1. The falling cutting stage, this constant pressure honing, at the beginning, due to the rough wall of the hole, the contact area between the oil stone and the hole wall is small, the contact pressure is large, and the convex portion of the hole wall is quickly worn away. However, due to the high contact pressure on the surface of the oil stone and the wear of the oil-and-binder binder by the chips, the bonding strength between the abrasive particles and the binder is reduced. Therefore, some of the abrasive grains fall off under the action of the cutting pressure, and the surface of the oil stone is exposed. Abrasive grain, this is the oil stone self-sharp.
2. In the crushing and cutting stage, as the honing progresses, the surface of the hole becomes more and more light, the contact area with the oil stone becomes larger and larger, the contact pressure per unit area decreases, and the cutting efficiency decreases. At the same time, the cut chips are small and thin, and the chips wear little to the binder. Therefore, the oil stone abrasive grains are less detached, and at this time, the grinding is not performed by the new abrasive grains but by the abrasive grain tips. Therefore, the tip of the abrasive grain is heavy, and the abrasive grain is easily broken and broken to form a new cutting edge.
3. Blocking the cutting stage, the contact area between the oil stone and the hole surface is getting larger and larger when the honing is continued, and the fine chips accumulating between the oil stone and the hole wall are not easily excluded, causing the oil stone to be clogged and become smooth. Therefore, the stone cutting ability is low, which is equivalent to polishing. If the honing is continued and the oil stone is clogged and the adhesive blockage occurs, the oil stone completely loses its cutting ability and is severely heated, and the accuracy and surface roughness of the hole are affected. At this point, the honing should be ended as soon as possible.