- Hello Customer - Log in or Register!
Main factors influencing the grinding degenerating layer of SKF bearings have two aspects, namely the effect of bearing grinding force and grinding heat.
1, grinding force
In the grinding process, the workpiece surface layer will be grinding wheel cutting force, the role of compression and friction. Especially for the latter role, the workpiece surface layer formed directional strong plastic deformation and hardening layers. The metamorphic layer necessarily affects the change of residual stress in surface layer.
(1) cold plastic deformation of layers
In the grinding process, every moment of wear particle is equivalent to a cutting edge. However, in many cases, before the cutting edge angle is negative, except for cutting role of wear particles, is to make the surface subjected to compression (plough), clear plastic deformation of workpiece surface layer. This deformation degree of deformation layer with the degree of grinding blunt grinding feed and grow larger.
(2) hot plastic deformation (or high-temperature deformation)
Grinding heat work surface to form the instantaneous temperature, makes a certain depth of sharp decline in surface layer of elastic limit, or even the extent of the loss of elasticity. Work surface layer on grinding force at this time, especially under the effect of compression and friction, cause freedom stretch, subject to limitations as base metal, the surface is compressed (plow), in surface layer caused by plastic deformation. High temperature plastic deformation in grinding process of the same cases, increased with the rise in surface temperature.
(3) work-hardening layer
Sometimes micro-hardness and metallographic law can be found, due to deformation of the surface layer hardness up.
2, grinding heat
In grinding, grinding wheel and workpiece contact zone, consume large amounts of energy, produce a lot of grinding heat, causing local instantaneous temperature of grinding zone. Applying the theory of linear motion-heat-source heat transfer formula, calculate, or application of infrared measurement and thermocouple method under experimental conditions the instantaneous temperature, can be found at 0.1~0.001ms in grinding zone of instantaneous temperature can be as high as 1000~1500℃. Such a transient high temperature enough to make the certain depth temperature on the surface layer of oxide on the surface, non-crystalline, high-temperature tempering, quenching for the second time, or even burn crack a variety of changes.
Selection of propriety remained SKF bearing failure analysis of factors that must be taken into account. Main tasks of bearing failure analysis, is based on the large amount of background material, analysis of data and failure mode, identify the main factors causing bearing failure, so targeted for improvement measures, extending the service period of bearing, avoid unexpected early bearing failure. Installation conditions is one of the leading factors in the use factor, bearing package is often caused by installing is not the right state of change between the various parts of the bearing, bearing under abnormal operation and early failure. Depending on the bearing of the installation, use, maintenance, maintenance technical requirements, SKF bearings in the running to take the load, speed, temperature, vibration, noise monitoring and checks and lubrication conditions, abnormal findings immediately find the cause to adjust, bring it back to normal.
SKF bearings are superior even go form announced low low high pitched whining noise noise percussion injuries can also occur, this noise will follow the thin-walled bearing speed bump and the differences.
If intermittent noise, then. Announced sharp hiss hiss sound, sound of squeaking sounds and unruly, often reveal performance continuous transfer of the bearing is in a bad situation.
For heavy load should be selected penetration small when working at high pressure lubricating grease in addition to penetration of small things, also have a high oil film strength and extreme pressure properties. When selecting a grease based on environmental conditions, calcium base grease easily soluble in water, less suitable for drying and moisture environment.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| NJ2220ET NSK | 100 | 100 | 46 |
| NJ2219ET NSK | 95 | 95 | 43 |