Method and apparatus for the manufacture of record stampers

Details Method and apparatus for the manufacture of record stampers Method and apparatus for the manufacture of record stampers

1984-03-29

1985-06-11

Stallard, Wayland

Metal treatment

Compositions

Heat treating

148 115N, 148 115Q, 266249, 369283, 425810, C22F 100, C22F 110

Patent

active

045226598

ABSTRACT:
An improved method and apparatus is provided for the manufacture of stampers in which the stampers are electroformed from a relatively hard metal in a flat configuration and then, either before or after shaping of the shaped inner and outer edges, but prior to the use in the pressing of records, the inner and/or outer edges are selectively annealed to increase the ductility of these portions while retaining hardness of the remainder of the stamper.

REFERENCES:
patent: 3932097 (1976-01-01), Press
patent: 4057831 (1977-11-01), Jacobs et al.
patent: 4363844 (1982-12-01), Lewis et al.
patent: 4414167 (1983-11-01), Prusak et al.
patent: 4478566 (1984-10-01), Prusak et al.

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