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汽门推杆是203发动机上一个较重要的另件。根据其工作特点,要求圆柱部分表面及与凸轮接触表面有很高的硬度,同时整个汽门推杆又要具有较好的韧性。因此在制造汽门推杆时,一般采用优质碳素结构鋼,圆柱部分表面进行高频淬火,与凸轮接触表面则堆焊耐磨层。按照设计要求,堆焊耐磨层的硬度应大于Rc45。我们采用合金铸铁作为堆焊材料,其化学成分如下:碳3.1～3.4％,硅2.2～2.35％,锰0.5～0.65％,
Valve push rod is 203 engine on a more important piece. According to the characteristics of its work, the cylindrical part of the surface and the contact surface with the cam have a high hardness, while the entire valve push rod but also have good toughness. Therefore, the manufacture of valve push rod, the general use of high-quality carbon structural steel, cylindrical part of the surface of high-frequency quenching, the contact surface with the cam surfacing wear layer. According to the design requirements, the hardness of surfacing wear layer should be greater than Rc45. We use alloy cast iron as a surfacing material, and its chemical composition is as follows: carbon 3.1 ~ 3.4%, silicon 2.2 ~ 2.35%, manganese 0.5 ~ 0.65%