The Nonlinear Vibration Characteristics Research In Milling Chatter Produce Process

With the rapid development of modern industry and the fierce demand ofmarket, the products are constantly developing to the high precision and highefficiency. Among these products, Titanium Alloy stuff is in dominant position.However, as the features of complex shapes, poor rigidity and heavy cuttingforce of the typical Titanium Alloy workpiece, the complexity of the structuralsystem of the machine as well, all may cause vibration especially the chattergenerated in the process of milling which affects the quality of the machinedsurface, tool life and the machine life seriously. Therefore, this article advancedthe following research for vibration nonlinear chracteristics in milling chatterprocess combined with theoretical analysis and experiments study:Firstly, in order to solve the chatter problem in the Titanium Alloy millingprocess, taken the variable depth experiments, and analyzed frequency constituteof the vibration signal and vibrate form of chatter through the three dimensiontable shake, at the same time employ the whole polymerization distinguishmethod to identify the experiment modal parameters of the milling system.meanwhile considering different milling conditions for stable domain research, toensure the stability of Titanium Alloy milling process.Secondly, by the method of nolinear dynamics stability analysis to judge thedynamic characteristics of vibrate signal from chatter process qualitatively. Theresearch shows that nonlinear chaotic vibration behavious exist in millingprocess. Furthermore，chracteristics of vibration signal in chatter process wereextracted by the continuous wavelet and higher order spectral. Waveletcoefficients changed obviously at1800Hz for high frequency and at40Hz for lowfrequency. The diffusion behavior is obvious at0.5kHz or more in dual spectrum,which provide basis for following analysis. Then, build the nonlinear chatter model between nolinear stiffness andcutter prejudicial, use the method of numerical analysis to describe the influenceof vibration state quantitatively with the cutter prejudicial and speed parameter.Analyzed the relationship between chaos vibrate and surface quality. A newmethod of3D relation diagram for Lyapunov, speed and depth of cut wasproposed by juxtaposing simulation and experiment.At last, based on the theory research findings, processing research ofintegrated system and utility software, on the base of given process dynamicssimulation analysis theory to develop milling system dynamics test simulationsoftware, realizing the function of signal analysis and dynamics simulation,developed function module expand the functionality of current dynamicssoftware and verify the practicability of developed software. It has good guidingeffect for scientific research and actual production.