WO2020031489A1

WO2020031489A1 - Electromagnetic induction heating device

Info

Publication number: WO2020031489A1
Application number: PCT/JP2019/022789
Authority: WO
Inventors: 忠窪野; 精次河本
Original assignee: Tsk株式会社
Priority date: 2018-08-07
Filing date: 2019-06-07
Publication date: 2020-02-13
Also published as: JP2020024833A; JP6515397B1; TW202008849A

Abstract

Provided is an electromagnetic induction heating device that, without reducing the efficiency for heating an object to be heated, can cool magnets for heating the object to be heated. This electromagnetic induction heating device 100 is provided with a table 101 that retains a plurality of magnets so that the magnets face an object to be heated WK. A heat sink 103 is formed on a back surface 101a of the table 101 on the opposite side from the electromagnets 105, and the heat sink 103 is covered by a back-surface jacket 107. The heat sink 103 is formed in a ring shape hanging down, in the downward direction in the drawing, from the circumferences, continuously along the circumferences, of four concentric circles centered on the center of driven rotation of the table 101. A cavity section 108 is formed between the back-surface jacket 107 and the back surface 101a of the table 101, and a gas supplier 110 supplying air to this cavity section 108 and a gas discharger 111 discharging air therefrom are provided to the back-surface jacket.

Description

Electromagnetic induction heating device

(4) The present invention relates to an electromagnetic induction heating device for heating an object to be heated by generating an induced current.

Conventionally, there has been known an electromagnetic induction heating device for heating an object to be heated made of a conductor by generating an induced current. For example, Patent Literature 1 below discloses a magnetic heater device that generates an induced current in a conductive member and heats the frame by rotating and driving a frame that holds a plurality of magnets alternately opposed to the conductive member with different magnetic poles. Is disclosed. In this case, Patent Literature 1 below discloses that a cooling mechanism for cooling the magnet is provided.

JP 2004-527147 A

However, Patent Document 1 does not describe what, where, and how the cooling mechanism is provided to configure the magnet so that the magnet can be cooled, and the magnet cannot be cooled substantially. Further, in an electromagnetic induction heating device such as a magnetic heater device that generates an induced current for heating an object to be heated, the provision of the cooling mechanism may reduce the heating efficiency of the object to be heated.

The present invention has been made to address the above-described problem, and an object of the present invention is to provide an electromagnetic induction heating device capable of cooling a magnet for heating an object to be heated without reducing the heating efficiency of the object to be heated. Is to provide.

In order to achieve the above object, the feature of the present invention is that a work support supporting a heating target which is a heating target, and each magnetic pole of a plurality of magnets on the side of the heating target supported by the work support are the same. A table arranged in a plane in an orientation, and table driving means for driving the table to rotate with respect to the object to be heated, by rotating and displacing a plurality of magnets with respect to the object to be heated, An electromagnetic induction heating device that generates an induced current in an object and heats the object, forming a gas supply device that sends gas to the back side opposite to the work support with respect to the table, and a cavity on the back side of the table A back jacket that covers the back surface together with the cavity portion, and the back jacket is a gas supply device that sends gas from the outside of the back jacket to the cavity portion, and a cavity that communicates with the inside and outside of the back jacket. The gas inside is to and an exhaust port leading to the outside of the cavity.

In this case, as the gas, in addition to air, an inert gas such as nitrogen can be used. In addition, a compressor can be used as the gas supply device in addition to the fan.

According to the feature of the present invention configured as described above, the electromagnetic induction heating device sends gas to the back surface opposite to the work support with respect to the table holding the magnet for heating the object to be heated. Since the gas supply device is provided, the magnet for heating the object to be heated can be cooled without lowering the heating efficiency of the object to be heated. Further, according to the feature of the present invention configured as described above, the electromagnetic induction heating apparatus includes the back surface jacket provided with the gas supply device and the exhaust port on the back surface side of the table, respectively. In particular, it is possible to effectively cool the back surface of the table by preventing the air sent to the back surface side of the table and the back surface side of the table from being heated by the propagation of temperature from the object to be heated.

Another feature of the present invention is that, in the electromagnetic induction heating device, the gas supply device sends gas toward the back surface of the table.

According to another feature of the present invention configured as described above, the electromagnetic induction heating device sends the gas toward the back surface of the table, so that the gas supply device sends the gas in parallel along the back surface of the table. Thus, the magnet can be efficiently cooled.

Another feature of the present invention is that, in the electromagnetic induction heating device, the gas supply device sends gas to a portion between the rotation drive center and the outer edge of the table.

According to another feature of the present invention configured as described above, the electromagnetic induction heating device may be configured such that the gas supply device sends gas to a portion between the rotary drive center and the outer edge of the table, and thus the rotary drive center portion of the table. That is, the magnet can be cooled more efficiently than when gas is sent to a portion where the rotational drive speed is relatively slow.

Another feature of the present invention is that, in the electromagnetic induction heating device, the exhaust port is formed at a position where the distance from the rotation driving center of the table is longer than the distance from the rotation driving center of the table of the gas supply device. It is in.

According to another feature of the present invention configured as described above, in the electromagnetic induction heating device, the exhaust port is located at a position where the distance from the rotation driving center of the table is farther than the distance from the rotation driving center of the table of the gas supply device. Due to the formation, the gas guided to the outside in the radial direction of the table by the rotationally driven table can be effectively guided to the discharge port and discharged to the outside of the back jacket.

Another feature of the present invention resides in that the electromagnetic induction heating device includes a gas discharger that guides gas in the cavity to the outside of the cavity in the exhaust port.

According to another feature of the present invention configured as described above, since the electromagnetic induction heating device includes the gas exhaust device that guides the gas in the cavity to the outside of the cavity at the exhaust port, the gas in the back jacket is removed. It is possible to positively discharge and introduce new gas into the backside jacket, so that the backside of the table can be effectively cooled.

In this case, a compressor as well as a fan can be used as the gas discharger.

Another feature of the present invention is that, in the electromagnetic induction heating device, the back jacket and the table project in a non-contact manner to portions facing each other at a position close to each other to bend the hollow portion and the outside of the back jacket. And a restricting portion for communicating with the diaphragm.

According to another feature of the present invention configured as described above, the electromagnetic induction heating device includes a back surface jacket and a table, which are opposed to each other at a position close to each other, projecting out of contact with each other in a non-contact manner with the hollow portion and the back surface jacket. Since the throttle portion is provided to communicate with the outside while being bent, the leakage of gas in the hollow portion formed by the back surface jacket on the back surface side of the rotatably driven table can be effectively suppressed.

Another feature of the present invention is that, in the electromagnetic induction heating device, the aperture portion is oriented in a direction other than the object to be heated, in which the opening to the outside of the back jacket is opposed to the table.

According to another feature of the present invention configured as described above, in the electromagnetic induction heating device, the opening to the outside of the back jacket in the narrowed portion faces in a direction other than the object to be heated, which is arranged to face the table. Therefore, the object to be heated can be efficiently heated without obstructing the heating of the object to be heated. In this case, the direction other than the object to be heated in which the opening to the outside of the back jacket in the narrowed portion is disposed to face the table may be, for example, the radial direction of the table or the back surface of the table.

Further, another feature of the present invention, in the electromagnetic induction heating device, further comprises a control device for controlling each operation of the table drive means and the gas supply device, when the control device interrupts the rotation drive of the table, The object of the present invention is to terminate the operation control of the gas supply device after interrupting the rotation drive control of the table by the table drive means.

According to another feature of the present invention configured as above, the electromagnetic induction heating device, when the control device interrupts the rotation driving of the table, interrupts the rotation driving control of the table by the table driving means, and then controls the gas supply device. Since the operation control is completed, it is possible to prevent the temperature of the magnet from rising after the rotation of the table is stopped.

Another feature of the present invention resides in that the electromagnetic induction heating device further includes a heat sink including one or a plurality of protrusions protrudingly provided on the back surface side of the table.

According to another feature of the present invention configured as described above, the electromagnetic induction heating device includes the heat sink including one or a plurality of protrusions provided on the back surface side of the table, so that the electromagnetic induction heating device is efficiently provided. The back of the table can be cooled.

Another feature of the present invention is that, in the electromagnetic induction heating device, the heat sink is formed to extend continuously or intermittently in the direction of rotation of the table.

According to another feature of the present invention configured as above, in the electromagnetic induction heating device, the heat sink is formed to extend continuously or intermittently in the rotational driving direction of the table, so that the table is driven to rotate smoothly. In addition to this, the air supplied by the gas supply device can be smoothly circulated along the rotation driving direction of the table, and the back surface of the table can be effectively cooled.

Another feature of the present invention is that, in the electromagnetic induction heating device, the heat sink is formed between the magnets held on the table.

According to another feature of the present invention configured as described above, in the electromagnetic induction heating device, since the heat sink is formed between the magnets held on the table, the gas supplied by the gas supply device is supplied to the table. The magnet can be guided to a portion directly below the magnet held in the magnet, and the magnet can be cooled effectively.

In order to achieve the above object, the present invention provides a work support for supporting a heating target which is a heating target, and the magnetic poles of a plurality of magnets in the same direction on the side of the heating target supported by the work support. A table arranged in a plane and table driving means for rotating the table with respect to the object to be heated are provided, and a plurality of magnets are rotationally displaced with respect to the object to be heated, so that An electromagnetic induction heating device for generating and heating an induction current, comprising: a heat sink comprising one or more protrusions protruding from a rear surface of a table, wherein the heat sink is continuous in a direction of rotation of the table. Alternatively, it can be formed to extend intermittently.

According to this, the electromagnetic induction heating device includes a heat sink including one or a plurality of protrusions formed continuously or intermittently in the direction of rotation of the table on the back side of the table. Can be smoothly rotated, and the air supplied by the gas supply device can be smoothly circulated along the rotation driving direction of the table to effectively cool the back surface of the table. That is, the electromagnetic induction heating device according to the present invention can cool the magnet for heating the object to be heated without lowering the heating efficiency of the object to be heated.

In order to achieve the above object, the present invention provides a work support for supporting a heating target which is a heating target, and the magnetic poles of a plurality of magnets in the same direction on the side of the heating target supported by the work support. A table arranged in a plane and table driving means for rotating the table with respect to the object to be heated are provided, and a plurality of magnets are rotationally displaced with respect to the object to be heated, so that What is claimed is: 1. An electromagnetic induction heating apparatus for generating an induction current for heating, comprising: a heat sink comprising one or more protrusions provided on a rear surface side of a table, wherein the heat sink comprises a magnet and a magnet held by the table. And can be formed between them.

According to this, since the electromagnetic induction heating device includes the heat sink including one or more protrusions formed between the magnets held on the table on the back side of the table, the gas supply device Can be guided to the portion directly below the magnet held on the table, and the magnet can be cooled effectively. That is, the electromagnetic induction heating device according to the present invention can cool the magnet for heating the object to be heated without lowering the heating efficiency of the object to be heated.

It is a front view showing typically the structure of the electromagnetic induction heating device concerning one embodiment of the present invention. It is a block diagram of a control system which controls operation of an electromagnetic induction heating device. FIG. 2 is a perspective view schematically illustrating an external configuration of a heating target object to be heated by the electromagnetic induction heating device illustrated in FIG. 1. FIG. 2 is a plan view schematically illustrating an appearance configuration on a front side of a table including a magnet constituting the electromagnetic induction heating device illustrated in FIG. 1. FIG. 5 is a plan view schematically illustrating an external configuration of a back surface side of the table illustrated in FIG. 4. FIG. 2 is a partially enlarged view showing details of a configuration within a dashed circle A shown in FIG. 1. It is a front view which shows typically the structure of the electromagnetic induction heating apparatus which concerns on the modification of this invention.

Hereinafter, an embodiment of the electromagnetic induction heating device according to the present invention will be described with reference to the drawings. FIG. 1 is a front view schematically showing the structure of the electromagnetic induction heating device 100 according to the present invention. FIG. 2 is a block diagram of a control system that controls the operation of the electromagnetic induction heating device 100. The electromagnetic induction heating device 100 is a mechanical device for pre-heating an object to be heated WK made of an ingot of an aluminum material, which is a raw material of an aluminum wheel or an aluminum sash, in a manufacturing process of the product.

First, the object to be heated WK will be briefly described. As shown in FIG. 3, the object to be heated WK is an object to be heated by the electromagnetic induction heating device 100, and is formed by forming an aluminum material into a rod shape. More specifically, the object to be heated WK is formed in a trapezoidal conical shape as a whole having a trapezoidal cross-sectional shape.

(Configuration of electromagnetic induction heating device 100)
The electromagnetic induction heating device 100 is a mechanical device for generating an induced current in the object to be heated WK to heat it, and mainly includes a table 101, a magnet 105, a back jacket 107, an electric motor 118, a vertical drive mechanism 122, A work support 124 and a control device 130 are provided.

As shown in FIG. 4, the table 101 is a component for holding the plurality of magnets 105, and is formed of a plate-shaped body having a circular shape in plan view (hereinafter, also referred to as a "disk"). More specifically, the table 101 has a magnet body 102, a heat sink 103, and a table-side squeezing section forming section 104 formed on the disc body, and a back surface 101 a serving as a lower surface in the drawing of the disc body. A connecting shaft portion 101b extending in a bar shape from the center to the lower side in the figure is formed.

The magnet holding portion 102 is a portion for holding the magnet 105, and is formed of a hole with a bottom. In this case, the magnet holding portion 102 is formed at a depth such that one end face of the N pole and the S pole is exposed to the object to be heated WK arranged to face the table 101. In the magnet holding unit 102, a plurality of magnet holding units 102 are formed at equal intervals on each of three concentric circles centered on the rotation drive center of the table 101. In FIG. 4, the work support 124 and the object to be heated WK are indicated by two-dot chain lines.

As shown in FIG. 5, the heat sink 103 is a portion for absorbing and radiating heat of the magnet 105 held by the table 101, and is opposite to the side of the table 101 where the magnet holding portion 102 is opened (downward in the figure). Side) is formed so as to protrude on the side of the back surface 101a. More specifically, the heat sink 103 is formed in an annular shape that hangs downward from the circumference of each of four concentric circles centered on the rotation drive center of the table 101 along the same circumference.

In this case, the heat sink 103 has a trapezoidal cross section in which the thickness decreases from the back surface 101a side toward the tip end. Further, the heat sink 103 is provided between each of the magnet holding units 102 formed on the three concentric circles, inside the innermost magnet holding unit 102, and outside the outermost magnet holding unit 102, respectively. Is formed.

As shown in FIG. 6, the table-side throttle portion forming unit 104 is a portion that forms a throttle unit 113 in cooperation with a jacket-side throttle unit forming unit 112 described later to suppress the outflow of air in the cavity 108. Are formed on the outer peripheral portion of the table 101 so as to protrude radially outward. More specifically, the table-side throttle portion forming unit 104 includes a plurality of annular projecting pieces 104a projecting radially outward from the outer peripheral portion of the table 101 at predetermined intervals in the axial direction of the table 101 (this embodiment). 3) are formed.

The magnet 105 is a component for generating an induced current in the object to be heated WK, and is formed in a columnar shape. The magnet 105 is housed in a plurality of magnet holding portions 102 formed on the plate surface of the table 101 with one of both end surfaces exposed. In this case, each magnet 105 is housed in the table 101 in such a direction that the same magnetic pole (N pole in this embodiment) is exposed on the plate surface side of the table 101. Each magnet 105 is held in a state flush with the plate surface of the table 101.

The magnets 105 may be held in a state in which the magnets 105 enter the inside of the plate surface of the table 101, or may be held in a state of protruding from the plate surface. In addition, the arrangement mode of each magnet 105 is appropriately determined according to the specification of heating the object to be heated WK, and is not limited to the present embodiment. Further, in the present embodiment, neodymium magnets are used for the magnets 105, but magnets other than neodymium magnets, for example, various magnets such as ferrite, samarium cobalt, or alnico can be used.

テーブル In the table 101, the output shaft of the electric motor 118 is connected to a connection shaft portion 101b formed on the back surface 101a via a relay shaft 106 having a coupling. The back surface 101a side of the table 101 is covered by a back jacket 107.

The back jacket 107 is a component that forms and covers the cavity 108 on the back surface 101a side of the table 101, and is formed by forming a metal material into a cylindrical shape. More specifically, back jacket 107 mainly includes opposing portion 107a and side portion 107b.

The opposing portion 107a is a flat plate-shaped component that is disposed opposingly at a position separated from the back surface 101a of the table 101. In this case, the position where the opposing portion 107a is separated from the back surface 101a of the table 101 is a position which is separated by a distance necessary for forming the hollow portion 108. The opposed portion 107a is formed with two through holes, and a gas supply device 110 and a gas discharge device 111 are provided in each of these through holes.

The side surface portion 107b is a cylindrical component disposed on the outer edge of the facing portion 107a and covering the space between the back surface 101a of the table 101 and the facing portion 107a. One side (the lower part in the figure) of the side surface portion 107b is integrated with the facing portion 107a by welding, and the other end portion is provided with a jacket side narrowed portion forming portion 112.

Thus, a cavity 108 is formed in a space surrounded by the back surface 101a, the facing portion 107a, and the side portion 107b of the table 101. The back jacket 107 is supported by a movable support base 117 via a support sleeve 116 formed at the center of the facing portion 107a in a state where the side portion 107b is slidably fitted to the cover sleeve 115.

The cavity 108 is a portion for storing air for cooling the back surface 101a of the table 101. The size of the cavity 108 is appropriately set according to the surface area of the back surface 101a of the table 101 and the cooling capacity.

The gas supply device 110 is a mechanical device for sending air into the cavity 108 formed inside the back jacket 107. Specifically, the gas supply device 110 is configured by a fan whose operation is controlled by a control device 130 described later. The gas supply device 110 is provided so as to be fitted into a through hole formed in the facing portion 107a of the back jacket 107. In this case, the gas supply device 110 is provided at a position radially inside the gas discharge device 111 in the facing portion 107a.

The gas discharger 111 is a mechanical device for sending air to the outside of the back jacket 107 into the cavity 108 formed inside the back jacket 107. Specifically, the gas discharger 111 is configured by a fan whose operation is controlled by the control device 130. The gas discharger 111 is provided so as to be fitted into a through hole formed in the facing portion 107a of the back jacket 107. In this case, the gas discharger 111 is provided at a position radially outside the gas discharger 111 in the facing portion 107a.

As shown in FIG. 6, the jacket-side throttle portion forming section 112 is a portion that forms a throttle section 113 in cooperation with the table-side throttle section forming section 104 to suppress the outflow of air in the cavity 108. And two metal discs disposed between the three protruding pieces 104a constituting the table-side throttle forming section 104 in a non-contact state with each protruding piece 104a. In this case, the two discs are overlaid on the side surface 107b and fixed by bolts. Thus, between the table-side throttle portion forming portion 104 and the jacket-side throttle portion forming portion 112, while communicating with the cavity portion 108, it repeatedly extends in a zigzag manner on the upper surface side of the table 101 and communicates with the outside air. An annular narrowed portion 113 is formed.

流路 Furthermore, a flow path changing plate 114 is provided at the upper end in the drawing of the jacket-side throttle forming section 112. The flow path changing plate 114 is a component for changing the direction of the opening in which the narrowed portion 113 opens toward the object to be heated WK, and the outer edge of the flat metal plate is bent downward in the figure. It is formed in a shape. Thus, the opening of the throttle unit 113 on the side communicating with the outside air is bent outward in the radial direction of the table 101, and further bent downward in the drawing to open.

The cover sleeve 115 is a component that covers a space between the back jacket 107 and the base housing 123, and is formed by forming a metal material into a cylindrical shape. The cover sleeve 115 has one (lower side in the figure) end fixed to the base housing 123, and the other side has a side surface 107b of the back jacket 107 slidable in the vertical direction in the figure via a sealing material. Fitted in a freely movable state.

The support sleeve 116 is a component that supports the relay shaft 106 and the back jacket 107 on the movable support base 117, and is formed by forming a metal material into a cylindrical shape. One end (lower side in the figure) of the support sleeve 116 is fixed on the movable support base 117, and the other end (upper side in the figure) fixedly supports the back jacket 107. In addition, the support sleeve 116 supports the relay shaft 106 in a rotatable state on the inner peripheral portion via a bearing.

The movable support base 117 is a component for supporting the table 101, the back jacket 107, and the electric motor 118, respectively, and is formed by forming a metal plate into a box shape. The movable support base 117 is supported by a vertical drive mechanism 122 while being connected to a guide support 121 via a linear guide 120.

The electric motor 118 is a drive source for driving the table 101 to rotate, and is constituted by a servomotor whose operation is controlled by the control device 130. That is, the electric motor 118 corresponds to a table driving unit according to the present invention. The electric motor 118 is connected to the table 101 via the relay shaft 106.

The linear guide 120 is a component for guiding the table 101, the back jacket 107, and the electric motor 118 in the vertical direction in the drawing so as to approach or separate from the object to be heated WK, and includes a rail provided on the guide support 121. A slider is provided on the movable support base 117 and reciprocates on a rail provided on the guide support 121.

The guide support 121 is a component for supporting the rails constituting the linear guide 120, and is formed by forming a metal material into an L shape. In this case, the guide support 121 is formed to extend along the guide direction so as to support the rail provided on the guide support 121 along the guide direction of the table 101, the back jacket 107, and the electric motor 118. I have. The guide support 121 is supported by the base housing 123.

The vertical drive mechanism 122 is a mechanical device provided with a drive source for displacing the table 101, the back jacket 107, and the electric motor 118 in a direction to approach or separate from the object to be heated WK. The vertical movement driving mechanism 122 includes an electric motor (for example, an AC servo motor) (not shown) whose operation is controlled by the control device 130, a jack for converting the rotational driving force of the electric motor in the vertical direction in the drawing, and a base housing for the jack. It is configured to have respective support bases supported on 123. That is, the movable support base 117, the linear guide 120, the guide support 121, and the vertical drive mechanism 122 approach the table 101, the back jacket 107, and the electric motor 118 integrally with or away from the object to be heated WK. Make up the mechanism.

The base housing 123 is a component for supporting the table 101, the back jacket 107, the cover sleeve 115, and the work support 124 while accommodating the approach mechanism and the electric motor 118, and forms a metal rod into a box shape. It is constructed in pairs. The base casing 123 is provided with a top plate 123b formed of a plate-like body having a through hole 123a through which the support sleeve 116 penetrates at the upper end in the figure, and the cover sleeve 115 and the work support are placed on the top plate. 124 are respectively supported.

The workpiece support 124 is a component for supporting the object to be heated WK on the table 101, and a base housing outside the table 101 so that the object to be heated WK can be hung on the plate surface of the table 101. 123 are provided. In this case, the work support 124 is provided at a position that supports the object to be heated WK at a position offset radially outward with respect to the rotational drive center portion on the plate surface of the table 101. The work support 124 is formed in a V-shape in which both ends are respectively fitted from above so as to support both ends of the object to be heated WK from below.

温度 The work support 124 is provided with a temperature detector 125. The temperature detector 125 detects the temperature of the object to be heated WK and outputs the detected temperature to the control device 130.

The control device 130 is configured by a microcomputer including a CPU, a ROM, a RAM, and the like. The control device 130 comprehensively controls the entire operation of the electromagnetic induction heating device 100 and stores a heating processing program (not shown) stored in a storage device in advance. Is performed, the heating processing of the object to be heated WK is performed. Specifically, the control device 130 controls the operation of the electric motor 118 to rotationally drive the table 101, and controls each operation of the gas supply device 110 and the gas discharge device 111 to control the operation of the gas supply device 110 and the gas discharge device 111. Supply air to 108. In addition, the control device 130 controls the operation of the vertical movement drive mechanism 122 to control the position of the table 101 in the vertical direction in the figure.

The control device 130 includes an input device composed of a group of switches for receiving an instruction from an operator and inputting the input to the control device 130, an operation panel 131 having a display lamp for displaying an operation state of the control device 130, and a liquid crystal display device. It has. The control device 130 includes a power supply unit that receives power from an external power supply and supplies power to the gas supply device 110, the gas discharge device 111, the electric motor 118, and the vertical movement drive mechanism 122 that require power. However, since it does not directly relate to the present invention, its description is omitted. The control device 130 may be housed in a metal box and attached to the outer surface of the base housing 123, or may be provided at a position away from the base housing 123 via a wire. Good.

(Operation of the electromagnetic induction heating device 100)
Next, the operation of the electromagnetic induction heating device 100 configured as described above will be described. In the description of the operation, in the process of manufacturing an aluminum product such as an aluminum wheel or an aluminum sash, the heated object WK, which is a raw material of these materials, is heated up to 400 in a previous step of melting in a melting furnace. A preheating operation of heating to about 500 ° C. to soften will be described.

First, the operator operates the operation panel 131 to turn on the power of the electromagnetic induction heating device 100. Thus, the control device 130 executes the control program (not shown) to control the operation of the vertical drive mechanism 122, thereby lowering the table 101 and positioning the table 101 at the position farthest from the object to be heated WK.

Next, the worker sets the object to be heated WK on the electromagnetic induction heating device 100. Specifically, the worker places the object to be heated WK on the work support 124 in the electromagnetic induction heating device 100. More specifically, the worker sets the upper-side surface (upper surface in the drawing) of the heated object WK having a trapezoidal cross section in a direction facing the table 101 so as to face the heated object WK. Both ends are placed on the work support 124, respectively.

In this case, since the work support 124 is formed of two inclined surfaces that open upward in a V-shape, the work support 124 is fitted to the two side surfaces formed of the inclined surfaces of the object to be heated WK, and is stable. Can support the object to be heated WK. The setting operation of the object to be heated WK may be directly performed manually by an operator, or may be performed by using a mechanical device such as a robot arm that grips the object to be heated WK and places it on the work support 124. You may. Further, the object to be heated WK may be arranged in such a manner that the lower bottom surface (the lower surface in the drawing) of the trapezoid shape faces the table 101. In this case, the workpiece support 124 may be formed in a planar shape on which both ends of the object to be heated WK are placed.

Next, the operator positions the magnet 105 with respect to the object to be heated WK. Specifically, the operator operates the operation panel 131 to operate the vertical movement drive mechanism 122 to bring the plate surface of the table 101 to the closest position without contacting the opposing surface of the object to be heated WK. Position.

Next, the worker heats the object to be heated WK. Specifically, the operator operates the operation panel 131 to instruct the control device 130 to execute the heating processing program. In response to this instruction, control device 130 rotates table 101 by operating electric motor 118. Thereby, the object to be heated WK is rapidly heated by the induced current generated inside.

{Circle around (1)} The control device 130 also starts the operation of the gas supply device 110 and the gas discharge device 111 together with the start of the operation of the electric motor 118. Thereby, air is introduced into the cavity 108 inside the back jacket 107 by the gas supply device 110, and the air in the cavity 108 is discharged out of the cavity 108 by the gas discharger 111 (FIG. 1). At dashed arrows). In this case, the air guided into the cavity 108 is guided radially outward of the table 101 by the rotation of the table 101, so that the air is smoothly discharged from the gas discharger 111.

In the present embodiment, the air in the base case 123 is introduced into the cavity 108 by the gas supply device 110 and the air in the cavity 108 is discharged into the base case 123 by the gas discharger 111. . Thus, the influence of the flow of the air introduced or discharged into the cavity 108 can be contained in the base housing 123.

On the other hand, the table 101 is heated together with the magnet 105 by heating the object to be heated WK. In this case, the table 101 is provided with the heat sink 103 on the back surface 101a, and the heat sink 103 is provided in the hollow portion 108, so that the temperature rise can be suppressed. Thereby, the temperature rise of the magnet 105 held on the table 101 is suppressed, and the decrease in the magnetic force is suppressed.

一部 Part of the air in the hollow portion 108 leaks out of the electromagnetic induction heating device 100 via the throttle portion 113 (see a broken arrow in FIG. 6). In this case, since the outlet of the narrowed portion 113 is opened on the opposite side to the object to be heated WK by the flow path changing plate 114, the heating of the object to be heated WK is not hindered.

Next, when the object to be heated WK reaches a predetermined temperature, the worker stops heating the object to be heated WK and takes it out of the electromagnetic induction heating device 100. Specifically, the operator operates the operation panel 131 to instruct the control device 130 to stop the execution of the heat treatment program. In response to this instruction, control device 130 stops the rotation of table 101 by stopping the operation of electric motor 118. Thereby, the worker can take out the object to be heated WK on the work support 124.

In this case, the control device 130 may stop the operation of the gas supply device 110 and the gas discharger 111 together with the stop of the operation of the electric motor 118, but may continue the operation for a while after the stop of the operation of the electric motor 118. Is also good. For example, the control device 130 may stop the operation of the gas supply device 110 and the gas discharge device 111 after a predetermined time elapses after the operation of the electric motor 118 is stopped, or the temperature detected by the temperature detector 125 may be a predetermined temperature. In the following cases, the operations of the gas supply device 110 and the gas discharge device 111 may be stopped. Thus, the electromagnetic induction heating device 100 can prevent the temperature of the magnet 105 from rising after the rotation of the table 101 is stopped.

In the work of removing the heated object WK, the operator checks the temperature of the heated object WK displayed on the operation panel 131 and confirms that the heated object WK has reached a predetermined temperature. Can be. In addition, the operator previously experimentally acquires a time until the heated object WK reaches the predetermined temperature, and the heated object WK reaches the predetermined temperature depending on whether or not the predetermined time has elapsed. You can also understand that. Further, the control device 130 can automatically stop the operation of the electric motor 118 when the predetermined temperature is reached or when the predetermined time has elapsed. The work of taking out the object to be heated WK may be directly performed manually by a worker, or may be performed by using a mechanical device such as a robot arm that grips the object to be heated WK and carries it out of the work support 124. Good.

{Circle around (2)} Then, the worker puts the object to be heated WK taken out of the electromagnetic induction heating apparatus 100 into a melting furnace, and then pours the molten object to be heated WK into a mold to form a molded article such as an aluminum wheel. Since the process of processing the object to be heated WK taken out of the electromagnetic induction heating apparatus 100 is not directly related to the present invention, the description thereof is omitted.

Next, when performing a heat treatment on the new object to be heated WK, the operator arranges the new object to be heated WK on the work support 124 and executes the heat treatment in the same manner as described above. On the other hand, when ending the preheating step, the operator turns off the power of the electromagnetic induction heating device 100 and ends the operation.

As can be understood from the above description of operation, according to the above embodiment, the electromagnetic induction heating device 100 is different from the work support 124 with respect to the table 101 holding the magnet 105 for heating the object to be heated WK. Since the heat sink 103 and the gas supply device 110 for sending air are provided on the opposite back surface 101a side, the magnet 105 for heating the object to be heated WK is cooled without lowering the heating efficiency of the object to be heated WK. can do.

The implementation of the present invention is not limited to the above embodiment, and various changes can be made without departing from the purpose of the present invention. In addition, in each modification shown below, the same components as those of the electromagnetic induction heating device 100 in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.

For example, in the above embodiment, the electromagnetic induction heating device 100 is configured by providing the heat sink 103 and the back surface jacket 107 on the back surface 101a side of the table 101, respectively. However, the electromagnetic induction heating apparatus 100 can also be configured by providing at least one of the heat sink 103 and the back jacket 107 on the back surface 101a side of the table 101. Therefore, in the case where the heat sink 103 is not provided, the electromagnetic induction heating device 100 can form the back surface 101a of the table 101 into a flat planar shape.

In the above embodiment, the gas supply device 110 is configured to send air toward the back surface 101a of the table 101. Thereby, the electromagnetic induction heating device 100 can suppress the rotation resistance of the table 101 and can cool the table 101 effectively. However, the gas supply device 110 may be configured to send air to the back surface 101a of the table 101 in a direction other than the direction perpendicular to the radial direction, for example, in a direction parallel to the radial direction. In this case, the gas supply device 110 can be provided on the side surface portion 107b of the back jacket 107.

In the above embodiment, the gas supply device 110 is configured to send air to a portion of the table 101 between the rotation driving center and the outer edge. However, the gas supply device 110 may be configured to send air toward a rotation drive center of the table 101. In this case, the table 101 can be configured to apply a rotational driving force of the table 101 to the outer edge.

In addition, in the above embodiment, the electromagnetic induction heating device 100 is configured by providing the back surface jacket 107 on the back surface 101a side of the table 101. However, the electromagnetic induction heating apparatus 100 may be configured by omitting the back surface jacket 107 since an air flow may be formed on the back surface 101a side of the table 101. In this case, the electromagnetic induction heating apparatus 100 may be configured such that the gas supply device 110 is disposed on the back surface 101a side of the table 101 so as to form an air flow, and the gas discharge device 111 is omitted.

In the above embodiment, the back jacket 107 is provided with the gas discharger 111. However, as shown in FIG. 7, the back jacket 107 only needs to be able to guide the air inside the cavity 108 to the outside of the cavity 108, and thus can be configured without the gas discharger 111. In this case, the back jacket 107 may be provided with an exhaust port 109 formed of a through hole for guiding the air inside the cavity 108 to the outside of the cavity 108 (see the broken line arrow in FIG. 7).

In addition, in the above embodiment, the gas discharger 111 is provided at a position radially outside the table 101 from the gas supply device 110 at the facing portion 107a of the back jacket 107. Thereby, the air in the cavity 108 can be efficiently guided to the outside of the cavity 108. However, it can be provided at the same position in the radial direction of the table 101 as the gas supply device 110 or at a position radially inside the table 101 with respect to the gas supply device 110 in the facing portion 107a of the back jacket 107. In addition, when the exhaust port 109 is provided in place of the gas exhaust device 111 as described above, the back jacket 107 is, like the gas exhaust device 111, radially outside the gas supply device 110 in the back jacket 107, It can be formed at the same position in the radial direction or at the radial inside.

Further, in the above-described embodiment, the narrowed portion 113 formed of the bent flow passage is formed between the outer peripheral portion of the table 101 and the back jacket 107. However, it is also possible to form the throttle unit 113 composed of a linear flow passage between the outer peripheral portion of the table 101 and the back jacket 107. The narrowing portion 113 is a flow passage that bends or extends linearly between the front end portion of the side surface portion 107b and the back surface 101a by disposing the front end portion of the side surface portion 107b of the back surface jacket 107 to face the back surface 101a of the table 101. Can be formed. In addition, the electromagnetic induction heating apparatus 100 may be configured so that the table 101 and the back surface jacket 107 are slidably contacted with each other, thereby omitting the throttle unit 113.

Also, in the above embodiment, the aperture portion 113 is configured such that the opening facing the outside opens downward in the figure. However, the throttle unit 113 may be configured to be able to discharge the air in the cavity 108 to the outside. Therefore, the throttle section 113 is configured such that the opening facing the outside faces radially outward of the table 101 by forming the flow path changing plate 114 in a flat annular shape without bending the outer edge of the flow path changing plate 114. be able to. Further, the throttle section 113 may be configured such that the flow path changing plate 114 is omitted and the opening facing the outside faces the object to be heated WK side.

In the above embodiment, the gas supply device 110 and the gas discharge device 111 are each configured by a blower so that air flows through the cavity 108. However, the gas supply device 110 and the gas discharge device 111 may be configured to allow the gas to flow through the cavity 108. Therefore, the gas supply device 110 and the gas discharge device 111 may be configured by a compressor such as a pump. Further, the gas supply device 110 may be configured to supply an inert gas such as nitrogen to the cavity 108.

In the above embodiment, the heat sink 103 is formed of a plurality of annular bodies that are arranged concentrically on the back surface 101a of the table 101 and extend continuously in the circumferential direction. However, it is only necessary that the table 101 be constituted by one or a plurality of protrusions formed on the back surface 101a. Therefore, the heat sink 103 can be constituted by a plurality of annular bodies arranged concentrically and extending intermittently in the circumferential direction. Further, the heat sink 103 may be formed in a wall shape or a fold shape extending linearly continuously or intermittently. Further, the heat sink 103 may be formed of one or more hemispherical projections on the back surface 101a of the table 101.

In the above embodiment, the heat sink 103 is formed between the magnets 105 in the radial direction and arranged concentrically on the back surface 101 a of the table 101. However, the heat sink 103 is formed on the rear surface 101a of the table 101 at the same radial position as the radial magnets 105 arranged concentrically, in other words, at a position directly below the magnets 105 in the drawing. You can also.

In addition, in the above-described embodiment, when suspending the rotation drive of the table 101, the control device 130 terminates the operation control of the gas supply device 110 after suspending the rotation drive control of the table 101 by the electric motor 118. Thereby, the electromagnetic induction heating device 100 can prevent the temperature of the magnet 105 from rising after the rotation of the table 101 is stopped. However, when the rotation of the table 101 is interrupted, the control device 130 ends the operation control of the gas supply device 110 simultaneously with or before the interruption of the rotation drive control of the table 101 by the electric motor 118. Is also good.

In addition, in the above embodiment, the electromagnetic induction heating device 100 includes the control device 130 that controls each operation of the gas supply device 110, the gas discharge device 111, and the electric motor 118. However, the electromagnetic induction heating device 100 may be configured without the control device 130. In this case, the electromagnetic induction heating device 100 may control each operation of the gas supply device 110, the gas discharge device 111, and the electric motor 118 by manual operation by an operator.

In the above embodiment, the object to be heated WK has a trapezoidal cross section. However, the shape of the object to be heated WK is not limited to the above embodiment, and may be any shape as long as it can be arranged to face the magnet 105 provided on the table 101. Therefore, the object to be heated WK can be formed of not only a circular cross-sectional shape, but also a rod-shaped body having a rectangular or triangular shape, or a flat plate-shaped body.

In the above embodiment, the object to be heated WK is made of an ingot as a raw material of an aluminum product such as an aluminum wheel or an aluminum sash. However, the object to be heated WK may be an ingot as a raw material of various products (for example, an aluminum cylinder block or the like) other than an aluminum wheel or an aluminum sash. The object to be heated WK is a paramagnetic material other than aluminum (for example, aluminum, manganese, platinum or glass) or a diamagnetic material (for example, copper, gold, silver, zinc, lead, glass or wood). Material. Furthermore, the object to be heated WK may be a semi-finished product obtained by processing raw materials before reaching a finished product such as an aluminum wheel or an aluminum sash.

In addition, in the above embodiment, the work support 124 has a V-shaped cross section into which the heating target WK formed in a trapezoidal cone shape is fitted from above. However, the work support 124 may be configured to detachably support the object to be heated WK. Therefore, the workpiece support 124 may include a clamp mechanism that presses the object to be heated from above or from the side while the object to be heated WK is placed. Further, the work support 124 may be configured to support the object to be heated WK while moving on the table 101 like a belt conveyor.

WK: object to be heated,
DESCRIPTION OF SYMBOLS 100 ... Electromagnetic induction heating apparatus, 101 ... Table, 101a ... Back surface, 101b ... Connection shaft part, 102 ... Magnet holding part, 103 ... Heat sink, 104 ... Table side drawing part forming part, 104a ... Protrusion piece, 105 ... Magnet, 106 ... Relay shaft, 107 ... Back jacket, 107a ... Opposing part, 107b ... Side part, 108 ... Cavity part, 109 ... Exhaust port,
Reference numeral 110: gas supply device, 111: gas discharger, 112: jacket side throttle portion forming portion, 113: throttle portion, 114: flow path changing plate, 115: cover sleeve, 116: support sleeve, 117: movable support base, 118 ... electric motors,
120: Linear guide, 121: Guide support, 122: Vertical drive mechanism, 123: Base housing, 124: Work support, 125: Temperature detector,
130: control device, 131: operation panel.

Claims

A work support that supports the object to be heated,
A table in which the magnetic poles of a plurality of magnets are arranged in a plane in the same direction on the object to be heated supported by the work support,
Table driving means for driving the table to rotate with respect to the object to be heated, and generating an induced current in the object to be heated by rotating and displacing the plurality of magnets with respect to the object to be heated. An electromagnetic induction heating device for heating by heating
A gas supply device that sends gas to the back side opposite to the work support with respect to the table,
A back jacket that covers the back surface together with the cavity while forming a cavity on the back surface side of the table,
The back jacket,
The gas supply device that sends the gas to the cavity from outside the back jacket,
An electromagnetic induction heating device, comprising: an exhaust port that communicates with the inside and the outside of the back jacket to guide the gas in the cavity to the outside of the cavity.
The electromagnetic induction heating device according to claim 1,
The gas supply device,
An electromagnetic induction heating device, wherein the gas is sent toward the back surface of the table.
In the electromagnetic induction heating device according to claim 1 or 2,
The gas supply device,
An electromagnetic induction heating device, wherein the gas is sent to a portion of the table between a rotation drive center and an outer edge portion.
In the electromagnetic induction heating device according to any one of claims 1 to 3,
The exhaust port is
An electromagnetic induction heating device, wherein a distance from a rotation drive center of the table is formed at a position farther than a distance from the rotation drive center of the table of the gas supply device.
In the electromagnetic induction heating device according to any one of claims 1 to 4,
An electromagnetic induction heating apparatus comprising: a gas discharger that guides the gas in the cavity to the outside of the cavity at the exhaust port.
The electromagnetic induction heating device according to any one of claims 1 to 5,
The back jacket and the table,
An electromagnetic induction heating device, comprising: a narrowing portion that projects in a non-contacting manner at a position facing each other at a position close to each other to bend and communicate between the hollow portion and the outside of the back jacket.
The electromagnetic induction heating device according to claim 6,
The aperture unit is
An electromagnetic induction heating apparatus, characterized in that an opening to the outside of the back jacket faces in a direction other than the object to be heated, which is arranged to face the table.
The electromagnetic induction heating device according to any one of claims 1 to 7, further comprising:
A control device for controlling each operation of the table driving means and the gas supply device,
The control device includes:
An electromagnetic induction heating apparatus, wherein when the rotation drive of the table is interrupted, the operation control of the gas supply device is terminated after the rotation drive control of the table by the table drive unit is interrupted.
The electromagnetic induction heating device according to any one of claims 1 to 8, further comprising:
An electromagnetic induction heating apparatus, comprising: a heat sink including one or a plurality of protrusions provided to protrude from the back side of the table.
The electromagnetic induction heating device according to claim 9,
The heat sink is
An electromagnetic induction heating device characterized by being formed to extend continuously or intermittently in the direction of rotation of the table.
In the electromagnetic induction heating device according to claim 9 or 10,
The heat sink is
An electromagnetic induction heating device, which is formed between magnets held on the table.