端面磨削加工工件表面材料的去除机理

Workpieces’Surface Material Removal Mechanism of Disc Grinding

就端面磨削加工中材料去除不均匀、平面度不达标现象,提出了一种多磨粒材料去除率的计算方法.首先,在考虑磨粒尺寸、位置的前提下,建立了端面磨削砂轮表面磨粒分布的数学模型.其次,推导了多磨粒在工件表面的动力学轨迹方程,并在此基础上建立了工件表面材料的去除率模型.最后,通过实验验证了所提方法的合理性.结果表明,端面磨削工件表面去除效果呈现一定的不均匀性,往往中心位置区域去除率较低,形成了"中凸"现象,且工件表面轮廓的高度差随着转速比的增加而增大,可在加工过程中适当降低转速比,以提高工件表面轮廓的一致性.

In terms of the uneven removal and substandard flatness on the workpiece’s surface in disc grinding,a calculation method with multiple grits’removal rate was proposed.Firstly,a mathematic model for the disc wheel’s grits’distribution was established considering the grits’sizes and the positions.Then,the multiple grits’dynamic trajectory equation was deduced.Meanwhile,the workpiece’s removal rate model was established on this basis.The rationality of the model was further validated by the experiment of disc grinding.The results show that the removal effect appears to be uneven on the workpieces’surfaces of disc grinding.It is the lower removal rate that leads to the embossment phenomenon in the central location.Moreover,the height difference of ground workpieces’surface profile goes up with the increase of the speed ratio.Therefore,it is advisable to reduce the speed ratio so as to improve the consistency of the ground workpieces’surface.