Method For Recognizing Wave Dynamics Damage And Stress Wave Control In High Energy Efficiency Milling Cutter

In the process of high speed and interrupted cutting,the cutter tooth of high energy efficiency milling cutter has obvious impact when the cutting edge cuts in and out.The uneven distribution of milling cutter stress field increases significantly,resulting in local damage of cutter tooth,and the propagation characteristics of internal load in milling cutter components need to be disclosed.Under the support of National Natural Science Fund,named as “Wave dynamics damage mechanism of high energy efficiency milling cutter and its multi scale collaborative design method”(51375124),the method for recognizing the damage of milling cutter with trans-scale is proposed.The stress wave calculation model of the cutter tooth component of the milling cutter is set up and its influence factor is analyzed.Stress wave control method for cutter tooth component.Therefor according to the structure of milling cutter and its working state,the transient cutting force model of single cutter tooth is established.The constitutive relationship of milling cutter components under impact load is obtained by Hopkinson pressure bar experiment.The method for recognizing cutter components damage with trans-scale is proposed.A force connection method is adopted to make the trans-scale correlation analysis between continuum medium mechanics and molecular dynamics,thereby revealing the damage characteristics of high energy efficiency milling cutter components.The force state of cutter tooth components under the instantaneous cutting force is revealed with the mechanical relationship model of cutter tooth.The results show that the internal structure of milling cutter is in the unstable state under multiple periodic dynamic loads.The particle model of cutter tooth is established by adopting the finite particle method to reveal the internal structure constraint relationship between particles.The string particle motion equation is established by the theory of one-dimensional string to reveal the string dynamic characteristic of cutter tooth under dynamic mechanical loads.At the same time,the mechanism of the transmission and reflection of the stress wave at the joint surface is given.According to the calculation model for instantaneous stress of string particle,the stress wave simulation method of the cutter tooth component of the milling cutter is presented.Combining the cutter tooth structure,the calculation method of stress wave attenuation is proposed.The stress wave solution and verification method for the one-dimensional string system of milling cutter components are put forward.And then the influence factors of the stress wave of cutter tooth are analyzed by the orthogonal test method.The main and secondary relations of the influence of various factors on the stress wave are revealed.Taking the wave peak maximum value and wavelength on joint surface of cutter body as the control target,and taking the screw head conical angle,feed per tooth,cutting depth and speed as the control variables,the stress wave of cutter tooth control method is proposed.And then the effectiveness of the method is verified.Compared with the existing initial control scheme,this method can effectively control the stress wave in the cutter tooth component of the milling cutter to reduce the local structural damage of the cutter tooth component.