Process for producing hollow extrudate for use in vacuum

Details Process for producing hollow extrudate for use in vacuum Process for producing hollow extrudate for use in vacuum

1987-01-29

1989-05-09

Zimmerman, John J.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

138143, B32B 1520, F16L 902

Patent

active

048289370

ABSTRACT:
A hollow extrudate for use in a vacuum is produced by a process comprising the steps of hermetically closing the forward open end of a hollow shaped material immediately after extrusion from a billet, cutting the shaped material after a predetermined length thereof has been subsequently extruded and hermetically closing the cut end at the same time, and cutting off the closed ends. The billet is a composite material composed of a core of aluminum having a high purity of at least 99.9% and an aluminum alloy cladding. The extrudate obtained has an inner layer and an outer layer corresponding to the core and the cladding, respectively.

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patent: 4578973 (1986-04-01), Ishimaru et al.
patent: 4632885 (1986-12-01), Tanabe et al.

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