The subject of research – technological processes of internal longitudinal grinding of internal surfaces of liners of internal combustion engines, hydraulic and pneumatic cylinders. The object of research – patterns take place during the processing of the internal surfaces of the sleeves of internal combustion engines and hydraulic and pneumatic cylinders, of which is perpendicular to the axis of the grinding wheel. The thesis is an integral completed study devoted to the solution of the scientific and practical task of substantiating the conditions for improving the quality of processing of internal surfaces of sleeves of internal combustion engines, hydraulic and pneumatic cylinders, which is relevant for mechanical engineering technology based on the development and practical application of an effective technological process of internal longitudinal grinding with a perpendicular arrangement of the grinding axes circle and machining hole of the cylinder. The scientific novelty of the obtained results lies in the fact that based on theoretical and experimental research, the recipient for the first time: - the possibility of improving the sleeves of internal combustion engines operational characteristics, pneumatic and hydraulic cylinders due to the improvement of their working surfaces quality processed by internal longitudinal grinding with the perpendicular arrangement of the grinding wheel and the workpiece axes has been confirmed; - a mathematical model of the grinding surface roughness was developed, taking into account the coincidence of the direction of the lines-scratches, formed by the actions of the grains of the wheel, and the direction of the movement of the piston during operation;
- the justified effectiveness of applying an elastic grinding scheme with a mutually perpendicular arrangement of the wheel and the treated hole axes allows you to control the power and thermal stresses in conditions of intensive wear of the tool and to eliminate defects that were formed during previous operations; - found the further development of regularities confirm that with a single-layer placement of abrasive grains on the wheel working surface a RR /max , the ratio of surface roughness parameters can vary significantly, and the surface roughness parameter a R can reach a value of 0,05 μm, which corresponds to the parameters obtained after abrasive polishing , and indicates the effectiveness of using soft wheels with a glued layer of abrasive powder, which allows you to significantly increase the contact area between the wheel and the workpiece. The practical significance of the obtained results lies in the fact that, based on the theoretical and experimental studies, effective technological processes for finishing the internal combustion engines sleeves internal surfaces, pneumatic and hydraulic cylinders have been developed using a modern progressive method of internal longitudinal grinding with a perpendicular arrangement of the axes of the grinding wheel and the treated hole. Engineering methods for calculating rational structures and parameters of technological processes of finishing mechanical processing of internal surfaces of sleeves of internal combustion engines, hydraulic and pneumatic cylinders have been developed, which ensure a significant increase in quality, accuracy, productivity and reduction of processing time. The developed technological processes of finishing mechanical processing of internal combustion engines sleeves internal surfaces, hydraulic and pneumatic cylinders have been introduced into the main production of “Imperia Metaliv” LLC company with a positive economic effect. The results of theoretical and experimental studies of the thesis are used in the educational process in course and diploma design at the Department of Mechanical Engineering Technology of the Pryazovsky State Technical University and at the Department of Mechanical Engineering and Metal Cutting Machines at the Kharkiv Polytechnic Institute.
The technical novelty of the developments is protected by 1 utility model patent. The theoretical and practical results obtained during the research were implemented in the practice of the educational process of the Department Department of Automobiles and Automotive Industry, Faculty of Combat Use of Troops of the Hetman Petro Sahaidachnyi National Army Academy (specialty 255 – Armament and military equipment).
Key words: treatment of internal surfaces of sleeves of internal combustion engines; internal longitudinal grinding; hydraulic and pneumatic cylinders, perpendicular axis of the grinding wheel.
