Method and apparatus for reforming a tube

Details Method and apparatus for reforming a tube Method and apparatus for reforming a tube

1994-07-13

1995-10-17

Jones, David

Metal deforming

By application of fluent medium, or energy field

By kinetic energy of fluid or field

72430, 294192, B21D 2614

Patent

active

054579775

ABSTRACT:
A method and apparatus for reforming, by either radially expanding or reducing an electrically conductive tubular workpiece (11). The method of the expansion embodiment comprises the steps of inserting an insulated electrical conductor (21) into the tube; then making up an electrical circuit that includes the portion of the wall of the tube in series or parallel connection with the electrical conductor and a source of electrical power (C and SW), then applying a voltage across the circuit. The current flowing through the conductor and the tube produces a circumferential electromagnetic field between the conductor and the tube. The current in the tube, interacting with the magnetic field, produces a radially directed outward force on the tube. If the force is sufficiently great and of a duration longer than the time required for a sound wave to pass through the tube wall, the tube wall will radially expand and be permanently deformed. The method of the reduction embodiment comprises the additional step of inserting the workpiece in an electrically conductive sleeve (51) and the making up step comprises including the sleeve in the electrical circuit and arranging the workpiece and the conductor in parallel circuit relationship. The respective apparatus of the two embodiments implement the method of the invention. The expansion embodiment of the invention is particularly adapted to the expansion of tubes in plate fin and tube type heat exchangers.

REFERENCES:
patent: 3187532 (1965-06-01), Furth
patent: 3345732 (1967-10-01), Brower
patent: 3599461 (1971-08-01), Astl
patent: 3599462 (1971-08-01), Kline
patent: 3618350 (1971-11-01), Larrimer, Jr. et al.
patent: 4285224 (1981-08-01), Shkatov et al.
patent: 4619127 (1986-10-01), Sano et al.
patent: 4947667 (1990-08-01), Gunkel et al.
patent: 4962656 (1990-10-01), Kunerth et al.
patent: 5331832 (1994-07-01), Cherian et al.
patent: 5353617 (1994-10-01), Cherian et al.

Affiliated with

Also associated with

Rating

Method and apparatus for reforming a tube does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for reforming a tube, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for reforming a tube will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-589214