PRODUCTION METHOD AND PRODUCTION DEVICE FOR PIPE WITH SPIRALLY GROOVED INNER SURFACE

A method includes: the step of sending a raw tube (11) from a drum (21) to an unwinding side capstan (22) while the raw tube (11) is rotated around a central axis (C) perpendicular to a winding shaft (21a) of the drum (21) by rotating the drum (21) and the unwinding side capstan (22) about the centr...

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Bibliographische Detailangaben
Hauptverfasser:	SAKAGAMI, Takeshi, NAKAURA, Yusuke, HATERUMA, Yuki
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL PERFORMING OPERATIONS PUNCHING METAL TRANSPORTING
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Beschreibung
Zusammenfassung:	A method includes: the step of sending a raw tube (11) from a drum (21) to an unwinding side capstan (22) while the raw tube (11) is rotated around a central axis (C) perpendicular to a winding shaft (21a) of the drum (21) by rotating the drum (21) and the unwinding side capstan (22) about the central axis (C) concurrently with unwinding of the raw tube (11) from the drum (21) holding the raw tube (11), on an inner surface of which multiple straight grooves along a longitudinal direction of the raw tube are formed with an interval in a circumferential direction, in a coil shape, to wind the raw tube (11) around the unwinding side capstan (22); and the step of drawing in which the unwound raw tube (11) is drawn while the diameter of the raw tube (11) is reduced, and then the raw tube (11) is wound around the drawing side capstan (25) to twist the raw tube (11) and obtain an inner spiral grooved tube (11R).