The Key Technical Study Of Error In Onposition Measuring And Compensation Of Camshaft NC High-speed Grinding

Energy saving and environmental protection is the theme of today’s automobileindustry development. As a core component for Automobile and internalcombustionengine, The machining quality and the profile error not only has a serious effect onthe reliability of the fuel injection pump, but also directly determines theperformance of the fuel system. With the increasingly strict of Global emissionsmethod and the design of the national new camshaft design standards, it promotes thefuel system tending to be higher pressure, higher speed and faster responsiveness inthe direction of development, and it puts forward higher requirement to the processingquality of cam contour.Based on the research status at home and abroad of the camshaft grinding erroranalysis and compensation, this paper designs a set of CAM contour in the onpositionmeasuring system based on USB bus, and analyze the signal processing circuit such asdenoising, filter of the measurement system, and also discusses various interferencefactors affecting reliability and accuracy of the measurement system. The reliabilityand precision of the measurement system is validated by doing comparativeexperiments on the CAM profile measuring instrument which measured in offline.This paper puts forward a new error analysis and compensation strategy for XCaxis linkage of the CNC8325ultrahigh speed camshaft grinder. Onposition measuringthe processed cam contour lines after one or more trial grinding, and analyzing theentire system’s processing error which was stable and repeatable, the virtual camprofile was constructed on the basis of the error, which was used to control thegrinding point trajectory. This method can effective reduce the grinding processsystem error’s influence on the quality of the followup parts.This paper uses orthogonal test to design experiments, and uses the range methodand variance method to analyze the influence of process parameters on the machiningquality. A nonlinear mapping relationship is established between the machiningquality and process parameters by genetic neural network algorithm. Results showthat the genetic neural network algorithm is improved and the grinding parameters areoptimized. It also appropriate process parameters for camshaft grinding experiments.Based on the theory of least squares polynomial and software programming,automatic selection and analysis of the error law was achieved. In this paper, theautomatic error analysis and compensation research was finished by building the virtual cam profile which was indirectly constructed by building virtual lift.The software module of processing error onposition measuring and compensationof camshaft was developed based on C++Builder, and the software has goodoperability because of the excellent user interfaces and a number of auxiliaryfunctions, and it can be used to guide the actual processing better.The correctness of the error analysis and compensation theory was verified by theexperiments. The results show that the theory has good feasibility, the processingprecision and quality of the camshaft could be effectively improved.