METHOD FOR PRODUCING PIPE MATERIAL AND MANDREL

The purpose of the present invention is to provide a method for producing a pipe material and to provide a mandrel with which resistance between a member to be processed and the mandrel during bending processing can be reduced and overall processing time can be shortened. The method for producing a...

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Bibliographische Detailangaben
Hauptverfasser:	SANO, Yoichi, KIYOTA, Yoshihiro, KAWAMOTO, Hiroshi, YASUI, Toyoaki
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL PERFORMING OPERATIONS PUNCHING METAL TRANSPORTING WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	The purpose of the present invention is to provide a method for producing a pipe material and to provide a mandrel with which resistance between a member to be processed and the mandrel during bending processing can be reduced and overall processing time can be shortened. The method for producing a pipe material comprises: a step for inserting a mandrel (2), which is provided on the inside thereof with a flow path (4) through which dry ice powder (3) flows and spray holes (7) at the tip thereof for spraying the dry ice powder (3), inside pipe material (1); a step for spraying the dry ice powder (3) from the spray holes (7) inside the pipe material (1); and a step for performing bending processing on the pipe material 1 wherein the mandrel (2) has been inserted.