Apparatus for and method of electroerosively drilling a thin hol

Details Apparatus for and method of electroerosively drilling a thin hol Apparatus for and method of electroerosively drilling a thin hol

1981-10-19

1984-02-07

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

2041297, 204224M, 204225, 219 69M, 219 69D, 219 69E, B23P 102, B23P 112, B23K 916

Patent

active

044301804

ABSTRACT:
An apparatus for and method of electroerosively drilling a thin hole, e.g. of 1 mm diameter, of a high depth-to-diameter ratio, e.g. 5 or more, in a workpiece with a tubular electrode of corresponding high slenderness. The system utilizes a novel liquid-delivery mechanism which comprises a cylindrical reservoir communicating through an outlet opening thereof with the internal bore of the tubular electrode and hence with the machining gap and a plunger member for operative reception in the reservoir to be movable therein. Prior to a drilling operation, the reservoir is charged via a check valve with a given amount of the machining liquid from a source thereof. During the drilling operation, a motor advances the plunger member to move it within the chamber at a controlled rate. The charged machining liquid in the reservoir chamber is thus pressurized by the plunger member and discharged from and delivered through the internal bore of the tubular electrode into the machining gap at a regulated rate of flow.

REFERENCES:
patent: Re26531 (1969-03-01), Bender et al.
patent: 3399125 (1968-08-01), Mikoshiba et al.
patent: 3409535 (1968-11-01), Ross et al.
patent: 3536599 (1970-10-01), Williams
patent: 3773636 (1973-11-01), Augustin

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