In order to improve the lapping efficiency of steel balls, has been developed a new lapping method. Instead of the upper lap plate being floating supported, as in the conventional lapping, it is used a supersonically vibrating plate.
In this paper, the results obtained from the fundamental experiments are described.
The major findings are as follow :
(1) Supersonic lapping under the optimum lapping conditions is superior to ability of conventional lapping caused by vibration.
(2) The lapped quantity has been affected not only by the impact energy but the lapping pressure, and in the case of lower amplitude was proportional to the lapping pressure, and vice versa to higher amplitude in the extent of this experimental conditions. (frequency 22 kc, amplitude 10-14.5 μ, lapping pressure 40-120 g per piece, ball dia. 2 mm)
(3) The increasing rate of sphericity per unit lapped quantity is generally related in inverse proportion to the impact energy, and has been affected by the impact energy rather than the lapping pressure.
(4) The physical and mechanical properties of the finished surface varied considerably according to the magnitude of impact energy and lapping pressure, and become better in the case with smaller the magnitude.
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