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CouplingWhen the lubrication effect of the bearing bush fails to meet the requirements, a variety of failure characteristics will appear.If the oil pressure is low, the part between the shaft and the bearing bush will cause dry friction due to direct contact and cause damage and damage to the moving surface. At this time, the shaft surface is blue.If the lubricating oil fails or the pressure cannot be built up, the moving surface will completely lose the protection of the oil film and directly contact for dry friction.When the temperature rises, the alloy layer of the bearing bush melts, and the phenomenon of “shrinking the bush” occurs when the machine stops in time. Failure to stop the machine in time will cause more serious damage to the parts.
Certain types of bearings that are really difficult to buy have no spare parts and have to be repaired after failure, especially imported bearings; bearings have minor damage, such as slight water rust during storage, and slight fretting abrasion during transportation. It is a pity that this type of situation is easy to repair and discard.In addition to economy, the repair of the coupling has its technicality, which requires the repairer to fully understand the corresponding technical requirements of the bearing, and the characteristics of the structure, process and material of the bearing and its parts, otherwise it is difficult to guarantee the bearing The repair has a satisfactory effect.
影响高碳铬钢滚动轴承零件使用寿命的主要材料因素及控制程度为：(1)钢在淬火前的原始组织中的碳化物要求细小、弥散。可采用高温奥氏体化630℃、或420℃高温,也可利用锻轧余热快速退火工艺来实现。(2)对于GCr15钢淬火后，要求获得平均含碳量为0.55左右的隐晶马氏体、9左右Ar和7左右呈匀、圆状态的未溶碳化物的显微组织。可利用淬火加热温度和时间来控制这种显微组织。