极薄磨削下磨屑形成机理探讨

The Mechanism of Chip Formation in Grinding under ultra-thin Cutting Depth

在极薄磨削的工艺性试验和对砂轮表面形貌检测的基础上，分析了磨粒刃与试件表面的作用关系和材料内部应力、应变的分布状态，给出了磨粒刃的模型，在此基础上对极薄磨削下单颗磨粒刃的磨屑形成机理进行了分析和探讨。

According to technological experiments on very thin depthgrinding and a measurement of the shapes of the grinding wheel,the magnitudes of the normal grinding force(Fn)and the tangential grinding force(Ft)as well as the relation between them are obtained.A model for a single grain edge is given. Based on the interaction between the single grain edge and the surface of a workpiece,the deformation and distribution of stress and strain on the sur-face layer of the material are analyzed. By a force analysis on a micro-element in the defor mation region,equations of motion have been derived.The mechanism of the chip formation is studied and it is shown that the greater part between the grain edge and the workpiece sur face is of sliding rubbing while only in a part where the grain edge is about to leave the work piece surface is the local deformation region in the material free from counterforce and great stress difference will occur。In this case,the material in the local region will escape and the chip is formed.