JP5310440B2 - Induction heating dryer - Google Patents

Description

  The present invention relates to an induction heating drying apparatus that performs induction heating on an outer plate of each part of a vehicle body.

Conventionally, after painting a vehicle body such as an automobile, the vehicle body is transported into a drying furnace, and hot air generated by burning a burner in the drying furnace is blown by a fan to The body is heated and dried.
On the other hand, when drying using a drying furnace, the temperature distribution in the drying furnace becomes uneven, the coating surface is dried before the inner surface, and the coating quality is affected. There is a risk that dust may adhere to the surface.

On the other hand, for example, in the coating drying furnace of Patent Document 1, at least one electromagnetic induction heating coil is provided so as to face the rocker portion of the automobile body, and the coating film applied to the rocker portion is dried. It is disclosed. Thereby, the rolling-up of the foreign material by a hot air is suppressed, and the quality defect that a foreign material adheres to a coating film by extension is reduced.
Further, for example, in the electrodeposition coating film forming method of Patent Document 2, a coating film obtained by performing electrodeposition coating on a metal three-dimensional object such as an automobile body is selected by a plurality of induction heating devices. It is disclosed to heat and dry. As a result, it takes time to heat the coating film, part of it is overheated to bring the hot air temperature higher than the baking temperature, and the coating film deteriorates. The problem of not being able to paint and dry cure has been improved.

JP 2005-87819 A JP 2004-2965 A

  However, opening and closing parts such as doors, hoods, and back doors are attached to a vehicle body such as an automobile, and metal plates of different materials and compositions are used for the outer plates of each part constituting the vehicle body. It has been broken. For this reason, the specific resistance value differs depending on the material of the metal plate and the easiness of heating when performing induction heating is different, and there is a possibility that the entire vehicle body cannot be heated stably and substantially uniformly.

  The present invention has been made in view of such conventional problems, and even when there are materials having different specific resistance values depending on the material of the metal plate constituting the outer plate of each part of the vehicle body, the outer plate of each part. It is an object of the present invention to provide an induction heating drying apparatus that can stably heat and dry the material.

The present invention is an induction heating drying apparatus that performs induction heating on the outer plate of each part of a vehicle body assembled with an opening / closing part such as a door, and dries the surface of the outer plate of each part,
Having one or more induction heating coils for performing induction heating;
Any of the outer plates is constituted by a second metal plate having a different specific resistance value from the first metal plate constituting the remaining outer plate,
The energizing condition of the induction heating coil when heating the first metal plate is different from the energizing condition of the induction heating coil when heating the second metal plate, or the first metal plate and the second metal plate. The induction heating drying apparatus is characterized in that the metal plate is heated by the induction heating coils having different energization conditions (Claim 1).

The induction heating and drying apparatus of the present invention can stably and substantially uniformly heat the outer plate of each part even when a metal plate having a different material and composition is used for the outer plate of each part of the vehicle body. is there.
Specifically, the induction heating drying apparatus according to the present invention is configured so that the energization condition of the induction heating coil when heating the first metal plate is different from the energization condition of the induction heating coil when heating the second metal plate. Can be configured. Moreover, the induction heating drying apparatus of this invention can also be comprised so that a 1st metal plate and a 2nd metal plate may each be heated with the induction heating coil from which energization conditions differ.
By adopting one of the configurations, the outer plate of each part can be stably and substantially uniform even when there are materials with different specific resistance values depending on the material and composition of the metal plate constituting the outer plate of each part of the vehicle body. It can be heated to dry.

The induction heating and drying apparatus can be used for drying a coating film formed by coating the outer plate of each part of the vehicle body.
Moreover, the induction heating drying apparatus can also be used for evaporating the solvent applied to the outer plate of each part of the vehicle body. In the case of applying a solvent to the surface of the outer plate, for example, in order to inspect whether the surface of the outer plate is scratched, the solvent is applied to the surface of the outer plate and light is reflected on this surface. In some cases, the change in the reflection angle is observed. In this case, the solvent can be quickly evaporated by using an induction heating drying apparatus.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. Side explanatory drawing which shows the induction heating drying apparatus of the state which heat-drys with respect to the front side of a vehicle body and the front side of a side part in Example 1. FIG. Side explanatory drawing which shows the induction heating drying apparatus of the state which heat-drys with respect to the intermediate part of the top | upper surface part and side part of a vehicle body in Example 1. FIG. Side explanatory drawing which shows the induction heating drying apparatus of the state which heat-drys with respect to the back side of a vehicle body and the back side of a side part in Example 1. FIG. FIG. 3 is a perspective explanatory view showing another induction heating drying apparatus in a state where the vehicle body is heated and dried in the first embodiment. FIG. 9 is a perspective explanatory view showing an induction heating coil in a state where heat drying is performed on a vehicle body in the second embodiment. Side surface explanatory drawing which shows the induction heating drying apparatus of the state which heat-drys with respect to the vehicle body in Example 2. FIG.

A preferred embodiment of the above-described induction heating drying apparatus of the present invention will be described.
In the present invention, the specific resistance value refers to a value determined by a difference in material and composition between the first metal plate and the second metal plate constituting the outer plate. This specific resistance value varies depending on the difference in material such as a difference between a steel plate and an aluminum plate described later. Moreover, even if this specific resistance value is the same material, it may be considered that it varies depending on the composition.
Further, the outer plate of each part of the vehicle body includes an outer plate such as a fender, a roof, and a pillar as each part of the main body, and a door (side door) and a hood (bonnet) as the opening and closing unit assembled to the main body. This refers to outer panels such as roofs and back doors (trunk lids).

In addition, the first metal plate is a steel plate using iron, the second metal plate is an aluminum plate using aluminum, and at least one of the outer plates of the opening / closing part assembled to the vehicle body is the above It is preferable that the second metal plate is used, and the remaining part of the outer plate of each part of the vehicle body is made of the first metal plate.
In this case, according to the difference between the steel plate and the aluminum plate, the energization conditions by the induction heating coil can be changed, and the outer plate of each part can be stably heated and dried substantially uniformly.
Moreover, as a steel plate, it can be set as the steel plate for various motor vehicles, For example, a cold-rolled steel plate, a cold high-tensile steel plate, etc. can be used. As the aluminum plate, various aluminum alloy plates developed for automobiles can be used.

In addition, the induction heating coils are positioned on the left and right sides of the vehicle body, and a pair of side surface induction heating coils that respectively heat both side surfaces of the vehicle body, and the vehicle body are positioned at the center of the vehicle body. A center part induction heating coil for heating the front part, the top part and the back part of the body, and the center part induction heating coil is moved by a moving means to move the front part, the top part and the rear part. It can also comprise so that it may heat sequentially (Claim 2).
In this case, the induction heating coil can be appropriately arranged with respect to the vehicle body, and the entire outer plate of each part of the vehicle body is stably and substantially uniformly heated and dried by a small number of induction heating coils. be able to.

The induction heating coil includes a first induction heating coil that heats the first metal plate and a second induction heating coil that heats the second metal plate. It is preferable that the second induction heating coil is configured to be movable separately or integrally by a moving means.
In this case, the induction heating coil is divided in advance into a first induction heating coil for heating the first metal plate and a second induction heating coil for heating the second metal plate, and these are separated separately by the moving means. The outer plate of each part of the vehicle body can be heated by moving integrally. Therefore, the several induction heating coil from which the energization conditions differ corresponding to the difference in the material of the outer plate | board of each part can be comprised easily.

The induction heating coil is provided with a magnetic sensor for detecting whether the outer plate of each part is the first metal plate or the second metal plate, and receives the detection by the magnetic sensor. Preferably, the energizing condition of the induction heating coil when heating the first metal plate is different from the energizing condition of the induction heating coil when heating the second metal plate.
In this case, the magnetic sensor can easily detect which part of the outer plate of the vehicle body uses the second metal plate and which of the remaining part of the vehicle uses the first metal plate. . Therefore, the type of the outer plate of each part in the vehicle body can be directly detected to change the energization condition of the induction heating coil.

The induction heating coil is provided with a distance sensor for detecting the distance from the outer plate of each part, and the distance of the induction heating coil with respect to the outer plate of each part is adjusted by receiving the detection by the distance sensor. It is preferable to constitute so as to do (claim 5).
In this case, the distance of the induction heating coil with respect to the outer plate of each part of the vehicle body can be adjusted with high accuracy.
As the distance sensor, a non-contact type sensor such as a photoelectric sensor or an ultrasonic sensor can be used.

Further, the vehicle body is preferably configured to be conveyed to the installation position of the induction heating coil by line conveyance (claim 6).
In this case, the induction heating and drying device is installed in a line for painting the vehicle body, and the vehicle body flowing through this line is heated and dried after painting continuously with other painting processes. be able to.

Embodiments of the induction heating drying apparatus of the present invention will be described below with reference to the drawings.
Example 1
As shown in FIG. 1, the induction heating and drying apparatus 1 of this example performs induction heating on an outer plate (outer panel) of each part of a vehicle body 5 assembled with an opening / closing part 500 such as a door, and the outer plate of each part. The surface of is dried. The induction heating drying apparatus 1 has one or a plurality of induction heating coils 2 for performing induction heating.
In the vehicle body 5, any one of the outer plates of each part is constituted by a second metal plate 62 having a specific resistance value different from that of the first metal plate 61 constituting the remaining outer plate. The induction heating and drying apparatus 1 is configured so that the energization conditions of the induction heating coil 2 when heating the first metal plate 61 and the energization conditions of the induction heating coil 2 when heating the second metal plate 62 are different. is there.

Below, it demonstrates in detail with reference to FIGS. 1-4 about the induction heating drying apparatus 1 of this example.
The induction heating drying apparatus 1 of this example is used for heating the outer plate of each part of the vehicle body 5 after coating such as electrodeposition coating and heating and drying the coating film on the outer plate of each part. The vehicle body 5 is transported from the coating process to the drying process by a transport line.
Here, the outer plate of each part of the vehicle body 5 includes an outer plate such as a fender, a roof, and a pillar as each part in the main body 50, a door (side door) as an opening / closing part 500 assembled to the main body 50, and a hood. (Bonnet), roof, back door (trunk lid) and other outer plates.

  As shown in FIG. 1, the induction heating coil 2 is configured to apply an alternating voltage of a predetermined frequency and heat a metal outer plate by eddy current generated in the coil. The induction heating coil 2 can change energization conditions by changing a frequency, an alternating voltage, or the like. The induction heating coil 2 of this example is located on the left and right of the vehicle body 5, and is located at the center of the vehicle body 5 and a pair of side surface induction heating coils 2 </ b> A that respectively heat the side surfaces 51 of the vehicle body 5. The center portion induction heating coil 2B for heating the front surface portion 52, the top surface portion 53 and the back surface portion 54 of the vehicle body 5 and the bottom surface portion induction heating coil 2C for heating the bottom surface portion 55 of the vehicle body 5 are configured. The bottom surface induction heating coil 2C can be fixed to the floor surface of the transfer line.

The first metal plate 61 in this example is a steel plate using iron, and the second metal plate 62 is an aluminum plate using an aluminum alloy. In the vehicle body 5 of this example, the front part 52 (hood) and the back part 54 (back door) as the opening / closing part 500 are constituted by the second metal plate 62 made of an aluminum plate, and the remaining part of the outer plate of each part, that is, The side part 51 (side door, fender, pillar, etc.) and the top surface part 53 (roof) can be comprised from the 1st metal plate 61 which consists of a steel plate.
The side part induction heating coil 2A and the center part induction heating coil 2B are both attached to the effector part 41 of the industrial robot 4 as a moving means.

  As shown in FIGS. 2 to 4, the side part induction heating coil 2 </ b> A and the center part induction heating coil 2 </ b> B are configured to heat the outer plate of each part of the vehicle body 5 that is line-conveyed. The side part induction heating coil 2A and the center part induction heating coil 2B include a magnetic sensor 31 that detects whether the outer plate of each part is the first metal plate 61 or the second metal plate 62, and the outer plate of each part. And a distance sensor 32 for detecting the distance between the two.

The side part induction heating coil 2 </ b> A and the center part induction heating coil 2 </ b> B receive the detection by the respective magnetic sensors 31, and energization conditions for heating the first metal plate 61 and energization for heating the second metal plate 62. It is configured so that the conditions are different. Specifically, the second metal plate 62 has a lower specific resistance value than the first metal plate 61, so that it is difficult to reach a predetermined temperature. Therefore, each induction heating coil 2 </ b> A, 2 </ b> B is configured to make the frequency, applied voltage, etc. as energization conditions when heating the second metal plate 62 higher than when heating the first metal plate 61. .
In the vehicle body 5 of this example, when only the front surface portion 52 (hood) and the back surface portion 54 (back door) are configured from the second metal plate 62, the energization condition is changed only in the central induction heating coil 2B. Can be configured.

  Further, the side part induction heating coil 2A and the center part induction heating coil 2B are configured to receive the detection by the distance sensors 32 and adjust the distances of the respective parts to the outer plate. Specifically, the side part induction heating coil 2A or the center part induction heating coil 2B is moved by the movement of the effector part 41 of the industrial robot 4, and the vehicle body 5 The positional relationship with the outer plate of each part is configured to be a suitable positional relationship for induction heating.

2-4 is a figure which shows the state which heats the outer plate | board of each part of the vehicle body 5 one by one by the side part induction heating coil 2A and the center part induction heating coil 2B.
The central induction heating coil 2B is moved by the industrial robot 4, and the front surface portion 52 (hood) (see FIG. 2), the top surface portion 53 (roof) (see FIG. 3) and the back surface portion 54 (back) of the vehicle body 5. The doors (see FIG. 4) are sequentially heated. The side surface induction heating coil 2A includes a front side (front fender and front side door) (see FIG. 2) of the side surface 51 of the vehicle body 5, an intermediate portion (rear side door) of the side surface 51 (see FIG. 3), The rear side (rear fender) (see FIG. 4) of the side surface portion 51 is sequentially heated.

  As shown in FIG. 5, a plurality of side surface induction heating coils 2A can be arranged in the front-rear direction of vehicle body 5, and the energization conditions of each side surface induction heating coil 2A can be varied. In this case, 2 A of side part induction heating coils can be fixed to the floor surface of a conveyance line. And when the door as the opening / closing part 500 in the side part 51 is constituted by the second metal plate 62 and the part of the remaining side part 51 is constituted by the first metal plate 61, the side part for heating the first metal plate 61. The energization conditions of the induction heating coil 2A and the side surface induction heating coil 2A for heating the second metal plate 62 can be made different.

  The induction heating and drying apparatus 1 of this example can stably and substantially uniformly heat the outer plate of each part even when a metal plate having a different material and composition is used for the outer plate of each part of the vehicle body 5. Is. Specifically, the induction heating drying apparatus 1 of the present example can move the pair of side surface induction heating coils 2 </ b> A and the central portion induction heating coil 2 </ b> B separately by the industrial robot 4. As a result, the vehicle body 5 in the pre-painting process is moved while appropriately moving the pair of side surface induction heating coils 2A and the center induction heating coil 2B to the vehicle body 5 flowing through the transport line. The coating film applied to the outer plate of each part of 5 can be heated and dried.

  Further, by using the distance sensor 32, the distance of each induction heating coil 2 to the outer plate of each part of the vehicle body 5 can be adjusted with high accuracy. Thereby, the vehicle bodies 5 of a plurality of vehicle types flow through the transfer line, and each induction heating for the outer plates of the respective parts is also performed when the coating film applied to the outer plates of the respective parts of the vehicle bodies 5 of the plurality of vehicle types is heated and dried. The distance of the coil 2 can be appropriately controlled. In addition, by using the magnetic sensor 31, in the vehicle body 5, the outer plate of the portion where the first metal plate 61 is used and the outer plate of the portion where the second metal plate 62 is used are directly detected. Thus, the energization conditions of the center induction heating coil 2B can be changed.

  Therefore, according to the induction heating and drying apparatus 1 of the present example, even when there are materials having different specific resistance values depending on the material of the metal plate constituting the outer plate of each part of the vehicle body 5, the outer plate of each part is stabilized. Then, it can be heated and dried substantially uniformly.

(Example 2)
In this example, as shown in FIGS. 6 and 7, the first metal plate 61 and the second metal plate 62 constituting the outer plate of each part of the vehicle body 5 are connected to the first induction heating coil 2D and the second metal plate 62D having different energization conditions. It is the example comprised so that it might heat with 2 induction heating coil 2E, respectively.
The first induction heating coil 2D and the second induction heating coil 2E of this example are arranged with respect to the lifting device 7 as a moving means, and are lifted and lowered with respect to the vehicle body 5 flowing through the transport line. The outer plate of each part of the body 5 is configured to be heated and dried.

As for the outer plate of each part of the vehicle body 5, the front part 52 (hood) and the rear part 54 (back door) are composed of a second metal plate 62 made of aluminum, and the remaining part of the outer plate of each part is made of a steel plate. 1 metal plate 61 is used. In the lifting device 7, the first induction heating coil 2 </ b> D is disposed at a position facing the both side surface portions 51 and the top surface portion 53 of the vehicle body 5, and is positioned facing the front surface portion 52 and the back surface portion 54 of the vehicle body 5. The second induction heating coil 2E is disposed. The first induction heating coil 2D for heating the bottom surface portion 55 of the vehicle body 5 is disposed on the floor surface of the transport line.
And since the 2nd induction heating coil 2E which heats the 2nd metal plate 62 heats the aluminum plate which is hard to heat compared with a steel plate, the frequency, the applied voltage, etc. 1st induction heating which heats the 1st metal plate 61 It is set higher than the coil 2D.

In this example, the induction heating coil 2 is divided in advance into a first induction heating coil 2D for heating the first metal plate 61 and a second induction heating coil 2E for heating the second metal plate 62. The outer plate of each part of the vehicle body 5 can be heated by being moved (lifted / lowered) by the lifting / lowering device 7. Therefore, it is possible to easily configure a plurality of induction heating coils 2D and 2E having different energization conditions corresponding to differences in the material (specific resistance value) of the outer plate of each part.
Also in this example, other configurations are the same as those of the first embodiment, and the same effects as those of the first embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 Induction heating drying apparatus 2 Induction heating coil 2A Side part induction heating coil 2B Center part induction heating coil 2D 1st induction heating coil 2E 2nd induction heating coil 31 Magnetic sensor 32 Distance sensor 4 Industrial robot 5 Vehicle body 50 Main body 500 Opening / closing section 51 Both side sections 52 Front section 53 Top section 54 Back section 61 First metal plate 62 Second metal plate

Claims (6)

An induction heating drying apparatus that performs induction heating on the outer plate of each part of the vehicle body assembled with an opening / closing part such as a door, and dries the surface of the outer plate of each part,
Having one or more induction heating coils for performing induction heating;
Any of the outer plates is constituted by a second metal plate having a different specific resistance value from the first metal plate constituting the remaining outer plate,
The energizing condition of the induction heating coil when heating the first metal plate is different from the energizing condition of the induction heating coil when heating the second metal plate, or the first metal plate and the second metal plate. An induction heating drying apparatus characterized in that the metal plate is heated by the induction heating coils having different energization conditions. In Claim 1, the said induction heating coil is located in the left and right of the said vehicle body, is located in a center part of a pair of side part induction heating coil which each heats the both sides | surfaces of this vehicle body, and the said vehicle body And a center part induction heating coil for heating the front part, the top part and the rear part of the vehicle body,
The induction heating drying apparatus characterized in that the central induction heating coil is configured to move by a moving means to sequentially heat the front surface portion, the top surface portion, and the back surface portion. In Claim 1, the said induction heating coil is comprised from the 1st induction heating coil which heats the said 1st metal plate, and the 2nd induction heating coil which heats the said 2nd metal plate,
The induction heating drying apparatus, wherein the first induction heating coil and the second induction heating coil are configured to be movable separately or integrally by a moving means. 4. The magnetic sensor according to claim 1, wherein the induction heating coil is provided with a magnetic sensor that detects whether the outer plate of each part is the first metal plate or the second metal plate. Yes,
In response to detection by the magnetic sensor, the energization condition of the induction heating coil when heating the first metal plate is different from the energization condition of the induction heating coil when heating the second metal plate. A feature of the induction heating drying apparatus. In any one of Claims 1-4, the distance sensor which detects the distance with the outer plate | board of each said part is provided in the said induction heating coil,
An induction heating drying apparatus configured to adjust the distance of the induction heating coil with respect to the outer plate of each part upon receiving detection by the distance sensor.   The induction heating drying apparatus according to any one of claims 1 to 5, wherein the induction heating coil is configured to heat an outer plate of each part of the vehicle body that is conveyed in a line.

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