PRODUCTION OF SLIDING MEMBER

摘要

PURPOSE:To produce a sliding member improved in toughness and fatigue strength by casting a sliding member from alloyed cast iron, exerting hardening treatment and tempering treatment, forming the surface part of a sliding part into specific structure and specific hardness. CONSTITUTION:A sliding member composed of alloyed cast iron comprising JIS FC20-FC30 equivalent cast iron components or containing 0.4-0.6wt.% Ni, 0.5-1.0wt.% Cr, and 0.5-1.0wt.% Mo is cast in a metal mold. Subsequently, this sliding member is released from mold and successively subjected to hardening treatment and tempering treatment, by which the surface part is formed into a mixed structure of ledeburite structure, obtained by metal mold casting and tempered martensite structure, or tempered sorbite structure, obtained by quench- and-temper treatment, and also surface hardness is regulated to >=HRC55. By this method, the sliding member improved in toughness and fatigue strength can be obtained. By using this sliding member for camshaft, scuffing resistance, pitting resistance, etc., can be improved.