Du X. Technological support of strength and durability at the manufacture and repair of component parts for branch mechanical engineering

This dissertation is dedicated to solving practical scientific and technological problems in the branch mechanical engineering field: Friction causes a large number of mechanical products to be damaged. Human beings have been exploring theories and methods to prolong the life of mechanical equipment and parts. The research of wear mechanism has positive significance for improving the life of mechanical parts and repairing parts. Wear is generated on the surface of mechanical equipment. The failed parts can be repaired by surface processing technology. Surface processing technology has been used in remanufacturing engineering. The research of wear and wear-resistant materials has always been the most active field of tribology research. The development of new materials and processes has been the hotspot of wear application research. The application research of surface coating and surface modification has become the most active field of tribology research. The present research focuses on wear caused by linear reciprocating motion in an open environment. It explores the theory and methodology of using remanufacturing technology to continuously improve the wear resistance and enhance the life of parts. One of the difficulties in wear research is the research on the anti-wear and anti-friction properties of coatings under extreme conditions. With the rapid development of composite surface coating theory, new coating theories appear. It is of great significance to redesign the anti-wear and anti-friction coating by using the new theory. Since electro-spark deposition (tantamount to electro-spark alloying) has the characteristics of energy saving and environmental protection, low use cost and convenient operation, it is of positive significance to combine ESD technology with composite coating theory to explore new coatings. In this study, high toughness materials, high wear-resistant materials, and friction-reducing materials are used for composite, in order to explore new friction-reducing and wear-resistant coatings. The development of pneumatic impact deposition technology can improve the traditional deposition process and greatly improve the quality of friction-reducing coating, which is a new attempt in science. This new composite coating solution reduces energy consumption and pollution, which is important for low wear and high service life of mechanical equipment. It has promotional value for parts with the same wear mechanism. It is also very important to save a lot of resources and reduce a lot of business money. The object of research is a technological process for forming functional coatings on the pin shaft of the locking mechanism for the lifting device. The subject of research is the regularities of the technological process for forming a surface with specified performance properties, which ensure the necessary quality (durability, wear resistance, workability) of the pin shaft surface of the locking mechanism for the lifting device. The purpose of the study is to improve the quality of the surface layers at manufacturing and remanufacturing the pin shaft of the locking mechanism for the lifting device of an electric car battery by forming the composite multilayer coatings of the SKH51+WC+B83 composition on its wear surfaces with the use of the method of electro-spark deposition. To achieve this goal, it is necessary to solve the following tasks: 1. To conduct an analysis of the existing modern methods and technologies for repairing component parts for branch mechanical engineering in accordance with the ESD characteristics. 2. To conduct an analysis of modern materials for electrode – tools to provide for a comprehensive assessment of the properties of the surface coatings applied to improve the overall technical characteristics of the surface. 3. To conduct a research on the formation of wear-resistant composite coatings and compare various surface properties. 4. To conduct a research of the defects of low-temperature soft metal deposition and improve the existing repair technology. 5. To investigate the effect of the ESD coating repair technology on the accuracy of the surface obtained. 6. To introduce the research results into the engineering practice of enterprise remanufacturing.