Describe the advantages and current technical level of using additive technologies such as brazing, laser cladding, arc spraying, arc surfacing to replace conventional centrifugal casting to manufacture sliding bearings, and the high-temperature creep-resistant babbitt alloy developed with additive manufacturing technology. Wire composition, the current status of fine wire processing technology with a wire diameter of 1.6 mm, and the prospect of the application of additive manufacturing in the field of sliding bearings and the development trend of Babbitt alloy wire composition optimization and related supporting technologies, whether the superfine SnSb phase will accelerate the wear of the shaft diameter And the question of whether multiple arc surfacing additions will affect the bond strength is discussed. The sliding bearing with tin-based babbitt alloy as the anti-friction layer is suitable for low speed and heavy load conditions, and has the advantages of high precision, good vibration resistance, stable and reliable operation, low noise and long life. The traditional technical means is to use centrifugal casting or gravity casting on the steel back of carbon steel to produce steel back-babbitt alloy bimetallic bearing bushes. Although the casting technology is mature, it has the following shortcomings: the bonding strength is low and unstable, the casting layer is thick (generally more than 13 mm), the structure is coarse and segregated, cracks and shrinkage holes, etc.; Melting, tin hanging on steel back, melt injection into casting cavity, centrifugal casting, cooling water spraying, rough machining and finishing of machine tools, etc., consume a lot of energy and materials; Environment Safety Health (ESH) is not ideal , the casting process is more affected by human factors, resulting in low quality consistency; there is a clear gap with foreign countries in terms of service life and reliability. The use of additive manufacturing technology is in line with the inevitable trend of the development of bearing bushes, which can solve many shortcomings in casting, especially to shorten the process flow. The thickness of the additive layer is only 25%~30% of the casting layer, saving 70%~75% of the pasteurization Alloy materials, human factors are reduced, ESH is more friendly, and can promote the upgrading of industry technology. In recent years, the manufacturing of sliding bearings has developed rapidly, and processes such as brazing, spraying, surfacing, and additive materials have been continuously iterated, which has greatly promoted the development of sliding bearing materials and even parts manufacturing in China. Additive manufacturing is a process of manufacturing parts or objects through material accumulation based on 3D model data. Both spraying and surfacing can be used for additive manufacturing, but the choice needs to be made around increasing the thickness, performance, efficiency and precision of the material. If the thickness of the coating is only micron, it is generally regarded as surface treatment, and spraying is more applied to surface treatment. If the thickness reaches millimeters or even larger, more materials are added, which is more suitable for additive manufacturing. In addition, additive manufacturing shortens the processing process of complex-shaped parts, such as multiple alloy surfaces are completed continuously with one equipment and one process. As a heating source, lasers are widely used in surface treatment and can also be used in additive manufacturing. The following is a detailed description of the current status of the application of domestic arc additive manufacturing technology in the field of bearing bushes, the research on the composition of supporting tin-based babbitt alloys and the level of wire manufacturing technology, and the application of additive manufacturing in the field of bearing bushes, tin-based babbitt alloy wires. And the development trend and existing problems of related supporting technologies. Development of bearing bush additive manufacturing technology at home and abroad 1.1 At the beginning of the 21st century abroad, Morgan Precision Bearing Company of the United States invested and established Morgan Oil Film Bearing (Shanghai) Co., Ltd. in Shanghai, and took the lead in using oxygen-acetylene automatic brazing equipment in China A layer of tin-based babbitt is added on top. The main equipment, brazing wire and auxiliary materials are imported from the United States, mainly for steel rolling machinery. Although this technology is more advanced than casting technology, it requires a strict cleaning process before brazing and needs to apply special flux on the steel back, which increases the production cost and is suitable for large and medium-sized sliding bearings, so the scope of application is limited. Mitsubishi and Datong also developed spraying and arc surfacing processes in the early days, but their applications were limited. Due to the technical confidentiality of foreign companies, the application of current foreign technology is still unclear, but judging from the raw materials of babbitt, its application technology is mainly spraying and tungsten inertia gas (TIG) arc surfacing technology. German RENK company is also developing new additive manufacturing technology in the application of babbitt wire for bearing repair technology. 1.2 Domestic 1.2.1 Early repair applications Tin-based babbitt has a low melting point and is easy to braze. Oxygen-acetylene brazing was first used for the repair of large and medium-sized sliding bearings, such as defects after centrifugal casting bearing processing or tin-based babbitt The alloy layer is partially worn and peeled off, and brazing is manually operated, which is limited to repairing sliding bearings, and cannot replace casting technology and achieve large-scale production.