JP2570969Y2 - High frequency induction heating coil - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency induction heating coil which is used for quenching the surface of a straight work such as a shaft and has a long life.

[0002]

2. Description of the Related Art A conventional high-frequency induction heating coil for heating a work W in the form of a straight rod such as a drive shaft or an axle shaft will be described with reference to FIG. This kind of high-frequency induction heating coil 700 for heating a straight rod-shaped workpiece W that is a rotationally symmetric body is configured as a so-called semi-open type. That is, a pair of first and second arc-shaped conductors 710 and 750 having a substantially quarter-arc shape connected to the high-frequency power supply 500 and a pair of first and second arc-shaped conductors 710 and 750 connected to the first and second arc-shaped conductors 750 and 750, respectively. The first and second linear conductors 720 and 740 have a semi-circular conductor 730 connecting the ends of the first and second linear conductors 720 and 740 to each other.

The quenching of the work W is performed by aligning the axis of the work W with the axis of the high-frequency induction heating coil 700.
While rotating about the axis, a high-frequency current from the high-frequency power supply 500 is supplied to the high-frequency induction heating coil 700 for a predetermined time to heat the work W, and then the work W is rapidly cooled.

[0004]

However, when a large number of works W are to be quenched, it is necessary to shorten the induction heating time of each work W in order to shorten the quenching work time. For this reason, a large current is applied to the high-frequency induction heating coil 700, so that the temperature of the coil becomes extremely high. As a result, while heating the work W repeatedly, the high-frequency induction heating coil 700 is deteriorated and the life is shortened.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a high-frequency induction heating coil having little deterioration and a long life.

[0006]

A high-frequency induction heating coil according to the present invention has a semi-open inner coil and a semi-open outer coil connected in series to the inner coil. A semi-open type high-frequency induction heating coil for heating a straight rod-shaped work such as
An inner first arc-shaped conductor, an inner first linear conductor connected to the other end of the inner first arc-shaped conductor, an inner semicircular conductor connected to the other end of the inner first linear conductor, An inner second linear conductor connected to the other end of the inner semicircular conductor;
An inner second arc-shaped conductor connected to the other end of the inner second linear conductor; the outer coil includes an outer first arc-shaped conductor having one end connected to the inner second arc-shaped conductor; An outer first linear conductor connected to the other end of the first arc-shaped conductor, an outer semicircular conductor connected to the other end of the outer first linear conductor, and an outer semicircular conductor connected to the other end of the outer semicircular conductor; An outer second linear conductor to be connected, and an outer second arc-shaped conductor connected to the other end of the outer second linear conductor; a first power supply conductor on the inner first arc-shaped conductor; The outer second
A second power supply conductor is connected to each of the arc-shaped conductors, and the inner first linear conductor, the inner second linear conductor, the outer first linear conductor, and the outer second linear conductor are connected to the axis of the workpiece. Parallel, the inner first linear conductor and the outer first linear conductor are arranged on one side of the work, and the inner second linear conductor and the outer second linear conductor are arranged on the other side of the work, respectively. Each linear conductor directly faces the peripheral surface of the work, and each arc-shaped conductor and each semi-circular conductor are configured to directly face the peripheral surface of the work.

FIG. 1 is a schematic perspective view of a high-frequency induction heating coil according to an embodiment of the present invention, and FIG. 2 is a diagram showing a relationship between a high-frequency induction heating coil and a work according to the embodiment of the present invention. FIG. 1A is a front view, and FIG. 1B is a side view.

As shown in FIG. 1, a high-frequency induction heating coil 300 according to an embodiment of the present invention is a semi-open type high-frequency induction heating coil for heating a straight rod-shaped work W such as a shaft. Inner coil 310, and a half open type outer coil 32 connected in series to the inner coil 310.
0.

The inner coil 310 is a combination of a square pipe made of a good conductive metal having a substantially rectangular cross section.
A substantially quarter-arc inner first arc conductor 311, an inner first linear conductor 312 connected to the other end of the inner first arc conductor 311, and an inner first linear conductor 312 connected to the other end of the inner first linear conductor 312. The inner semi-circular conductor 313 to be connected, the inner second linear conductor 314 connected to the other end of the inner semi-circular conductor 313, and the almost second end connected to the other end of the inner second linear conductor 314 And an inner second arc-shaped conductor 315 having a 円 arc shape.

The inner first arc-shaped conductor 311 is formed according to an arc slightly larger than the outer diameter of the work W in the form of a straight rod, and one end thereof extends outward as a portion 311A to which the first power supply conductor 410 is connected. Have been.

The inner first linear conductor 312 connected to the other end of the inner first arc-shaped conductor 311 in a direction orthogonal to the inner first arc-shaped conductor 311 is connected to the axis L of the straight rod-shaped workpiece W. Are arranged in parallel to

Further, such an inner first linear conductor 31
An inner semi-arc-shaped conductor 313 connected to the other end of 2 in a direction orthogonal to the inner first linear conductor 312 is disposed in the circumferential direction of the workpiece W.

Furthermore, such an inner semicircular conductor 31
An inner second linear conductor 314 connected to the other end of 3 in a direction orthogonal to the inner semicircular conductor 313 is provided along the peripheral surface WA of the work W having a straight rod shape.
It is set parallel to the axis L of the work W. Further, the inner second linear conductor 314 is connected to the axis L of the workpiece W.
Are disposed at positions symmetrical with the inner first linear conductor 312 with respect to the axis of symmetry.

The inner second arc-shaped conductor 315 connected to the other end of the inner second linear conductor 314 in a direction orthogonal to the inner second linear conductor 314 is connected to the inner first linear conductor 314.
Like the arc-shaped conductor 311, it is formed according to an arc slightly larger than the outer diameter of the work W in the shape of a straight bar. The inner second arc-shaped conductor 315 is disposed on the same plane as the inner first arc-shaped conductor 311.

That is, as shown in FIG. 1, a step 316 extending upward (upward in FIG. 1) is formed at the other end of the inner second arc-shaped conductor 315.
Thus, it is connected to the outer first arc-shaped conductor 321 of the outer coil 320. Therefore, the outer first arc-shaped conductor 32
1 will be located above the inner first arc-shaped conductor 311.

On the other hand, the outer coil 320 is
10. Similar to FIG. 10, a square pipe made of a good conductive metal having a substantially rectangular cross section is combined, and the outer first arc conductor 321 having a substantially quarter-arc shape and the outer first arc conductor 32 are formed.
1, an outer first linear conductor 322 connected to the other end of the first outer linear straight conductor 322, an outer semicircular conductor 323 connected to the other end of the outer first linear conductor 322, and the other end of the outer semicircular conductor 323. , And an outer second arc-shaped conductor 325 having a substantially quarter-arc shape connected to the other end of the outer second linear conductor 324.

The outer first arc-shaped conductor 321 is connected to the inner first
It is formed as an arc equivalent to the arc constituting the arc-shaped conductor 311. The outer first arc-shaped conductor 321 is approximately 1 /
It is formed in a four-arc shape, and is located above the inner first arc-shaped conductor 311 by the stepped portion 316.

Further, such an outer first arc-shaped conductor 321
Is connected in the direction orthogonal to the outer first arc-shaped conductor 321, and is disposed in parallel with the axis L of the work W having a straight rod shape. In addition, the outer first linear conductor 322 directly faces the peripheral surface WA of the work W.

Furthermore, such an outer first linear conductor 3
An outer semi-circular conductor 323 connected to the other end of the outer first linear conductor 322 in a direction orthogonal to the outer first linear conductor 322 is formed in accordance with the same arc as the arc forming the outer first arc-shaped conductor 121. I have. Therefore, as shown in FIG. 1, the outer semi-circular conductor 323 is
(Below in FIG. 1).

The outer second linear conductor 324 connected to the other end of the outer semi-arc conductor 323 in a direction orthogonal to the outer semi-arc conductor 323 is connected to the axis L of the work W in a straight rod shape. Are arranged in parallel to Moreover, the outer second linear conductor 324 directly faces the peripheral surface WA of the work W.

The outer second arc-shaped conductor 325 connected to the other end of the outer second linear conductor 324 in a direction orthogonal to the outer second linear conductor 324 is connected to the outer first linear conductor 324.
It is formed according to the same arc as the arc-shaped conductor 321. The other end of the outer second arc-shaped conductor 325 extends outward as a portion 325A to which the second power supply conductor 420 is connected.

Accordingly, each of the linear conductors 312, 314, 3
22 and 324 not only directly face the peripheral surface WA of the work W, but also each of the arc-shaped conductors 311, 315, 321,.
325 and the semicircular conductors 313 and 323 are disposed so as to directly face the peripheral surface WA of the work W.

That is, since the coil for heating the peripheral surface WA of the work W has two turns, the inductance of the coil itself is larger than that of a conventional high-frequency induction heating coil of this type, and the voltage of the high-frequency power supply 500 is reduced. If they are the same, the high-frequency current flowing through the coil will be small. For this reason, since the conduction current can be reduced as compared with the conventional one-turn high-frequency induction heating coil, the degree of deterioration of the high-frequency induction heating coil 300 due to heat generation can be reduced. The magnetic flux generated by the high-frequency induction heating coil 300 is substantially proportional to the product of the high-frequency current and the number of turns of the high-frequency induction heating coil.
Even when the current of 0 is reduced, the amount of heat generated in the work W is substantially the same as the amount of heat generated by the conventional high-frequency induction heating coil, and the work W can be heated to a predetermined level.

Next, the operation of the high-frequency induction heating coil 300 configured as described above will be described. The inner first linear conductor 312 and the outer first linear conductor 322 of the high-frequency induction heating coil 300, the inner second linear conductor 314, and the outer second linear conductor 314
The work W is set between the work W and the linear conductor 324. At this time, the axis L of the work W and the central axis of the high-frequency induction heating coil 300 are made to coincide. A high-frequency current is supplied from the high-frequency power supply 500, and the work W is rotated about the axis L by a rotating jig (not shown).

The high-frequency current is represented by an arrow as shown in FIG.
Inner first arc-shaped conductor 311 → Inner first linear conductor 312 →
Inner semicircular conductor 313 → inner second linear conductor 314 →
Inner second arc-shaped conductor 315 → stepped portion 316 → outer first arc-shaped conductor 321 → outer first linear conductor 322 → outer semi-circular conductor 323 → outer second linear conductor 324 → outer second arc-shaped conductor 325. Or in the reverse order. This allows
The peripheral surface WA of the work W is heated.

When the energization of the high-frequency current for a predetermined time is completed, a quenching liquid is sprayed onto the work W from a jacket (not shown) or the work W is immersed in a cooling liquid to complete the quenching.

The peripheral surface WA of the work W has four linear conductors, namely, an inner first linear conductor 312, an inner second linear conductor 314, an outer first linear conductor 322, and an outer second linear conductor 322.
Induction current due to the high-frequency current flowing through the linear conductor 324 and four arc-shaped conductors, that is, the inner first arc-shaped conductor 31
1, inner second arcuate conductor 315, outer first arcuate conductor 321
Heat is induced by the high-frequency current flowing through the outer second arc-shaped conductor 325 and the two semi-arc-shaped conductors, namely, the inner semi-arc-shaped conductor 313 and the outer semi-arc-shaped conductor 323.

[0028]

[Effect of the Invention] The high-frequency induction heating coil according to the present invention is:
It has a semi-open type inner coil and a semi-open type outer coil connected in series to the inner coil, and is a semi-open type high frequency induction heating coil for heating a straight rod-shaped work such as a shaft. The inner coil includes an inner first arc-shaped conductor, an inner first linear conductor connected to the other end of the inner first arc-shaped conductor, and an inner first linear conductor connected to the other end of the inner first linear conductor. A semi-circular conductor, an inner second linear conductor connected to the other end of the inner semi-circular conductor, and an inner second arc conductor connected to the other end of the inner second linear conductor The outer coil has an outer first arc conductor having one end connected to the inner second arc conductor, an outer first linear conductor connected to the other end of the outer first arc conductor, and an outer first linear conductor connected to the other end of the outer first arc conductor. An outer semicircular conductor connected to the other end of the linear conductor,
An outer second linear conductor connected to the other end of the outer semi-circular conductor; and an outer second arc conductor connected to the other end of the outer second linear conductor. The arc-shaped conductor has a first power supply conductor, and the outer second arc-shaped conductor has a second power supply conductor.
A power supply conductor is connected to each of the inner first linear conductor, the inner second linear conductor, the outer first linear conductor, and the outer second linear conductor. The first linear conductor and the outer first linear conductor are disposed on one side of the work, and the inner second linear conductor and the outer second linear conductor are disposed on the other side of the work, respectively. Each of the arc-shaped conductors and each of the semi-circular conductors directly face the peripheral surface of the work.

That is, this high frequency induction heating coil
Since the number of turns is two, the inductance of the coil itself is larger than that of a conventional one-turn high-frequency induction heating coil of this type, and if the voltage of the power supply is the same, the high-frequency current flowing through the coil becomes smaller. For this reason, since the energizing current can be reduced as compared with the conventional one-turn high-frequency induction heating coil, the degree of deterioration due to heat generation of the high-frequency induction heating coil can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a high-frequency induction heating coil according to an embodiment of the present invention.

FIGS. 2A and 2B are diagrams showing a relationship between a high-frequency induction heating coil and a work according to the embodiment of the present invention, wherein FIG. 2A is a front view and FIG. 2B is a side view.

FIG. 3 is a schematic perspective view of a conventional high-frequency induction heating coil of this type.

[Explanation of symbols]

 300 High-frequency induction heating coil 310 Inner coil 311 Inner first arc-shaped conductor 312 Inner first linear conductor 313 Inner semi-circular conductor 314 Inner second linear conductor 315 Inner second arc-shaped conductor 320 Outer coil 311 Outer first arc-shaped conductor 312 Outer first linear conductor 313 Outer semicircular conductor 314 Outer second linear conductor 315 Outer second arc conductor 410 First power supply conductor 420 Second power supply conductor

Claims (1)

(57) [Scope of request for utility model registration] 1. A semi-open high-frequency device having a semi-open type inner coil and a semi-open type outer coil connected in series to the inner coil, and heating a straight rod-shaped work such as a shaft. In the induction heating coil, the inner coil includes an inner first arc-shaped conductor and the inner first arc-shaped conductor.
An inner first linear conductor connected to the other end of the arc-shaped conductor, an inner semi-arc conductor connected to the other end of the inner first linear conductor, and an inner semi-arc conductor connected to the other end of the inner semi-arc conductor And an inner second arc-shaped conductor connected to the other end of the inner second linear conductor. One end of the outer coil is connected to the inner second arc-shaped conductor. An outer first arc-shaped conductor, an outer first linear conductor connected to the other end of the outer first arc-shaped conductor, an outer semicircular conductor connected to the other end of the outer first linear conductor, An outer second linear conductor connected to the other end of the outer semicircular conductor, and an outer second arc conductor connected to the other end of the outer second linear conductor; A first power supply conductor is connected to the arc-shaped conductor, and a second power supply conductor is connected to the outer second arc-shaped conductor, respectively. The inner first linear conductor, the inner second linear conductor, the outer first linear conductor, and the outer second linear conductor are parallel to the axis of the workpiece, and the inner first linear conductor and the outer first linear conductor. 1
The linear conductor is disposed on one side of the work, the inner second linear conductor and the outer second linear conductor are disposed on the other side of the work, and each linear conductor is directly in contact with the peripheral surface of the work. A high-frequency induction heating coil, wherein each of the arc-shaped conductors and each of the semi-arc-shaped conductors directly face the peripheral surface of the work.