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砂轮割刀见图1,材质为45钢,有效厚度2mm。技术要求:硬度HRC52～55,淬火后不允许有椭圆扭曲变形及裂纹。原采用的热处理工艺:840±10℃中温盐炉加热,保温4h(夹具装挂),淬入5～10％NaCl水溶液,水温≤40℃,220±10℃低温硝盐回火2h,空冷。处理结果:合格率60～G5％,其余椭圆变形扭曲占23～30％,淬裂报废5～10％。对椭圆变形者须退火后校正再重新淬火,
Grinding cutter shown in Figure 1, made of 45 steel, the effective thickness of 2mm. Technical requirements: hardness HRC52 ~ 55, after quenching does not allow elliptical distortion and cracks. The original heat treatment process: 840 ± 10 ℃ medium temperature salt furnace heating, heat 4h (fixture mounted), quenched into 5 ~ 10% NaCl aqueous solution, water temperature ≤ 40 ℃, 220 ± 10 ℃ low temperature salt nitrate tempering 2h, air cooling. Processing results: pass rate of 60 ~ G5%, the remaining distortion of elliptical deformation accounted for 23 to 30%, quench cracking scrap 5 to 10%. Oval deformation of those who need to be annealed and then re-quenched,