Recoverable and reusable cold forging dies

Details Recoverable and reusable cold forging dies Recoverable and reusable cold forging dies

1997-01-29

1998-03-17

Larson, Lowell A.

Metal deforming

Tool and/or tool holder

761071, B21J 1302

Patent

active

057274207

ABSTRACT:
A recoverable and reusable cold forging die, including: a metallic die frame, a bottom lid having several metallic strut spacers and bolt holes, a plastic film made of PET or PVC plastic material provided on the top of the die frame, several sheets of Kevlar fibers as an upper filler layer, and several sheets of stainless steel as a lower filler layer, the bottom lid is added after turning upside down of the die, mercury and steel beads or iron sand are poured into the bolt holes until full loading, then they are fast frozen under a low temperature below -40.degree. C., thus the cold forging die resistive to cold forging punching pressure is formed, after forging, the die is defrozen to recover the mercury and to detach the plastic film, the recoverable and changeable cold forging die can be reused by changing the cavity thereof.

REFERENCES:
patent: 3125974 (1964-03-01), Toulmin, Jr.
patent: 4509358 (1985-04-01), Krowl

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