基于砂轮均匀磨损的曲面磨削研究

Research on Curved Surface Grinding Based on Uniform Wear of Wheel

磨削模具曲面时,工件曲面形状在数控插补下由圆弧砂轮的截面包络叠加而成,因此曲面的形状误差主要取决于砂轮的形状精度和系统刚度。按照单位磨粒参与磨削时间相同的原则,建立了砂轮均匀磨损的模型,根据曲率半径的不同,得出相应的砂轮进给速度。通过磨削0.5 mm的余量后,砂轮整体的磨损量约有0.17 mm,采用变速均匀磨损法,砂轮的局部法向误差由0.033 mm降为0.0239 mm,可减小约30%的局部磨损。

When grinding curved surface using arc grinding wheel, the shape of workpiece surface is formed by the overlapping of arc grinding wheel under the numerical control interpolation. So the shape error of the surface depends mainly on the shape accuracy and the system stiffness of the grinding wheel. According to the principle that the unit abrasive grains participate in the same grinding time, a uniform wear model of the grinding wheel is established. According to the different radius of curvature, the corresponding grinding wheel feed rate is obtained. After grinding the remaining amount of 0.5 mm, the overall wear of the grinding wheel is about 0.17 mm. Using the variable speed uniform wear method, the local normal error of the grinding wheel is reduced from 0.033 mm to 0.0239 mm, which can reduce the local wear of about 30%.