Date: 2013-08-20

Injury of deep groove ball bearings simple correction technique

Clearance refers to one of the bearing rings under fixed, another along the radial or axial rings made by the maximum amount of activity, so clearance is divided into radial clearance and axial clearance of two. When assembling deep groove ball bearing, clearance must not be too large, or too small. Clearance is too large will result in reduction of rolling while loading, single rolling load increases, thereby reducing the NSK bearing rotation precision, reduced service life clearance is too small, will increase friction and heat generated increases, increased wear, can also reduce the service life of the bearing. Therefore, bearing in the Assembly would have to be strictly controlled and adjusted clearance.
Preload is the NSK bearings at the time of Assembly, to the inner or outer rings of an axial force to eliminate the bearing clearance and rolling deformation of early contact with the inner and outer rings. Bearing preload can increase running accuracy and stiffness in a working state, loading large bearings with high running accuracy requirements, largely in the absence of even a small amount of clearance work interference, this case requires the Assembly of deep groove ball bearings when tightening. Adjustment of clearance and preload is usually through an appropriate inner ring external ring for axial displacement method to complete. Technology concept is not hard to see from above, through the adjustment of clearance of rolling bearings, can improve the loading capacity and running accuracy of bearing, increase bearing service life. But will exacerbate bearing friction, heat increases, so adjust the clearance or preload must ensure good lubrication and heat dissipation. If improper adjustment or poor lubrication,, which in turn will exacerbate deep groove ball bearing wear, reduced service life. Proper adjustment of the bearing clearance and preload, also pay attention to the following issues.
Speed and temperature:
With the development of science and technology, machine tool spindle speed high speed increasing the scope, therefore, requirements for NSK bearing stability of high-speed operation is getting higher and higher. Deep groove ball bearing temperature rise limit bearing speed is an important factor. Typically, proper selection of non-standard bearing type, the tolerance class, how it is configured, clearance (preload), lubricant and lubrication method, to a certain extent improve high-speed rolling bearing performance.
Technical requirements for spindle bearings
2, and bearing service life:
General machine tools, spindle components of life mainly refers to the precision of the spindle using the term, therefore, maintain performance to meet requirements of NSK bearings precision spindle component life requirement. Heavy machine tools or heavy cutting machine tool, you should first consider the carrying capacity of deep groove ball bearings.

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