GRINDING OF SHAPED SURFACES ON THE MACHINE VZ-208-F3
Authors:   Chernihiv National University of Technology, Pasov Hennadii , Venzhega Volodymyr ,   Chernihiv National University of Technology, Bakalov Valerii ,   Chernihiv National University of Technology
Published: January 2021

Urgency of the research. Grinding of the shaped surfaces on the equipment with wide technological possibilities enables productive and accurate processing of the complex parts. Its use in mechanical engineering is possible both in the main production and in repair and restoration. Target setting. At present, one of the ways out of a grave crisis is the formation of machine building and metalworking. In the total volume of metal processing, the percentage of parts with complex surfaces continuously increasing, which significantly affect the technical and economic performance of machines. These details include: blades of gas and steam turbines, asterisks of cars differentials, molds, rolling rolls of rolling mills, body parts of ships, missiles, planes, disk, cylindrical, end cam, and others. Actual scientific researches and issues analysis. Special difficulties in the processing of shaped surfaces results in the processing of precision shaped surfaces in the conditions of mass production as well as mass production. The treatment of these surfaces differs from the treatment of simple surfaces with vividly detected non-stationary, the level of which significantly influences the choice of the technological process of processing these surfaces, as well as equipment for their processing. Therefore, before choosing technology and equipment, it is necessary to analyze the patterns that are inherent in the processing of shaped surfaces. Taking into account the change in the range of treated surfaces, as well as to improve the accuracy of processing, it is advisable to use numerically controlled machine tools. Uninvestigated parts of general matters defining. In the process of removing the drop and shaping the required surface, the tool moves not in the normal. On a machine model MA-369-Ф3 the grinding wheel moves only in one direction, that is, will be reciprocating motion. It is necessary to take into account the radius of the grinding wheel. It is necessary to offer such equipment, which will solve this problem. The research objective. The purpose of this work is researchіng the opportunity of shaped surface grinding on the machine VZ-208-F3. The statement of basic materials. On the machine model of the VZ-208-F3 is the ability to handle the grinding wheel, which moves in two coordinates, that is, a plan of processing with plane-translational motion is carried out. With a reciprocating motion, the removal of the abutment will be carried out in parallel curves, while plane-translational - by the equidistance. In the process of processing, the grinding wheel is constantly wearing out and requires periodic editing, which must be taken into account when compiling the control program, ie each working circuit must be programmed separately. On the machine VZ-208-F3 (plane-translational motion) is possible to exclude the influence of the radius of the grinding wheel, and, consequently, its wear, on the accuracy of shaping. In this case, the control program requires periodic additional supplies, the processing contour does not change. At the finishing process there is a constant refinement of the processing profile. Conclusions. It is possible to process details of the type of cam on the machine VZ-208-F3 with CNC 2С42 with the plane-translational processing scheme. The developed method allows to improve the accuracy of processing by removing the admission by the equidistant curves, not taking into account the radius of the grinding wheel. The control program is greatly simplified, since it requires only one cam profile and periodic additional traps that take into account the wear and tear of the grinding wheel and its editing. The proposed treatment method can be used in serial production, where it is often necessary to switch to diverse products, as well as during repair and restoration works.