JP3638968B2 - Induction heating device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an induction heating device for various components, and more particularly to an induction heating device that can heat an object to be heated while moving it straight.
[0002]
[Prior art]
Conventionally, when heating an object to be heated such as a disk-shaped part by high-frequency induction heating for heat treatment or the like, the heating coil is generally shown as an annular two-turn coil 15 as shown in FIG. 3A or as shown in FIG. An end surface heating coil composed of such a rectangular annular two-turn coil 16 is used. When heating with such an end surface heating coil is performed with the object to be heated simply positioned above the end surface heating coil, the distance from the coil to the heating surface is not uniform, and the direction of the current differs depending on the part. Therefore, heating unevenness occurs.
[0003]
For this reason, heating is performed uniformly by rotating the object to be heated, but there is a drawback that a rotating mechanism for rotating the object to be heated is required and the apparatus becomes complicated. On the other hand, since it is necessary to carry out in an inert atmosphere in order to prevent oxidation due to heating, the end face heating coil and the rotation mechanism are arranged in a conventionally isolated atmosphere chamber and heat treatment is performed in an inert gas atmosphere. Therefore, the heating apparatus becomes large and the objects to be heated are processed one by one through the process of carrying-in-heating-carrying-out, so that mass production by continuous processing cannot be performed, productivity is poor, and cost is high. There was a problem to become.
[0004]
[Problems to be solved by the invention]
The present invention has been devised in view of the above circumstances, can be heated uniformly and efficiently without rotating the object to be heated, can be continuously heat-treated to improve production efficiency, and also has an atmosphere chamber An object of the present invention is to provide an induction heating apparatus that can be easily configured, can be mass-produced without requiring a large-scale apparatus, and can greatly reduce the cost.
[0005]
[Means for Solving the Problems]
The induction heating apparatus according to the present invention that solves the above-mentioned problems is a waveform coil portion that is arranged adjacent to each other and bends more than one cycle in a substantially straight wave shape in the same plane and turns a plurality of times, and the current flows in the same direction. It consists of the heating coil body of the multiwave shape formed so that it may have at least one pair. As the heating coil body, for example, a quadruple waveform coil portion is configured, and the second waveform coil portion and the third waveform coil portion are arranged adjacent to each other so that current flows in the same direction. Can be heated.
[0006]
And the said heating coil body is supported horizontally, and the to-be-heated object support rail is constructed in the longitudinal direction near the upper surface of the heating coil body, and the heated object side guides are provided along the longitudinal direction on both sides thereof. By providing, it can heat uniformly, moving a to-be-heated material straightly moving reliably. The side guides of the object to be heated can be heated most efficiently and uniformly by arranging the side guides at intervals that substantially coincide with the amplitudes of the adjacent corrugated coil portions so that current flows in the same direction. Can do.
[0007]
Furthermore, the heating coil body, the heated object support rail, and the heated object side guide are covered with a cover, and an inert gas atmosphere is ejected into the cover to form an inert gas atmosphere tunnel. Can be continuously heated in an inert atmosphere.
[0008]
[Action]
The waveform pitch and amplitude of the heating coil are selected depending on the size of the object to be heated. By setting the length of the waveform coil part to 1 cycle or more and the amplitude to be greater than the diameter or width of the object to be heated, the object to be heated Is moving in the longitudinal direction while approaching the upper surface of the coil body, the entire bottom surface of the object to be heated will pass at least the immediate upper surface of the corrugated coil portion at least once, which is the same as when the object to be heated is rotated. Or it can heat more uniformly than that.
[0009]
By making the amplitudes of at least one pair of adjacent corrugated coil portions, in which the current flows in the same direction, substantially equal to the diameter or width of the object to be heated, the current of the pair of corrugated coil portions in which the current flows in the same direction. It can be passed directly above and can be heated more efficiently and uniformly.
[0010]
In addition, since the object to be heated can be heated while being transported, for example, the coil body is placed in a tunnel formed by an appropriate cover, and the inside of the tunnel is made an inert atmosphere. Continuous heat treatment at can be performed.
[0011]
【Example】
FIG. 1 shows an embodiment of the induction heating device of the present invention, particularly its heating coil body.
The heating coil body 1 of the present embodiment is bent at one or two cycles in a substantially wave shape in the same plane from one end connected to a high frequency power source (not shown), as shown in the figure. 1a is formed and U-turned to bend in parallel with the first corrugated coil portion 1a while maintaining a predetermined distance to form a double corrugated coil portion 1b. Similarly, a quadruple waveform coil portion 1d is formed extending in parallel through an interval larger than the second interval, and the end thereof is U-turned to the second waveform coil portion side to thereby form the double waveform. A triple corrugated coil portion 1c extending in parallel and adjacent to the coil portion 1b is formed and the end thereof is connected to a high frequency power source. As shown in FIG. 2, a non-magnetic material 2 such as heat-resistant cement containing alumina as a main component is embedded between the multiple corrugated coil portions to form a flat heating coil body 1.
[0012]
Therefore, the currents in the second waveform coil portion 1b and the third waveform coil portion 1c arranged adjacent to the central portion of the heating coil body 1 are in the same direction. The waveform pitch and amplitude of the heating coil are selected according to the size of the object to be heated. The amplitudes of the adjacent second and third waveform coil portions 1b and 1c are the same as the diameter of the object to be heated. It is preferable that the lengths are approximately equal and have a length of at least one cycle. In the present embodiment, two cycles are used.
[0013]
Heating coil body 1, as shown in FIG. 2, it is supported horizontally by a suitable support means 5, which is formed of ceramics of alumina or silicon nitride, which is a non-magnetic material in the longitudinal direction in proximity to the upper surface The heated object support rails 6 ₁ and 6 ₂ are arranged in parallel so that the heated object can slide on the support rail and move straight in the longitudinal direction. Reference numerals 7 ₁ and 7 ₂ are side guides to be heated arranged on both sides in the longitudinal direction above the heating coil body 1, and are arranged at intervals corresponding to the width of the article to be heated. in, as is clear from FIGS. 1 and 2, is located above the inner surface of the lateral guides 7 ₁ substantially coincides with the valley portions of the double-th waveform coil portion 1b, and the other lateral guides 7 ₂ It arrange | positions so that an inner surface may correspond with the peak part of the triple corrugated coil part 1c.
[0014]
And if necessary, the heating coil body 1, the heated object support rail 6 and the heated object side guide 7 are covered with a cover 9, and an inert gas is blown into the interior to create an inert gas atmosphere. A tunnel was constructed to allow heating in an inert atmosphere. In FIG. 1, an unmarked arrow indicates the direction of current.
[0015]
The heating apparatus according to the present embodiment is configured as described above. For example, the cylindrical object to be heated 10 is pushed by the appropriate pressing means on the support rails 6 ₁ and 6 ₂ from the direction a in FIG. It is guided by the direction guides 7 ₁ and 7 ₂ and moves straight on the heating coil body 1. At that time, in the second waveform coil portion 1b and the third waveform coil portion 1c located adjacent to the central portion of the heating coil body 1, current flows in the same direction and the amplitude is just the heated object. Therefore, while the object to be heated moves along the upper surface of the heating coil body 1, the entire bottom surface passes just above the corrugated coil portions 1b and 1c. Therefore, since the object to be heated 10 is heated efficiently under the same conditions by synergizing the magnetic fields from the second waveform coil portion 1b and the third waveform coil portion, there is no temperature unevenness due to the part. Heated uniformly.
[0016]
In addition, since the object to be heated can be heated while being transported through the tunnel in an inert gas atmosphere, continuous heating in an inert atmosphere can be performed with a simple device, and the processing capacity can be improved particularly compared to the conventional case. it can.
[0017]
As mentioned above, although one Example of the heating apparatus of this invention was shown, this invention is not restricted to the said Example, A various design change is possible. For example, in the coil body of FIG. 1, the first waveform coil portion and the fourth coil portion located on the outer side do not necessarily need to be wave-shaped, and can be configured in a substantially linear shape. In addition, according to the induction heating apparatus according to the present invention, the object to be heated is not limited to a cylindrical object, and uniform heating is possible even if the object is an irregular shape such as a rectangular shape.
[0018]
【The invention's effect】
The induction heating device of the present invention has the following special effects.
While the object to be heated moves closer to the upper surface of the coil body and moves in the longitudinal direction, the entire bottom surface of the object to be heated passes at least once over the upper surface of the corrugated coil portion, so that the object to be heated is evenly efficient without rotating. It can be heated well, can be continuously heated, can be processed in large quantities without the need for a large-scale apparatus, and the cost can be greatly reduced.
[0019]
The at least one pair of corrugated coil portions adjacent to each other in the same direction of current flow has an amplitude substantially equal to the diameter or width of the object to be heated, so that the object to be heated passes directly above the pair of corrugated coil portions. Can be heated more efficiently and uniformly.
[0020]
Further, by arranging the heating coil body in a tunnel formed by a suitable cover and making the inside of the tunnel an inert atmosphere, a continuous heat treatment in an inert atmosphere can be performed with a simple apparatus.
[Brief description of the drawings]
FIG. 1 is a plan view of a heating coil body according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a heating apparatus according to an embodiment of the present invention corresponding to the AA cross section of FIG.
FIGS. 3A and 3B are schematic diagrams of a conventional induction heating apparatus, in which FIG. 3A shows an end surface heating coil made of an annular two-turn coil, and FIG. 3B shows an end surface heating coil made of a rectangular annular two-turn coil.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Heating coil body 2 Nonmagnetic material 6 Heated object support rail 7 Heated object side guide 9 Tunnel-shaped cover 10 Heated object

Claims (4)

Heating having multiple waveform coil portions formed so as to have at least one pair of adjacently disposed waveform coil portions that are bent in one or more cycles in a substantially straight wave shape within the same plane and then turned a plurality of times. It consists of a coil body, the heating coil body is supported horizontally, and a heated object support rail is installed in the longitudinal direction in the vicinity of the upper surface of the heating coil body, and the heated object side along the longitudinal direction on both sides thereof A heated guide is provided, the heated object is placed on the heated object support rail, and the heated object is heated while the heated object moves straight along the upper surface of the multiple coil portion. Induction heating device.   2. The induction heating apparatus according to claim 1, wherein the heating coil body includes a quadruple waveform coil portion, and the second waveform coil portion and the third waveform coil portion are arranged adjacent to each other so that current flows in the same direction. . The object to be heated side guides, the coil body induction heating device current according to claim 1 or 2 Symbol mounting is arranged substantially matching distance between adjacent arranged coil component amplitude to flow in the same direction . The heating coil body, wherein the covering with a cover article to be heated support rail and the object to be heated side guides, according to claim 1 which is to be configured tunnels inert gas atmosphere by ejecting inert gas into the cover The induction heating apparatus according to any one of?

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