Method of manufacturing metal ring for endless metal belt

Abstract

A metal ring with smaller stress concentration is manufactured, and the manufacture and maintenance of a rolling roller for transferring a mesh-shaped unevenness to the metal ring is facilitated. A mesh-like unevennessis formed to the surface of an inner circumference rolling roller. This unevennessis formed by rotating the inner circumference rolling rollerat a predetermined speed, and moving a grinderback and forth in the axial direction of the inner circumference rolling rollerwhile biasing the grinder toward the surface of the rollerwith predetermined force. The grain size of the grinder is between #270 and #1000. When the inner circumferential surface of the metal ringis rolled using the inner circumference rolling roller, a mesh-like unevennessis transferred onto the metal ring. Since the mesh-like unevennessis formed by transferring the unevennesshaving been formed by the grinder, the pitch of the unevenness is narrow and random, thus the laminated metal ringexerts good lubricity. Moreover, by subjecting the metal ringto solution treatment and nitriding treatment, a metal ringhaving high compressive residual stress and enhanced toughness is formed.