高精度锥齿轮冷闭式锻造齿模修形及加工电极设计

精密成形时弹性变形是影响锻件尺寸精度的重要因素。本文采用数值模拟的方法，以锥齿轮冷闭式锻造精密成形工艺为对象，模拟了锥齿轮的冷闭式锻造成形过程，揭示了在有预应力的工况下模具弹性膨胀变形及锥齿轮锻件出模后弹性回复的变化规律。根据模拟结果，分别绘制了模具弹性膨胀和锻件出模回弹后的齿形曲线。在定量分析了两者对齿轮精度的综合影响之后，运用反补偿法预先修正齿形凹模，并进行了齿模电极的设计。研究结果对齿轮精度的提高提供了重要参考。

Profile modification of cavity die and the electrode design for precision bevel gear in cold closed-forging process

Elastic deflection is an important factor to influence the accuracy of the formed component in precision forming. In this paper, the forming of bevel gear cold closed-forging process is represented by means of numerical simulation method. It disclosed, in the work state of having shrink ring, the variable law of die elastic expansion and gear spring-back when mould unloading. According to the simulation result, the gear tooth shape curves during the mould expansion and the gear elastic recovery are plotted respectively. Quantitatively analyzing the effect of two to the profile of tooth, the inversing compensation method is then put forward to modify the die cavity and the electrode is designed. The conclusion is valuable for improving the gear accuracy.