Title:
EXTRA FINE STEEL WIRE FAVORABLE FOR FATIGUE CHARACTERISTIC AND MANUFACTURE THEREFOR
Document Type and Number:
Japanese Patent JP3579562
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To promote the fatigue characteristic of extra fine steel wire by making the ratio of circumferential length of the part of Fe exposed on the surface of extra fine steel wire to the whole circumference of the wire be ≤a specidied % by turning the continuously arranged dies.
SOLUTION: In the extra fine steel wire with tensile strength ≥3000MPa manufactured by drawing through dies after brass plated, the continuously arranged dies are rotated at 0.3r≤R≤r (r: drawing velocity, m/min; R: rotary velocity of dies, rpm) and the ratio of circumferential length of the part of Fe exposed on the surface of extra fine steel wire to the whole circumference of the wire is to be ≤20%. For example, brass plated steel wire, Cu, Zn electroplated, is subjected to extra fine drawing up to 0.20 or 0.30mm by wet type lubricating drawing. Cu and Zn for plating are set in that Cu:Zn=70:30 by weight and the plated thickness after drawing is about 0.1μm. The last ten stages of dies are rotatable type.
Inventors:
Masashi Sasaki
Hitoshi Tashiro
Hitoshi Tashiro
Application Number:
JP1297397A
Publication Date:
October 20, 2004
Filing Date:
January 27, 1997
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
B21C1/00; B21C1/04; B21C3/12; C21D8/06; C22C38/00; D02G3/48; D07B1/06; (IPC1-7): B21C1/00; B21C1/04; B21C3/12; C21D8/06; C22C38/00; D07B1/06
Domestic Patent References:
| JP7308707A | ||||
| JP5195458A | ||||
| JP8291369A | ||||
| JP7011594A | ||||
| JP8260368A |
Attorney, Agent or Firm:
Takashi Ishida
Kazuyuki Nishidate
Toshio Toda
Masaya Nishiyama
Kazuyuki Nishidate
Toshio Toda
Masaya Nishiyama