Research On Dynamical Analysis Method And Control Technology Of Machine Tool Error

On the basis of comprehensive analysis for recent research status of ‘machine tool error control’and ‘machine error modeling’,the modeling method of machine tool error model are studied and the general error model of machine tool are built for dynamic analysis of machine tool error which includes the analysis of the error dynamic sensitivity and the error error function law; then the error control method for machining accuracy is put forward and software for analysis and control of machine tool error is developed.In chapter one, introduces the background of this issue and research status on the‘machine tool error control’and ‘machine error modeling’ from domestic and foreign scholars; Based on the systemic analysis of the shortcoming in present stage,the significance and main content of this research is clarified.In chapter two, the basic theory and method of digitizing error modeling on machine tool introduced, what consists of ‘Multi-body System Theory’ and ‘homogeneous coordinate transformation’; the methods of general error model of machine tool is summarized, then taking a numerical lathe as object, the accuracy model of it is established. then the steps and methods of error sensitivity analysis under motion conditions is put forward, when consider the motion of x-axis and z-axis,sensitivity analysis of 54 unit errors between nine members of machine is accomplished. The result showed values of a portion of these unit errors has changed,which were reflected in magnitude and direction.In chapter three, on the basis of the machine kinematics error model, the general steps of analysis error function of machine tool error under movement conditions are given, which contains analysis for a single unit error and a plurality of unit errors.The former analysis provide us error law affected by single unit error in x.y.z varing the motion interval, the latter analysis suggests that the phenomenon of error mutual superposition or offset when machine tool error source transferation.In chapter four, with the purpose of controlling surface quality, the strategies of machine errors is developed. Taking the typical surface which contains cylindrical surface and plane as object, Respectively the workpiece surface is simulated and their data visualization is achieved. Soon afterwards the evaluation of cylindricity and flatness is achieved by computer programmer on the digital surface. The constraints betweenbasic tolerance project and errors of six degree of freedom is defined which restrict the error model, under these component tolerance constrains the method for controlling workpiece machine precision is studied, the output errors in three direct of X/Y/Z is limited reached a reasonable range by analyzing the statistical law when entering error obey uniform distribution. Base on the sensitivity analysis and tolerance function analysis of component tolerance for error variation and radical continuous run-out error of workpiece,the tolerance of adjacent parts is determined.In chapter five, with the help of the MATLAB GUI platform, the ‘machine tool error modeling module’, ’error sensitivity analysis module’ and ‘workpiece digital forming module’ are completed.In chapter six, all of the work in this dissertation is summed up, and the future research of ‘machine tool error control’and ‘machine error modeling’.