Applying shell molding process to produce chilled cast iron, castings with low surface roughness and high size accuracy can be obtained and the castings can satisfy French PSA chilled cast iron standard. 该凸轮轴采用壳型铸造冷硬铸铁工艺方法,铸件表面粗糙度低、尺寸精度高,铸件材质性能满足法国PSA集团冷硬铸铁技术标准。