ВИРТУАЛЬНОЕ ФОРМООБРАЗОВАНИЕ ОБРАБАТЫВАЕМОЙ ПОВЕРХНОСТИ ПРИ КРУГЛОМ НАРУЖНОМ ШЛИФОВАНИИ С ОСЕВОЙ ПОДАЧЕЙ

Abstract

PURPOSE. The paper deals with the model of shaping a processed surface in the operation of external cylindrical grinding with a traverse feed performed in an automatic cycle on CNC machines. The developed model of surface formation allows to conduct a step-by-step calculation of the current values of the actual radial in-feed and radii sizes in the different sections of the machined surface and predict the values of grinding surface dimensions throughout the whole grinding cycle for the given processing conditions. METHODS. The basis for the creation of computer-aided design systems serve the data presented in the regulatory literature that makes their use inefficient for the development of cycles for CNC machines. Existing engineering techniques also based on the recommendations of regulatory literature or on particular empirical data do not take into account the changes in variable processing conditions. RESULTS AND THEIR DISCUSSION. The paper discusses the simulation features of grinding cycles along the length of the machined part surface, shows a calculation scheme that establishes the relationship between the graphs of the accumulated software (tп k,i,z ) and actual (tф k,i,z ) feeds, tension (tн k,i,z ), elastic strain (у k,i,z ) of the technological system with the radii of the machined surface (R k,i,z ) when grinding a non-circular workpiece with the maximum radius (Rзаг max ), original workpiece radii (Rзаг k ) and initial radial run-out, which is calculated by formulas. CONCLUSIONS. Presented in the article formation model of the grinding surface in the operation of external cylindrical grinding with a traverse feed performed on a CNC machine allows to predict the actual dimensions of the machined surface for a given cycle and technological conditions of machining as well as to construct a model of the machined surface.