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Stage of bearing superfinishing process


As the main parts of various mechanical operations, in order to obtain better performance and quality in the use of bearings, the ultra precision machining technology used in the machining process of bearings. The so-called precision machining process refers to various machining processes with machining accuracy and surface finish higher than that of corresponding machining methods.
4 stages of bearing superfinishing process:
(1) Strong cutting stage. When the rough peak of the workpiece surface contacts the oilstone surface, the contact stress is very large, which makes the abrasive particles broken and sharp, and the cutting effect is strong.
(2) Normal cutting stage. After a few seconds, the rough layer of the workpiece is removed, that is, it enters the normal cutting stage. There is no black chip attached to the oilstone surface, but the cutting continues.
(3) Grinding transition stage. The self sharpening of abrasive particles decreases, the edge of abrasive particles is smoothed, the chip oxide begins to embed into the gap of oilstone, and the abrasive powder blocks the pore of oilstone, so that the abrasive particles can only be cut weakly, accompanied by extrusion and polishing. At this time, the surface roughness of workpiece decreases quickly, and black chip oxide is attached to the surface of oilstone.
(4) Stop the cutting and grinding phase. The friction between the oilstone and the workpiece has been very smooth, the contact area has greatly increased, the pressure has decreased, and the abrasive particles can no longer break through the oil film to contact the workpiece. When the oil film pressure on the bearing surface is balanced with the oilstone pressure, the oilstone will float. An oil film is formed between them, which has no cutting effect at this time. This stage is unique to superfinishing.

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