• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 1995.10a
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• pp.57-68
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• 1995

A design methodology is applied for manufacturing the valve-spring retainer component. The design criterion is the forging load within the available press limit. Also, the final product should not have any geometrical defect. The rigid-plastic TEM has been applied to simulate the conventional five-stage manufacturing processes, which include mainly backward extrusion and heading process. Simulations of one step process from selected stocks to the final product shape are performed for a possibly better process than the conventional one.

• Transactions of Materials Processing
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• v.5 no.2
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• pp.145-155
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• 1996

The conventional five-stage forming processes of the valve-spring retainer are simulated using the rigid-plstiv finite element method. As a design criterion the improved process should satisfy the maximum forging load during processes within the loading limit of the available press and should not induce any geometrical defects. hollow bars are recommended as initial billets to skip the heading and piercing processes. Through various simulations it is found out that the one stage process results in less forging loads and better strain distributions.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2002.04a
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• pp.45-53
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• 2002

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2003.10c
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• pp.53-62
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• 2003