Analysis of NSK bearing installation considerations

NSK bearings for proper installation, directly affecting the service life of bearing used in precision, and performance. ( 1) Cleaning of NSK bearings, with temperature is 90 ~ 100 ℃ heat oil pour hot to melt encapsulated oil, at the same time with seamless all mouth and no net exfoliation tools to dig the old oil, then pour hot a few minutes, then rinse with kerosene oil, clean with gasoline last again. After washing clean, the NSK bearings on film gloves should be worn in to the worktable of dry clean cloth or paper. ( 2) NSK bearings in prior to installation, should use the appropriate measuring tools according to the provisions of the technical requirements on the design drawing check the shaft and hole and machining quality of parts ( Such as dimensional accuracy and shape accuracy and surface roughness, etc. ) 。 ( 3) NSK bearings installed in the open the package and put it into the liquids such as gasoline with handle gently gently turning, to ensure the cage, encapsulated oil on the surface of the rolling element and raceway thoroughly washed clean. ( 4) Should be assembled with clean the surface of the gasoline, kerosene, toluene and xylene solution washing clean, with dry clean duster cloth, and then coated with a thin layer of lubricating oil, it can make the operation more convenient installation. ( 5) Note with NSK bearing seal do not clean with this law, the seal of the internal cleaning should remain the same. ( 6) Shaft and the bearing hole assembly there such as bruising, burr, rust stain on the surface or solid particles ( Such as abrasive dust, sand, clay) NSK bearings such as existence, not only can make the installation difficulties and make the installation position is not correct, and solid particles such as NSK bearings will fall into the grinding effect, when NSK bearing rotating grinding NSK bearings or bruising of the surface of the work, so must be carefully checked before the installation, if found to have the above defects, should be revised. For example using oil file to remove burrs, bump touch mark, rusty spot, with fine abrasive cloth lighting, and like a clean solid particles, dirt, etc. ___________ installed using copper bar and manual 'strike it is small and medium-sized NSK bearing an easy way. When the bearing inner ring is tight fit, a loose fit for outer ring, the copper rod bearing inner ring end face and directly with hammer percussion tongbang, through tongbang force, will slowly loaded on the shaft of the bearing. Bearing inner ring is larger, can use copper bar around the bearing inner ring end face even hitting, avoid by all means just knocking on one side, also can't overexert, symmetrical knock, knock on slowly, gently to avoid inclined crack bearing. 2. Using this method and use of copper rod sleeve installation NSK bearing point is the same. It is a direct pressure on the bearing face the sleeve ( When the bearing is installed on the shaft pin inner ring end face; In a shell hole pressure within the outer end face) , hammer percussion force can be evenly distributed in the installation of the bearings on the ring width, and can be used together with the press, easy installation time and reliable in quality. Install the sleeve should be used in the soft metal manufacturing ( Copper or low carbon steel tube) 。 If the bearing installed on the shaft, sleeve inside diameter should be slightly bigger than the journal 1 - 4 mm, outside diameter is slightly less than the bearing inner ring rim diameter, or will be subject to the thickness of the sleeve, its thickness should be equal to the thickness of bearing inner ring made two-thirds - 4/5, and the sleeve ends should be flat and vertical tube body. When installing hole here if bearing, the sleeve diameter should be slightly smaller than bearing outside diameter. 3. There is a press into law: install pressure should be directly applied to NSK bearing ring width of interference fit, otherwise it can be crushed on bearing working surface, lead to bearing damage quickly. 4. The installed heating for interference quantity larger bearing NSK bearings or big size, to facilitate the installation, use principle of heat bilges cold shrink, heat the bearing in the tank with copper bar, the sleeve, and hammer after installation. General control heating temperature under 100 ℃, 80 - 90 ℃ is more appropriate. When the temperature is too high, easy to cause bearing ring raceway and rolling body annealing, hardness and wear resistance, decrease in bearing life and scrapped prematurely.