Patent ID: 7131311
Filing Date: 2006-11-07
Classification: B21J,B21K

Abstract:
1. A method of forming a forging blank, comprising the steps of: loading a workpiece into a die assembly having an upper die and a lower die; actuating said upper die to press said workpiece loaded in said die assembly axially toward said lower die to cause material of an outer circumferential surface of said workpiece to flow into contact with an inner circumferential surface of said die assembly while pressing an end face of said workpiece against a placing surface of said die assembly which is substantially perpendicular to said inner circumferential surface thereof; displacing said upper die away from said workpiece; and thereafter, actuating said lower die to press said workpiece axially toward said upper die to cause a squeezer projecting from said inner circumferential surface of the die assembly to squeeze said outer circumferential surface of said workpiece so that said workpiece has a substantially constant diameter.