JP2877873B2 - Electromagnetic induction heating equipment for long metal materials - Google Patents

Description

The present invention relates to an electromagnetic induction heating device for a long metal material,
More specifically, a plurality of sets of two induction heating coils are arranged along the longitudinal direction of the path of the long metal material fed in the length direction, and even if the long metal material has an irregular cross section, it is uniform. TECHNICAL FIELD The present invention relates to an electromagnetic induction heating device for a long metal material that can be heated to a low temperature.

[Conventional technology]

Conventionally, high-frequency induction heating has been used as a method of heating a long metal material that is continuously fed in the length direction while the hoop material is roll-formed. That is, when the material to be heated (conductor) is placed at the center of the solenoid coil connected to the high frequency power supply, the material to be heated (conductor) is heated by Joule heat generated by the eddy current generated in the material to be heated (conductor). This is the heating method used.

[Problems to be solved by the invention]

The conventional high-frequency induction heating method has the following problems. That is, (1) It is effective when the material to be heated is a magnetic material, but when the material to be heated is a non-magnetic material such as stainless steel or aluminum, the material hardly generates heat and is not useful for heating.

(2) Since the object to be heated passes through the pipe around which the induction coil is wound, for example, when the adhesive applied to the surface of the metal material is dried and baked, the contained solvent is volatilized. Hard to do.

(3) Since only the surface of the object to be heated becomes high temperature in a short time, it may not be able to be carried out depending on the purpose of heating.

(4) It is difficult to control temperature by high-frequency oscillation control.

An object of the present invention is to solve the above-mentioned problem, and furthermore, a material having an irregular cross-sectional shape, a so-called profile,
An object of the present invention is to provide an electromagnetic induction heating device that can be applied to a long metal material fed in the length direction.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a pair of induction heating coils for generating magnetic flux in a direction crossing the passage on both sides of a passage of a long metal material fed in a longitudinal direction. A plurality of sets of induction heating coils are provided along the longitudinal direction of the passage, and each set of the induction heating coil pairs is configured to be rotatable around the passage of the long metal material for each set.

[Embodiment and operation]

The heating device of the present invention applies electromagnetic induction heating by high frequency, and uses a pair of coils opposed to each other with a body to be heated interposed therebetween.

FIG. 3 is a diagram for explaining the principle of electromagnetic induction heating of the present invention. The figure shows an example in which the object to be heated 3 is a strip-shaped long metal material, and a pair of two coils 2.2 are symmetrically positioned with respect to the object to be heated 3 by passing a high-frequency current through the coil. In this case, the magnetic field lines (arrows a) generated when the heater 3 is set are perpendicular to the surface of the object 3 to be heated.

In this state, when a high-frequency current is passed through the two coils 2 and 2 by the high-frequency power supply 4, the lines of magnetic force pass alternately perpendicularly to the surface of the object 3, so that This is a so-called transverse heating method in which an eddy current loss and a hysteresis loss occur and the body to be heated 3 generates heat.

Then, by moving the heated body 3 in the length direction as shown by an arrow b in FIG. 3, the heated body 3 can be continuously heated.

The high-frequency current passing through the electromagnetic induction heating coils 2 is 100 Hz to 450 KHz generally used for induction heating.
Can be applied. In particular, 10 to 100 KHz is suitably used. As the high-frequency power supply, a power supply generally used for induction heating, such as MG, thyristor inverter, transistor inverter, and vacuum tube oscillator can be applied.

The object to be heated of the heating device of the present invention is a metal material. The metal material is not limited to a magnetic material, and may be a non-magnetic material such as stainless steel or aluminum.

Furthermore, the heating device of the present invention is characterized in that it can be applied regardless of the cross-sectional shape of the object to be heated. That is, it is possible to uniformly heat even a long metal material having a more complicated cross-sectional shape as well as a case where the object to be heated is a column or a band plate. This can be achieved by installing a plurality of sets of two induction heating coils along the longitudinal direction of the object to be heated and rotatably supporting each set of coils around the object to be heated in each set.

As shown in FIG. 4, a plurality of the coil sets 2 are arranged along the longitudinal direction of the body 3 to be heated, and each coil set 2
-It is configured so that each 2 can be turned 360 ° independently.

Each set of coils 2.2 is formed so that the magnetic flux passes perpendicularly to the respective surfaces of the object to be heated 3 having an irregular cross section moving in the length direction (arrow b). The axial direction can be adjusted arbitrarily.

By doing so, the magnetic flux effectively passes through each surface of the object 3 to be heated, and the electromagnetic induction heating is performed uniformly over the entire object 3 to be heated. The number of coil sets to be used can be arbitrarily selected from two or more according to the cross-sectional shape of the long metal material to be heated, the purpose of heating, and the like. For example, it is preferable to install 5 to 10 sets of coils in advance.

FIG. 1 is a perspective view showing an example of a specific configuration of the electromagnetic induction heating device for a long metal material of the present invention. FIG. 2 shows the first
It is an expansion cross-sectional side view of a figure.

The electromagnetic induction heating apparatus 1 includes a plurality of fixed wall plates 6 erected at substantially equal intervals facing each other in the front-rear direction.
.6 a plurality of support rods 7 supporting each other in parallel
Book) make up the framework. The support rods 7 are located at equal intervals on the same circumference on the surface of the fixed wall plate 6.

Along with opposing surfaces of the fixed wall plates 6 before and after the position where the induction heating coils 2 are arranged, there are provided rotatable disks 5 which are inscribed in the support rods 7 and are rotatable. The center of the disk 5 and the fixed wall plate 6 are hollowed out in a circular shape so that the object to be heated 3 passes in the length direction.

A pair of induction heating coils 2.2 are symmetrically arranged on both sides of the passage of the heated object 3 between the front and rear fixed wall plates 6, 6 and mounted and fixed on the base plate 8, respectively. Have been. Both ends of the base plate 8 are fixed to the front and rear disks 5.5.

Therefore, when the disks 5 are turned, the set of two induction heating coils 2 rotates around the passage of the object 3 to be heated. A rolling wheel 9 is fitted in a portion of the support rod 7 where the disk 5 contacts.

The induction heating coils 2 are provided in accordance with the material, the shape, and the purpose of heating of the object to be heated 3 such as in each section divided forward and backward by the fixed wall plate 6, or as shown in FIG. To choose. Also, with the size of the induction heating coil 2,
The selection is made according to the state of the object to be heated 3.

The electromagnetic induction heating device of the present invention is particularly effective when continuously heating a long metal material while moving it in its length direction, and its application range is wide. For example, when a synthetic resin molding layer is continuously applied to the surface of a long metal material having an irregular cross-sectional shape, it is effective to heat and dry the adhesive applied to the metal material.

FIG. 5 is a schematic explanatory view of an example in which the electromagnetic induction heating device of the present invention is applied to apply and dry an adhesive to the long metal material.

A metal strip or long metal material 10 wound in a hoop shape is fed out and continuously formed into a predetermined cross-sectional shape by a roll forming machine 11, and then the surface is formed by an adhesive applying machine 12 (for example, a roll coater). Is supplied to the electromagnetic induction heating device 1 according to the present invention as the object to be heated 3.

The molded long metal material from which the adhesive is dried immediately enters a synthetic resin extrusion molding machine (crosshead die type) 13 as a core material, and a synthetic resin molding layer is formed on the surface, and the required length is sequentially formed. It is cut into products.

〔The invention's effect〕

The electromagnetic induction heating device of the present invention has the following effects because it has the above-described configuration.

1. Even if the object to be heated is a non-magnetic metal material such as aluminum or stainless steel, it can be easily heated.

2. Even if the object to be heated is a long metal material with a so-called profile having a specially shaped cross section, the entire material can be uniformly heated.

3. Therefore, when the adhesive or the paint applied to the surface of the object to be dried is dried, no defect due to local overheating occurs.

4. Since the heating of the object to be heated can be performed in an open state (the object to be heated is not placed at the center of the cylindrical coil), the volatilization of the solvent during the heating and drying of the adhesive or paint described in the preceding section is good. It is.

[Brief description of the drawings]

FIG. 1 is a perspective view of an electromagnetic induction heating apparatus for a long metal material according to the present invention, FIG. 2 is an enlarged cross-sectional view of FIG. 1, and FIG. 3 is a perspective view for explaining the principle of electromagnetic induction heating. FIG. 4 is a perspective view showing an example of the arrangement of a plurality of sets of induction heating coils, and FIG.
FIG. 1 is an explanatory view showing an adhesive coating and drying apparatus in which the heating device of the present invention is implemented. 1 ... electromagnetic induction heating device, 2 ... induction heating coil, 3 ...
… Heated object (long metal material), 4 …… High frequency power supply, 5…
... Coil mounting disk, 6 ... Fixed wall plate, 7 ... Support rod,
8 ... Base plate, 9 ... Roller wheel, 10 ... Hoop-shaped long metal material, 11 ... Roll forming machine, 12 ... Adhesive coating machine, 13 ...
Extrusion molding machine.

Claims (1)

(57) [Claims] 1. A pair of induction heating coils for generating a magnetic flux in a direction crossing a passage are provided on both sides of a passage of a long metal material fed in a longitudinal direction along a longitudinal direction of the passage. An electromagnetic induction heating apparatus for a long metal material, wherein a plurality of sets of induction heating coil pairs are provided so as to be rotatable around a path of the long metal material for each set.