JP6991753B2 - Heating coil and heating method - Google Patents

Description

The present invention relates to a heating coil and a heating method for inducing heating a plate-shaped work.

As a heating coil used for induction heating of a plate-shaped work, a solenoid type heating coil and a transverse type heating coil are known.

The solenoid type heating coil generates an alternating magnetic field substantially parallel to the surface of the work. The induced current induced in the work by this alternating magnetic field flows so as to orbit in the cross section of the work between both ends in the width direction of the work.

On the other hand, the transverse heating coil generates an alternating magnetic field that is substantially perpendicular to the surface of the work, and the induced current induced in the work by this alternating magnetic field is applied to the surface of the work between both ends in the width direction of the work. It flows so as to go around along.

In general, due to the difference in the flow of the induced current described above, the temperature profile of the work induced and heated by the solenoid type heating coil becomes relatively uniform, while the temperature profile is induced and heated by the transverse type heating coil. In the temperature profile of the work, the temperature at both ends in the width direction of the work rises relatively.

The heating coil described in Patent Document 1 is a transverse type heating coil, and is a pair of conductors arranged along the surface of the work and across the work in the width direction of the work, and a pair of conductors. It is provided with a clamp that connects one end of the wire to each other, and a loop that serves as a current path is formed by the pair of conductors and the clamp. Then, one conductor can move with respect to the other conductor in the width direction of the work, and the length of the loop in the width direction is changed according to the width of the work.

Special Fair 7-7704 Bulletin

The shape of the work varies, and the temperature profile required for heating the work also varies. Normally, the trial production of the heating coil is repeated for each work to achieve the desired temperature profile, but the trial production is costly. In the heating coil described in Patent Document 1, the length of the loop serving as the current path can be changed according to the width of the work, but the obtained temperature profile is that of the temperature profile obtained by the transverse heating coil. It doesn't go out of the realm.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heating coil and a heating method capable of changing the temperature profile of a work.

The heating coil according to one aspect of the present invention is a heating coil that induces and heats a plate-shaped work, and includes a lead portion connected to a power source and at least one heating portion attached to the lead portion. The heating portion includes a pair of conductors extending parallel to each other and connecting one first end portion in the extending direction to each other, extending parallel to each other and having a front side conductor portion arranged along the surface of the work. One selected from the back side conductor portion arranged along the back surface of the work and the pair of conductors of the front side conductor portion including a pair of conductors to which one first end portion in the extending direction is connected to each other. The front side conductor portion and the back side conductor portion are detachably connected to the second end portion of the second conductor and the second end portion of one of the third conductors selected from the pair of conductors of the back side conductor portion. The second end of the other first conductor of the pair of conductors of the front side conductor portion, and the other fourth conductor of the pair of conductors of the back side conductor portion, which have a connecting conductor to be connected. The second end portion is detachably attached to the lead portion.

Further, the heating method according to one aspect of the present invention is a heating method in which a plate-shaped work is induced and heated by using the heating coil, which is parallel to the front surface and the back surface of the work and the heating portion of the heating coil. The work is induced and heated while the heating coil and the work are relatively swung back and forth in a direction orthogonal to the extending direction of the pair of conductors of the front side conductor portion and the back side conductor portion.

According to the present invention, it is possible to provide a heating coil and a heating method capable of changing the heating temperature profile of the work.

It is a top view of an example of a heating coil for demonstrating embodiment of this invention. It is a side view of the heating coil of FIG. It is a schematic diagram of the heating coil of FIG. It is a schematic diagram of an example of the alternating magnetic field generated by the heating coil of FIG. It is a graph of an example of the temperature profile of the work induced and heated by the heating coil of FIG. It is a top view which shows the adjustment example of the heating coil of FIG. It is a side view which shows the adjustment example of the heating coil of FIG. It is a top view of the heating coil in which the conductor of the heating part of FIG. 1 is replaced. It is a side view of the heating coil of FIG. It is a schematic diagram of the heating coil of FIG. It is a schematic diagram of an example of the alternating magnetic field generated by the heating coil of FIG. It is a graph of an example of the temperature profile of the work induced and heated by the heating coil of FIG. It is a top view of another example of a heating coil for demonstrating embodiment of this invention. It is a schematic diagram of the heating coil of FIG. It is a schematic diagram of an example of the alternating magnetic field generated by the heating coil of FIG. It is a graph of an example of the temperature profile of the work induced and heated by the heating coil of FIG. It is a schematic diagram of the heating coil in which the conductor of a part of the heating part of FIG. 13 is replaced. It is a schematic diagram of an example of the alternating magnetic field generated by the heating coil of FIG. It is a schematic diagram of another example of a heating coil for demonstrating embodiment of this invention. It is a schematic diagram of an example of the alternating magnetic field generated by the heating coil of FIG. It is a graph of an example of the temperature profile of the work induced and heated by the heating coil of FIG. It is a schematic diagram of the heating coil in which the conductor of a part of the heating part of FIG. 19 is replaced. It is a schematic diagram of an example of the alternating magnetic field generated by the heating coil of FIG. 22.

1 to 3 show an example of a heating coil for explaining an embodiment of the present invention.

The heating coil 1 shown in FIGS. 1 to 3 is a heating coil used for induction heating of the plate-shaped work W. The heating coil 1 includes a pair of lead portions 3 and 4 connected to the AC power supply 2 and a heating portion 5A attached to the pair of lead portions 3 and 4. The heating unit 5A comprises a front conductor portion 10 arranged along the surface of the work W, a back conductor portion 11 arranged along the back surface of the work W, and a front conductor portion 10 and a back conductor portion 11. It has a connecting conductor 40 to be connected.

The front conductor portion 10 includes a pair of conductors 20 and 21. The pair of conductors 20 and 21 are arranged so as to extend in the width direction of the work W. Then, among both ends of the conductor 20 in the extending direction, the first end 20a arranged on the one end Wa side in the width direction of the work W and both ends of the conductor 21 in the extending direction. It is connected to each other with the first end portion 21a arranged on the end Wa side of the work W.

The back side conductor portion 11 includes a pair of conductors 30 and 31. The pair of conductors 30 and 31 are arranged so as to extend in the width direction of the work W. Then, among the both ends of the conductor 30 in the extending direction, the first end 30a arranged on the end Wa side of the work W and the end of the work W among both ends of the conductor 31 in the extending direction. The first end portion 31a arranged on the Wa side is connected to each other.

The connecting conductor 40 is selected from a pair of conductors of one conductor selected from the pair of conductors of the front side conductor portion 10, the second end portion arranged on the end portion Wb side of the work W, and the back side conductor portion 11. One conductor is connected to the second end portion arranged on the end portion Wb side of the work W, and these two conductors are connected to each other. In the following, of the pair of conductors of the front side conductor portion 10, one conductor to which the connecting conductor 40 is connected is referred to as a second conductor, and the other conductor is referred to as a first conductor. Further, of the pair of conductors of the back side conductor portion 11, one conductor to which the connecting conductor 40 is connected is referred to as a third conductor, and the other conductor is referred to as a fourth conductor.

In this example, the connecting conductor 40 is connected to each end of the second end portion 21b of the conductor 21 of the front side conductor portion 10 and the second end portion 31b of the conductor 31 of the back side conductor portion 11, and the conductor 21 and the conductor 31 are connected to each other. Are connected. Therefore, the conductor 20 of the front side conductor portion 10 is the first conductor, the conductor 21 of the front side conductor portion 10 is the second conductor, the conductor 31 of the back side conductor portion 11 is the third conductor, and the conductor of the back side conductor portion 11 is the conductor. 30 is the fourth conductor. Then, the second end portion 20b of the first conductor 20 is attached to the lead portion 3, and the second end portion 30b of the fourth conductor 30 is attached to the lead portion 4.

The second conductor 21 of the front conductor portion 10 is formed linearly from the first end portion 21a to the second end portion 21b. The second end 20b of the first conductor 20 of the front conductor portion 10 is arranged in parallel with the second conductor 21, and the first end 20a of the first conductor 20 is arranged with respect to the second end 20b. It is bent at a substantially right angle, and the first conductor 20 is formed in a substantially L shape as a whole. The front conductor portion 10 formed by connecting the first end portion 20a of the first conductor 20 and the first end portion 21a of the second conductor 21 to each other forms a substantially U-shaped loop serving as a current path.

A tab 51 on which a slit 50 is formed is provided at the second end portion 20b of the first conductor 20 of the front conductor portion 10 attached to the lead portion 3. A bolt 52 is inserted into the slit 50, and the tab 51 is fastened to the lead portion 3 by the bolt 52, so that the first conductor 20 is detachably attached to the lead portion 3.

Further, the third conductor 31 of the back side conductor portion 11 is formed linearly from the first end portion 31a to the second end portion 31b. The second end portion 30b of the fourth conductor 30 of the back side conductor portion 11 is arranged in parallel with the third conductor 31, and the first end portion 30a of the fourth conductor 30 is relative to the second end portion 30b. It is bent at a substantially right angle, and the fourth conductor 30 is formed in a substantially L shape as a whole. The back side conductor portion 11 formed by connecting the first end portion 31a of the third conductor 31 and the first end portion 30a of the fourth conductor 30 to each other also forms a substantially U-shaped loop serving as a current path.

A tab 61 on which a slit 60 is formed is provided at the second end portion 30b of the fourth conductor 30 of the back side conductor portion 11 attached to the lead portion 4. A bolt 62 is inserted into the slit 60, and the tab 61 is fastened to the lead portion 4 by the bolt 62, so that the fourth conductor 30 is detachably attached to the lead portion 4.

The first conductor 20 of the front conductor portion 10 attached to the lead portion 3 and the third conductor 31 of the back conductor portion 11 connected to the connecting conductor 40 are arranged so as to face each other with the work W interposed therebetween. The second conductor 21 of the front conductor portion 10 connected to the connecting conductor 40 and the fourth conductor 30 of the back conductor portion 11 attached to the lead portion 4 are arranged so as to face each other with the work W interposed therebetween.

In the above positional relationship of the first conductor 20, the second conductor 21, the third conductor 31, and the fourth conductor 30, the connecting conductor 40 is formed in a substantially S shape, and the second conductor 21 of the front conductor portion 10 is the first. It is detachably connected to each end of the second end 31b of the third conductor 31 of the second conductor 21b and the back conductor portion 11, and the second conductor 21 and the third conductor 31 are detachably connected to each other.

A bolt 70 is provided at the second end 21b of the second conductor 21, and one end of the connecting conductor 40 is fastened to the second end 21b of the second conductor 21 by the bolt 70 to be connected. The conductor 40 is detachably connected to the second end portion 21b of the second conductor 21. Similarly, a bolt 71 is provided at the second end 31b of the third conductor 31, and the other end of the connecting conductor 40 is fastened to the second end 31b of the third conductor 31 by the bolt 71. The connecting conductor 40 is detachably connected to the second end portion 31b of the third conductor 31.

Further, in this example, the first end portion 20a of the first conductor 20 of the front conductor portion 10 and the first end portion 21a of the second conductor 21 are detachably connected to each other, and the first end portion 21a of the second conductor 21 is connected. The connection point in the above can be changed in the extending direction of the second conductor 21, that is, in the width direction of the work W. Then, the first conductor 20 is slidably attached to the lead portion 3 in the width direction of the work W in response to the change of the connection portion at the first end portion 21a of the second conductor 21. As a result, the length L1 of the loop as the current path formed by the front conductor portion 10 is variable in the width direction of the work W.

Specifically, a plurality of bolts (first conductor connecting portions) 53 are provided on the first end portion 21a of the second conductor 21, and the first bolt 53 selected from the plurality of bolts 53 is used for the first bolt 53. By fastening the first end portion 20a of the conductor 20 to the first end portion 21a of the second conductor 21, the first end portion 20a of the first conductor 20 and the first end portion 21a of the second conductor 21 are detached from each other. Possible to be connected to each other. Then, by changing the bolt 53 for fastening the first end portion 20a of the first conductor 20, the connection point at the first end portion 21a of the second conductor 21 is in the extending direction of the second conductor 21, that is, the work. It is changed in the width direction of W. Further, the slit 50 of the tab 51 provided in the second end portion 20b of the first conductor 20 is formed so as to extend in the extending direction of the second end portion 20b, that is, in the width direction of the work W. The first conductor 20 is slidably attached to the lead portion 3 in the width direction of the work W.

Similarly, the first end portion 31a of the third conductor 31 of the back conductor portion 11 and the first end portion 30a of the fourth conductor 30 are also detachably connected and connected at the first end portion 31a of the third conductor 31. The location can be changed in the extending direction of the third conductor 31, that is, in the width direction of the work W. Then, the fourth conductor 30 is slidably attached to the lead portion 4 in the width direction of the work W in response to the change of the connection portion at the first end portion 31a of the third conductor 31. As a result, the length L2 of the loop as the current path formed by the back conductor portion 11 becomes variable in the width direction of the work W.

Specifically, a plurality of bolts (fourth conductor connecting portions) 63 are provided at the first end portion 31a of the third conductor 31, and a fourth bolt 63 selected from the plurality of bolts 63 provides a fourth bolt. By fastening the first end portion 30a of the conductor 30 to the first end portion 31a of the third conductor 31, the first end portion 31a of the third conductor 31 and the first end portion 30a of the fourth conductor 30 are detached from each other. Possible to be connected to each other. Then, by changing the bolt 63 for fastening the first end portion 30a of the fourth conductor 30, the connection point at the first end portion 31a of the third conductor 31 is in the extending direction of the third conductor 31, that is, the work. It is changed in the width direction of W. Further, the slit 60 of the tab 61 provided in the second end portion 30b of the fourth conductor 30 is formed so as to extend in the extending direction of the second end portion 30b, that is, in the width direction of the work W. The fourth conductor 30 is attached to the lead portion 4 so as to be slidable in the width direction of the work W.

Each conductor of the first conductor 20, the second conductor 21, the third conductor 31, the fourth conductor 30, and the connecting conductor 40 is made of a tubular material made of a metal material such as copper. The inside of each conductor is a flow path through which the cooling medium flows, but in this example, since the conductors are detachably connected to each other, the flow path inside each conductor is configured independently for each conductor. Has been done. For this reason, each conductor is provided with a supply port and a discharge port (both not shown) of the cooling medium.

FIG. 4 shows an example of an alternating magnetic field generated by a heating unit 5A composed of a conductor set of a first conductor 20, a second conductor 21, a third conductor 31, a fourth conductor 30, and a connecting conductor 40. Shows an example of the temperature profile of the work W induced and heated by the alternating magnetic field of FIG. In FIG. 5, the temperature is shown in gray scale, and it is assumed that the darker the temperature, the higher the temperature.

In the above positional relationship of the first conductor 20, the second conductor 21, the third conductor 31, and the fourth conductor 30, the heating unit 5A has an alternating magnetic field Φ1 in which the magnetic flux lines intersect substantially perpendicular to the front surface and the back surface of the work W. To generate. The induced current I1 induced in the work W by the alternating magnetic field Φ1 orbits the front surface and the back surface of the work W along the first conductor 20, the second conductor 21, the third conductor 31, and the fourth conductor 30. Flow to. That is, the heating unit 5A can be said to be a transverse type heating unit. In the temperature profile of the work W induced and heated by the heating portion 5A, the temperatures of both ends Wa and Wb in the width direction are higher than the temperature of the central portion in the width direction.

The temperature profile shown in FIG. 5 is a temperature profile when the positional relationship between the heating unit 5A and the work W is fixed, but is parallel to the longitudinal direction of the work W, in other words, the front surface and the back surface of the work W, and The heating coil 1 (heating portion 5A) and the work W are relatively moved back and forth in the direction orthogonal to the extending direction of the first conductor 20, the second conductor 21, the third conductor 31, and the fourth conductor 30 of the heating portion 5A. The work W may be induced and heated while being shaken. In this case, the heating region heated by the temperature profile is expanded in the longitudinal direction of the work W according to the swing stroke.

In this example, as described above, the connection point with the first conductor 20 in the first end 21a of the second conductor 21 of the front conductor portion 10 can be changed in the width direction of the work W, and the first conductor. 20 is attached to the lead portion 3 so as to be slidable in the width direction of the work W. Similarly, the connection point of the back side conductor portion 11 with the fourth conductor 30 at the first end portion 31a of the third conductor 31 can be changed in the width direction of the work W, and the fourth conductor 30 is in the width direction of the work W. It is slidably attached to the lead portion 4. As a result, as shown in FIG. 6, the length L1 of the loop as the current path formed by the front conductor portion 10 and the length L2 of the loop as the current path formed by the back conductor portion 11 are matched with the width of the work W. The heating coil 1 can be applied to work W of various widths.

Further, as shown in FIG. 7, a fourth conductor detachably attached between the lead portion 3 and the first conductor 20 detachably attached to the lead portion 3 and / or between the lead portion 4 and the lead portion 4. By interposing the conductive spacer 12 between the conductor 30 and the conductor 30, the distance G between the front side conductor portion 10 and the back side conductor portion 11 can be changed according to the thickness of the work W, and the front side conductor portion 10 and the front side conductor portion 10 can be changed. By using the connecting conductor 40 having a length corresponding to the distance G from the back side conductor portion 11, the heating coil 1 can be applied to the work W having various thicknesses.

8 to 10 show a heating coil 1 in which the conductor of the heating portion is replaced.

The heating portion 5B of the heating coil 1 shown in FIGS. 8 to 10 includes a front conductor portion 10 including a pair of conductors 20 and 21, a back conductor portion 11 including a pair of conductors 32 and 33, and a front conductor portion 10 and a back side. A connecting conductor 41 for connecting the conductor portion 11 is provided. That is, the heating unit 5B shown in FIGS. 7 and 8 has a pair of conductors constituting the back side conductor portion 11, the front side conductor portion 10 and the back side conductor portion 11 with respect to the heating portion 5A shown in FIGS. 1 and 2. The connecting conductor that connects and is replaced.

The pair of conductors 32, 33 of the back side conductor portion 11 are arranged so as to extend in the width direction of the work. Then, of the both ends of the conductor 32 in the extending direction, the first end 32a arranged on the end Wa side of the work, and the both ends of the conductor 33 in the extending direction, the end Wa side of the work. The first end portion 33a arranged in the above is detachably connected to each other.

The connecting conductor 41 is detachably connected to the second end portion 21b of the conductor 21 of the front side conductor portion 10 and the second end portion 33b of the conductor 33 of the back side conductor portion 11, and the conductor 21 and the conductor 33 can be separated from each other. Is connected to. Therefore, in the heating portion 5B, the conductor 20 of the front side conductor portion 10 is the first conductor, the conductor 21 of the front side conductor portion 10 is the second conductor, and the conductor 33 of the back side conductor portion 11 is the third conductor. The conductor 32 of the back side conductor portion 11 is the fourth conductor. The second end portion 20b of the first conductor 20 is detachably attached to the lead portion 3, and the second end portion 32b of the fourth conductor 32 is detachably attached to the lead portion 4.

The third conductor 33 of the back side conductor portion 11 is formed linearly from the first end portion 33a to the second end portion 33b. The second end portion 32b of the fourth conductor 32 of the back side conductor portion 11 is arranged in parallel with the third conductor 33, and the first end portion 32a of the fourth conductor portion 32 is arranged with respect to the second end portion 32b. It is bent at a substantially right angle, and the fourth conductor 32 is formed in a substantially L shape as a whole. The back side conductor portion 11 formed by connecting the first end portion 33a of the third conductor 33 and the first end portion 32a of the fourth conductor 32 to each other forms a substantially U-shaped loop serving as a current path.

The first conductor 20 of the front conductor portion 10 attached to the lead portion 3 and the fourth conductor 32 of the back conductor portion 11 attached to the lead portion 4 are arranged so as to face each other with the work W interposed therebetween. The second conductor 21 of the front conductor portion 10 connected to the connecting conductor 41 and the third conductor 33 of the back conductor portion 11 connected to the connecting conductor 41 are arranged so as to face each other with the work W interposed therebetween.

In the above positional relationship of the first conductor 20, the second conductor 21, the third conductor 33, and the fourth conductor 32, the connecting conductor 41 is formed in a straight line, and the second end of the second conductor 21 of the front conductor portion 10 is formed. The portion 21b and the second end portion 33b of the third conductor 33 of the back side conductor portion 11 are connected.

FIG. 11 shows an example of an alternating magnetic field generated by a heating unit 5B composed of a conductor set of a first conductor 20, a second conductor 21, a third conductor 33, a fourth conductor 32, and a connecting conductor 41. Shows an example of the temperature profile of the work W induced and heated by the alternating magnetic field of FIG.

In the above positional relationship of the first conductor 20, the second conductor 21, the third conductor 33, and the fourth conductor 32, in the heating portion 5B, the magnetic flux lines intersect substantially perpendicular to the cross section perpendicular to the longitudinal direction of the work W. An alternating magnetic field Φ2 is generated, and the induced current I2 induced in the work W by the alternating magnetic field Φ2 is a cross section of the work W along the first conductor 20, the second conductor 21, the third conductor 33, and the fourth conductor 32. It flows like going around. That is, the heating unit 5B can be said to be a solenoid-type heating unit. The temperature profile of the work W induced and heated by the heating unit 5B is more uniform in the width direction of the work W than the temperature profile shown in FIG.

The temperature profile shown in FIG. 12 is a temperature profile when the positional relationship between the heating portion 5B and the work W is fixed, but the heating coil 1 (heating portion 5B) and the work W are relative to each other in the longitudinal direction of the work W. The work W may be induced and heated while swinging back and forth. In this case, the heating region heated by the temperature profile is expanded in the longitudinal direction of the work W according to the swing stroke.

Also in the heating unit 5B, the length L1 of the loop as the current path formed by the front conductor portion 10 and the current path formed by the back conductor portion 11 are the same as in the heating portion 5A shown in FIGS. 1 to 3. The length L2 of the loop can be changed according to the width of the work W, and the distance G between the front side conductor portion 10 and the back side conductor portion 11 is set by using the conductive spacer 12 (see FIG. 7). It can be changed according to the thickness of the work W.

In this way, one of the second conductors 21 selected from the pair of conductors of the front conductor portion 10 forming a substantially U-shaped loop as a current path along the surface of the work W, and along the back surface of the work W. A third conductor 31 (33) selected from a pair of conductors of the back side conductor portion 11 forming a substantially U-shaped loop as a current path is separably connected by a connecting conductor 40 (41). Further, the other first conductor 20 of the pair of conductors of the front side conductor portion 10 is detachably attached to the lead portion 3, and the other fourth conductor 30 (32) of the pair of conductors of the back side conductor portion 11 is detachably attached. By attaching to the lead portion 4 as much as possible, the configuration of the heating portion can be easily changed between the transverse type heating unit 5A and the solenoid type heating unit 5B. As a result, the temperature profile of the work W can be changed, and the prototype cost of the heating coil that achieves the desired temperature profile can be reduced.

13 and 14 show other examples of heating coils for explaining embodiments of the present invention.

The heating coil 101 shown in FIGS. 13 and 14 is a heating coil used for induction heating of the plate-shaped work W. The heating coil 101 includes a pair of lead portions 103 and 104 connected to the AC power supply 2, and a plurality of heating portions attached to the pair of lead portions 103 and 104. In the illustrated example, the four heating portions 5A are provided. The work W is arranged at intervals in the longitudinal direction and is attached to the lead portions 103 and 104, respectively. That is, the positional relationship between the first conductor, the second conductor, the third conductor, and the fourth conductor of each of the four heating portions is the same among these four heating portions.

In this example, the lead portion 103 is provided with a plurality of tap holes 55 at predetermined pitches in the longitudinal direction of the work W. Similarly, the lead portion 104 is provided with a plurality of tap holes 65 at predetermined pitches in the longitudinal direction of the work W. A bolt 52 for fastening the first conductor 20 of each heating portion 5A to the lead portion 103 is fixed to an appropriate tap hole 55 selected from a plurality of tap holes 55, and the fourth conductor 30 of each heating portion 5A is fixed. By fixing the bolt 62 to be fastened to the lead portion 104 to an appropriate tap hole 65 selected from the plurality of tap holes 65, each heating portion 5A can be positioned variably at a predetermined pitch, and the lead portion 103, Attached to 104.

FIG. 15 shows an example of an alternating magnetic field generated by a heating coil 101 in which four heating portions 5A are arranged in the longitudinal direction of the work W, and FIG. 16 shows a temperature profile of the work W induced and heated by the alternating magnetic field of FIG. An example is shown.

As described above, each heating unit 5A generates an alternating magnetic field Φ1 in which magnetic flux lines intersect substantially perpendicular to the front surface and the back surface of the work W, and the induced current induced in the work W by this alternating magnetic field Φ1 is each heating. It flows around the front surface and the back surface of the work W along the first conductor 20, the second conductor 21, the third conductor 31, and the fourth conductor 30 of the portion 5A.

Here, each of the four heating units is a heating unit 5A, and the positional relationship between the first conductor, the second conductor, the third conductor, and the fourth conductor of each of the two adjacent heating units 5A is the heating of these two parts. It is the same between departments. Therefore, in the region Wc of the work W located between the two adjacent heating portions 5A, the induced current induced by the alternating magnetic field Φ1 of one heating portion 5A and the alternating magnetic field Φ1 of the other heating portion 5A are induced. At any point in time, the induced currents that are generated cancel each other out in opposite directions. Therefore, the work W is induced and heated only in the local region facing each heating portion 5A.

FIG. 17 shows a heating coil 101 in which the conductor of a part of the heating portion is replaced.

In the heating coil 101 shown in FIG. 17, four heating portions are arranged at intervals in the longitudinal direction of the work W and are attached to the lead portions 103 and 104, respectively. The heating portions 5C are arranged alternately.

The heating portion 5C includes a front conductor portion 10 including a pair of conductors 22 and 23, a back conductor portion 11 including a pair of conductors 32 and 33, and a connecting conductor 42 connecting the front conductor portion 10 and the back conductor portion 11. To prepare for. That is, the heating unit 5C connects the heating unit 5A with the pair of conductors constituting the front side conductor portion 10, the pair of conductors constituting the back side conductor portion 11, and the front side conductor portion 10 and the back side conductor portion 11. The connecting conductor is replaced.

The pair of conductors 22 and 23 of the front conductor portion 10 are arranged so as to extend in the width direction of the work. Then, of the both ends of the conductor 22 in the extending direction, the first end 22a arranged on the end Wa side of the work, and the both ends of the conductor 23 in the extending direction, the end Wa side of the work. The first end portion 23a arranged in the above is detachably connected to each other.

The pair of conductors 32, 33 of the back side conductor portion 11 are arranged so as to extend in the width direction of the work. Then, of the both ends of the conductor 32 in the extending direction, the first end 32a arranged on the end Wa side of the work, and the both ends of the conductor 33 in the extending direction, the end Wa side of the work. The first end portion 33a arranged in the above is detachably connected to each other.

The connecting conductor 42 is detachably connected to the second end portion 23b of the conductor 23 of the front side conductor portion 10 and the second end portion 33b of the conductor 33 of the back side conductor portion 11, and the conductor 23 and the conductor 33 can be separated from each other. Is connected to. Therefore, in the heating portion 5B, the conductor 22 of the front side conductor portion 10 is the first conductor, the conductor 23 of the front side conductor portion 10 is the second conductor, and the conductor 33 of the back side conductor portion 11 is the third conductor. The conductor 32 of the back side conductor portion 11 is the fourth conductor. The second end portion 22b of the first conductor 22 is detachably attached to the lead portion 103, and the second end portion 32b of the fourth conductor 32 is detachably attached to the lead portion 104.

The second conductor 23 of the front conductor portion 10 is formed linearly from the first end portion 23a to the second end portion 23b. The second end 22b of the first conductor 22 of the front conductor portion 10 is arranged in parallel with the second conductor 23, and the first end portion 22a of the first conductor 22 is arranged with respect to the second end portion 22b. It is bent at a substantially right angle, and the first conductor 22 is formed in a substantially L shape as a whole. The front conductor portion 10 formed by connecting the first end portion 22a of the first conductor 22 and the first end portion 23a of the second conductor 23 to each other forms a substantially U-shaped loop serving as a current path.

The third conductor 33 of the back side conductor portion 11 is formed linearly from the first end portion 33a to the second end portion 33b. The second end portion 32b of the fourth conductor 32 of the back side conductor portion 11 is arranged in parallel with the third conductor 33, and the first end portion 32a of the fourth conductor portion 32 is arranged with respect to the second end portion 32b. It is bent at a substantially right angle, and the fourth conductor 32 is formed in a substantially L shape as a whole. The back side conductor portion 11 formed by connecting the first end portion 33a of the third conductor 33 and the first end portion 32a of the fourth conductor 32 to each other forms a substantially U-shaped loop serving as a current path.

The first conductor 22 of the front conductor portion 10 attached to the lead portion 103 and the third conductor 33 of the back conductor portion 11 connected to the connecting conductor 42 are arranged so as to face each other with the work W interposed therebetween. The second conductor 23 of the front conductor portion 10 connected to the connecting conductor 42 and the fourth conductor 32 of the back conductor portion 11 attached to the lead portion 104 are arranged so as to face each other with the work W interposed therebetween.

In the above positional relationship of the first conductor 22, the second conductor 23, the third conductor 33, and the fourth conductor 32, the connecting conductor 42 is formed in a substantially S shape, and the second conductor 23 of the front conductor portion 10 is the second conductor 23. It is detachably connected to each end of the second end 33b of the third conductor 33 of the second conductor 23b and the back conductor portion 11, and the second conductor 23 and the third conductor 33 are detachably connected to each other.

Further, the positional relationship between the first conductor 22, the second conductor 23, the third conductor 33, and the fourth conductor 32 of the heating portion 5C is such that the first conductor 20, the second conductor 21, and the third conductor 31 of the adjacent heating portions 5A are arranged. , It is symmetrical with respect to the positional relationship of the fourth conductor 30. In other words, the current path of the heating unit 5A and the current path of the heating unit 5C are symmetrical.

FIG. 18 shows an example of an alternating magnetic field generated by a heating coil 101 in which the heating portions 5A and the heating portions 5C are alternately arranged in the longitudinal direction of the work W.

As described above, the heating unit 5A generates an alternating magnetic field Φ1 in which the magnetic flux lines intersect substantially perpendicular to the front surface and the back surface of the work W, and the induced current induced in the work W by the alternating magnetic field Φ1 is the induced current in each heating unit. It flows around the front surface and the back surface of the work W along the first conductor 20, the second conductor 21, the third conductor 31, and the fourth conductor 30 of 5A.

The heating unit 5C also generates an alternating magnetic field Φ3 in which the magnetic flux lines intersect substantially perpendicular to the front surface and the back surface of the work W, and the induced current induced in the work W by the alternating magnetic field Φ3 is the first of the heating unit 5C. It flows around the front surface and the back surface of the work W along the conductor 22, the second conductor 23, the third conductor 33, and the fourth conductor 32.

Further, since the positional relationship between the first conductor, the second conductor, the third conductor, and the fourth conductor of the adjacent heating portions 5A and the heating portions 5C, respectively, is symmetrical between these two heating portions, the two adjacent heating portions are adjacent to each other. In the region Wc of the work W located between the two heating units 5A and 5C, the induced current induced by the alternating magnetic field Φ1 of the heating unit 5A and the induced current induced by the alternating magnetic field Φ3 of the heating unit 5C are arbitrary. At this point, they are in the same direction and strengthen each other.

Since the heating units 5A and 5C are attached to the lead units 103 and 104 in a variable position at a predetermined pitch, the alternating magnetic field Φ1 of each heating unit 5A and the alternating magnetic field Φ3 of the heating unit 5C are combined. By approaching the distance between the two adjacent heating units 5A and 5C, a sufficient induced current also flows in the region Wc of the work W located between the two adjacent heating units 5A and 5C.

As a result, in the work W, the local region facing each heating portion 5A and 5C is induced and heated, and the region Wc located between the two adjacent heating portions 5A and 5C is also induced and heated. A temperature profile different from the temperature profile shown in 16 is obtained.

Regarding the heating coil 101 shown in FIGS. 13 and 14, and the heating coil 101 shown in FIG. 17, the work W is guided while the heating coil 101 and the work W are relatively swung back and forth in the longitudinal direction of the work W. It may be heated.

FIG. 19 shows another example of a heating coil for explaining an embodiment of the present invention.

The heating coil 201 shown in FIG. 19 is a heating coil used for induction heating of the plate-shaped work W. The heating coil 201 includes a pair of lead portions 203 and 204 connected to the AC power supply 2 and a plurality of heating portions attached to the pair of lead portions 203 and 204. In the illustrated example, the four heating portions 5B are provided. The work W is arranged at intervals in the longitudinal direction and is attached to the lead portions 203 and 204, respectively. That is, the positional relationship between the first conductor, the second conductor, the third conductor, and the fourth conductor of each of the four heating portions is the same among these four heating portions. In this example, each heating unit 5B is attached to the lead units 203 and 204 in a variable position at a predetermined pitch.

FIG. 20 shows an example of an alternating magnetic field generated by a heating coil 201 in which four heating portions 5B are arranged in the longitudinal direction of the work W, and FIG. 21 shows a temperature profile of the work W induced and heated by the alternating magnetic field of FIG. An example is shown.

As described above, each heating unit 5B generates an alternating magnetic field Φ2 in which the magnetic flux lines intersect substantially perpendicular to the cross section perpendicular to the longitudinal direction of the work W, and the induced current induced in the work W by this alternating magnetic field Φ2 is generated. , The first conductor 20, the second conductor 21, the third conductor 33, and the fourth conductor 32 flow so as to orbit the cross section of the work W.

Here, each of the four heating units is the heating unit 5B, and the positional relationship between the first conductor, the second conductor, the third conductor, and the fourth conductor of each of the two adjacent heating units 5B is the heating of these two parts. It is the same between departments. Therefore, in the region Wc of the work W located between the two adjacent heating portions 5B, the induced current induced by the alternating magnetic field Φ2 of one heating portion 5B and the alternating magnetic field Φ2 of the other heating portion 5B are induced. At any point in time, the induced currents that are generated are opposite to each other and cancel each other out. Therefore, the work W is induced and heated only in the local region facing each heating portion 5B.

FIG. 22 shows a heating coil 201 in which the conductor of a part of the heating portion is replaced.

In the heating coil 201 shown in FIG. 22, four heating portions are arranged at intervals in the longitudinal direction of the work W and are attached to the lead portions 203 and 204, respectively. The heating portions 5D are arranged alternately.

The heating portion 5D includes a front conductor portion 10 including a pair of conductors 22 and 23, a back conductor portion 11 including a pair of conductors 30 and 31, and a connecting conductor 41 connecting the front conductor portion 10 and the back conductor portion 11. To prepare for. That is, in the heating portion 5D, the pair of conductors constituting the front side conductor portion 10 and the pair of conductors constituting the back side conductor portion 11 are replaced with respect to the heating portion 5B.

The pair of conductors 22 and 23 of the front conductor portion 10 are arranged so as to extend in the width direction of the work. Then, of the both ends of the conductor 22 in the extending direction, the first end 22a arranged on the end Wa side of the work, and the both ends of the conductor 23 in the extending direction, the end Wa side of the work. The first end portion 23a arranged in the above is detachably connected to each other.

The pair of conductors 30 and 31 of the back side conductor portion 11 are arranged so as to extend in the width direction of the work. Then, among the both ends of the conductor 30 in the extending direction, the first end 30a arranged on the end Wa side of the work, and the both ends of the conductor 31 in the extending direction, the end Wa side of the work. The first end portion 31a arranged in the above is detachably connected to each other.

The connecting conductor 41 is detachably connected to the second end portion 23b of the conductor 23 of the front side conductor portion 10 and the second end portion 31b of the conductor 31 of the back side conductor portion 11, and the conductor 23 and the conductor 31 can be separated from each other. Is connected to. Therefore, in the heating portion 5D, the conductor 22 of the front side conductor portion 10 is the first conductor, the conductor 23 of the front side conductor portion 10 is the second conductor, the conductor 31 of the back side conductor portion 11 is the third conductor, and the back side. The conductor 30 of the conductor portion 11 is the fourth conductor. The second end portion 22b of the first conductor 22 is detachably attached to the lead portion 203, and the second end portion 30b of the fourth conductor 30 is detachably attached to the lead portion 204.

The first conductor 22 of the front conductor portion 10 attached to the lead portion 203 and the fourth conductor 30 of the back conductor portion 11 attached to the lead portion 204 are arranged so as to face each other with the work W interposed therebetween. The second conductor 23 of the front conductor portion 10 connected to the connecting conductor 41 and the third conductor 31 of the back conductor portion 11 connected to the connecting conductor 41 are arranged so as to face each other with the work W interposed therebetween.

In the above positional relationship of the first conductor 22, the second conductor 23, the third conductor 31, and the fourth conductor 30, the connecting conductor 41 is formed in a straight line, and the second end of the second conductor 23 of the front conductor portion 10 is formed. The portion 23b and the second end portion 31b of the third conductor 31 of the back side conductor portion 11 are connected to each other.

Further, the positional relationship between the first conductor 22, the second conductor 23, the third conductor 31, and the fourth conductor 30 of the heating portion 5D is such that the first conductor 20, the second conductor 21, and the third conductor 33 of the adjacent heating portions 5B are arranged. , It is symmetrical with respect to the positional relationship of the fourth conductor 32. In other words, the current path of the heating unit 5B and the current path of the heating unit 5D are symmetrical.

FIG. 23 shows an example of an alternating magnetic field generated by a heating coil 201 in which the heating unit 5B and the heating unit 5D are alternately arranged in the longitudinal direction of the work W.

As described above, the heating unit 5B generates an alternating magnetic field Φ2 in which the magnetic flux lines intersect substantially perpendicular to the cross section perpendicular to the longitudinal direction of the work W, and the induced current induced in the work W by the alternating magnetic field Φ2 is generated. It flows around the cross section of the work W along the first conductor 20, the second conductor 21, the third conductor 33, and the fourth conductor 32.

The heating unit 5D also generates an alternating magnetic field Φ4 in which the magnetic flux lines intersect substantially perpendicular to the cross section perpendicular to the longitudinal direction of the work W, and the induced current induced in the work W by the alternating magnetic field Φ4 is the first conductor. 22, the second conductor 23, the third conductor 31, and the fourth conductor 30 flow so as to orbit the cross section of the work W.

Further, since the positional relationship between the first conductor, the second conductor, the third conductor, and the fourth conductor of the adjacent heating portions 5B and the heating portions 5D is symmetrical between the two heating portions, the adjacent heating portions 2 In the region Wc of the work W located between the two heating units 5B and 5D, the induced current induced by the alternating magnetic field Φ2 of the heating unit 5B and the induced current induced by the alternating magnetic field Φ4 of the heating unit 5D are arbitrary. At this point, they are in the same direction and strengthen each other.

Since the heating units 5B and 5D are attached to the lead units 203 and 204 in a variable position at a predetermined pitch, the alternating magnetic field Φ2 of the heating unit 5B and the alternating magnetic field Φ4 of the heating unit 5D are combined. In addition, by narrowing the distance between the two adjacent heating units 5B and 5D, a sufficient induced current can be passed through the region Wc of the work W located between the two adjacent heating units 5B and 5D. ..

As a result, in the work W, the local region facing each heating portion 5B and 5D is induced and heated, and the region Wc located between the two adjacent heating portions 5B and 5D is also induced and heated. A temperature profile different from the temperature profile shown in 21 is obtained.

Regarding the heating coil 201 shown in FIG. 19 and the heating coil 201 shown in FIG. 22, the work W is induced and heated while the heating coil 201 and the work W are relatively swung back and forth in the longitudinal direction of the work W. May be good.

In this way, even if the methods (transverse method or solenoid method) of the two adjacent heating units are the same, the first conductor, the second conductor, the third conductor, and the fourth conductor of each heating unit are used. The temperature profile of the work W can be changed depending on whether the positional relationship of the conductors is the same or symmetrical between these two heating portions, and the trial cost of the heating coil that achieves the desired temperature profile can be reduced.

The heating coil 101 uses the transverse type heating units 5A and 5B, and the heating coil 201 uses the solenoid type heating units 5C and 5D. However, in one heating coil, the transverse type heating units 5A and 5B are used. And the solenoid type heating units 5C and 5D may be mixed, whereby more diverse temperature profiles of the work W can be obtained.

1 Heating coil 2 AC power supply 3 Lead part 4 Lead part 5A Heating part 5B Heating part 5C Heating part 5D Heating part 10 Front side conductor part 11 Back side conductor part 12 Spacer 20-23 Conductor 30-33 Conductor 40-42 Connecting conductor 50 Slit 51 Tab 52 Bolt 53 Bolt (1st conductor connection)
55 Tap hole 60 Slit 61 Tab 62 Bolt 63 Bolt (4th conductor connection)
65 Tap hole 70 Bolt 71 Bolt 101 Heating coil 201 Heating coil W Work Φ1 to Φ4 Alternating magnetic field

Claims (10)

A heating coil that induces and heats a plate-shaped work.
The lead part connected to the power supply and
At least one heating part attached to the lead part, and
Equipped with
The heating part is
A front-side conductor portion that includes a pair of conductors that extend parallel to each other and connect one of the first ends in the extending direction to each other and is arranged along the surface of the work.
A backside conductor portion that includes a pair of conductors that extend parallel to each other and connect one of the first ends in the extending direction to each other and is arranged along the back surface of the work.
Detachable to the second end of one second conductor selected from the pair of conductors on the front side conductor and to the second end of one third conductor selected from the pair of conductors on the back side conductor portion. A connecting conductor that is connected and connects the front side conductor portion and the back side conductor portion,
Have,
The second end of the other first conductor of the pair of conductors on the front side and the second end of the fourth conductor of the other of the pair of conductors on the back side conductor are detachably attached. Attached to the lead part ,
The first end of the first conductor and the first end of the second conductor are detachably connected, and the connection point at the first end of the second conductor is the extending direction of the second conductor. The first conductor is slidably attached to the lead portion in the extending direction of the second conductor in response to a change in the connection point at the first end portion of the second conductor. Be,
The first end of the third conductor and the first end of the fourth conductor are detachably connected, and the connection point at the first end of the third conductor is the extending direction of the third conductor. The fourth conductor is slidably attached to the lead portion in the extending direction of the third conductor in response to the change of the connection point at the first end portion of the third conductor. Have been
Heating coil. The heating coil according to claim 1.
The front conductor portion is a heating coil further including a conductive spacer that is detachably fixed between the second end portion of the first conductor and the lead portion. The heating coil according to claim 1 or 2.
The back side conductor portion is a heating coil further including a conductive spacer that is detachably fixed between the second end portion and the lead portion of the fourth conductor. The heating coil according to any one of claims 1 to 3.
A plurality of first conductor connecting portions are provided at the first end portion of the second conductor at intervals in the extending direction of the second conductor.
The first end portion of the first conductor is detachably connected to one first conductor connection portion selected from the plurality of first conductor connection portions.
The second end portion of the first conductor is a heating coil that is slidably attached to the lead portion in the extending direction of the first conductor. The heating coil according to any one of claims 1 to 4.
A plurality of fourth conductor connecting portions are provided at the first end portion of the third conductor at intervals in the extending direction of the third conductor.
The first end portion of the fourth conductor is detachably connected to one fourth conductor connection portion selected from the plurality of fourth conductor connection portions.
The second end portion of the fourth conductor is a heating coil that is slidably attached to the lead portion in the extending direction of the fourth conductor. The heating coil according to any one of claims 1 to 5.
Equipped with a plurality of the heating parts
The plurality of heating portions are arranged at intervals in a direction orthogonal to the extending direction of the conductor, and are attached to the lead portions. The heating coil according to claim 6.
The plurality of heating portions are heating coils attached to the lead portions in a position variable at a predetermined pitch in the orthogonal direction. The heating coil according to claim 6 or 7.
A heating coil in which the positional relationship between the first conductor, the second conductor, the third conductor, and the fourth conductor of each of the plurality of heating portions is the same among the plurality of heating portions. The heating coil according to claim 6 or 7.
The positional relationship between the first conductor, the second conductor, the third conductor, and the fourth conductor of each of the two adjacent heating portions among the plurality of heating portions is symmetrical between the two heating portions. Heating coil. A heating method for inducing heating a plate-shaped work using the heating coil according to any one of claims 1 to 9.
The heating coil and the work are placed parallel to the front surface and the back surface of the work and in a direction orthogonal to the extending direction of the pair of conductors of the front side conductor part and the back side conductor part of the heating part of the heating coil. A heating method in which the work is induced and heated while being relatively swung back and forth.

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