Study On The Performance And Device Of Micro-Nano MRE For Deep Hole Processing Damping Systems

Deep hole processing technology is an significant part in the field of machining.Deep hole processing is understood as the hole processing technology where the ratio of the depth of the processed hole to its diameter exceeds 5.This puts forward great requirements for the rigidity of its tool,but its machining characteristics determine its thin and long structure and low rigidity.At the same time,it also faces problems such as the inability to observe the working condition of the tool in real time and the difficulty of cutting the outer row during its machining process.Its complex working condition makes it easy to produce self-excited vibration or regenerative vibration,which will lead to the decline of the quality and accuracy of the hole,and also cause the wear and deformation of the tool,reducing its service life.It seriously affects the performance of the processing machine tools and reduces the efficiency of production,which causes a lot of economic losses.Therefore,it is important to study how to effectively suppress the cutting vibration generated during deep hole machining for improving the quality of workpiece and production efficiency.This paper focuses on the research of a new type of micro-nano magnetorheological elastomer(MRE)with higher magnetorheological effect.Its mechanism is to fill the gap between micron magnetic conductive particles by adding nano ferromagnetic particles,so that it can obtain a magnetic chain structure with better performance,so as to achieve the effect of improving the magnetorheological effect.Based on this,a damping device for deep hole processing is designed.This paper mainly studies a new type of micronano magnetorheological elastomer,which improves the magnetic chain structure by adding nanometer ferromagnetic particles to improve the magnetomechanical properties,and designs a magnetorheological elastomer damper for the self-excited vibration control of deep hole machining.In this paper,a micro-nano magnetorheological elastomer vibration absorber for deep hole processing is proposed.The shock absorber is based on a new type of micro-nano magnetorheological elastomer,the mechanism of which is to improve the magnetic chain structure in the magnetorheological elastomer by adding nano-ferromagnetic particles to achieve the effect of enhancing the magnetorheological effect.In this paper,the mechanism of self-excited vibration during deep hole machining is first analyzed,and the parameter characteristics when the system is unstable are determined.Secondly,according to the experimental data of micro-nano magnetorheological elastomer,the equivalent damping and equivalent stiffness of the shock absorber were calculated,and they were substituted into the dynamic model of the deep hole processing vibration damping system,and the system was simulated by Matlab/Simulink to verify the feasibility of the micro-nano magnetorheological elastomer shock absorber.Subsequently,micro-nano magnetorheological elastomers(0%,4%,8%,12%)with different nanoparticle contents were configured,and a mechanical property test system was built,and normal force and shear mechanical properties were tested.The experiments show that the magnetorheological modulus of micro-nano magnetorheological elastomer containing 4% nanoparticles is the most excellent,its magnetoelastic modulus is 2.56 Mpa at 1A excitation current,while the magnetic elastic modulus of micron magnetorheological elastomer is 2.15 Mpa.Finally,based on micro-nano magnetorheological elastomer,a cylindrical shock absorber for deep hole processing is designed,and the structural parameters and coil turns of the shock absorber are determined by the calculation of its magnetic circuit.In order to verify the rationality of the structure of the shock absorber,the finite element simulation is carried out,and the simulation results show that the magnetic field strength at the micro-nano magnetorheological elastomer in the shock absorber can well meet the magnetic properties of the elastomer,among which the magnetic field strength at the position of the shear magnetorheological elastomer is B=0.468I+0.005,and the magnetic field strength at the extruded magnetorheological elastomer is: B=0.355I-0.0217.