PORTHOLE DIE AND METHOD FOR REMOVING DISCARD IN EXTRUDING PROCESS

PROBLEM TO BE SOLVED: To provide a porthole die having a port aperture group consisting of a plurality of port apertures and a bridge, which can prevent a clearance inside the port aperture accompanying the cutting of a discard section from being generated, and can avoid crimping defects when connec...

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Bibliographische Detailangaben
Hauptverfasser:	KAERIYAMA HIDEJI, TSUTSUI TOSHIMITSU, YAMANAKA MASAKI
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 provide a porthole die having a port aperture group consisting of a plurality of port apertures and a bridge, which can prevent a clearance inside the port aperture accompanying the cutting of a discard section from being generated, and can avoid crimping defects when connected. SOLUTION: In the rear surface 26 of the porthole die 1, a recessed section 27 having the same or bigger bore diameter against the external diameter of the port aperture group is provided so as to surround the port aperture group in the inner circumferential surface and in the front or rear direction of the porthole die 1, the rear surface 24a of the bridge 24 is situated in the forward side against the position of the rear surface 26 of the porthole die. And the discard section D is cut and removed along the rear surface 26 of the porthole die.