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3M4926锉球机用的大锉板,其尺寸与技术要求如图1所示.大锉板的加热淬火以前我厂是采用一般热处理方法,即在75(瓦千)箱式电炉中装箱加热,加热温度为850～860℃,加热好后取出先水后油淬火,但经常发生淬裂不能使用,而且每班只能淬一块.从去年开始我厂试验采用快速加热淬火方法,经过一年多来的试验,结合厂内情况初步找出下列比较好的热处理工艺:
3M4926 rasp ball machine with large rasp, the size and technical requirements shown in Figure 1. Large rasp hardening heating Before the plant is the use of general heat treatment method, that is, in the 75 (thousands of thousands) box-type electric heating furnace packing , The heating temperature is 850 ~ 860 ℃, after heating the first out of the water after the oil quenching, but often quench cracking can not be used, and only a quenching a class. From last year I plant test using rapid heating quenching method, after a year More experiments, combined with the initial situation within the factory to find out the following better heat treatment process: