In the application of full-roller bearings without an outer ring, the early damage is a common failure of full-roller bearings without an outer ring. There are also various forms of early damage to bearings, such as improper bearing cooperation, improper placement, and improper protection. The imagination of early damage, Xiaobian shared the following aspects without early damage caused by improper outer ring full roller bearings. 1. The damage caused by the different size, shape and position accuracy of the workpiece combined with the bearing. If the shoulder of the workpiece shaft and the housing hole is not perpendicular to the combined surface, or the roughness of the bearing positioning surface is inconsistent, and the shaft is bent, it will be damaged. This causes the axes of the inner and outer rings of the bearing to incline each other and causes a significant increase in the local contact stress on the rotating surfaces of the ferrule and the roller, resulting in fatigue and early damage. If the workpiece shell hole is oval or tapered, the ferrule will be deformed and the raceway will be damaged, thereby causing premature wear and fatigue damage of the raceway. Similarly, if the shape of the joint journal of the workpiece shaft and the bearing is not accurate, it will also cause damage to the raceway of the inner ring of the bearing. If the shaft diameter is too large, the inner ring may be broken; if the outer diameter of the outer ring is too large, the outer ring will become loose and slip, which will further aggravate the wear of the outer diameter of the outer ring and the outer ring. 2. The bearing is damaged due to improper placement and manipulation. The inner component and outer ring of the tapered roller bearing are placed on the shaft and in the outer shell respectively. When installing, due to inclination, impact or excessive force on the device, the raceway of the ring can be damaged. And the rollers are damaged, even if this damage is small, it will aggravate the damage of the raceway. If there is a bump on the roller, it will also cause damage to the raceway of the ring after the bearing rotates. During the installation process, if the press-fit method is used to carry out the bearing installation, a special sleeve object must be used, because simply hitting the ferrule with an iron rod may cause cracks or end face damage to the ferrule, and even cause the inner ring rib to crack. . In order to avoid the generation of cracks, it is not advisable to use an iron rod to simply knock the ferrule when placing it, but be sure to add a copper gasket. When using a special sleeve object for the installation of the inner assembly, attention should be paid to the inner and outer diameters of the sleeve to avoid the cage being deformed by pressing the sleeve on the end face of the cage. When the deformation is tight, the rollers may be scattered. If the components in the bearing are accidentally dropped or collided during handling and installation, the cage will be deformed, and the deformed cage will cause the rollers to be stuck, which will affect the rotation of the bearing and cause fever and burns. , Z will eventually cause the bearing to be invalid. After the bearing is installed, the adjustment of the clearance between the outer ring and the inner component is also very tight. If the clearance is too small, the temperature rise will be too high, accelerated wear and even seizure; if the clearance is too large, additional radial runout and axial runout will occur. The movement causes the relative displacement of the roller and the outer ring raceway and causes uneven local wear and noise. Only proper adjustment can ensure the normal operation of the bearing. 3. When the bearing is damaged due to improper protection, if the lubricating oil is not enough, the simple contact between the metal and the metal of the working surface will cause scratches, and cause fever and burns, reduce the original hardness of the bearing and cause adhesive wear, which will eventually cause Bearing is invalid. Before the bearing is placed, if the workpiece is not cleaned or the added lubricating oil is not clean (such as mixed with sand, dust, dirt, etc.), or due to unreliable sealing and working in a dusty environment, a few hard particles enter the bearing roller. This will cause abrasive wear, and fine groove marks or fine pitting will appear on the surface, which will increase the bearing clearance, reduce the accuracy, and shorten the service life. In the application, such as the benefit of excessive static load or impact load, it is likely to produce asymmetrical plastic deformation - indentation at the contact between the inner ring and the roller. The appearance of the indentation will increase the vibration and noise of the bearing, increase the temperature, and increase the wear and tear, which will cause tension spalling and make the bearing ineffective. This kind of environment is mostly produced on bearings with low rotation speed or oscillating. Bearings work in wet media and in environments with acid vapors and other substances that cause metal corrosion, such as poor sealing of bearings, which may cause rust. The mixing of rust products and lubricating oil can cause erosive wear on the running surfaces of raceways and rotating bodies, and stimulate surface spalling. In the application of the bearing, if current flows through the bearing, the current may break down the bearing oil film and generate electric sparks, which will cause the surface to melt and form small pits or strip pits. In order to make the bearing work normally and reach the expected life, when selecting the bearing, the necessary calculations should be carried out for the main invalid form of the bearing. For bearings in normal operation, the life should be calculated according to the contact fatigue and the rated dynamic load; for high-speed bearings, in addition to the life calculation, the required limit speed check should be carried out; for bearings with low speeds, static Strength calculation to prevent plastic deformation. After the bearing fails in the early stage, it is necessary to carefully investigate the damaged environment, analyze the cause, and take necessary improvements. else,The bearing combination layout design should be reasonable, to ensure sufficient lubrication and reliable sealing, which is very important to improve the life of the bearing and to ensure the longevity of normal operation.
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