Installation and use common problems of rolling bearing

1, assembly imposed by external forces, don't by bearing roller or ball passing, in order to avoid damage to the bearings. 2, give priority to choose the impact way of loading and unloading. 3, need to knock, to correct. 4, for the precision requirement of bearings, such as spindle bearing, and often pre-tightening force requirements. Because these bearings only under the reasonable pre-tightening force, to achieve the accuracy of nominal. Such as lathe spindle, generally before and after two is centripetal thrust roller bearings. After assembly, need by each end of the nut and tighten, to meet the requirements of main shaft runout. General is bearing factory to provide the parameters of the prestressing force. But in the actual process of assembly, not well measured is in line with the requirements, the prestressing force traditionally tend to be the assembly workers installed by experience. Some structure, can adopt the method of measuring preloaded deformation in advance. For example, a centripetal thrust bearing, the pre-tightening force of 20 kg. We can put the bearing outer ring, stand on the platform, then places 20 kg force on the inner ring. Difference in height between the inner and outer ring variation before and after applying pressure measurement, usually by leverage dial indicator can be detectable. After deformation, in the preloaded structure design a gaskets, gasket was the height difference of preloaded variation before and after. So, to guarantee the nut tight after the death of preloaded quantity remains the same. Change in the past by workers had the assembly method of integral bearing assembly 5, if the bearing with iron filings, burr, dust and other foreign matter to enter, will make the bearing noise and vibration during operation, even damage raceway and rolling body. So, before the installation of bearings, you must ensure that the installation surface and the environment clean. 6, bearing must be cleaned before installed a bearing surface coated with anti-rust oil, you must clean with clean petrol or kerosene carefully, then coated with clean, high quality or high speed high temperature lubricating grease before installation. Cleanliness of bearing life and the influence of vibration noise is very big. But we especially want to remind you is: fully enclosed bearing not clean fuel. 7, how to select grease lubrication of the bearing work and life have very important influence. Here a brief introduction to select the general principles of the grease to you. Grease made out of base oil, thickener and additive, different types and different type of same kind grease properties vary widely, allowing the rotation of the limit, when the choice is important to note. The performance of the grease is mainly determined by the base oil. The basis of generally low viscosity oil is suitable for low temperature, high speed; High viscosity is suitable for high temperature, high load. Thickener and relationship with lubrication performance, thickening agent, water resistance to the water resistance of the grease. In principle, different brand of grease can't mix, and even the same thickening agent of grease, will also bring bad influence each other on the basis of different additives. When lubricated bearing, oil paint, the better the more you lubricated bearing, oil paint, the more the better, this is a common mistake. Bearing and bearing indoor excessive grease will cause excessive oil mixing, resulting in a high temperature. 8, how to install and remove the installation not hammer bearing end face and the bearing surface directly, should with press, sleeve or other installation tools for uniform bearing force. If the installation surface coated with lubricating oil, will make the installation more smoothly. If the interference fit is larger, should put the bearing into the heated to 90 - in mineral oil - 100 ℃ immediately after installation. When removing difficulties, it is recommended that you use disassembly tool to pull at the same time to careful labor the inner ring of hot oil, heat can make the bearing inner ring expansion, making it easier to fall off. 9, bearing radial clearance as small as possible? Work not, all require the smallest bearing clearance, you must choose appropriate clearance according to conditions. GB4604-93, the rolling bearing radial clearance is divided into five groups - 2, 0, 3, 4, 5 groups, clearance values in sequence from small to large, including standard clearance for 0 group. Basic radial clearance group applicable to the general operation conditions, the conventional temperature and the range of the commonly used; In the high temperature, high speed, low noise, low friction bearing special conditions such as work, appropriate chooses big radial clearance; For precision spindle, spindle bearing, and other appropriate chooses smaller radial clearance; For roller bearing clearance can keep a small amount of work. In addition, the separation type of bearing is not clearance; In the end, the bearing capacity after work clearance, than the original clearance before the installation is small, because bearings will absorb a certain amount of load, and bearing fit and load produced by the elastic deformation. Adjustment of rolling bearing clearance and preload process, is to improve the bearing capacity, bearing rotating accuracy and is the effective means to reduce vibration and noise transmission system. Assembly work should make clear in concept and technical requirement of the bearing assembly, as well as bearing temperature control and keep good lubrication, this process method to use correctly, can guarantee the quality of rolling bearing assembly. In this paper, source of Chinese bearing http://www. zcwz。 Com reprint please indicate