Selected yeast species include Rhodotorula glutinis, Cystofilobasidium macerans and Sporidiobolus metaroseus. Edible yeast Saccharomyces cerevisiae was cultivated to compare with other yeast strains because of it's verified production of -glucans. -glucans were then determined by the enzymatic kit K-YBGL Megazyme, carotenoids, ergosterol and coenzyme Q were analyzed by HPLC/PDA and fatty acids were analyzed by GC/FID. The best producer of yeast -glucans was R. glutinis and S. metaroseus, and the best conditions for the production of -glucans and other metabolites was the C/N ratio of 70. Within the microalgae species, only -glucan production was observed, the best producer was D. acutus.

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19

Hůrka, Radek. "Návrh prototypové SMT linky s využitím nových technologií." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217728.

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The general aim is the present proposal of technological machine surface mount line for small lot and prototype production. This project enables to expand production, application of new technology, increase of flexibility in companies which deals with prototype production. The practical part of this work give view on optimalization of leadfree process.

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20

Banatová, Radomíra. "Řízení jakosti ve výrobě firmy." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2008. http://www.nusl.cz/ntk/nusl-221709.

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This masters thesis considers the proposal for quality improvement of an industrial process. Established methods and proccesses according to valid ISO standards are described here. There are recommended proposals and methods for improvement of current situation of processing On the production of provided informations here.

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21

Spěváček, Jiří. "Návrh vylepšení procesů jakosti omezovače dveří pro Škodu Yeti." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2010. http://www.nusl.cz/ntk/nusl-222736.

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This work deals with the quality of product, be specific quality of door balancer for Škoda Yeti car. This product is produced by company Edscha Bohemia s.r.o. First of all we describe the company and the product itself, arter that we present actual sitution of development and production of door balancer in this company and finally we present innovations of quality processes used by production of the door balancer.

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22

Dostálová, Markéta. "Optimalizace operačních nákladů obráběcího procesu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230505.

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This work deals with operating production costs in machining process and further optimalization. In the first chapter, individual costs items which are related to machining process are specified. These cost items are quantified and total production costs are acquired. Optimalization of operation production costs are described for criterion of minimal production costs and criterion of maximal productivity are described in next chapter. Practical part of this work is focused to apply each individual criterion in practical example. There is CD with programs attached to this work. The goal is to find optimal combination of cutting speed, sufficient life time of cutting tool and suitable cutting technology so that chosen criterion can be acceptable.

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23

Šikula, Josef. "Analýza operačních nákladů obráběcího procesu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318157.

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This master’s thesis deals with the operating production cost in machining process and further optimalization. Individual costs items which are related to machining process are specified. Attention is paid to the time consumption of individual machining methods. The aim of the thesis is to find an optimal combination of cutting speed and durability in order to meet the minimum cost criteria and maximum productivity. The calculations are used for turning the outer cylindrical surface and the face surfaces at a constant cutting speed. The work is accompanied by tables and calculations in Microsoft Excel.

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24

Adamec, Petr. "Návrh zefektivnění přípravy výroby u vybrané technologie." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228171.

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Object of this dissertation work is increase of productivity capacity and labour productivity by welding process. This increase can be achieved by substitution of manual welding MIG and TIG for automatic welding line. So we can achieve the optimization of time schedule for the production of one piece and reduction of laboriousness of each production operation. The object of welding process are aluminium alloys - EN AW 6060 and EN AW 6063.

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25

Janál, Michal. "Studie řízení zásob ve výrobním podniku." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2007. http://www.nusl.cz/ntk/nusl-221523.

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The master’s thesis deals with study of the supply management in production company Česká zbrojovka, a.s. The theoretical solutions deal with spheres needed for determination of optimal supply of the specified materials. On the basis of an analysis of the actual state of affairs, conducted ABC analysis (analysis and calculation of the optimal supply for specified materials) contains the proposals and methods for economic order quantity for other inventory. The outputs of my thesis are the methods of the dealing with optimal supplies and the proposal.

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26

Hajný, Petr. "Studie optimalizace operativního řízení výroby." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2009. http://www.nusl.cz/ntk/nusl-222080.

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This master’s thesis solves the lean production’s methods implementation in the steps assembly department at the company IFE CR, a. s. The first part of the thesis describes the material and information flows and the most serious problems are identified in this part. On the basis of the analysis the optimized future state is designed and possible proposals of solutions are recommended to do for achieving this state. The solution of implementation of a new steps assembly line is solved in detail in the last part.

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27

Vach, Tomáš. "Návrh a výpočet sušicího zařízení pro dřevozpracující průmysl." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228021.

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The thesis considers a stabilization of temperature of a wood fiber during production of medium close fibre boards MDF in a wood-processing industry. The original purpose to solve energetic optimalization of a kiln dryer has become a serious problem. It turned out that production suffers with a big heat loss which results in big heat loss gained during a kiln drying. Primary aim of this thesis is an examination of a cooling effect of environment on chosen parts of a production line and suggestion of acceptable proceeding to minimize heat loss and to rise temperature of the wood fiber to required temperature. Solution is aimed on the section of a production line between drying equipment and press. First part of the thesis introduces technology of production of fibre boards, introduction to heat transfer problems and also basics of computer modeling of heat flow and transfer using CFD simulation. The next part includes an evaluation of the heat loss of chosen parts of the production line in a current working condition and its comparison with computer simulations. Verification of accuracy of the results while using both approaches to solution is a first step to the improvement of the current situation. It is possible to use the verified calculation model for the following solution of effects on convective and radiation heating of a wood fiber layer. An important factor in the last period of a calculation is a real temperature of the fiber board-mat at the entrance to a press. The higher entering temperature in a set temperature range is reached, the lower time needed for pressing will be and simultaneously the whole industrial process will be cut short. The solution of a problem leads to an achievement of an energy saving and should become a solid basis from which it would be possible to evaluate an improvement of production of MDF boards. The conclusion of the thesis includes an analysis of findings which refers to a heating of wood fiber and it’s effectiveness for a practical use.

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28

Ke, Huei-Jing, and 柯惠菁. "Optimalization for keratinase production on feather by Meiothermus strain I40." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/89072699003089208140.

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碩士
國立高雄海洋科技大學
水產食品科學研究所
93
Meiothermus pingtungensis sp. nov. I40 (I40) isolated from hot spring is a newly identified bacterium, and is able to degrade the feather keratin. The objective of this study is to determine the optimal medium compositions and incubation condition, for the production of keratinase maximal using Plackett-Burman design and response surface methodology (RSM). The degradation rates of feather by I40, was almost disintegrated under the 6 days incubation of I40 at 55˚С. The crude keratinase was isolated from the centrifuged and used in the following studies. The optimum pH for crude keratinolytic activity was at 8.5; optimum temperature at 70˚С. The crude enzyme was stable under 70˚С for 1 h, and the enzyme showed 18% activity at 80˚С for 1 h. Storage of the crude keratinase for 10 days, the enzyme exhibited more than 80% activity at -20 or -80˚С, whereas 60 % activity at 4˚С. Moreover, of the enzyme showed an apparent molecular mass at 243 and 172 KDa on SDS-PAGE and activity staining analysis. Nine medium compositions were used to study their effect on I40 using Plackett-Burman design. The production of biomass for I40 was affected in order of yeast extract, tryptone, glucose, and production of protease affected in order of feather, tryptone and yeast extract. According to the above results, feather, tryptone, yeast extract as well as incubation time and temperature were selected for further studies by RSM. Data obtained showed the maximal biomass production and keratinase activity occurred at above 96 h. From the commercial consideration, the incubation time was fixed at 3 days and reinvestigated by RSM. The maximal keratinase activity was obtained from the following condition: tryptone 0.16%, yeast extract 0.27%, feather 0.08%, incubation temperature 51.7˚С. The keratinase activity 20 U/mL obtained from RSM study was 13.3 folds higher than that from the original incubation condition, and the incubation time shorten from 5 days to 2 days.

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Chen, J. S., and 陳建興. "On the Process Evaluation and Quality Control of the Production of A356 Wheel Castings." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/55179280884423431273.

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碩士
國立臺灣大學
機械工程學系
85
abstract The production processes of A356 Al-wheels in a specific foundry was evaluated in this study. The process standardization was proposed for that specific foundry based upon the evaluation results. A rotary impeller degasser is currently used for the degassing treatment in the foundry. The degassed melt contained commercially accepted low gas level. However, the gas content of the melt increased gradually with increasing holding time, and the gas content reached an unacceptable level after holding for over 90 minutes. The microstructures of the Al-wheels currently produced in the foundry were thoroughly analyzed with the results indicating that substantial shrinkage porosity was present in the central portion of the rim section of the Al-wheels. Failing to maintain a directional solidification pattern and/or high enough temperature gradients were found to be responsible for the formation of the porosity defect. Modifying the ingate design and employing forced cooling at the central rim section were suggested for the elimination of this porosity defect. Furthermore, the feasibility of reducing the section thickness of the as-cast Al-wheels was evaluated in this study by using tensile and impact properties as the criteria. The results show that the original thickness of rim section of 10- 15㎜ can be reduced to around 9㎜. Also, accompanying with the reduction of section thickness, the T6 solution time at 540℃ can be shortened to 2-4hr from original 6hr and still obtains improved properties.

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30

Yaw, Jai Chiou, and 邱曜嘉. "The Study on the Production of the A356 Aluminum Alloy Brake-Oil-Pump Housing Castings by the Evaporative Pattern Casting Process." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/17241891860737838253.

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碩士
國立臺灣大學
機械工程學研究所
87
The aim of this research is to establish the optimal processing parameters which are required for manufacturingsound EPC A356 brake-oil-pump housing castings. The processing parameters studied include the gating system design, the pattern material, the coating thickness, the GFN of molding sand , the application of a vacuum and the pouring temperature. The optimal conditions have been respectively established for various gating systems ranging from one layer-one casting system (Type A) to tow-layer-six casting system (Type E). The mold filling behavior of the gating system Type E has been thoroughly analyzed, with the results indicating that though the metal flow follows essentially a sequential pattern, the majority of the first incoming melt (approximately 70%) enters the lower layer. This is due primarily to the relatively large metallostatic head and the cross sectional area of the sprue used in this study. In addition, the previously derived EPC Al flow-solidification equation has been slighly to modified to calculate theoreticlly the flow length of a pipe-shape casting, similar to the pump housing casting studied herein. The calculated flow lengths are in agreement with the experimental results. The relationship between the %porosity and the processing parameters has also been investigated. The results show that raising the pouring temperature increases the porostiy content. Also, employing PMMA pattern material results in less porosity than adopting EPS pattern material. Howwver, changes in gating system design and GFN of the molding sand have little effect on porosity content. Microstructural analyses show that the as-cast eutectic Si exhibits a partial modification structure (3-4 modification degree). This is due to the presence of about 0.026%Sr in the A356 ingots used and the relatively thin section of the casting studied. The SDAS is affected mainly by the local solidification cooling rate of the castings. Two principal types of porosity porosity defects were observed in the castings, namely the pyrolysis porosity defects caused by the decomposing pattern and the microshrinkage defect.

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31

HORÁK, Pavel. "Řízení zásob v mlékárenském průmyslu." Master's thesis, 2008. http://www.nusl.cz/ntk/nusl-85582.

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Analysis of the situation and the movements of stocks in selected dairy product line and s proposal for measures to reduce the capital intensity in stocks and an increase the quality of supply of services. Analysis of manufactured products by ABC method.

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