DICE FOR COLD DRAWING OF PIPE

DICE FOR COLD DRAWING OF PIPE

PROBLEM TO BE SOLVED: To provide a dice for cold drawing of a pipe, which enables the drawing to be performed without causing cracks.SOLUTION: In a dice 1 for cold drawing, a bearing diameter and a tip diameter of the dice satisfy the following expression (1), and an external radius working ratio r/...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: KURODA KOICHI, OKUI TATSUYA, UGAWA YUSUKE
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 dice for cold drawing of a pipe, which enables the drawing to be performed without causing cracks.SOLUTION: In a dice 1 for cold drawing, a bearing diameter and a tip diameter of the dice satisfy the following expression (1), and an external radius working ratio r/L of immediately before the bearing satisfies the following expression (2), where r is an external radius working amount defined by (internal diameter of the dice in 5 mm position immediately before the bearing - a bearing diameter)/2 (mm), and L is a distance between the bearing and an external radius working amount set portion (for example, 5 mm). The expressions are: 0.80