High temperature bearings are required in many occasions in the machinery industry, such as ovens, furnaces, kilns, paint machines, etc., especially for material conveying equipment that works at higher temperatures. This article mainly discusses the design and application of high temperature deep groove ball bearings. High temperature deep groove ball bearings are mostly used for cooling beds in steel mills, and the bearing speed is generally low, usually below 100r/min. The high temperature resistant deep groove ball bearing cage adopts the form of isolation block. Due to the high temperature of the working environment, the graphite cage has good self-lubricating performance. When the bearing is running, the graphite powder falls off, and the grooves and steel balls are lubricated. At the same time, the bearing adopts large clearance, which can prevent it from locking under high temperature or after rapid cooling. In order to prevent solid impurities from entering the inside of the bearing, there are dust covers on both sides, and at the same time, the graphite spacer in the bearing can be guided axially. This type of bearing can withstand radial loads and axial loads in two directions. The surface of the ferrule, steel ball, and dust cover are all treated with anti-rust treatment, which can prevent high-temperature rust and improve the running performance. A high temperature bearing is designed for deep groove ball bearings in high temperature environment. In the design, high temperature resistance, anti-corrosion, rust prevention, heat dissipation, anti-locking and other conditions are fully considered, and the surface is specially treated, with a large internal The clearance is equipped with a special high-temperature-resistant cage. According to different working conditions, the cage has a wave-shaped cage, a trapezoidal spacer, and an axial limit spacer. 1 Structure type The inner diameter of the inner ring of the high temperature resistant deep groove ball bearing is a straight hole, and the working temperature range is -40 ~ 250 ℃. When the temperature exceeds 200 ℃, solid lubricant should be used. According to different operating temperatures, different heat treatments are required for the ferrules. The bearing operating temperatures corresponding to S0, S1, S2, and S3 in the code are 150, 200, 250 and 300 °C, respectively. In the code, F2 is a graphite cage; 2Z is ​​with a dust cover; C9 is a non-standard clearance; YA8 is a different cage design. There are mainly the following types of designs. (1) The most commonly used high-temperature bearing is 6000/S2, which is equipped with a stamped wave-shaped cage, without any dust-proof parts, and adopts high-temperature grease. (2) High temperature bearing with dust cover 6000-2Z/S2, the main parameters of this bearing are basically the same as 6000/S2 bearing, but with dust cover on both sides. In addition, the bearing is pre-installed with double the amount of grease for the 6000/S2 bearing at the factory. (3) Bearing 6000F2-2Z/C9S2 is used at higher temperature. The bearing adopts graphite spacer block, which not only acts as a cage, but also provides lubricant. The working temperature is -150 ~ 350 ℃. Dust caps on both sides of the bearing can guide the graphite spacer axially and prevent the intrusion of contaminants. Another advantage of this bearing is that it is environmentally friendly and does not emit harmful gases even at extremely high temperatures. (4) Used in the high temperature bearing 6000F 2 - 2Z / C9S2YA8 which needs to be axially positioned. Compared with the 6000F2 - 2Z / S2 bearing, the bearing has pockets on both sides of the spacer block, so that it has the function of axial limit, which can Prevent shock to the dust cover. 2 Common data and data The external dimensions of high temperature deep groove ball bearings meet the requirements of GB/T276-1994 'Rolling Bearings Deep Groove Ball Bearings External Dimensions'. Deep groove ball bearings are manufactured according to ordinary tolerances and conform to GB/T 307. 1-2005 'Rolling Bearings Radial Bearings Tolerances'. The actual size may be slightly outside the standard tolerance range due to surface treatment, etc., but it will not affect the installation and use of the bearing. The radial clearance of high temperature deep groove ball bearings is non-standard and only suitable for bearings that are not mounted and have no measured load. 3 Alignment error Since the radial clearance of the high temperature bearing is large, the shaft and the shell are allowed to have a large alignment error and angle error. The inner and outer rings of the high temperature deep groove ball bearing are allowed to have an angle error of 20′～30′, but it is only suitable for the case of low speed. At high speed, due to the adverse effect of the alignment error on the rolling of the bearing, a large error is not allowed. 4 Speed ​​High temperature deep groove ball bearings are suitable for low speed (below 10r/min) working conditions. However, the practical experience has proved that the bearing can run for a long time at a speed of 20r/min without maintenance. If it needs to be used in higher speed conditions, the design of the cage needs to be improved. 5 Design of related parts For high temperature resistant deep groove ball bearings with spacers, since the dust cover guides the graphite cage in the bearing in the axial direction, the dust cover can be supported by related parts to prevent it from falling off. . For example, make the diameter of the boss or the positioning cylinder of the bearing seat smaller than the diameter D2 of the outer ring seal groove, and also add a gasket of suitable size between the boss or the positioning cylinder and the bearing. 6 Selection of bearing size and specification When the bearing is at high temperature, the load carrying capacity is reduced. Using the temperature coefficient, the basic static load rating of the bearing at different temperatures can be adjusted. 7 Maintenance of high temperature resistant bearings The closed high temperature resistant ball bearings have been filled with lubricant and can be lubricated for life.Maintenance free. However, when using open high temperature deep groove ball bearings, inspection should be carried out half a year after operation. When checking, you only need to open the bearing seat, such as the transport car used in the oven, you can remove the wheel and the bearing from the journal, and then use a blower to blow away the impurities in the bearing. If there are some bright marks on the channel of the bearing, it indicates that there is a lack of lubricant in the bearing, and the original lubricant should be replenished in time. Two application of high temperature bearing
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