JP6005929B2 - Induction heating device - Google Patents

Description

  The present invention relates to an induction heating apparatus for rapidly heating a workpiece to a predetermined temperature by induction heating in a furnace.

  Traditionally, in modern society where people live with a variety of products, including home appliances, there are numerous parts used for these products, and the materials that are used for the purpose are selected and used. ing. For example, aluminum alloys are very often used because of their characteristics such as being light and relatively strong, having a beautiful metal skin and being less susceptible to rust.

  It is well known that aluminum alloys are improved in strength by adding specific components and performing heat treatment. Although there are various heat treatments for aluminum alloys, the T6 treatment is a commonly performed heat treatment comprising a solution treatment and an aging treatment.

  In the case of the AC4CH alloy, the solution treatment is performed at about 525 ° C., and the purpose is to uniformly dissolve the additive elements in the aluminum alloy, and then the solid solution state obtained by solution treatment by rapid cooling. Hold. The next aging treatment is performed at about 160 ° C., and precipitation of elements dissolved in the aluminum occurs, and the precipitates stop the movement of dislocations to increase the strength.

  Temperature management is important to obtain the required strength of the aluminum alloy. Currently, a furnace is used for heat treatment, and a hot-air circulating furnace is generally used as a type of furnace for the purpose of suppressing variations in the temperature in the furnace and stabilizing the quality. As a heat source, an electric heater, a gas burner or the like is used. However, the above-described heat source has poor heating efficiency and temperature controllability, and there is a problem with high-quality heat treatment.

  By the way, a heating method by induction heating having high efficiency heating and high controllability is attracting attention. In this induction heating, a high frequency current is passed through the heating coil to generate a magnetic flux, and an eddy current is caused to flow by inducing an electromotive force in the heating element by linking the magnetic flux to the heating element. This is a heating method in which the heating element self-heats with Joule heat by the equivalent resistance. However, workpieces that can be heated by induction heating with high efficiency are limited to magnetic metals and the like that are easy to induce eddy currents and have an appropriate resistance value, and it is difficult to efficiently heat nonmagnetic metals such as aluminum. It was.

  In other words, induction heating has been used for melting iron-based materials, which are ferromagnetic materials, or heat treatment, because of its advantages such as rapid heating, high energy efficiency, and good environment. Aluminum alloys are non-magnetic. Because it is a body, it was not heated by self-heating and was hardly used. In some cases, induction heating devices that can heat non-magnetic metals are provided, but the heating target is limited to very simple shapes such as planes or cylinders. It was not suitable and was not a universal heating method.

JP 2004-204330 A

  Patent Document 1 discloses a heat treatment furnace, which is an apparatus for performing an efficient heat treatment by combining fluidized bed heat treatment and hot air heat treatment, and is based on a burner method, in order to heat an aluminum alloy workpiece, It took a considerable amount of time and was not suitable for rapid heat treatment. As described above, the heat treatment of the aluminum alloy has a drawback that it requires a lot of energy and time because it has a low resistivity and magnetic permeability and hardly generates heat. For these reasons, the problem (technical problem or object) to be solved by the present invention is to realize a heat treatment that can be rapidly heated, has high energy efficiency, and is environmentally friendly.

  In view of this, the inventor has intensively studied to solve the above problems, and as a result, the invention of claim 1 is an induction heating apparatus having a heating chamber for storing and heating a heating object made of a non-magnetic metal. The heating chamber has a box shape, and an induction heating coil arranged around the heating chamber, a heating element made of a magnetic material arranged to wrap the heating object, and an alternating current are supplied. An AC power supply device to be controlled, the heating element and the induction heating coil are brought close to each other, and the heating object is heated indirectly by electromagnetic induction by the induction heating coil to indirectly heat the object to be heated. The above-described problem has been solved by using an induction heating apparatus characterized by the above.

  The invention according to claim 2 is an induction heating device having a heating chamber for storing and heating a heating object made of a non-magnetic metal, wherein the heating chamber has a box shape and is arranged around the heating chamber. An induction heating coil, a lower heating element made of a magnetic material arranged so as to wrap the lower side of the heating object, and an upper heat generation made of a magnetic material arranged so as to wrap around the heating object. And an alternating current power supply device for controlling supply of alternating current, and the lower heating element and the upper heating element are self-heated by electromagnetic induction by the induction heating coil and are sandwiched between the lower heating element and the upper heating element. The above-mentioned problem has been solved by using an induction heating apparatus characterized in that the heating object is indirectly heated.

  The invention according to claim 3 is an induction heating apparatus having a heating chamber for storing and heating a heating object made of a non-magnetic metal, the induction heating means disposed around the heating chamber, and the heating Supplying control of the gap heating element and the AC power source, which is inserted into the narrow gap portion when the narrow gap portion exists in the heating object, and is composed of a magnetic body disposed close to the surface portion of the target object The induction heating device, wherein the heating object is indirectly heated by self-heating the heating element by electromagnetic induction by the induction heating means, The said subject was solved.

  The invention according to claim 4 is an induction heating device having a heating chamber for storing and heating a heating object made of a non-magnetic metal, the induction heating means disposed around the heating chamber, and the heating A heating element made of a magnetic material disposed close to the surface of the object and an AC power supply device that controls the supply of AC power, wherein the heating object is a composite material of aluminum and carbon, and the induction The problem has been solved by providing an induction heating apparatus characterized in that the heating element is heated indirectly by electromagnetic induction by a heating means to indirectly heat the object to be heated.

  The invention according to claim 5 is an induction heating device having a heating chamber that houses and heats a heating object made of a non-magnetic metal, the induction heating means disposed around the heating chamber, and the heating It is made of a magnetic material arranged close to the surface of the object, and is a chain, linear, fiber, rod, small piece, or block piece formed so as to correspond to the outer shape of the heating object. It consists of a heating element of any shape and an AC power supply device that controls the supply of AC power, and the heating object is heated indirectly by electromagnetic induction by the induction heating means to indirectly heat the object to be heated. The above-described problems have been solved by using an induction heating apparatus characterized by the above.

  The invention according to claim 6 is an induction heating apparatus having a heating chamber for storing and heating a heating object made of a non-magnetic metal, the induction heating means disposed around the heating chamber, and the heating A heating element composed of a magnetic body disposed close to the surface portion of the object, and a combination of at least two types corresponding to the outer shape of the heating object, and an AC power supply device that controls supply of AC power Thus, the problem is solved by providing an induction heating apparatus in which the heating object is indirectly heated by self-heating of the heating element by electromagnetic induction by the induction heating means.

  The invention according to claim 7 is the induction heating device according to any one of claims 1, 2, 3 or 4, wherein the heating element has a sheet shape or a plate shape. It has been solved.

  In the invention of claim 1, in particular, not only the heating object (workpiece) made of a non-magnetic metal can be heated very quickly with high efficiency, but also it has high energy efficiency and is good for the environment. Heat treatment can be realized. In particular, there is the greatest advantage that heating can be realized regardless of the shape of the heating object (workpiece). Moreover, the heating efficiency can be further increased by wrapping the object to be heated. Further, the invention of claim 2 has an advantage that the heating object can be easily and quickly covered by the configuration in which the heating object is wrapped in the lower heating element and the upper heating element. In particular, it can be made excellent in handleability.

  In invention of Claim 3, it can be made to heat also in the clearance gap part of a heating target object, and there exists an effect which can be combined heating. In the invention of claim 4, even if it is a composite material of aluminum and carbon, it is possible to easily obtain a high temperature because a magnetic metal that easily generates heat is generated and the heat is transferred to an object to be heated. In the invention of claim 5, handling properties can be improved by forming the heating elements in a chain shape, a linear shape, a rod shape, a small piece shape, a block piece or the like.

  In the invention of claim 6, the heating efficiency can be further improved here also by combining at least two types of the heating elements. According to the seventh aspect of the present invention, since the heating element is a sheet or a plate-like material, simple handling is possible.

(A) is sectional drawing of 1st Embodiment of this invention, (B) is principal part sectional drawing made into the chain form of another embodiment of the (a) part location of (A), (C) is (B). The main part sectional view made into the chain line shape of another embodiment of (B), (D) is the principal part sectional view made into the line shape of another embodiment of (B), (E) is another embodiment of (B). It is principal part sectional drawing made into fibrous form. (A) is sectional drawing of 2nd Embodiment of this invention, (B) is principal part sectional drawing made into the chain form of another embodiment of (A) part location of (A), (C) is (B). The main part sectional view made into the chain line shape of another embodiment of (B), (D) is the principal part sectional view made into the sheet form of another embodiment of (B), (E) is another embodiment of (B). It is principal part sectional drawing made into the plate-shaped part. (A) is a cross-sectional view of another embodiment of the present invention, (B) is a cross-sectional view of still another embodiment of the present invention, (C) is an enlarged view of a main part of an embodiment different from (A), (D) is a principal part enlarged view of another embodiment different from (B). (A) is sectional drawing of 3rd Embodiment of this invention, (B) is principal part sectional drawing made into the chain form of another embodiment of the (c) part location of (A), (C) is (B). It is principal part sectional drawing of another embodiment of. (A) is the perspective view which isolate | separated the structural member of another embodiment of this invention, (B) is sectional drawing which assembled each member of (A). (A) is the perspective view which isolate | separated the structural member of another embodiment of this invention, (B) is sectional drawing which assembled each member of (A).

  Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 6 show cross-sectional views of the present invention. The heating chamber 1 is composed of a box-shaped one having a heat insulating function. Specifically, it is composed of a floor portion 11, four surrounding wall portions 12, 12,..., And a ceiling portion 13, and at least one surface of the wall portion 12 serves as a door portion 12a. The heating object B (work or the like) is configured to be freely put in and out.

  As shown in FIG. 1, the floor portion 11 is installed such that the lower surface portion of the floor portion 11 rises to a height of a predetermined interval, and is configured to serve as a bottom portion. Further, as shown in FIG. 2, a bottom plate 15 may be provided below the floor portion 11 with a predetermined interval.

  In any case, the induction heating means 2 as the induction heating coil 21 is disposed on the lower surface side of the floor portion 11. Specifically, an induction heating coil 21 such as an IH heater is attached so as to contact the lower surface side of the floor portion 11. The wall portions 12, 12,... Of the heating chamber 1 are kept warm by a heat insulating material. The induction heating coil 21 may be provided around the heating chamber 1 as shown in FIGS. 5 and 6.

  The induction heating means 2 is provided with an AC power supply device 8 for supplying and controlling an AC current. Specifically, the AC power supply device 8 is a power source of commercial power (100 v 50 Hz or 60 Hz), which is converted by an inverter or the like, and an AC current of several tens Hz is used to induce the IH heater or the like. An electromagnetic induction effect is applied to the heating coil 21.

  A is a heating element and is made of a magnetic material such as iron or stainless steel. The magnetic material is not limited to soft iron, and any magnetic material may be used, and a ferromagnetic material is also possible. The heating element A self-heats due to electromagnetic induction. The heating element A is integrated as shown in FIGS. 1A to 1E as the first embodiment.

  In FIG. 1 (A), the said heat generating body A is comprised like a futon, and is comprised so that the heating target B mentioned later may be wrapped. 1 (B) and (C), the heating element A is a chain A1, and in particular, in FIG. 1 (B), it is constituted by a ring A11. In FIG. 1 (C), the ball A12 is a string. It is comprised so that it may continue in the thing p. The ring A11 is composed of a chain or a chain. The chain may be single or multiple.

  In FIG. 1 (D), the heating element A is a filamentous material A2 made of a magnetic material, and in FIG. 1 (E), the heating element A is a fibrous material A3 made of a magnetic material. In these drawings, the heating object B is wrapped with the filamentous material A2 or the fibrous material A3.

  The heating object B is made of a nonmagnetic metal such as aluminum or aluminum alloy, and has various shapes. Although what was shown in FIGS. 1-3 is the heating target B, such as the heat sink made from aluminum or aluminum alloy which the cross section became comb-tooth shape, it is not limited to the shape. In particular, in FIGS. 4 and 5, the cross-section is E-shaped, and in FIG. 6 is also a deformed E-shape. However, in any case, the shape is not limited. It has a shape.

  As shown in FIGS. 2A to 2E, the second embodiment of the heating element A is configured as an assembly of a lower heating element DA and an upper heating element UA. In FIG. 2 (A), both the lower heating element DA and the upper heating element UA are the heating elements A having a chain A1, and are particularly composed of a ring A11.

  In FIG. 2B, both the lower heating element DA and the upper heating element UA are heating elements A having a chain A1, and in particular, the balls A12 are configured to be continuous with a string-like object p. In FIG. 2 (C), both the lower heating element DA and the upper heating element UA are the heating elements A having the chain A1, and in particular, the cylindrical piece A13 is continuous with the string-like object p.

  In FIG. 2D, both the lower heating element DA and the upper heating element UA are sheets A4 made of a magnetic material such as iron or stainless steel, and are configured to wrap the heating object B up and down. In FIG. 2E, both the lower heating element DA and the upper heating element UA are heating elements A that are plate-like objects A5, and are configured to wrap the heating object B from the upper part, the side part, and the lower part. Yes.

  FIG. 3A shows a modification of the first embodiment of the heating element A, and the heating object B is made up of small pieces A6 of many spherical pieces A61 made of a magnetic material such as iron or stainless steel. Wrapped in a buried manner. FIG. 3B shows a modification of the second embodiment of the heating element A. The lower heating element DA is composed of a chain A1, and the upper heating element UA is a small piece A6 that is a spherical piece A61. Consists of and mixed. The spherical piece A61 includes a granular portion having a relatively small diameter.

  FIG. 3C shows a modification of the first embodiment of the heating element A. The heating object B is formed by small pieces A6 of a large number of square pieces A62 made of a magnetic material such as iron or stainless steel. Wrapped in a buried manner. In the case shown in FIG. 3D, the heating object B is wrapped in small pieces A6 of a large number of cylindrical pieces A63 made of a magnetic material.

  As a third embodiment of the heating element A, as shown in FIGS. 4A to 4C, the heating element A is a set of a lower heating element DA, an upper heating element UA, and a gap heating element 3. Sometimes configured as a body. The gap heating element 3 enters the gap of the heating object B, and is configured as a small unit constituent member than the constituent member of the heating element A.

  Specifically, as shown in FIGS. 4A and 4B, it may be made of a magnetic material such as iron or stainless steel, or may be made of a non-magnetic material. In particular, the small unit constituent member has a small granularity, and the ring A11 is small. In FIG. 4C, a chain line A1 in which balls A12 are continuous is provided. Further, the gap heating element 3 includes a linear object A2, a fibrous object A3, a sheet A4, a plate A5, a small piece A6, which will be described later, a rod piece A7, which will be described later, and the like, as in the specific configuration of the heating element A. If it exists and is comprised small, it will not be restrict | limited to a shape etc.

  5 (A) and 5 (B), the heating element A is configured as a bar piece A7, and in particular, the diameter thereof is formed to be equal to the gap between the heating object B. It is an embodiment. That is, the lower heating element DA is configured with a large number of rod pieces A7 as a horizontal plane, and this time, the upper heating element UA is configured to have a step, and the upper heating element UA is disposed in the gap portion of the heating object B. The large number of bar pieces A7 are stepped and configured as shown in an assembly drawing [see FIG. 5B].

  As shown in FIGS. 6 (A) and 6 (B), the fourth embodiment of the heating element A is configured as a heating element A as a block piece A8 facing the lower and upper surfaces of the heating object B. ing. Specifically, the block piece A8 is composed of a lower mold part A8a and an upper mold part A8b. Specifically, the lower mold part A8a that becomes the lower heating element DA and the upper mold part A8b that becomes the upper heating element UA enter the gap portion of the heating object B, and an assembly drawing [see FIG. 6B]. ] Is configured as follows. Alternatively, the lower mold part A8a and the upper mold part A8b may be disposed close to the surface part of the heating object B.

On the lower surface of the ceiling portion 13 of the heating chamber 1, a stirring / circulating device 6 for providing uniform heat to the heating element A is provided. Specifically, the stirring / circulating device 6 is configured such that a propeller-shaped fan 61 can be driven. Further, the fan 61 is not limited to a propeller type. In addition, the agitation / circulation device 6 may not be provided as long as it can provide fairly uniform heat. A thermocouple is inserted in the heating chamber 1 to control the temperature.

  Specifically, in the case of a chain, an elliptical ring made of soft iron was used, and the heating object B was an aluminum / carbon composite material. Also in this case, the heat of the heating object B can be rapidly increased. That is, the gap heating element 3 is formed small, and by increasing the contact with the heating object B (work) as much as possible, there is an effect that the heating object B (work) can be heated uniformly as quickly as possible.

A ... heating element, A1 ... chain, A2 ... linear material, A3 ... fibrous material, A4 ... sheet,
A5 ... Plate-like material, A6 ... Small piece, A7 ... Bar piece, A8 ... Block piece, DA ... Lower heating element,
UA: upper heating element, B: heating object, 1 ... heating chamber, 2 ... induction heating means,
3 ... Gap heating element, 8 ... AC power supply.

Claims (7)

An induction heating apparatus having a heating chamber that houses and heats a heating object made of a non-magnetic metal, the heating chamber having a box shape, and an induction heating coil disposed around the heating chamber; ,
A heating element made of a magnetic material arranged to wrap the heating object;
It consists of an AC power supply that controls the supply of AC current,
The heating element and the induction heating coil are brought close to each other, and the heating object is heated indirectly by electromagnetic induction by the induction heating coil to indirectly heat the heating object. Induction heating device. An induction heating apparatus having a heating chamber that houses and heats a heating object made of a non-magnetic metal, the heating chamber having a box shape, and an induction heating coil disposed around the heating chamber; ,
A lower heating element made of a magnetic material arranged to wrap the lower side of the heating object;
An upper heating element made of a magnetic material arranged so as to wrap around the heating object from above;
It consists of an AC power supply that controls the supply of AC current,
The lower heating element and the upper heating element are self-heated by electromagnetic induction by the induction heating coil, and the heating object sandwiched between the lower heating element and the upper heating element is indirectly heated. Induction heating device. An induction heating device having a heating chamber for storing and heating a heating object made of a non-magnetic metal, and induction heating means disposed around the heating chamber;
A gap heating element, which is made of a magnetic material disposed close to the surface of the heating object, and is inserted into the narrow gap when the narrow gap exists in the heating object;
It consists of an AC power supply that controls the supply of AC power,
An induction heating apparatus characterized in that the heating object is indirectly heated by self-heating of the heating element by electromagnetic induction by the induction heating means. An induction heating device having a heating chamber for storing and heating a heating object made of a non-magnetic metal, and induction heating means disposed around the heating chamber;
A heating element made of a magnetic material disposed close to the surface of the heating object;
It consists of an AC power supply that controls the supply of AC power,
The heating object is a composite material of aluminum and carbon,
An induction heating apparatus characterized in that the heating object is indirectly heated by self-heating of the heating element by electromagnetic induction by the induction heating means. An induction heating device having a heating chamber for storing and heating a heating object made of a non-magnetic metal, and induction heating means disposed around the heating chamber;
It consists of a magnetic body disposed close to the surface of the heating object,
A heating element in the form of a chain, a line, a fiber, a bar, a small piece, or a block piece formed to correspond to the outer shape of the object to be heated;
It consists of an AC power supply that controls the supply of AC power,
An induction heating apparatus characterized in that the heating object is indirectly heated by self-heating of the heating element by electromagnetic induction by the induction heating means. An induction heating device having a heating chamber for storing and heating a heating object made of a non-magnetic metal, and induction heating means disposed around the heating chamber;
It consists of a magnetic body disposed close to the surface of the heating object,
A heating element combined with at least two kinds corresponding to the outer shape of the heating object;
It consists of an AC power supply that controls the supply of AC power,
An induction heating apparatus characterized in that the heating object is indirectly heated by self-heating of the heating element by electromagnetic induction by the induction heating means.   The induction heating device according to any one of claims 1, 2, 3, and 4, wherein the heating element has a sheet shape or a plate shape.

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