Producing of tapered bent tube

Details Producing of tapered bent tube Producing of tapered bent tube

1998-08-28

2000-11-28

Jenkins, Daniel J.

Metal treatment

Process of modifying or maintaining internal physical...

Producing or treating layered, bonded, welded, or...

29890053, 29521, 72368, 84387R, C21D 908, G10D 710, B21D 2100

Patent

active

061530298

ABSTRACT:
A production of tapered bent tube wherein a U-cup with a full opening is pressed to form from a brass plate by a primary mold. The two ends of the full opening of the U-cup are of different calibers. The U-cup is subjected to tempering treatment to eliminate its processing stress. An assembly forming mold is used to punch the fill opening of the U-cup to form a rough shape of tapered bent tube with two different calibers at two ends, and between the two ends with different calibers is a flattened part. The flattened part on the tapered bent tube is removed to form a tapered bent tube; then, the seam of the tapered bent tube is welded and smoothed by roller pressing process, to complete the two ends of different calibers. With aforementioned production method, since the primary mold adopts an expansion approach to form the outside portion of the tapered bent tube, the expansion ratios on the inside and outside of the tapered bent tube can be approximated to avoid cracks, so as to produce a tapered bent tube with a consistent thickness to enable better sound effect.

REFERENCES:
patent: 4175419 (1979-11-01), Mabery
patent: 4830648 (1989-05-01), Klein et al.
patent: 5405459 (1995-04-01), Miyamoto et al.
patent: 5412869 (1995-05-01), Boltz et al.
patent: 5855699 (1999-01-01), Oyama et al.

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