HOLLOW HIGH RIGIDITY MEMBER

摘要

PROBLEM TO BE SOLVED: To inexpensively provide a high rigidity hollow member which is made of composite sintered steel comprising hard grains such as carbides and borides.;SOLUTION: A powdery mixture 1 is compacted with a core 2, as a center core, which has a collar part 2a and is made of a material having satisfactory machinability such as soft steel, is sintered, is thereafter subjected to extrusion working, and is subsequently subjected to drilling and finish working, so that the hollow member of the composite sintered steel having stably high fatigue strength and rigidity can inexpensively be obtained.;COPYRIGHT: (C)2004,JPO