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过去我们对于高速钢刀具的使用寿命,只是在淬火时加以控制,对于回火就注意得不够。当时我们认为,主要的原因是淬火条件不好,温度达不到理想的要求。后来经过回火证明,淬火虽然重要,如果没有适当的回火操作,还是不能满足我们的要求的,而且它的红热切削寿命相差大很。所以高速钢刀具的回火是一件极重要的事。现在把我们对高速钢刀具采用多次回火的一些经验,介绍出来供大家参考。 (一)回火前情况刀具原材料的成分是:碳0.7～0.8％,钨18～20％,铬3.5～4.5％,钒1.0％,硫、磷都小于0.03％,锰0.3～0.4％。规
In the past we used for high-speed steel tool life, only to be controlled during quenching, the attention is not enough for tempering. At that time we think the main reason is the quenching conditions are not good, the temperature does not meet the desired requirements. Tempering later proved that, although important quenching, if there is no appropriate tempering operation, or can not meet our requirements, and its red hot cutting life difference is very large. Therefore, high-speed steel tool tempering is a very important issue. Now put our experience of using high-speed steel tool repeatedly tempering, introduced for your reference. (1) Before tempering The composition of the tool raw material is: carbon 0.7-0.8%, tungsten 18-20%, chromium 3.5-4.5%, vanadium 1.0%, sulfur and phosphorus both less than 0.03% and manganese 0.3-0.4%. regulation