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Title:
MANUFACTURE OF INSIDE SURFACE DOUBLE GROOVED TUBE
Document Type and Number:
Japanese Patent JPH04274816
Kind Code:
A
Abstract:

PURPOSE: To manufacture the inside surface double grooved tube for a heat exchanger at the same working speed as a conventional inside surface single grooved tube, to prevent the occurrence of generation of rolling-up and a rupture of the tube on the outside surface of the tube, and also, to form the prescribed groove shape.

CONSTITUTION: In the manufacturing method for placing thread rolling tools 6, 7 for executing wire diameter working, while rotating like a planet on a plane being orthogonal to a tube axis in two stages on the same axis as an extrusion die, placing grooved plugs 3, 4 connected to a reduction plug in the corresponding position of each thread rolling tool, and executing grooving doubly and continuously in a pipe 1, this manufacturing method for the inside surface double grooved tube constitutes a characteristic feature of executing the grooving by a grooved plug whose outside diameter is ≥7.5mm, and thereafter, executing thin diameter working of 10-50% by sink drawing reduction of once or twice or more, and finishing to 8-4mm outside diameter.


Inventors:
Yamamoto, Koji
Kawaguchi, Hiroshi
Hashizume, Toshiaki
Application Number:
JP1991000058387
Publication Date:
September 30, 1992
Filing Date:
February 28, 1991
Export Citation:
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Assignee:
FURUKAWA ELECTRIC CO LTD:THE
International Classes:
B21C1/22; B21C1/00; B21C3/16; B21D53/06; B21H7/14; F28F1/40; (IPC1-7): B21C1/22; B21C3/16; B21D53/06; B21H7/14; F28F1/40