Research On The High-speed Numerical Camshaft Grinding Automatic Programming System

Camshaft is a core component in the large-scale use of piston engine, it is atypical slim parts with the characters of contour complexity and poor rigidity.It’srole is to control the valve opening and closing movements, drive engine gasdistribution system, so that it can quickly and accurately handling the gas flow anddirectly affects engine performance.How to make camshaft machining high precisionand high efficiency has become a key technical problems to be solved.This paper described the characteristics of camshaft grinding process and theCNC grinding techniques that commonly used in modern industrial,themathematical models and new grinding methodology were also studied base on CNCgrinding.This paper studied the original lift’s standardize, the processing of themeasured lift and the compensated virtual lift’s contour smoothing problems basedon the least-squares fitting theory.The cam lift conversion model was established forthe different types of tappet and the roller tappet with different radius.This paper studies the cam error processing rules, including the selection andintegration of the error parts.The virtual profile can be established by a certainpercentage inverse compensation of the measured error of the cam lift,and the newNC code based on the smoothed virtual contour can improve the quality of thesubsequent parts.High-speed camshaft grinding automatic programming system were build by thetool of C++Builder6combined with MATLAB math functions.This software cangenerate X-C displacement data tables based on the original lift and basicmethodology parameters that can compensate the machining errors.An experimentwere processed using the NC code generated by this software, and the experimentalresult shows that the software can machine the qualified workpiece and the errorcompensation module can improve the accuracy of subsequent processed workpiece.