| TC4 titanium alloy has excellent properties and many industries rely on it.However,due to its defects in processing,it is a typically difficult to machine material.In practice,it is easy to produce problems such as low surface quality and serious wear and tear of tools.The experimental study of bionics and tribology shows that the animal and plant surfaces with certain non-smooth morphology can achieve good tribological properties such as friction reduction,adhesion resistance and wear resistance,which provides a possible way and research direction for the friction reduction control of tool chip interface in the titanium alloy cutting process.In this paper,the parameters such as the shape,size and distribution of the surface texture of cemented carbide rake face are studied,and the parameters are optimized to reduce the cutting force,cutting temperature,and improve the machining quality and processing efficiency.The main contents and conclusions of this paper are as follows:(1)The cutting mechanism and phenomenon of micro textured tool are analyzed.The constitutive model,failure criterion and chip separation criterion of TC4 titanium alloy are studied.Based on the advantage finite element simulation software,a two-dimensional finite element model of titanium alloy turning is established,and the accuracy of the model is verified.(2)In this paper,the influence of micro texture parameters of tool on cutting force and cutting temperature in titanium alloy cutting process is analyzed by single factor simulation.The depth,width / spacing and edge distance of micro textures are taken as variables to conduct simulation study under dry cutting and infiltration cooling conditions.In dry cutting,micro texture is not very helpful to reduce the cutting force and the temperature chip in the tool contact area;after adding cooling,as the depth of micro texture increases,the cutting force first decreases and then increases,the maximum cutting temperature of the tool decreases and the heat dissipation ability increases,as the width increases,the cutting force of the tool first decreases and then increases,and the tool is the largest;as the edge distance increases,the cutting force increases,and the tool is the largest The cutting temperature rises.(3)On the basis of the obtained influence rules,the micro texture parameters of tool are refined,and the orthogonal experiments of three factors and four levels of micro texture depth,micro texture width / spacing combination and edge distance are designed.The influence rules of three factors on cutting force and cutting temperature are explored.According to the results of range analysis and variance analysis,multi-objective optimization was carried out,and the optimized texture geometry size is obtained,the depth of micro texture is 55 μm,the width/spacing combination of micro texture was 60/40 μm,and the edge distance is 65 μm.The research results of this paper show that the cemented carbide micro-texture cutter has a great advantage over the traditional cutter in cutting titanium alloy,which can significantly reduce the cutting force and cutting temperature and improve the machining quality.The research content of this paper has theoretical value and practical guidance for the processing and production of difficult-to-process materials. |
