METHOD FOR MANUFACTURING HOLLOW EXTRUDED MATERIAL

PROBLEM TO BE SOLVED: To manufacture a hollow extruded material while cooling an extrusion die at low cost. SOLUTION: By using an extrusion die (20) having an opening part (28) in an end face on the downstream side of a mandrel (22) for forming a hollow part (2) of an extruded material (1), and prov...

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Bibliographische Detailangaben
Hauptverfasser:	TANAKA KOICHI, TATE TERUO, SAKIHAMA HIDEKAZU, MOMO YOICHI
Format:	Patent
Sprache:	eng
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:	PROBLEM TO BE SOLVED: To manufacture a hollow extruded material while cooling an extrusion die at low cost. SOLUTION: By using an extrusion die (20) having an opening part (28) in an end face on the downstream side of a mandrel (22) for forming a hollow part (2) of an extruded material (1), and provided with a refrigerant passage (26) communicating with the outside, the material is extruded while a fore end (3) of the extruded material (1) is closed, and the inside of the hollow part (2) is set in a negative pressure state. Thus, a refrigerant (C) is sucked from the opening part (28) of the refrigerant passage (26) into the hollow part (2), and the outside refrigerant (C) is sucked into the refrigerant passage (26). COPYRIGHT: (C)2010,JPO&INPIT