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How to constant pressure the honing tube
The first stage is the shedding cutting stage. This kind of constant pressure honing, at the beginning, due to the rough hole wall, the contact area between the whetstone and the hole wall is very small, the contact pressure is large, and the protruding part of the hole wall is quickly worn away. Due to the high contact pressure on the surface of the whetstone and the wear of the whetstone binder by chips, the bonding strength between the abrasive grains and the binder decreases. Therefore, some abrasive grains fall off on their own under the action of cutting pressure, and new abrasive grains are exposed on the whetstone surface, which is self-sharpening of the whetstone.
The second stage is the crushing and cutting stage. As honing proceeds, the surface of the hole becomes brighter and smoother, the contact area with the whetstone becomes larger and larger, the contact pressure per unit area decreases, and the cutting efficiency decreases. At the same time, the chips cut are small and fine, and the wear of these chips on the binder is also very small. Therefore, the whetstone abrasive grains fall off very little. At this time, the grinding does not rely on new abrasive grains, but is cut by the abrasive grain tips. Therefore, the load on the tip of the abrasive grain is very large, and the abrasive grain is easy to break and collapse to form a new cutting edge.
The third stage is the clogged cutting stage. When honing continues, the contact area between the whetstone and the hole surface becomes larger and larger. Very fine chips accumulate between the whetstone and the hole wall and are difficult to remove, causing the whetstone to become blocked and become very smooth. Therefore, the cutting ability of whetstone is extremely low, which is equivalent to polishing. If honing is continued and the whetstone is seriously clogged and adhesive blockage occurs, the whetstone will completely lose its cutting ability and become severely heated, and the hole accuracy and surface roughness will be affected. At this point, honing should be completed as soon as possible.
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