Electric heating – Metal heating – By arc
Patent
1989-05-26
1991-09-24
Albritton, C. L.
Electric heating
Metal heating
By arc
29558, 219 6912, B23K 2600
Patent
active
050515594
ABSTRACT:
A block of electrically-conductive material which is to be formed into a body with internal and/or external surfaces that approximate hyperboloids of one sheet is placed so that its axis is set at a predetermined skew angle with relation to a travelling EDM electrode wire and the electrode wire is then moved into cutting proximity of the body wire. Thereafter, by revolving the body about its own axis, the external and/or internal surfaces of the body will be cut into an approximate hyperbolic surface of revolution depending upon whether the body is positioned with the cutting wire outside of the body or in a previously-formed longitudinal passage in the body. As an alternative technique, elongated channels can also be cut into the walls of the body of successively orienting the body to a selected number of angular positions with the electrode wire being either outside of the body or in a previously-formed passage in the body. At each of these angulr positions, the electrode wire is moved orthogonally with respect to the axis of the wire while both the body axis skew angle and the rotational position about that axis is controlled for cutting a channel or groove in the body as required to relieve stresses in the material of the body or to convey a coolant fluid.
REFERENCES:
patent: 3566722 (1971-03-01), Audet
patent: 4010345 (1977-03-01), Banes et al.
patent: 4601224 (1986-07-01), Clark, III
patent: 4852232 (1989-08-01), Wells
Adams Harold W.
Albritton C. L.
Fein Edward K.
Schlorff Russell E.
The United States of America as represented by the Administrator
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