论文部分内容阅读
用于高温工作的轴承,必须经过特殊热处理,目前多采用200℃回火,但导致轴承套圈硬度急剧下降,因而也大大降低了轴承的使用寿命。通过试验证明,在高温下工作的轴承套圈,当淬火后经-60℃以下温度冷处理,再进行200℃3小时回火,工作过程中尺寸有较高的稳定性。锻造成环形毛坯经正火+退火预先热处理,套圈在淬火后能得到好的显微组织和很高的硬度,冷处理后套圈硬度普遍提高。经200℃3小时回火,套圈仍有很高的硬度,为Rc60。附图1幅，表3个。
Bearings for high temperature work, must be subjected to special heat treatment, the current use of more than 200 ℃ tempering, but lead to a sharp decline in bearing ring hardness, which also greatly reduces the bearing life. It has been proved through experiments that the bearing rings working under high temperature have high dimensional stability during working after being quenched and cooled at a temperature below -60 DEG C and then tempered at 200 DEG C for 3 hours. Forging into a ring blank by normalizing + annealing pre-heat treatment, the ring after quenching can get good microstructure and high hardness, hardness of the ring after cold treatment generally improve. After 200 ℃ 3 hours tempering, the ferrule still has a high hardness, Rc60. Figure 1, Table 3.