Study on Electrolytic Abrasive Machining (1st Report)
Electrolytic Lapping of Cemented Carbide
1965 Volume 31 Issue 362 Pages 234-239
Details
1965 Volume 31 Issue 362 Pages 234-239
A new process of hard metal working called electrolytic lapping was studied. A rotating mild steel plate lap was connected to the negative pole of D.C. source and work pieces of cemented carbide were to the positive. Abrasives suspended in electrolyte were thrown on the lap surface by its own rotation. Experimental results obtained are as follows.
(1) The surface roughness finished is 1μ Hmax and edge roundness is 0.05 mm in the following condition : lap speed 9.3 m/sec; work pressure 1 kg/cm2; electrolyte NaNO3 5%+NaNO2 5%+NaF 5% mixed water solution; abrasives 320 mesh SiC; mix ratio 0.25g/cc; current density 30 A/cm2.
(2) When the carbide alloys containing 6% Co (G2K, S2) are worked, stock removal rates are not proportional to the electric currents and have a maximum and a minimum. In the maximum point stock removal rate is 0.04 g/A min and in the range of relatively high current density (over 20 A/cm2) it becomes 0.013 g/A min, which is similar to the rate of common electrolytic grinding.
(3) Tool wear was 45% of lost carbide alloys in volume through the whole experiments, and in the optimum condition it may be about 20%.
