Surface Texture And Antifriction Properties Of Femtosecond Laser Machining Cemented Carbide Tools

Due to the lack of cooling and lubricating effect of cutting fluid in the dry cutting process,the tool surface wear is aggravated and the overall cutting performance of the tool is reduced.In recent years,it is found that natural biological surface texture morphology is widely used in the manufacturing industry,and surface texture technology as a new surface treatment method can effectively improve the friction reduction performance of the tool.In this paper,based on the surface machining of cemented carbide tool,micro-texture is being prepared on the surface of the tool by femtosecond laser technology,and the cutting process of the tool is being simulated by relevant simulation software.The anti-friction principle of texture and the friction and wear performance of the micro-texture tool are being studied.The main studies are as follows:In this paper,combined with the stability of inverted quadrangular pyramid structure and the advantage of easy control of aspect ratio,we apply the inverted quadrangular pyramid structure to the tool surface,establish the basic mathematical model,define the basic parameter range based on the geometric characteristics of the structure,summarize three distribution modes according to bionics,and determine the preparation area of micro-texture.We explain the friction-reducing mechanism of micro-texture on the tool surface from cutting force and cutting temperature.We simulate the cutting process of micro-textured tools with different distribution characteristics using ABAQUS software.The simulation results show that the inverted quadrangular pyramid texture can effectively reduce the stress concentration phenomenon,reduce the cutting temperature of the tool surface,improve the cutting performance of the tool,and reduce the tool wear.By comparing the effect of micro-texture with different distribution characteristics on the tool performance,we find that the overall effect of the linear distribution texture is the best.The micro-texture machining experiments on the tool surface are being carried out by femtosecond laser equipment,and the laser parameters are being determined by single factor and orthogonal method.Finally,we select the laser power of 5W,repetition rate of 50 KHz,scanning speed of 4mm/s,and scanning times of 1 time to process the structure with small thermal influence range,which lays the foundation for the preparation of inverted quadrangular pyramid micro-texture.The friction and wear tests of micro-textured tools are being carried out on a reciprocating friction and wear tester,and the wear characteristics of micro-textured tools with different distribution modes are being analyzed.The test results show that the friction coefficient and wear rate are completely different with different distribution modes of surface texture.At the same time,the abrasive particles will cover the micro-texture morphology of the tool surface in different degrees in the later stage of the test,resulting in the increase of friction coefficient.By comparing the wear morphology and wear rate of the tool surface,we find that the micro-textured tool with linear distribution has the best friction-reducing effect.The results of this paper show that the micro-texture can reduce the wear of the tool to a certain extent,which has a certain significance to improve the service life of the tool.