Research On Performance Degradation And Error Compensation Technology Of CNC Machine Tools' Spindle Assembly

The spindle system of CNC machine tool, performed as the key component of the NC, the performance of which affects the machining accuracy directly. Researches on the mechanism of the performance deterioration and also the machining accuracy compensation are conducted, which are practically necessary and important.The research is founded by the Important National Science & Technology Specific Projects(no.2009ZX04014-101-01).In this paper,research on the performance deterioration mechanism of the spindle system is conducted with dynamic characteristics analysis.The reliability evaluation method is proposed based on the characteristic parameter monitoring.The reliability evaluation system is built up based on the state detection.The dynamic compensation is conducted with the analysis of those detected characteristic parameter, which is experimentally validated.Chapters of this paper are as follows:In Chapter l,the research status concerning the mechanical system performance deterioration, the spindle system properties and the dynamic compensation technology are introduced. The main contents of this paper are introduced generally.In chapter 2,the dynamic analysis of the spindle system is conducted using software ANSYS.The modal analysis and harmonic response analysis are conducted using the simulation model, through which, the dynamic characteristics of the spindle system are obtained.In chapter 3, the performance degradation modeling and the reliability evaluation method are analyzed in detail for the present spindle system.In chapter 4, the performance degradation monitoring system is developed, which functions through the analysis of those state parameters detected by the reliability evaluation system. The monitoring system is improved by the joint debugging of software and hardware systems.In chapter 5, the performance deterioration induced errors are compensated. The errors are detected online and compensated through by software. The online detecting system and dynamic compensation system are validated experimentally.In chapter 6, the research work are reviewed and summarized, the preliminary assumptions for future works are proposed.