Superfinishing Principle of Operation
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Superfinishing Principle of Operation
Superfinishing Principle of Operation - Fig shows the principle of operation of superfinishing.
Principle of Operation of Superfinishing
| A - Work rotates | B - Block reciprocates |
An abrasive block shaped to the appropriate form reciprocates across the face of the work with a similar amount of overrun at each end of the stroke. As the same time the workpiece rotates about its axis. These two motions impart to the work a super finish and a high degree of geometric accuracy.
The area of contact between the abrasive block face and the work is greater than in honing, giving more cutting points and even less pressure/grit and hence less heat/grit.
Superfinishing employs:
(i) Very light, controlled pressure (0'7 to 2'75 kg/cm2) OR the workpiece through the abrasive block.
(ii) Rapid (over 400 per minute), short strokes (less than 6 mm in length).
(iii) Controlled stroke paths so that a single grit never traverses the same path twice.
(iv) Copious amounts of low viscosity lubricant coolant (e.g. kerosene mixed with heavier cutting oil) flooded over the surface.
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