Surface Micromodeling Friction And Wear Research Of The Friction Surface Of Disc Brake

The braking process of disk brake is accompanied with an extremely strong temperature,stress and wear coupling phenomenon.The problems of brake disk with high temperature and stress,the pad with a large number of wear volume,which have become an important reason for reducing the service life of disc brake.Therefore,in order to improve the braking safety,it is important to carry out the surface textured preparation of disk to explorw the influence of different surface textured densities on friction coefficient,temperature,stress and wear of the friction pair.In this thesis,by combinating of the experimental research and the finite element analysis to discuss the relationship between Spheroidal graphite cast iron QT600 disk and resin based composite material pad,and the main research contents are as follows:(1)Through the friction and wear experiment under the situation of dry friction on the textured surface,the influence of the geometry and distribution of the laser microshape about the friction coefficient and wear rate of the pairs were obtained.According to the comparisoin of six QT600 samples with different densities,the tribological properties of the textured surface and the friction mechanism of under the dry friction condition were investigated.At last,according to the ensemble experiment,the friction coefficient and wear rate of pairs were measured at different temperature,and the tribological properties of the disk brake and the friction mechanism under dry friction situation at different temperatures was revealed.(2)Through the finite software ABAQUS to simulate the thermal stress coupling,the six QT600 samples with different surface textured densities had been established.By comparing the distribution of temperature field and stress field of non-textured and textured models,the influence of temperature and stress of the surface textured densities were discussed.In order to explore the instantaneous situation of the temperature field and stress field of the disk,a strong coupling relationship between the temperature field and stress field was proved by establishing six groups of QT600 whole disk models with different surface textured densities.(3)After the experiment of wear properties,the surface wear depth of six different samples was obtained,the wear volume and the microstructural surface of the samples after wear experiment were also analyzed,which explored the wear mechanism of QT600 samples.According to the analysis of wear rate,the surface microstructure of the QT600 ensemble specimen,the hardness of the wear point at different temperatures and the variety of the surface elements before and after the wear of the pairs,which had explored the wear mechanism of the friction pairs.