STUDY OF SURFACE ROUGHNESS DURING CONTOUR MILLING OF DIFFICULT PROFILE SURFACES OF STAINLESS STEEL PARTS

Abstract

The improvement of technologies for contour milling of complex-profile surfaces is realized thanks to the competent management of cutting conditions. Cutting conditions have a significant impact not only on productivity and processing costs, but also on the accuracy and quality of the machined surface. The surface roughness Ra determines the characteristics of wear resistance and streamlining by gases and liquids, the value of fatigue resistance, contact brutality, vibration resistance, and cor-rosion resistance. As a result, at the stage of development of the working design of the product, it is important to determine the rational value of the surface roughness Ra and ensure the specified value in finishing operations during the execution of the technological process. In the course of the work, the analysis of scientific articles on the influence of cutting conditions on the value of surface roughness during contour milling of complex-shaped surfaces was carried out. In the cited works, practical recommendations were given on the choice of the cutting pattern and the direction of the contour bypass in the finishing operations of milling of complexly shaped surfaces with a spherical tool, the assignment of the tool path, the use of cycles for finishing the angles of mating surfaces as part of the control program, which make it possible to improve the quality of the machined surface, were de-veloped universal control routines for correcting the position of the tool and cutting conditions depending on the amount of elas-tic displacement of the cutter. However, the purpose of the normative combination of controlled parameters of the cutting mode, providing the required surface roughness, according to analytical expressions, was not considered in the above studies. To solve this problem, a full factorial experiment was planned to obtain a mathematical model that makes it possible to predict the value of roughness at various processing modes (V, Sz, B).