Software Design And Technical Study On Optimization For Command Of Camshaft NC Grinding

Compared to traditional mechanical processing by imitating the cam profile,CNC grinder, composed of the wheel reciprocating linear (X spindle) motion andworkpiece rotational motion (C spindle), can significantly improve the efficiency,precision and flexibility of camshaft grinding. However, there are still manytechnical problems of CNC camshaft grinding, especially how to improve theaccuracy and quality of the camshaft grinding. Based on the research status at homeand abroad of the optimization of CNC camshaft grinding code, this paper putforward a new optimization strategy for the lifts and C spindle rotational speed ofNC code for X-C spindle coupling CNC camshaft grinder, automaticly generateoptimized NC code to guide practice processing. It is designed mainly for middleranking numerical control machine tools to improve the camshaft grinder X-Cspindle coupling performance and tracking accuracy of servo axis to improve theaccuracy and quality of the camshaft grinding by reduce the grinding forcefluctuations and machine flutter of processing.It is necessary for the optimization of the lifts and rotational speed of NC codefor X-C spindle coupling CNC camshaft grinder by analyzing the camshaft CNCgrinding instruction affecting on processing error, especially the smoothness of liftdata and the cam rotation angle and workpiece rotational speed of NC code.Two new methods, high-end fitting of the exponential function and fivequasi-uniform B-spline alternating points interpolation method, for the optimizationof cam profile are proposed by theoretical derivation, according to previously studyon cam curve for optimization to fair the lift curve and filter out the bad points. Inorder to analyze the two algorithms of their advantages and disadvantages, and alsoapplications, the two algorithms are tested on the cam instance.Based on the mathematical model of camshaft grinding constant speed, a newspeed optimization method is proposed based on the sensitive cam pointsinterpolation of cubic spline, by optimizing the F instructions in the code of grindingto achieve workpiece speed real-time speed control requirements through controlingthe spindle speed, which drive low speed rotation of the workpiece. Sensitiveposition of cam are maxima speed and peach cusp, the rotational speed setting ofspindle depends on practical experience in the processing.The software is developed based on the C++Builder6.0and MIDEVA, according to the theory of lifts optimization and rotational speed optimization,successfully integrating into the camshaft grinding aided software. The softwaresuccessfully calls for a powerful numerical tool of Matlab by C++Builder andMatlab hybrid programming. The actual processing on camshaft grinder is carriedout and the result of experiment showed that new algorithm can improve surfacequality significantly and reduce processing error.