Designed to withstand heavy loads and to extend the service life of machinery by reducing friction and distributing forces, bearings are very inclined to shocks and heavy impacts. Due to this fact, improper dealing with or incorrect mounting and dismounting can damage the weather of a bearing, causing extreme noise and vibration levels, and affecting the bearing rotation.
The identical can happen when small particles enter the bearing, inflicting the contamination of parts or of the lubricating substance. Even very small foreign particles can contaminate the bearing, jeopardizing the service lifetime of the device. These types of bearing damage will be prevented by dealing with the gadgets properly and using the fitting tools when mounting and dismounting bearings.
ERIKS provides a complete range of bearing instruments intended to keep bearings well maintained throughout use, and to ensure the safe mounting and dismounting of bearings.
Bearings mounting process
INSPECT ALL COMPONENTS FOR CONTAMINATION AND DAMAGE
Earlier than mounting the bearings, make certain they’re still within the unique packages, to stop contamination. Evaluation the drawings to find out the correct orientation of the bearings within the assembly, and once you have everything ready, unpack the bearings and inspect them before mounting. If the bearings have been opened before and there’s a risk of contamination or damage, wash and dry them earlier than mounting.
Check the realm of the machine the place the bearings will be mounted: this additionally must be clean, dry and dirt-free. If you want to install housings, shafts or seals, make positive they’re clean and mud-free. Check the lubrication holes and threaded holes for traces of substances from earlier ensembles.
NOTE: New bearings could also be covered in preservative. In most cases, it’s not necessary to scrub this off, so long as you wipe off the outside and bore surfaces. However, it is important to double check if the lubricant you plan to make use of is appropriate with the preservative. If not, you could wash and dry the bearing earlier than mounting it. This doesn’t apply to bearings with seals and shields.
When all this is completed, you possibly can go to the second step of the process.
CHECK THE TOLERANCES OF ALL ELEMENTS IN THE ASSEMBLY
The dimensional and geometrical tolerances of the items in the assembly must be checked before starting the mounting, because the performance of bearings might be severely affected by poorly chosen associated components. The tolerances of bearings are described by tolerance lessons, as defined in the ISO 492 (radial bearings) and ISO 199 (thrust bearings) standards. These lessons are important as they affect the applications of bearings.
As you could know, a bearing’s tolerance refers to three aspects of accuracy: the external dimensional accuracy, the machining accuracy and the running accuracy. The dimensional accuracy offers the bearing’s external dimensions, equivalent to bore diameter, outer diameter, inside ring width and outer ring width. This parameter is essential for figuring out the shaft and housing fits in a bearing assembly.
The machining accuracy offers the precision of the manufacturing process and is vital when selecting tolerances for shafts and housings. This parameter measures the variation in dimensions when comparing one bearing to another, for instance inner and outer ring width variations.
The running accuracy or runout measures the radial runout and axial runout for the inner and outer ring, the side runout for the interior ring and the outer diameter runout for the outer ring. This parameter is important for minimizing vibration and misalignment in an assembly.
NOTE: For applications that require moderate rotation and operational speed, bearings with a Regular tolerance class are a very good choice. Nevertheless, for applications the place more precision is needed, it’s best to choose a bearing with a more accurate tolerance class. A tolerance Class 6 means less precision than a tolerance Class four, and a Regular tolerance class is less precise than a Class 6. The tolerance class of the bearing must be chosen based mostly on the application requirements for the beforehand mentioned parameters.
Since good bearing performance depends upon adherence to the fits for the rings, the choice of the fits must be completed before mounting the bearing. The rings ought to be well supported within the assembly, but not too tight, as depending on the application, the inner clearance of the bearing will change. Thus, the clearance ought to be adapted to the fits. This implies that besides checking the tolerances, you must also make positive the bearing has the proper clearance and that the fits aren’t too loose or too tight.
If you liked this article and you would like to collect more info concerning ตัวแทน skf ประเทศไทย generously visit our web site.