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前言 GCr15钢制造的轴承套圈,经热处理淬火工序时,由于工艺规范不当:如淬火加热温度偏低、保温时间不足、冷却不够、以及淬火前的原始组织不够理想等,往往会出现软点现象。所谓软点是淬火零件未达到标准所规定的硬度值。对轴承零件而言,就是经过淬火后其表面硬度值有一点或数点低于JB1255-81标准中所规定的HRC61。轴承套图表面一旦出现软点现象,即为不合格产品。软点如产生在轴承的滚道上,耐磨性和疲劳强度将降低,轴承的寿命将大大缩短。一、情况介绍近来我厂在生产3620调心滚子轴承外圈时、经热处理淬火后,发现有区域性软点。在该区域内,其硬度值低于HRC61,出现HRC48至60的硬度值,而在该区域外1～2
Foreword GCr15 steel bearing rings, the heat treatment quenching process, due to improper process specifications: such as quenching heating temperature is low, lack of insulation time, cooling is not enough, and the original organization before quenching less than ideal, often there will be soft spots . The so-called soft point quenching parts did not meet the standards set by the hardness value. For bearing parts, after quenching is the surface hardness of a little bit or a few points lower than the HRC61 JB1255-81 standards. Once the surface of the bearing sleeve soft spot phenomenon, that is substandard products. Soft spots, such as produced in the bearing raceway, wear resistance and fatigue strength will be reduced, bearing life will be greatly reduced. I. Introduction Recently, I plant in the production of 3620 Spherical Roller bearing outer ring, the quenched by heat treatment, found a regional soft spot. In this region, its hardness value is lower than that of HRC61, hardness value of HRC48 to 60 appears, and in the region outside 1 ~ 2