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遵照毛主席关于质量第一的有关教导,我厂在党总支的领导下一年来狠抓了提高产品质量。最典型的一个例子,就是通过认真进行科学实验,解决了我厂长期末解决的“重要产品零件”的质量问题。这个零件的材料是30CrMnMoTiA,热处理淬火后要求硬度为HRC47～53。原来做法是:进厂的这种材料进行870℃加热,保温30分钟淬火,180℃～240℃回火,照理完全可达到淬硬的要求,可是经几次淬火回火,均未达到硬度要求,致使这个零件大量地被搁置下来。为了找出原因,挽救这批零件,我们在兄弟单位的协助下,对这些不能淬硬的零件,从材料进厂到淬火回火处理都作了仔细的、大量的金相分析工作,终于找到了淬不硬的原因:是由于材料进厂前进行了长时间的高温回火处理,所以得到了粗球状珠光体(见图1),而在淬火加热过程中,这些粗球状
Following Chairman Mao’s teachings on quality first, our factory paid close attention to improving product quality under the leadership of Party branch. The most typical example is through serious scientific experiments to solve the long-term solution of our factory “important product parts ” quality problems. The material of this part is 30CrMnMoTiA, the hardness after heat treatment quenching is HRC47 ~ 53. The original approach is: This material into the plant 870 ℃ heating, holding 30 minutes quenching, tempering 180 ℃ ~ 240 ℃, reasonable fully meet the requirements of hardened, but after several quenching and tempering, did not meet the hardness requirements , Resulting in a large number of parts to be shelved. In order to find out the reasons for saving these parts, we, with the help of our brothers, carefully and massively analyzed these non-harden parts, from materials entering the factory to quenching and tempering, and finally found The reason why the quenching is not hard: it is due to the material into the plant for a long time before tempering, so get a coarse spherical pearlite (see Figure 1), and in the quenching process, these rough spherical