Study On The Disassembly Performance And Load Carrying Capacity Of Textured Interference Fit

Disassembly is the prerequisite of remanufacturing.Interference fit is widely used in mechanization equipment.Remanufactured dismantling often damages the interface which leads the parts can't be remanufactured.To explore and research the disassembly performance and load bearing capacity of the interference fit interface with crater texture,the methods of disassembly simulation test and surface maximum static friction coefficient test and computer simulation are used in this thesis,taking the impeller and shaft of large centrifugal compressor as the research object.The model of interference fit is established and the dismantling simulation experiment is designed in this paper.The forming mechanism of disassembly damage is analyzed according to the surface damage of dismantling simulation experiment,and the damage volume is conducted as the evaluation parameters of disassembly damage.Different diameter and area densities of crater textures are processed on simulated interference fit surface of the specimen by means of laser.The simulated disassembly experiment was carried out under different loads,in which optimal texture parameters that make the disassembly interface damage least can be obtained.By comparing the disassembly performance between texture interface with optimal parameters and non-texture interface,it is found that the interfacial textures can significantly reduce the disassembly damage of interference fit.Through the analysis of the surface hardness value,the surface force simulation and the damage microscope,the mechanism of texture damage reduction is analyzed.Finally,the test of maximum static friction coefficient proved that the textured surface can greatly improve the bearing capacity of interface.After repeated dismantling,textured interface still is not less carrying capacity than the non texture surface at the same time.From the perspective of remanufacturing,it is feasible to apply the surface texture to the interference fit interface to reduce the disassembly damage.