ROLL BENDING MACHINE AND ROLL BENDING METHOD

TECHNICAL FIELD

The present disclosure relates to a roll bending apparatus and a roll bending method.

BACKGROUND ART

It should be noted that the content described in this zone simply provides background information on the present disclosure and does not constitute prior art.

The roll forming process is a process of manufacturing a beam with a certain cross-section by inserting a coil or a long plate into continuously arranged forming rolls using a roll forming device and sequentially bending and forming the same. Once the beam has passed through and been formed through the last roll of the roll forming process, various post-processes may be applied to suit the final product.

The roll bending process is a process of bending the roll formed straight beam by disposing a roll bending apparatus on the rear end of the roll forming device in the roll forming process. While a bending roll of the roll bending apparatus rotates, the roll forming device may enter the beam thereinto at a constant speed, and while the bending roll rotates, a transition zone in which the bending curvature of the beam changes may occur.

The curvature of the transition zone has an arbitrary value, which may reduce dimensional accuracy of the part and cause problems such that the design curvature of the part cannot be satisfied.

- (Patent Document 1) KR 20-1994-0004984 Y1

SUMMARY OF INVENTION
Technical Problem

An aspect of the present disclosure is to provide a roll bending apparatus and a roll bending method in which productivity and dimensional accuracy may be improved.

Solution to Problem

According to an aspect of the present disclosure, a roll bending apparatus includes a roll set frame movably installed; and a bending frame having a plurality of bending rolls bending a material, and rotating on the roll set frame to adjust positions of the plurality of bending rolls.

The roll set frame may include a support frame; and a moving frame provided with the bending frame installed thereon and moving along a material supply direction on the support frame.

The moving frame may move at a speed corresponding to a supply speed of the material on the support frame when bending the material in a transition zone.

The bending frame may include a rotating plate body of a circular shape rotatably installed on the moving frame; and a plurality of bending rolls rotatably driven on the rotating plate body and having positions adjusted as the rotating plate body rotates.

The positions of the plurality of bending rolls may be adjusted as the rotating plate body rotates in a transition zone, and at least some of the plurality of bending rolls may press the material such that the material follows a shape of a final product.

The bending frame may include a first bending roll, a second bending roll, and a third bending roll disposed radially at intervals of 120 degrees based on a rotation center of the rotating plate body. When the material is formed to have a curvature in a downwardly curved shape, the first bending roll and the second bending roll may come into contact with the material to form a radius of curvature of the material. When forming a curvature of the material in an upwardly curved shape, the first bending roll and the third bending roll may come into contact with the material to form a radius of curvature of the material.

The roll bending apparatus may further include a first driving unit installed on the moving frame, connected to one side of the rotating plate body, and rotating the rotating plate body; and a second driving unit installed on the moving frame, connected to the other side of the rotating plate body, and rotating the rotating plate body together with the first driving unit.

The first driving unit and the second driving unit may include a screw bolt rotated by a motor member; a support block fixed to the moving frame and rotatably supporting the screw bolt; a moving block moving according to rotation of the screw bolt; and a link member having one side connected to the moving block and the other side connected to the rotating plate body of the bending frame.

The first driving unit and the second driving unit may further include a guide rod fixed to the support block and the moving frame and guiding movement of the moving block.

According to an aspect of the present disclosure, a roll bending method includes a material entry operation of moving a material and entering a tip of the material into between adjacent bending rolls of a bending frame; a first bending operation of moving a moving frame of a roll set frame in a material supply direction, supplying the material while rotating the bending frame in a first direction, and bending a first transition zone of the material; and a second bending operation of supplying the material while stopping movement of the moving frame and stopping rotation of the bending frame, and bending a target curvature zone of the material after the first transition zone.

The first transition zone may be a zone in which the material is bent while a curvature of the material changes from a first radius of curvature, which is an initial radius of curvature of the material, to a second radius of curvature, which is a target radius of curvature of the material. The target curvature zone may be a zone in which a certain portion of the material is bent to the second radius of curvature after the first transition zone.

The roll bending method may further include a third bending operation of moving the moving frame in a supply direction of the material, supplying the material while rotating the bending frame in a second direction opposite to the first direction, and bending a second transition zone of the material after the target curvature zone.

The second transition zone may be a zone in which the material is bent while a curvature of the material changes from the second radius of curvature, which is the target radius of curvature of the material, to the first radius of curvature, which is the initial radius of curvature of the material.

In the first bending operation, the moving frame may be moved at a speed corresponding to the supply speed of the material when bending the material in the first transition zone. In the third bending operation, the moving frame may be moved at a speed corresponding to the supply speed of the material when bending the material in the second transition zone.

Advantageous Effects of Invention

As set forth above, according to an embodiment of the present disclosure, there is an effect of improving productivity and dimensional accuracy of a roll bending apparatus and a roll bending method.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1A is a diagram illustrating a material bent by a roll bending apparatus and a roll bending method of a comparative example, as compared with a roll bending apparatus and a roll bending method of the present disclosure.

FIG. 1B is a diagram illustrating a material bent by a roll bending apparatus and a roll bending method according to an embodiment of the present disclosure in contrast to the comparative example of FIG. 1A.

FIG. 2 is a diagram illustrating a roll bending apparatus according to an embodiment of the present disclosure.

FIG. 3 is a view illustrating an enlarged detail of the roll bending apparatus of FIG. 2.

FIGS. 4A and 4B are diagrams illustrating a rotational operation of a bending frame of the roll bending apparatus of FIG. 2.

FIG. 5 is a view of FIG. 3 taken in the ‘I’ direction.

FIG. 6(A) is a diagram illustrating a state in which a material is formed in a downwardly curved curvature by a roll bending apparatus and a roll bending method according to an embodiment of the present disclosure.

FIG. 6(B) is a diagram illustrating a state in which a material is formed in an upwardly curved curvature by a roll bending apparatus and a roll bending method according to an embodiment of the present disclosure.

FIGS. 7 and 8 are diagrams illustrating a roll bending method according to an embodiment of the present disclosure.

FIGS. 9 and 10 are views illustrating enlarged details of a material bent in the roll bending method of FIGS. 7 and 8.

BEST MODE FOR INVENTION

Hereinafter, preferred embodiments of the present disclosure will be described with reference to the attached drawings. However, embodiments of the present disclosure may be modified in various other forms, and the scope of the present disclosure is not limited to the embodiments described below. Additionally, the embodiments of the present disclosure are provided to more completely explain the present disclosure to those with average knowledge in the relevant technical field. The shapes and sizes of elements in drawings may be exaggerated for clearer illustration.

In the detailed description of the roll bending apparatus and the roll bending method of the present disclosure, and the like, the description was made using the terminology of left and right direction, vertical direction, and front-to-back direction, but this is for convenience of explanation. It should be noted that the technical features of the roll bending apparatus and the roll bending method of the present disclosure are not limited to this direction.

Hereinafter, before describing the components of a roll bending apparatus and a roll bending method according to an embodiment of the present disclosure, the roll bending apparatus and the roll bending method according to an embodiment of the present disclosure (hereinafter referred to as the ‘Embodiment’) and, a roll bending apparatus and a roll bending method of a comparative example (hereinafter referred to as ‘comparative example’) in contrast to the present disclosure will be compared and explained.

FIG. 1A is a diagram illustrating a material bent by a roll bending apparatus and a roll bending method of comparative example in contrast to the roll bending apparatus and the roll bending method of the present disclosure, and FIG. 1B is a diagram illustrating a material bent by a roll bending apparatus and a roll bending method according to an embodiment of the present disclosure in contrast to the comparative example of FIG. 1A.

For example, in the embodiments and comparative examples, the material may be bent to form a transfer zone S1, a first transition zone SN-1, a target curvature zone, a second transition zone SN-2, and a transfer zone S1.

In this case, the transfer zone S1 is a zone in which the material is not bent. In the transfer zone S1, the material has a first radius of curvature R1, and in the case in which the supplied material is straight, the first radius of curvature R1 in the transfer zone S1 may have an infinite value.

The target curvature zone S2 is a zone in which a certain portion of the material is bent to a second radius of curvature R2 after the first transition zone SN-1. In the target curvature zone S2, the material may have the second radius of curvature R2.

The first transition zone SN-1 is a bending zone when the curvature of the material changes to a random curvature, from the first radius of curvature R1, which is the initial radius of curvature of the material before bending, to the second radius of curvature R2, which is the target radius of curvature of the material.

The second transition zone SN-2 is a zone in which the material is bent while the curvature of the material changes to a random curvature, from the second radius of curvature R2, which is the target radius of curvature of the material, to the first radius of curvature R1, which is the initial radius of curvature of the material before bending.

In the first and second transition zones, the material may have an Nth radius of curvature RN, and the Nth radius of curvature RN may gradually change in curvature between the first radius of curvature R1 of the transfer zone S1 and the second radius of curvature R2 of the target curvature zone S2.

Referring to FIG. 1A, in the case of the comparative example, unlike the embodiment of the present disclosure, a roll set frame 100 does not move in the material supply direction, and accordingly, it can be seen that dimensional errors occur in the final product produced as the material is pushed as much as the material supply speed in the first transition zone SN-1 and the second transition zone SN-2.

In addition, in the case of the comparative example, a bending frame 200 rotates and the position of a bending roll 230 is not adjusted, and accordingly, it can be seen that the curvature radius of the material cannot be precisely controlled in the first transition zone SN-1 and the second transition zone SN-2, and a large dimensional error occurs in the final product produced, compared to the embodiment.

Referring to FIG. 1B, in the embodiment, as a roll set frame 100 moves in the supply direction of the material, it can be seen that even if the material is supplied in the first transition zone SN-1 and the second transition zone SN-2, the material is not pushed and no dimensional error occurs.

Referring to FIG. 1B, in the embodiment, a bending frame 200 rotates to adjust the position of a bending roll 230, and thus it can be seen that dimensional errors do not occur because the curvature radius of the material may be precisely adjusted in the first transition zone SN-1 and the second transition zone SN-2.

Hereinafter, with reference to FIGS. 2 to 4B, the components included in the roll bending apparatus according to an embodiment of the present disclosure will be described in detail.

FIG. 2 is a diagram illustrating a roll bending apparatus according to an embodiment of the present disclosure, FIG. 3 is a view illustrating an enlarged detail of the roll bending apparatus of FIG. 2, and FIGS. 4A and 4B are diagrams illustrating the rotational operation of a bending frame 200 of the roll bending apparatus of FIG. 2.

The roll bending apparatus according to an embodiment of the present disclosure may include a roll set frame 100 and the bending frame 200.

The roll set frame 100 may be installed to be movable. For example, the roll set frame 100 may be installed to be movable in the material supply direction.

A moving frame 110 of the roll set frame 100 may move at a speed corresponding to the supply speed of the material. For example, the roll set frame 100 may move from left to right, which is the direction corresponding to the supply direction of the material.

A material J may be moved to a roll bending apparatus such as a transfer roll K or the like so that the tip of the material J enters between adjacent bending rolls 230 of the bending frame 200. For example, the material J produced by the roll forming method may be supplied at a constant speed by the transfer roll K or the like.

The bending frame 200 has a plurality of bending rolls 230 that bend the material, and the positions of the plurality of bending rolls 230 may be adjusted, while rotating on the roll set frame 100.

In the roll bending apparatus, as the roll set frame 100 moves in the material supply direction, it can be seen that even if the material is supplied in the first transition zone SN-1 and the second transition zone SN-2, the material is not pushed and no dimensional error occurs.

In the roll bending apparatus, the positions of the plurality of bending rolls 230 are adjusted so that at least some of the plurality of bending rolls 230 may press the material so that it follows the shape of the final product as the bending frame 200 rotates, and thus it can be seen that dimensional errors do not occur because the curvature radius of the material may be precisely adjusted in the first transition zone SN-1 and the second transition zone SN-2.

The roll set frame 100 may include the moving frame 110 and a support frame 130.

The support frame 130 may have a guide rail 131 that guides the moving frame 110 to move in the material supply direction. The guide rail 131 may be installed on the front of the support frame 130, and the guide rail 131 may extend in the left and right directions and may be installed as a pair to be spaced apart in the vertical direction.

The moving frame 110 is equipped with the bending frame 200 and may move in the material supply direction on the support frame 130.

For example, the moving frame 110 may be equipped with the bending frame 200, a first driving unit 300, and a second driving unit 400. The guide rail 131 is disposed on the rear of the moving frame 110, and the moving frame 110 may be installed to be movable in the left and right directions on the guide rail 131. In the case in which the material is supplied from left to right, the moving frame 110 may also move from left to right.

When bending the material in the transition zone, the moving frame 110 may move at a speed corresponding to the supply speed of the material on the guide rail 131. Accordingly, as the moving frame 110 moves, a separate degree of freedom is provided in the direction of supply of the material, and the movements of the material and the moving frame 110 are synchronized to minimize occurrence of dimensional errors in the material in the transition zone.

For example, when bending the material in the transition zone, the moving frame 110 may move at the same speed as the material supply speed on the guide rail 131.

The bending frame 200 may include a rotating plate body 210 and a plurality of bending rolls 230.

The rotating plate body 210 may be rotatably installed on the moving frame 110. The rotating plate body 210 may have a circular shape and may be rotatably installed on the moving frame 110 via a rotating axis.

As the rotating plate body 210 rotates on the moving frame 110, the positions of the plurality of bending rolls 230 are adjusted, at least some of the plurality of bending rolls 230 may pressurize the material so that it follows the shape of the final product.

The plurality of bending rolls 230 are driven to rotate on the rotating plate body 210, and positions thereof may be adjusted as the rotating plate body 210 rotates. The bending roll 230 may bend the material while contacting the material, and the bending roll 230 may be rotationally driven by a bending motor (not illustrated).

The plurality of bending rolls 230 may be disposed radially with respect to the rotation center of the rotating plate body 210. For example, a first bending roll 231, a second bending roll 232, and a third bending roll 233 may be installed on the rotating plate body 210.

As the rotating plate body 210 rotates in the transition zone, the positions of the plurality of bending rolls 230 are adjusted, and at least some of the plurality of bending rolls 230 pressurize the material so that the material follows the shape of the final product.

The transition zone is a zone in which the material is bent while the curvature of the material changes to a random curvature, between the first radius of curvature R1, which is the initial radius of curvature of the material, and the second radius of curvature R2, which is the target radius of curvature of the material. For example, when a non-bending straight material is supplied to a roll bending apparatus, the first radius of curvature R1 may have an infinite value.

The transition zone may include a first transition zone SN-1 and a second transition zone SN-2. The first transition zone SN-1 is a zone in which the material is bent while the curvature of the material changes to a random curvature, from the first radius of curvature R1, which is the initial radius of curvature of the material before bending, to the second radius of curvature R2, which is the target radius of curvature of the material. The second transition zone SN-2 is a zone in which the material is bent while the curvature of the material changes to a random curvature, from the second radius of curvature R2, which is the target radius of curvature of the material, to the first radius of curvature R1, which is the initial radius of curvature of the material before bending.

In the roll bending apparatus, as the bending frame 200 rotates in the first and second transition zones, the positions of the plurality of bending rolls 230 may be adjusted so that at least some of the plurality of bending rolls 230 may press the material such that the material follows the shape of the final product.

For example, in the first transition zone SN-1, the first bending roll 231 and the second bending roll 232 rotate and come into contact with the material so that the material follows the shape of the final product, thereby improving the dimensional accuracy of the final product. In the second transition zone SN-2, the first bending roll 231 and the third bending roll 233 rotate and come into contact with the material so that the material follows the shape of the final product, thereby improving the dimensional accuracy of the final product.

The roll bending apparatus may include a first driving unit 300 and a second driving unit 400.

The first driving unit 300 is installed on the moving frame 110 and is connected to one side of the rotating plate body 210 to rotate the rotating plate body 210. The second driving unit 400 is installed on the moving frame 110 and is connected to the other side of the rotating plate body 210 to rotate the rotating plate body 210 together with the first driving unit 300.

The first driving unit 300 and the second driving unit 400 may be disposed to be spaced apart from each other with the bending frame 200 therebetween. For example, the first driving unit 300 and the second driving unit 400 may be disposed to be spaced apart in the left and right directions.

The first driving unit 300 and the second driving unit 400 may include screw bolts, support blocks, moving blocks, and link members. The first driving unit 300 includes a first screw bolt 310, a first support block 330, a first moving block 350, and a first link member 370 rotated by a first motor member 311, and the second driving unit 400 may include a second screw bolt 410, a second support block 430, a second moving block 450, and a second link member 470.

The screw bolt may be rotated by the motor member. For example, the screw bolt extends in the vertical direction, and a motor member is disposed on one side of the screw bolt to rotate the screw bolt. The first screw bolt 310 may rotate by the first motor member 311, and the second screw bolt 410 may rotate by a second motor member 411. A guide rod may be disposed on the rear of the screw bolt, and in FIG. 3, the reference numerals of guide rods 390 and 490 are illustrated as dotted lines.

The support block is fixed to the moving frame 110 and may rotatably support the screw bolt. A screw bolt penetrates the support block, and a bearing is installed inside the support block to rotatably support the screw bolt. For example, in the case of the screw bolt, the external thread of a screw bolt may not be formed on a portion supported by the bearing of the support block to prevent the bearing from being damaged due to friction between the external thread and the bearing.

The moving block may move according to the rotation of the screw bolt. Inside the moving block, an internal thread that engages with the external thread of the screw bolt may be formed, and when the screw bolt rotates, the moving block may move in the vertical direction.

One side of the link member may be connected to the moving block, and the other side thereof may be connected to the rotating plate body 210 of the bending frame 200.

FIG. 5 is a view of FIG. 3 from the ‘I’ direction.

The first driving unit 300 and the second driving unit 400 may further include a guide rod. The first driving unit 300 may include a first guide rod 390, and the second driving unit 400 may include a second guide rod 490.

The guide rod is fixed to the support block and the moving frame 110 and may guide the movement of the moving block.

The guide rod is installed parallel to the screw bolt and may guide the moving block moving on the screw bolt. For example, the guide rod and screw bolt may extend in the vertical direction.

The guide rod is disposed on the rear of the screw bolt, and when viewed from the front, the guide rod and the screw bolt may be disposed in the same position. That is, the screw bolt and the guide rod may be disposed to be spaced apart in the front-back direction and parallel in the vertical direction.

FIG. 6(A) is a diagram illustrating a state in which the material is curved in a downward curved form by the roll bending apparatus and roll bending method according to an embodiment of the present disclosure, FIG. 6(B) is a diagram illustrating a state in which the material is curved in an upwardly curved form by the roll bending apparatus and roll bending method according to an embodiment of the present disclosure.

The bending frame 200 may include a first bending roll 231, a second bending roll 232, and a third bending roll 233 arranged radially at intervals of 120 degrees from the rotation center of the rotating plate body 210.

When forming a curvature in a downward curved shape, the first bending roll 231 and the second bending roll 232 come into contact with the material to form a radius of curvature of the material. When forming a curvature in an upwardly curved shape, the first bending roll 231 and the third bending roll 233 come into contact with the material, to form the radius of curvature of the material.

The operation of the roll bending apparatus is briefly explained as follows.

The transfer roll K or the like may move the material J to allow the material to enter the roll bending apparatus, and the tip of the inserted material J may enter between the adjacent bending rolls 230 of the bending frame 200.

The roll bending apparatus may sequentially bend the first transition zone SN-1, the target curvature zone S2, and the second transition zone SN-2.

First, the moving frame 110 of the roll set frame 100 is moved in the material supply direction, and the first transition zone SN-1 of the material may be bent by supplying the material while rotating the rotating plate body 210 of the bending frame 200 in the first direction. For example, the rotating plate body 210 may rotate clockwise, which is the first direction.

Next, the material may be supplied while the movement of the moving frame 110 is stopped and the rotation of the rotating plate 210 is stopped, and the target curvature zone S2 of the material may be bent after the first transition zone SN-1.

Next, the moving frame 110 of the roll set frame 100 may be moved in the material supply direction, and the second transition zone SN-2 of the material may be bent by supplying the material while rotating the rotating plate body 210 of the bending frame 200 in a second direction opposite to the first direction. For example, the rotating plate body 210 may rotate in the second direction, counterclockwise.

Next, the moving frame 110 of the roll set frame 100 returns to an initial position thereof, and the rotation state of the rotating plate body 210 of the bending frame 200 may also return to the initial state thereof. The roll bending apparatus may bend the material by repeating the above operations.

Next, with reference to FIGS. 7 to 10, the components included in the roll bending method according to an embodiment of the present disclosure will be described in detail.

FIGS. 7 and 8 are diagrams illustrating a roll bending method according to an embodiment of the present disclosure, and FIGS. 9 and 10 are views illustrating enlarged details of the material bent in the roll bending method of FIGS. 7 and 8.

FIGS. 7(A) to 7(D) illustrate the steps of the roll bending apparatus to which the roll bending method is applied in the first step T1, the second step T2, the third step T3, and the fourth step T4, and FIGS. 9(A) to 9(D) illustrate the bending state of the material in the first step T1, the second step T2, the third step T3, and the fourth step T4 of FIGS. 7(A) to 7(D).

FIGS. 8(A) to 8(D) illustrate the steps of the roll bending apparatus to which the roll bending method is applied in the fourth step T4, the fifth step T5, the sixth step T6, and the seventh step T7, and FIGS. 9(A) to 9(D) illustrate the bending state of the material in the fourth step T4, the fifth step T5, the sixth step T6, and the seventh step T7 of FIGS. 8(A) to 8(D).

7(D) FIG. 7(D) and FIG. 8(A) are the same drawing, and FIG. 9(D) and FIG. 10(A) are the same drawing. To explain the successive steps in FIGS. 7 and 8, the same drawings are illustrated in 7(D) FIG. 7(D) and FIG. 8(A), and for explanation of the successive steps in FIGS. 9 and 10, the same drawings are illustrated in FIG. 9(D) and FIG. 10(A).

The first step T1 illustrates the end point of the material entry operation forming the transfer zone S1 and the start point of the first transition zone SN-1. A material entry operation forming the transfer zone Slup to the first step T1 may be performed.

The second step T2 illustrates the starting point of the first transition zone SN-1, and the third step T3 illustrates the end point of the first transition zone SN-1. A first bending operation of bending the first transition zone SN-1 may be performed between the second step T2 and the third step T3.

The fourth step T4 illustrates the end point of the first transition zone SN-1, and a second bending operation of bending the target curvature zone S2 may be performed between the third step T3 and the fourth step T4.

The fifth step T5 illustrates the end point of the second transition zone SN-2, and a third bending operation of bending the second transition zone SN-2 may be performed between the fourth step T4 and the fifth step T5.

The sixth step T6 illustrates the process of forming the transfer zone S1 after the second transition zone SN-2. The seventh step T7 illustrates a return stage in which the moving frame 110 of the roll set frame 100 returns to the initial position thereof and the rotational state of the rotating plate body 210 of the bending frame 200 also returns to the initial state thereof.

The roll bending method according to an embodiment of the present disclosure may include a material entry operation, a first bending operation, and a second bending operation.

Referring to FIG. 7(A) and FIG. 9(A), in the material entry operation, the material may be moved so that the tip of the material enters between the adjacent bending rolls 230 of the bending frame 200. In the material entry operation, the material transfer zone S1 may be formed by passing the non-bending material.

In this case, the transfer zone S1 is a zone in which the material is not bent. In the transfer zone S1, the material has a first radius of curvature R1, and if the supplied material is straight, the first radius of curvature R1 in the transfer zone S1 may have an infinite value.

Referring to FIGS. 7(B) and 7(C) and FIGS. 9(B) and C, a first bending operation of bending the first transition zone SN-1 may be performed between the second step T2 and the third step T3.

In the first bending operation, the moving frame 110 of the frame is moved in the material supply direction and the material is supplied while rotating the bending frame 200 in the first direction, thereby bending the first transition zone SN-1 of the material. In the first bending operation, the movement of the roll set frame 100 may be stopped and the rotation of the rotation frame may be stopped at the end point of the first transition zone SN-1.

In the first bending operation, as the bending frame 200 rotates in the first transition zone SN-1, the positions of the plurality of bending rolls 230 may be adjusted such that at least some of the plurality of bending rolls 230 may press the material so that the material follows the shape of the final product.

For example, the dimensional accuracy of the final product may be improved as the first bending roll 231 and the second bending roll 232 come into contact with the material in the first transition zone SN-1.

In the first bending operation, a first transition zone SN-1 of the material may be formed after the transfer zone S1 of the material. In the first bending operation, the material may be bent while gradually changing the curvature of the material from the first radius of curvature R1 to the second radius of curvature R2.

Referring to FIGS. 7(C) and D and FIGS. 9C and D, a second bending operation of bending the target curvature zone S2 may be performed between the third step T3 and the fourth step T4.

In the second bending operation, the material is supplied while the movement of the moving frame 110 is stopped and the rotation of the bending frame 200 is stopped, thereby bending the target curvature zone S2 of the material after the first transition zone SN-1. In the second bending operation, the target curvature zone S2 of the material may be formed after the first transition zone SN-1 of the material.

In the material entry operation, the first bending operation and the second bending operation may be performed sequentially.

The first transition zone SN-1 is a zone in which the material is bent while the curvature of the material changes from the first radius of curvature R1, which is the initial radius of curvature of the material, to the second radius of curvature R2, which is the target radius of curvature of the material. The target curvature zone S2 may be a zone in which a certain portion of the material is bent to the second radius of curvature R2 after the first transition zone SN-1.

The roll bending method may further include a third bending operation, and the third bending operation may be performed after the second bending operation.

Referring to FIGS. 8(A) and 8(B) and FIGS. 10(A) and 10(B), a third bending operation of bending the second transition zone SN-2 may be performed between the fourth step T4 and the fifth step T5.

In the third bending operation, while moving the moving frame 110 in the material supply direction and rotating the bending frame 200 in the second direction opposite to the first direction, the material is supplied so that the second transition zone SN-2 of the material may be bent after the target curvature zone S2. In the third bending operation, the material may be bent while gradually changing the curvature of the material from the second radius of curvature R2 to the first radius of curvature R1.

In the third bending operation, in the second transition zone SN-2, as the bending frame 200 rotates, the positions of the plurality of bending rolls 230 may be adjusted such that at least some of the plurality of bending rolls 230 may press the material so that the material follows the shape of the final product.

For example, in the second transition zone SN-2, the first bending roll 231 and the third bending roll 233 come into contact with the material, thereby improving the dimensional accuracy of the final product.

The material entry operation, the first bending operation, the second bending operation, and the third bending operation may be performed sequentially.

Referring to FIG. 8(C) and FIG. 10(C), the transfer zone S1 of the material may be formed after the second transition zone SN-2 in the sixth step T6.

Next, referring to FIG. 8(D) and FIG. 10(D), in the return stage, the moving frame 110 of the roll set frame 100 returns to the initial position, and the rotational state of the rotating plate body 210 of the bending frame 200 may also be returned to the initial state thereof.

The second transition zone SN-2 may be a zone in which the material is bent while the curvature of the material changes from the second radius of curvature R2, which is the target radius of curvature of the material, to the first radius of curvature R1, which is the initial radius of curvature of the material.

In the first bending operation, when bending the material in the first transition zone SN-1, the moving frame 110 is moved at a speed corresponding to the supply speed of the material, and in the third bending operation, when bending the material in the second transition zone SN-2, the moving frame 110 may be moved at a speed corresponding to the supply speed of the material.

In addition, of course, various embodiments of the roll bending apparatus having various embodiments described above may be applied to the roll bending method of the present disclosure.

Therefore, the configuration of the roll set frame 100, the bending frame 200, the first driving unit 300, the second driving unit 400, and the like of the roll bending apparatus used in the roll bending method is the same as the configuration of the roll bending apparatus as already described, and thus, detailed description thereof is omitted to avoid duplication.

Although the embodiments of the present disclosure have been described in detail above, the scope of the present disclosure is not limited thereto, and it will be apparent to those skilled in the art that various modifications and variations may be made without departing from the technical spirit of the present disclosure as set forth in the claims.

DESCRIPTION OF REFERENCE CHARACTERS

- 100: Roll Set Frame 110: Moving Frame
- 130: Support Frame 131: Guide Rail
- 200: Bending Frame 210: Rotating Plate Body
- 230: Bending Roll 231: First Bending Roll
- 232: Second Bending Roll 233: Third Bending Roll
- 300: First Driving Unit 310: First Screw Bolt
- 311: First Motor Member 330: First Support Block
- 350: First Moving Block 370: First Link Member
- 390: First Guide Rod 400: Second Driving Unit
- 410: Second Screw Bolt 411: Second Motor Member
- 430: Second Support Block 450: Second Moving Block
- 470: Second Link Member 490: Second Guide Rod
- J: Material K: Transfer Roll R1: First Radius of Curvature R2: Second Radius of

Curvature

- Rn: Nth Radius of Curvature S1: Transfer Zone
- Sn-1: First Transition Zone Sn-2: Second Transition Zone
- S2: Target Curvature Zone T1: First Step
- T2: Second Step T3: Third Step
- T4: Fourth Step T5: Fifth Step
- T6: Sixth Step T7: Seventh Step

ROLL BENDING MACHINE AND ROLL BENDING METHOD

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