Analysis Of Friction And Wear Characteristics Of Steel Ball Expansion Wheel Based On ANSYS Method

Bearing is known as "industrial joints",and the steel ball is the most important part of the bearing,the surface quality of the steel ball affects the service life of the bearing directly,so it is very important for the nondestructive testing of the steel ball.In the steel ball detection mechanism,the surface of the steel ball is fully expanded with the expansion wheel,resulting in serious wear and frequent replacement,and the expansion wheel is expensive,so the life of the expansion wheel directly affects the detection cost of the steel ball.To solve this problem,friction and wear properties of different metal materials were studied based on the surface microstructure,and the material and surface morphology were selected to improve the friction and wear properties of the expanded wheel.Firstly,the expansion principle of the steel ball is analyzed,and the contact mode between the steel ball and the expansion wheel is determined,and the model is simplified according to the actual working conditions and the experimental conditions.Through the analysis of the force between steel ball and expansion wheel,the friction wear for rolling composite wear and adhesive wear as the main wear type are determined;Then the Archard adhesive wear theory as a basic theory of experimental research is selected.On this basis,the finite element method is used to further verify the friction and wear characteristics of the microstructure surface of the material.On the basis of theoretical analysis,the test plan is determined,and the test equipment and test material are selected.Then,according to the test standard and the simplified model,the machining test specimens are designed.In order to achieve the test standard for friction and wear test,the surface hardness and microstructure of the specimens were measured.According to the test results,the friction coefficient and wear rate of different materials are compared and analyzed.And combining with the actual working condition of the expansion wheel,the material is preferred initially.Under experimental conditions,the mathematical model of wear coefficient is established on the basis of Archard wear model.And the wear coefficient is applied to the finite element method.The reliability of the model is verified by simulation,and it is proved that the finite element method is feasible to simulate the wear characteristics of different materials with microstructure surface.Finally,the wear depth of T10 A and 45 steel with Triangular,square,rhombic,regular hexagon and positive eight edge microstructures is simulated by finite element method.And material and surface microstructure morphology is further optimized for expansion wheel.In this paper,the friction and wear characteristics on the working surface of the expanding wheel are studied by means of experiments and finite element method.It provides theoretical support for the selection of wear resistant material and microstructure morphology.