非圆曲面零件X-C恒磨除率变速磨削研究

Variable speed grinding for non-circular surface parts X-Cconstant removal rate

为实现非圆曲面零件X-C恒磨除率磨削,将磨除率分解为磨削点的移动速度、磨削接触弧长及工件宽度的乘积;通过改变C轴转速调整磨削点移动速度,实现恒磨除率磨削。因为X,C轴速度沿磨削点切线速度分量存在耦合,所以首先建立了非圆曲面磨削X-C联动速度关系模型,并据此提出了磨削点移动线速度计算公式;分析了非圆曲面磨削过程中接触弧长的变化情况,提出了磨削点处曲率圆与砂轮相交弧长代替磨削接触长的近似计算方法。以平底推杆凸轮加工为例,在数控凸轮轴磨床上进行了凸轮恒角速及恒磨除率变速磨削试验。实验结果表明,非圆恒磨除率变速磨削方法提高了磨削力的平稳度,从而提高了加工质量。

To achieve constant removal rate processing for non-round parts X-C linkage grinding, grinding removal rate was decomposed into the product of grinding point movement speed, the grinding contact arc and the parts width; the C-axis speed was adjusted based on grinding point movement speed to achieve constant removal rate grinding. The grinding point movement speed formula was developed based on X-C linkage grinding speed relation ship model. To calculate the grinding arc length, the intersect arc length between the curvature circle and the wheel was introduced to instead of the grinding contact length. Taking the flat cam grinding for example, the constant an gular velocity and constant removal rate grinding were carried out on CNC camshaft grinder. The results showed that the constant removal rate of grinding variable speed grinding method could keep the grinding force more stable and improve the processing quality of non-round parts X-C linkage.