Electroforming mandrel and method of fabricating and using same
US4902386A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 1989 |
| Grant date | Feb 20, 1990 |
| Priority date | — |
| Expiry date | Aug 2, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D1/02
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
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, PA0 b=1/2 the height of the minor axis of the ellipse and has a value at least about 1,000 times greater than the thickness of said plated metal coating on said parallel sides, and PA0 x and y define a point lying along the outer surface of the ellipse measured from the center of the ellipse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.