| Titanium alloy is a kind of hard-to-process material,which is mainly machined by carbide cutting tools.The friction and wear of the tool/chip and tool/work affect greatly the quality of the machined surface in the micro-cutting process of the titanium alloy.Therefore,how to improve the friction contact state between tool and chip interface is very significant to reduce tool wear,prolong tool life and improve accuracy of machined surface in titanium alloy micro cutting.With non-smooth surface micro-texture the cutting tools have some advantages,such as anti-wear,friction reduction and adhesion resistance,making the capacities of wear resistance and bearing improved.By arranging the micro texture rationally on the tool surface,cutting force and cutting heat can be reduced in the traditional cutting process,and the adhesion of built-up will be reduced,so as to alleviate the tool wear and improve tool durability.In order to deeply study the effects of non-smooth texture on the micro-cutting performance of titanium alloy,laser machining technology was used to prepare the micro-pit texture on the surface of the micro-turning tools,and the effects of laser processing parameters on the micro-pit texture were analyzed,the optimization of process parameters is realized.Based on the finite element method,micro-cutting simulation studies were performed on the micro-pit texture cutters with different structural parameters.The state of the tool/chip contact,the cutting force and the derivative cutting effect during the cutting process were analyzed.The simulation results show that the micro-pit texture changes the contact state of the tool/chip,and the micro-pit texture reduces chip cutting and rake action on the rake face and reduces the effect of chip accumulation to the surface quality of the workpiece.With reducing the titanium alloy sticking to cutting tool surface,it helps to improve tool wear resistance.The micro-cutting experiment of micro-textured tool titanium alloy was carried out using an orthogonal micro-cutting experiment system.The performances of cutting tools with/without micro-textures were evaluated in terms of tool wear length,width,workpiece surface quality,titanium alloy adhesion amount,and chip morphology.The evaluations were conducted to investigate the effects of micro-texture parameters on the micro-cutting performance of titanium alloys,which laid the foundation for the further micro-cutting micro-cutting theories and processes. |
