Electric discharge machining apparatus with a vertically movable

Details Electric discharge machining apparatus with a vertically movable Electric discharge machining apparatus with a vertically movable

1992-12-09

1993-11-23

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

B23H 100

Patent

active

052646769

ABSTRACT:
In an electric discharge machining apparatus, a vertically movable processing tank is provided for reserving therein a processing liquid. The processing tank is variable in a vertical direction. A link mechanism is used as a unit for vertically moving the processing tank. A processing-tank vertically-moving arrangement has an air cylinder for retaining the processing tank through an entire stoke of the processing tank moving vertically and a spring operative through the entire stroke and having a retaining force which varies depending upon a position of the stroke without the necessity of control from the outside. In a second embodiment a cylindrical bellows element is used to seal a table on which the workpiece is mounted to the tank.

REFERENCES:
patent: 4808787 (1989-02-01), Futamura

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