Double-taper steel wire and continuous heat treating method...

Details Double-taper steel wire and continuous heat treating method... Double-taper steel wire and continuous heat treating method...

2006-03-14

2006-03-14

Yee, Deborah (Department: 1742)

Metal treatment

Stock

Ferrous

C148S595000, C148S576000, C148S511000

Reexamination Certificate

active

07011720

ABSTRACT:
A double tapered steel wire (S) is evenly heat treated over the entire length thereof. The wire (S) has its constant-diameter straight portion (21, 24) disposed between its opposite end tapered portions (22, 23) each tapered down to its reduced-diameter outer end. In heat treatments, a diameter of the wire (S) is continuously detected by a detection means (3, 6), so that the amount of energy of induction heating applied to the wire (S) is controlled by a control unit (12) in a manner such that the amount of the energy is proportional to a wire diameter of the wire (S) having been detected, whereby heat applied to the wire (S) varies over the entire length of the wire (S). As a result, the wire (S) is quenched and tempered over its entire length in a manner such that the wire (S) thus heat treated has its small-diameter portions (24) and its large-diameter portion (21) differ from each other in tensile strength.

REFERENCES:
patent: 4842818 (1989-06-01), Kato et al.
patent: 6035686 (2000-03-01), Muhr et al.
patent: 57-70043 (1982-04-01), None
patent: 61-35556 (1986-10-01), None
patent: 3-37989 (1991-02-01), None
patent: 3-189036 (1991-08-01), None
patent: 2001-347301 (2001-12-01), None
patent: 2002-282982 (2002-10-01), None
patent: 2002-285231 (2002-10-01), None
English abstract of Japanese patent 360056417, Sato, Kazuo et al., Apr. 2, 1985.

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