KR102052172B1 - Press forming apparatus of sheet metal and its forming method - Google Patents

Abstract

The present invention relates to a press device of a metal plate and a press forming method, which can compensate a heat expansion amount of a metal plate caused by heating during hot press forming or warm press forming of the metal plate in order to prevent deformation. To this end, the present device comprises: a press mold provided with an upper mold and a lower mold in order to perform hot press forming on the metal plate which is heated; a first conduction clamp which supports one side in a longitudinal direction of the metal plate such that the metal plate may be located between the upper mold and the lower mold of the press mold; a second conduction clamp which supports the other side in the longitudinal direction of the metal plate after being installed to be opposed to the first conduction clamp; an electricity supply unit which is electrically connected to the first conduction clamp and the second conduction clamp, thereby generating a potential difference between the first conduction clamp and the second conduction clamp, such that a current may flow in the metal plate to electrically heat the same; a control unit which controls the current supplied to the electricity supply unit; and a compensation device which pressurizes the first conduction clamp or the second conduction clamp by coming in contact with an inclined surface, thereby moving the first conduction clamp or the second conduction clamp in the longitudinal direction of the metal plate, in order to compensate the heat expansion amount of the metal plate when the metal plate is electrically heated.

Description

Press forming apparatus of sheet metal and its forming method

The present invention relates to a press apparatus and a press molding method of a metal sheet, and more particularly, a press of a metal sheet which can prevent deformation by compensating for the thermal expansion of the metal sheet due to heating during hot or warm press molding of the metal sheet. It relates to an apparatus and a press molding method.

Recently, in the vehicle industry, ultra high strength steels and light alloy plates having high strength to weight, which are suitable for light weight and stability of vehicles, have been widely applied. However, since the super high strength steel has low formability and causes excessive spring back, it is difficult to manufacture a mold for forming the super high strength steel. A hot or warm press process may be used as a molding technique to solve this difficulty.

In general, a hot press process refers to a process of heating a metal sheet at 900 ° C. or more, supplying the heated metal sheet into a mold and molding, and then quenching the molded article in the mold to produce a molded article. As such, the hot press process is not only excellent in productivity because the molding and heat treatment are performed at the same time, but also to form a metal plate at a high temperature, thereby obtaining excellent moldability and dimensional accuracy. In addition, there is an advantage that the springback or spontaneous breakdown, which is particularly problematic in high-strength components, is significantly reduced. In comparison, the warm press process is a method of heating a metal sheet in a relatively low range of 200 to 400 ° C. and forming a heated metal sheet, which also improves formability and reduces springback.

Such a hot press process or a warm press process requires expensive equipment cost and a large production space. In order to solve this problem, a method of heating a metal sheet by a current-carrying heating method which can be heated even with a low production cost and low production space has been widely used.

However, the conventional press device for metal plate using energizing heating has a problem that deformation of the clamped metal sheet occurs due to thermal expansion of the metal sheet being heated during energizing heating of the metal sheet.

The present invention is to solve a number of problems, including the above problems, it is possible to form a metal plate at a low cost and to make efficient use of space, to compensate for the amount of thermal expansion during heating of the metal plate deformation of the metal plate An object of the present invention is to provide a press apparatus and a press molding method of a metal sheet that can prevent the damage. However, these problems are exemplary, and the scope of the present invention is not limited thereby.

According to one aspect of the present invention, there is provided a press apparatus of a metal sheet. The metal sheet press apparatus includes: a press die formed of an upper mold and a lower mold so as to press-form a heated metal sheet; A first energizing clamp capable of supporting one side in the longitudinal direction of the metal plate such that the metal plate is positioned between the upper mold and the lower mold of the press die; A second conduction clamp installed opposite the first conduction clamp and capable of supporting the other side of the metal plate in the longitudinal direction; An electricity supply unit electrically connected to the first conducting clamp and the second conducting clamp to generate a potential difference between the first conducting clamp and the second conducting clamp so that a current flows through the metal plate to be energized and heated; A control unit controlling a current supplied to the electric supply unit; And pressurizing the first conducting clamp or the second conducting clamp by inclined surface contact so that the first conducting clamp or the second conducting clamp is pressed by the inclined surface contact so as to compensate for the thermal expansion amount of the metal sheet during the energizing heating of the metal sheet. It may include; a compensation device for moving in the longitudinal direction of the metal plate.

In the press apparatus of the metal plate, the first conducting clamp, the first lower clamp for supporting one side of the longitudinal direction of the metal plate; And a first upper clamp installed to face the first lower clamp with the metal plate interposed therebetween, for pressing and fixing one upper surface of the metal plate in the longitudinal direction as the fastener is tightened.

In the pressing apparatus of the metal plate, the compensating device includes: a first guide rail slidably supporting the first lower clamp so that the first lower clamp can move in the longitudinal direction of the metal plate; And a first pressurized inclined surface having a shape corresponding to the first inclined surface on a lower surface of the first inclined surface formed by pressing the first inclined surface formed on the upper surface of the first upper clamp to move the first conduction clamp in the longitudinal direction of the metal plate. The first driving unit is formed; may include.

In the pressing apparatus of the metal plate, the compensation device, the first pressing inclined surface of the first drive portion presses the first inclined surface of the first upper clamp, the first conduction clamp according to the thermal expansion of the metal plate The first driving unit may be lowered in conjunction with the lowering motion of the upper mold of the press die so as to move.

In the pressing apparatus of the metal plate, the compensation device, the first pressing inclined surface of the first drive portion presses the first inclined surface of the first upper clamp, the first conduction clamp according to the thermal expansion of the metal plate A first actuator for lowering the first drive unit to move the; may further include.

In the metal sheet press apparatus, the second conducting clamp comprises: a second lower clamp for supporting the other lower surface of the metal plate in the longitudinal direction; And a second upper clamp installed to face the second lower clamp with the metal plate interposed therebetween, for pressing and fixing the other upper surface of the metal plate in the longitudinal direction as the fastener is tightened.

In the pressing apparatus of the metal plate, the compensating device includes: a second guide rail slidably supporting the second lower clamp so that the second lower clamp can move in the longitudinal direction of the metal plate; And a second pressing inclined surface having a shape corresponding to the second inclined surface on a lower surface of the second inclined surface so as to press the second inclined surface formed on the upper surface of the second upper clamp to move the second conducting clamp in the longitudinal direction of the metal plate. It may include a; second drive unit is formed.

In the metal sheet press apparatus, the compensation device may move the first conducting clamp and the second conducting clamp in a direction away from each other according to thermal expansion of the metal sheet.

In the press apparatus of the metal plate, the control unit may be connected to the electric supply unit and control the amount of current flowing between the first conduction clamp and the second conduction clamp by applying a current amount signal to the electricity supply unit.

According to one aspect of the present invention, there is provided a press molding method of a metal sheet. The press-molding method of the metal sheet may include a support step of supporting the metal sheet by the first conducting clamp and the second conducting clamp so that the metal sheet can be positioned between the upper and lower molds of the press die; An energization heating step in which an electric supply unit energizes and heats the metal sheet by generating a potential difference between the first energizing clamp and the second energizing clamp so that a current flows through the metal sheet; In order to compensate for the thermal expansion of the metal sheet during the energizing heating of the metal sheet, the compensating device is lowered to press the first conducting clamp and the second conducting clamp by the inclined surface contact so as to press the first conducting clamp and the first conducting clamp. A thermal expansion compensation step of moving the energizing clamps in a direction away from each other; And a hot forming step of hot forming the electrically heated metal plate using the press mold.

According to one embodiment of the present invention made as described above, it is possible to form a metal plate at a low cost, to enable efficient space utilization, and to prevent deformation of the metal plate by compensating for the amount of thermal expansion during heating of the metal plate. have.

Accordingly, the productivity of the hot or warm press molding of the metal sheet is improved, and the press apparatus and the press forming method of the metal sheet can be implemented, which has the effect of forming a high quality metal sheet by a simple process. Of course, the scope of the present invention is not limited by these effects.

1 is a cross-sectional view schematically showing a press apparatus of a metal sheet according to an embodiment of the present invention.
2 to 4 are cross-sectional views schematically showing a metal sheet press apparatus according to another embodiment of the present invention.
5 is a cross-sectional view schematically showing a metal plate press apparatus according to another embodiment of the present invention.
6 is a flowchart illustrating a press molding method of a metal sheet according to an embodiment of the present invention.

Hereinafter, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, and the following examples can be modified in various other forms, and the scope of the present invention is It is not limited to an Example. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In addition, the thickness or size of each layer in the drawings is exaggerated for convenience and clarity of description.

Embodiments of the present invention will now be described with reference to the drawings, which schematically illustrate ideal embodiments of the present invention. In the figures, for example, variations in the shape shown may be expected, depending on manufacturing techniques and / or tolerances. Accordingly, embodiments of the inventive concept should not be construed as limited to the specific shapes of the regions shown herein, but should include, for example, changes in shape resulting from manufacturing.

1 is a cross-sectional view schematically showing a press apparatus 100 of a metal sheet according to an embodiment of the present invention.

First, as shown in FIG. 1, the press apparatus 100 of a metal sheet according to an embodiment of the present invention is largely a press die 10, a first conduction clamp 20, and a second conduction clamp. 30, an electric supply unit 40, a controller (not shown), and a compensation device 50 may be included.

As shown in FIG. 1, the press die 10 may be formed of an upper mold 11 and a lower mold 12 so that the heated metal sheet P may be hot or warm pressed. For example, the upper mold 11 may include a punch portion 11b and a holding portion 11c provided on the upper mold base 11a. More specifically, the punch part 11b can shape | mold by pressing the shaping | molding area | region of the metal plate P. At this time, the holding part 11c uses the elastic force of the elastic member S provided between the holding part 11c and the upper base 11a to hold the holding area which is an area | region other than the said forming area | region of the metal plate P. Pressurized can be held without damaging the metal plate (P).

In addition, the lower mold | type 12 may include the die part 12b provided in the lower mold | type base 12a. The die portion 12b is recessed in a shape corresponding to the forming region of the metal sheet P corresponding to the punch portion 11b so that the metal sheet P can be formed by the punch portion 11b. Can be formed.

Here, the metal plate P includes a metal having conductivity so as to be electrically heated by current flowing through the first current clamp 20 and the second current clamp 30 to be described later, for example, a steel material. , Aluminum, magnesium, titanium, copper and alloys thereof. In addition to the above materials, various materials capable of hot press molding through energizing heating may be used.

In addition, as illustrated in FIG. 1, the first energizing clamp 20 may include a metal plate (P) such that the metal plate P may be located between the upper die 11 and the lower die 12 of the press die 10. One side of the longitudinal direction of P) is supported, and the 2nd electricity supply clamp 30 is provided so as to oppose the 1st electricity supply clamp 20, and can support the other side of the said longitudinal direction of the metal plate P.

At this time, the electricity supply unit 40 is electrically connected to the first conduction clamp 20 and the second conduction clamp 30 so that the current flows through the metal plate P so as to conduct electricity. ) And the second conduction clamp 30 can be generated. More specifically, the electrical supply unit 40 may be capable of supplying at least one of at least one of an alternating current, a direct current, a pulse wave, and a combination thereof.

The electric supply unit 40 is hot or hot press formed by increasing the temperature of the metal plate P according to the type of the metal plate P, which is the workpiece, to increase the elongation while decreasing the strength of the metal plate P. This can be made possible. For example, the metal plate P may be rapidly heated to a high temperature of 200 ° C. to 400 ° C. and 900 ° C. or more at the time of hot forming, depending on the current of the electric supply 40.

In this case, the controller (not shown) may control the current supplied to the electricity supply unit 40. For example, the control unit may be connected to the electricity supply unit 40 and control the amount of current flowing between the first conduction clamp 20 and the second conduction clamp 30 by applying a current amount signal to the electricity supply unit 40.

More specifically, the first energizing clamp 20 includes a first lower clamp 21 having a first lower clamp 21 and a metal sheet P interposed therebetween to support one lower surface of the metal plate P in the longitudinal direction. 21 may be disposed to face the first upper clamp 22 to press and fix the upper surface of one side of the metal plate P in the longitudinal direction as the fastener B is tightened.

Moreover, the 2nd electricity supply clamp 30 has the 2nd lower clamp 31 which sandwiches the 2nd lower clamp 31 and metal plate P which support the other bottom surface of the said longitudinal direction of the metal plate P between them. The second upper clamp 32 may be installed to face the upper surface of the metal plate P in the longitudinal direction by being fastened by the fastener B.

Therefore, in the state where the metal plate P is fixed between the upper mold | type 11 and the lower mold | type 12 of the press metal mold | die 10 by the 1st electricity supply clamp 20 and the 2nd electricity supply clamp 30, 1st electricity supply is carried out. The metal sheet P is energized and heated to a high temperature by a current supplied through the clamp 20 and the second energizing clamp 30, thereby reducing the strength of the metal sheet P and improving the elongation. It can be easily hot or warm press-molded by the mold 10.

At this time, during the energization heating of the metal sheet P, the compensator 50 is the first conduction clamp by the inclined surface contact so as to compensate for the amount of thermal expansion that extends in the longitudinal direction while the metal sheet P is heated to a high temperature. By pressing the 20 or the second energizing clamp 30, the first energizing clamp 20 or the second energizing clamp 30 can be moved by the thermal expansion amount in the longitudinal direction of the metal plate P.

More specifically, the compensating device 50 includes a first guide rail that slidably supports the first lower clamp 21 so that the first lower clamp 21 can move in the longitudinal direction of the metal plate P. The first inclined surface 22a formed on the upper surface of the 51 and the first upper clamp 22 is pressed to move the first conduction clamp 20 in the longitudinal direction of the metal plate P. The first driving part 52 may include a first pressing inclined surface 52a having a shape corresponding to the first inclined surface 22a.

At this time, in the compensating device 50, the first pressing inclined surface 52a of the first driving unit 52 presses the first inclined surface 22a of the first upper clamp 22 to prevent thermal expansion of the metal plate P. Accordingly, the first driving unit 52 may be lowered in conjunction with the downward movement of the upper die 11 of the press die 10 so that the first conduction clamp 20 may be moved. For example, the first drive unit 52 is formed to be connected to the upper die 11 of the press die 10 in one body, or various power transmission such as gear and rack combinations, sprocket wheel combinations, belt and pulley combinations, pulleys and wire combinations. It may be formed to be interlocked by the member.

Therefore, the press apparatus 100 of the metal sheet according to an embodiment of the present invention, during the energization heating of the metal sheet P, to compensate for the amount of thermal expansion that extends in the longitudinal direction while the metal sheet P is heated to a high temperature. So that the compensating device 50 moves the first conduction clamp 20 in the longitudinal direction of the metal sheet P by the amount of thermal expansion, so that the metal sheet P can be generated by thermal expansion during energizing heating. The deformation can be prevented.

In addition, since the compensating device 50 can be operated in conjunction with the lowering motion of the upper die 11 of the press die 10 without a separate driving unit, it is possible to simplify the structure of the press device 100 of the metal sheet Therefore, efficient space utilization can be made possible.

Therefore, through energizing heating, the metal sheet P can be hot or warm press-molded at a low cost, enabling efficient space utilization, and compensating for the thermal expansion of the metal sheet P. Deformation of the metal plate P can be prevented even in the volume expansion of the plate P. FIG. Accordingly, productivity may be improved during hot or warm press molding of the metal plate P, and may have an effect of hot or hot press forming the high quality metal plate P in a simple process.

2 to 4 are cross-sectional views schematically showing a metal plate press apparatus 200 according to another embodiment of the present invention.

As shown in FIGS. 2 to 4, the compensator 50 has a first conducting clamp 20 and a second conducting clamp according to thermal expansion of the metal sheet P when conducting heating of the metal sheet P. FIG. The thermal expansion amount of the metal sheet P can be compensated by moving the 30 in a direction away from each other.

More specifically, the compensating device 50 includes a first guide rail that slidably supports the first lower clamp 21 so that the first lower clamp 21 can move in the longitudinal direction of the metal plate P. The first inclined surface 22a formed on the upper surface of the 51 and the first upper clamp 22 is pressed to move the first conduction clamp 20 in the longitudinal direction of the metal plate P. The first driving part 52 may include a first pressing inclined surface 52a having a shape corresponding to the first inclined surface 22a.

In addition, the compensator 50 includes a second guide rail 54 that slidably supports the second lower clamp 31 so that the second lower clamp 31 can move in the longitudinal direction of the metal plate P. ) And the second inclined surface on the lower surface so as to press the second inclined surface 32a formed on the upper surface of the second upper clamp 32 to move the second conducting clamp 30 in the longitudinal direction of the metal plate P. The second driving unit 55 may include a second pressing inclined surface 55a having a shape corresponding to that of 32a.

As a result, the compensation device 50 presses the first inclined surface 52a of the first driving unit 52 to press the first inclined surface 22a of the first upper clamp 22, and thus, the second driving unit 55 of the second driving unit 55. The second pressurized inclined surface 55a presses the second inclined surface 32a of the second upper clamp 32 so that when the energized heating of the metal sheet P is performed, the first conducting clamp (c) is subjected to thermal expansion of the metal sheet P. 20) and the second conduction clamp 30 may be moved in a direction away from each other to compensate for the thermal expansion amount of the metal plate P. At this time, the first driving unit 52 and the second driving unit 55 are lowered in conjunction with the lowering motion of the upper mold 11 of the press die 10, so that the first driving unit 52 and the second driving unit without a separate driving device. 55 can be driven.

Therefore, the press apparatus 200 of the metal sheet according to another embodiment of the present invention, during the energization heating of the metal sheet P, to compensate for the amount of thermal expansion that extends in the longitudinal direction while the metal sheet P is heated to a high temperature. By the compensation device 50 to move the first conduction clamp 20 and the second conduction clamp 30 away from each other in the longitudinal direction of the metal plate P by the amount of thermal expansion, so that the thermal expansion during the conduction heating It is possible to prevent the deformation of the metal plate (P) that can be caused by.

At this time, since the first conduction clamp 20 and the second conduction clamp 30 move away from each other by the amount of thermal expansion, the thermal expansion amount of the metal sheet P is compensated on both sides of the metal sheet P, so that the metal Since the alignment of the plate material P and the punch part 11b is not disturbed, hot or warm press molding of the metal plate material P can be made more sophisticated without an error.

In addition, since the compensating device 50 can be operated in conjunction with the lowering motion of the upper die 11 of the press die 10 without a separate driving unit, the structure of the press device 200 of the metal plate can be further simplified. Therefore, efficient space utilization can be made possible.

Therefore, through energizing heating, the metal sheet P can be hot or warm press-molded at a low cost, enabling efficient space utilization, and the metal sheet P (without misalignment of the alignment position of the metal sheet P and the punch portion 11b). Since the thermal expansion amount of P) can be compensated, deformation of the metal sheet P can be prevented even in the volume expansion of the metal sheet P due to high temperature heating. Accordingly, productivity may be improved during hot or warm press molding of the metal plate P, and may have an effect of hot or hot press forming the high quality metal plate P in a simple process.

5 is a cross-sectional view schematically showing a metal sheet press apparatus 300 according to another embodiment of the present invention.

As shown in FIG. 5, in the compensating device 50, the first pressing inclined surface 52a of the first driving unit 52 presses the first inclined surface 22a of the first upper clamp 22 to form a metal plate. The second pressure inclined surface 55a of the first actuator 53 and the second drive unit 55 which lower the first drive unit 52 so that the first conduction clamp 20 can be moved in accordance with thermal expansion of (P). The second driving part 55 is lowered to press the second inclined surface 32a of the second upper clamp 32 to move the second conducting clamp 30 in accordance with the thermal expansion of the metal plate P. It may include a second actuator 56.

At this time, the control unit (not shown) applies a movement control signal to the first actuator 53 and the second actuator 56 in accordance with the thermal expansion amount of the metal plate P during energizing heating of the metal plate P. Can be. Here, the controller may be made of various systems such as a microprocessor, a circuit, a computer, and a control box.

In addition, the control unit is provided with an input device, and receives the thermal expansion information of the metal plate (P) through the input device to apply the movement control signal to the first actuator 53 and the second actuator 56. have. The thermal expansion information may be at least one of a shape, a thickness, a material, a heating time, and a thermal expansion coefficient of the metal plate P. Accordingly, the controller may apply the movement control signal to the first actuator 53 and the second actuator 56 according to the thermal expansion amount of the metal plate P previously calculated.

Accordingly, the metal sheet press apparatus 300 according to another embodiment of the present invention compensates for the amount of thermal expansion that extends in the longitudinal direction while the metal sheet P is heated to a high temperature when the sheet metal P is energized and heated. The compensator 50 drives the first actuator 53 and the second actuator 56 in accordance with the thermal expansion amount of the metal sheet P calculated in advance, so that the first conduction clamp ( 20) and the second conduction clamp 30 are moved away from each other in the longitudinal direction of the metal sheet P, it is possible to prevent deformation of the metal sheet P, which may be caused by thermal expansion during energizing heating.

At this time, since the first conduction clamp 20 and the second conduction clamp 30 move away from each other by the amount of thermal expansion, the thermal expansion amount of the metal sheet P is compensated on both sides of the metal sheet P, so that the metal Since the alignment of the plate material P and the punch part 11b is not disturbed, hot or warm press molding of the metal plate material P can be made more sophisticated without an error.

Therefore, through energizing heating, the metal sheet P can be hot or warm press-molded at a low cost, enabling efficient space utilization, and the metal sheet P (without misalignment of the alignment position of the metal sheet P and the punch portion 11b). Since the thermal expansion amount of P) can be compensated, deformation of the metal sheet P can be prevented even in the volume expansion of the metal sheet P due to high temperature heating. Accordingly, productivity may be improved during hot or warm press molding of the metal plate P, and may have an effect of hot or hot press forming the high quality metal plate P in a simple process.

6 is a flowchart illustrating a press molding method of a metal sheet according to an embodiment of the present invention.

As shown in FIG. 6, in the press molding method of the metal sheet according to the embodiment of the present invention, the metal sheet P may be located between the upper mold 11 and the lower mold 12 of the press mold 10. The first supply clamp 20 and the second conduction clamp 30 support the step (S10) for supporting the metal plate (P), and the electrical supply unit 40 so that the current flows through the metal plate (P) An energization heating step (S20) for energizing and heating the metal plate (P) by generating a potential difference between the first current clamping clamp (20) and the second current clamping clamp (30), and the metal plate during the energization heating of the metal plate (P) ( In order to compensate for the thermal expansion amount of P), the compensating device 50 descends and presses the first conducting clamp 20 and the second conducting clamp 30 by the inclined surface contact, and thus the first conducting clamp 20 and the first conducting clamp 20 are made. 2 Press the thermal expansion compensation step (S30) and the energized heated metal plate (P) to move the energization clamp 30 in a direction away from each other It may include a hot forming step (S40) for hot or warm molding using the mold (10).

Therefore, the press-molding method of the metal sheet according to an embodiment of the present invention, when the energized heating of the metal sheet (P), so that the metal sheet (P) is heated to a high temperature to compensate for the amount of thermal expansion that extends in the longitudinal direction The compensation device 50 moves the first conduction clamp 20 and the second conduction clamp 30 away from each other in the longitudinal direction of the metal sheet P by the amount of thermal expansion, thereby causing the thermal expansion during energization heating. It is possible to prevent the deformation of the metal plate (P) that can be.

At this time, since the first conduction clamp 20 and the second conduction clamp 30 move away from each other by the amount of thermal expansion, the thermal expansion amount of the metal sheet P is compensated on both sides of the metal sheet P, so that the metal Since the alignment of the plate material P and the punch part 11b is not disturbed, hot or warm press molding of the metal plate material P can be made more sophisticated without an error.

In addition, since the compensating device 50 can be operated in conjunction with the lowering motion of the upper die 11 of the press die 10 without a separate driving unit, it is possible to simplify the structure of the press device 100 of the metal sheet Therefore, efficient space utilization can be made possible.

Therefore, through energizing heating, the metal sheet P can be hot or warm press-molded at a low cost, enabling efficient space utilization, and the metal sheet P (without misalignment of the alignment position of the metal sheet P and the punch portion 11b). Since the thermal expansion amount of P) can be compensated, deformation of the metal sheet P can be prevented even in the volume expansion of the metal sheet P due to high temperature heating. Accordingly, productivity may be improved during hot or warm press molding of the metal plate P, and may have an effect of hot or hot press forming the high quality metal plate P in a simple process.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

10: press mold
20: first energizing clamp
30: second energized clamp
40: electricity supply
50: compensation device
P: metal plate
100, 200, 300: press apparatus for metal sheet

Claims (10)

A press die consisting of an upper mold and a lower mold so as to press-form the heated metal sheet;
A first energizing clamp capable of supporting one side in the longitudinal direction of the metal plate such that the metal plate is positioned between the upper mold and the lower mold of the press die;
A second conduction clamp installed to face the first conduction clamp and capable of supporting the other side of the metal plate in the longitudinal direction;
An electricity supply unit electrically connected to the first conducting clamp and the second conducting clamp to generate a potential difference between the first conducting clamp and the second conducting clamp so that a current flows through the metal plate to be energized and heated;
A control unit controlling a current supplied to the electric supply unit; And
In order to compensate for the thermal expansion of the metal sheet during energizing heating of the metal sheet, the first conducting clamp or the second conducting clamp is pressed by pressing the first conducting clamp or the second conducting clamp by the inclined surface contact. A compensation device for moving in the longitudinal direction of the metal sheet;
The first conduction clamp,
A first lower clamp supporting one lower surface of the metal plate in the longitudinal direction; And
And a first upper clamp installed to face the first lower clamp with the metal plate interposed therebetween, for pressing and fixing one upper surface of the metal plate in the longitudinal direction as the fastener is tightened.
The compensation device,
A first guide rail slidably supporting the first lower clamp so that the first lower clamp can move in the longitudinal direction of the metal plate; And
In order to press the first inclined surface formed on the upper surface of the first upper clamp to move the first conducting clamp in the longitudinal direction of the metal plate, the lower surface of the first pressing inclined surface having a shape corresponding to the first inclined surface is provided. It includes; a first drive unit is formed,
The first driving unit is configured to press the first inclined surface of the first driving unit to press the first inclined surface of the first upper clamp to move the first conduction clamp in accordance with thermal expansion of the metal plate. The metal plate press apparatus which descends in connection with the downward motion of the said upper mold | type of a metal mold | die. delete delete delete delete The method of claim 1,
The second energization clamp,
A second lower clamp supporting the other lower surface of the metal plate in the longitudinal direction; And
A second upper clamp installed to face the second lower clamp with the metal plate interposed therebetween, for pressing and fixing the other upper surface of the metal plate in the longitudinal direction as the fastener is tightened;
A metal sheet press apparatus comprising a. The method of claim 6,
The compensation device,
A second guide rail slidably supporting the second lower clamp so that the second lower clamp can move in the longitudinal direction of the metal plate; And
In order to press the second inclined surface formed on the upper surface of the second upper clamp to move the second conduction clamp in the longitudinal direction of the metal plate, a lower pressure inclined surface having a shape corresponding to the second inclined surface is formed on the lower surface. A second driver formed;
A metal sheet press apparatus comprising a. The method of claim 7, wherein
The compensation device,
The metal plate press apparatus which moves the said 1st electricity supply clamp and the said 2nd electricity supply clamp in the direction away from each other by the thermal expansion of the said metal plate material. The method of claim 1,
The control unit,
And a current supply signal connected to the electricity supply unit to control an amount of current flowing between the first conduction clamp and the second conduction clamp by applying a current amount signal to the electricity supply unit. delete

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