Архітектура дискретного покриття робочих поверхонь інструменту для різних схем різання

The development of the aerospace and automotive industries is linked to the use of fibre polymer composites. In order to increase the wear resistance of tools for machining these materials, discrete coatings of a globular structure are used on the working surfaces of the tools. The loading of the cutting edges of such tools with a discrete coating of globular structure depends not only on their materials and coating, but also on the cutting pattern, which corresponds to microcutting by coating elements. According to this scheme, the position of globules along the edges and discrete areas perpendicular to them are determined. This paper investigates the influence of the cutting pattern on the location of these areas. We have considered a single blade tool where the discrete areas of coating are arranged in a checkerboard pattern along the cutting blade to give the effect of a continuous coating. Also under consideration is a multi-blade tool where the displacement of the areas is in groups as a function of the depth of cut. It is shown that when changing the number of discrete sections for milling cutters with a blade length of 2 mm, the number of sections in a row decreases as the diameter of the cutter increases, i.e. as the angle θ decreases. Increasing the coating thickness for the same values of cutter diameters also causes a decrease in the number of discrete areas, which is associated with an increase in their size. An increase in the number of cutter teeth for the same diameter and coating thickness leads to an increase in the number of areas along the blade, which is explained by the number of teeth in the group. Since the disc cutters considered in the paper have a discrete coating of globular structure applied to the entire working surface of this tool, in order to determine the force load on the cutting part, it is necessary to know the number of discrete areas located both on the cutting part of the cutters studied and on their ends. The paper calculates the number of globules on each discrete section of the cutter, which enables the calculation of the tool load at which the coating does not break under the processing conditions studied.