BULGING METHOD

PROBLEM TO BE SOLVED: To provide a bulging method capable of highly stretching a branch pipe without generating any wrinkles or cracks in a metal pipe. SOLUTION: The metal pipe P having a bend or curved portion is subjected to the internal pressure to be bulged into a cavity part 15 for stretching o...

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Bibliographische Detailangaben
Hauptverfasser:	HIRAMATSU KOICHI, SATO KOICHI, HIROSHIGE ITSURO, MANO KYOICHI
Format:	Patent
Sprache:	eng
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:	PROBLEM TO BE SOLVED: To provide a bulging method capable of highly stretching a branch pipe without generating any wrinkles or cracks in a metal pipe. SOLUTION: The metal pipe P having a bend or curved portion is subjected to the internal pressure to be bulged into a cavity part 15 for stretching on one side of a bulging die 10. Axial compression is applied to the metal pipe by an axial compression die 12 to form a bulge-stretching in the cavity part 15 for stretching while reducing the width of the cavity part 15 for stretching by moving dies 13 and 14. A counter die 16 provided in the cavity part for stretching is brought into contact with a top of a bulged part to preferably perform the bulge-stretching under a predetermined pressure. The T-shaped branch can be stretched to the height several times larger than a conventional value.