Study On Wear Mechanism And Technology Of Processing Ceramic Tools Micro Textured With Laser

The key issue is the rapid wear of ceramic tool that restricts high-speed machining difficult-to-machine materials such as hardened steel, high capability micro-textured surface has grinding with good performance, this technique applied to the surface of ceramic tool will greatly improve the ceramic cutting tools. Therefore, this paper aims at the influence of laser parameters on the micro-textured surface preparation of ceramic tool and the influence of different parameters of surface micro-textured on the cutting capability of ceramic tool these two core issues to carry out research, details are as follows:(1) Using ANSYS for the simulation study of 355nm UV laser processing ceramic tool process, under different laser energy density and scan speed, Analyzing the influence of 355nm UV laser on ceramic material tool removal,and comparing the results of experimental studies, while providing an appropriate choice of parameters for the experiments.(2) Experimental studies with single-factor, analyzing the effect of different laser parameters on the micro-texture prepared, the results show:in the process of 355nm UV laser machining micro structure on the ceramic tool surface, With the increase of the laser energy density, the width of micro channel increases gradually, eventually tends to 25μm, the depth of micro channel also linearly increases; With the increase of the scanning speed of the laser, the width of micro channel is substantially constant, the depth of the micro channel gradually decreases; With the increase of the number of laser scanning, micro channel width fluctuations, the overall trend showed a gradual decrease, micro channel depth linearly increases; When the frequency is between 10kHz～30kHz, as the frequency increases, the width of micro channel decreases, the depth of the micro channel gradually increases. When the frequency is between 30kHz～40kHz, the width and depth of the micro channel rapidly decreases as frequency is increasing. When the frequency is between 40kHz～50kHz, the width and depth of the micro channel gradually increases as frequency increases.Finally, selecting reasonably laser processing parameters of preparation ceramic tool micro-textured surface.(3) Using the ABAQUS finite element simulation software for the simulation study of ceramic tool cutting hardened steel process to analyze the influence of the micro-texture on the tool cutting temperature and tool stress distribution. According to the simulation results, selects different micro-textured topography parameters cutting experiments and establish a theoretical basis for the study of the mechanism of tool wear.(4) Experimental studies using single-factor analyzes the influence of different laser parameters on the micro-textured prepared, the results show:after different morphologies micro textured ceramic tool cutting hardened steel, horizontal micro-textured ceramic tool rake face wear areas is of minimum wear, the cutting edge from the center is the farthest, wear depth is of minimal wear, and transverse micro-textured ceramic tool flank surface of cutting tool is of minimum amount; With the increase of micro-textured depth, before the tool flank wear area increases, the wear of the cutting edge to center distance is getting closer, wear depth increases gradually, the amount of wear flank surface of cutting tool increases; With micro-texture spacing increases, before the tool flank wear area increases, the distance from the wear center to the cutting edge firstly increases and gradually decreases, wear depth gradually increases, the amount of wear after the tool flank gradually increases; With the increase of the width of the micro-texture, former tool wear area increases, the wear and tear from the center is getting closer to the cutting edge, wear depth increases, gradually increases the amount of wear after the tool flank.(5) Observed by using SEM analyzes the former and flank tool wear condition, studies micro-textured surface wear mechanism of ceramic tool. The results show that: the micro-texture depth is too large, the strength is lowered during cutting tool leading to tool breakage; micro-textured space is too large, the decrease of the number of effective micro-texture during the cutting process reduces will result in an increase on wear of the tool; micro-textured frame width is too large, secondary cutting will cause the tool wear increases during the cutting process; lateral micro-texture can effectively reduce the friction of the tool and chip, reduce tool wear.