KR20170073134A

KR20170073134A - Bending press device

Info

Publication number: KR20170073134A
Application number: KR1020150181679A
Authority: KR
Inventors: 윤태욱; 이문용
Original assignee: 주식회사 성우하이텍
Priority date: 2015-12-18
Filing date: 2015-12-18
Publication date: 2017-06-28
Also published as: KR101783245B1

Abstract

The bending press apparatus according to the embodiment of the present invention is a bending press apparatus which bends and shapes a shaping beam of a predetermined shape using upper and lower molds and is formed at both ends on the upper curvature molding surface of the upper mold to hold both ends of the molding beam by electromagnetic force A second electromagnet unit disposed on both sides of both ends of the lower mold to hold both sides of both ends of the shaping beam on the lower mold by an electromagnetic force, and a second electromagnet unit configured to control power supply to the first and second electromagnet units And a power supply unit.

Description

[0001] BENDING PRESS DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending press apparatus, and more particularly, to a bending press apparatus in which a bumper forming beam having a closed end face shape is curved by using an upper mold and a lower mold while bending both ends of the molding beam.

Generally, a bumper forming beam for a vehicle is manufactured by molding a closed end forming beam formed through a roll forming method into a predetermined curvature. In the roll forming method, a coil is loosened, and a roll former constituting a pair of an upper shaping roll and a lower shaping roll is passed through a roll former unit arranged in a row in multiple stages, and is bent and formed into various shapes.

FIG. 1 is a general roll forming system and its stepwise process conceptual view. In a general roll forming system and its process, an uncoiler 1 for uncoiling a coil 10 to be fed is disposed in front of a processing line to perform an uncoiling step S1 Go ahead.

The straightening step S2 is provided at the rear of the uncoiler 1 in the process direction to straighten the strip-shaped steel plate unwound from the uncoiler 1 to the flat steel plate panel 20 .

The steel plate panel 20 supplied from the straightener 2 is provided with a brake press 3 for forming holes for various purposes at the rear of the straightener 2 in the process direction so that the piercing step S3 is performed.

A roll forming unit 4 composed of at least ten roll formers R1 to R7 (not shown) is disposed behind the brake press 3 in the process direction, and the uncoiler 1, the straightener 2 ) And the steel plate panel 20 supplied through the brake press 3 are successively subjected to a roll forming step S4 in which a forming beam 30 having a closed end surface to be obtained is roll-formed .

A laser welder 5 is provided behind the roll forming unit 4 to irradiate a welding portion of the forming beam 30 with a laser beam output from the laser oscillator 5a to advance the welding step S5 .

A round bender 6 is provided behind the laser welding machine 5 to pass the forming beam 30 through a multistage bending roll unit disposed along a radius of curvature to be formed to form a forming beam having a predetermined curvature 40), as shown in Fig.

Fig. 2 is a side view of a general round bender. The round bender 6 includes a five-stage bending roll unit.

The first stage bending roll unit BR1 is constituted by a pair of bending rolls vertically in the process direction on the roll frame 6a and extends from the forming roll of the roll former (R7 in Fig. 1) And guides the forming beam 30 supplied through the welding step S5.

The second stage bending roll unit BR2 is also formed by a pair of bending rolls vertically behind the first bending roll unit BR1 on the roll frame 6a in the process direction, And is supported in the radial direction of the curvature.

The bending roll units BR3, BR4 and BR5 in the third stage, fourth stage and fifth stage are disposed behind the second bending roll unit BR2 on the roll frame 6a in the process direction, And each of the bending rolls is composed of a pair of upper and lower bending rolls and passes through the forming beam 30 to be shaped into a forming beam 40 having a certain curvature.

At the rear of the round bender 6 in the process direction, a cutting press 7 is provided to carry out a cutting step S7 for cutting the forming beam 40 according to the standard of finished products for commercialization.

FIG. 3 is a perspective view of an example of a bumper forming beam for a vehicle produced through a general roll forming system and process, in which the bumper forming beam 50 for a vehicle according to an exemplary embodiment produced through the above- The bumper forming beam 50 according to an example is bent so as to have a closed end face at the upper and lower ends, and both ends are laser welded to be formed into a certain curvature.

However, as shown in FIG. 3, the conventional bumper forming beam 50 is formed by curving along a wide inner width section in the radial direction of curvature during curvature molding through the round bender 6, A plurality of dents (D) that are uneven can be generated to lower the impact rigidity of the bumper forming beam 50.

In addition, the roll bending machine has a low dimensional accuracy in curvature forming, is difficult to apply to curvature forming of aluminum extrusion pipes or high-strength steel pipes, and the round bender and the stretch bending machine have high initial facility investment costs, .

The matters described in the background section are intended to enhance the understanding of the background of the invention and may include matters not previously known to those skilled in the art.

Korean Patent Application 10-2012-0143592

It is an object of the present invention to provide a bending apparatus which can reduce the dent generated in the molding process and thereby reduce the impact rigidity of the formed beam, have high dimensional accuracy, relatively low initial facility investment ratio for the bending apparatus, And to provide a bending press apparatus capable of improving productivity by abbreviation.

In order to achieve the above object, a bending press apparatus according to an embodiment of the present invention is a bending press apparatus in which a forming beam having a predetermined shape is bent and formed by using upper and lower molds and is formed at both ends on the upper curvature molding surface of the upper mold, A first electromagnet unit for holding both ends of the shaping beam on both sides of both ends of the lower mold by an electromagnetic force, and a second electromagnet unit for holding both sides of both ends of the shaping beam on the lower mold by electromagnetic force, And a power supply unit for controlling power supply to the electromagnet unit.

The first electromagnet unit may include a plurality of first electromagnets inserted and fixed in a plurality of grooves formed at both ends of the upper curvature forming surface of the upper mold.

The second electromagnet unit includes a fixed frame formed on both sides of both ends of the lower mold, a movable block slidably disposed on the sliding surface on the fixed frame, a movable block disposed on both sides of both ends of the formed beam, And a second electromagnet fixed on each of the end faces of the shaping beam and fixed on the fixed frame and connected to the moving block via a rod, Or backward.

The power supply unit may supply power to the first and second electromagnets to cause the first and second electromagnets to generate an electromagnetic force before the upper mold bends the forming beam.

The forming beam may be formed as a closed end beam by bending an ultra high strength steel plate having a tensile strength of 1180 MPa or more.

According to the present invention, there is an effect of bending a forming beam in a stretched state by bending the forming beam at a predetermined curvature by means of upper and lower molds while holding both ends of the forming beam through an electromagnet unit , It is possible to reduce the cycle time as compared with the conventional roll bending apparatus and round bending apparatus according to the press forming.

In addition, as compared with the roll bending apparatus and the round bending apparatus, productivity can be improved by bending a forming beam through press forming with a low facility investment cost.

Further, by arranging the bending press apparatus in conjunction with the rear end of the roll forming line, it is easy to replace, and the electromagnet unit can be used as a jig for holding another forming beam.

1 is a schematic view of a general roll forming system and its steps.
2 is a side view of a general round vender.
3 is a perspective view of an example of a bumper beam for a vehicle produced through a general roll forming system and process.
4 is a side cross-sectional view of a bending press apparatus according to an embodiment of the present invention.
5 is a front view of a bending press apparatus according to an embodiment of the present invention.
6 to 8 are operation states of the bending press apparatus according to an embodiment of the present invention.

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

It is to be understood, however, that the present invention is not limited to the illustrated embodiments, and that various changes and modifications may be made without departing from the spirit and scope of the invention. .

In order to clearly illustrate the embodiments of the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the entire specification.

In the following description, the names of the components are denoted by the first, second, etc. in order to distinguish them from each other because the names of the components are the same and are not necessarily limited to the order.

4 is a side cross-sectional view of a bending press apparatus according to an embodiment of the present invention.

4, the bending press apparatus includes a press driving unit 402, a slider 400, an upper mold 405, a first electromagnet 410, a base 425, a die plate 440, a lower mold 435, A beam 430, a fixed frame 420, and a second electromagnet 415.

The die plate 440 is fixedly disposed on the base 425 and the lower die 435 is fixedly disposed on the die plate 440. On the upper surface of the lower mold 435, a lower curvature molding surface F1 having a concave shape is formed.

The press drive unit 402 is disposed at a predetermined distance from the upper side of the lower mold 435 and the slider 400 is vertically movable by the press drive unit 402. The upper mold 405, Is fixedly disposed below the slider (400). The upper curvature molding surface F2 corresponding to the lower curvature molding surface F1 is formed on the lower surface of the upper mold 405. [

The forming beam 430 bendingly formed by the upper mold 405 and the lower mold 435 may have a pipe shape having a closed end face and the forming beam 430 may have a cross- It is made of high strength steel plate and can have a tensile strength of 1180 MPa or more.

The upper mold 405 and the lower mold 435 are combined to bend the forming beam 430 while holding both ends of the bending beam 430 at the time of bending by electromagnetic force generated by the electromagnet unit, And has a structure in which both ends of the forming beam 430 are fixed.

Therefore, by bending the forming beam 430 at a set curvature by the upper and lower curvature molds while holding both ends of the forming beam 430 through the electromagnet unit, the cycle time can be reduced.

Compared with the roll bending apparatus and the round bending apparatus, productivity can be improved by bending the forming beam 430 through press forming with a low equipment investment ratio.

In the embodiment of the present invention, the electromagnet unit includes a first electromagnet unit 411 installed in the upper mold and a second electromagnet unit 511 disposed on one side of the lower mold, and the first electromagnet unit 411 Includes a first electromagnet 410 inserted and fixed into a groove formed at both ends of the upper formed curvature surface F1 of the upper mold 405. [

At least two of the first electromagnets 410 may be disposed at predetermined intervals at both ends of the upper formed curvature surface F1. In FIG. 4, the first electromagnet 410 may be disposed on the upper mold 405, Are formed at both ends of the upper forming curvature surface F1 of the shaping beam 430 so as to fix the upper surfaces of both ends of the shaping beam 430. [

The first electromagnet 410 is disposed on the upper mold 405. The electromagnet may be inserted and fixed on the lower molded curvature surface F2 of the lower mold 435, The lower surface of the forming beam 430 may be fixed.

The second electromagnet unit 511 includes a second electromagnet 415 which is in close contact with both sides of the forming beam 430 disposed on the lower mold 435 and fixes both sides of the forming beam 430 And the second electromagnet unit 511 will be described in more detail with reference to FIG.

5 is a front view of a bending press apparatus according to an embodiment of the present invention. Explanations of the same and similar structures as compared with FIG. 4 are omitted, and differences will be mainly described.

5, the bending press apparatus includes a slider 400, a top mold 405, a first electromagnet 410, a forming beam 430, a bottom mold 435, a fixing frame 420, a moving block 505, A second electromagnet 415, and a drive cylinder 500.

The fixed frame 420 is fixedly disposed on both sides of the lower mold 435 at positions corresponding to both ends of the forming beam 430. The moving block 505 is slidably provided on the fixed frame 420, Plane.

The second electromagnet 415 is fixed to the front end surface of the moving block 505 and the driving cylinder 500 is fixed to the outside of the fixing frame 420, As shown in Fig.

Therefore, the operation of the bending press apparatus according to the embodiment of the present invention having the above-described structure will be described with reference to FIGS. 6 to 8. FIG.

6 to 8 are operation states of the bending press apparatus according to an embodiment of the present invention.

6, when the driving cylinder 500 advances the moving block 505 and the second electromagnet 415 fixed to the moving block 505 moves in the positive direction of the forming beam 430 Respectively.

That is, the driving cylinder 500 of the second electromagnet unit is configured such that before the upper mold 405 bends the forming beam 430, the second electromagnet 415 is formed on the side surface of the forming beam 430, And is brought into contact with both ends of the beam 430.

The power supply unit (not shown) supplies power to the first electromagnet 410 and the second electromagnet 415 so that the first electromagnet 410 and the second electromagnet 415 are powered by the electromagnetic force of the first electromagnet 410 and the second electromagnet 415, And holds the beam 430 at a predetermined force.

7, the slider 400 and the upper mold 405 are lowered by the press driving unit 402 to perform bending molding while pressing the upper surface of the central part of the forming beam 430 .

At this time, the first electromagnet 410 disposed at both ends of the upper formed curvature surface F1 of the upper mold 405 is brought into contact with the upper surfaces of both ends of the forming beam 430, (Not shown). That is, both ends of the forming beam 430 are held and fixed by the electromagnetic force of the first electromagnet 410 and the second electromagnet 415 during the bending process.

Accordingly, in the course of bending the forming beam 430, the first and second electromagnet units hold both ends of the forming beam 430 by electromagnetic force, so that the forming beam 430 is moved in both ends So that the effect of stretching can be realized.

8, when the bending is completed by the upper mold 405 and the lower mold 435, the power supply unit (not shown) is connected to the first electromagnet 410 and the second electromagnet 415, The electromagnetic force generated by the first electromagnet 410 and the second electromagnet 415 is removed.

The driving cylinder 500 retracts the movable block 505 through the rod so that the second electromagnet 415 is retracted from both sides of the forming beam 430, Is upwardly moved upward by the press driving unit 402 to allow the forming beam 430 to be bent out.

As described above, the bending press apparatus according to the embodiment of the present invention performs the bending press process while holding both ends of the forming beam by using the first electromagnet and the second electromagnet, The dimensional deformation of the formed beam can be reduced and a forming beam having a constant curvature can be secured.

Further, by forming the curvature in the forming beam through the pressing process, the cycle time due to rapid molding can be reduced, and the productivity can be improved, and the facility investment cost can be reduced as compared with the roll bending apparatus and the round bending apparatus.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

402: Press driving part 400: Slider
405: upper figure 410: first electromagnet
415: second electromagnet 420: fixed frame
425: base 430: forming beam
435: lower mold 440: die plate
F1: upper curvature forming surface F2: lower curvature forming surface
500: driving cylinder 505: moving block
411: first electromagnet unit 511: second electromagnet unit

Claims

A bending press apparatus for bending molding a forming beam having a predetermined shape using a top mold and a bottom mold,
A first electromagnet unit formed at both ends on the upper curvature molding surface of the upper mold to hold both ends of the forming beam with an electromagnetic force;
A second electromagnet unit configured to hold both sides of both ends of the shaping beam on the lower mold by electromagnetic force at both ends of the lower mold; And
A power supply unit for controlling power supply to the first and second electromagnet units;
Wherein the bending press apparatus comprises:

The method according to claim 1,
The first electromagnet unit includes:
And a plurality of first electromagnets inserted and fixed in a plurality of grooves formed at both ends of the upper curvature forming surface of the upper mold.

The method according to claim 1,
The second electromagnet unit includes:
A fixed frame formed on both sides of both ends of the lower mold;
A movable block slidably disposed on the sliding surface on the fixed frame, respectively;
A second electromagnet fixed to each end surface of the moving block so as to correspond to both sides of both ends of the forming beam; And
A drive cylinder fixed on the stationary frame and connected to the movable block through a rod, the drive cylinder advancing or retracting the movable block to bring the second electromagnet into contact with or separate from the surface of the forming beam;
Wherein the bending press apparatus comprises:

The method according to claim 2 or 3,
The power supply unit
And the first and second electromagnets generate an electromagnetic force by supplying power to the first and second electromagnets before the upper mold bends the forming beam.

The method according to claim 1,
The shaping beam
Wherein the ultra-high strength steel sheet having a tensile strength of 1180 MPa or more is bent to form a closed end beam.