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汽车驱动桥准双曲面齿轮在研齿加工过程中经常出现齿面烧伤现象,这种缺陷将导致准双曲面齿轮在使用的过程中出现点蚀、剥落打齿等失效模式。本文提出的根据研齿烧伤部位的宏观特征辨别研齿烧伤的方法;从金相组织、硬度变化分析出齿面烧伤对齿轮寿命的影响,并进行了台架试验和道路试验验证。通过建立准双曲面齿轮啮合点相对滑动的数学模型,计算出各啮合部位的相对滑动速度,发现齿面烧伤部位正是相对滑动速度最大的部位。通过多轮研齿烧伤再现试验研究证明了零侧隙研齿是导致研齿烧伤的主要因素。结合生产实践经验,提出了研齿标准作业程序、研齿侧隙自动监控等抑制研齿烧伤方法。
Car drive axle hypoid gears often appear tooth burn in the process of grinding, which will lead to pitting, spalling and other failure modes in the process of using hypoid gears. In this paper, the method of identifying the tooth burns according to the macroscopic characteristics of the burned parts of the tooth is presented. The influence of the flank burns on the gear life is analyzed from the microstructure and hardness changes, and the bench test and the road test are carried out. By establishing the mathematical model of the relative sliding of the hypoid gear meshing point, the relative sliding speed of each meshing part is calculated. It is found that the burned part of the tooth surface is the part with the largest relative sliding speed. The research on the reproducibility of multiple rounds of dental burn proved that the zero-sidelash denture is the main factor leading to dental burn. Combined with practical experience in production, this paper proposes a standard operating procedure of grinding teeth, automatic monitoring of backlash of grinding teeth and other methods to restrain tooth burns.