timken bearing work, the rolling element and inner (or outer) suffered the load is not constant, but with cylindrical roller bearings operating cycle changing. This load is alternating load; and because the rolling element and inner (or outer) of the contact area is small, making a great contact stress at high speed, in great repeatedly alternating the role of the contact stress , the metal will fatigue. Began, resulting in stress concentration area can be seen small cracks, due to the role of oil and metal corrosion, the cracks gradually expanded, when extended to a certain extent, there will be peeling off the metal surface, forming small print pit, similar to pitting, in dismantling the bearing, it will often find that within the outer ring and rolling elements or surface pitting, and a block of metal falling off, this is the phenomenon of metal fatigue spalling. timken bearing if the bearing fatigue spalling occurred after long-term operation, should be regarded as natural damage, if used in the mid or early bearing occurs, should be regarded as unnatural peeling, then, should identify the reasons for peeling.
1. Rotating the outer ring and carefully wash the cage, rolling elements and raceways at the junction, require any previously hidden parts of the residual traces of oil thoroughly cleansed. Cylindrical roller bearings shall be attached after the wash clean and dry cleaning Youlin, lined with clean neutral liner on the bench to dry, or slowly in the far-infrared drying oven. Since even dry cleaning Youlin dry or drying, the whole process of rotating bearing ring may not adhere to any aircraft or rolling elements. timken bearings in practice to be delivered before the test can remove the oil seal packing, and oil immersion washing with 3% acid-free kerosene or gasoline.
2. Instillation of oil should be required to be delivered immediately check the bearings have been dried or dried. At this time no oil film to protect the outer surface of the bearing, the whole inspection process staff are not allowed to directly touch the skin, the operator should wear clean gloves, or hand painted with rust, but rust inhibitor must be avoided in the hands of the rolling bearing mixed appearance, otherwise it would be measured deviations occur.
3. Should be delivered immediately or rust inventory process, the entire inspection process should be to accomplish, after checking the bearings. Took too long so as not to cause corrosion. Note the use of pure gasoline without oil washing can also cause corrosion.
4. Has dried or dried cylindrical roller bearings, oil drops and should be required to check for immediate delivery, this time timken bearing outer surface of the film without the protection of the entire inspection process staff are not allowed to directly touch the skin, the operator should wear on clean gloves, or hand painted with anti-rust agents, but must be avoided in the hands of anti-rust agent mixed with the rolling bearing surface, otherwise it would be measured deviations occur.
5 Bearing in check has been completed, should be delivered immediately or rust inventory process, the entire inspection process should be to accomplish, so as not to last too long cause corrosion. Note the use of pure gasoline without oil washing can also cause corrosion.
6 bearing before the inspection and inspection is also used by some to be the amount of blocks, standard parts and measuring instruments co-located on the premises of a metal inspection plate, so that these objects can be quickly temperature and room temperature of homogenization.
Cylindrical roller bearings according to the causes of injury, a careful analysis, to be put to good prevention.
1, the bearings should be properly safeguarded, bearing not to rain and moisture, in order to avoid corrosion is strictly prohibited bump injuries.
2, the load should be based on the size, direction and nature of rational choice bearing type, configuration, and precision.
3, according to the bearings on the use of machinery and equipment, a reasonable selection of bearings and bearing, the bearing and shaft with the nature and tolerance level.
4, to avoid the current through the bearing on to prevent galvanic corrosion.
5, for the important use of precision bearings should be in a better environment, to prevent strong vibrations near the punch of the vibration of the bearing corrosion.
6, the bearing of a residual magnetic demagnetization should be to prevent the adsorption of metal debris.
7, to avoid contact with the bearing inner and outer rings and other components caused by the relative sliding friction caused by the heat.
8, do the preparatory work before assembly.
(1) According to the timken bearing type, structure, size, and with the nature, select the appropriate assembly methods and tools.
(2) Check the bearing assembly mounting surfaces of the processing quality, including dimensional tolerances, geometric tolerances and surface roughness. If rust, bumps and other surface defects should carefully removed.
(3) does not allow the bearing to measure journal or equivalent regulations bearing bore accuracy. More may not bearing on the chamfer, groove grinding, etc., so not only easy to make the bearing deformation, but also easy access to chip bearing convinces bearing damage.
(4) The new cylindrical roller bearings must be carefully cleaned before assembly, after cleaning the bearings can not be directly on the platform, use a clean cloth pad below the timken bearings, not bare hand pick, hand to prevent the bearing health rust.