Grinding is a highly complex manufacturing process due to the stochastic nature of the active zone (composed of grains, binder, and pores) and, because of the large numbers of parameters, it influences the surface quality and material removal rate, which are the two main goals of this process.An important grinding application is the sharpening of cemented carbide cutting tools. Additional features of these processes compared to other types of grinding are the following: the small surfaces to be processed, which have many edges; high surface quality; small production series; different depths of cut; and specific mechanical properties of the cemented carbides used for cutting tools. The application is important because the quality of the clearance and relief surfaces (of the cutting tool) is important for the precision of the manufactured surface and the tool life of the cutting tool.The research focused on DK460UF tungsten carbide that consists of 91 % WC and 9 % Co. It is the main material used in twist drills, gun drills, end mills, etc.The aim of this study was to determine the optimum manufacturing parameters that lead to the desired surface quality. STATE OF THE ARTGiven its importance, the grinding process has been the subject of many investigations. In his book [1], Shaw presents the first grinding models developed in the 1990s.Currently, a large range of models are being developed. Some of them are physically focused. In this category, we include the fundamental analytical models, the kinematic, finite element method, regression and molecular dynamics. Empirical process models include regression and artificial neural models. The last category comprises the rule base models, which are heuristic [2].Kinematic models explain the grinding mechanisms, the parameters involved in this process, and their interdependence. Fig. 1 shows an original cumulative model of the main elements influencing the grinding process and the logical interaction between them. Grinding Tungsten Carbide Used for Manufacturing Gun Drills
This paper presents a study on grinding tungsten carbide DK460UF, through experimental investigation using diamond grinding wheel with 54 μm grain size. Different sets of experiments were performed to study the effects of the independent grinding parameters such as grinding wheel speed, feed and depth of cut on cutting forces. Test results showed that the feed and depth of cut influence significantly the cutting forces. The research was lead to optimize the process parameters for reducing cutting forces. In this way, for different parameters of cutting regime, it were measured the values of the components of the grinding force, tangential component, Ft and normal component Fn. The results of the experiment showed that it is better to use great speeds and small feed rate and depth of cut in grinding tungsten carbides, such as DK460UF
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