TW202002714A - Object to be heated for electromagnetic induction heating device, method for heating object to be heated, and method for manufacturing aluminum foil - Google Patents

Abstract

The present invention provides an object to be heated for an electromagnetic induction heating device, a method for heating the object to be heated, and a method for manufacturing aluminum foil, wherein heating time can be reduced or uniformized. The object 100 to be heated, which is to be heated by the electromagnetic induction heating device 200, is formed in an overall shape of a truncated trapezoidal cone having a trapezoidal cross section. The object 100 to be heated has a planar part 101 on a surface on the side serving as the upper side of the trapezoidal shape. The planar part 101 is a portion arranged facing a magnet 203 of the electromagnetic induction heating device 200, is a plane parallel to the rotary surface of the magnet 203, and is formed to have a flatness of no greater than 5 mm. In the object 100 to be heated, four side surfaces 102, which are surfaces other than the planar part 101 and are adjacent to the planar part 101, and a bottom surface 103 on the reverse side from the planar part 101 are each formed in an approximate plane. The object 100 to be heated is formed by casting an aluminum material.

Description

Object to be heated for electromagnetic induction heating device, method for heating object to be heated, and method for manufacturing aluminum wheel

The present invention relates to an object to be heated, an object to be heated, and a method of manufacturing an aluminum wheel for an electromagnetic induction heating device that generates an induction current to heat the object to be heated.

Conventionally, an electromagnetic induction heating device is known in which an object to be heated composed of a conductor generates an induction current and heats it. For example, the following Patent Document 1 has disclosed an electromagnetic induction heating device in which a plurality of magnets are arranged with respect to an object to be heated composed of an aluminum wheel, and a rotating body opposed to the same magnetic pole is driven by rotation in this state. The object generates induced current and heats up. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Application Publication No. 2018-18604.

However, when the object to be heated is heated using the electromagnetic induction heating device described in Patent Document 1, even if the object has the same shape, the time for each object to be heated to reach a predetermined temperature may be different, or even if it takes time The failure to reach the predetermined temperature has the problem of low heating efficiency.

The present invention has been made in response to the above-mentioned problems, and its object is to provide an object to be heated for an electromagnetic induction heating device, a method for heating the object to be heated, and a method for manufacturing an aluminum wheel, which can shorten or uniformize the heating time.

In order to achieve the above object, the present invention is characterized by an object to be heated for an electromagnetic induction heating device, which is composed of raw materials or semi-finished products heated and softened by an electromagnetic induction heating device in the steps up to the finished product. The electromagnetic induction heating device is provided with: a work table, where the magnetic poles of a plurality of magnets are arranged in a plane in the same direction; a work table driving means drives the object to be heated and the work table to rotate relative to each other; and a workpiece support, which is in contact with the work table Each of the magnets supports the object to be heated in a state opposed to each other; and by rotating and displacing the object to be heated opposite the magnets and the table, an induction current is generated in the object to be heated and heated to heat the object The object is formed with a flat portion, and a portion of the flat portion that faces each magnet of the table is a plane parallel to the rotation surface of each magnet and the flatness is 5 mm or less.

According to the feature of the present invention constituted as described above, the object to be heated used in the electromagnetic induction heating device is formed with a flat portion, and a portion of the flat portion facing each magnet of the table is a plane parallel to the rotation surface of each magnet The flatness is 5 mm or less, so according to the experiments of the present inventors, the heating time of the object to be heated can be shortened and the heating time can be made uniform.

In addition, another feature of the present invention is the object to be heated for the electromagnetic induction heating device, wherein the object to be heated has a trapezoidal cross-sectional shape extending in a rod shape, and the flat portion is formed in the object to be heated in a trapezoid shape Trapezoid-shaped upper bottom side surface.

According to other features of the present invention constituted as described above, the cross-sectional shape of the object to be heated used in the electromagnetic induction heating device is formed in a trapezoidal shape and extends in a rod shape, and the flat portion is formed on the trapezoidal shape in the object in the trapezoidal shape to be heated The bottom side. This makes it possible to reduce the manufacturing time burden and economic burden of the object to be heated compared to when the object to be heated forms a flat portion on the bottom surface of the trapezoidal shape. In particular, when the object to be heated is molded by casting, a flat portion can be formed at the bottom of the casting mold, so it is easy to cast the object to be heated.

In addition, another feature of the present invention is the object to be heated for the electromagnetic induction heating device, wherein the object to be heated is formed in a plate shape or a rod shape extending in the diameter direction of the rotating circle of the table, and has a rough surface, The rough surface portion is a portion of the object to be heated opposed to the table, and a flat portion is not formed in the center portion of the relatively rotating work surface, and the flat surface portion is formed outside the rough surface portion.

According to other features of the present invention configured as described above, the object to be heated used in the electromagnetic induction heating device is formed with a rough surface portion formed as a plate-shaped or bar-shaped portion of the object to be heated facing the table , And a flat portion is not formed in the center portion of the relatively rotating table, and a flat portion is formed outside the rough portion. Thereby, in the object to be heated, it is not necessary to form a flat portion with a high flatness in the portion of the center of rotation of the table where the induced current is small, which can suppress the reduction of the heating effect and reduce the time and economic burden of the object to be heated. In addition, the rough face can be used as a space in which the batch number of the object to be heated or the name of the manufacturer is engraved.

Moreover, the present invention can be implemented not only as an object to be heated for an electromagnetic induction heating device, but also as a heating method for an object to be heated and a method for manufacturing an aluminum wheel.

Specifically, the heating method of the object to be heated is to use an electromagnetic induction heating device, which includes: a table, in which the magnetic poles of a plurality of magnets are arranged in the same direction on a plane; The rod-shaped object to be heated is driven to rotate relative to the table; and, the work support body supports the object to be heated while facing the magnets of the table; and by heating the objects arranged opposite to the magnets The object and the table rotate relative to each other, and an induction current is generated and heated in the object to be heated; the object to be heated is a raw material or semi-finished product that is softened by heating with an electromagnetic induction heating device in the steps up to the finished product, and the outer surface is At least a portion has a flat portion, which is a plane parallel to the rotation surfaces of the magnets and has a flatness of 5 mm or less; the heating method of the object to be heated also includes a workpiece arranging step, which is such that the object to be heated The plane part in the middle is arranged to face each magnet, and the object to be heated is arranged on the work support. Thereby, the heating method of the object to be heated can shorten and uniformize the heating time when the other surfaces of the object to be heated are arranged to face the magnets.

At this time, in the heating method of the object to be heated, the cross-sectional shape of the object to be heated is formed in a trapezoidal shape and extends in a rod shape, and the flat portion is formed on the surface of the trapezoid-shaped upper bottom side of the object to be heated in the trapezoid shape. Thereby, the heating method of the object to be heated can expect the same effect as the object to be heated described above.

In addition, the heating method of the object to be heated uses an electromagnetic induction heating device, which includes: a table, which arranges the magnetic poles of a plurality of magnets in the same direction; and a table driving means, a plate or a rod The object to be heated is driven to rotate relative to the table; and, the workpiece support supports the object to be heated while facing the magnets of the table; and by arranging the object to be heated to face each magnet and The table rotates relative to the displacement, and generates an induction current and heats the object to be heated; the object to be heated is a raw material or semi-finished product that is softened by heating with an electromagnetic induction heating device in the steps up to the finished product; heating of the object to be heated The method further includes: a flat portion forming step of forming a flat portion on at least a part of the outer surface of the object to be heated, the flat portion being a plane parallel to the rotating surfaces of the aforementioned magnets and having a flatness of 5 mm or less; , The object to be heated is arranged on the workpiece support in such a manner that the flat portion of the object to be heated faces each magnet. Thereby, even if the object to be heated does not have a flat portion, the heating method of the object to be heated can form the flat portion by the step of forming the flat portion, and the same effect as the object to be heated can be expected.

At this time, in the heating method of the object to be heated, the cross-sectional shape of the object to be heated is formed in a trapezoidal shape and extends in the shape of a rod, and the step of forming the flat portion is on the upper bottom side of the trapezoidal shape in the object to be heated in the trapezoid The surface forms a flat portion. Thereby, the heating method of the object to be heated can expect the same effect as the object to be heated described above.

In addition, the manufacturing method of the aluminum wheel specifically uses an electromagnetic induction heating device, which has: a work table, where the magnetic poles of a plurality of magnets are arranged in the same direction on the plane; The rod-shaped object to be heated is driven to rotate relative to the table; and, the work support body supports the object to be heated while facing the magnets of the table; and by heating the objects arranged opposite to the magnets The object rotates relative to the table, and an induced current is generated in the object to be heated and heated to soften it; at least a part of the object to be heated has a flat surface, which is parallel to the rotating surface of each magnet The flat surface and the flatness are 5 mm or less; the manufacturing method of the aluminum wheel also includes a work disposing step, the work disposing step is to arrange the flat part of the object to be heated and the magnets to face each other, so that the object to be heated The object is arranged on the workpiece support. Thereby, the manufacturing method of the aluminum wheel can expect the same effect as the above-mentioned object to be heated and the heating method of the object to be heated.

In addition, the heating method of the object to be heated uses an electromagnetic induction heating device, which includes: a table, which arranges the magnetic poles of a plurality of magnets in the same direction; and a table driving means, a plate or a rod The object to be heated is driven to rotate relative to the table; and, the workpiece support supports the object to be heated while facing the magnets of the table; and by arranging the object to be heated to face each magnet and The relative rotation of the worktable generates induction current and heats the object to be heated; the heating method of the object to be heated includes at least a workpiece disposing step, the workpiece disposing step is to maximize the flatness of the outer surface of the object to be heated The portion to be heated is arranged on the workpiece support in such a manner that the portion serves as a flat portion and is arranged to face each magnet. As a result, the heating method of the object to be heated can shorten the heating time and make it more uniform than when the other surfaces of the object to be heated are arranged opposite to the magnets. In addition, the manufacturing method of the aluminum wheel specifically uses an electromagnetic induction heating device having a table in which the magnetic poles of a plurality of magnets are arranged in the same direction on a plane, and a rod-shaped object to be heated of the aluminum wheel material A table driving means that rotates relative to the table and a workpiece support that supports the object to be heated while facing the magnets of the table, and the object to be heated and the table are arranged to face each magnet Relative rotational displacement generates induction current and heats the object to be heated. The manufacturing method of the aluminum wheel also includes a workpiece arranging step in which the highest flatness part of the outer surface of the object to be heated is used as the planar part. The object to be heated is arranged on the workpiece support in such a manner as to face each magnet. Thereby, the manufacturing method of the aluminum wheel can expect the same effect as the above-mentioned object to be heated and the heating method of the object to be heated.

The following describes one embodiment of an object to be heated for an electromagnetic induction heating device of the present invention (hereinafter simply referred to as "object to be heated"), a method of heating the object to be heated, and a method of heating an aluminum wheel with reference to the drawings. FIG. 1 is a perspective view schematically showing an appearance structure of an object to be heated 100 of the present invention. In addition, the perspective view of FIG. 2 schematically shows the appearance of the object 100 to be heated 100 shown in FIG. 1 viewed from the opposite side of the vertical direction of the figure. In addition, the front view of FIG. 3 schematically shows the structure of the electromagnetic induction heating device 200 which heat-processes the object 100 to be heated shown in FIGS. 1 and 2. 4 is a block diagram of a control system that controls the operation of the electromagnetic induction heating device 200. The object to be heated 100 is a raw material for aluminum products such as aluminum wheels, aluminum doors and windows, and is an object to be heated by an electromagnetic induction heating device 200 described later in the manufacturing process of these products.

(The composition of the object to be heated 100) The object to be heated 100 is an object heated by the electromagnetic induction heating device 200, and is formed by forming an aluminum material into a rod shape. More specifically, the cross-sectional shape of the object to be heated 100 has a trapezoidal shape and is formed into a trapezoidal cone shape as a whole. The object 100 to be heated has a flat portion 101 formed on the upper bottom surface (upper surface in FIG. 1) of the trapezoidal shape.

The flat portion 101 is a portion that is arranged to face the magnet 203 of the electromagnetic induction heating device 200 and is formed as a plane parallel to the rotation surface of the magnet 203 and the flatness is 5 mm or less. Here, the flatness refers to the difference between the plane shape and the geometrically correct plane. When two parallel imaginary planes sandwich the surface of the measurement object, the interval between the two imaginary planes becomes the minimum between the two planes. The plane can be measured with a dial gauge, an optical flat plate (plane gauge), or a laser measuring instrument.

In the object 100 to be heated, the surfaces other than the flat portion 101, specifically, the four side surfaces 102 adjacent to the flat portion 101 and the bottom surface 103 on the opposite side of the flat portion 101 are each formed substantially flat. In the present embodiment, the object to be heated 100 is formed by casting an aluminum material. That is, the object 100 to be heated is an ingot. Therefore, in the object 100 to be heated, the bottom surface 103 is formed by so-called sink marks when the center portion of the object is cast. In addition, the length of the object to be heated 100 in the longitudinal direction is formed to be longer than the diameter of the table 201.

(Construction of electromagnetic induction heating device 200) The electromagnetic induction heating device 200 is a mechanical device for generating an induction current and heating the object to be heated 100, and mainly includes a table 201, a magnet 203, an electric motor 204, a proximity mechanism 210, a workpiece support 221, and a control device 230, respectively.

As shown in FIG. 5, the table 201 is a component for holding a plurality of magnets 203, and is formed of a plate-shaped body (hereinafter also referred to as “circular plate body”) that is circular in plan view. More specifically, the table 201 is formed with a plurality of bottomed holes that hold the magnet 203 in an exposed state on the disc body surface (the upper surface in the figure). In addition, the table 201 is provided with a shaft body 201a that extends from the center of the bottom surface (lower surface in the figure) of the circular plate to the downward direction in the figure, and is electrically connected to the shaft body 201a through a coupling 202 The output shaft of the motor 204.

The table 201 is composed of a paramagnetic body (such as aluminum, manganese, platinum, or glass) or an diamagnetic body (such as copper, gold, silver, zinc, lead, glass, or wood). In this embodiment, the table 201 is constituted by an aluminum disc body. In FIG. 5, the two-dot chain line shows the magnet 203 and the workpiece support 221 described later.

The magnet 203 is a component for generating an induced current in the object 100 to be heated, and is formed in a cylindrical shape. A plurality of magnets 203 are provided on the surface of the table 201. At this time, each magnet 203 is embedded in the table 201 in such a direction that the same magnetic pole (N pole in this embodiment) is exposed to each other on the plate surface side of the table 201. In addition, each magnet 203 is held in a state flush with the surface of the table 201.

In addition, the magnets 203 are arranged concentrically around the rotation driving center of the table 201, and are arranged at equal intervals along the circumferential direction of each concentric circle. At this time, the magnet 203 is formed outside the rotation driving center portion of the table 201. As described above, the reason why the magnet 203 is not arranged at the center of the rotary drive of the table 201 is that the speed of the rotary drive at the center of the rotary drive is slow, and the heating efficiency is low.

In addition, each magnet 203 may be held in a state deeper than the plate surface of the table 201, or each magnet 203 may be held in a state of protruding from the plate surface. In addition, the arrangement state of each magnet 203 can be appropriately determined according to the heating specifications of the object 100 to be heated, and of course is not limited to this embodiment. In addition, in the present embodiment, the magnet 203 uses a neodymium magnet, but magnets other than the neodymium magnet, such as various magnets such as ferrite, samarium cobalt, or alnico, may be used.

The electric motor 204 is a driving source for rotationally driving the table 201, and is constituted by a servo motor that is controlled and operated by a control device 230 described later. The electric motor 204 is supported by the proximity mechanism 210.

The proximity mechanism 210 is a mechanical device used to bring the table 201 and the electric motor 204 into or out of the object 100 to be heated, and mainly includes a motor support body 211, a linear guide rail 212, a guide rail support body 213 and The drive mechanism 214 is configured.

The motor support body 211 is a component for supporting the electric motor 204, and is formed by forming a metal material into an L shape. The motor support body 211 is supported by the drive mechanism 214 in a state of being connected to the rail support body 213 via the linear guide rail 212.

The linear guide rail 212 is a part for guiding the table 201 and the electric motor 204 in the direction approaching or away from the object 100 to be heated, the track provided on the guide rail support 213 and the motor support 211 and is composed of a sliding member that moves back and forth on the aforementioned track. The rail supporting body 213 is a component for supporting the rail constituting the linear rail 212, and is formed by forming a metal material into an L shape. At this time, in order to support the rail along the guide direction of the table 201 and the electric motor 204, the rail support body 213 is formed so as to extend along the guide direction. The rail support body 213 is supported by the outer support body 220.

The driving mechanism 214 is a mechanical device equipped with a driving source for displacing the table 201 and the electric motor 204 in a direction approaching or away from the object 100 to be heated. The driving mechanism 214 has an electric motor (such as an AC servo motor) not shown in the figure that is controlled by the control device 230, a jack that converts the rotational driving force of the electric motor into the vertical direction shown in the figure, and supports the jack on the outside The support body on the support body 220 is formed.

The outer support body 220 is used to support the parts of the approach mechanism 210 and the work support body 221, and is formed by assembling a metal rod-shaped body into a box shape. The outer support body 220 is provided with a top plate made of a plate-shaped body at the upper end portion shown in the figure, the plate-shaped body is formed with a through-hole through which the shaft body 201a of the table 201 penetrates, and a work support body is provided on the top plate 221.

The workpiece support 221 is used to support the parts of the object to be heated 100 on the table 201, and is arranged on the outside of the table 201 to support the object to be heated 100 on the surface of the table 201.体220上。 Body 220. At this time, the workpiece support 221 is provided at a position that supports the object to be heated 100 at a position offset radially outward with respect to the rotation driving center portion on the plate surface of the table 201. The workpiece support 221 is formed such that both ends of the object to be heated 100 are supported from below with the planar portion 101 facing downward, and V-shapes in which the both ends are fitted from above are formed.

The workpiece support 221 is provided with a temperature detector 222. The temperature detector 222 detects the temperature of the object to be heated 100 and outputs it to the control device 230.

The control device 230 is constituted by a microcomputer composed of a CPU, ROM, RAM, etc., which controls the overall operation of the electromagnetic induction heating device 200 in its entirety, and is heated by executing a heating process program not shown in the figure pre-stored in the memory device. Process the object 100 to be heated. Specifically, the control device 230 controls the operation of the electric motor 204 to rotate and drive the table 201, and controls the operation of the proximity mechanism 210 to control the position of the table 201 in the vertical direction in the figure.

The control device 230 includes an operation panel 231, which is respectively provided with an input device, a display lamp, and a liquid crystal display device. The input device is composed of a switch group that receives an operator command and inputs the control device 230. The indicator lamp displays the operating status of the control device 230. In addition, the control device 230 includes a power supply unit that receives power from an external power source and supplies it to various parts such as the electric motor 204 and the proximity mechanism 210 that require power. However, in the present invention, there is no direct connection, so descriptions thereof are omitted. In addition, the control device 230 may be accommodated in the metal case and installed on the outer side surface of the outer support 220, but may be installed at a position away from the outer support 220 by wire.

(Operation of the heated object 100) Next, the operation of the object to be heated 100 configured as described above will be described. This operation description explains the preliminary heating operation. As shown in FIG. 6, in the process of manufacturing aluminum products such as aluminum wheels, aluminum doors and windows, the object to be heated 100 of these raw materials is melted in the previous step of the melting furnace. The object 100 to be heated is heated to 400 to 500°C and softened.

First, the operator turns on the power of the electromagnetic induction heating device 200. At this time, the control device 230 executes a control program not shown in the figure to control the operation of the proximity mechanism 210 so that the table 201 is lowered and positioned at the position farthest from the object 100 to be heated.

Next, the operator performs a work placement step, which is to install the object to be heated 100 on the electromagnetic induction heating device 200. Specifically, the operator places the object 100 to be heated on the workpiece support 221 in the electromagnetic induction heating device 200. More specifically, the operator places both ends of the object to be heated 100 on the workpiece support 221 with the flat portion 101 of the object to be heated 100 facing the table 201. At this time, the workpiece supporting body 221 is composed of two inclined surfaces that open upward in a V-shape, so that the object to be heated 100 can be fitted and stably supported by the side surface 102 formed by the inclined surface of the object to be heated 100. In addition, the installation work of the object to be heated 100 may be performed directly by the operator with bare hands, or a mechanical device such as a robot arm that holds the object to be heated 100 and places it on the work support 221 may be used.

Next, the operator positions the magnet 203 with respect to the object 100 to be heated. Specifically, the operator operates the operation panel 231 to actuate the proximity mechanism 210, thereby positioning the table surface of the table 201 at a position closest to the flat surface portion 101 of the object to be heated 100 within a range not in contact. At this time, the electromagnetic induction heating device 200 is arranged to face the flat portion 101 of the object to be heated 100, so the distance between the two can be positioned so that the two are close to the position before contacting each other.

Next, the operator heats the object 100 to be heated. Specifically, the operator operates the operation panel 231 and instructs the control device 230 to execute the heat treatment program. In response to the command, the control device 230 drives the table 201 to rotate by actuating the electric motor 204. With this, the object 100 to be heated is rapidly heated by the induced current generated inside.

Here, the heating experiment results of the object 100 to be heated performed by the present inventors will be described. The present inventors prepared a plurality of sets of the heated object 110 and the heated object 120 as shown in FIG. 7 and FIG. 8 respectively; the heated object 110 has the same structure as the heated object 100, that is, on the The bottom surface forms the flat portion 101 and the bottom surface 103 does not form the flat portion 101, and the center portion is recessed into a concave shape; the object 120 to be heated also forms the flat portion 101 on the bottom surface 103 of the object 100 to be heated (Flatness is less than 1mm). The object 110 to be heated and the object 120 to be heated are each 5 kg. Next, as shown in FIG. 9, the operator, with respect to the object 110 to be heated and the object 120 to be heated, respectively arranges the bottom surfaces 103 opposite to the table 201 and heats them under the same conditions, Investigate the relationship between heating temperature and heating time.

In the graph shown in FIG. 9, the horizontal axis is the time since the table 201 starts rotating and driving, and the vertical axis is the temperature of the object 100 to be heated. As shown in FIG. 9, compared to the object 110 to be heated in which the flat portion 101 is arranged on the opposite side of the magnet 203 and the bottom surface 103 is arranged oppositely, the flat portion 101 and the magnet 203 are arranged oppositely in the invention The solution of the object 120 to be heated can be heated to a high temperature faster. Specifically, the object 120 to be heated reaches 400° C. in about 141 seconds after the table 201 starts to rotate and is heated to 500° C. in about 221 seconds. On the other hand, the object 110 to be heated reaches 400° C. in about 481 seconds after the table 201 starts to rotate and does not reach 500° C. even after 601 seconds.

Next, when the object to be heated 100 reaches a predetermined temperature, the operator stops heating the object to be heated 100 and takes it out by the electromagnetic induction heating device 200. Specifically, the operator operates the operation panel 231 and instructs the control device 230 to stop executing the heating process program. In response to the command, the control device 230 stops actuating the electric motor 204, thereby stopping the rotary driving of the table 201. With this, the operator can take out the object to be heated 100 on the workpiece support 221.

During the removal operation of the heated object 100, the operator can confirm the temperature of the heated object 100 displayed on the operation panel 231, and confirm that the heated object 100 reaches a predetermined temperature. Moreover, the operator can perform an experiment in advance to obtain the time when the object to be heated 100 reaches a predetermined temperature, and grasp whether the object to be heated 100 reaches the predetermined temperature by whether or not the predetermined time has passed. In addition, when the predetermined temperature is reached or the predetermined time elapses, the control device 230 may automatically stop operating the electric motor 204. In addition, the operation of taking out the object to be heated 100 may be performed directly by the operator with bare hands, or a mechanical device such as a robot arm that holds the object to be heated 100 and takes it out from the work support 221 may be used.

Next, the operator puts the object to be heated 100 taken out of the electromagnetic induction heating device 200 into the melting furnace, and then the molten object to be heated 100 is poured into a cast film to form a molded article such as an aluminum wheel. The processing process of the object to be heated 100 taken out by the electromagnetic induction heating device 200 is not directly related to the present invention, so its description is omitted.

Next, when heat-processing the new object 100 to be heated, the operator can arrange the new object 100 to be heated on the work support 221 in the same manner as described above. On the other hand, when the operator finishes the preliminary heating step, the power of the electromagnetic induction heating device 200 is turned off and the operation is ended.

As can be understood from the above operation description, according to the above embodiment, the object to be heated 100 used in the electromagnetic induction heating device 200 is formed with a planar portion 101, and the portion of the planar portion 101 that faces the magnets 203 of the table 201 is Since the rotating surfaces of the magnets 203 are parallel to each other and the flatness is 5 mm or less, the heating time of the object to be heated 100 can be shortened and the heating time can be made uniform.

In addition, the implementation of the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without exceeding the purpose of the present invention. In each modification shown below, the same components as those of the object 100 to be heated in the above-mentioned embodiment are denoted by symbols corresponding to the symbols described in the object to be heated 100, and the description thereof is omitted.

For example, in the above embodiment, in the object 100 to be heated, the flat portion 101 is formed on the surface (upper surface in FIG. 1) of the object 100 to be heated having a trapezoidal cross-sectional shape. However, the flat portion 101 only needs to be formed on a surface of the object to be heated 100 that can face the magnet 203 provided on the table 201. Therefore, the flat portion 101 can be formed on the side surface 102 and the bottom surface 103 of the object 100 to be heated, respectively.

Furthermore, in the above-described embodiment, in the object 100 to be heated, the flat portion 101 is formed on the entire surface of the upper bottom side (upper surface in FIG. 1) of the object 100 to be heated having a trapezoidal cross-sectional shape. However, the flat portion 101 only needs to be formed on a surface of the object to be heated 100 that can face the magnet 203 provided on the table 201. At this time, the rotational speed of the central portion of the rotary drive of the table 201 is slower than the radial outer side. Therefore, in the object 100 to be heated, the heating effect of the portion disposed opposite to the rotation driving center portion of the table 201 is relatively low.

Therefore, as shown in FIG. 10, in the object 100 to be heated, the portion arranged opposite to the rotation driving center portion of the table 201 may not form the flat portion 101 but form a rough surface portion 104 having a flatness lower than that of the flat portion 101, and A flat portion 101 is formed outside the rough surface 104. As a result, the object to be heated 100 can reduce the processing burden on the planar portion 101, and the rough surface 104 can be used as a space in which the batch number of the object to be heated 100, the name of the manufacturer, or the like is engraved. In addition, in FIG. 9, in order to make the difference between the rough portion 104 and the flat portion 101 more obvious, the flat portion 101 formed outside the rough portion 104 is hatched.

Furthermore, in the above-described embodiment, the object to be heated 100 is formed into a trapezoidal cone shape having a trapezoidal cross-sectional shape. However, the object to be heated 100 may be formed in a shape that can face the magnet 203 provided on the table 201 in the object to be heated 100. Therefore, the object to be heated 100 may be configured as a flat plate-like body in addition to a polygonal rod-like body having a square or triangular cross-sectional shape.

At this time, the object to be heated 100 may form a flat portion 101 on at least a part of the outer surface. However, in the present invention, even when the object to be heated 100 does not form the planar portion 101, the highest flatness portion on the outer surface of the object to be heated 100 is arranged as the planar portion 101 opposite to the magnet 203 of the table 201, thereby It can be improved to shorten the heating time of the object to be heated 100 and make the heating time uniform.

In addition, when the object to be heated 100 does not form the planar portion 101, as shown in FIG. 11, before the object 100 to be heated is processed by the electromagnetic induction heating device 200, a planar portion forming step may be performed to make the object 100 to be heated At least a part of the outer surface forms a flat portion 101. At this time, in the flat portion forming step, at least a portion of the outer surface of the object to be heated 100 where the flat portion 101 is not formed may be subjected to various machining processes such as cutting, forging, or rolling to form the flat portion 101.

In addition, in the above-described embodiment, the object to be heated 100 is configured as an ingot of aluminum product materials such as aluminum wheels and aluminum doors and windows. However, the object 100 to be heated may of course be an ingot used as a raw material for various products other than aluminum wheels or aluminum doors and windows (such as aluminum cylinder bodies, etc.). In addition, the object to be heated 100 may be a material of a paramagnetic body (such as aluminum, manganese, platinum, or glass) other than aluminum or a diamagnetic body (such as copper, gold, silver, zinc, lead, glass, or wood). constitute. In addition, the object 100 to be heated may be a semi-finished product that has been processed on raw materials before it becomes a finished product such as an aluminum wheel, aluminum doors, and windows. In this case, the flatness of the portion of the semi-finished product that faces the magnet 203 may be 5 mm or less.

Moreover, in the above-mentioned embodiment, the table 201 is formed in a disk shape. However, the table 201 may also be formed in a shape other than a circle (including a round shape) in plan view, such as a polygonal shape such as a square, triangle, or hexagon. At this time, the flat portion 101 may be formed as a flat surface parallel to the rotation surface driven by the table 201 or the magnet 203, and the flatness may be 5 mm or less.

In addition, in the above-described embodiment, the electromagnetic induction heating device 200 is configured to rotate and drive the table 201 with respect to the object 100 to be heated. That is, the electric motor 204 corresponds to the table driving means of the present invention. However, the electromagnetic induction heating device 200 may be configured so that the object to be heated 100 and the table 201 are relatively rotated and driven. Therefore, the table driving means can be provided to rotate and drive the object to be heated 100 relative to the table 201 to configure the electromagnetic induction heating device 200.

Furthermore, in the above embodiment, the flatness of the flat portion 101 is 5 mm or less. However, in this flatness system, the smaller the amount of gap, the higher the flatness, and the shorter the heating time and the more uniform the heating time of the object 100 to be heated. Therefore, the flatness of the flat portion 101 is preferably 3 mm or less, and more preferably 1 mm or less.

Moreover, in the above-mentioned embodiment, the cross section of the workpiece support 221 is formed in a V-shape, and the object 100 to be heated which becomes a trapezoidal cone is fitted from above. However, the workpiece support may be constructed so as to freely support the object to be heated 100 in a detachable manner. Therefore, the workpiece support 221 may be provided with a clamp mechanism that further presses the object to be heated from above or from the side in the state where the object to be heated 100 is placed. In addition, the workpiece support 221 may be configured such that the object 100 to be heated is supported while being moved on the table 201 like a conveyor belt.

100‧‧‧Object to be heated 101‧‧‧ Plane Department 102‧‧‧Side 103‧‧‧Bottom 104‧‧‧ rough face 110‧‧‧Object to be heated 120‧‧‧Object to be heated 200‧‧‧Electromagnetic induction heating device 201‧‧‧Workbench 201a‧‧‧Shaft 202‧‧‧Coupling 203‧‧‧ magnet 204‧‧‧Electric motor 210‧‧‧ Close to the organization 211‧‧‧Motor support 212‧‧‧Linear guide 213‧‧‧rail support 214‧‧‧ drive mechanism 220‧‧‧Outside support 221‧‧‧Workpiece support 222‧‧‧Temperature detector 230‧‧‧Control device 231‧‧‧Operation panel

FIG. 1 is a perspective view schematically showing an appearance structure of an object to be heated for an electromagnetic induction heating device according to an embodiment of the present invention. FIG. 2 is a perspective view schematically showing the appearance of the object to be heated for the electromagnetic induction heating device shown in FIG. 1 viewed from the opposite side of the vertical direction of the drawing. FIG. 3 is a front view schematically showing the structure of an electromagnetic induction heating device that heat-processes an object to be heated for the electromagnetic induction heating device shown in FIGS. 1 and 2. 4 is a block diagram of a control system that controls the operation of an electromagnetic induction heating device. FIG. 5 is a plan view schematically showing an appearance configuration of a magnet-equipped workbench constituting the electromagnetic induction heating device shown in FIG. 3. FIG. 6 is a flowchart showing the steps of the heating process of the object to be heated for the electromagnetic induction heating device of the present invention. 7 is a perspective view schematically showing the appearance structure of an object to be heated for an electromagnetic induction heating device for verifying the effect of the present invention, and a flat portion is not formed on the bottom surface. FIG. 8 is a perspective view schematically showing an appearance structure of an object to be heated for an electromagnetic induction heating device for verifying the effect of the present invention, and a flat portion is formed on the bottom surface. The graph of FIG. 9 shows the time (seconds) after the table starts to rotate and drive when the heating object for the electromagnetic induction heating device shown in FIG. 7 and the heating object for the electromagnetic induction heating device shown in FIG. 8 are respectively opposed to the table. ) Relationship with temperature changes. FIG. 10 is a perspective view schematically showing an appearance configuration of an object to be heated for an electromagnetic induction heating device according to a modification of the present invention. FIG. 11 is a flowchart showing the steps of the heating process of the object to be heated for the electromagnetic induction heating device according to another modification of the present invention.

100‧‧‧Object to be heated

102‧‧‧Side

103‧‧‧Bottom

Claims (8)

An object to be heated for an electromagnetic induction heating device. The object to be heated is composed of raw materials or semi-finished products heated and softened by an electromagnetic induction heating device in the steps up to the finished product. The aforementioned electromagnetic induction heating device has: Worktable, so that the magnetic poles of multiple magnets are arranged on the same plane; The table driving means drives the object to be heated to rotate relative to the table; and, The workpiece support supports the object to be heated while facing the magnets of the table; And by rotating and displacing the object to be heated opposed to the magnets and the table, an induction current is generated and heated in the object to be heated; The object to be heated has a flat portion, and a portion of the flat portion that faces the magnets of the table is a plane parallel to the rotation surface of the magnets and has a flatness of 5 mm or less. The object to be heated for the electromagnetic induction heating device as described in item 1 of the patent scope, wherein, The cross-sectional shape of the object to be heated is trapezoidal and extends in a rod shape; The flat portion is formed on a surface of the trapezoid-shaped object to be heated on the upper bottom side of the trapezoidal shape. The object to be heated as described in item 1 or item 2 of the patent application scope, wherein, The object to be heated is formed in a plate shape or a rod shape extending in the diameter direction of the rotation circle of the table, and a rough surface portion is formed, and the rough surface portion is a portion of the object to be heated that is opposed to the table, and The center portion of the worktable that rotates relatively does not form the plane portion; The flat portion is formed outside the rough portion. A method of heating the object to be heated uses an electromagnetic induction heating device, The aforementioned electromagnetic induction heating device has: Worktable, so that the magnetic poles of multiple magnets are arranged on the same plane; The table driving means drives the object to be heated in a plate or rod shape to rotate relative to the table; and, The workpiece support supports the object to be heated while facing the magnets of the table; And by rotating and displacing the object to be heated opposed to the magnets and the table, an induction current is generated and heated in the object to be heated; The heating method of the object to be heated is characterized in that The object to be heated is a raw material or a semi-finished product that is softened by heating with an electromagnetic induction heating device in the steps up to the finished product, and at least a part of the outer surface has a flat portion, and the flat portion is a plane parallel to the rotation surfaces of the magnets. Flatness is below 5mm; It also includes a workpiece arranging step in which the object to be heated is arranged on the workpiece support in such a manner that the flat portion of the object to be heated faces the magnets. The heating method of the object to be heated as described in item 4 of the patent application scope, wherein, The cross-sectional shape of the object to be heated is trapezoidal and extends in a rod shape; The flat portion is formed on a surface of the trapezoid-shaped object to be heated on the upper bottom side of the trapezoidal shape. A method of heating the object to be heated uses an electromagnetic induction heating device, The aforementioned electromagnetic induction heating device has: Worktable, so that the magnetic poles of multiple magnets are arranged on the same plane; The table driving means drives the object to be heated in a plate or rod shape to rotate relative to the table; and, The workpiece support supports the object to be heated while facing the magnets of the table; And by rotating and displacing the object to be heated opposed to the magnets and the table, an induction current is generated and heated in the object to be heated; The heating method of the object to be heated is characterized in that The object to be heated is a raw material or semi-finished product that is softened by heating with an electromagnetic induction heating device in the steps up to the finished product; And contains: The step of forming a flat portion is to form a flat portion on at least a part of the outer surface of the object to be heated, the flat portion being a plane parallel to the rotation surfaces of the magnets and having a flatness of 5 mm or less; and, The workpiece disposing step is to arrange the object to be heated on the workpiece support in such a manner that the flat portion of the object to be heated faces the magnets. The heating method of the object to be heated as described in item 6 of the patent scope, wherein, The cross-sectional shape of the object to be heated is trapezoidal and extends in a rod shape; The flat portion forming step is to form the flat portion on a surface of the trapezoid-shaped object to be heated of the trapezoid-shaped upper bottom side. An aluminum wheel manufacturing method using an electromagnetic induction heating device, The aforementioned electromagnetic induction heating device has: Worktable, so that the magnetic poles of multiple magnets are arranged on the same plane; The worktable driving means drives the rod-shaped object to be heated of the aluminum wheel to rotate relative to the worktable; and, The workpiece support supports the object to be heated while facing the magnets of the table; And by rotating and displacing the object to be heated opposed to the magnets and the table, an induction current is generated in the object to be heated and heated to soften it; The manufacturing method of the aluminum wheel is characterized in that The object to be heated has a flat portion on at least a part of the outer surface, and the flat portion is a plane parallel to the rotation surfaces of the magnets and has a flatness of 5 mm or less; It also includes a workpiece arranging step in which the object to be heated is arranged on the workpiece support in such a manner that the planar portion of the object to be heated faces the magnets.

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