Electroforming mandrel and method of fabricating and using same

Details Electroforming mandrel and method of fabricating and using same Electroforming mandrel and method of fabricating and using same

1989-08-02

1990-02-20

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

204281, C25D 102

Patent

active

049023861

ABSTRACT:
A cylindrical electroforming mandrel and method of fabricating and using same, the mandrel having a substantially cylindrical mandrel core having substantially parallel sides and at least one tapered end having curved sides which converge toward an apex, and a plated metal coating on the parallel sides and the tapered end, the profile of an axial cross section of the tapered end from the intersection between the curved sides and the parallel sides to about the apex having the shape of half an ellipse defined by the formula: ##EQU1## where: a=1/2 the length of the major axis of the ellipse and has a value between about 2.3b and about 1.7b,

REFERENCES:
patent: 3669849 (1972-06-01), Schmidt
patent: 3844906 (1974-10-01), Bailey et al.
patent: 4024045 (1977-05-01), Thierstein
patent: 4067782 (1978-01-01), Bailey et al.
patent: 4501646 (1985-02-01), Herbert
patent: 4530739 (1985-07-01), Hanak et al.

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