Super finishing sequence of bearings
The superfinishing sequence of a bearing can generally be divided into three steps: cutting, half cutting, and finishing finishing.
When the surface of the grindstone is in contact with the peak of the rough raceway surface, the contact area is small, and the force per unit area is large. Under a certain pressure, the grindstone is firstly subjected to the "anti-cutting" effect of the bearing workpiece, so that Part of the abrasive particles on the surface of the stone are detached and chipped, revealing some new sharp abrasive grains and edges.
At the same time, the surface peak of the bearing workpiece is subjected to rapid cutting, and the peaks on the surface of the bearing workpiece and the grinding deteriorated layer are removed by the action of cutting and reverse cutting. This phase is called the cutting phase, where most of the metal balance is removed.
2. Half cut of the bearing
As the machining continues, the surface of the bearing workpiece is gradually smoothed. At this time, the contact area of the grindstone with the surface of the workpiece increases, the pressure per unit area decreases, the depth of cut decreases, and the cutting ability is weakened. At the same time, the pores on the surface of the grindstone are blocked, and the grindstone is in a half-cut state.
This stage is called the semi-cutting stage of bearing finishing. In the half-cutting stage, the cutting marks on the surface of the bearing workpiece become shallower and a darker luster appears.
3. Finishing stage
This is the last step in the super finishing of the bearing. As the surface of the workpiece is gradually flattened, the contact area between the grindstone and the surface of the workpiece is further increased, and the surface of the grindstone and the bearing workpiece is gradually separated by the lubricating oil film, the pressure per unit area is small, the cutting action is reduced, and finally the automatic Stop cutting.
At this stage we call it the finishing phase. There is no cutting mark on the surface of the workpiece during the finishing stage, and the bearing exhibits a bright finished gloss.
Reprinted from the network