论文部分内容阅读
五十年代后,燃油泵凸轮轴逐渐用中碳钢感应加热淬火代替渗碳钢渗碳淬火。但是,45钢感应加热淬火后硬度低(仅HRC54～58),耐磨性比渗碳钢差,寿命也低。目前国内外仍有不少工厂采用渗碳淬火工艺。我厂生产的B_Ⅱ型燃油泵凸轮轴是采用精选45钢(0.44～0.49%C)进行感应加热淬火制造的,故决定凸轮轴使用寿命的主要因素是凸轮表面的耐磨性和接触强度。众所周知,一般钢的硬度高,其耐磨性也好。通常含碳量大于0.55%的中碳钢,感应淬火后硬度可达HRC62～64,耐磨性比20Cr钢经渗碳淬火的高。文献[1]的应力测定数值表明,含碳0.6～0.7%的碳钢感应
After the fifties, the fuel pump camshaft induction hardening instead of carbon steel induction hardening instead of carburizing carburizing quenching. However, 45 steel induction hardening hardness after quenching (only HRC54 ~ 58), wear resistance than carburizing steel, life expectancy is low. At present, there are still many factories at home and abroad using carburizing and quenching process. The B_Ⅱ fuel pump camshaft produced by our factory is manufactured by induction heating quenching with selected 45 steel (0.44 ~ 0.49% C). Therefore, the main factor that determines the service life of the camshaft is the wear resistance and contact strength of the cam surface. As we all know, the general hardness of steel, its wear resistance is also good. Usually carbon content of more than 0.55% of carbon steel, induction hardening hardness up to HRC62 ~ 64, wear resistance than 20Cr steel by carburizing high quenching. The value of stress measurement in [1] shows that carbon steel with carbon content of 0.6 ~ 0.7% is induced