METHOD FOR PROLONGING SERVICE LIFE OF TOOL SUCH AS MANDREL AND FORMING DIE, AND TOOL OF PROLONGED SERVICE LIFE SUCH AS MANDREL AND FORMING DIE

摘要

PROBLEM TO BE SOLVED: To provide various kinds of tools such as mandrel and forming die for cold rolling whose service life is prolonged by modifying the steel surface of a forming part or a working part of the tools. SOLUTION: In a method for prolonging the service life of the tools such as mandrel and die, the steel surface of the forming part or the working part of the tools, and then shot-peened. COPYRIGHT: (C)2003,JPO