Preparation And Cutting Performance Of Micro-textured Coating Tools

During the cutting process of difficult-to-machine metal materials,a large amount of cutting heat is generated at the cutting edge and nearby surfaces of the cutting tool,which is prone to severe wear and chipping.The traditional turning tool has a low service life and low cutting tool life.The processing performance has very high requirements.The textured surface is different from the smooth surface of traditional turning tools.It is prepared with a certain micro-texture morphology near the cutting edge.This texture morphology may weaken the adhesion of chips and have better surface wear and damage resistance.performance.At the same time,the coating tool technology at this stage has a relatively mature preparation process,and the coating can significantly increase the service life of the tool.The micro-texture technology of the tool surface and the coating technology are combined to take advantage of the synergistic effect of the two.Can more and more enhance the cutting performance of cutting tools.However,the current forming and production efficiency of textured tools is very low,and it is still only in the experimental stage,and the mechanism of the impact of surface texture and coating on cutting tools has not yet formed a complete theoretical system.In order to further improve the machining performance of the tool,and realize the efficient production of micro-textured topography tools,and to explore the mechanism of the combination of texture and coating,this paper combines the finite element simulation analysis and cutting test to the surface texture coated tool Cutting performance has been researched from morphology design to preparation and cutting performance.The main research contents are as follows:First,the ABAQUS software was used to carry out the thermo-mechanical coupling simulation of orthogonal turning TC4 titanium alloy for two types of smoothtexture turning tools and non-smooth micro-texture turning tools.The cutting force and temperature of three types of micro-textured turning tools,NT,TV and TP,are compared and analyzed.The results show that the textured turning tool can reduce the turning force and temperature during the turning process,and change the temperature during cutting.Conductive trends on the blade.Then use wire cutting and micro-EDM technology to design and prepare four different texture morphology molds on the surface of cemented carbide materials.Combining with the compression molding process,the surface has TP-100,TP-200,TV-100,TV-200 and non-textured cutter NT.Then use magnetic filtering vacuum cathode arc ion coating equipment to deposit a layer of Ti Al N coating with a thickness of about 1.5?m on the surface of each tool.The surface texture morphology and coating of the prepared turning tool were characterized.Through characterization,it was found that the surface texture turning tool obtained by compression molding had a complete texture profile and a uniform thickness and quality coating.better.Under the condition of dry friction,select the GCr15 steel ball on the CFT-I type surface performance comprehensive test bench to perform the friction and wear test of the reciprocating motion with the prepared coated and uncoated textured surface.By analyzing the friction of different surfaces The dynamic change curve of friction coefficient during wear and the wear scar on the surface of the workpiece to explore the friction and wear performance of different shapes of the substrate surface.The results show that,when there is no texture on the surface of the workpiece,the friction coefficient after coating the surface is smaller than that of the uncoated surface,and the time to reach the stable friction coefficient is shorter;compared with the NT surface,other Both textured surfaces can shorten the time to reach a stable wear state,and the friction coefficient is smaller.Compared with the uncoated surface and the coated surface with the same surface morphology,the average friction coefficient of the CTP type surface is the smallest,and the anti-wear effect is the best.Under dry cutting conditions,the orthogonal cutting test of the prepared coated and uncoated tools and the TC4 titanium alloy tube was carried out using the EK40 horizontal CNC lathe.By comparing the turning force measured in the experimental machining and the surface wear morphology near the cutting edge,it is shown that: under the same turning conditions,different from the coated turning tool CT,CTV100,CTV200,CTP100,CTP200 micro-textured coated turning tool is the main The cutting force has been reduced to varying degrees;when the cutting speed is 600r/min and 800r/min,the main cutting force of the CTP200 tool is reduced by 15.6% and 12.2%,and the feed resistance is reduced by 25% and 25.6%,respectively.Under the same turning speed parameters,both TP and TV grooves can reduce the bonding wear of the turning tool surface;and in the same groove arrangement type tools,the coating turning tool has better resistance to bonding and wear reduction.The turning tool with a groove width of 200?m has the best wear resistance.