KR101167840B1 - A curved surface processing apparatus for thick plate using of high frequency induction heating by controlling automatic positioning of the coil - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thick plate bending machine using high frequency induction heating by coil position automatic precision control.

The apparatus for processing a thick plate using high frequency induction heating by automatic coil position automatic precision control according to the present invention includes a power plate 100, a frame 200 supporting a plurality of parts, and a thick plate seated on a work table 210. (P) via a heating means 300 for performing high frequency induction heating, a transfer means 400 for guiding the movement of the heating means 300 or the work table 210, and one side of the heating means 300. It comprises a cooling heat exchanger 500, and the control means 600 for controlling the operation of the heating means 300, the transfer means 400 and the heat exchanger (500). According to such a configuration, the processing time and power consumption is significantly reduced, and unlike the conventional gas torch type on-line heating method, there is an advantage in that it is environmentally friendly, productivity, and electrical efficiency are improved because no gas is used as a heat source.

Marine, Thick Plate, High Frequency, Induction Heating, Curved Machining

Description

A curved surface processing apparatus for thick plate using of high frequency induction heating by controlling automatic positioning of the coil}

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a state diagram of use of a thick plate bending machine according to the prior art;

2 is a use state diagram of another thick plate bending machine according to the prior art;

3 is a perspective view showing a curved plate processing apparatus of a thick plate using high frequency induction heating according to the present invention.

Figure 4 is a front view showing a curved plate processing apparatus of a thick plate using high frequency induction heating according to the present invention.

Figure 5 is a perspective view of the heating means in the processing apparatus of the thick plate using high frequency induction heating according to the present invention.

Fig. 6 is a partially enlarged view showing a transformer which is a main component of a heating means in a curved processing apparatus of a thick plate using high frequency induction heating according to the present invention;

7 is a front view showing the configuration of a preferred embodiment of a transformer.

8 is a side view showing the configuration of a preferred embodiment of a transformer.

Fig. 9 is a longitudinal sectional view showing a configuration of a spacing holding structure, which is one configuration in a thick plate bending machine using high frequency induction heating according to the present invention;

10 is a heat transfer analysis result of the thick plate of the thick plate using the processing apparatus of the thick plate using high frequency induction heating according to the present invention.

Fig. 11 is a schematic diagram showing a heat transfer analysis position at the time of bending a thick plate using a thick plate bending machine using high frequency induction heating according to the present invention;

12 is a graph showing a heat transfer analysis result for a heating line direction function at the position of FIG. 11;

Explanation of symbols on the main parts of the drawings

100. Power supply means 200. Frame

210. Workbench 220. Support

300. Heating means 320. Transformer

322.Core 324. Coil

340. Control Box 360. End Connections

362. Euro 364. Cooling Pipes

380. Spacing zone 382. Joint

384. Elastic generators 385. Elastic members

386. Ball 388. Height adjustment

389. Fasteners 400. Means of transport

420. Left and right feeder 440. Front and rear feeder

460. Shanghai Song 500. Heat Exchanger

600. Control means P. Plate

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thick plate bending machine using high frequency induction heating by coil position automatic precision control.

The shipyards design the alignment to have the optimum driving performance by considering the cargo load, speed and fuel consumption rate to meet the purpose of the ship and the requirements of the owner.

Thus, the outer shell of the hull is composed of many three-dimensional curved surfaces. The hull shell, defined by the linear design, is divided into about 100-300 shells through a landing process.

Many of these shells are made of thick plates to increase the durability of the vessel, and more than 70% of the outer shell is made of curved surfaces.

Conventionally, the thick plate is processed by using a variety of processing equipment such as rollers and presses.

Korean Patent Laid-Open Publication No. 10-2009-0093657 discloses a "hulling shell forming apparatus using a method for calculating the multi-point press position information for forming the hull shell," and a schematic state diagram of use is shown in FIG.

However, there is a problem in forming the outer plate 10 of the hull using the multi-point press 20.

That is, when the surface processing is performed by using the press 20, a large amount of deformation occurs initially, and since there are many process variables such as the molding position and the molding depth, the precision of the curvature greatly depends on the skill of the operator. There is a problem.

Accordingly, in recent years, a hot working method using linear heating for processing the outer shell of a hull into a curved surface has been applied.

This conventional technique uses the principle of generating plastic deformation in the thick plate through the tension and compression of the plate while undergoing a process of intensive heating and cooling a certain region of the plate using a gas torch, as shown in FIG. do.

That is, a plurality of gas torch 40 is provided on the rear plate 30 for the curved processing, and the plurality of gas torches 40 are disposed to be spaced apart in a straight line to radiate the flame downward.

However, the hot working method has a problem in that the material of the thick plate 30 is deteriorated due to the locally high heat applied to the thick plate 30, and affects work such as heating direction, speed, heat input amount, cooling method, thickness of plate, and the like. There are many factors that make it difficult to control the required curvature of thick plates.

In addition, although efforts for automation are continuously being progressed, they have not been put to practical use, and there is a problem in that the construction of the heat deformation database and the control of heat deformation are difficult.

Therefore, an object of the present invention for solving the above problems, the use of high frequency induction heating to significantly reduce the process time, while the processing of the back plate of the steel plate using the high-frequency induction heating by automatic precision control of the coil position to enable the processing of the thick plate It is to provide a processing apparatus.

Another object of the present invention is to optimize the shape and arrangement of the heating coil to enable rapid heating, and to provide automatic control of the coil position to improve workability and productivity by providing a conveying means to enable three-dimensional movement of the heating coil. It is an object of the present invention to provide a processing apparatus for a thick plate using high frequency induction heating.

In order to achieve the above object, the apparatus for processing thick plates using high frequency induction heating according to the present invention is characterized by performing high frequency induction heating on a power plate, a frame supporting a plurality of parts, and a thick plate seated on a work table. It comprises a heating means, a conveying means for guiding the movement of the heating means or work table, a heat exchanger for cooling via one side of the heating means, and a control means for controlling the operation of the heating means, the conveying means and the heat exchanger. It is characterized by.

The conveying means is characterized in that the heating means is guided to be movable in three dimensions with respect to the thick plate.

The heating means includes a transformer positioned under the heating means for induction heating the thick plate, a control box for controlling the output size of the high frequency current by receiving power from the power supply means, and the control box and the transformer electrically It characterized in that it comprises a connector for connecting.

The transformer is characterized in that it comprises a coil for generating an alternating flux by receiving a high frequency current from the control box, and a core for receiving the coil therein.

The coil is characterized in that it is formed by bending a bar having a rectangular cross section a number of times.

The coil is bent to open in one direction.

The core is characterized in that formed of a plurality of silicon steel sheet.

Cooling the transformer and the connector at the same time characterized in that.

The transformer, the control box and the connector are integrally coupled and move simultaneously.

The connector is formed by bending a metal plate a plurality of times, characterized in that the flow path is formed on one side via the cooling water provided from the heat exchanger.

The outer side spaced apart from the transformer is characterized in that the gap holding region for limiting the separation distance between the transformer and the rear plate by rolling motion in contact with the rear plate.

The conveying means is characterized in that it comprises a shanghai sending portion for allowing the heating means to linearly reciprocate in the height direction of the frame.

According to this configuration, there is an advantage that the processing time and power consumption is significantly reduced, thereby improving productivity and electrical efficiency.

Hereinafter, with reference to the accompanying Figures 3 and 4 will be described the configuration of the curved plate processing apparatus using a high frequency induction heating according to the present invention.

FIG. 3 is a perspective view of a thick plate processing apparatus (hereinafter referred to as a 'bending apparatus') using high frequency induction heating according to the present invention, and FIG. 4 is a curve of a thick plate using high frequency induction heating according to the present invention. A front view showing the processing apparatus is shown.

As shown in the drawing, the curved processing device according to the present invention is a device for processing a thick plate by induction heating to have a curved surface.

To this end, the grain processing apparatus, the power supply means 100, the frame 200 for supporting a plurality of parts, and the heating means 300 for performing high frequency induction heating on the back plate (P) seated on the work table 210 And, the transfer means 400 for guiding the movement of the heating means 300 or the work table 210, the heat exchanger 500 for cooling via one side of the heating means 300, and the heating means 300 , Control means 600 for controlling the operation of the transfer means 400 and the heat exchanger 500 is configured.

The power supply means 100 is a configuration for supplying power to the heating means 300 so that high frequency induction heating can be carried out, in the embodiment of the present invention generates a high frequency of up to 20 Hz, the output of 100 Hz It has a capacity and is configured to be heated up to 1000 ℃.

The frame 200 is located on the left side of the power supply means 100. The frame 200 supports a plurality of parts, and the work table 210 is provided at the front to allow the rear plate P to be seated.

Looking in more detail, the work table 210 is coupled to a plurality of rods to each other to form a space therein so that the heating means 300 can be supported in a suspended state.

The frame 200 is provided with a conveying means 400. The conveying means 400 is configured to guide the heating means 300 to move in three dimensions with respect to the rear plate (P), the heating means 300 is based on the frame 200 in the left / right direction and The linear reciprocating motion in the up / down direction is possible, and the linear reciprocation motion in the forward / rear direction of the work table 210 is enabled.

That is, the transfer means 400 is coupled to the heating means 300 and is mounted on the upper surface of the frame 200 to support the load of the heating means 300, the linear support reciprocating linearly in the left / right direction The left and right conveying unit 420 forcing the movement, the front and rear conveying unit 440 for forcing the forward / backward movement by supporting the lower surface of the work table 210 upward, and the heating means 300 for the support 220 It is configured to include a shanghai conveying unit (reference numeral 460 of Fig. 5) forcing the up / down conveying of).

The left and right transfer unit 420 and the front and rear transfer unit 440 includes a rail, a guide, and a motor forcing a linear reciprocating motion of the guide, and the shanghai transfer unit 460 has a screw and a cam applied thereto.

The heat exchanger 500 is provided at the rear side of the frame 200. The heat exchanger 500 is configured to circulate cooling water so that the heating means 300 is cooled, and may include a storage tank for storing the cooling water and a pump for forcibly circulating the cooling water stored in the storage tank. have.

The control means 600 is provided on the right side of the frame 200. The control means 600 is for controlling the operation of the heating means 300, the transfer means 400 and the heat exchanger 500, the heating temperature of the thick plate (P) to be heated by the heating means 300, heating It is configured to control the driving of the transfer means 400 for the transfer of the means 300 or the work table 210, the flow rate of the cooling water circulation of the heat exchanger 500, and the like.

On the other hand, the left side of the control means 600 is provided with a heating means 300 which is a main component of the present invention. The heating means 300 is a configuration for induction heating the thick plate (P) by receiving power from the power supply means 100, a detailed configuration of the heating means 300 will be described with reference to FIGS. do.

Figure 5 is a perspective view showing a heating means 300 in the thickening apparatus of the thick plate using the high frequency induction heating according to the present invention, Figure 6 is heating in the curved processing apparatus of the thick plate using the high frequency induction heating according to the present invention A partially enlarged view is shown showing the transformer which is the principal component of the means 300.

First, as shown in FIG. 5, the heating means 300 is located below the heating means 300, and a transformer 320 for induction heating the thick plate P and power from the power supply means 100. It comprises a control box 340 for controlling the output size of the high-frequency current, and the connector 360 for the control box 340 and the transformer 320 is electrically connected.

The transformer 320 is the most important configuration among the various configurations of the heating means 300, the coil 324 formed of a ferrite having a shape that is bent in one direction by bending a silicon steel rod having a rectangular cross section a number of times, and the coil And a core 322 that houses 324 therein.

The connector 360 is provided above the transformer 320. The connector 360 is formed by bending a plurality of metal plates, and when viewed from the front, the center part is bent to have an approximately 'c' shape, and the transformer 320 is electrically connected to a lower end part.

In addition, the upper rear end of the connector 360 is electrically connected to the control box 340. Therefore, the connector 360 serves to electrically connect the control box 340 and the transformer 320.

In addition, the connector 360, the control box 340, and the transformer 320 are integrally coupled and movable at the same time. That is, as described above, the supporter 220 is supported on the frame 200 so as to linearly reciprocate, and the load of the control box 340 is supported on the supporter 220.

Therefore, when the control box 340 is moved in accordance with the transport of the support 220, the connector 360 and the transformer 320 is a linear reciprocating movement in the left / right direction relative to the frame 200. .

The flow path 362 is provided on the surface of the connector 360. The flow path 362 is configured to allow the coolant cooled by heat exchange while passing through the heat exchanger 500 to pass through the connection hole 360. The flow path 362 has an empty tubular shape and is bent several times. It is attached to the outer surface of the connector 360.

Therefore, the coolant flowing along the flow path 362 may absorb and heat the heat of the connector 360.

On the other hand, the heat exchanger 500 also performs the role of cooling the heating means 300 at the same time. That is, the cooling water passing through the heat exchanger 500 is configured to circulate along the cooling pipe 364 installed to pass through the heating means 300.

More specifically, as shown in FIGS. 7 and 8, the cooling pipe 364 is connected to communicate with the inside of the core 322 so that the cooling water may be cooled by heat exchange while passing through the transformer 320.

In addition, the cooling pipe 364 may be branched into a plurality of branches as shown in FIG. 5 to be coupled to communicate with the flow path 362 and the transformer 320.

An outer space holding portion 380 is provided on the outside of the transformer 320. Four space keeping 380 is provided on the outside of the transformer 320 so as to be spaced apart from each other, and serves to limit the separation distance between the rear plate (P) and the transformer (320).

9 is a detailed configuration of the spacing 380. As shown in the drawing, the gap retaining zone 380 is located at the side of the heating unit 300 and fixed to the upright with respect to the ground, and is located below the coupling portion 382 and the rear plate (P) and optional It includes an elastic generating portion 384 for generating an elastic restoring force at the time of contact and a height adjusting portion 388 for height adjustment of the elastic generating portion 384.

The coupling portion 382 is coupled to the height adjustment unit 388 and the lower end, a space is formed inside the height adjustment unit 388 to enable the up / down linear movement of the elastic generating unit 384 ( See the right figure of FIG. 9). Then, the fastener 389 is provided through the right side surface of the height adjustment unit 388.

Accordingly, the outer surface of the elastic generator 384 may be pressed by the rotation of the fastener 389 so that an insertion depth into the height adjusting unit 388 may be fixed.

An elastic member 385 is provided inside the elastic generator 384, and a ball 386 is rotatably constrained under the elastic member 385. Therefore, the ball 386 is located at the lowermost side of the spacing 380 to be in contact with the rear plate (P), and pushes upwards as the contact pressure with the rear plate (P) increases, the elastic member ( 385) is configured to generate elastic restoring force.

Therefore, when the ball 386 is transported by the action of the front and rear conveying unit 440, the movement of the rolling along the upper surface of the back plate (P) to prevent the defect such as being stamped on the back plate (P) in advance. To help.

Hereinafter, with reference to the accompanying Figures 10 to 12 will be described the experimental results using the processing apparatus configured as described above.

Figure 10 shows the results of heat transfer analysis of the thick plate of the thick plate using the high-frequency induction heating apparatus according to the present invention, Figure 11 shows a thick plate processing apparatus using the high frequency induction heating according to the present invention A schematic diagram showing the heat transfer analysis position of the used thick plate during the bending process is shown, and FIG. 12 is a graph showing the heat transfer analysis result for the heating line direction function at the position of FIG. 11.

First, in the experiment for the present invention, a thick plate (P) of the SS400 material having a size of 17mm x 300mm x 500mm was used, the core 322 was a ferrite magnetic material was applied and copper was coated.

In addition, the core 322 has a shape in which a plurality of silicon steel sheets are stacked.

The feed rate of the thick plate (P) is 5mm / s, 400 kW power is applied, the separation distance of the heating means 300 and the thick plate (P), that is, the air gap (air gap) to maintain 5mm It was.

The air convection coefficient is 0.02 N / sec / mm / ° C.

As a result of the lactic acid element analysis under the conditions described above, as shown in FIG. 10, the heat input amount was distributed intensively in the center region of the thick plate P where the heating line is located, and at least the austenite A3 transformation temperature of the thick plate P (minimum) 950 ℃ or more) can be expected to increase the temperature.

And, as a result of predicting the temperature profile of the thick plate (P) at five different points as shown in Figure 11, due to the eddy current maximized by the edge effect at the initial corner of the thick plate (P) corresponding to step 1, Compared with over 100 ℃ overheating occurs.

In addition, according to the coil-core design as shown in FIGS. 8 and 9, when the coil surface surrounded by the first core block is positioned on the thick plate P, the first local maximum temperature is reached, and after the temperature is slightly dropped from the center, When the coil face surrounded by the first core block is located on the thick plate P, it can also be predicted that the overall maximum temperature is reached.

The scope of the present invention is not limited to the above-exemplified embodiments, and many other modifications based on the present invention may be made by those skilled in the art within the above technical scope.

As described in detail above, in the thick plate bending apparatus using high frequency induction heating according to the coil position automatic precision control according to the present invention, the shape and arrangement of the coil and the core are optimized, and the movement of the coil is automatically controlled and locally heated. Only the wire center was configured to enable rapid heating. At this time, since additional heating of the coil edges due to inadequate coil design does not occur, there is an advantage that the workability is improved by blocking material deformation of the thick plate in advance.

Therefore, the process time for the grain processing can be significantly shortened, there is an advantage that the productivity is improved.

In addition, since it does not use any gas, it can be applied as an eco-friendly method because there is no carbon dioxide emission compared to the existing gas torch type.

Claims (12)

delete Power supply means, A frame supporting multiple parts, Heating means for conducting high frequency induction heating on a rear plate seated on a work table; Transfer means for guiding movement of the heating means or work table; A heat exchanger for cooling via one side of the heating means, It comprises a control means for controlling the operation of the heating means, the transfer means and the heat exchanger, The transfer means, And the heating means is guided so as to be movable in three dimensions with respect to the thick plate. The method of claim 2, wherein the heating means, A transformer positioned under the heating means to inductionly heat the thick plate; A control box which receives power from the power supply means and controls the output size of the high frequency current; The apparatus for processing a thick plate using high frequency induction heating by coil position automatic precision control, characterized in that it comprises a connector for electrically connecting the control box and the transformer. The coil of claim 3, wherein the transformer receives a high frequency current from the control box and generates an alternating magnetic flux; And a core for accommodating the coil therein. The apparatus for processing a thick plate using high frequency induction heating by automatic coil position control. The apparatus for processing a thick plate of claim 4, wherein the coil is formed by bending a bar having a square cross section a plurality of times. The apparatus for processing a thick plate of claim 4 or 5, wherein the coil is bent to open in one direction. 7. The apparatus of claim 6, wherein the core is formed of a plurality of silicon steel sheets. The apparatus for processing a thick plate according to claim 3, wherein the heat exchanger cools the transformer and the connector at the same time. The apparatus of claim 3, wherein the transformer, the control box, and the connector are integrally coupled and simultaneously moved. The method of claim 8, wherein the connector is formed by bending a metal plate a plurality of times, one side is a high-frequency induction heating by automatic coil position automatic control, characterized in that the flow path is formed via the cooling water provided from the heat exchanger Thick plate processing equipment used. 4. The high frequency induction heating according to claim 3, wherein the outer space spaced apart from the transformer is provided with a gap holding hole for limiting the separation distance between the transformer and the thick plate by rolling and contacting the thick plate. Thick plate processing apparatus using a. 4. The thick plate of claim 3, wherein the conveying means comprises a shanghai conveying portion for allowing the heating means to linearly reciprocate in the height direction of the frame. Machining device.

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