Abstract
Al-Zn-Mg-Cu super-high strength aluminum alloy is widely used in the aerospace and automotive industry. However, the extrudability of Al-Zn-Mg-Cu aluminum alloy is relatively poor compared with other series of aluminum alloys. The simulation of compound cold extrusion process of Al-Zn-Mg-Cu aluminum alloy was studied for the production of a double-cup workpiece with a deep wobbler hole in this paper. The effective strain and stress distribution of the alloy during cold extrusion were studied by Deform-3D simulation. The results show that the maximum stress was concentrated at the bottom of the deep hole. Cracks were easily to be occured near the bottom of deep-hole. Based on the experimental results, the processing route of the two steps with compound cold extrusion is more suitable than one cold extrusion for the production.
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