Технологічне забезпечення якості виготовлення сложнопрофільних поверхонь турбінних лопаток з титанових сплавів

Abstract

Dissertation for the degree of candidate of technical sciences in specialty 05.02.08 - mechanical engineering technology. - National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2021. The thesis is devoted to solving the urgent problem of quality assurance and reducing the labor intensity of processing complex-profile surfaces of turbine blades made of titanium alloys. On the basis of a systematic analysis of the problem of ensuring the quality of manufacturing parts from difficult-to-machine materials in turbine engineering, the basic technological process of processing stainless steel blades implemented was improved and a rational structure was formed for a new one for processing blades from titanium alloys while ensuring quality and reducing the labor intensity of processing. The rejection of the physical model (reference copier part) for copy-milling operations of the basic technical process with the transition to a computer model and processing on CNC machines of the new technical process made it possible to significantly reduce the labor intensity of technological preparation of production and ensure the quality of processing. To ensure the constancy of the removed allowance of the complex-profile surfaces of the working part and to minimize it, modern methods and means of control operations have been introduced. Using the method of multifactorial planning of experiments, the study of the finishing operation of grinding the surfaces of turbine blades made of titanium alloys was carried out, which made it possible to develop recommendations for choosing the optimal cutting conditions. In the process of research, recommendations were given and the modernization of technological equipment was carried out. All this made it possible to reduce the labor intensity of manufacturing a blade by 30%, to reduce the production cycle of a set (100 pieces) for one row of a turbine by half.