SKF universal joint bearing some problems using inspection work

SKF bearing in the work, because of the influence of the external or internal factors, change the original fit clearance, lower accuracy, and the change of 'killed' called clearance failure. , large amount of the external factors such as interference of installation does not reach the designated position, temperature rise caused by the expansion, instantaneous overload, etc. , internal factors such as residual austenite and the residual stress in a state of flux and so on all is the main reason for the failure caused by clearance changes. Rotate the outer ring and flush the cage carefully, the rolling element and raceway border, the need to thoroughly clean the oil residue any part of it that was previously hidden. The bearing should be attached to rinse friendly dry cleaning, dry clean lined with neutral table support, or in the far infrared drying oven is slow. If the dry cleaning friendly dry or drying, the process should not take SKF bearing ring, adhere to any frame or roller. Universal joint bearing oil delivery before testing in practice can remove oil seal, and immersed in kerosene or gasoline cleaning without acid 3%. Should be required to check into lubricating oil and instant delivery, is dry or dry bearings. At this time no oil film, so as to protect the exterior surface of SKF bearing, the inspectors do not allow direct contact with the skin of the process, the operator should wear clean gloves, hand painted with rust, but must be avoided in the hands of the appearance of the corrosion inhibitor mixed rolling bearing, or be the deviation of measurement results. Shall be immediately delivered or rust stock process, the entire inspection process should be completed, check the bearing. Time is too long, lest cause corrosion. Pay attention to the pure gasoline use clean oil, also can cause corrosion. Bearing is dry, or dry, shall be in accordance with the provisions, check without the outer surface of the bearing oil film protection drip into the lubricating oil and instant delivery, at this point, the entire process of inspection, does not allow direct contact with human skin, the operator should wear clean gloves, hand painted with rust, but must be avoided in the hands of a rust inhibitor mixed gimbal bearings rolling surface, otherwise it will be the deviation of measurement results. Bearing inspection is immediately after the completion of delivery or rust counting process, seize the completion of the inspection process should be as far as possible don't last long due to corrosion. Pay attention to the pure gasoline use clean oil, also can cause corrosion. Grinding quality of SKF bearing premature failure can decide from the above test results, the influence of the grinding crack on one side of the raceway grinding burn is ring and split, a direct cause of the premature bearing failure, a crack in this example reveals macro morphology and distribution feature of grinding burn, the original position of raceway partial or race R not round, make on one side of the raceway grinding allowance increases, when the coarse grinding phase feeding, grinding speed, the whole race is uneven grinding. If the grinding wheel dressing, not in time to chip embedded or sticky pore blockage caused by grinding wheel and passivation, thus will cause increased grinding wheel unbalance, spindle vibration, even machine tool vibration and grinding chatter. Grinding force is obviously cyclical change, form discontinuity burns a stripe. In order to further understand the ring hardness distribution and microstructure quenching tempering and the microstructure characteristics of the surface layer, choose some split inner ring and its pieces, in the face and upper macro hardness, and the cutting method in split near interception longitudinal metallographic specimen.