JP3509253B2 - Induction heating device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating device for heating and annealing a plate seam weld portion of a thin plate line.

[0002]

2. Description of the Related Art In a thin plate line, a thin plate hoop material is unwound one after another on the entrance side, and the rear end of the unwound thin plate and the leading end of the next hoop material are welded by laser welding or the like. A continuous hoop material that is connected by multi-point spot welding. FIG. 5 shows the entire structure of the thin plate line. When the hoop material is supplied from the coil 1 to the apparatus and reaches the post-heating apparatus 2, the ends of the hoop material are welded and annealed, and then the heat treatment apparatus 3 is used. And is wound up by the winding side coil 4. Here, in the post-heating device 2,
Since the end of the hoop material is welded and the welded connection part is easily broken as it is, 70
It is annealed at 0 ° C to 800 ° C. 6 and 7
Shows a conventional example of the post-heating device, FIG. 6 shows an example by multi-point spot welding, and FIG. 7 shows an example by laser welding.

FIG. 6 shows a cross section of the post-heating device in the width direction. An upper conductor 11 and a lower conductor 12 for induction heating are mounted on a mounting plate 10 so as to sandwich an insulator 13. An iron core 14 is arranged around the upper conductor 11. Also, the upper conductor 11 and the lower conductor 1
On both sides of 2, the lower pedestal 15 which is an insulating material and the upper pedestal 16 which is on the lower pedestal 15 and is fixed to the mounting plate 10 by bolts together with the lower pedestal 15 are provided. Also,
A pair of upper and lower clampers 18 are arranged on both sides of the apparatus so that the work 17 is fixedly positioned on the upper receiving table 16. Figure 6
In the above example, induction heating is performed on the connecting portion of the work 17 that is multi-point spot welded.

However, in the structure shown in FIG. 6, the upper pedestal 16 is made of a non-magnetic metal such as SUS, Bs, C.
Even if u has a large capacity, it is overheated by induction due to a high magnetic field, which causes a problem that the heating efficiency of the work 17 to be originally heated is significantly reduced. For example, the efficiency of 50% is reduced to 25%. Things happen. For this reason, it is conceivable that the upper pedestal 16 is made of a non-metal material. In this case, the upper pedestal 16 does not overheat, but there is a problem that the lower clamper 18 is an iron product and is likely to overheat. Further, there is also a problem that there is no means for preventing dust and the like due to welding, and the insulator 13 is burnt out, for example.

FIG. 7 also shows a post-heating device similar to that shown in FIG.
In FIG. 7, the laser beam welding is performed by the end face butting of the work 17, and in addition to the problems such as the decrease in efficiency and overheating or the burnout of the insulator 13 shown in FIG. When using a wire welding rod for heating the laser beam, it is difficult to match the laser beam extinction with the wire feed speed at the end of welding, and if the wire is sent out even after the laser beam extinction Wire 1
9 contacts as shown in FIG. 7, causing damage to the upper conductor 11 and trouble in the control circuit.

In view of the above problems, the present invention relates to an induction heating device which improves heating efficiency, prevents overheating of a clamper or the like, prevents burnout of an insulator due to dust, and prevents contact of wires. For the purpose of provision.

[0007]

The present invention which achieves the above object is characterized by the following constitution. (1) Weld the ends of the work and burn it by induction heating.
A blunt post-heating device, in which a conductive portion composed of a lower conductor and an upper conductor is provided on a mounting plate, a lower pedestal and an upper pedestal are provided on both sides of the conductive portion, and the above-mentioned conductive portion is covered to cover the conductive portion. It is characterized by having a post-heating device provided with a protective plate between the upper pedestals on both sides. (2) The lower cradle is a heat-resistant insulator, the upper cradle is a non-ferrous metal, and the protective plate is a heat-resistant insulator. (3) At least one of the upper cradle and the lower cradle is provided with a water cooling pipe. (4) The lower pedestal is formed so as to surround the conductive portion and serves as a support for the protective plate, and the upper pedestal is provided outside the upper portion of the lower pedestal.

[0008]

The lower pedestal, the upper pedestal, and the heat-proof insulating protective plate surround the inductor, and the lower pedestal is made of a heat-resistant insulating material. The upper pedestal is made of non-ferrous metal and is provided with a cooling pipe if necessary.

[0009]

EXAMPLES Examples of the present invention will now be described with reference to FIGS. In addition, in FIGS. 1 to 4, FIGS.
The same parts as those in FIG. FIG. 3 shows the structure of an inductor which is a conductive part for induction heating in an embodiment of the present invention. The inductor forms one loop, and includes an upper conductor 11 on the work 17 side and a lower conductor 12 on the lower side. It may be connected to the high frequency power supply 20. 6 and 7 which are conventional examples.
3 and the configurations shown in FIGS. 1 and 2 show cross sections along the flow of the work 17 in FIG.

FIG. 1 shows a first embodiment of the present invention.
A lower conductor 12, an insulator 13, an iron core 14, and an upper conductor 11 are provided on the insulating plate 10a on the mounting plate 10. On the other hand,
On both sides of the upper and lower conductors 11 and 12 on the mounting plate 10,
The lower pedestal 1 which is on the pressing plate 21 and the insulating bush 22
5 and an upper pedestal 16 are provided, and the pressing plate 21, the lower pedestal 15 and the upper pedestal 16 are fixed by bolts. In this case, the lower pedestal 15 is made of, for example, an insulating material and surrounds the conductive portion to form a support for the protective plate 23 that covers the upper conductor 11 and the iron core 14.
The upper pedestal 16 is made of, for example, non-ferrous metal and serves as a retainer for the protective plate 23. This protection plate 23
Is a heat resistant insulating plate such as laminated mica or asbestos, and the lower pedestal 15 is also made of a heat resistant material. The upper surface of the upper pedestal 16 is a sliding surface of the work 17, and clamps with the upper clamper 18.
Filling material 24 such as silicon rubber is filled so as to fill the lower conductor 12 and the insulating material 13 between the lower pedestals 15. An air purging device (not shown) is provided on the protective plate 23 for removing scale and the like by blowing air.

As described above, in the present embodiment, the heating of the upper pedestal 16 can be reduced by the structure of the lower pedestal 15 and the upper pedestal 16, the arrangement of the protective plate 23, and the filling 24, and the heat generated by the induction heating and the work 17 can be reduced. Can be collected in a protective plate 2
The shielding by 3 makes it possible to eliminate dust and scale and prevent contact of wires, thereby extending the life of the inductor and improving the operating rate.

FIG. 2 shows a second embodiment of the present invention. In FIG. 2, 10 is a mounting plate, 10a is an insulating plate, 11 is an upper conductor, 12 is a lower conductor, 13 is an insulator, 14 is an iron core, 23 is a protective plate, 15 is a lower pedestal made of an insulator, and 16 is An upper pedestal 17 made of non-ferrous metal for preventing wear is a work. Further, a water cooling pipe 25 is connected to the upper pedestal 16 and the lower pedestal 15 to prevent overheating of the upper pedestal 16 due to leakage flux. Further, the lower pedestal 15 is preferably a glass laminated resin molded product or the like having high mechanical strength and good insulation, and prevents loss due to a large leakage flux generated in the upper conductor 11 and the iron core 14. Further, the upper pedestal 16 also has a role of holding the work 17 horizontally,
The gap between the upper conductor 11 and the work 17 is made uniform to eliminate uneven heating temperature. Since the upper pedestal 16 and the lower pedestal 15 are fixed by bolts, they can be easily attached and detached, and convenience for maintenance can be achieved.

The protective plate 23, which is a heat-resistant insulator, is placed on the upper conductor 11 of the inductor and fixed at the hooked portion of the upper pedestal 16. As a result, the upper conductor 11 of the inductor
Will be surrounded by the lower pedestal 15, the upper pedestal 16, and the protective plate 23, so that it is possible to prevent dust from entering the conductive part, prevent insulation deterioration, and prevent wire contact during laser beam welding. . In addition, accumulation of dust and the like can be prevented on the protective plate 23 by air purging.

FIG. 4 is a schematic perspective view of the post-heating device, showing a state in which the conductive portion is enclosed in the example shown in FIGS. That is, the lower pedestal 15, the upper pedestal 16, and the protective plate 2
The structure is surrounded by 3, and both side portions of the work 17 in the width direction are closed.

Also in the second embodiment, since the upper pedestal 16 is made of non-ferrous metal and is cooled, it is not burned by the heating temperature, and neither the protective plate 23 nor the lower pedestal 15 is burned. Further, since the magnetic shield plate is formed by the upper and lower pedestals, heating of the clamper by the leakage flux is reduced, and overheat and heat loss of the clamper are reduced. By using an insulator for the lower pedestal, it became possible to prevent loss due to leakage flux without reducing heating power.

[0016]

As described above, according to the present invention, since the conductor is surrounded by the pedestal and the protective plate, the contact of dust and wires is eliminated, and the pedestal is made of non-ferrous metal or insulating material. As a result, leakage flux prevents heating and magnetic shielding reduces heating to the clamper for efficient heating of the work. Also, positioning of the work by the upper pedestal provides uniform heating temperature. .

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is a sectional view of a second embodiment of the present invention.

FIG. 3 is a principle diagram of induction heating.

FIG. 4 is a schematic perspective view.

FIG. 5 is a schematic view of the entire line.

FIG. 6 is a sectional view of a conventional example.

FIG. 7 is a sectional view of another conventional example.

[Explanation of symbols]

2 Post heating device 11 Upper conductor 12 Lower conductor 14 iron core 15 Lower cradle 16 Upper cradle 17 work 18 clamper 23 Protective plate

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Claims (4)

(57) [Claims] 1. Induction heating while welding the end of a work
A post-heating device that is annealed by means of: a mounting plate, which is provided with a conductive portion including a lower conductor and an upper conductor, and a lower pedestal and an upper pedestal are provided on both sides of the conductive portion so as to cover the conductive portion. An induction heating device having a post-heating device having a protective plate between the upper pedestals on both sides. 2. The induction heating device according to claim 1, wherein the lower pedestal is a heat-resistant insulating material, the upper pedestal is a non-ferrous metal, and the protective plate is a heat-resistant insulating material. 3. The induction heating device according to claim 1, wherein at least one of the upper cradle and the lower cradle is provided with a water cooling pipe. 4. The induction heating apparatus according to claim 1, wherein the lower pedestal is formed so as to surround the conductive portion and serves as a support for the protective plate, and the upper pedestal is provided outside the upper portion of the lower pedestal.