Prepare 1, NSK bearings
Due to the bearing anti-rust treated and packed, so no new year do not open the package before installing.
In addition, the coating rust preventive oil on the bearings have good lubricating properties, bearings or bearings of filling grease for general purposes, can be used directly without cleaning. But for instrument bearings or bearings for high-speed rotation, clean cleaning oil antirust oil wash away when bearings are easy to rust, cannot be placed for a long time.
2, axis and the shell testing
Clean the bearing with the shell, confirmed Burr without leaving scars or mechanical processing. Shell must not be abrasive (such as SiC, Al2O3) sand, chips, etc.
Second test axis and the shell's size, shape and process quality is consistent with the drawings.
　　Installation method of NSK bearings, bearing, conditions, structure may be, in General, due to rotate, so the interference fit is required for the inner rings. Bearings with a cylindrical bore and more with presses onto, or multiple-use and charging methods. Tapered bore, mounted directly on tapered shaft or sleeve installation.
　　When you install into the shell, General clearance, there is interference in the outer ring, normally, the pressure into pressure, or have installed after the cooling methods of shrink fit. Using dry ice as a cooling agent, shrink fit occasion, moisture in the air will condense on the bearing surface. So, you need appropriate antirust measures.
　　NSK bearings are installed correctly, affecting life, accuracy and performance. Therefore the design and Assembly departments for bearing installation the full study. Want to be installed in accordance with operational standards. Job standards projects often are as follows:
　　1, associated cleaning bearings and bearing components
　　2, check the size and finishing of bearings associated parts
　　3, the installation of bearings
　　4, bearing after installation check
5, bearing supplies lubricants
, The installation method
　　NSK bearing should be installed according to the bearing structure, the size depends on the size and nature of bearing parts fit, pressure should be added directly in the tight fit have rings on the face, shall not pass through the rolling pressure bearing installation generally uses the following methods:
Thrust bearing installation
　　Complete thrust bearings and shaft in General for transition fit, washer and bearing hole in General for a clearance fit, so the bearings is easy to install, bi-directional thrust bearing axis should be fixed on the axis to prevent relative to the axis. Installation method of the bearing, axial rotation is the case under most normal circumstances, so the inner ring and shaft meet to win tie, the bearing outer ring and bearing room fit for a clearance fit.
Press fit
Bearing within ring and axis makes tight tie, outer ring and bearing block hole is more pine tie Shi, available pressure machine will bearing first pressure loaded in axis Shang, then will axis together with bearing together loaded into bearing block hole within, pressure loaded Shi in bearing within ring end surface Shang, pad a soft metal do of Assembly casing (copper or soft steel), Assembly casing of diameter should than axis neck diameter slightly large, od diameter should than bearing within ring retaining edge slightly small, so as not to pressure in maintained frame Shang.
Second, clean the bearings and spare parts
　　NSK bearings and double-sided to have grease lubrication with seals or shields, seals without cleaning before the bearings are mounted. Check the size and finishing of related parts.
1, grease lubrication
　　NSK bearing's lubrication is best in equipment downtime during the implementation of the plan and supplement on a regular basis, at the same time, the older fat removed through oil spills or empty the old grease out. Join the fresh oil injection inlet should be clean before. If housing does not have injection inlet, you should open the housing lid or cover, in order to remove the old grease, after cleanup, add fresh oils of the same model.
　　2, are lubricated by lubricating oil
　　Periodically check the oil level and oil lubricants, under normal circumstances, normal oil level oil level window for the device, or marking should be within the range of 1/3-2/3. Fill the cup of oil for oil, oil level whose display only representatives of oil capacity, housing the oil level is to meet operational requirements, oil cup oil level lower than the total volume of one-fourth oil supplement may be considered.
　　Check and fill oil method, remove a small amount of lubricant as samples and compared to the fresh oil, oil investigations units can be taken into account in a position to ensure that oil qualified. If the sample looks like cloud, then the results may be mixed with water, that is, we often say that the oil emulsion, you should replace the lubricant.
　　If sample thread darken color or thick, it may indicate that the oil has begun to carbide should be completely replaced the old lubricant. If possible, use fresh lubricant to rinse the oil. When you replace the lubricant, should be ensuring that replacement of the lubricant of new, same as the older model, and added it to meet the requirements of the oil level.
　　Using an oil bath lubrication system, if the oil temperature of 60 ° c (140 ° f), and no contamination of lubricating oil, you can replace the lubricant a year. If the oil temperature of 60-100 ° c (140-210 ° f), the lubricating oil needs to be replaced four times a year. If the oil temperature of 100-120 ° c (210-250 ° f), it needs to be replaced once a month with oil. If the oil temperature of 120 ° c (250 ° f) above, needs to be replaced once a week with oil.
　　Proper installation and maintenance are important factors of NSK bearings run correctly, at the same time, care must be taken to maintain cleanliness of the bearing. Bearings must be contaminated by pollutants and moisture prevention, must be properly installed and lubricated. In addition, the column design bearings, oil seals, lubricants and replacement cycle and in the form of specialized care also plays an important role, they must be concerned.

 


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