窄深槽侧面接触区对磨削热分配的影响

研究了单层电镀CBN成型砂轮磨削窄深槽时,砂轮和窄深槽侧面接触区对磨削热分配和温度分布的影响。采用Malkin和Lavine的热分配模型,考虑材料物理性能随温度非线性变化,以及磨削力随磨削过程的变化,运用ANSYS单元生死技术对窄深槽磨削时的瞬态温度场进行三维有限元仿真。通过磨削实验研究了不同磨削深度时槽底区和槽侧面区的温度变化。将仿真结果与实验结果进行对比分析,结果表明,侧面接触区有对磨削热有二次分配的作用,部分传入工件的热量通过侧面接触区传入砂轮中,接触面积越大,传递的热量越多。因此在对窄深槽磨削区温度进行预测时,需要对热分配理论进行一定的修正,考虑侧面接触区的影响。

The Influence of Side Contact Area on the Grinding Heat Partition in Narrow Narrow Deep Groove

The influence of the side contact area on grinding energy partition and temperature distribution ofnarrow deep groove grinding with electroplated CBN form-grinding-wheel is investigated. The non-linear relationship between the physical properties of workpiece and the temperature and the change of grinding force in grinding process is considered,a three-dimensional finite element transient simulation for different grinding conditions is carried out by using ekill and ealive technology of ANSYS and the energy partition model by Malkin and Lavine. Grinding tests are carried out to investigate The temperature changes of the bottom area and side area of the groove in different grinding depth. The simulation results and experimental results are compared and analyzed. The results show that the side contact area plays the role as secondary distribution of grinding energy.A part of energy that distritibuted to workpiece is conducted to the wheel through the side conduct area.the energy conduct increases with the increase of contact area.Therefore,it is necessary to modify the thermal distribution theory in the prediction of the temperature of the grinding zone in the narrow deep groove,considering the influence of the side contact area.