Conventional cylindrical roller bearing damage and prevent inspection preparation work

Timken bearings, roller and inner circle ( Or outer ring) Of load is not constant, but with the change of cylindrical roller bearing operation again. The load for the alternating load; And because of roller and inner circle ( Or outer ring) Contact area is small, makes the contact stress is very big, under the high speed, in great alternating contact stress under the action of repeated many times, metal fatigue will occur. , visible tiny cracks in the area of stress concentration, due to the effect of lubricating oil and the corrosion of the metal, make the crack expanding gradually, when expanded to a certain degree, the surface metal flake will produce, form small pit, similar pitting, we in overhauling bearing, often found in or outer ring and roller surface pitting and flake pieces of metal, this is the phenomenon of metal fatigue spalling. Timken bearing fatigue spalling if the bearing occurs after long time operation, shall be deemed to be the natural damage, if, at the early stage of the bearing the use of the medium-term or shall be deemed to be the natural flake, then, should find out the reason of spalling. Rotate the outer ring and bracket will be washed thoroughly, rolling element and the raceway border, the requirement to any hidden part of residual oil stains thoroughly clean off. Cylindrical roller bearing should be attached to clean after washing clean oil spray dry, in line with clean neutral lining paper work table to dry, or dry slowly in the far infrared drying oven. Since oil spray dry clean and dry or drying, the process can not rotate or any rolling element bearing ring, adhere to the frame. Timken bearings in the delivery practices before inspection to remove the oil seal packing, and turn it into oil containing 3% no acid washing gasoline or kerosene. Should be in accordance with the provisions, drip into the lubricating oil and check for immediate delivery, is dry or drying of the bearing. At this time no oil film bearing outer surface protection, the entire process of inspection shall not directly touch the skin of hands, the operator should wear clean gloves, or hand coated with anti-rust agent, but the rust inhibitor must avoid hand bearing with rolling appearance, otherwise it will result in deviation of measurement results. Should be used for immediate delivery or rust inventory processing, also should take to complete the entire inspection process, bearing after the completion of the inspection. In order to avoid lasted too long lead to rust. Pay attention to the use of pure gasoline cleaning without oil can also cause corrosion. Already dry or drying of cylindrical roller bearing, should be in accordance with the provisions, drip into the lubricating oil and check for immediate delivery, timken bearing outer surface at this time no oil film protection, in the whole process of inspection shall not directly touch the skin of hands, the operator should wear clean gloves, or hand coated with anti-rust agent, but the rust inhibitor must avoid hand bearing with rolling surface, otherwise it will result in deviation of measurement results. 5. Bearing in the check has been completed, should be used for immediate delivery or rust inventory processing, also should take to complete the entire inspection process, so as to avoid took too long to cause corrosion. Pay attention to the use of pure gasoline cleaning without oil can also cause corrosion. 6. Bearing before the check has exiguity and check gauge block, standard parts, and measuring instruments used in the common place in the examination place a piece of metal plate, which can quickly make these objects of homogenization temperature and room temperature. According to the reasons of the cylindrical roller bearing damage, careful analysis, can well to prevent them. 1, the bearing should be properly kept, bearing don't rain and moisture, in order to avoid corrosion, it is strictly prohibited to knock against injury, etc. 2, should according to the size of the load, direction and nature of reasonable choices such as bearing type, configuration, and its accuracy. 3, according to the bearings used in machinery and equipment, reasonable selection of bearing and bearing seat, bearing and shaft with the nature and tolerance grade. 4, avoid current through bearings, in case of electrical erosion. 5, for important precision bearing in use there should be a better environment, prevent near punch, etc. , the vibration of the strong vibration on bearing. 6, with the residual magnetic bearings should be demagnetization, prevent the adsorption of metal chips. 7, avoid bearing inner and outer ring, and other exposed parts of relative sliding friction caused by the heat. 8, the preparation work before assembly. ( 1) According to the timken bearing type, structure, size and cooperate with the nature, select the appropriate assembly methods and tools. ( 2) Check on the surface of the bearing assembly assembly processing quality, including the size tolerance, form tolerance and surface roughness, etc. If there is any rust, surface defects such as bruised carefully removed. ( 3) Don't allow the bearings when the gauge to measure the accuracy of journal or bearing hole. Nor chamfering, grinding groove on the bearing and so on, this not only makes the bearing deformation, but also easy to chip into the bearing to bearing damage. ( 4) New cylindrical roller bearing must be carefully cleaned before assembly, after cleaning the bearing cannot be directly on the platform, with a clean cloth pad under the timken bearings, also can't bare hands to pick up, in case of hand rust bearing.