论文部分内容阅读
淬硬轴承套圈精密硬车加工过程中的装夹变形会导致零件材料去除率不均匀,从而影响加工精度,导致圆度超差。建立了轴承套圈等薄壁圆环类零件在三爪卡盘装夹下的弹性变形理论模型,并与有限元模型做对比。结果表明,理论模型和有限元模型对最大弹性变形有相似的预测精度,同时发现,即使使用很小的装夹力,薄壁圆环类零件也会发生较大的径向弹性变形。因此提出可以采用轴向夹持方式(如电磁卡盘)减小甚至消除装夹过程中的径向弹性变形,从而降低圆度误差。
Hardened bearing rings precision hard car machining process of clamping deformation will lead to uneven material removal rate, thus affecting the machining accuracy, resulting in roundness tolerance. The theoretical model of the elastic deformation of thin-walled annular parts such as bearing rings and the like is set up under the clamping of the three-jaw chuck, and compared with the finite element model. The results show that the theoretical model and the finite element model have similar prediction accuracy to the maximum elastic deformation. At the same time, it is found that the thin-walled annular parts will undergo large radial elastic deformation even with a small clamping force. Therefore, it is proposed that axial clamping (such as a magnetic chuck) can reduce or even eliminate the radial elastic deformation during clamping, thereby reducing the roundness error.