Electrolysis: processes – compositions used therein – and methods – Electrolytic erosion of a workpiece for shape or surface... – With control responsive to sensed condition
Patent
1991-09-30
1997-11-11
Valentine, Donald R.
Electrolysis: processes, compositions used therein, and methods
Electrolytic erosion of a workpiece for shape or surface...
With control responsive to sensed condition
205645, 205665, 205672, 205686, 204224M, 204225, 204228, B23H 300, B23H 910, B23H 914, B23H 730
Patent
active
056859716
ABSTRACT:
A method and apparatus for forming a passage with a variable diameter along its length in a conductive workpiece are disclosed. The workpiece is mounted in a fixture and an externally insulated hollow electrode is positioned proximate to a surface location of the workpiece into which the passage is to be formed. A first selected voltage is connected between the electrode and the workplace with the voltage being connected to cause the electrode to act as a cathode and the workpiece to act as an anode. A pump causes an acidic electrolyte to flow through the electrode at a chosen pressure and onto the workpiece surface. The electrode is moved toward the workpiece at a first selected feed rate by a CNC controller to cause a portion of the passage to be formed at a first predetermined diameter. The CNC controller causes at least one of the first selected DC voltage to switch to a different selected DC voltage or the first selected feed rate to switch to a different selected feed rate when a predetermined depth is sensed by an encoder to cause another portion of the passage to be drilled at a second predetermined diameter.
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Edelman Oleg
Schroder Lawrence Joseph
Wayman Lathan Merriman
General Electric Company
Herkamp Nathan D.
Hess Andrew C.
Valentine Donald R.
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