Preparation And Frictional Wear Performance Study Based On Laser Weaving Of Cemented Carbide Tools

Cemented carbide is commonly used in the manufacture of cutting tools because of its excellent overall performance,but in the cutting process,there is severe friction on the surface of the cutting tool,high cutting forces in the cutting area,high temperature conditions lead to intense wear on the surface of the tool,thus reducing the cutting performance of the tool.Nowadays,surface weaving technology is an important tool that can significantly improve the friction performance of tools.The preparation of microwoven arrays with random or regular structures on the tool can both alleviate the violent friction between the tool and the chip and the workpiece and reduce the wear rate,and improve its wetting properties and enhance the lubrication effect.Aiming at the problems of severe tool wear and poor surface quality of carbide cutting tools when cutting difficult-to-machine materials,this paper takes the preparation of laser weave on the surface of carbide cutting tools as the basis of research,mainly using experimental research supplemented by relevant simulation analysis,and investigates the action law of micro-groove weave on the frictional wear performance of carbide cutting tools and reveals the friction reduction mechanism of micro-weave.The main studies are as follows:1.Experimental study of laser machined microgroove weaving on carbide tool surfaces.The effects of laser processing parameters(laser power,scanning speed,pulse frequency,number of scans)on the quality of microgroove forming were first investigated,and the microgroove preparation parameters with better morphological forming were identified.The process parameters of laser power of 14 W,scanning speed of 150 mm/s,pulse frequency of 25 k Hz and number of scans of 4 times were finally chosen to produce the micro-grooves with better shape on the tool surface.2.Dry friction analysis of carbide tool surfaces with micro-grooves.ABAQUS simulation software was used to model the friction process of the microgroove tool and analyze the changes in the magnitude and distribution of contact stresses in the tool after the occurrence of friction.Simulation results show that micro-groove weaving on the tool surface can increase the value of the equivalent force on the tool and improve the stress concentration distribution on the tool surface.The study also concluded that the contact stress magnitude and distribution state of the microgroove tool is better at a groove width of 30 ?m,a groove depth of 20 ?m,and a spacing of 70?100 ?m.3.Experimental study on frictional wear of weaving tools and analysis of the mechanism of friction reduction effect.By developing a frictional wear test program,the change law of the frictional properties of the tool surface is studied and the process of friction reduction effect of the microgrooves is analyzed by changing the dimensional parameters of the microgrooves(groove width,groove depth,spacing)and the test conditions(normal load,reciprocating motion speed).It was shown that the microgroove tool surfaces are all smaller than the nonwoven tool surfaces in terms of friction coefficient.Under the conditions of applied normal load of 70 N and reciprocating motion speed of 150 mm/min,the microweave with 35 ?m width,20 ?m depth and 75 ?m spacing has the best friction reduction effect.At the same time,in the presence of lubrication,the mixed affinity weave can enhance the friction-reducing effect of microgrooves.