面向切屑形成过程的瞬时滚削力模型研究

Research on Instantaneous Hobbing Force Model for Chip Forming Processes

建立滚齿加工的时变滚削力模型是优化滚齿加工工艺参数、减少滚削力波动、提高加工精度的前提,面向滚齿切屑形成过程建立时变滚削力模型是提高建模精度的最直接的物理方法。针对干切滚齿的切屑形成过程,建立滚刀前刀面运动模型,利用MATLAB生成刀齿运动轨迹的动态链接库。基于SolidWorks进行三维布尔运算,提取未变形切屑几何特征,开发切屑几何模型动态链接库。通过C#调用MATLAB和SolidWorks动态链接库,实现三维运动仿真,进而构建多齿瞬时滚削力模型。通过YK3216CNC滚齿机进行样件加工,结合HNC-SSTT软件进行全行程电流检测,间接测量瞬时滚削力。仿真加工的瞬时滚削力与实测滚削力变化趋势基本一致,表明该模型合理、有效。

The establishment of time-varying hobbing force model in hobbing processes was the premise of optimizing hobbing process parameters,reducing hobbing force fluctuation and improving machining accuracy,where the model for hobbing chip forming processes was the most direct physical method to improve modeling accuracy.For the chip forming processes of dry gear hobbing,a model of hob rake face motion was established,and the dynamic link library of hob tooth motion track was generated by MATLAB.After that,three-dimensional Boolean operation was performed to extract geometric features of undistorted chips and to develop dynamic link library of chip geometric model based on SolidWorks.In addition,C#was used to call the dynamic link library of MATLAB and SolidWorks to realize three-dimensional motion simulation for building multi-tooth instantaneous hobbing force model.Indirected measurement of instantaneous hobbing forces was performed through prototype hobbing on YK3216CNC gear hobbing machine and full stroke current detection was carried out combined with HNC-SSTT software.The instantaneous hobbing forces of simulation machining are basically in accordance with the change trend of measured hobbing forces,which indicates that the instantaneous hobbing force model is reasonable and effective.