JP7446188B2 - heating device - Google Patents

Description

The present invention relates to a heating device for heating an object to be heated, which is a mold made of metal.

Conventionally, for example, a heating device for heating metal such as a mold used for forging includes a coil-shaped conductive part that is conductive and formed into a coil shape, and a power source that supplies high-frequency power to the coil-shaped conductive part. An IH type heating device is known, and in this heating device, an eddy current is generated on the surface of the mold near the coiled conductive portion by bringing the coiled conductive portion to which high-frequency power is supplied close to the mold. This makes it possible to locally heat the location where the eddy current occurs (see Patent Document 1).
A heating device for heating metal molds used for other forgings has a flat flame surface and a plurality of flame ports formed on the flame surface, and uses a plurality of flames that burn fuel and combustion air. A heating device equipped with a surface combustion burner formed by flame ports is known, and this heating device heats the mold by forming flames in a plurality of flame ports with the flame surface facing the surface to be heated of the mold. By heating the target surface, the mold can be gradually heated from the vicinity of the target surface (see Patent Document 2).

Patent No. 6474263 JP 2018-83233 Publication

According to the technology disclosed in Patent Document 1, although it is possible to locally heat the metal near the coiled conductive part to a high temperature, the heating is limited to a localized area, so that the metal near the coiled conductive part cannot be heated. When transitioning from a heating state in which electricity is being applied to a non-heating state in which electricity is stopped, there is a problem in that the temperature drops in a short period of time due to heat conduction to the mold and heat radiation to the atmosphere.
In addition, even in a heated state, eddy currents do not occur in areas away from the coiled conductive part, so if the mold has a relatively large volume, There was a problem in that the parts were not sufficiently heated and it was difficult to heat the entire area substantially uniformly in a short time.

On the other hand, the surface combustion burner disclosed in Patent Document 2 has a flame surface corresponding to the area of the surface to be heated of the metal used in the mold etc., thereby heating the entire surface of the metal to be heated almost uniformly. Since the entire metal can be heated well, compared to IH, heat conduction from one part of the mold to another part is less likely to occur and temperature drop is less likely to occur when transitioning from a heated state to a non-heated state. There is.
However, if a mold has a narrow deep hole with a relatively small diameter and a deep depth, even if flame is injected into the narrow deep hole from the flame surface, the inside of the narrow deep hole is exhausted. In addition to interference occurring, incomplete combustion occurred at the bottom due to a lack of oxygen, causing the problem that the inside of the hole could not be sufficiently heated.

Here, for example, a configuration may be considered in which a heating device is provided that combines an IH type heating device and a burner, but it is possible to create a configuration that takes into consideration the influence of thermal damage caused by one heating device to the other heating device. was not known until now.

The present invention has been made in view of the above-mentioned problems, and its purpose is to shorten the entire metal as much as possible even if the metal to be heated has a relatively complicated shape. It is an object of the present invention to provide a heating device that can heat the inside of a narrow deep hole well, for example, while uniformly heating the inside of a narrow deep hole.

A heating device for achieving the above object is a heating device that heats an object to be heated as a mold made of metal, and its characteristic configuration is as follows:
a burner having a flat combustion part that burns fuel gas and combustion air to make at least a part of the flame surface flat;
Equipped with an IH type IH heater having a coil-shaped conductive part that is conductive and formed into a coil shape, and a power supply part that supplies high-frequency power to the coil-shaped conductive part,
An opening is provided in a part of the flat combustion part of the burner, and in a state where the flame surface of the burner is opposed to the surface to be heated of the object to be heated, the coil-shaped conductive part is formed in the opening. It is configured such that it can be inserted through from one side of the flame surface of the flat combustion section to the other side where the surface to be heated is present.

According to the characteristic structure described above, first of all, the burner can heat the object to be heated by the flat combustion part in which at least a part of the flame surface has a flat shape, so that the object to be heated can be heated by the object to be heated facing the flame surface. The surface of the object to be heated is heated in order, and the temperature of the object to be heated can be gradually increased from the vicinity of the surface to be heated.
However, if the mold as the object to be heated has a relatively complicated shape and has a narrow and deep hole, it is difficult to adequately heat the inside and bottom of the mold using only the burner.
Therefore, by providing an IH heater with a coil-shaped conductive part that can locally heat the surface of the object to be heated, the shape follows the complex shape of the object to be heated, such as a narrow and deep hole. Even if the shape is relatively complex and it is difficult to heat the whole part, that part can be heated well.
Furthermore, an opening is provided in a part of the flat combustion section, and when the flame surface of the burner is opposed to the surface of the object to be heated, the coil-shaped conductive section is connected to the flat combustion section through the opening. Since the part that supplies high frequency power to the coil-shaped conductive part of the IH heater can be inserted from one side of the flame surface of the part to the other side where the heated object surface is present, the part that supplies high frequency power to the coiled conductive part of the IH heater is located between the flat combustion part and the heated object surface. It is possible to avoid being disposed in a relatively narrow and high-temperature area between the heating target surface and suppress thermal damage caused by flame from the flame surface.
From the above, even if the metal to be heated has a relatively complicated shape, it is possible to uniformly heat the entire metal in the shortest possible time, and also to heat the inside of a narrow deep hole, for example. It is possible to realize a heating device that can heat the material satisfactorily.

Further characteristics of the heating device include:
The coil-shaped conductive portion includes an elongated conductive portion extending along the normal direction of the flame surface.

According to the characteristic structure described above, in the object to be heated, in the normal direction of the flame surface, the heating object is formed in a part away from the flame surface where heating by heat conduction is difficult to be performed, and on the surface of the object to be heated opposite to the flame surface. Even inside a narrow, deep hole, etc., localized heating can be achieved by inserting a long conductive portion.

Further features of the heating device include:
The IH heater includes a conductive part that extends from the power supply part in a direction along the flame surface of the flat combustion part and supplies the high-frequency power to the coiled conductive part, and a support that supports the conductive part. The point is that the members are provided.

Usually, the power source section is sensitive to heat, so it is preferable to provide it at a distance from the flat combustion section of the heater. However, when the power supply part and the flat combustion part of the heater are separated, the conductive part that supplies high-frequency power from the power supply part to the coiled conductive part is exposed to relatively high temperatures, which may reduce its rigidity and deform due to its own weight. There is a risk that
According to the characteristic structure described above, since the support member that supports the conductive part is provided, the shape of the conductive part, which is exposed to relatively high temperatures and may be deformed, can be maintained well.

Further characteristics of the heating device include:
The present invention is characterized in that it includes a cylindrical heat-insulating protection member made of a material having insulation and heat resistance, in which the conductive portion and the coil-shaped conductive portion are disposed.

According to the above characteristic structure, since the conductive part and the coil-shaped conductive part are surrounded by the cylindrical heat-insulating protection member containing a material having insulation properties and heat resistance, for example, it is formed in the flat combustion part of the heater. Thermal damage to the conductive part and the coiled conductive part due to the radiant heat of the flame can be effectively suppressed.
On the other hand, the coil-shaped conductive part does not use a direct heating method in which it radiates heat from itself, but uses an IH heating method in which it generates eddy currents to heat the metal in its vicinity. Even in the enclosed configuration, local heating of the object to be heated by the coiled conductive portion can be achieved satisfactorily.

Further characteristics of the heating device include:
A pair of combustion exhaust gas guiding parts each having a surface along a discharge direction of combustion exhaust gas discharged from the flat combustion part in the vicinity of the flat combustion part, the pair of combustion exhaust gas guiding parts are arranged so that the flat combustion part is It functions as a positioning section that positions the flat combustion section relative to the object to be heated when moving relative to the object to be heated.

According to the above characteristic structure, since the pair of combustion exhaust gas guiding parts are provided that have surfaces along the exhaust direction of the combustion exhaust gas discharged from the flat combustion part in the vicinity of the flat combustion part, the flow direction of the combustion exhaust gas can be controlled. It is possible to restrict the direction along the plane along the flame axis of the combustion exhaust gas guide part, and it is possible to improve the efficiency of heating the object to be heated by the combustion exhaust gas, compared to a case where the combustion exhaust gas is not restricted.
Further, it is preferable that the flat combustion part of the burner is disposed at a position where the surface of the object to be heated can be heated with high thermal efficiency.
According to the above-mentioned characteristic structure, since the above-mentioned combustion exhaust gas guiding section also takes on the positioning function of the flat combustion section with respect to the object to be heated, there is no need to replace the object to be heated at predetermined intervals. Also, the flat combustion section can be appropriately and quickly positioned with respect to the object to be heated.

Further characteristics of the heating device include:
The flat combustion part of the burner and the coiled conductive part of the IH heater are configured to be integrally movable with respect to the object to be heated,
The pair of combustion exhaust gas guide parts serving as the positioning parts are arranged so that when the flat combustion part and the coiled conductive part move relative to the object to be heated, the flat combustion part and the coiled conductive part is positioned relative to the object to be heated.

Similar to the above-described flat combustion section, it is preferable that the coil-shaped conductive section is properly inserted into and disposed in a narrow deep hole formed in the object to be heated.
According to the characteristic structure described above, since the combustion exhaust gas guiding section described above also has the function of positioning both the flat combustion section and the coiled conductive section with respect to the object to be heated, the object to be heated can be replaced at predetermined intervals. Even if it is necessary, both the flat combustion part and the coiled conductive part can be moved together, and both can be appropriately and quickly positioned relative to the object to be heated.

Further characteristics of the heating device include:
The heating start point of the burner is set before the heating start point of the IH heater.

Heating by the coil-shaped conductive part of an IH heater can locally heat the object to be heated, but due to heat conduction to the surroundings of the object and heat radiation to the atmosphere, after heating of the locally heated area stops. The problem is that the rate of temperature drop is high.
According to the above-mentioned characteristic structure, first, the entire object to be heated can be heated almost uniformly by the burner, and then heating by the coiled conductive part of the IH heater can be started, so that the entire object to be heated can be heated well. After heating, local heating of the inside of the narrow deep hole, etc. is performed, and in particular, the rate of temperature drop inside the narrow deep hole can be reduced, and substantially uniform preheating can be achieved in a short time.

Further characteristics of the heating device include:
The object to be heated as the mold is provided with an opening recessed from a surface facing the flame surface,
In the heated state by the IH heater, the coil-shaped conductive part is inserted into the opening.

According to the above characteristic structure, it is possible to satisfactorily raise and preheat the inside of the opening, which is relatively difficult to raise the temperature of by heating with a burner.

Further characteristics of the heating device include:
The flat combustion part has a first flame surface as the flame surface, and a second flame surface that discharges the combustion exhaust gas in a direction opposite to the direction in which the combustion exhaust gas is discharged from the first flame surface,
A first object to be heated as the object to be heated can be heated by the combustion exhaust gas from the first flame surface, and a second object to be heated as the object to be heated can be heated by the combustion exhaust gas from the second flame surface. The point is that it is configured to be able to heat an object.

According to the characteristic structure described above, generally, the first object to be heated as the lower mold of the mold and the second object to be heated as the upper mold can be simultaneously heated all at once by one flat combustion part. .

1 is a schematic configuration diagram including a partial cross-sectional view of a heating device according to an embodiment. It is a top view explaining the function of the positioning part which positions the flat combustion part and the coiled conductive part which concern on embodiment with respect to a metal mold|die. It is a figure showing the installation position of the temperature sensor with respect to a mold. FIG. 3 is a graph showing a change in mold temperature over time when heating is performed with an IH heater. FIG. 3 is a graph showing a change in mold temperature over time when heating is performed with a surface combustion burner. FIG. 2 is a graph diagram showing a change in mold temperature over time when heating is performed using an IH heater and a surface combustion burner.

The heating device 100 according to the embodiment of the present invention can heat the entire metal even if the metal as the object to be heated (in this embodiment, a mold) has a relatively complicated shape. The present invention relates to a device that can heat substantially uniformly in a short time and can also heat the inside of a narrow deep hole well, for example.
Hereinafter, an embodiment of the heating device 100 will be described based on FIGS. 1 to 6.

As shown in FIGS. 1 and 2, the heating device 100 according to the embodiment preheats a first object to be heated KG1 (an example of an object to be heated), which is a metal mold used for forging. Suitably used.
The heating device 100 includes a burner 20 that has a flat combustion part 21 that burns fuel gas and combustion air to form a flat first flame surface KM1 (an example of a flame surface), and a burner 20 that has a conductive coil-shaped The IH type IH heater 30 has a coil-shaped conductive part 36 formed into a shape, and a power supply part 31 that supplies high-frequency power to the coil-shaped conductive part 36. In a state where the opening K is provided and the first flame surface KM1 of the burner 20 is opposed to the first heated target surface KG1a (an example of the heated target surface) of the first heated target KG1, 36 can be inserted through the hole K from one side of the first flame surface KM1 of the flat combustion section 21 toward the other side where the first heated target surface KM1a is present (in the direction along the arrow Z in FIG. 1). It is composed of
Note that the combustion air may be oxygen-enriched air when increasing the temperature of the flame formed in the flat combustion section 21.

The burner 20 includes a fuel gas passage L1 having a first flow rate regulating valve V1 that adjusts the flow rate of fuel gas and a first check valve GV1 that prevents backflow of the fuel gas, and a first flow passage L1 that adjusts the flow rate of combustion air. A combustion air passage L2 having a second flow rate regulating valve V2 and a second check valve GV2 that prevents backflow of combustion air, and a fuel gas and combustion air passage L2 guided from the fuel gas passage L1. It has a venturi mixer BM that mixes combustion air guided from the venturi mixer BM, and an air-fuel mixture passage L3 that guides the air-fuel mixture mixed by the venturi mixer BM to the flat combustion section 21.
The burner 20 is configured as a so-called metal knit burner as a flat combustion burner, and the first flame surface KM1 of the flat combustion part 21 and its outer shape are similar to that of a mold in a plan view, as shown in FIG. It has a rectangular shape that is approximately the same shape as the first object to be heated KG1.
Note that the flat combustion section 21 in this embodiment has a second flame surface KM2 on a surface opposite to the first flame surface KM1, and a first heated surface disposed opposite to the first flame surface KM1. In addition to the object KG1, the second object to be heated KG2, which is a mold disposed facing the second flame surface KM2, can also be heated. That is, the flat combustion part 21 can heat the first object to be heated KG1 as a mold with the combustion exhaust gas from the first flame surface KM1, and can heat the second object to be heated by the combustion exhaust gas from the second flame surface KM2. It is configured to be able to heat the object KG2.
Although detailed illustrations are omitted, the flat combustion section 21 is provided with a pair of rectifying plates extending along the first flame surface KM1 and the second flame surface KM2, and the air-fuel mixture is disposed between the pair of rectifying plates. The air-fuel mixture is distributed and supplied approximately evenly to the first flame surface KM1 and the second flame surface KM2. A so-called metal knit is disposed on the first flame surface KM1 and the second flame surface KM2, and is configured to be able to radiate radiant heat substantially evenly in the normal direction of each surface.

As shown in FIG. 1, the IH heater 30 is provided with a conductive part 35 that is electrically connected to a coil-shaped conductive part 36, with one end and the other end being connected to the housing.
The conductive part 35 extends from the power supply part 31 in a direction along the first flame surface KM1 of the flat combustion part 21, and is bent in the normal direction of the first flame surface KM1 (direction of arrow Z in FIG. 1). It is electrically connected to a coiled conductive portion 36 having an elongated conductive portion extending along the coil. Note that the conductive part 35 and the coiled conductive part 36 can preferably be made of a hollow cylindrical member made of copper, and the cooling water CW guided from the cooling water passage L4 is continuously supplied inside the hollow cylindrical member. Flow is possible.
The conductive part 35 is supported at one end by a pair of copper supporting members 34 fixed to the housing of the power supply part 31 with a sixth nut N6. The other end of the pair of copper supporting members 34 extends along the longitudinal direction of the conductive part 35, and is connected to the conductive part 35 in a known configuration to suppress deflection of the conductive part 35 due to its own weight. ing.
The conductive part 35 and the coiled conductive part 36 are cylindrical heat-insulating protectors made of a material that has insulation and heat resistance and does not easily generate heat due to induction heating, in order to reduce the influence of radiant heat from the flat combustion part 21 of the burner 20. It is arranged inside the member 32.
To add an explanation, the heat insulation protection member 32 is composed of a horizontal portion 32a extending along the first flame surface KM1 of the flat combustion section 21, and a vertical portion 32c extending along the normal direction of the first flame surface KM1. ing.

The burner 20 and IH heater 30 that have been described so far move integrally in the horizontal direction with respect to the first heated object KG1 in order to periodically preheat the first heated object KG1 as a mold. configured to be possible.
Specifically, as shown in FIG. 1, the heating device 100 includes a truck 19 having horizontally movable wheels T, and a column extending vertically from the truck 19 (direction along arrow Z in FIG. 1). 10, a first support rod 11 that is supported by the support column 10 and extends in the horizontal direction and is connected to the flat combustion section 21, and a transformer 31a that is also supported by the support column 10 and extends in the horizontal direction. A support moving mechanism I having a second support rod 12 connected to a possible mounting table 13 is provided.
To explain further, the support moving mechanism I includes a first jig G1 and a first nut N1 that vertically position the first support rod 11 with respect to the support column 10, and also includes a first jig G1 and a first nut N1 that vertically position the first support rod 11 with respect to the support column 10. 11 in the horizontal direction. Further, it includes a third jig G3 and a third nut N3 for vertically positioning the second support rod 12 with respect to the column 10, and a fourth jig G3 and a third nut N3 for positioning the second support rod 12 in the horizontal direction with respect to the column 10. A jig G4 and a fourth nut N4 are provided.
Further, a lifting mechanism 37 for raising and lowering the transformer 31a with respect to the mounting table 13 is provided between the mounting table 13 and the transformer 31a placed on the thirteenth mounting table.
With the above configuration, by moving the cart 19 of the support moving mechanism I along the ground (not shown), the burner 20 and the IH heater 30 can be integrally attached to the first object to be heated KG1. Can be moved.
Further, as shown in FIG. 1, when the first heated object KG1 has a narrow deep hole HF (an example of an opening) extending in the vertical direction, in a plan view, the first heated object KG1 On the other hand, when the flat combustion part 21 of the burner 20 is located in an overlapping manner, in other words, the opening K of the flat combustion part 21 and the narrow deep hole HF of the first object to be heated KG1 overlap in plan view. By operating the lifting mechanism 37 when the coil-shaped conductive portion 36 is positioned at It can be inserted into HF.

Note that when the support movement mechanism I moves the burner 20 and the IH heater 30 integrally with respect to the first object to be heated KG1, both are appropriately positioned with respect to the first object to be heated KG1. It is preferable. Further, if the combustion exhaust gas from the first flame surface KM1 of the flat combustion section 21 is dispersed in the horizontal direction, it is not preferable from the viewpoint of thermal efficiency.
Therefore, in the heating device 100 according to the embodiment, as shown in FIGS. In the embodiment, a pair of combustion exhaust gas guide parts P are provided in which the flat combustion part 21 and the coiled conductive part 36 are arranged in the first covering. It functions as a positioning section for the flat combustion section 21 and the coil-shaped conductive section 36 when moving toward the heating target KG1.
To add an explanation, in this embodiment, as shown in FIGS. 1 and 2, the pair of combustion exhaust gas guide portions P connect the burner 20 and the IH heater 30 to the first heated object KG1 as a mold. It has a pair of guide surfaces Pb along the direction of movement (direction of arrow X in FIGS. 1 and 2) that move close to each other, and the exhaust direction of combustion exhaust gas is regulated in the direction of movement along the guide surfaces. Thermal efficiency can be improved compared to the case where the exhaust gas is diffused in all directions, such as the moving direction and the orthogonal direction (direction of arrow Y in FIGS. 1 and 2).
Furthermore, as shown in FIG. 2, the pair of guiding surfaces of the pair of combustion exhaust gas guiding parts P are installed at intervals along the side surface of the first object to be heated KG1 as a mold, so that The burner 20 and IH heater H30 that move along can be guided to a position where the heating state is achieved.
Note that the pair of combustion exhaust gas guide portions P are located at the base end in the direction of movement (direction of arrow X in FIGS. 1 and 2) in which the burner 20 and the IH heater 30 move close to the first object to be heated KG1 as a mold. A flange Pa is provided on the side, and positioning in the moving direction is performed by abutting the flange Pa against the first object to be heated KG1. After the positioning, the above-described lifting mechanism 37 is operated to insert the coiled conductive portion 36 from the outside to the inside of the narrow deep hole HF.
Note that in FIG. 1, the distance LH2 between the second heated object KG2 and the second flame surface KM2 is illustrated to be relatively small due to space limitations; however, when the burner 20 and the IH heater 30 are moved, The distance LH2 between the second heated object KG2 and the second flame surface KM2 is set to be sufficiently larger than the length of the coiled conductive portion 36 in the longitudinal direction.

Here, to add an explanation regarding the dimensional relationship, as shown in FIG. 1, when preheating the second heated object KG2, which is a secondary mold, in addition to the first heated object KG1, which is the main mold. , the conductive portion 35 along the first flame surface KM1 and the second flame surface KM2 of the IH heater 30 is located between the first heated object KG1 and the first flame surface KM1, or between the second heated object KG2 and the second flame surface KM1. It is possible to arrange it between the flame surfaces KM2.
However, normally, the first object to be heated KG1, which is the main mold, is more sensitive in the normal direction of the first flame surface KM1 and the second flame surface KM2 than the second object to be heated, KG2, which is the secondary mold. Considering the amount of heat required to preheat both objects, the distance LH1 between the first heated object KG1 and the first flame surface KM1 is longer than the distance LH1 between the second heated object KG2 and the first flame surface KM1. This means that the distance LH2 between the two flame surfaces KM2 should be larger.
Therefore, in this embodiment, the conductive portion 35 along the first flame surface KM1 and the second flame surface KM2 of the IH heater 30 is located between the second heated object KG2 and the second flame surface KM2, and between the second heated object KG2 and the second flame surface KM2. A configuration is adopted in which the influence of radiant heat from the burner 20 is reduced by arranging it at a position separated from the flame surface KM2.

Note that in the heating device 100 according to the embodiment, the heating start time of the burner 20 is set before the heating start time of the IH heater 30 from the viewpoint of heat radiation loss and thermal efficiency. This suppresses heating only by the IH heater 30, which increases heat radiation loss, reduces thermal efficiency, and lengthens the heating time.

Next, experimental results when the first object to be heated KG1 is heated using the heating device 100 according to the embodiment will be explained based on the graphs of FIGS. 4 to 6.
The temperature at each position inside the first object to be heated KG1 is measured by arranging temperature sensors CH1 to CH11, as shown in FIG. The changes in temperature over time are shown in the graphs of FIGS. 4 to 6. In each experiment, the heating device 100 was kept in a heating state from 0 seconds to 900 seconds.
Figure 4 shows the change in mold temperature over time when heating is performed with only the IH heater 30, Figure 5 shows the case where heating is performed with only the burner 20, and Figure 6 shows the change in mold temperature with time when heating is performed with the IH heater 30 and burner 20. FIG.

As can be seen from the comparison of the graphs in FIGS. 4 and 5, in the experimental results when heating only with the IH heater 30, from the measurement results of temperature sensors CH1 to CH5, especially in the vicinity of the entrance of the narrow deep hole HF, It can be seen that the larger the area of contact with the atmosphere is and the farther the distance from the coiled conductive part 36 to the first object to be heated KG1 is, the more difficult it is for the temperature to rise. On the other hand, it can be seen from the measurement results of temperature sensors CH6 to CH11 that the closer to the bottom of the narrow deep hole HF, the easier the temperature rises.
On the other hand, in the experimental results when heating was performed only with the burner 20, from the measurement results of the temperature sensors CH1 to CH5, it was found that the first flame surface KM1 of the flat combustion part 21, especially near the entrance of the narrow deep hole HF, It can be seen that the closer the temperature is, the easier it is to raise the temperature. On the other hand, the measurement results of the temperature sensors CH6 to CH11 show that the closer to the bottom of the narrow deep hole HF, the harder it is to increase the temperature.
Finally, as shown in FIG. 6, the experimental results when heating was performed using the burner 20 and the IH heater 30 revealed that the area in contact with the atmosphere is large near the entrance of the narrow deep hole HF, and At any location near the bottom of the HF, the temperature was approximately 150°C at the end of heating after 900 seconds.
It can be seen that the temperature can be increased above that.

[Another embodiment]
(1) Although the heating device 100 according to the above embodiment has been described as heating a mold used for forging, it can also be used for other heating purposes.

(2) The flat combustion part 21 in the burner 20 in the above embodiment has been shown as having a rectangular shape in plan view, but may have various shapes such as a circular shape in plan view depending on the shape of the mold. shape can be adopted.
Furthermore, the burner 20 in the above embodiment has been described using a metal knit burner as a surface combustion burner as an example. Another burner 20 is an annular burner in which a plurality of nozzle holes are provided for injecting flame toward one side and the other side of the surface where the ring of the mixture flow path is formed with respect to the annular mixture flow path. It doesn't matter. In the case of this configuration, the coil-shaped conductive portion 36 of the IH heater 30 is inserted through the center of the ring of the mixture flow path of the annular burner.

(3) In the above embodiment, the first flame surface KM1 and the second flame surface KM2 are provided along the horizontal direction (the direction along the arrows X and Y in FIG. 1), but the configuration is not limited to this. It is not something that will be done.
Further, the first support rod 11 and the second support rod 12 do not need to be supported in the horizontal direction, and may be supported at an arbitrary angle with respect to the support column 10.

(4) In the above embodiment, the support member 34 and the heat insulation protection member 32 do not necessarily need to be provided.

(5) In the embodiment described above, an example of a configuration in which the flat combustion part 21 and the coiled conductive part 36 are movable integrally is shown, but both can be moved independently of each other. It does not matter if it is configured as .

Note that the configuration disclosed in the above embodiment (including other embodiments, the same applies hereinafter) can be applied in combination with the configuration disclosed in other embodiments, as long as there is no contradiction, and The embodiments disclosed in this specification are illustrative, and the embodiments of the present invention are not limited thereto, and can be modified as appropriate without departing from the purpose of the present invention.

Even if the metal to be heated has a relatively complicated shape, the heating device of the present invention can heat the entire metal almost uniformly in a short time, and can heat the entire metal object in a short time, for example, in a narrow deep hole. It can be effectively used as a heating device that can heat the inside well as well.

20: Burner 21: Flat combustion section 30: IH heater 31: Power supply section 31a: Transformer 34: Support member 35: Conductive section 36: Coiled conductive section 100: Heating device H30: IH heater HF: Narrow deep hole K: Opening hole KG1: First object to be heated KG2: Second object to be heated KM1: First flame surface KM2: Second flame surface P: Combustion exhaust gas guiding part Pa: Flange part

Claims (9)

A heating device that heats an object to be heated as a mold made of metal,
a burner having a flat combustion part that burns fuel gas and combustion air to make at least a part of the flame surface flat;
Equipped with an IH type IH heater having a coil-shaped conductive part that is conductive and formed into a coil shape, and a power supply part including a transformer that supplies high-frequency power to the coil-shaped conductive part,
An opening is provided in a part of the flat combustion part of the burner, and in a state where the flame surface of the burner is opposed to the surface to be heated of the object to be heated, the coil-shaped conductive part is formed in the opening. A heating device configured to be able to be inserted through from one side of the flame surface of the flat combustion section to the other side where the surface to be heated is present. The heating device according to claim 1, wherein the coil-shaped conductive part includes an elongated conductive portion extending along the normal direction of the flame surface. The IH heater includes a conductive part that extends from the power supply part in a direction along the flame surface of the flat combustion part and supplies the high-frequency power to the coiled conductive part, and maintains the shape of the conductive part. The heating device according to claim 1 or 2, further comprising a support member. The heating device according to claim 3, further comprising a cylindrical heat-insulating protection member made of a material having insulation and heat resistance, in which the conductive portion and the coiled conductive portion are disposed. A pair of combustion exhaust gas guiding parts each having a surface along a discharge direction of combustion exhaust gas discharged from the flat combustion part in the vicinity of the flat combustion part, the pair of combustion exhaust gas guiding parts are arranged so that the flat combustion part is The heating device according to any one of claims 1 to 4, which functions as a positioning section that positions the flat combustion section with respect to the object to be heated when moving with respect to the object to be heated. The flat combustion part of the burner and the coiled conductive part of the IH heater are configured to be integrally movable with respect to the object to be heated,
The pair of combustion exhaust gas guiding parts as the positioning part are
Claim 5: When the flat combustion section and the coiled conductive section move relative to the object to be heated, the flat combustion section and the coiled conductive section are positioned relative to the object to be heated. The heating device described in . The heating device according to any one of claims 1 to 6, wherein the heating start time of the burner is set before the heating start time of the IH heater. The object to be heated as the mold is provided with an opening recessed from a surface facing the flame surface,
The heating device according to any one of claims 1 to 6, wherein the coil-shaped conductive part is inserted into the opening in the heating state by the IH heater. The flat combustion part has a first flame surface as the flame surface, and a second flame surface that discharges the combustion exhaust gas in a direction opposite to the direction in which the combustion exhaust gas is discharged from the first flame surface,
A first object to be heated as the object to be heated can be heated by the combustion exhaust gas from the first flame surface, and a second object to be heated as the object to be heated can be heated by the combustion exhaust gas from the second flame surface. The heating device according to any one of claims 1 to 8, configured to be able to heat an object.

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