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采用有限元模拟和试验研究相结合的方法对倒档直齿轮冷精整成形中凹模和齿件的弹性变形规律进行研究。分别沿齿形方向和齿向方向对凹模和齿件的弹性变形特点进行分析,并将两者综合预测冷精整齿件的尺寸偏差。结果表明,凹模和齿件的弹性变形量沿渐开线齿面呈空间不均匀分布的特性是导致齿件精度低的主要原因。为实现直齿轮的精度控制,提出一种基于厚壁圆筒理论的齿形模具修正方法,利用应力外圈的预应力作用实现模腔修正,并进行试验研究,结果表明模具修正后的试验齿件的尺寸精度达到国标IT6级。
The finite element simulation and experimental research are used to study the elastic deformation of concave die and tooth in the cold finishing of reverse spur gear. The elastic deformation characteristics of the die and the tooth are analyzed along the direction of the tooth and the direction of the tooth respectively, and the two are combined to predict the size deviation of the cold-finished tooth. The results show that the main reason that the elastic deformation of the die and the tooth are unevenly distributed along the involute tooth surface is the main reason for the low precision of the tooth. In order to realize the precision control of spur gear, a method of correcting tooth profile based on the theory of thick-walled cylinder was proposed. The cavity modification was carried out by the prestressing effect of the stress outer ring and the experimental study was carried out. The results showed that the modified test tooth The dimensional accuracy of the pieces reached the national standard IT6 level.