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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Computerized Cost Estimation For Forging Industry

Tunc, Mehmet 01 January 2003 (has links) (PDF)
In today&amp / #8217 / s life, companies are faced with the problem of providing quality goods and services at competitive prices. Cost estimation is a very important process for a forging company, as each time a quote is sent to a customer, the company earns or loses money depending on the results of the particular estimate. However, determining pricing for customer quotes is a matter of time consuming, detailed number of tasks repeated each time. Cost estimation software might do those tedious calculations and assist the estimator step by step to reach to a cost estimate in relatively short time. In this study, an interactive cost estimation software named Forge Cost Estimator, which performs the early cost estimation for forgings, has been developed. The program is aimed to be used by the cost estimators in hot forging companies. The software has various databases, which include material, forging and machining equipment data. The cost items defined in the forging work breakdown structure can be estimated by using different modules of the software and summed up in an additive structure by using the bottom-up costestimation method. For calculating the forge volume quicker and easier, a new volume estimation system named Easy-Volume, which is based on the volume fragmentation method, is proposed. The software can also guide the user in selecting the convenient forging production line. The software is written in MS Visual Basic 6.0. The developed program has been tested in a forging company and satisfactory cost estimations for several forgings have been achieved.
12

Desenvolvimento integrado de produto para forjamento

Brites, Fabiano da Silva January 2009 (has links)
Este trabalho tem como objetivo apresentar e aplicar uma metodologia de desenvolvimento integrado de produto para forjamento, baseada na integração efetiva do conhecimento científico e da prática industrial. Esta metodologia foi definida a partir de cinco fases, denominadas: Projeto Informacional, Projeto Conceitual, Projeto Preliminar, Projeto Detalhado e o Controle da Qualidade e Produção. Após detalhar cada fase, e visando avaliar a adoção da metodologia apresentada, foram realizados simulações físicas (em plasticina) e numérico-computacionais (através do Simufact.Forming 8.1) para um produto destinado a elevadores. Este produto, denominado grampo de 3/8”, é forjado a quente a partir de uma barra de aço ABNT/SAE/AISI 1020, porém apresenta falta de homogeneidade na largura da rebarba, o que acarreta desperdício de material e comprometimento de sua qualidade. Nesse sentido, foram dimensionadas – através do método de Drabing, diferentes geratrizes de seções circular, quadrada e hexagonal, bem como, uma pré-forma de seção circular, para posterior análise da largura da rebarba. Através da análise via software também foi possível estimar a força e energia requeridas ao processo de forjamento em cada geratriz e pré-forma simuladas, sendo os resultados comparados a outros métodos utilizados nesta estimativa. Ao final, pode-se verificar que os valores de força e energia obtidos através das simulações numérico-computacionais não apresentaram uma convergência com os demais métodos utilizados. E, com relação às geratrizes e pré-forma simuladas, não foi possível verificar uma diferença significativa dos valores de força e energia que pudesse inviabilizar a utilização de qualquer um destes sólidos como sendo a matéria-prima ao grampo de 3/8”. Nas simulações em plasticina e numérico-computacionais da largura da rebarba, em geral, foi constatado o mesmo comportamento da largura da rebarba para as diferentes geratrizes e pré-forma simuladas, apresentando comprometimento desta grandeza junto aos vértices do grampo de 3/8”. Porém, e a partir do custo de fornecimento da matériaprima de cada geratriz e dos resultados obtidos, pode-se prever que a geratriz de seção circular e a pré-forma são economicamente e tecnicamente mais viáveis do que as geratrizes de seção quadrada ou hexagonal. / This paper aims to present and implement a methodology for developing integrated product for forging, based on the effective integration of scientific knowledge and industrial practice. This methodology was defined by five stages, called: Informational Design, Conceptual Design, Preliminary Design, Detailed Design and Quality Control and Production. After detailing each stage, and to evaluate the adoption of the methodology presented, physical simulations were performed (with plasticine) and numeric-computational (by Simufact.Forming 8.1) for a product intended to lifts. This product, called Clamp 3/8", is hot forged from a bar AISI/SAE/AISI 1020, but shows a lack of homogeneity in the width of the fash, resulting in waste of material and commitment to quality. In this sense, were designed - by the method of Drabing, different billets of circular sections, square and hexagonal, as well as a pre-form circular section, for further analysis of the width of the fash. Through the analysis by software was also possible to estimate the strength and energy required to forging process at each billet and pre-form simulated, and the results compared to other methods used in this estimate. In the end, was can verify that the values of strength and energy obtained through numericcomputational simulations did not show a convergence with the other methods used. And, with respect to the billets and pre-form simulated, it was not possible to verify a difference in the values of strength and energy that could prevent the use of any of these solids as the raw material to clamp 3/8". In the physical and numeric-computational simulations about width of the fash, in general, was found the same behavior as the width of the fash for the different billets and preform simulated, showing commitment of this magnitude along the vertices of the clamp 3/8". However, and as the cost of providing the raw material of each billet and the results obtained, it is expected that the billet of circular section and pre-form is technically and economically more viable than the billets of a square or hexagonal section.
13

Desenvolvimento integrado de produto para forjamento

Brites, Fabiano da Silva January 2009 (has links)
Este trabalho tem como objetivo apresentar e aplicar uma metodologia de desenvolvimento integrado de produto para forjamento, baseada na integração efetiva do conhecimento científico e da prática industrial. Esta metodologia foi definida a partir de cinco fases, denominadas: Projeto Informacional, Projeto Conceitual, Projeto Preliminar, Projeto Detalhado e o Controle da Qualidade e Produção. Após detalhar cada fase, e visando avaliar a adoção da metodologia apresentada, foram realizados simulações físicas (em plasticina) e numérico-computacionais (através do Simufact.Forming 8.1) para um produto destinado a elevadores. Este produto, denominado grampo de 3/8”, é forjado a quente a partir de uma barra de aço ABNT/SAE/AISI 1020, porém apresenta falta de homogeneidade na largura da rebarba, o que acarreta desperdício de material e comprometimento de sua qualidade. Nesse sentido, foram dimensionadas – através do método de Drabing, diferentes geratrizes de seções circular, quadrada e hexagonal, bem como, uma pré-forma de seção circular, para posterior análise da largura da rebarba. Através da análise via software também foi possível estimar a força e energia requeridas ao processo de forjamento em cada geratriz e pré-forma simuladas, sendo os resultados comparados a outros métodos utilizados nesta estimativa. Ao final, pode-se verificar que os valores de força e energia obtidos através das simulações numérico-computacionais não apresentaram uma convergência com os demais métodos utilizados. E, com relação às geratrizes e pré-forma simuladas, não foi possível verificar uma diferença significativa dos valores de força e energia que pudesse inviabilizar a utilização de qualquer um destes sólidos como sendo a matéria-prima ao grampo de 3/8”. Nas simulações em plasticina e numérico-computacionais da largura da rebarba, em geral, foi constatado o mesmo comportamento da largura da rebarba para as diferentes geratrizes e pré-forma simuladas, apresentando comprometimento desta grandeza junto aos vértices do grampo de 3/8”. Porém, e a partir do custo de fornecimento da matériaprima de cada geratriz e dos resultados obtidos, pode-se prever que a geratriz de seção circular e a pré-forma são economicamente e tecnicamente mais viáveis do que as geratrizes de seção quadrada ou hexagonal. / This paper aims to present and implement a methodology for developing integrated product for forging, based on the effective integration of scientific knowledge and industrial practice. This methodology was defined by five stages, called: Informational Design, Conceptual Design, Preliminary Design, Detailed Design and Quality Control and Production. After detailing each stage, and to evaluate the adoption of the methodology presented, physical simulations were performed (with plasticine) and numeric-computational (by Simufact.Forming 8.1) for a product intended to lifts. This product, called Clamp 3/8", is hot forged from a bar AISI/SAE/AISI 1020, but shows a lack of homogeneity in the width of the fash, resulting in waste of material and commitment to quality. In this sense, were designed - by the method of Drabing, different billets of circular sections, square and hexagonal, as well as a pre-form circular section, for further analysis of the width of the fash. Through the analysis by software was also possible to estimate the strength and energy required to forging process at each billet and pre-form simulated, and the results compared to other methods used in this estimate. In the end, was can verify that the values of strength and energy obtained through numericcomputational simulations did not show a convergence with the other methods used. And, with respect to the billets and pre-form simulated, it was not possible to verify a difference in the values of strength and energy that could prevent the use of any of these solids as the raw material to clamp 3/8". In the physical and numeric-computational simulations about width of the fash, in general, was found the same behavior as the width of the fash for the different billets and preform simulated, showing commitment of this magnitude along the vertices of the clamp 3/8". However, and as the cost of providing the raw material of each billet and the results obtained, it is expected that the billet of circular section and pre-form is technically and economically more viable than the billets of a square or hexagonal section.
14

Desenvolvimento integrado de produto para forjamento

Brites, Fabiano da Silva January 2009 (has links)
Este trabalho tem como objetivo apresentar e aplicar uma metodologia de desenvolvimento integrado de produto para forjamento, baseada na integração efetiva do conhecimento científico e da prática industrial. Esta metodologia foi definida a partir de cinco fases, denominadas: Projeto Informacional, Projeto Conceitual, Projeto Preliminar, Projeto Detalhado e o Controle da Qualidade e Produção. Após detalhar cada fase, e visando avaliar a adoção da metodologia apresentada, foram realizados simulações físicas (em plasticina) e numérico-computacionais (através do Simufact.Forming 8.1) para um produto destinado a elevadores. Este produto, denominado grampo de 3/8”, é forjado a quente a partir de uma barra de aço ABNT/SAE/AISI 1020, porém apresenta falta de homogeneidade na largura da rebarba, o que acarreta desperdício de material e comprometimento de sua qualidade. Nesse sentido, foram dimensionadas – através do método de Drabing, diferentes geratrizes de seções circular, quadrada e hexagonal, bem como, uma pré-forma de seção circular, para posterior análise da largura da rebarba. Através da análise via software também foi possível estimar a força e energia requeridas ao processo de forjamento em cada geratriz e pré-forma simuladas, sendo os resultados comparados a outros métodos utilizados nesta estimativa. Ao final, pode-se verificar que os valores de força e energia obtidos através das simulações numérico-computacionais não apresentaram uma convergência com os demais métodos utilizados. E, com relação às geratrizes e pré-forma simuladas, não foi possível verificar uma diferença significativa dos valores de força e energia que pudesse inviabilizar a utilização de qualquer um destes sólidos como sendo a matéria-prima ao grampo de 3/8”. Nas simulações em plasticina e numérico-computacionais da largura da rebarba, em geral, foi constatado o mesmo comportamento da largura da rebarba para as diferentes geratrizes e pré-forma simuladas, apresentando comprometimento desta grandeza junto aos vértices do grampo de 3/8”. Porém, e a partir do custo de fornecimento da matériaprima de cada geratriz e dos resultados obtidos, pode-se prever que a geratriz de seção circular e a pré-forma são economicamente e tecnicamente mais viáveis do que as geratrizes de seção quadrada ou hexagonal. / This paper aims to present and implement a methodology for developing integrated product for forging, based on the effective integration of scientific knowledge and industrial practice. This methodology was defined by five stages, called: Informational Design, Conceptual Design, Preliminary Design, Detailed Design and Quality Control and Production. After detailing each stage, and to evaluate the adoption of the methodology presented, physical simulations were performed (with plasticine) and numeric-computational (by Simufact.Forming 8.1) for a product intended to lifts. This product, called Clamp 3/8", is hot forged from a bar AISI/SAE/AISI 1020, but shows a lack of homogeneity in the width of the fash, resulting in waste of material and commitment to quality. In this sense, were designed - by the method of Drabing, different billets of circular sections, square and hexagonal, as well as a pre-form circular section, for further analysis of the width of the fash. Through the analysis by software was also possible to estimate the strength and energy required to forging process at each billet and pre-form simulated, and the results compared to other methods used in this estimate. In the end, was can verify that the values of strength and energy obtained through numericcomputational simulations did not show a convergence with the other methods used. And, with respect to the billets and pre-form simulated, it was not possible to verify a difference in the values of strength and energy that could prevent the use of any of these solids as the raw material to clamp 3/8". In the physical and numeric-computational simulations about width of the fash, in general, was found the same behavior as the width of the fash for the different billets and preform simulated, showing commitment of this magnitude along the vertices of the clamp 3/8". However, and as the cost of providing the raw material of each billet and the results obtained, it is expected that the billet of circular section and pre-form is technically and economically more viable than the billets of a square or hexagonal section.
15

Analysis Of Forging For Three Different Alloy Steels

Civelekoslu, Baris 01 December 2003 (has links) (PDF)
Forging is a manufacturing process which is preferred among the others in that, the final product shows more enhanced properties. The properties of the final product are directly related with the material used in the forging process. Main parameters such as forging temperature, number of stages, preform design, dimensions of the billet, etc. may be affected by the forging material. Alloys are one of the main areas of interest in the forging industry. The use of alloy steels may bring superior properties, especially in terms of strength and forgeability. In this study, three different alloy steels, which are hot forged in industry have been examined. The flow of the material, stress distribution, die filling and the effects of the process parameters on the forging have been investigated. Three industrial forging parts / M20 and M30 eye bolts and a runner block have been studied. Finite Volume Analysis of the forging process has been performed for carbon steels / C45 and C60 and alloy steels / a stainless steel X20Cr13, a heattreatable alloy steel, 42CrMo4 and a bearing steel, 100Cr6. The results of the simulations have been compared with the findings of the experiments carried out in a forging company. It has been observed that numerical and experimental results are in good agreement.
16

Geometric analysis of axisymmetric disk forging

Raub, Corey Bevan. January 2000 (has links)
Thesis (M.S.)--Ohio University, March, 2000. / Title from PDF t.p.
17

Computer modeling of flow lines and flaw migration in bulk deformation prcesses

Hattangady, Nitin V. January 1987 (has links)
Thesis (M.S.)--Ohio University, November, 1987. / Title from PDF t.p.
18

Academisk afhandling i svenska bergs lagfarenheten rörande författningarna vid Tysk- och Vallon-smidet i Sverige

Berch, Krister Lundström, Carl January 1900 (has links)
Uppsala universitet, 1780, Thesis (doctoral). / Goldsmiths'-Kress no. 11983.1-4. - OCLC, 24296230. - Reproduction of original from Kress Library of Business and Economics, Harvard University.
19

Development of cost estimation of equations for forging

Rankin, John C. January 2005 (has links)
Thesis (M.S.)--Ohio University, November, 2005. / Title from PDF t.p. Includes bibliographical references (p. 54-55)
20

Academisk afhandling i svenska bergs lagfarenheten rörande författningarna vid Tysk- och Vallon-smidet i Sverige

Berch, Krister, Lundström, Carl. January 1900 (has links)
Thesis (doctoral)--Uppsala universitet, 1780. / Reproduction of original from Kress Library of Business and Economics, Harvard University. Goldsmiths'-Kress no. 11983.1-4.

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