Superfinishing is used not only in the bearing industry, but also in the engine industry. Other precision machinery and instruments also began to use this process. What is a superfine full complement cylindrical roller bearing? Superfinishing of full complement cylindrical roller bearings is a finishing process that enables micro-grinding through feed motion. Surfaces before superfinishing are usually precision turned and ground. Specifically, it means that under good lubrication and cooling conditions, a small pressure is applied to the workpiece with fine-grained abrasives (stones), and the workpiece is rotated at a certain speed in the vertical dry workpiece rotation direction to achieve fast and short-term rotation. A finishing method of reciprocating oscillating motion. What is the role of superfinishing of full complement cylindrical roller bearings? In the manufacturing process of rolling bearings, super-finishing is in the final stage of bearing ring processing to reduce or eliminate the arc deviation left by grinding, repair the shape of channel errors, refine its surface roughness, and improve physical and mechanical properties. Improve the surface to reduce the vibration of the bearing, generate noise, and improve the function of the bearing, which plays an important role. It can be embodied in the following three aspects 1, which can effectively reduce the ripple. In the ultra-finishing process, in order to ensure that the stone always acts on the wave crest and does not contact the wave trough, the contact arc between the stone and the workpiece is larger than the wavelength of the surface waviness of the workpiece. In this way, the contact pressure of the wave crest is large, and the convex crest is removed, thereby reducing the waviness. 2. Improve the groove shape error of the ball bearing raceway. Superfinishing can effectively increase the raceway groove error by about 30%. 3. It can generate compressive stress on the surface of the ultra-fine surface. During the superfinishing process, major cold plastic deformation occurs, resulting in residual compressive stress on the workpiece surface after superfinishing. 4. The contact area of ​​the working surface of the ring can be increased. After superfinishing, the contact bearing area of ​​the annular working surface can be increased from 15%-40% to 80%-95% after grinding. Bearing super-finishing: 1. Cutting bearings When the surface of the grinding stone is in contact with the convex peaks of the rough raceway surface, the 'reverse cutting' is performed on the grinding stone under a certain pressure due to the small contact area and the large force per unit area. . The action of the bearing workpiece causes the abrasive particles on the surface of part of the grindstone to fall off and break, exposing some new sharp abrasive particles and edges. At the same time, the convex peaks on the surface of the bearing workpiece are rapidly cut, and the convex peaks and the grinding deterioration layer on the surface of the bearing workpiece are removed through the action of cutting and reverse cutting. This stage is called the cutting stage, where most of the excess metal is removed. 2. Half-cut of the bearing As the processing continues, the surface of the full complement cylindrical roller bearing workpiece gradually becomes flat. At this time, the contact area between the stone and the surface of the workpiece increases, the pressure per unit area decreases, the cutting depth decreases, and the cutting ability is weakened. At the same time, the holes on the surface of the stone are blocked, and the stone is in a half-cut state. This stage is called the half-cut stage of bearing finishing. During the half-cut stage, the cut marks on the surface of the bearing workpiece become lighter and have a darker sheen. 3. This stage can be divided into two steps: one is the grinding transition stage; the other is the grinding transition stage. The second is the grinding phase after the cut is stopped. The grinding transition phase: the abrasive grains are reduced, the edges of the abrasive grains are flattened, and the chip oxides begin to embed in the crevices of the whetstone. The abrasive powder blocks the pores of the oilstone, so the abrasive grains can only be weakened by cutting and squeezing. At this time, the surface roughness of the workpiece is rapidly reduced, and the surface of the whetstone is adhered by black flake oxides. Stop the cutting and grinding stage: When the oil film is pressed on the support surface and the oil, the friction between the oil stone and the workpiece is very smooth, the contact area is greatly increased, the pressure drops, and the abrasive particles cannot penetrate the oil film and contact the workpiece. The pressure of the stone is balanced, and the oil stone floats. In the process of oil film formation, there is no cutting effect. This stage is specific to superfinishing.
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