Method for forming an object of metal by cold pressing

Details Method for forming an object of metal by cold pressing Method for forming an object of metal by cold pressing

1989-01-25

1989-10-31

Combs, E. Michael

Metal deforming

With cleaning, descaling, or lubrication of work or product

Lubricating

72267, 72700, B21C 2332, B21C 2320, B21J 300

Patent

active

048768685

ABSTRACT:
A method for forming in a single step metal slugs of tantalum, niobium or a base alloy of one of these metals, by cold pressing. A lubricant film is either an oxide coating on the metal, into which a polytetrafluorethylene of low molecular weight is embedded, or it is a film of chlorotrifluorethylene. A metal slug is shaped by means of a hard-metal punch with a crowned bottom surface on its punch head and a rounded undercut in the area of the transition from the punch head to the punch shank.

REFERENCES:
patent: 3255621 (1966-06-01), Ohsol
patent: 3335073 (1967-08-01), Dunn
patent: 3777528 (1973-12-01), Sirantoine
patent: 4129022 (1978-12-01), Thonnes et al.

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