Patent ID: 6279365
Filing Date: 2001-08-28
Classification: B21D,Y10T

Abstract:
A cold forging forming method for forming a three-dimensional hollow article comprising the following steps:a) placing an inner die into a die protecting member through an inner die insertion hole,b) positioning said die protecting member in a pair of half dies,c) heating an alloy with a low melting point to a molten state,d) pouring said alloy into said die protecting member containing therein said inner die,e) allowing said alloy to solidify to a solid state, so that said molten alloy fills all gaps on an external wall of a body of said inner die, thereby forming a seamless die cavity,f) inserting a metallic blank containing a polyurethane strip into said seamless die cavity, andg) forging said metallic blank into a shaped article with a forging press.