基于砂轮包络廓形的复杂曲面磨削刀轨计算

Tool Path Calculation of Grinding on Sculptural Surface Based on Grinding Wheel Enveloping Profile

复杂曲面数控磨削是一种重要的精加工手段,但当前都是采用砂轮的理论廓形进行编程。砂轮制造误差和磨损对加工精度影响较大,砂轮修形精度要求较高。提出基于砂轮包络廓形的复杂曲面精加工技术,其原理是通过检测砂轮发生包络作用的实效廓形,并采用最小有向距离算法进行基于砂轮包络廓形的复杂曲面数控加工刀位轨迹计算。在砂轮磨损后可以通过重新测量其包络廓形,按照磨损后的包络廓形重新进行刀位轨迹计算。该方法能有效的提高加工精度和加工效率,同时降低复杂曲面包络法磨削时对砂轮精度的要求。

The sculptural surface CNC grinding is an important means of finishing, but all current pro- gramming is based on the ideal grinding wheel profile. Wheel manufacturing errors and wear is a greater impact on machining precision and the precision of wheel dressing have relatively high expectations. So complex surface finishing based on the grinding wheel enveloping profile is put forward. The principle is detecting the grinding wheel enveloping profile and calculating tool path of NC machining on sculptural surface based on grinding wheel enveloping profile by minimal orientation-distance algorithm. After the grinding wheel wearing, we can remeasure its enveloping profile and recalculate the tool path. This method can improve the machining precision and the processing efficiency effectively, while reduce the requirements of precision of grinding wheel when it envelope grinding the sculptural surface.