Spin forming of HVAC duct reducers

Details Spin forming of HVAC duct reducers Spin forming of HVAC duct reducers

2006-10-24

2006-10-24

Tolan, Ed (Department: 3725)

Metal deforming

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

During rotation of work

C072S083000

Reexamination Certificate

active

07124609

ABSTRACT:
Method of a spin forming conical fittings for HVAC systems from 10 to 26-gauge steel material. A flat pattern is cut, stamped or otherwise formed from flat sheet stock or roll stock. The pattern is rolled or otherwise formed into a frustoconical shape. The workpiece is engaged with a die, and the end portions of the workpiece are formed as the workpiece is spun to press the workpiece against the die. In this manner, a small diameter collar portion is formed at the smaller end of the conical connector and/or a larger diameter collar portion is formed at the larger diameter end of the conical connector. Also, a flange connector can be formed at the larger and/or smaller end portions of the conical connector using spin forming or a combination of spin forming and roll forming techniques.

REFERENCES:
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patent: 3258833 (1966-07-01), Schuttler
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patent: 5983496 (1999-11-01), Hermanson
patent: 6289706 (2001-09-01), Hermanson
patent: 6694791 (2004-02-01), Johnson et al.
patent: 63-309339 (1988-12-01), None

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