Self-lubricating bearings have a wide operating temperature, sufficient solid lubricating material content, uniform release, good self-lubricating performance and occlusion, which can effectively protect the journal and achieve lasting use. It is suitable for running in the environment of high temperature, low speed, heavy load, heavy dust, water shower and shock and vibration. It can be widely used in the rolling of mining machinery, metallurgy, petroleum, chemical industry, food, textile, papermaking, printing and dyeing and other machinery and equipment. and sliding bearing parts. The aluminum liquid produced by the aluminum electrolytic cell is sucked out by vacuum ladle and poured into the mixing furnace. After proportioning and slag removal, it flows into the aluminum ingot casting machine for casting and molding. The formed solid is called aluminum ingot. The ingots are stacked by a stacker. In order to improve the production efficiency, the aluminum ingot must be cooled with a large amount of cooling water before forming. During the cooling process, the huge heat energy of the molten aluminum is released into the cooling water, producing hot water vapor. Casting machine bearings are in a high temperature and water vapor environment. Most of the bearings are lubricated by grease. The added grease will melt and overflow due to high temperature in a short period of time. It is difficult to maintain and clean the surface of the equipment. In addition, steel structure bearings are easy to corrode and rust in hot and humid environments, the failure rate is very high, and the equipment maintenance costs are high. The equipment operation is often plagued by the following two problems. Oil supply operation is difficult to achieve high temperature continuous operation. The ingot pulling, ingot moving, ingot receiving, ingot turning and other devices of the casting machine are all installed in the unit casing, and each rotating bearing is designed with a grease nozzle facility for regularly injecting lubricating grease. Remove the casing and apply grease with a grease gun. In addition, there are more than 30 oil filling points in the whole machine. This kind of tedious oil filling operation cannot be realized in long-term operation and maintenance. It is necessary to hold a thin oil pot and pour it on the outside of the running bearing sleeve. It is difficult for the lubricating oil to enter the friction pair of the bearing. Some bearings are in friction. The ambient temperature is high, and the grease lubrication is not suitable for the current molybdenum disulfide grease used in the rolling bearing of the casting machine. It is considered to be able to withstand high temperature grease. We know that its base oil is a petroleum product. That is 120℃. According to the measurement, the working temperature of the bearing of the casting machine can reach 200 ℃, which has far exceeded the temperature resistance limit of the grease. Under such high temperature conditions, the base oil in the grease will be thinned and gradually evaporated, and the remaining carbon residue, molybdenum disulfide, and dust will be mixed into solid blocks and solidified on the cage of the rolling bearing, which not only loses its lubricating effect, but also loses its lubricating effect. It also hinders the normal operation of the rolling bearing and wears out quickly. It has to be shut down for at most 2 weeks, and the bearing is removed, cleaned and replaced with new grease. 1. Wear condition The abnormal wear of the bearing caused by the two major problems in the operation of the aluminum ingot casting equipment is more serious. Taking the ingot pulling mechanism of an aluminum enterprise as an example, the average service life of the bearing is 2 months. When the wear is serious, the inner ring of 5mm is worn through, so that the equipment cannot continue to run. The reason for the uneven wear is that the original design of the oil supply method cannot be realized, and the thin oil has to be drenched outside the running bearing. A small amount can be drenched and burned into the bearing, and the wear is small. The shaft and sleeve are not lubricated, but are in a dry friction state to produce strong adhesive wear. This kind of wear quickly increases the play gap between the shaft and the sleeve, and the dust is more likely to enter, resulting in a vicious circle. 2. Selection of oil-free self-lubricating bearings In order to solve the lubrication problems of high temperature, low speed, heavy load, large dust, water shower and shock vibration in mechanical equipment, oil-free self-lubricating bearings are selected. 1. The structure of the bearing Self-lubricating bearing is to develop and arrange holes of appropriate size on the metal friction surface of the bearing matrix, and embed molybdenum disulfide, graphite, etc. to make a composite self-lubricating block inlaid on the metal sleeve to make a composite self-lubricating block. Bearings, the friction area of u200bu200bsolid lubricants reaches 25-65%. The solid self-lubricating block can work normally at a high temperature of 280°C. However, due to its low mechanical strength and weak bearing capacity, it is easy to deform, and this defect can be suppressed by embedding it in the metal hole groove, forming the metal part to play a bearing role, and the self-lubricating block to play a lubricating role. The lubrication mechanism of this kind of self-lubricating bearing is that during the sliding friction between the shaft and the sleeve, a part of the molecules of the self-lubricating material is transferred to the metal surface of the shaft, filling the small unevenness and forming a relatively stable solid lubricating film. , causing the friction between the solid lubricating films to prevent the adhesive wear of the shaft and the sleeve. This rational combination combines the respective complementary advantages of copper alloys and non-metallic wear-reducing materials, and is especially suitable for motion amplitudes in oil-free, high temperature, high load, low speed, anti-fouling, anti-corrosion, strong radiation environments, and It is used under special working conditions where it is impossible to add lubricating grease at all due to water or other solutions.