Patent ID: 6318140
Filing Date: 2001-11-20
Classification: B21B,B21D,G01B

Abstract:
A method of manufacturing a laminated ring by severing a cylindrical drum, which comprises a sheet of maraging steel with welded opposite ends, into a plurality of rings of predetermined width, rolling said rings to a predetermined target circumferential length, correcting circumferential lengths of the rings, aging and nitriding the rings, and laminating the rings into a laminated ring for transmitting power in a continuously variable transmission, said method comprising the steps of:measuring a load applied to a circumferential edge of each of the rolled rings and a load applied to another circumferential edge thereof while supporting an inner circumferential surface of the ring and applying a tensile load in a direction to expand the ring; anddetecting the difference between circumferential lengths of the circumferential edges of the ring based on the difference between the loads applied to the circumferential edges when said difference between the loads is maximum.