Branch pipe forming tool and method of forming branch pipe on me

Details Branch pipe forming tool and method of forming branch pipe on me Branch pipe forming tool and method of forming branch pipe on me

1996-04-17

1999-08-31

Schwartz, Larry I.

Metal working

Method of mechanical manufacture

Gas and water specific plumbing component making

408 22, 72 70, 72 71, B23P 1500

Patent

active

059437731

ABSTRACT:
A branch pipe is formed on a metal tube using a forming tool including a milling part and a burring part adjacent the milling part. The milling part has a first diameter and is provided with a prescribed cutting edge on its outer peripheral surface. The burring part has a sloping surface with a maximum second diameter larger than the first diameter, and has a slope diameter that gradually diminishes in a direction away from the milling part. The branch pipe forming tool can be used for forming a branch pipe on a metal tube regardless of the shape of the metal tube. In a method of forming a branch pipe on a metal tube with the tool, the milling part is used to form an opening in the wall of the metal tube, the burring part is inserted through the opening into the tube, and then pulled back out of the opening while revolving along a prescribed path, so that the sloping surface of the burring part outwardly deforms the edge of the opening so as to form the flared flange or branch pipe extending from the metal tube.

REFERENCES:
patent: 1670216 (1928-05-01), Savadow
patent: 2045235 (1936-06-01), Newman
patent: 2669889 (1954-02-01), Huller
patent: 3468147 (1969-09-01), Davies
patent: 4400959 (1983-08-01), Reigner et al.
patent: 4413485 (1983-11-01), Larikka
patent: 4414835 (1983-11-01), Larikka
patent: 5000630 (1991-03-01), Riley et al.

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