Optimization Of Micro-texture For Cemented Carbide Ball End Mill Base On Friction Properties

Recently, the research results of bionics and tribology have shown that subjects have better tribological properties due to the regular size of morphology surface. Also, domestic and foreign scholars have found that surfaces with high-performance micro-texture play an important role in reducing friction, improving anti-adhesion and wear resistance, which offers a new research direction and field for studying in machining difficult materials. Note that the study on the application of micro-texture and cutting performance of tools with micro-texture is still in the initial stage and the the existent results mainly focus on turning tool and indexable milling inserts. However, to the best of our knowledge, there has been little work under taken on micro-texture optimization and its application to ball end milling titanium alloy. The contribution of this paper is as follows:First, the friction and wear model of cemented carbide-titanium alloy has been established based on the finite element analysis method. Comparing the stress distribution law of micro-texture and smooth in friction process, it is clearly shown that the micro-texture can absorb stress. Also, the optimal texture improved friction performance has presented by analyzing the stress distrib ution of different forms of micro-texture. Finally, the experiments are given to show the effectiveness of the proposed results.Second, experimental research has been conducted on laser processing on cemented carbide surface by using laser- marking machine. According to the study of the impact of laser processing parameters on micro- geometric parameters and morphology, optimal processing parameters are obtained by combining with the principle of laser processing.Third, specimens of surface micro-texture cemented carbide has prepared based on the study of laser processing and the friction performance with the friction couple of ball-surface has been studied by using UMT-2 friction and wear testing machine. Comparative analysis has been presented for friction properties of the smooth surface, micro-pit texture surface, groove texture surface, cross groove textured surface under dry friction and solid lubricant. Also, the antifriction mechanism of micro-pit texture has been obtained by analyzing the impact of different parameters of micro-pit texture on the friction coefficient and wearing morphology of cemented carbide micro-texture surface.Based on the data of experiment, the optimization model of cemented carbide micro-texture surface friction coefficient has been developed by applying the orthogonal regression method. Also, significance test of regression coefficient has been carried out and micro-texture optimum geometric parameters has been obtained. Later, the structure strength has been given for cemented carbide micro-texture ball end mill by applying the gradual load. It follows results that the micro-texture placement has little impact on cemented carbide ball end mill. Finally, on the basis of previous research, milling experiment of the titanium allo y has carried out by preparing cemented carbide micro-texture ball end mill. The results show that the micro-texture plays a role in reducing wear and prolonging tool life.