Bearing installation on the main aspects of life
Determine the long life of the bearing a lot of factors, but generally
can be divided into two kinds, one internal factor (the bearing itself
factor), the other is the bearing external.
Bearing the main factors include structural design, manufacturing process and material quality and other three factors.
Bearings
are generally manufactured through forging, heat treatment, turning,
grinding and assembly and other multi-channel processing. However, the rationality of the processing technology, advanced, stability will also affect the bearing life. The heat treatment and grinding processes that affect the quality of
the finished bearing are usually more directly related to the failure of
the bearing.
The metallurgical quality of the bearing material was the main factor affecting the early failure of the rolling bearing. With
the progress of metallurgical technology (such as vacuum degassing of
bearing steel), the quality of raw materials is improved. The
proportion of raw material quality factors in bearing failure analysis
has been significantly reduced, but it is still one of the main factors
affecting bearing failure. Whether the selection is appropriate is still the bearing failure analysis must consider the factors.
(1)
on the fixed ring to take a small interference with the conditions of
matching both sides of the surface have a high shape accuracy and small
roughness, or difficult to disassemble the installation more difficult,
in addition, also need to consider the impact of spindle thermal
elongation The
(2)
the use of pairs of pairs of angular contact ball bearings spindle, the
majority of the load is lighter, with the amount of interference is too
large, then the internal axial preload will be significantly larger,
resulting in adverse effects. The use of dual-row short bearing spindle and bearing the spindle,
the load is relatively large, so the interference is also relatively
large.
(3) The roundness of the shaft and the seat hole and the vertical
dimension of the shoulder are required in accordance with the
corresponding accuracy of the bearing.
(4) it is necessary to accurately calculate the amount of interference
with the rotation of the ring, but also to accurately calculate the
appropriate fit with the fixed ring.
Rotation fists can also be made smaller within the possible range. As
long as the effective guarantee of thermal expansion at the operating
temperature, as well as the maximum speed under the influence of
centrifugal force, will not cause a tight fit surface of the creep or
sliding. Fixed ferrules According to the size of the work load and bearing
size, select a small gap with or interference fit, too loose or too
tight are not conducive to maintaining the original precise shape.
(5)
bearings such as high-speed conditions in the operation, and the
operating temperature is high, should pay special attention to the
rotation of the ring can not be too loose to prevent eccentric
vibration, and the fixed ring with the gap can not occur to prevent the
ring Under load deformation and vibration
Determine the long life of the bearing a lot of factors, but generally
can be divided into two kinds, one internal factor (the bearing itself
factor), the other is the bearing external.
Bearing the main factors include structural design, manufacturing process and material quality and other three factors.
Bearings
are generally manufactured through forging, heat treatment, turning,
grinding and assembly and other multi-channel processing. However, the rationality of the processing technology, advanced, stability will also affect the bearing life. The heat treatment and grinding processes that affect the quality of
the finished bearing are usually more directly related to the failure of
the bearing.
The metallurgical quality of the bearing material was the main factor affecting the early failure of the rolling bearing. With
the progress of metallurgical technology (such as vacuum degassing of
bearing steel), the quality of raw materials is improved. The
proportion of raw material quality factors in bearing failure analysis
has been significantly reduced, but it is still one of the main factors
affecting bearing failure. Whether the selection is appropriate is still the bearing failure analysis must consider the factors.
(1)
on the fixed ring to take a small interference with the conditions of
matching both sides of the surface have a high shape accuracy and small
roughness, or difficult to disassemble the installation more difficult,
in addition, also need to consider the impact of spindle thermal
elongation The
(2)
the use of pairs of pairs of angular contact ball bearings spindle, the
majority of the load is lighter, with the amount of interference is too
large, then the internal axial preload will be significantly larger,
resulting in adverse effects. The use of dual-row short bearing spindle and bearing the spindle,
the load is relatively large, so the interference is also relatively
large.
(3) The roundness of the shaft and the seat hole and the vertical
dimension of the shoulder are required in accordance with the
corresponding accuracy of the bearing.
(4) it is necessary to accurately calculate the amount of interference
with the rotation of the ring, but also to accurately calculate the
appropriate fit with the fixed ring.
Rotation fists can also be made smaller within the possible range. As
long as the effective guarantee of thermal expansion at the operating
temperature, as well as the maximum speed under the influence of
centrifugal force, will not cause a tight fit surface of the creep or
sliding. Fixed ferrules According to the size of the work load and bearing
size, select a small gap with or interference fit, too loose or too
tight are not conducive to maintaining the original precise shape.
(5)
bearings such as high-speed conditions in the operation, and the
operating temperature is high, should pay special attention to the
rotation of the ring can not be too loose to prevent eccentric
vibration, and the fixed ring with the gap can not occur to prevent the
ring in Under load deformation and vibration.
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