CONCEPTS OF HIGH-PRECISION MECHANICAL MACHINING OF OPENINGS IN MACHINE PARTS

Abstract

Theoretically, the conditions for increasing the accuracy of hole machining when using dimensional and non-dimensional blade tools and during grinding are theoretically determined. It is shown that when machining holes with uneven allowance with axial tools, elastic displacements are formed that reduce the accuracy of the machining. Therefore, it is advisable to process holes in several passes with drills with different diameters, increasing the diameter from the passage to the passage. It is shown that the main parameter determining the processing error is the misalignment of the axial tool and the machined hole. It has been theoretically established that when machining holes with measuring tools, for example, during boring, it is much easier to provide the required accuracy than when machining with an axial tool. To do this, it is necessary to increase the cutting speed and reduce the feed and depth of cut and apply high-performance cutting tools from STM. When milling holes, you can achieve even greater increase in the accuracy of its processing. It is shown that the main condition for high-precision machining during internal grinding is to reduce the energy intensity of the cutting process by reducing the friction intensity in the cutting zone.