Abstract:

In order to imp rove the efficiency of curve grinding, the adap tive NC grinding of a curved surface is con-ducted by controlling the wheel path based on the equal-envelope height. During the grinding, an adap tive NC grinding mode is established according to the curvature of the curved surface, and the characteristics of the grind-ings at different curvatures are analyzed based on the comparison of the equal2interval NC grindings with different envelope heights. Then, a NC grinding experiment is carried out to investigate the effectiveness of the p roposed adap tive NC grindingmode bymeasuring the form error. Analytical results indicate that (1) the effect ofwheelwear on grinding p recision can be reduced by using a moving grinding point in the envelope2form grinding; (2) in the curve grinding with equal2envelope-height path, the moving interval between wheel paths can be regulated accord-ing to the actual curvature, thus imp lementing the adap tive NC curve grinding and imp roving the machining effi-ciency; (3) the imp rovement ofmachining accuracy can greatly decrease the path number in the p recise grinding of the curved surface with large curvature. Experimental results show that smooth curved surface can be p roduced by de-creasing the equal2envelope height to 1μm, with a form error PV of 0.1285mm within the range of 100mm ×40mm.

Key words: equal-interval path, equal-envelope-height path, arc-shaped grinding wheel, NC grinding