Intrados induction heating for tight radius rotary draw bend

Details Intrados induction heating for tight radius rotary draw bend Intrados induction heating for tight radius rotary draw bend

1998-01-23

2000-03-21

Larson, Lowell A.

Metal deforming

By deflecting successively-presented portions of work during...

With modification or control of temperature or work, tool or...

72369, B21D 716

Patent

active

060389028

ABSTRACT:
A boost bend method of making tight radius bends in boiler tubes, such as bends having a radius of 1.times.D or less, in which a selected portion of the intrados of the tube is heated in a controlled manner thereby reducing the necessary tube wall thickness relative to the diameter of the tube for 180.degree. bends. Tubes bent using the method may have wall thicknesses of about 6.6% of the tube diameter and suffer less than about 7% thinning of the extrados tube wall.

REFERENCES:
patent: 3229489 (1966-01-01), Huet
patent: 4596128 (1986-06-01), Ringersma et al.
patent: 5491996 (1996-02-01), Baarman et al.

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