金刚石砂轮磨削钛合金时的磨削力研究

Study on grinding force in grinding titanium alloy with diamond grinding wheel

为解决金刚石砂轮磨削钛合金时材料弹性模量低、弹性形变大等问题,从理论上对砂轮的受力状态进行分析。基于切屑分离准则和材料摩擦属性,构建钛合金磨削时的受力模型,并对单颗磨粒的受力状态进行有限元仿真。设计钛合金磨削加工试验,研究工艺参数变化对砂轮磨削力的影响规律。结果表明:砂轮磨削速度增加,磨削力逐渐降低;当进给速度和磨削深度增加时,磨削力增加。当磨削工艺参数改变时,砂轮的切向和法向磨削力的变化趋势大致相同,切向和法向磨削力的比值为0.29~0.37。且磨削力的理论值和试验值的变化趋势基本一致,二者相对误差的平均值在5%以内,验证了磨削力理论模型的正确性。

To solve the problems of low elastic modulus and large elastic deformation when grinding titanium alloy with diamond grinding wheel,the force of grinding wheel was analyzed theoretically.Based on the chip separation cri-terion and the material friction properties,the cutting force model of titanium alloy grinding was established,and the cutting force state of a single abrasive particle was simulated by finite element method.The grinding experiment of ti-tanium alloy was designed to study the influences of process parameters on the grinding forces of grinding wheel.The results show that the grinding force decreases with the increase of grinding speed.When the feed rate and the grinding depth increase,the grinding forces increase.When the grinding process parameters are changed,the change trend of tan-gential and normal grinding forces of the grinding wheel is roughly the same,and the ratio of the tangential and the nor-mal force is 0.29~0.37.The variation trend of the theoretical value of grinding force is basically consistent with the ex-perimental value,and the average value of the relative error between the two is within 5%,which verifies the correct-ness of the theoretical model of grinding force.