KR20180092593A - High-frequency induction heating system for automotive hood panel sealer bonding - Google Patents

Abstract

The present invention relates to a high-frequency induction heating system for sealer bonding of a vehicle′s hood which hardens a sealer applied between the outer and inner panels when manufacturing a vehicle hood. The high-frequency induction heating system for sealer bonding of a vehicle hood hardens a sealer applied to a hemming portion of the outer and inner panels of a vehicle hood, and comprises: a heating coil to heat the hemming portion; a high frequency generation unit to supply an alternating current to the heating coil; a transport unit to move the heating coil; a temperature sensor to measure the temperature of the hemming portion; a distance measurement sensor to measure the distance between the hemming portion and the heating coil; and a control unit to control the degree of movement of the transport unit in accordance with the distance measured by the distance measurement sensor, and control the output of the alternating current supplied by the high frequency generation unit in accordance with the temperature measured by the temperature sensor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a high frequency induction heating system for sealing a hood of a vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency induction heating system for sealing a vehicle hood, and more particularly, to a high frequency induction heating system for sealing a hood of a vehicle, in which a sealer applied between an outer panel and an inner panel, To a high frequency induction heating system.

A hood and a door of a vehicle are components to be opened and closed, and have a structure in which two panels (an outer panel and an inner panel) are bonded to each other.

Conventionally, an adhesive sealer 30 is applied between an outer panel 10 and an inner panel 20 as shown in FIG. 1, and then an edge of the outer panel 10 is bent The outer panel 10 and the inner panel 20 are joined. In addition, by heating the hemming region using the high frequency induction heating coil 40 connected to the heater main body (not shown), the adhesive sheet 30 is hardened so that the outer panel 10 and the inner panel 20 are firmly fixed .

However, in the case of a conventional high frequency induction heating apparatus, there is a problem in that the heating temperature varies greatly depending on the distance from the heating object. That is, in a conventional high frequency induction heater, a heating temperature difference of several hundred degrees (° C) or more is observed even in a distance of only a few millimeters (mm). In the case of a vehicle panel having a size of 500 × 300 mm or more in most cases, There is a problem that it is difficult to keep the heating temperature constant due to a distance error between the panel and the induction heating coil.

Korean Patent Publication No. 10-0314534

SUMMARY OF THE INVENTION It is an object of the present invention to provide a high-speed distance measuring sensor and a pneumatic system for sealing a hood of a vehicle, which maintains a constant distance between a panel to be worked and a high- And to provide a high frequency induction heating system.

According to the present invention, there is also provided a method of controlling an induction heating coil, comprising: measuring a temperature of a work part of a hood of a vehicle using a high-speed noncontact type temperature sensor; and controlling the AC current applied to the induction heating coil according to the measured temperature, Frequency induction heating system for sealing the hood of a vehicle which can keep the temperature of the hood at a constant level.

According to an embodiment of the present invention, there is provided a high frequency induction heating system for sealing a vehicle hood for curing a sealer applied to a hemming portion of an outer panel and an inner panel of a vehicle hood, Heating coil; A high frequency generator for supplying an alternating current to the heating coil; A transfer unit for moving the heating coil; A temperature sensor for measuring the temperature of the hemming site; A distance measuring sensor for measuring a distance between the heating portion and the heating coil; And a controller for controlling the degree of movement of the feeder according to the distance measured by the distance measuring sensor and controlling the output of the alternating current supplied by the high frequency generator according to the temperature measured by the temperature sensor.

Here, the temperature sensor may be a non-contact temperature sensor.

Also, the controller may calculate an error by comparing the temperature measured by the non-contact type temperature sensor with a preset reference temperature, and perform a PID compensation operation to calculate an output of the AC current using the calculated error value .

The transfer unit may be a pneumatic cylinder capable of expanding and contracting in a direction in which the hemming part is disposed.

The control unit may control the output of the alternating current by adjusting the frequency of the alternating current supplied by the high frequency generating unit.

According to another aspect of the present invention, there is provided a temperature control apparatus for controlling a temperature of an induction coil.

Embodiments of the disclosed technique may have effects that include the following advantages. It should be understood, however, that the scope of the disclosed technology is not to be construed as limited thereby, since the embodiments of the disclosed technology are not meant to include all such embodiments.

The high-frequency induction heating system for sealing the vehicle hood according to the present invention uses a high-speed distance measuring sensor and a pneumatic system to maintain a constant distance between the work panel and the high-frequency induction heating coil, The heating temperature can be maintained constant by applying the PID active control method of adjusting the alternating current applied to the induction heating coil according to the temperature of the part to be worked of the vehicle hood measured by using the temperature sensor.

1 is a view showing a high-frequency induction heater for a sealer joint of a conventional vehicle hood.
2 is a view illustrating a high-frequency induction heating system for sealing a vehicle hood according to an embodiment of the present invention.
3 is a schematic view illustrating a high frequency induction heating system for sealing a vehicle hood according to an embodiment of the present invention.
4 is a flowchart illustrating an operation of a high frequency induction heating system for sealing a vehicle hood according to an embodiment of the present invention.

The description of the disclosed technique is merely an example for structural or functional explanation and the scope of the disclosed technology should not be construed as being limited by the embodiments described in the text. That is, the embodiments are to be construed as being variously embodied and having various forms, so that the scope of the disclosed technology should be understood to include equivalents capable of realizing technical ideas.

Meanwhile, the meaning of the terms described in the present application should be understood as follows.

The terms " first, " " second, " and the like are used to distinguish one element from another, and the scope of the right should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" to another element, it may be directly connected to the other element, but there may be other elements in between. On the other hand, when an element is referred to as being "directly connected" to another element, it should be understood that there are no other elements in between. On the other hand, other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

It is to be understood that the singular " include " or "have" are to be construed as including the stated feature, number, step, operation, It is to be understood that the combination is intended to specify that it is present and not to preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

Each step may take place differently from the stated order unless explicitly stated in a specific order in the context. That is, each step may occur in the same order as described, may be performed substantially concurrently, or may be performed in reverse order.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the disclosed technology belongs, unless otherwise defined. Terms defined in commonly used dictionaries should be interpreted to be consistent with meaning in the context of the relevant art and can not be construed as having ideal or overly formal meaning unless expressly defined in the present application.

FIG. 2 is a block diagram showing a high frequency induction heating system for sealing a vehicle hood according to an embodiment of the present invention. FIG. 3 is a view schematically showing the operation of the induction heating system according to an embodiment of the present invention A high frequency induction heating system for sealing a vehicle hood according to the present invention includes a heating coil 100, a high frequency generating unit 200, a feeding unit 300, a temperature sensor 400, a distance measuring sensor 500, 600 and a temperature regulating unit 700. [

The heating coil 100 generates a high frequency magnetic field by receiving a high frequency current from the high frequency generator 200 and heats the hemming portion of the hood 1000 by the generated magnetic field. That is, the heating coil 100 receives an alternating current having a high frequency from the high frequency generating part 200 and induces heating by eddy current loss or the like on the hemming part of the vehicular hood 1000, which is a metal conductor.

At this time, the adhesive sealer applied between the outer panel and the inner panel of the automotive hood 1000 is heated by induction heating of the automotive hood 1000 to return to the state before curing, and thereafter, 1000 is cooled, the hardening temperature is reached, and the outer panel and the inner panel of the vehicle hood 1000 are firmly fixed. The adhesive sealer may be a component of a composition comprising 30% PVC resin, 30% CaCO3, 3% polyamide, 34% diisodecyl phthalate (DIDP) and the balance of impurities, but is not limited thereto.

On the other hand, when the adhesive sealer applied between the outer panel and the inner panel of the vehicle hood 1000 is a thermosetting material, it is heated in a short time by induction heating of the vehicle hood 1000, 1000) is firmly fixed to the outer panel and the inner panel.

The high frequency generating unit 200 receives a voltage from a power source (not shown) and supplies a high frequency alternating current to the heating coil 100 through a switching driving operation under the control of the controller 600. [ In particular, the high frequency generator 200 can supply the current of the output determined by the controller 600 to the heating coil 100. That is, the control unit 600 can increase the frequency of the alternating current applied by the high frequency generator 200 to increase the frequency of the alternating current applied to the heating coil 100, thereby increasing the heat energy induced by the heating coil 100.

The transfer unit 300 moves the heating coil 100 in the x-axis direction, the y-axis direction, and the z-axis direction in accordance with the control signal of the control unit 600. [ Here, the feeding unit 200 includes a feeding pneumatic cylinder for expanding and contracting in the vertical direction so as to move up and down the heating coil 100, and a feeding pneumatic cylinder for expanding and contracting in the horizontal direction to move the heating coil 100 in the x- and y- And may include a pneumatic cylinder for shrinking. In this case, the feed unit 300 may be a lead screw that is rotated in a forward and reverse direction by a feed motor and a feed motor. However, the feed unit 300 is not limited to this, and may be a voice coil motor Motor) may be used. Further, in the case where the transfer part 300 is a pneumatic cylinder that can expand or contract in the direction in which the hemming part of the vehicle hood 1000 is disposed, a cylinder sensor can be mounted for position feedback to the pneumatic cylinder. Such a cylinder sensor can provide information on the piston position of the pneumatic cylinder to the control unit 600. [

The temperature sensor 400 measures the temperature of the hemming site of the hood 1000 and transmits the measured temperature to the control unit 600. At this time, in the case of measuring the temperature by the high frequency induction heating, since the object to be measured is heated to several hundreds or more within a few seconds, the temperature sensor 400 is a high-speed noncontact type temperature sensor or a thermal imager desirable. It is preferable that the temperature sensor 400 is disposed at an upper portion or a lower portion near the hemming portion of the vehicle hood 1000 in order to improve the reliability of temperature measurement.

The control unit 600 calculates an error by comparing the temperature measured by the temperature sensor 400, in particular, the non-contact type temperature sensor with a preset reference temperature, and calculates an alternating current And a PID (Proportional Integral Differential) compensation operation for calculating an output of the PID.

The distance measuring sensor 500 measures the distance between the heating coil 100 and the hemming portion of the hood 1000 of the vehicle and outputs the measured distance to the controller 600. At this time, the distance measuring sensor 500 may be an overcurrent type digital displacement sensor capable of high-speed measurement or a non-contact type laser displacement sensor, but is not limited thereto.

The control unit 600 may be an external PC or the like that controls the overall operation of the high frequency induction heating system and provides various interfaces to the user as shown in FIG.

The control unit 600 controls the output of the alternating current supplied from the high frequency generator 200 according to the temperature measured by the temperature sensor 400. At this time, the control unit 600 increases the frequency of the alternating current supplied by the high frequency generating unit 200, thereby increasing the heat energy induced in the heating coil 100, The frequency of the alternating current may be reduced to reduce the heat energy induced in the heating coil 100. Here, the control unit 600 may adjust the heat energy induced in the heating coil 100 by adjusting the effective value of the alternating current supplied from the high frequency generating unit 200.

Meanwhile, the control unit 600 controls the degree of movement of the conveyance unit 300 according to the distance measured by the distance measurement sensor 500. At this time, when the transfer unit 300 is a pneumatic cylinder, the control unit 600 can receive the measured value from the cylinder sensor in the pneumatic cylinder and control the movement degree of the heating coil 100 more precisely.

In addition, the control unit 600 may receive the temperature range set by the user and adjust the output of the alternating current supplied from the high frequency generator 200 to maintain the temperature of the hemming site of the vehicle hood 1000 within the range have.

The temperature control unit 700 defines a space in contact with the induction coil 100, for example, a pipe-shaped space, and passes the temperature control medium such as water, a fluorine- Can be prevented from being heated. The temperature regulating unit 700 serves as a cooling coil for cooling the induction coil 100 so that even when the induction coil 100 is close to the hemming area of the automotive hood 1000, So as not to be damaged. 3, the high-frequency generating unit 200 may be implemented as a system equipment to supply a temperature control medium to the temperature controller 700 under the control of the controller 600 .

FIG. 4 is a flowchart illustrating an operation of a high frequency induction heating system for sealing a vehicle hood according to an embodiment of the present invention. Referring to FIGS. 1 to 4, The operation of the high frequency induction heating system will be described as follows.

First, the car hood 1000 having the hemming operation is transferred to the work space using the robot transfer system 1100 (S100). That is, the hemming part of the hood 1000 for a vehicle is disposed in the adjacent space of the heating coil 100 by the robot moving system 1100.

Next, the control unit 600 controls the distance measuring sensor 500 to measure the distance between the heating coil 100 and the hemming site of the hood 1000 (S200).

Thereafter, whether or not the distance measured by the distance measuring sensor 500 is within a predetermined range, for example, about 16 mm or more and 43 mm or less based on the case where the output of the high frequency generator 200 is about 5 kW to 10 kW (S300).

If the distance measured by the distance measuring sensor 500 is out of the predetermined range, the control unit 600 controls the feeding unit 300 to move the heating coil 100 and adjust its position (S400), the distance measuring sensor 500 is controlled to return to the step S200 of measuring the distance between the heating coil 100 and the hemming part of the vehicle hood 1000.

When the distance measured by the distance measuring sensor 500 is within the predetermined range described above, the controller 600 determines that the heating coil 100 is in the proper position, The temperature of the hemming portion of the vehicle hood 1000 is measured using the temperature sensor 400 after applying the alternating current to the heating coil 100 through the heating coil 201 at step S500. At this time, the controller 600 supplies the temperature regulating medium to the temperature regulating unit 700 through the cooling line 202 additionally connected to the high frequency generator 200, so that the heating coil 100 itself is heated to a high temperature Can be prevented.

Next, the controller 600 determines whether the temperature measured by the temperature sensor 400 is within a predetermined range (S600). If the measured temperature is within the predetermined range, the controller 600 controls the high- Does not adjust the output of the alternating current applied by the alternating current.

On the other hand, when the temperature measured by the temperature sensor 400 is outside the predetermined range, the controller 600 adjusts the output of the alternating current applied by the high frequency generator 200 by the PID compensation control method (S700 ), The temperature measured by the temperature sensor 400 is continuously checked.

In addition, even if the temperature measured by the temperature sensor 400 is within the predetermined range, the controller 600 can control the temperature of the sealer to be maintained at a predetermined temperature, for example, The temperature can be continuously measured by the temperature sensor 400 so that the temperature can be maintained and the output of the alternating current applied by the high frequency generator 200 can be adjusted by the PID compensation control method.

Although the disclosed method and apparatus have been described with reference to the embodiments shown in the drawings for illustrative purposes, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. I will understand that. Accordingly, the true scope of protection of the disclosed technology should be determined by the appended claims.

100: Heating coil
200: High frequency generating unit
300:
400: Temperature sensor
500: Distance measuring sensor
600:
700: Temperature control unit
1000: Car hood
1100: Robot transfer system

Claims (6)

A high frequency induction heating system for sealer bonding of a vehicle hood for curing a sealer applied to a hemming portion of an outer panel and an inner panel of a vehicle hood,
A heating coil for heating the hemming portion;
A high frequency generator for supplying an alternating current to the heating coil;
A transfer unit for moving the heating coil;
A temperature sensor for measuring the temperature of the hemming site;
A distance measuring sensor for measuring a distance between the heating portion and the heating coil; And
And a control unit for controlling the degree of movement of the conveyance unit according to the distance measured by the distance measuring sensor and controlling the output of the alternating current supplied by the high frequency generator in accordance with the temperature measured by the temperature sensor, Frequency induction heating system.
The method according to claim 1,
Wherein the temperature sensor is a non-contact type temperature sensor for sealing the hood of a vehicle.
The method of claim 2,
Wherein,
A non-contact type temperature sensor for measuring a temperature of the non-contact type temperature sensor to a preset reference temperature, and calculating an output of the alternating current by using the calculated error value; Induction heating system.
The method according to claim 1,
The transfer unit
Wherein the pneumatic cylinder is a pneumatic cylinder capable of expanding and contracting in a direction in which the hemming portion is disposed.
The method according to claim 1,
Wherein the control unit controls the output of the alternating current by adjusting the frequency of the alternating current supplied by the high frequency generating unit.
The method according to claim 1,
Further comprising a temperature regulator for defining a space in contact with the induction coil and supplying the temperature regulating medium into the space.

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