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一批加工机车连杆用的W18Cr4V长钻头(φ14×650mm),在高温盐浴炉加热时用辐射高温计连接电子电位差仪表测温,由于指示波动大,使100支钻头,因淬火温度过低,淬火回火后硬度仅为HRC59～60,钻头已磨削加工为成品才发现。而连杆材质为42CrMo,调质后HB 285～321。所以,这批钻头无法对连杆进行加工。高速钢淬火加热不足,可通过退火重新淬火来挽救,但在无保护气氛热
A group of machining locomotive connecting rod W18Cr4V long drill bit (φ14 × 650mm), when heated in a high temperature salt bath furnace with a radiation pyrometer connected electronic potential difference meter temperature, due to the instruction fluctuation, so that 100 drill bit, due to quenching temperature Low, quenching and tempering hardness of only HRC59 ~ 60, the drill has been grinding for the finished product was found. The connecting rod material is 42CrMo, quenched and tempered HB 285 ~ 321. Therefore, these drill bits can not be processed on the connecting rod. High-speed steel quenching lack of heating can be quenched by annealing to re-quench, but in unprotected atmosphere heat