High and low speed bearing testing machine

In 2013, the company invested more than 1.7 million yuan. The first company purchased the first high- and low-speed bearing simulation test machine in the same industry in China. It is controlled by computer and can apply continuous load for life test. It can also apply rectangular wave load for wire rolling. In the simulation test, the main technical indicators cover the rolling speed and rolling force requirements of the 5th and 6th finishing mills of Morgan. The heavy-duty high-speed and low-speed bearing testing machine of the finishing mill is tested by the load spectrum, the rotational speed requirement and the temperature working condition of the computer-controlled spindle bearing and the various working performances are evaluated. The test machine has the characteristics of high speed and heavy load. The test mechanism adopts a bridge structure, and each part of the assembly and disassembly parts adopts a split structure, and the mechanical design structure is simple, and the assembly and disassembly is convenient. The loading of the load adopts the stepping motor loading mode, and the spindle speed is selected from advanced technologies such as high-power motor and electric spindle. Faults can be automatically identified and stopped during the test.

Free combination pairing for angular contact ball bearings

Arbitrarily matched bearings are specially manufactured so that when arranged arbitrarily and mounted close together, a certain internal clearance or preload and/or uniform load distribution can be obtained without the use of spacers or the like. Any paired bearing with a model suffix indicates internal clearance (CA, CB, CC) or preload (GA, GB, GC). When ordering, you need to specify the number of individual bearings required, not the number of bearing sets. When the load capacity of a single-row bearing is insufficient, use a paired installation (series configuration); or when the load is a composite load or an axial load acting in both directions, use a paired installation (back-to-back and face-to-face pairing). The load lines are parallel when arranged in series, and the radial and axial loads are evenly shared by the bearings. However, the bearing set can only withstand axial loads acting in one direction. If the axial load acts in the opposite direction, or if there is a composite load, a third bearing that is adjusted relative to the series matched bearing must be added. The load lines of the back-to-back matched bearings are separated from the bearing shaft. It can withstand axial loads acting in both directions, but the load in each direction can only be absorbed by one bearing. Back-to-back mounted bearings provide a relatively rigid bearing configuration and can withstand overturning moments. The load lines of the face-to-face matched bearings converge toward the bearing shaft. It can withstand axial loads acting in both directions, but the load in each direction can only be absorbed by one bearing. This configuration is not as rigid as back-to-back pairing and is not well suited to withstand overturning moments. Universally matched bearings also have advantages when used in conjunction with a single bearing. Most bearings are SKF Explorer series, so they have higher precision, load capacity and higher speed.

Lubrication and sealing of high speed wire rod bearings

Whether the working performance of the rolling mill bearing can be effectively utilized depends to a large extent on the lubrication. The lubricant is called the “fifth largest component of the bearing”. More than 40% of the damage of the rolling mill bearing is caused by poor lubrication. Therefore, to reduce the bearing consumption of the rolling mill, it is necessary to select a lubrication method suitable for the conditions of use and a high-quality lubricant, and also to design and install a reliable anti-invasion of water and scale. Sealing means. At present, the rolling mill bearings mainly use grease lubrication and oil and gas lubrication. Most of the manufacturers now use simple and easy grease lubrication. If it is possible to adopt oil and gas lubrication technology, the rolling mill bearings can work under ideal lubrication conditions, which will greatly reduce bearing consumption. 1, grease lubrication The grease lubrication method has the characteristics of simple and easy operation, convenient roll replacement, and wide application. The appropriate grease should be selected according to the working temperature, rotation speed, rolling force, sealing waterproof performance, impact vibration size, and grease supply method of the rolling mill bearing. Greases of regular manufacturers with high temperature resistance, high viscosity, excellent extreme pressure performance and high water repellency resistance should be selected. According to the working characteristics of the rolling mill bearing, 2#, 3#, lithium base grease or polyurea containing EP additive should be selected. Although the high-performance grease purchase cost is high, the amount of use is small, the bearing life is long, and the total integrated cost is reduced. In addition, the filling amount of the grease must be in an appropriate amount and filled in place. The grease of different grades cannot be mixed, so that the working surface of the bearing of the rolling mill is always in the normal state of the oil film. 2, the amount of fat Fill the inner space of the bearing when filling the grease for the first time. For the vertical roller or the inclined roller, fill the upper and lower covers of each bearing seat with a sufficient amount of grease. After each roll change, check whether the grease is hardened and blackened, contaminated with impurities, and oxidized and emulsified. If the above situation occurs, the grease should be completely replaced and the seal and sealing structure should be replaced or improved in time; if the situation is still good, the new grease can be added and continue to be used. 3, oil and gas lubrication Oil and gas lubrication is the ideal lubrication method for bearings. During the working period, the compressed air enters the bearing with lubricating oil at intervals. The lubricating oil stays inside the bearing, and the air takes away the heat in the bearing operation while preventing external impurities. Water vapor invades the inside of the bearing. The oil is not atomized and does not pollute the environment. 4, sealing device The seal of the bearing is to maintain a good internal lubrication state, and prevent the cooling water, iron oxide scale and impurities from immersing into the working surface to prolong the service life of the bearing. Due to the bearing seal problem of the rolling mill, the most damage to the bearing is the part near the side of the roller. The bearing is often contaminated and lost due to grease, causing the working surface of the part to wear, peel off or even chip, especially the infiltration of the emulsion of the cold strip mill. Grease failure is faster. Bearing seals are divided into self-contained seals and external seals. The outer seal is mainly designed with a combination of labyrinth and contact. The more stages of the labyrinth (not less than the two poles), the smaller the gap, the better the sealing effect. The gap of the labyrinth is 0.6 to 1.5 mm on one side and 4 to 6 mm in the axial direction according to the size of the bearing. Contact skeleton oil seal: It is widely used in rolling mills, and can be used side by side in order to increase the effect. The oil seal is directional and cannot be reversed. The hot rolling mill is usually equipped with two oil seals, and the two oil seal lips must be directed outside the bearing housing to prevent external dirt from entering. The cold strip mill is generally equipped with three oil seals. The oil seal lip close to the bearing is to be inward to prevent the grease from overflowing and affecting the quality of the rolled material. Be careful when using the oil seal to avoid damaging the lip when loading the roller and affecting the sealing effect. RBR type seal ring: This is a rubber lip seal ring for rolling mill bearings, which has been widely used in recent years. The RBR sealing ring adopts the axial sealing method, and the lip is attached to the base surface of the gland, which is not affected by the roll beating. The old grease inside the bearing can overflow, and the external cooling water, iron oxide scale and impurities are blocked by the lip. Enter, have a good sealing effect. Moreover, it is convenient to use, and the roll is loaded into the bearing seat without any influence when the roll is changed.