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木工机床刀片是由15mm厚的60Si_2Mn钢板冲压成形,刨制刃口进行热处理,最后精磨平面和刃口。要求热处理硬度HRC47～49。原工艺如图1所示。淬火加热在RJM-2.8—10A型电炉中进行,每炉装40件;回火在硝酸钠电炉中进行,每炉装一框。对按此工艺处理的100件刀片进行硬度检查,HRC均在36—38之间。由于淬火加热温度过高、时间长,使工件表面产生了严重的氧化脱碳现象,造成硬度降低。检查金相组织为魏氏体+珠光体+屈氏体。
Woodworking machine blades are 15mm thick 60Si_2Mn steel stamping, planing edge heat treatment, and finally fine grinding plane and edge. Require heat treatment hardness HRC47 ~ 49. The original process shown in Figure 1. Quenching heating RJM-2.8-10A type electric furnace, each furnace installed 40; tempering in a sodium nitrate furnace, each box fitted with a furnace. According to the process of processing 100 pieces of the hardness test, HRC are between 36-38. As quenching heating temperature is too high, a long time, so that the workpiece surface has a serious oxidation decarbonization, resulting in reduced hardness. Check the microstructure Wei Weizhi + pearlite + troostite.