Method for forming complex patterns in the interior of a pressed

Ammunition and explosive-charge making – Miscellaneous

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419 42, 419 68, C06B 2100, B22F 316

Patent

active

052275760

ABSTRACT:
Method and apparatus whereby complex patterns are pressed into the interior of a part formed of compactible material. A flexible, pre-fabricated pattern form bearing the inverse of a desired pattern is wrapped around a conventional mandrel and this assembly is loaded inside of an isostatic pressing bag with a material charge. After compaction, the mandrel is separated from the pattern form, leaving the pattern form behind in the compact. The pattern form is then peeled, pulled, or otherwise removed from the interior of the compact, leaving behind the desired on the compact interior. Alternatively, a collapsible or melt-away mandrel with the inverse of a desired pattern formed on its exterior is employed to form the desired pattern on the interior of a compacted part.

REFERENCES:
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patent: 3577635 (1971-05-01), Bergman et al.
patent: 3666454 (1972-05-01), Sarnes
patent: 3757693 (1973-09-01), Shea
patent: 3907949 (1975-09-01), Carlson
patent: 4057001 (1977-11-01), Valentine
patent: 4341557 (1982-07-01), Lizenby
patent: 4592283 (1986-06-01), Hellner et al.
patent: 4729789 (1988-03-01), Ide et al.
patent: 5012853 (1991-05-01), Bihlmaier
patent: 5066454 (1991-11-01), Hanson

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