Heating coil and heat treatment apparatus

Patent metadata

Field	Value
Publication number	US-10708984-B2
Application number	US-201314434443-A
Country	US
Kind code	B2
Filing date	Oct 11, 2013
Priority date	Oct 12, 2012
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

In preferred embodiments, a heating coil is provided that includes at least a set of heating conductors, one of which is arranged at a side of a work and the other one is arranged at an opposite side of the work. In addition, a plurality of connecting conductors are provided to connect an end of one of the heating conductors with an end of the other heating conductor, wherein each of the heating conductors is connected with at least two connecting conductors. The connecting conductors extend from an end of each of the heating conductor in a different direction from each other. In the preferred embodiments, the heating coil has a simple structure that enables an even heat treatment to a work in a width direction.

First claim

The invention claimed is:

1. A heating coil, comprising: at least a set of heating conductors, including a first heating conductor configured to extend lengthwise along a first side of an elongated work with a first conductive surface facing the first side of the work and a second heating conductor configured to extend lengthwise along a second side of the work opposite to said first side with a second conductive surface facing the second side of the work; and
a connecting conductor forming a loop, including a first connecting conductor portion that connects to in a first direction which is a longitudinal direction of the work and extends across one end of the first heating conductor that is perpendicular to the first side of the work and, a second connecting conductor portion that connects to in the first direction and extends across one end of the second heating conductor that is perpendicular to the second side of the work, wherein
the first connecting conductor portion extends across the entire width of the one end of the first heating conductor in a direction parallel to the one end of the first heating conductor and extends further in said direction parallel to the end of the first heating conductor in upper and lower directions to upper and lower connecting portions of the connecting conductor, and wherein said second connecting conductor portion extends across the entire width of the one end of the second heating in a direction parallel to the one end of the second heating conductor and extends further in said direction parallel to the end of the second heating conductor in upper and lower directions to the upper and lower connecting portions of the connecting conductor, and wherein
the other end of the first heating conductor is connected to one of a positive electrode and a negative electrode of a power supply, and the other end of the second heating conductor is connected to the other of the positive electrode and the negative electrode of the power supply, and wherein
said first and second heating conductors each extend further upstream in said longitudinal direction along said first and second sides of said work, respectively, than said connecting conductor.

2. The heating coil according to claim 1 , wherein each of the heating conductors faces the work partially, including at least the end connected with the connecting conductor.

3. The heating coil according to claim 2 , wherein the connecting conductor is symmetrically arranged about the work.

4. The heating coil according to claim 1 , wherein the connecting conductor is symmetrically arranged about the work.

5. The heating coil according to claim 1 ,
wherein the work is a long member extending in one direction,
wherein at least the first heating conductor and the second heating conductor partially face the work and are arranged in parallel to each other, and
wherein the two connecting conductor portions are symmetrically arranged about the work.

6. The heating coil according to claim 1 , wherein a cross-sectional area of conduction is greater at the connection between the first connecting conductor portion that connects to the end of the first heating conductor than at a narrowest portion of the first heating conductor, and a cross-sectional area of conduction is greater at the connection between the second connecting conductor portion that connects to the end of the second heating conductor than at a narrowest portion of the second heating conductor.

7. The heating coil according to claim 1 , wherein the first connecting conductor portion connects to the end of the first heating conductor in a manner that conduction occurs through the entire end of the first heating conductor to said first connecting conductor portion, and the second connecting conductor portion connects to the end of the second heating conductor in a manner that conduction occurs through the entire end of the second heating conductor to said second connecting conductor portion.

8. The heating coil according to claim 1 , wherein
the first connecting conductor portion extends across the entire end of the first heating conductor in the direction parallel to the end of the first heating conductor and wherein said second connecting conductor portion extends across the entire end of the second heating conductor in the direction parallel to the end of the second heating conductor.

9. A heat treatment apparatus, comprising:
the heating coil according to claim 1 ;
a feeder that moves the work relative to the heating coil; and
the power supply connected to a second end of the first heating conductor opposite to said end of the first heating conductor and to a second end of the second heating conductor opposite to said end of the second heating conductor.

10. The heat treatment apparatus according to claim 9 , wherein the work moves at a predetermined speed in one direction during heating.

11. A heat treatment apparatus, comprising:
the heating coil according to claim 2 ;
a feeder that moves the work relative to the heating coil; and
the power supply connected to an end of the first heating conductor opposite to said end of the first heating conductor and to an end of the second heating conductor opposite to said end of the second heating conductor.

12. A heat treatment apparatus, comprising:
the heating coil according to claim 4 ;
a feeder that moves the work relative to the heating coil; and
the power supply connected to an end of the first heating conductor opposite to said end of the first heating conductor and to an end of the second heating conductor opposite to said end of the second heating conductor.

13. A heat treatment apparatus, comprising:
the heating coil according to claim 3 ;
a feeder that moves the work relative to the heating coil; and
the power supply connected to an end of the first heating conductor opposite to said end of the first heating conductor and to an end of the second heating conductor opposite to said end of the second heating conductor.

14. A heat treatment apparatus, comprising:
the heating coil according to claim 5 ;
a feeder that moves the work relative to the heating coil; and
the power supply connected to an end of the first heating conductor opposite to said end of the first heating conductor and to an end of the second heating conductor opposite to said end of the second heating conductor.

15. A heating coil, comprising:
a plurality of heating conductors disposed along each of two opposite sides so as to sandwich in a third direction an elongated work extending in a first direction and to heat a part of each of the opposite sides of the work;
a connecting conductor that connects first ends of the plurality of heating conductors along each of the opposite sides to each other,
wherein the plurality of heating conductors along each of the opposite sides includes a narrow conductor and a wide conductor, and each of the plurality of heating conductors are arranged in parallel with each other along said first direction of the work,
wherein each respective wide conductor is wider than the respective narrow conductor in a second direction perpendicular to said first direction that extends along a respective side face of the elongated work,
wherein the connecting conductor is provided in parallel and is directly in contact with first end portions of each of the wide conductors parallel to each other, and is arranged to extend from an end of each of the plurality of heating conductors, with each wide conductor provided at the respective side of the work, in different directions from each other,
wherein the third direction is orth

Assignees

• Neturen Co Ltd

Inventors

• Tanaka Yoshimasa
• Sugiyama Yutaka

Classifications

• H05B6/42

  Cooling of coils · CPC title

• H05B6/365

  using supplementary conductive or ferromagnetic pieces · CPC title

• H05B6/40 Primary

  Establishing desired heat distribution, e.g. to heat particular parts of workpieces · CPC title

• H05B6/104

  metal pieces being elongated like wires or bands · CPC title