Study On The Influence Of Surface Microtexture On The Cutting Performance Of Ceramic Cutting Tools

Tribology shows that surface microtexture can effectively improve the bearing capacity of surface and surface tribology properties. If this technology is applied to ceramic cutting tool, wear problems can effectively solved when cutting difficult-to-machine materials such as the hardened steel. Therefore, this paper carries out finite element analysis and cutting test using surface micro-textured ceramic cutting tools with different morphology and different cross section size, and researches the influence of surface microtexture on ceramic cutting tool. The major works are as follows:(1) Processing surface micro-textured Al2O3-TiC ceramic cutting tools with different morphology and different cross section size by using pulse optical fiber laser processing equipment, and observing the morphology by using laser confocal microscope. Then analyzing whether the morphology and structure size of surface microtexture is up to standard, makes sure that the structure size of surface microtexture is in the consistency in the process of design and test.(2) Simulating the orthogonal cutting process that using surface micro-textured ceramic cutting tool cutting 45# hardened steel by applying ABAQUS. Surface micro texture includes different depth, width and spacing of transverse surface micro texture. Mainly the aim is the value and distribution of cutting force, cutting temperature and cutting stress in the cutting process. The results show:when the depth, width and spacing of micro groove is different, it is different what are value and distribution of ceramic cutting tool’s cutting force, cutting temperature and cutting stress. There is no "secondary cutting" phenomenon between the rank face and chips when the micro groove is 25u,m width. With the increase of the width, "secondary cutting" phenomenon becomes more obvious. With the increase of depth, width and spacing, cutting force and cutting temperature increases gradually, the cutting stress becomes more concentrated. When the depth of less than 20um, the width of less than 35um, spacing of less than 75um, cutting performances of the ceramic cutting tool improved, and has higher strength.(3) Using piezoelectric dynamometer and infrared temperature measurement method to detect cutting force and cutting temperature in the process of cutting. By means of the experiment method of single factor, it is analyzed that the cutting performance of surface micro-textured ceramic cutting tool with different shapes and different cross section sizes, and the friction coefficient between chips and the rank face. The experimental results showed that:With the increase of micro groove’s depth, width and spacing, cutting force, cutting temperature and the average friction coefficient showed a trend of increase. At a depth of lOum, width of 25um, spacing of 50|j.m, the transverse surface micro-textured ceramic cutting tool shows better cutting performances, cutting force decreases by 26%, cutting temperature decreased about 16%, the average friction coefficient decreases by 16%.(4) Through the high-speed dry cutting experiment, comparing the wear morphology and wear value of the surface micro-textured ceramic cutting tool with different shapes and different cross section sizes, and the Gs value of chips. Researches on the influence of different surface microtexture on the performance of ceramic cutting tools. The experimental results showed that:the shape and cross section size of surface microtexture have an influence on the performance of ceramic cutting tool wear and chip sawtooth. Transverse surface microtexture ceramic cutting tool has a smaller wear value. With the increase of depth, width and spacing, wear value of the flank and rank face increase, also the chip Gs increases greatly. A depth of lOμm, width of 25μm, spacing of 50μm, the totality wear value of ceramic cutting tool is small.(5) By using SEM and EDX, analyzing the wear morphology of the flank and rank face and chip morphology surface. Combining with the characteristics of ceramic material, compare the different influences of surface microtexture. The results showed: Reasonable horizontal surface microtexture has the anti-friction cooling effect, avoid the adhesion phenomenon between contact surfaces, and reduce the number of hard particles between rank and chips or flank and work-piece, avoid the abrasive wear, and the cutting performance ceramic cutting tools improved...