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In this article, the influence of coatings of the type (Ti—Zr)N—TiN, TiN—ZrN and ZrN—(Ti—Zr)N—TiN obtained by physical vapor deposition on the wear resistance of T15K6 cemented carbides plates during longitudinal turning blanks from stainless steel 12X18H10T is considered. It has been experimentally established that the presence and composition of the coating on the working surfaces of the tool in all cases contributes to a significant decrease in the wear rate of cemented carbides inserts. According to the research results, the composition ZrN—(Ti—Zr)N—TiN should be considered the best option. During the cutting process, for a tool with this type of coating, the minimum wear along the flank surface and the length of chip contact with the rake surface, as well as the smallest values of the shear angle in the zone of primary plastic deformations, were recorded.

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The analysis of the technological parameters of the finishing and strengthening of spline holes by shaped mandrels is performed. It is shown that the main technological parameter determining the processing efficiency is pull. Technological scheme for the mandrelling of spline holes of gear wheels is proposed, which ensures its reduction by applying ultrasonic field to the workpiece.

A technological scheme for calibrating holes in parts such as a bushing, discs, a gear wheel, in the conditions of applying ultrasonic effects on the part it has been experimentally established that, the accumulation of holes in critical parts with the imposition of ultrasonic vibrations on the part significantly reduces the surface roughness, the scattering field of the diameter of the holes and the dorning force.