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US 2003/0182980 A1Published application
Apparatus for producing internally grooved tube
AssigneeKabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
InventorsNobuaki Hinago, Chikara Saeki, Kiyonori Ozeki, Hideki Iwamoto
Life of this patent
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Abstract
An apparatus for producing an internally grooved seamless tube by rolling. The apparatus has pressing rolls 3 and back-up rolls 20, which work with a constant load under control by the load detector 21 to form uniform grooves without breaking the mother tube.
Claims6
An apparatus for producing an internally grooved tube comprising a rolling-grooving unit, said rolling-grooving unit comprising:
- a plug shaft placed in a mother tube;
- a grooved plug placed in the mother tube, said grooved plug being rotatably supported by said plug shaft;
- a pair of pressing rolls, with inwardly rounded periphery, rolling on said mother tube, said pressing rolls being placed outside said mother tube at a position corresponding to said grooved plug, with their axes being parallel to each other and perpendicular to the axial direction of said mother tube;
- a drive mechanism to rotate said pressing rolls in the drawing direction of the mother tube;
- a pair of back-up rolls to press said pressing rolls in the direction in which said pressing rolls press the mother tube;
- a load detector to detect the load applied to at least either of said pressing rolls and said back-up rolls;
- and a control unit to keep constant the pressing load applied to at least either of said pressing rolls and said back-up rolls according to the values measured by said load detector.
4 more elements
Dependencies are inferred from the claim text.