Research On Compound Vibration Absorbing Tool Bar Of Inner Hole Turning Tool In Hard Cutting

Research on vibration characteristics of vibration reduction tool rod of inner hole turning tool under hard cutting is mainly due to the easy occurrence of cutting chatter under hard cutting.Especially when PCBN tool is used for turning inner hole of workpiece with higher hardness,because PCBN tool is brittle,cutting chatter will occur during cutting process,resulting in micro-cutting edge collapse,shortening life,increasing processing cost,reducing processing quality and production.Adverse consequences such as production efficiency.Therefore,reducing cutting chatter is of great significance for improving the quality of workpiece.The composite vibration absorber studied in this paper is mainly to place the rubber damper and the particle damper in the inner hole of the tool rod to reduce the adverse impact of cutting chatter by using the composite vibration absorber.This paper introduces the passive control type of vibration-reducing boring rod,active control type of vibration-reducing boring rod and semi-active control type of boring rod,analyses the causes of vibration of cutting tools in the process of processing,puts forward the methods of vibration-reducing of cutting tools and the development status of vibration-reducing cutters at home and abroad,designs a composite vibration-reducing cutter rod,the vibration-reducing cutter rod will use rubber dampers and particles.The damper is combined in the cutter rod cavity.On the one hand,rubber dampers are used to consume the energy generated by vibration.On the other hand,the collision between particles and the inner wall of particles consumes the kinetic energy generated by vibration to reduce the vibration amplitude.The main research contents are as follows:(1)According to the structural of the compound vibration-absorbing turning tool rod,the mathematical model of the compound vibration-absorbing turning tool rod is established.The relationship between the size of the rubber damper and the particle diameter and the amplitude of the particle damper under the excitation force is analyzed,which provides a basis for the further analysis of the size and particle diameter of the rubber damper.(2)Analyse the relationship between the dimension parameters of rubber damper and the deflection of cutter rod.When the ratio of aperture to height of cutter rod is 0.6,the amplitude is the smallest,and the ratio of axis length of inner hole to length of rodis 0.3,the deformation of cutter rod is the smallest.Calculate the coincidence,normal force and tangential force during particle collision,which are used to determine the plastic deformation and the energy produced by friction force of composite damper under excitation force.Consumption.(3)Ansys simulation experiments of particle damper with different diameters and materials were carried out to study the velocity and energy changes of the same material with different diameters.It was found that the maximum energy consumption of lead particle with diameter of 1 mm was obtained.The amplitude-frequency response curves of NBR as rubber damper material and 1mm diameter lead particles as fillers were analyzed and the reasons for the differences of the results were obtained.Under the frequency response of 0-4000 HZ,the amplitude of the compound vibration-absorbing turning tool is 2.6345 micron when the step number is 13 and the radial cutting force is 3324 N.When the radial cutting force is 3324 N,the ratio of the diameter of the damping chamber to the end width of the tool rod(d/h)is 0.6,and the ratio of the length of the damping chamber to the length of the tool rod(L2/L)is 0.3,the vibration amplitude of the compound vibration-reducing turning tool is 2.6345 um.(4)In order to reduce the use of composite shock absorber materials and achieve the optimum shock absorption effect,the shape parameters of collision particles and the size parameters of shock absorber cavity are optimized.After the parameters of particle damper are determined,the optimum parameters of rubber damper in the cutter rod cavity can be determined.Reduce the amplitude of the tool rod again.It provides a basis for the actual processing of compound vibration-absorbing turning tool rod and the improvement of the surface quality of the machined inner hole.