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Consideration of Surface Formation & Cracking & Control by Isothermal Extrusion

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Consideration of Surface Formation and Cracking and Control by Isothermal Extrusion; Simulation of These Factors by the Finite Element Method

Terry Sheppard, Xianjian Duan and Xavier Velay Bournemouth University, United Kingdom

Track: DIE DESIGN AND TECHNOLOGY - Finite Element Method

ABSTRACT ---In this part, the finite element method (FEM) is first applied to predict
the phenomena of surface cracks and surface formation, which have significant
influence on surface quality. To predict the onset of surface cracks, the Cockcroft and
Latham criterion is used. This kind of information is very useful for the calculation of
forming limit. To study the influence of forming parameters on the occurrence of
surface cracks, the Taguchi method is adopted. For the prediction of surface formation,
both forward and backward tracing technologies are used to simulate the particle flow.
FEM is also used to design the isothermal extrusion process and improve die design.
Two types of methods based on finite element analysis are proposed to design the ram
speed profile for isothermal extrusion.

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