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195柴油机起动齿轮轴,原设计为45钢调质,由于45钢短缺,而用40Cr钢代替,要求调质硬度HRC22～28。 40Cr钢Ac_3点为780℃,常用850～870℃油淬工艺,由于车间油槽容量小,连续生产油温易升高,生产不安全。由于生产任务重,必须寻找以水代油的热处理工艺。经多次试验,我们采用了如下两种工艺。工艺1:盐浴炉加热,780℃,盐水冷至200℃左右空冷,硬度HRC54～57,经670℃回火后硬度HRC22～28。
195 diesel engine starting gear shaft, the original design for the 45 steel quenched and tempered, due to the shortage of 45 steel, and 40Cr steel instead of requiring hardness quenching HRC22 ~ 28. 40Cr steel Ac_3 point of 780 ℃, commonly used 850 ~ 870 ℃ oil quenching process, due to the workshop tank capacity is small, continuous production of oil easy to rise, the production is not safe. Due to heavy production tasks, we must find a heat treatment process to replace oil with water. After many tests, we have adopted the following two processes. Process 1: salt bath furnace heating, 780 ℃, brine cooling to about 200 ℃ air cooling, hardness HRC54 ~ 57, after tempering at 670 ℃ hardness HRC22 ~ 28.