Research On Spindle Error Measurement Method And Application Of The Spindle Based On The Frequency Domain Three-point Method

Precision measurement technology is a key ring of precision and ultra-precision processing technology, and also the hot and difficult field of precision and ultra-precision machining technology. Especially the measurement and evaluation of the form error and rotational error based on the error separation technique has been always the focus of the study at home and abroad. Spindle error measurement inevitably mixed with the form of the device, eccentric error and random error. For high-precision measurement of spindle error, the mixed artifact form can't be ignored, while the eccentric error needs to remove and the impact of random error should be reduced. So the spindle of precision measurement technology is focused on error separation techniques.The subject used three-point method in frequency domain which can completely separate artifact form, and further derive the approximate three-point method. In view of the complexity of frequency domain separation principle, through the joint of Matlab and VC++, we prepared the spindle error measurement software system in order to improve the algorithm running speed and optimizing the user interface. In order to ensure the technical feasibility and separation accuracy of the three-point method in frequency domain, we have a more in-depth study. Firstly, according to the geometric characteristics of the various components of the error signal, established a simulation error-data model. Secondly, have a simulation analysis to three-point method in frequency domain by using simulation error data, the results verify the feasibility of three-point method. Thirdly, we discussed the error sources and error suppression method of the three-point method in frequency domain. And further use Matlab to simulate the three-point method in frequency domain. Based on the simulation result, compared the separation accuracy between three-point in frequency domain method and approximate three-point method, then analyzed the impact of positioning angle error of sensor, the standard ball order and random noise to separate accuracy. At last for further precision measurement requirements of spindle rotation accuracy of ball nut machine tool, based on the results of the simulation analysis, by selecting the optimal angle and position sensor mounting tolerances, this paper designed a set of ball component of the spindle, and developed a new measurement program.In experimental studies, based on the principle of approximate three-point method in frequency domain, we used the spindle error measurement system to have an actual measurement for the aerostatic bearing spindle rotational error of the high speed machining laboratory of Guangdong University of Technology. And build a spindle error measurement hardware and software system. Through the analysis and evaluation of measurement data demonstrate that approximate three-point method error separation technique is effectiveness and the measurement system is reliability. It laid foundations for further using the measurement system of three-point method in frequency domain.