Spin forming of HVAC duct reducers
OwnerJeffrey Allen Hermansoninventor
Life of this patent
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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.
Claims12
The method of making conical connectors that are open at both ends for use in HVAC ducting, comprising:
- placing a conically shaped workpiece that is open at both ends and is of 22–26 gauge metallic material into engagement with a spin die, the spin die having at least one generally cylindrically shaped surface portion;
- spinning the conically shaped workpiece that is open at both ends about its longitudinal central axis;
- and
- forming the conically shaped workpiece that is open at both ends as the workpiece is spinning to conform either one or both longitudinal ends of the workpiece to the shape of the spin die generally cylindrically shaped surface portion.
Dependencies are inferred from the claim text.