Study On Lubrication And Cutting Performance Of Textured Cutting Tools For Liquid Assisted Laser Machining Of Titanium Alloys

Titanium alloy materials are widely used in various fields such as marine engineering,aerospace,biomedical,and petrochemical industry due to their high strength and thermal strength,good corrosion resistance,and low temperature performance.However,titanium alloys have special properties such as low deformation coefficient,low thermal conductivity,and high chemical activity during processing,which can easily lead to problems such as rapid tool wear and short tool life.In addition,they also have a certain negative impact on the surface quality and integrity of the workpiece,making them a typical difficult to process material.A large number of scholars have found that there are many problems in using traditional processes to process titanium alloys,and currently there are still many challenges.Therefore,this article combines traditional laser processing technology with liquid assisted laser processing technology,and through dry and liquid assisted methods,produces micron level surface textures on the surface of cemented carbide tools.It analyzes the friction and wear performance of different types of textured tools,as well as the cutting force,cutting temperature,and friction characteristics between tools,tools,and chips when machining titanium alloy.The main research contents of this paper are as follows:（1）Design and Preparation of Textured Cutting Tools.Design and determine different shapes of textures,respectively using nanosecond laser systems and femtosecond laser systems to explore the effects of laser parameters such as laser power,scanning speed,and scanning times on texture size and morphology,and determine the optimal laser parameters.On this basis,the effects of auxiliary liquids with different properties such as deionized water,HNO₃ HF mixed solution（1:1）,and Na OH solution on texture size and morphology were investigated,and the optimal functional auxiliary liquids were compared and determined.Dry and liquid assisted laser machining methods were used to process different shapes of textures and surface textures with the same depth,width,and laser parameters on the surface of cemented carbide cutters.（2）Analysis of friction reduction mechanism of different types of textured cutters.Friction and wear experiments were conducted on linear textured tools,scaly textured tools,corrugated textured tools,and femtosecond laser textured tools with the same depth,width,and parameters under dry and liquid assisted conditions,respectively.The focus was on the friction coefficient and surface wear morphology of different types of textured tools and titanium alloy balls,To explore the effects of texture shapes and processing techniques on the tribological properties of cutting tools.（3）Study on the dual effects of lubricating additives and surface texture on the friction reduction performance of cutting tools.A model of YG6 cemented carbide tool and Ti-6Al-4V titanium alloy ball workpiece was established to simulate friction and wear under lubrication conditions.By analyzing the pressure changes of the lubricating oil film,the effect of texture on hydrodynamic lubrication was explored.At the same time,the characteristics and mechanism of different lubricating additives were analyzed,and triethanolamine borate and copper oxide nanoparticles were selected as lubricating additives for friction and wear experiments.The dual antifriction characteristics and mechanism of lubricating additives and surface texture on the tool were analyzed.（4）Study on the cutting performance of cutting tools with different processing textures.Through a combination of simulation and experimental research,a three-dimensional cutting simulation model of YG6 cemented carbide tool and Ti-6Al-4V titanium alloy workpiece was established.Referring to the texture morphology of dry and liquid assisted laser machining with the same laser parameters,two different textures were designed and placed on the front face of the tool.The cutting of titanium alloy with textured tools obtained by different processes was simulated.In order study the functions of contrasting textures,textured tools with the same depth and width were processed under laser dry and liquid assisted conditions,respectively,and cutting experiments were conducted to further study and analyze the intrinsic mechanism of surface texture in improving tool performance and extending tool life.This article compares the friction and wear performance of different types of textured tools,analyzes the mechanism of action of different lubricating additives,and conducts experimental research on the dual friction reduction performance of lubricating additives and surface textures.Through cutting simulation analysis and experimental research,it explores the impact of laser dry and liquid assisted machining on the cutting performance of textured tools.The project research has important significance in improving the processing efficiency of titanium alloy materials,reducing tool wear,and improving tool service life.