齿轮热滚挤过程中滑动系数变化对齿形误差的影响

Influence on Profile Error of Gears by Changes of Slip Factor During Ausform Finishing

在齿轮热滚挤加工中 ,轮齿上的金属在强制挤压力的作用下沿齿面产生塑性流动 ,使齿形发生变化。若辊模设计不合理或加工方法不当 ,将影响工件齿轮的齿形精度 ,产生噪声 ,降低使用寿命。产生齿形误差的原因很多 ,本文从啮合理论的角度出发 ,分析双面无侧隙啮合过程中工件齿轮齿面的滑动系数变化 ,分别建立工件齿轮轮齿主、从动侧的滑动系数变化方程 ,分析其对齿形误差的影响。这对全面分析热滚挤的加工误差机理有重要的意义 。

During ausform finishing process of hardened gears, there is plastic displacement of metal on the tooth surface and the distortion of tooth profile .If the rolling dies are not preciously designed or the machining operation is not properly implemented, there is an influence on the profile accuracy, noise and service life of the workpiece gears. Many causes are found to contribute to the profile error of teeth, but this paper only focuses on, in engagement theory, the changes of slip factor on the surface of the workpiece gear, which is in double-flank engagement with tool gears without backlash. Then the equations of slip factor for driven side and follower slide of a tooth of the workpiece are elaborated separately. On the basis of this, the influence of the changes of slip factor on profile error is analyzed. This research proves to be helpful to analyze completely machining error in ausform finishing, and it provides an important parameter in profile design of rolling dies.