When the timken bearing is working, the load on the rolling elements and the inner ring (or outer ring) is not constant, but changes over and over again with the running cycle of the cylindrical roller bearing. This kind of load is an alternating load; and because the contact area between the rolling element and the inner ring (or outer ring) is very small, the contact stress is very large. At a higher speed, the huge alternating contact stress acts repeatedly for many times. under, the metal will fatigue. At the beginning, tiny cracks are visible in the place where the stress is concentrated. Due to the action of lubricating oil and the corrosion of the metal, the cracks gradually expand. When the expansion reaches a certain level, the surface metal will peel off, forming small pits, similar to pitting, When we dismantle and inspect the bearing, we will often find that there are pits and pieces of metal peeling on the surface of the inner or outer ring and rolling elements, which is the phenomenon of metal fatigue spalling. If the fatigue spalling of the timken bearing occurs after the bearing runs for a long time, it should be regarded as natural damage. If it occurs in the middle or early stage of the bearing's use, it should be regarded as unnatural spalling. At this time, the cause of spalling should be identified. 1. Turn its outer ring and carefully rinse the junction of the cage, rolling elements and raceways, requiring that any hidden parts of the original oil traces be thoroughly cleaned. After the cylindrical roller bearing is cleaned, the attached cleaning oil should be drenched and dried on a workbench lined with clean neutral backing paper, or slowly dried in a far-infrared oven. After the cleaning oil has been drenched and even dried or dried, the bearing rings, cages or any rolling elements must not be rotated during the whole process. Timken bearings are to be removed from their oil seal packaging just before delivery for customary inspection and immersed in scrubbed gasoline or acid-free kerosene containing 3% motor oil. 2. Lubricating oil should be dripped in as required and immediately delivered for inspection, dried or dried bearings. At this time, the outer surface of the bearing is not protected by an oil film, and the skin of human hands should not be directly touched during the entire inspection process. The operator should wear clean gloves or apply rust inhibitor on his hands, but it must be avoided that the rust inhibitor on the hands is mixed with the rolling of the bearing. appearance, otherwise the measurement results will be biased. 3. It should be delivered for use immediately or treated with anti-rust inventory, and the entire inspection process should be completed as soon as possible, after the bearing is inspected. So as not to cause rust over time. Note that cleaning with pure gasoline without oil can also cause rust. 4. Cylindrical roller bearings that have been dried or dried should be dripped with lubricating oil as required and delivered for inspection immediately. At this time, the outer surface of the timken bearing is not protected by an oil film, and should not directly touch the skin of human hands during the entire inspection process. Operators should wear Put on clean gloves, or apply rust inhibitor on your hands, but you must prevent the rust inhibitor on your hands from mixing with the rolling surface of the bearing, otherwise the measurement results will be biased. 5. After the bearing is inspected, it should be immediately delivered for use or treated in anti-rust inventory, and the entire inspection process should be completed as soon as possible to avoid rusting caused by too long. Note that cleaning with pure gasoline without oil can also cause rust. 6. Before the bearing is inspected, it must be placed on a metal plate in the inspection site together with the gauge blocks, standard parts and measuring instruments used for the inspection, so that the temperature of these objects can be uniformized and room temperature quickly. According to the causes of cylindrical roller bearing damage, careful analysis can be well prevented. 1. Bearings should be kept properly. Bearings should not be exposed to rain and moisture to avoid rusting. Bumps are strictly prohibited. 2. The bearing type, configuration and accuracy should be reasonably selected according to the size, direction and nature of the load. 3. According to the use of bearings in machinery and equipment, reasonably select the matching properties and tolerance grades of bearings and bearing seats, bearings and shafts. 4. Avoid current passing through the bearing to prevent electrical corrosion. 5. For important precision bearings, there should be a good environment in use to prevent the vibration of the bearing from being corroded by the strong vibration of the nearby punching machine. 6. The bearing with residual magnetism should be demagnetized to prevent the adsorption of metal chips. 7. Avoid heating caused by friction caused by the relative sliding between the inner and outer rings of the bearing and other contact parts. 8. Do the preparatory work before assembly. (1) According to the type, structure, size and matching properties of timken bearings, select appropriate assembly methods and tools. (2) Check the processing quality of the assembly surface of the bearing assembly, including dimensional tolerances, geometric tolerances and surface roughness. If there are rust, surface bumps and other defects, it should be carefully removed. (3) It is not allowed to use the bearing equivalent gauge to measure the accuracy of the journal or bearing seat hole. It is also forbidden to chamfer, grind grooves, etc. on the bearing, which will not only easily deform the bearing, but also easily enter the bearing and damage the bearing. (4) The new cylindrical roller bearing must be carefully cleaned before assembly. The cleaned bearing should not be placed directly on the platform. It should be placed under the timken bearing with a clean cloth. rust.
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