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

1999-01-26

1999-12-14

Larson, Lowell A.

Metal deforming

By use of tool acting during relative rotation between tool...

With cutting of work or product

72117, 72123, B21C 3729

Patent

active

060002638

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 rotating and 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: 411780 (1889-10-01), Brownell
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: 3924432 (1975-12-01), Yarnold
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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