滑动轴承材料（Journal bearing materials）

滑动轴承材料（Journal bearing materials） 滑动轴承材料(Journal bearing materials) Three, the types and uses of bearing lining materials 1, gray iron It is suitable for low speed, light load and no impact load, and the common materials are HT15-33, HT20-40 2 and copper base bearing alloy Its main component is copper, which is commonly used in the phosphor bronze (ZQSn10-1) and aluminum bronze (ZQAC9-4). Tin bronze is a good antifriction material with high mechanical strength. It is suitable for working under medium speed, heavy load, high temperature and impact load. Aluminum bronze has good scuffing resistance, abrasion resistance and corrosion resistance, and is more suitable for the assembly process of plain bearings Wang abstract Types, characteristics and application requirements of sliding bearings, casting requirements and methods of bearing alloys, assembly requirements, techniques and matters needing attention of sliding bearings. Key words: plain bearing, bearing alloy, assembly process Objective: to further understand the characteristics of sliding bearing and its installation process requirements. Assembly process of plain bearing I. materials for plain bearings Bearing liner direct contact with the journal, in order to ensure the good performance of sliding bearings, except must have the appropriate measures of lubrication, bearing material properties should also meet the following requirements: (1) to have sufficient strength and plasticity, the bearing lining can bear certain work pressure. And that between it and the axis pressure distribution; (2) a good running, antifriction and wear resistance, so as to prolong the service life of the bearing lining; (3) lubrication and good heat dissipation; have good craft skills. Four, the types and uses of bearing lining materials 1, gray iron It is suitable for low speed, light load and no impact load, and the common materials are HT15-33, HT20-40 2 and copper base bearing alloy Its main component is copper, which is commonly used in the phosphor bronze (ZQSn10-1) and aluminum bronze (ZQAC9-4). Tin bronze is a good antifriction material with high mechanical strength. It is suitable for working under medium speed, heavy load, high temperature and impact load. Aluminum bronze has good scuffing resistance, abrasion resistance and corrosion resistance, and is more suitable for working under steam and seawater conditions. 3, oil bearing It is made of bronze, cast iron powder, proper graphite powder moulding, porous material with high sintering temperature, then it is soaked in lubricating oil of 120 DEG C, after removal of cooling to room temperature, oil will be stored in the porous bearing. When the shaft rotates in the bearing neck, axial sucking action and friction heat, oil lubrication and expansion into the friction surface; the shaft stops running, the oil for cooling and penetrate into the pores of the bearing. contain Oil bearing low price, but also save non-ferrous metals, but the performance is fragile, it is not appropriate to withstand impact load, often used in low-speed or medium speed, light load, inconvenience lubrication situation. Such as lubricating measures plus, also can replace the copper bushing under heavy load and high speed work. 4 nylon bearings Commonly used nylon 6, nylon 66 and nylon 100. Nylon bearings running well, the debris after wearing soft and without injury to the shaft neck, corrosion resistance, and can use water or other liquid lubrication advantages, but poor thermal conductivity, water will swell. 5, bearing alloy (Babbitt) It is an alloy of tin, lead, copper, antimony and so on. Bearing alloy has good abrasion resistance and wear resistance, but the strength is low, it can not be made into Bush alone. It is usually cast on the base of bronze, cast iron and steel. Commonly used there are two kinds, namely: tin base bearing alloy (ZChSnSb11-6), the main component is tin. Lead base bearing alloy (ZChPbSb16-16-2, ZChPbSb15-5), its main component is lead. Tin based mechanical properties and corrosion resistance are better than lead based but expensive, often used in heavy duty, high speed and temperature less than 110 degrees of important bearings, such as steam turbines, large motors, internal combustion engines and high-speed lathes. 6, three layer composite bearing materials The three layer composite bearing material is a self-lubricating material which is made of steel plate as base, steel powder as interlayer, plastic as friction surface layer, and solid combination in one. The utility model has the advantages of being compatible with two kinds of materials, metal and plastic, and has higher strength, Good self lubrication. There are two kinds of domestic PTFE steel back composite and POM steel back composite. PTFE steel back composite is a kind of non oil lubricating materials, can be used as high load (1400kg/cm2) high temperature (270 DEG C) and low temperature (-195 C), where vacuum, water and water solution and other corrosive medium without oil lubrication. Polyformaldehyde steel back composite boundary lubrication material, the surface is POM, assembly surface coated with grease, long service life, can be extended lubrication intervals, especially suitable for high load, low speed rotation, rolling motion, intermittent motion, impact fatigue or micro vibration and other gas difficult the occasion. Suitable temperature is used at -40 DEG C and --100 DEG C. Intermittent use of up to 130 degrees of temperature. Five 、 casting of bearing alloy Bearing alloy must be cast on the base of bearing shell to be used properly. Because of the different bearing materials, the viscosity and capacity of the bearings are different, and the strength and strength of the adhesive are reduced by bronze, low carbon steel, cast steel and cast iron. For the material with poor adhesion and poor ability, the dovetail groove or drilling holes can be machined on the surface of the Bush to increase the bonding strength. 1. Clean the bush Whether the bearing surface of casting bearing alloy is clean or not, it greatly affects the bonding quality between it and alloy. Therefore, the Bush must be cleaned up. Remove oxide dirt available emery cloth, steel wire brush, blasting method. Oil can be used 80 DEG --90 DEG caustic soda solution rinse ten minutes, rinse with 80 DEG --100 DEG hot water, drying out. When the rust of the Bush is serious, wash it for 5 to 10 minutes with 10-15% dilute sulfuric acid or dilute hydrochloric acid, then rinse in hot water and rinse with cold water and dry. Work under steam and sea water conditions. 3, oil bearing It is made of bronze, cast iron powder, proper graphite powder moulding, porous material with high sintering temperature, then it is soaked in lubricating oil of 120 DEG C, after removal of cooling to room temperature, oil will be stored in the porous bearing. When the shaft rotates in the bearing neck, axial sucking action and friction heat, oil lubrication and expansion into the friction surface; the shaft stops running, the oil for cooling and penetrate into the pores of the bearing. contain Oil bearing low price, but also save non-ferrous metals, but the performance is fragile, it is not appropriate to withstand impact load, often used in low-speed or medium speed, light load, inconvenience lubrication situation. Such as lubricating measures plus, also can replace the copper bushing under heavy load and high speed work. 4 nylon bearings Commonly used nylon 6, nylon 66 and nylon 100. Nylon bearings running well, the debris after wearing soft and without injury to the shaft neck, corrosion resistance, and can use water or other liquid lubrication advantages, but poor thermal conductivity, water will swell. 5, bearing alloy (Babbitt) It is an alloy of tin, lead, copper, antimony and so on. Bearing alloy has good abrasion resistance and wear resistance, but the strength is low, it can not be made into Bush alone. It is usually cast on the base of bronze, cast iron and steel. Commonly used there are two kinds, namely: tin base bearing alloy