Basic Research On Dynamic Characteristics Of Damping And Dynamic Anti-vibration Cutter Based On Chatter Suppression Mechanism

With the continuous development of aerospace,vehicle,ship and mould manufacturing fields,People are beginning to have more higher requirements on the processing accuracy,processing efficiency and surface quality of parts.As an advanced processing technology,high-speed milling is widely used in the above-mentioned fields.However,when machining deep_cavity and thin-walled parts,chattering during milling has become a major factor affecting machining accuracy.In this paper,a double-damping mass anti-vibration milling cutter with large length-to-diameter ratio and large overhang is designed based on the working principle of multi-freedom dynamic damper,The anti-vibration performance of the three different anti-vibration milling cutters was evaluated by theoretical model,simulation and experimental verification for the same size of solid milling cutters and single-damping mass anti-vibration milling cutters.The main researching contents of this article are as follows:(1)The theoretical model of the two-degree-of-freedom dynamic damper is optimized to determine the optimal anti-vibration parameters through Matlab,and based on this,the internal structure of the anti-vibration milling cutter is preliminarily determined.The modal simulation analysis and harmonious response analysis of solid milling cutter,single-damping mass milling cutter and double-damping mass milling cutter are carried out respectively,and the changes of the first six modes and the response amplitude of the three anti-vibration milling cutters are studied.Based on the single-factor experimental method,the influence of changing the internal structure parameters of the double-damping mass anti-vibration milling cutter was studied.(2)Through modal experiments,the modal parameters and amplitude-frequency response curves of three anti-vibration milling cutter with different damping fluid kinematic viscosity coefficients are obtained.Then compared with the theoretical modal simulation data,it was found that the response amplitude of the double-damping mass anti-vibration milling cutter is the smallest when the kinematic viscosity of the damping fluid is 10,000 cst,and compared with the solid milling cutter and the single-damping mass milling cutter,it fell 64.5% and 44.8%respectively.Therefore,the anti-vibration milling cutter and the solid milling cutter with damping fluid kinematic viscosity coefficient of 10,000 cst are used to draw the flutter stabilitylobe diagram.By comparing the graphics,it is found that the chatter stability region of the double-damping mass anti-vibration milling cutter is significantly larger than the other two milling cutters,and the minimum limit cutting depth is significantly improved.(3)The milling comparison test of the anti-vibration milling cutter with the damping fluid is 10,000 cst and the solid milling cutter was carried out,and then studying the milling force,vibration signal and surface topography of the workpiece respectively,The results show that the double-damping mass anti-vibration milling cutter has a lower milling force than the other two anti-vibration milling cutters,and the peak value of acceleration and the response amplitude at the flutter frequency during vibration are relatively minimum.In addition,the vibration pattern of the workpiece surface processed by the milling of the double-damping mass anti-vibration milling cutter is generally orderly,which is significantly improved compared with the other two milling cutters.This paper shows that the double-damping mass anti-vibration milling cutter designed in this paper has a more significant chatter suppression effect than the solid milling cutter and single-damping mass anti-vibration milling cutter.