Method and apparatus of manufacturing grooved pipe, and structure thereof

a manufacturing method and groove technology, applied in the direction of indirect heat exchangers, lighting and heating apparatus, other domestic articles, etc., can solve the problems of uneven length of pipe, product quality is not stable, and the forming range of grooves in the longitudinal direction of inner pipes is not stable, so as to achieve the effect of manufacturing a grooved pip
US20060112556A1Inactive Publication Date: 2006-06-01DENSO CORP +1
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
DENSO CORP
Publication Date
2006-06-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method of manufacturing a grooved pipe includes a pressing step and a longitudinally displacing step. The pressing step presses a grooving tool toward an outer surface of a wall of a pipe in a radially inward direction of the pipe at a location, which is separated by a predetermined distance from an end portion of the pipe. The longitudinally displacing is performed by longitudinally displacing at least one of the grooving tool and the pipe relatively in a longitudinal direction of the pipe while pressing the grooving tool toward the outer surface of the wall of the pipe to form a groove portion, which is recessed from the outer surface of the wall of the pipe. The method is suitably used for forming an inner pipe of a double-wall pipe.
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Description

CROSS REFERENCE TO RELATED APPLICATION

[0001] This application is based on and incorporates herein by reference Japanese Patent Applications No. 2004-325522 filed on Nov. 9, 2004, No. 2004-325521 filed on Nov. 9, 2004, No. 2005-112825 filed on Apr. 8, 2005, No. 2005-136390 filed on May 9, 2005 and No. 2005-263967, filed on Sep. 12, 2005. BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to a method and apparatus for manufacturing a grooved pipe, and relates to a structure of a grooved pipe. The structure of the grooved pipe is suitably used for a double-wall pipe.

[0004] 2. Description of Related Art

[0005] Conventionally, a grooved pipe is known to serve as, for example, an inner pipe, which is included in a double-wall pipe.

[0006] Unexamined Japanese Patent Publication No. 2003-329376 discloses a conventional forming method of a grooved pipe for a double-wall pipe. The double-wall pipe includes inner and outer pipes having mutually ...

Claims

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