Assessment and Improvement of Elementary Force Computations for Cold Forward Rod Extrusion

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Date

2005

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King Fahd University of Petroleum and Minerals

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Manufacturing Engineering
(2003)
Opened in 2003 with the aim to graduate experts in the field of machine-production, our Department is among the firsts in our country to offer education in English. The Manufacturing Engineering program focuses on the manufacturing technologies that shape materials from raw materials to final products by means of analytical, experimental and numerical modeling methods. First Manufacturing Engineering Program to be engineered by Müdek, our department aims to graduate creative and innovative Manufacturing Engineers that are knowledgeable in the current technology, and are able to use production resources in an effective and sustainable way that never disregards environmental facts. As the first Department to implement the Cooperative Education Program at Atılım University in coordination with institutions from the industry, the Manufacturing Engineering offers a practice-oriented approach in education with its laboratory infrastructure and research opportunities. The curriculum at our department is supported by current engineering software, and catered to creating engineers equipped to meet the needs of the production industry.

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Abstract

Two commonly used analytical force computation methods for cold forward rod extrusion are evaluated by means of precise finite element computations. The upper-bound model by Avitzur based on the spherical velocity field and the model by Siebel based on a quasi-upper-bound solution are considered. It has been found that the pure deformation forces obtained by summing the ideal force and shear force terms deviate between +25% and -20% from the finite element solutions. Larger deviations, however, occur for the Coulomb-friction term in the container. A new model based on an elasto-static analysis combined with numerical analysis is suggested to compute this term. This new model supplies also the accurate pressure distribution within the container.

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Keywords

Analytical Force Prediction, Cold Forging, Finite Element Method, Forward Rod Extrusion, Mechanical Engineering, Metal Forming

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1

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Source

Arabian Journal for Science and Engineering

Volume

30

Issue

1 C

Start Page

83

End Page

102

URI

https://hdl.handle.net/20.500.14411/9194

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Scopus