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用金相显微镜及显微硬度计对凸台薄壁齿轮渗碳淬火后的显微组织及硬度进行分析。结果表明,凸台两端有效厚度差异大,在渗碳淬火时上下两端收缩变形不一致,导致内花键呈“锥度”变形,造成产品大批量报废。试验表明,采用热补偿法设计外补偿块,补偿上端凸台薄壁部位有效厚度,改善淬火时上下两端冷却差异,将凸台薄壁部位内花键热处理畸变(收缩量)由0.10 mm以上降低到0.05 mm以内,从而达到控制畸变目的。
The microstructure and hardness of the thin-walled gear after carburizing were analyzed by metallographic microscope and microhardness tester. The results show that the effective thickness difference between the two ends of the bosses is large, and the shrinkage deformation at the upper and lower ends is inconsistent during carburizing and quenching, resulting in “taper ” deformation of the internal splines, resulting in mass scrap of products. The experiment shows that the thermal compensation method is used to design the outer compensation block to compensate the effective thickness of the thin wall of the upper bosses and to improve the cooling difference between the upper and lower ends of the quench. The spline heat distortion (shrinkage) Reduced to less than 0.05 mm, so as to achieve the purpose of controlling distortion.