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开发了一种采用树脂砂壳型铸造的激冷球铁凸轮轴。其非激冷区的显微组织由珠光体、少部分渗碳体和细小球状石墨组成;激冷区由初生渗碳体,共晶莱氏体(转变为珠光体和渗碳体)和极少量点状石墨组成。未激冷基体硬度为280～350 HBS,凸轮的激冷硬度和深度分别达到58 HRC以上和5～10 mm,非激冷区的基体抗拉强度超过550 MPa。
A chilled ductile iron camshaft molded from resin-sand shell has been developed. The non-chilled zone microstructure consists of pearlite, a small part of the cementite and fine spherical graphite composition; chilled zone by the primary cementite, eutectic ledeburite (transformed into pearlite and cementite) and pole A small amount of punctate graphite composition. The uncooled substrate hardness is 280-350 HBS. The chilled hardness and depth of the cam are above 58 HRC and 5-10 mm, respectively. The tensile strength of the substrate in the uncooled region exceeds 550 MPa.