Research On Dynamic Balance Technology Of Single Crystal Diamond Micromilling Cutter

With the continuous improvement of the industrial level,higher requirements have been put forward for micro-structure and high-precision processing methods in the fields of aerospace and optics,etc.Micro-milling and other micro-processing technologies are becoming more and more the key content of subject and engineering research due to their irreplaceable role in these fields.At present,the preparation technology of micro milling cutter will cause dynamic unbalance phenomenon due to wear,which will affect the machining quality.The research on dynamic balance technology of micro milling cutter becomes an important part to improve the quality of micro milling.The research and development of dynamic balance theory and equipment in China has been lagging behind the international advanced level since the late 1950 s.In order to improve the manufacturing level of diamond micromilling cutter in China,the dynamic balance technology of single crystal diamond micromilling cutter was studied by many institutes.Firstly,the whole milling cutter rotor system is simulated,and the effects of unbalance,spindle speed and micro-milling cutter extension on the vibration track of milling cutter head are studied.Secondly,based on the simulation results of the milling cutter runout radius,the influence of the unbalance value and the spindle speed on the surface roughness of the ball-end micro-milling cutter is studied,and the vibration response of the dynamic balancing process is simulated,the Unbalance Response Law on the vibration measurement surface is obtained.Then,due to the deficiency of soft and hard threshold de-noising,a wavelet de-noising method is proposed to improve the threshold,and the vibration signal is de-noised,based on the signal processing scheme of Wavelet de-noising and cross-correlation method with improved threshold,a dynamic balance test system is designed,in which wavelet de-noising and cross-correlation are used as signal processing schemes,taking influence coefficient method as dynamic balancing algorithm,it has the functions of signal sampling,dynamic balancing signal processing and dynamic balancing calculation.Finally,the theoretical model of unbalance mass removal is established according to the grinding process experiment,and the unparallelism of the feed moving tool handle,the deflection deformation caused by the force during grinding,the Chamfer and geometry of the grinding wheel,and the Radian of the grinding surface are analyzed,influence of tool setting threshold on removing quality error.The theoretical model is improved by error analysis.On this basis,the theoretical model is verified by dynamic balance measurement and weight removal experiment,and a micro-milling cutter with dynamic balance accuracy up to G0.3 is obtained.