INCREASING ELECTROCHEMICAL MACHINING RATES
MASSACHUSETTS INST OF TECH CAMBRIDGE
Pagination or Media Count:
Phenomena which may limit the rate of Electro-Chemical-Machining ECM are postulated, and indirectly studied by attempting their elimination. Of the mechanisms studied, three appear most promising 1 Elevated electrolyte pressure in the ECM zone reduces boiling, cavitation, and formation of hydrogen bubbles. As a result, drilling rates of 1.5 inmin have been attained at current densities up to 19,700 ampssq in. This can be compared with a typical maximum rate of 14 inmin. 2 The use of fused salt electrolytes such as NaOH appears quite promising for difficult-to-ECM materials such as tungsten-carbide. 3 Pulsed Dc current with short reverse spikes appears promising for materials such as tungsten-carbide which normally form relatively impervious reaction layers.
- Fabrication Metallurgy