JPH08106977A - Induction heating device of metallic wire material - Google Patents

Abstract

PURPOSE: To continuously heat a metallic wire material with high efficiency by arranging plural induction heating coils in parallel to each other, and successively inserting the metallic wire material into the respective induction heating coils. CONSTITUTION: Two induction heating coils 1 and 2 are vertically arranged so as to become parallel to each other, and electric power supply side terminals of the coils 1 and 2 are respectively connected to electric power supply 7 by wirings 8, and the other end side terminals are connected to each other. A metallic wire material 3 such as a flux containing wire changes the direction upward by a turn roller 4, and enters the coil 1, and passes upward. Next, after coming out of the coil 1, the wire material 3 is reversed by a turn roller 5, and enters the coil 2. After passing through the coil 2, it changes the direction into the horizontal direction by a turn roller 6. With this constitution, the electric power supply side terminal 7 of the coils 1 and 2 are put on the same side, and a loss of a high frequency current is reduced, and heating efficiency is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal wire induction heating apparatus for continuously heating a metal wire, and more particularly to continuous heating of a flux-cored wire or a solid wire in which a mild steel or alloy steel shell is filled with flux. The present invention relates to an induction heating device for a metal wire suitable for.

[0002]

2. Description of the Related Art An induction heating device is a device for continuously heating a metal wire material such as a flux-cored wire or a solid wire. This induction heating device is a device for inductively heating a metal wire rod which continuously passes through the coil along the coil axis by passing a high frequency current through the induction heating coil.

This conventional induction heating device has poor heating efficiency and various improvements have been made to improve the heating efficiency. For example, in Japanese Examined Patent Publication No. 5-27693, the heating efficiency is improved by devising the winding method of the induction heating coil and by additionally using electric heating.
As a result, the induction heating device described in this publication improved the heating efficiency by about 10% in the case of mild steel.

[0004]

However, although some improvement in heating efficiency is recognized by this conventional technique, it cannot be said that the heating efficiency is still sufficient in practical use.

The present invention has been made in view of the above problems, and an object thereof is to provide an induction heating device for a metal wire rod capable of continuously heating the metal wire rod with high efficiency.

[0006]

The induction heating device for a metal wire according to the present invention has a plurality of induction heating coils arranged in parallel and a wire induction device for sequentially passing the metal wire through each induction heating coil. It is characterized by

[0007]

In the present invention, a plurality of induction heating coils are arranged in parallel. Therefore, it is possible to electrically reduce the mutual distance between the power supply side terminals of the induction heating coil connected in series between the power supply terminals. Thereby, the distance between the power source and the induction heating coil can be shortened, and the energy loss from the power source (high frequency oscillator) to the induction heating coil can be significantly reduced. This significantly improves the heating efficiency.

[0008]

Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing an induction heating device according to an embodiment of the present invention. For example, two induction heating coils 1, each having a length of 10 cm to 1 m,
2 are arranged with their longitudinal directions vertical so that both ends are aligned and parallel to each other.

Turn rollers 4 and 6 are arranged at the lower ends of the induction heating coils 1 and 2, respectively, and one turn roller 5 is arranged between the upper ends thereof.

The power source side terminals of the induction heating coils 1 and 2 are connected to the power source 7 by wirings 8, respectively, and the other end side terminals of the induction heating coils 1 and 2 are connected to each other by wirings 8. As a result, the induction heating coils 1 and 2 are electrically connected in series with the power source 7.

On the other hand, the metal wire 3 such as a flux-cored wire is first turned up by the turn roller 4 into the induction heating coil 1 as shown by the arrow in the drawing, and passes through it. After this wire 3 leaves the coil 1,
It is reversed by the turn roller 5 and enters the induction heating coil 2 from its upper end. Then, the wire 3 passes through the inside of the coil 2 downward, comes out of the coil 2, and is turned horizontally by the turn roller 6. Wire 3 is the induction heating coil 1, 2
It is induction heated as it passes through. The angle at which the wire is bent is not limited to 90 ° as shown in FIG.

In this case, in this embodiment, since the induction heating coils 1 and 2 are arranged in parallel with each other and with their ends aligned, they are installed in parallel and electrically connected in series. The power supply side terminals of the two connected induction heating coils 1 and 2 are on the same side, and in the illustrated example, both are at the lower end. Therefore,
It is possible to connect a tangential wire between the power supply side terminal and the power supply 7 by a short wiring 8 of 1 m or less, for example. Therefore, the loss of high-frequency current is reduced in the wiring 8 connecting the power supply 7 and the coils 1 and 2. Therefore, the heating efficiency of the wire 3 is high.

On the other hand, in the conventional induction heating apparatus, as shown in FIG. 2, a plurality of induction heating coils 1,
2 was arranged on a straight line, and the wire 3 was passed through the coils 1 and 2 in a straight line. Therefore, the power supply 7 and the coils 1, 2
The wiring 8 for connecting to the power supply side terminal of is extremely long, and extends to several meters, for example.

The inventors of the present application have conducted various experimental studies on the cause of insufficient heating efficiency in the induction heating coils 1 and 2, and as a result, when the work types (composition, size, etc.) are the same, the induction heating power source is used. It has been found that the longer the distance between and the induction heating coil, the lower the heating efficiency. Specifically, if the induction heating coil is as long as several meters, that is, if the line speed is fast or the temperature rise is high, or if the power supply must be separated from the induction coil from a space perspective, It was found that the heating efficiency was low.

From the above knowledge, the present invention has conceived that the energy loss generated between the power source and the induction coil can be greatly reduced by bringing the high frequency input terminal and the high frequency output terminal of the induction heating coil close to each other. By actually configuring as defined in the present invention, heating efficiency improvement of 10% or more was obtained.

In the embodiment shown in FIG. 1, the high frequency induction heating coils 1 and 2 are vertically arranged side by side. Usually, a quartz tube is installed in the induction coil so that the induction heating coil and the metal wire rod which is the work are not short-circuited. However, if it is used for a long time, oil, water and foreign matter adhering to the surface of the metal wire in this quartz tube will evaporate and fall off, causing an abnormality in the induction heating device. However, when the induction heating coils are arranged in parallel vertically to the ground as in the present embodiment, oil and water are dissipated from the upper part of the quartz tube, and the foreign matter that has fallen off the metal wire drops from the lower part of the quartz tube into the quartz tube. No foreign material accumulates.

Further, as in the prior art disclosed in Japanese Examined Patent Publication No. 5-27693, when the energization heating is used together with the high frequency induction heating, that is, the high frequency voltage generated in the axial direction of the metal wire is used for the energization. When using the effect of heating together,
A mechanism for short-circuiting the metal wire is required. In the apparatus according to the present embodiment, since the turn rollers 4 and 6 are in contact with the wire rod 3 even when electric heating is also used in this way, the wire rod can be easily made by short-circuiting the rotating shafts of the turn rollers 4 and 6. Can be shorted to.

3 and 4 are schematic views showing another embodiment of the present invention. In FIG. 3, three roller groups 11 are arranged on the upper side, and four roller groups 10 are arranged on the lower side. In the upper roller group 11 and the lower roller group 10, their turn rollers are coaxially connected. Has been done. Between the upper roller group 11 and the lower roller group 10, six induction coils 12 are vertically arranged with their ends aligned.

The metal wire 3 is induction-heated by passing through the induction heating coil 12 while sequentially passing through the rollers of the lower roller group 10 and the rollers of the upper roller group 11. Also in this embodiment, since the induction heating coils 12 are arranged in parallel, the power source can be connected with a short wiring, so that the energy loss is small and the wire rod 3 can be heated with high efficiency.

FIG. 4 (a) shows two pairs of turn rollers 1 arranged vertically.
2 and 13 are arranged, and the induction heating coil 16 is arranged on the common tangent line of the rollers 12 and 13.

The wire 3 passes through the lower roller 13 on the inlet side twice, passes through the upper roller 12 on the outlet side twice, and passes through each coil 16 in the meantime.

FIG. 4B shows two turn rollers 1 on the upper side.
4 are arranged, and three turn rollers 15 are arranged below. An induction heating coil 17 is arranged between the rollers 14 and 15, and the metal wire 3 is heated by sequentially passing through the turn roller 15, the induction heating coil 17 and the turn roller 14. In the embodiment shown in FIGS. 4A and 4B, the induction heating coils 16 and 17 are arranged in parallel. Therefore, its heating efficiency is high.

FIG. 5 is a schematic view showing another embodiment of the present invention. This embodiment is an example in which a pair of induction heating coils 18 are horizontally arranged in parallel, and the metal wire 3 enters the coil 18 via the turn roller 20 and further exits from the induction heating device via the turn roller 20. Also in this embodiment, since the coils 18 are arranged in parallel, the power supply side terminal and the power supply 1
The length of the wiring 22 between the wiring 9 and the wiring 9 can be shortened, and the energy loss generated in the wiring 22 is extremely small.

FIG. 6 is a schematic view showing still another embodiment of the present invention. An induction heating coil 25 is arranged in parallel on the two common tangent lines between the upper turn roller 23 and the lower turn roller 24.

The power supply side terminal of each coil 25 is a power supply 26.
It is connected to the. The wire 3 first changes its course upward by the lower turn roller 24, reverses by the turn roller 23 and moves downward, and travels horizontally through the lower turn roller 24. During this time, the wire 3 has two induction heating coils 2
It is heated by passing through 5.

Also in this embodiment, since the two induction heating coils 25 are arranged in parallel, the energy loss in the wiring is small and the heating efficiency of the metal wire 3 is high.

In this embodiment, by short-circuiting the turn roller 23 and the turn roller 24, the high frequency voltage generated in the axial direction of the solid wire (metal wire 3) is
Electric current heating can be used together by flowing in a closed circuit formed by a solid wire between the turn rollers 23 and 24.

The short circuit between the rollers for obtaining the effect of the electric heating is not limited to that shown in FIG. 6 and can be applied to various modes. For example, in the embodiments shown in FIGS. 3 and 4, various combinations such as between the first roller and the second roller, or between the first roller and the third roller, etc. It is possible.

Next, description will be made on the result of actually high-frequency induction heating the wire rod by the apparatus of this embodiment. First, the flux-cored wire (diameter 1.
2 mm) was heated. The heating coil had a length of about 1 m, and two heating coils were arranged in parallel. The line speed of the wire 3 is 400 m / min, and the wire heating temperature is from room temperature to 1
The temperature was raised to 50 ° C. In this case, the feeder line length is 1
Since the length of the feeder wire was 4 m when the conventional coil was arranged on a straight line (FIG. 2), the heating efficiency was increased by about 10% to 36% in this example. It was

Next, the result of heating a stainless steel (JIS308; diameter 2.4 mm) solid wire using the apparatus shown in FIG. 6 will be described. The heating coil had a length of about 1 m, and two heating coils were used. The line speed was 200 m / min, and the wire heating temperature was raised from room temperature to 200 ° C. Also in this embodiment, the length of the feeder line is 1 m, which is much shorter than the conventional length of 4 m. As a result, the heating efficiency increased by 4% to 10% in this example.

[0031]

As described above, according to the present invention, since the induction heating coils are arranged in parallel, the heating efficiency of the metal wire can be remarkably increased.

[Brief description of drawings]

FIG. 1 is a schematic view showing an apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a conventional device.

FIG. 3 is a schematic view showing another embodiment of the present invention.

FIG. 4 is a schematic view showing still another embodiment of the present invention.

FIG. 5 is a schematic view showing still another embodiment of the present invention.

FIG. 6 is a schematic view showing still another embodiment of the present invention.

[Explanation of symbols]

1,12,16,17,18,25; Induction heating coil 3; Wire rods 4, 5, 6, 12, 13, 14, 15, 20, 21; Turn roller 7; Power supply

Claims (1)

[Claims] 1. An induction heating device for a metal wire rod, comprising: a plurality of induction heating coils arranged in parallel; and a wire rod guiding device for sequentially passing the metal wire rod through each induction heating coil.