Dynamic Modeling,Simulation And Experimental Research Of Camshaft High Speed Grinding

With the continuous transformation and upgrading of China’s automobile industry,how to improve the processing quality and processing efficiency of key components such as camshaft is one of the key problems to be solved urgently at present.Because the camshaft belongs to the typical slender rod,its grinding performance is poor,at the same time,the non-circular contour characteristics of the cam,as well as the grinding mode of the CNC X-C two-axis coupled linkage point tracking,bring great challenge to the dynamic characteristics of the process system,easy to cause the vibration and noise of the grinding system,seriously affecting the surface quality Therefore,this paper takes the stability of camshaft high speed grinding process system as the research object,and carries out the following aspects of research: first of all,this paper makes a theoretical derivation of the machining mode of the constant line speed grinding of the camshaft CNC High speed X-C two-axis coupling linkage point tracking,and gets the corresponding mathematical model of the cam constant line speed grinding.The kinetic model of camshaft grinding system is established,and the dynamic influencing factors of grinding process such as camshaft grinding force,dynamic grinding depth and equivalent grinding wheel diameter are modeled,analyzed and calculated,and the ultimate critical grinding depth value of grinding process system is deduced based on the established grinding dynamics model.Based on the research results of the dynamic characteristics of the grinder in the early stage of the group,the relevant kinetic parameters and modal parameters of the grinding system are identified,and the stability lobe of the grinding system is plotted by MATLAB.Secondly,based on MATLAB/Simulink,this paper builds a flutter simulation model of grinding process,selects a set of grinding process parameter values to carry on the numerical simulation analysis to the grinding process,gets the vibration displacement time domain diagram of the grinding process,and combined with the experimental results of the previous group on the dynamic grinding force of the camshaft grinding process,The change trend of flutter amplitude of grinding process system is explained by the corresponding explanation.Then,combined with the stability analysis of the preceding text,a number of representative grinding process parameters are selected to simulate the grinding process numerically,and the vibration displacement time domain diagram of each group of grinding process parameters is obtained.It is determined that the grinding system can achieve stable grinding under the process parameters of this group,and compares with the grinding stability area of the stability Vane diagram.Finally,the stiffness and damping characteristics of the grinding system are simulated and analyzed,and it is concluded that increasing the stiffness and damping of the grinding system can improve the ability of the process system to resist flutter deformation.Finally,in this paper,the high speed grinding vibration test experiment of camshaft is designed,and the corresponding vibration test platform is built,and the high speed grinding vibration test experiment of camshaft is carried out according to the Designed experimental scheme,and the vibration signal of the grinding process is collected by the corresponding experimental data acquisition and analysis platform.The vibration spectrum comparison diagram of the process system under the combination of grinding process parameters is obtained,and the influence of different grinding process parameters on the grinding vibration and the stability of the process system can be obtained,which verifies the correctness of the Stability analysis and simulation research results of the grinding system in this paper.