Title:
DRAWING METHOD
Document Type and Number:
Japanese Patent JP3608489
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a drawing method for reducing the occurrence of bend which is caused on a wire rod, a steel bar and steel wire in the case that axially asymmetrical cutting is performed after drawing.
SOLUTION: A die satisfying that the half-angle θ(°) of the taper angle on the outlet side is 0.01≤θ≤0.5° and the ratio of the length L (mm) of the tapered part on the outlet side to the length E (mm) of a bearing part is 1≤L/E≤10 is used for the final pass of the drawing, working is performed at a working rate satisfying 0.3≤100{1-(d/D)2}≤6 and 0.10D≤E(d/D)2≤0.33 D. Where D is the diameter (mm) of a material to be worked on the inlet side of the die in the final pass of the drawing and d is the diameter (mm) of the material to be worked on the outlet side of the die.
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Inventors:
Yutaka Neishi
Watanabe Ryo
Watanabe Ryo
Application Number:
JP2000275777A
Publication Date:
January 12, 2005
Filing Date:
September 12, 2000
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
B21C3/02; (IPC1-7): B21C3/02
Domestic Patent References:
| JP62114718A | ||||
| JP11033617A | ||||
| JP1245914A | ||||
| JP7060336A | ||||
| JP6218425A |
Attorney, Agent or Firm:
Mikiji Sugioka
Michio Mori
Terutada Hogami
Michio Mori
Terutada Hogami
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