微晶刚玉磨粒磨削20CrMnTi钢的数值模拟研究

Numerical simulation study of 20CrMnTi steel based on single micro crystal corundum abrasive grinding

为了研究微晶砂轮磨削20CrMnTi钢的磨削性能与磨削机理,开展了单颗微晶刚玉磨粒高速磨削模拟试验。研究表明:磨削热使磨削表面产生较高温度,同时使工件表层生成较大变化的温度场梯度,造成表层的残余应力分布变化。此外,还着重阐述了磨削速度、磨削深度两个因素对温度、变质层深度、残余应力等物理量的影响机制。随着磨削速度和磨削深度的不断增大,磨削温度会增大;表面残余压应力却将逐渐减小,甚至可能转变为残余拉应力。随着磨削速度的增大,变质层深度先增大后减小。随着磨削深度增大,变质层深度增大。

To study the grinding performance and mechanism of 20CrMnTi steel with micro crystal grinding wheel, simulation test of high speed grinding of single micro crystal corundum abrasive was carried out. It shows that high temperature is caused by grinding heat on the grinding surface. At the same time, it generates a large temperature field gradient on the surface of the workpiece, resulting in the residual stress distribution. In addition, it also focuses on the effects of the two factors, such as grinding speed and grinding depth, on the physical variables such as temperature, depth of deteriorative layer, residual stress and so on. With the increase of grinding speed and grinding depth, grinding temperature will increase. However, the residual compressive stress of surface will gradually decrease, and may even be converted to residual tensile stress. With the grinding speed increasing, depth of deteriorative layer firstly increases and then decreases. With the grinding depth increasing, depth of deteriorative layer increases.