Basic knowledge of hard grinding of bearing steel balls

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Basic knowledge of hard grinding of bearing steel balls

Source: China Bearing Network Time: 2013-12-04

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Bearings I trust we have seen; we often use bicycles with bearings; and the cars we often ride also have bearings; only the size and style of the bearings are different; the world's best bearings are SKF bearings; So how is the steel ball in the SKF bearing made? Many people still don't know the manufacturing process of the bearing; the steel ball inside the bearing is very important; if the hardness is not enough, then the whole bearing can't be used. Let's analyze the basic knowledge of the hard grinding of the bearing steel ball.
Steel ball processing skills: The hard grinding steel ball of the bearing steel ball is ground after grinding in the grinding machine with a grinding wheel. The effect is to eliminate the shortcomings of soft grinding (or light grinding); remove the surface oxidation that occurs during heat treatment, Decarburization, deformation and shortcomings of troostite arrangement; further improvement of precision and appearance quality. During or after hard grinding of steel ball; appearance should be observed for appearance defects; after cold pickling to view burns; burns can usually be divided into secondary tempering Burns and secondary quenching burns; secondary tempering burns are black after cold pickling; secondary quenching burns are gray martensite after cold pickling; surrounded by black troostite. Presents linear burns, spots Burns and arctic burns (big ball burns).
The cause of burns in the Arctic:
1. Some dead angles on the machine tool; make a single ball not get the normal grinding surface into a large ball; the big ball only revolves in the groove; no rotation is kneaded by the two groove edges of the grinding wheel,
2. A certain groove is blocked by the grinding wheel block and the material of the material of the head; it is not detected and removed in time; for a long time; the groove will become shallow; when the ball enters the groove again from the head; it can be burned in the north and south poles.

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