小模数螺旋锥齿轮几何误差的主动控制

Active Control of Geometric Errors of Small Module Spiral Bevel Gears

针对小模数螺旋锥齿轮结构尺寸较小,用传统测量和反调的方法控制几何误差不易操作,很难对其齿形及齿厚进行严格控制的情况,提出了小模数螺旋锥齿轮通过控制机床各轴误差和刀盘几何误差进行间接控制齿轮几何误差的方法。建立了螺旋锥齿轮齿形、齿厚偏差与机床位置误差和刀具几何误差的关联模型,分析了两者之间的影响规律;根据影响规律控制机床各轴和刀盘的误差精度,完成了切齿实验、齿形测量及齿侧间隙测量实验。理论分析及实验结果表明:该方法可使螺旋锥齿轮齿形齿厚偏差得到严格控制。

Aiming at the problem of small modulus spiral bevel gears,because of their small size,it is difficult to control geometric errors by traditional measurement and inversion methods,and it is difficult to control their tooth profile and tooth thickness strictly. This paper presents a method of indirect control of geometric errors of small modulus spiral bevel gears by controlling the axis errors of machine tools and the geometric errors of cutter head. The correlative model of helical bevel gear tooth profile and tooth thickness deviation with machine tool position error and tool geometry error was established,and the influence law between them was analyzed. According to the influence law,the error precision of each axis and cutter head of machine tool was controlled,and the experiments of cutting teeth,tooth profile measurement and tooth side clearance measurement were completed. The theoretical analysis and experimental results show that the deviation of tooth profile and tooth thickness of spiral bevel gears can be strictly controlled by this method.