| As complex mechanical equipment,CNC machine tools have strict precision requirements.However,during the actual measuring process,some precision testing instruments(such as laser interferometers)have strict management and application systems,which require professional technical personnel for operation guidance,more time-consuming and complicated testing procedures.This precision testing method of CNC machine tools is costly and inefficient,which needs to be improved urgently.This thesis takes the detection of the positioning accuracy of the Y-axis table by the laser interferometers as an example,combining virtual reality,data prediction and other information technology methods,constructing a virtual detection system for the accuracy of CNC machine tools,which is used to solve the mentioned problem above during the detection instruments application.Based on the virtual model mapping and error theory model construction,the accuracy detection data is used to drive the prediction algorithm to realize the inspection and prediction function of the positioning accuracy of the machine tool table,and the accuracy and robustness of the system are experimentally verified.The development of the virtual inspection system for the accuracy of CNC machine tools has been completed.The main research contents of this thesis are as follows:(1)The overall design of the virtual inspection system for the accuracy of CNC machine tools has been completed.Based on technologies such as virtual reality,accuracy detection,algorithm prediction,and etc.This thesis put forwards the overall framework and operating mechanism of the virtual detection system for the accuracy of CNC machine tools.In the operation and maintenance stage of CNC machine tools,it takes the positioning accuracy detection of the CNC machine tool table by the laser interferometer as an example,referring to the positioning accuracy detection methods and requirements of physical CNC machine tools,some software is chosen to compose the software development platform of the system,such as SolidWorks2019,VS2008,Vega Prime5.0,MATLAB and other software.Furthermore,by the method of virtual scene construction,the design and development of the virtual inspection system for the accuracy of CNC machine tools has been realized.(2)The model of the virtual inspection system for the accuracy of CNC machine tools has been constructed.In Cyberspace,its virtual mapping model has been built by referring to the physical testing equipment Renishaw XL80 laser interferometer and high-speed CNC machine tool DVG850.At the same time,based on the analysis and study of the characteristics of the laser path change of the laser interferometer,by the means of scene simulation,C++programming virtual modeling and others,the virtual automatic disassembly and optical path calibration functions of the CNC machine tool accuracy virtual inspection system have been developed,the co-simulation technology which combines OpenGL with Vega Prime has been proposed,the design and construction of the laser beam simulation function has been completed.(3)The detection function of the virtual detection system for the accuracy of CNC machine tools has been developed.In this thesis,the comprehensive influencing factors of the precision detection of CNC machine tools have been analyzed,and a mathematical model of the positioning accuracy of the CNC machine tool table has been constructed.Using the DVG850 positioning accuracy detection data as the algorithm drive,the prediction accuracy of SVM and BP neural network algorithm have been compared,and the optimized BP has been selected as the technical support of the system detection function.By the means of MATLAB and C++mixed programming,the research and development of the inspection and prediction functions of the CNC machine tool accuracy virtual detection system have been realized.(4)The experimental verification of the virtual detection system for the accuracy of CNC machine tools has been carried out.Detecting the Y-axis positioning accuracy of the CNC machine tool SK-GD650 worktable by the laser interferometer,using the average value of the detection data as the reference expected output data,the prediction digital model of the system has been compared and verified.As a result,the curve trend of the actual detection data and the system prediction data is consistent,and the coefficient of determination can reach more than 0.980.It can be seen that the virtual detection system for the accuracy of CNC machine tools developed in this thesis meets the requirements of the virtual detection function of the accuracy of CNC machine tools,and has good generalizability and robustness.The development of the virtual inspection system for the accuracy of CNC machine tools has realized the simulation of the accuracy inspection process by computer means,moreover,provides a set of the visual teaching software system,which provides a practical method for the development of the virtual inspection system. |
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