The Research Of Cam Grinding Algorithm Based On Synchronous Lag

As an important branch in the field of CNC grinding of the CAM or camshaft grinding isgradually towards the direction of high precision, high efficiency, high flexible rapiddevelopment, in the aerospace, military, automobile, textile and other fields, as power outputof the camshaft CAM or a key components, there is an increasing demand on the quality andquantity, the production technology level of CAM or camshaft grinding theory and researchbetter requirements are put forward.Different from the traditional to improve by increasinguniaxial control precision CAM contour precision of the method, is proposed in this paperbased on synchronous lag the contour error of cross coupling control strategy, aiming at thetracking error of each axis servo control system, adopt cross coupling error compensationcontrol model, two axis tracking error in coordination with the synchronization, the grindingpoint on the CAM contour relative lag, eventually reduce the CAM contour error and improvethe accuracy of numerical control CAM grinding.Simulation results show that the PID cross-coupling controller and adaptive PID neural network cross-coupling controller error of themaximum points on the contour error when reduced to50%and25%respectively, greatlyimproving the CAM grinding precision.This paper mainly completed the following researchwork:1. To establish the CAM axis relationship with the grinding wheel feed shaft grindingmathematical model, the CAM design data into the input data of CAM grinding machineinstructions.Based on the CAM lift data and contour data coordinates of X-C axis linkage ofmathematical model, according to a given CAM lift data, combining two kinds of modelderivation method, on lift data curve fitting, on the basis of using the theory of inversionmethod and in turn the CAM outline curve and the actual contour curve and trajectory profilecurve grinding wheel center, relying on the Matlab software to write the data processingprogram, get the numerical control CAM grinding system needs the instruction of data.2. Put forward based on synchronous hysteresis of the CAM contour error model andcross coupling control compensation strategy.Analysis of single axis servo tracking errorinfluence and traditional contour of CAM grinding trajectory error modeling method.On thisbasis, put forward the CAM contour error model based on synchronous lagging ideas;At thesame time, the contour error of the cross coupling control model is put forward, and the distribution of error compensation are discussed.3. The design is based on the CAM contour error of cross-coupling controller.First USESthe classical PID controller as the cross-coupling controller and its parameterssetting.Considering the classical PID controller can’t achieve precise contour error control tothe real-time changes, put forward to realize parameter self-tuning adaptive PID neuralnetwork controller.The controller can according to the change of the contour error, real-timeadjustment of the size of the output control quantity, realize the precise control of CAMgrinding contour error.4. Build simulation platform, verify the cross coupling control strategy based onsynchronous lagging thoughts on the effectiveness of the CAM contour errorcontrol.According to the design of the classical PID controller and adaptive PID neuralnetwork controller, numerical control CAM grinding cross-coupling control simulationplatform.CAM grinding shaft order data based on a given, SIMULINK simulation experiment,the error control method with traditional engineering practice respectively, classical PID crosscoupling control cross coupling method and adaptive PID neural network control method ofthe CAM contour error curve, through comparing error curve analysis, two kinds of cross-coupling controller is verified on the effectiveness of the contour error suppression.In summary, the numerical modeling of kinematics two-axis cam contour grinding errorcalculation, the cross-coupled control compensation modeling and simulation platform basedon SIMULINK cam profile synchronization error lag structures and the effectiveness ofcontour error control in this topic verification aspects of the research. For still need furtherresearch to solve problems, mainly in the controller design for error control, and furtheroptimize the allocation algorithms and error compensation based on synchronous speedcontrol lag ideological cross-coupling control study.