Experimental Research On Orthogonal Cutting Performance Of WC-Co Tool By Laser Texturing

Nowadays, modern cutting tool technologies such as exploring the development of new tool material, optimizing the cutting tool geometry, innovating the cutting tool coating and modifying the machining process have improved vastly the tool cutting performance in the application of metal cutting engineering. However, the technologies improving the cutting tools have hardly come across a major breakthrough limited by the development of current science and technology in a short term. In recent years, tool surface texture technology has been arised at the historic moment with the deepening of the green manufacturing concept, namely, fabricating reasonably a certain amount of micro-textures which can improve surface lubrication state of friction on the tool surface for cutting process.The preliminary studies have suggested that the surface textured tools can improve effectively the tool cutting performance. Based on the demonstration, we attempt to produce a variety of convex textures with characteristics of a roughen body by laser technology on the rake face of cutting tools artificially to improve the friction characteristics of cutting the plastic metal material. In order to develop the new type of surface textured cutting tools, the main research work of this paper are as follows:Firstly, we expound the change of surface stress and friction with the chip flow direction to the rake face in the orthogonal freestyle cutting for plastic metal materials in detailed. Moreover, the influence of the friction between chip and tool on cutting forces were analyzed. According to this friction characteristics, we put forward a concept and design model of a new type of surface textured tool named laser texturing tools.Secondly, we did the experimental study of laser surface texturing for the YG6 x cemented carbide(WC-Co) cutting tool materials. Concretely analyzing and discussing the influence of laser power, pulse width, types of auxiliary gas(N2, O2, air) on the convex texture morphology and size(height and diameter)as well as discussing the forming mechanism of the convex morphology. At last, we came up with the reasonable parameters combination for laser roughen process, which could provide direction for subsequent studies on the surface weave stereotype by laser surface texturing on the rake face of tools.Thirdly, we further studied the performance about texture’s size, area share and high or low cutting condition through orthogonal freestyle cutting experiment by laser surface texturing. It could be concluded that the small scaled convex textures were more suitable for high speed cutting processing and the average friction coefficient were reduced nearly 39% by the convex textures at the wet condition. It also be found that the convex textures could generate built-up edge easily at the rake face.Finally, the three types of inserts(no textured insert named YD-0, convex textured insert named MH-2 and concave cavity textured insert named AQ-6 respectively) were used for turning experiment, which made a comparison about their cutting performances by comprehensively analyzing various indicators, such as cutting force, average coefficient of friction, tool adhesive, chip morphology and the surface quality of the machined part. Eventually, it were found the two types textures at the rake face(concave texture and convex one) had different cutting performance, what’s more, the convex texture with convex characteristic had been demonstrated a better performance on anti-friction and abrasion resistance.