Parameter Identification And Vibration Analysis Of Ultra-precision Single-point Diamond Fly-cutting Machine Tool

As an important equipment for ultra-precision processing,ultra-precision machine tools are the most intuitive embodiment of a country's ultra-precision processing technology level.Therefore,our country attaches great importance and supports to the development of ultraprecision machine tools with our own property rights.In view of the complex structure and the high requirement of processing precision of the ultra-precision machine tool systems,it is necessary to perform the vibration analysis of the whole system in its research and design stage,so as to provide an important theoretical basis for the dynamic design and optimization of the machine tool.In this paper,the ultra-precision single-point diamond flying-cutting machine tool was taken as the research object,and the main work has been done as follows:(1)The dynamic model of multi-rigid-flexible-body system and its topological diagram of the ultra-precision single-point diamond flying-cutting machine tool system were established.The modal test of ultra-precision single-point diamond flying-cutting machine tool system was carried out,and the modal parameters under different working conditions such as natural frequency,damping ratio and mode shape of ultra-precision machine tools were obtained,which provided a basis for the dynamic design and optimization of the machine tool dynamic model.(2)Combining the transfer matrix method for multi-body systems and multi-island genetic algorithm,a physical parameter identification method for ultra-precision machine tool system was proposed.And the physical parameters of the ultra-precision single-point diamond multirigid-flexible body system were successfully identified according to this method.(3)Based on the transfer matrix method for multi-body systems,the total transfer equation and the total transfer matrix of the machine tool system were automatically deduced.The parameter identification results were used to calculate the natural vibration characteristics of the ultra-precision single-point diamond machine tool system.Meanwhile,the displacement and acceleration response of the cutter were solved.The calculated results were in good agreement with the experimental results.