In lapping steel balls, we experimentally studied the effect of physical properties of lapping liquid on lapping quantity, sphericity and finished surface. For facilitating analysis of lapping liquid effects, we used, besides cast-iron lap, phenol-lap manufactured for tests which contains abrasive grains.
From the experimental result, we obtained following conclusions.
(1) Lapping quantity increased almost proportionally with increase of viscosity, but surface-tension effects were unnoticeable when it was below 35 dyne/cm.
(2) Lapping quantity varied with ratio of mixed abrasive grains, but the effect was unobserved upon sphericity and finished surface.
(3) We could discriminate the good or bad of finished percentage according to cutting resistance in case of using cast-iron lap, but the cutting resistance had proportional relations with only lapping quantity in case of using phenol-lap.
(4) Although lapping quantity, sphericity and surface condition depended on lapping liquid and lapping pressure in case of using cast-iron lap, and inclinations of lapping quantity and finished percentage were contrary to each other, these effects were small but stable in case of using phenol-lap. Therefore phenol-lap seems to excel in all points.
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