Research On Friction And Wear Characteristics Of Microstructure Surface Of Unfolding Wheel Based On Finite Element Method

The unfolding wheel is a key component of the bearing steel ball surface quality detection mechanism.Increasing the friction coefficient can reduce slippage and improve the unfolding efficiency of the steel ball.At the same time,it is necessary to reduce the wear of the unfolding wheel surface to increase the life of the unfolding wheel.To this end,this article applies the microstructured surface technology to the unrolling wheel,and combines the experiment and the finite element method to study the friction and wear characteristics of the unfolding wheel microstructure surface.First,the wear morphology of the worn deployment wheel is analyzed to determine the type of wear of the deployment wheel.Combined with the microstructure surface morphology and material characteristics,the microstructure friction reduction mechanism was analyzed.Perform stress analysis,establish a mathematical model of the stress and strain on the surface of the friction pair,analyze the influence of the surface stress distribution on the friction coefficient and wear rate through the stress-strain model and failure principle,and use the Archard wear theory to establish the microstructure surface wear mathematics based on the finite element method model.Then,according to the contact form of the steel ball and the unfolding wheel,a sliding friction and wear model of the steel ball-microstructure specimen was established,and a friction and wear test bench was designed and built.The dry friction and wear test was carried out with the load and the area of the single pit of the microstructure as variables.The coefficient of friction and the amount of wear of different test pieces under various loads.The test data is used to analyze the variation of friction coefficient and wear,and the effects of load and single-pit area of microstructure on the friction and wear performance of the unfolding wheel are studied.By fitting the test data,the parameters needed to establish the finite element simulation model,namely the pressure influencing factor and relative sliding influencing factor,are obtained.Finally,Based on the sliding friction and wear model of steel ball-unfolding wheel,the wear finite element model of microstructure surface and smooth surface is established.The static stress of the stress distribution on the microstructured surface and the smooth surface is analyzed.Numerically simulate the wear process of the two surfaces under the same load,and analyze the change of the maximum wear depth and the amount of wear.The influence law of the microstructure on the friction and wear performance of the unfolding wheel surface is obtained.Through comparison and analysis with experimental data,the accuracy of the numerical simulation of wear is verified.In this paper,the mechanism of friction and wear reduction of surface microstructures is analyzed through stress and strain theory,combined with experimental and finite element simulation methods to study the characteristics of friction and wear reduction of the microstructure of the unfolding wheel,and the effect of microstructure parameters on friction coefficient and wear.