Research On The Errors Recognition And Compensation Technology For The Numerical Control Machine Tools Based On Laser Testing Technology

Research on the errors recognition and compensation technology for the Numerical Control machine tools based on laser testing technology is the main content of this paper.First, the development actuality of the measurement technology and compensation technology of geometry errors and thermal errors in the machine tools both in and abroad China is analysed.Errors of the numerical control machine tools are particular analysed and recognised.Then,the laser interferometer of Renishaw is used to measure the linear positioning errors.The system of the temperature measurement controlled by the ARM board is used to inspect the temperature of the machine tools,and the inspection points of temperature are optimized. The thermal distortion of the machine tools spindle is real-time measured by the high accuracy CCD laser displacement sensors.After expounding the modeling method of multiple linear regression based on least square algorithm,the thermal distortion model is modelled.At last ,the the linear positioning errors are compensated by the compensation of the thread pitch and thread clearance . The thermal distortion of the spindle is real-time compensated by modifing the G code with the PMAC control system.According to the experiment method,the compensation is validated very effective.This paper all has seven chapters:Chapter one: The research focus and significance are put forward in this chapter. A picture of the developing course and trend of the measurement technology and compensation technology of geometry errors and thermal errors in machine tools both in and abroad China.And the mainly work of the paper is simply presented.Chapter two: This chapter presents errors origin and sort of the machine tools.Errors of a three-axis vertical numerical control milling machine is detailed analysed and recognised. Errors analysis and recognition is the basis theory of the errors measurement.Chapter three: This chapter presents several typical measurement methods of the geometry errors:one-D ball bar,double ball bar,KGM,laser interferometer.And the laser interferometer is used to measure the linear positioning errors of a milling machine.This measurement provides credible data for the geometry errors compensation of mahine tools.Chapter four: Measurement research of thermal errors based on laser displacement sensor.Thermal measurement method in mahine tools.This chapter presents the characteristics of the thermal measurement system.The hardware and software of the temperature measurement system and thermal measurement system is detailed analysed. This measurement provides credible data for the thermal errors compensation of mahine tools.Chapter five: This chapter presents multiple linearity regression based on least square algorithmn. least square algorithm and modeling method.This chapter provides a good mathematics model for the errors compensation of machine tools.Chapter six: This chapter presents the basic concept and principle of the compensation in machine tools.Geometry errors and thermal errors in machine tools are compensated. According to the experiment method,the compensation is validated very effective.Chapter seven: This chapter offers a concluding remark for the research project, and indicates the prospects of the development of the measurement technology and compensation technology of geometry errors and thermal errors in machine tools.