Study On Wear Mechanism Of Three Metal Wear Resistant Materials Under Coupling Action Of Vibration And Friction

In daily production and life,abrasive wear can be seen everywhere and brings great economic losses and accidents.For the sake of reducing the occurrence of abrasive wear and how to guard against it,we need to understand its mechanism.Under actual working conditions,there is always vibration and friction in the place where abrasive wear occurs,the research on the relationship between vibration and friction and how to affect the abrasive wear is of great meaning to the application of vibration in practical engineering.In view of this practical problem,after theoretical analysis,this paper carries out discrete element simulation on commonly used metal wear-resistant materials of ball mill,and then carries out wear test on self-designed vibration test-bed,and analyzes the wear amount and wear morphology obtained from simulation and test.The stress of metal wear-resistant material is different under the condition of vibration and Non vibration.The physical model is established and the stress analysis is carried out.It is found that compared with the Non vibration condition,the addition of vibration changes the stress of metal wear-resistant material and the physical characteristics between abrasive grains.Based on the analysis of metal wear-resistant materials commonly used in ball mill,three kinds of metal wear-resistant materials,high vanadium high-speed steel W6Mo5Cr4V3,high chromium cast iron Kmt TBCr12 and high strength steel ZGMn13Cr2,are selected to make cylinder test bar as the research object of this paper.Edem software is used for simulation analysis.The diamond abrasive grains are set as simple harmonic vibration,and the metal wear-resistant materials rotate in the abrasive grains,the simulation results show that the wear amount of all kinds of metal wear-resistant material test rods under different vibration frequencies increases linearly with the increase of time.At the same time,the wear amount of metal wear-resistant material gradually decreases with the increase of vibration frequency,indicating that vibration can reduce wear to a certain extent.There is a certain relationship between the wear degree of metal wearresistant materials and the hardness of materials.The greater the hardness of materials,the stronger the wear resistance.The wear resistance of metal wear-resistant materials has a certain relationship with the rotational speed of materials and the vibration amplitude of abrasive particles.The greater the rotational speed,the more intense the wear,the greater the vibration amplitude and the smaller the wear.The results show that with the passage of time,the wear rate of metal wear-resistant materials first remains unchanged,and then decreases gradually.This is because with the progress of wear,the wear particles gradually become blunt,and the wear ability of the test rod decreases;According to the analysis of the surface morphology of the worn metal wear-resistant materials,it is found that the metal surface is as if it has been cut by the tool,but the scratches are not continuous,but intermittent,which is caused by the micro discontinuity of the wear particles,and the cutting of the test bar is weak,at the same time,there are weak pits on the surface of the test bar,This is caused by the sharp abrasive particles impacting the test rod violently.The mechanism of abrasive wear of metal wear-resistant materials under the coupling effect of vibration and friction is as follows: vibration changes the physical characteristics of loose abrasive particles,the addition of vibration greatly changes the void ratio between abrasive particles,and the void ratio directly affects the size of friction force.In the process of vibration,the void ratio of abrasive particles increases and the friction force decreases,the friction force of the abrasive particles on the test rod is gradually reduced,which leads to the decrease of the normal force and the wear amount.It shows that the vibration wear reduction is reasonable,which provides a theoretical basis for how to reduce wear and anti-wear in practical application.This paper has 59 pictures,18 tables and 99 references...