Roll bending device and roll bending method

Abstract

The present invention provides a roll bending device including a movably mounted roll set frame; and a bending frame having a plurality of bending rolls for bending a material, the bending frame rotating on the roll set frame to adjust the positions of the plurality of bending rolls.

Description

[Technical field]

[0001] The present invention relates to a roll bending device and a roll bending method. [Background technology]

[0002] It is to be apparent that the material described in this section is merely provided as background information for the present invention and may not constitute prior art.

[0003] The roll forming process is a process in which a coil or a long sheet material is fed into a series of forming rolls and sequentially bent into a beam with a certain cross section by a roll forming device. Once the beam is shaped and passes through the last roll of the roll forming process, various post-processes can be applied according to the final product.

[0004] The roll bending process is a process in which a roll bending device is disposed at the rear end of a roll forming device in the roll forming process to bend a roll-formed straight beam. While the bending roll of the roll bending device rotates, the roll forming device can enter the beam at a constant speed, and a transition zone where the bending curvature of the beam changes while the bending roll rotates may occur.

[0005] The curvature of the transition section may have an arbitrary value, which may result in a decrease in dimensional accuracy of the part, and may cause a problem in that the designed curvature of the part cannot be satisfied. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Korean Utility Model No. 20-1994-0004984 Summary of the Invention [Problem to be solved by the invention]

[0007] One aspect of the present invention is to provide a roll bending device and a roll bending method capable of improving productivity and dimensional accuracy. [Means for solving the problem]

[0008] As one aspect of achieving the above-mentioned object, the present invention provides a roll bending device including: a movably mounted roll set frame; and a bending frame having a plurality of bending rolls for bending a material, the bending frame rotating on the roll set frame to adjust the positions of the plurality of bending rolls.

[0009] The roll set frame may include: a support frame; and a moving frame on which the bending frame is provided and which moves on the support frame along the feed direction of the material.

[0010] When bending the workpiece in the transition section, the moving frame can move on the supporting frame at a speed corresponding to the feed speed of the workpiece.

[0011] The bending frame may include a circular rotating plate rotatably mounted on the moving frame; and a plurality of bending rolls that are rotatably driven on the rotating plate and whose positions are adjusted as the rotating plate rotates.

[0012] In the transition section, the positions of the bending rolls are adjusted while the rotating plate is rotating, and at least some of the bending rolls press the material so that the material conforms to the shape of the final product.

[0013] The bending frame includes a first bending roll, a second bending roll, and a third bending roll arranged radially at intervals of 120 degrees based on the rotation center of the rotating plate, and when forming a curvature in a form in which the material is curved downward, the first bending roll and the second bending roll contact the material to form a radius of curvature of the material, and when forming a curvature in a form in which the material is curved upward, the first bending roll and the third bending roll contact the material to form a radius of curvature of the material.

[0014] The roll bending device may further include: a first driving unit provided on the moving frame and connected to one side of the rotating plate to rotate the rotating plate; and a second driving unit provided on the moving frame and connected to the other side of the rotating plate to rotate the rotating plate together with the first driving unit.

[0015] 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 that moves according to the rotation of the screw bolt; and a link member whose one side is connected to the moving block and whose other side is connected to a rotating plate body of the bending frame.

[0016] The first and second driving units may further include a guide rod fixed to the support block and the moving frame to guide the movement of the moving block.

[0017] As one aspect of achieving the above object, there is provided a roll bending method including: a material entering step of moving a material to enter a leading end of the material between adjacent bending rolls of a bending frame; a first bending step of moving a moving frame of a roll set frame along a material supply direction and supplying the material while rotating the bending frame in a first direction to bend a first transition section of the material; and a second bending step of stopping the movement of the moving frame, supplying the material while stopping the rotation of the bending frame, and bending a target curvature section of the material after the first transition section.

[0018] The first transition section may be a section in which the curvature of the material is changed 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, and the target curvature section may be a section in which a certain section of the material is bent to the second radius of curvature after the first transition section.

[0019] The roll bending method may further include a third bending step of moving the moving frame along a material supply direction and supplying the material while rotating the bending frame in a second direction opposite to the first direction, thereby bending a second transition section of the material after the target curvature section.

[0020] The second transition section may be a section in which the curvature of the material changes from a second radius of curvature, which is a target radius of curvature of the material, to a first radius of curvature, which is an initial radius of curvature of the material.

[0021] The first bending step may move the moving frame at a speed corresponding to a feed speed of the material when bending the material in the first transition section, and the third bending step may move the moving frame at a speed corresponding to a feed speed of the material when bending the material in the second transition section. Effect of the Invention

[0022] According to an embodiment of the present invention, it is possible to improve the productivity and dimensional accuracy of the roll bending device and the roll bending method. [Brief description of the drawings]

[0023] [Figure 1a] 4 is a diagram showing a material bent by a roll bending device and a roll bending method of a comparative example to be compared with the roll bending device and the roll bending method of the present invention. [Figure 1b] 1B is a diagram showing a material bent by a roll bending apparatus and a roll bending method according to an embodiment of the present invention, which is compared with the comparative example of FIG. 1A; [Diagram 2] 1 is a view showing a roll bending device according to an embodiment of the present invention. [Diagram 3] 3 is a diagram showing an enlarged detail of the roll bending device of FIG. 2. [Figure 4a] 3 is a diagram showing a rotation operation of a bending frame of the roll bending device of FIG. 2. [Figure 4a] 3 is a diagram showing a rotation operation of a bending frame of the roll bending device of FIG. 2. [Diagram 5] This is a view of Figure 3 as seen from the "I" direction. [Figure 6] 1A is a diagram showing a state in which a material is curved downward to form a curvature by a roll bending apparatus and a roll bending method according to an embodiment of the present invention, and FIG. 1B is a diagram showing a state in which a material is curved upward to form a curvature by a roll bending apparatus and a roll bending method according to an embodiment of the present invention. [Figure 7] 1 is a diagram illustrating a roll bending method according to an embodiment of the present invention. [Figure 8] 1 is a diagram illustrating a roll bending method according to an embodiment of the present invention. [Figure 9] 8 is an enlarged detailed view of a material being bent by the roll bending method of FIG. 7; [Figure 10] 9 is an enlarged detailed view of a material being bent by the roll bending method of FIG. 8 . DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, preferred embodiments of the present invention will be described with reference to the attached drawings. However, the embodiments of the present invention may be modified into several other forms, and the scope of the present invention is not limited to the embodiments described below. Furthermore, the embodiments of the present invention are provided to more completely explain the present invention to those having average knowledge in the art. The shapes and sizes of elements in the drawings may be scaled (or highlighted or simplified) for clearer explanation.

[0025] In the detailed description of the roll bending device and roll bending method of the present invention, the terms left-right, up-down, and front-rear directions have been used, but this is for convenience of explanation and it is made clear that the technical features of the roll bending device and roll bending method of the present invention are not limited to these directions.

[0026] Before describing the components of the roll bending device and roll bending method according to one embodiment of the present invention, the roll bending device and roll bending method according to the embodiment of the present invention (hereinafter referred to as the "embodiment") will be compared with a roll bending device and roll bending method of a comparative example (hereinafter referred to as the "comparative example") that is contrasted with the present invention.

[0027] FIG. 1a is a diagram showing a material bent by a comparative roll bending apparatus and roll bending method compared to the roll bending apparatus and roll bending method of the present invention, and FIG. 1b is a diagram showing a material bent by a roll bending apparatus and roll bending method according to one embodiment of the present invention compared to the comparative example of FIG. 1a.

[0028] For example, in the embodiment and the comparative example, a material may be bent to form a transfer section S1, a first transition section SN-1, a target curvature section, a second transition section SN-2, and a transfer section S1.

[0029] Here, the transport section S1 is a section where the material is not bent. In the transport section S1, the material has a first radius of curvature R1, and when the material being fed is straight, the first radius of curvature R1 in the transport section S1 may have an infinite value.

[0030] The target curvature section S2 is a section in which a certain section of the material is bent to the second radius of curvature R2 after the first transition section SN-1. In the target curvature section S2, the material can have the second radius of curvature R2.

[0031] The first transition section SN-1 is a section in which the curvature of the material is changed from a first radius of curvature R1, which is the initial radius of curvature of the material before bending, to a second radius of curvature R2, which is the target radius of curvature of the material, as desired.

[0032] The second transition section SN-2 is a section in which 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 before bending, as desired.

[0033] In the first and second transition sections, the material may have an Nth radius of curvature RN, which may vary gradually in curvature between a first radius of curvature R1 in the transfer section S1 and a second radius of curvature R2 in the target curvature section S2.

[0034] Referring to FIG. 1a, in the comparative example, unlike the embodiment of the present invention, the roll set frame 100 does not move along the material supply direction. As a result, it can be seen that dimensional errors occur in the final product produced as the material is pushed at the material supply speed in the first transition section SN-1 and the second transition section SN-2.

[0035] In addition, in the comparative example, the bending frame 200 rotates and the position of the bending roll 230 is not adjusted. As a result, the curvature radius of the material cannot be precisely adjusted from the first transition section SN-1 and the second transition section SN-2, and it can be seen that a large dimensional error occurs in the final product produced compared to the examples.

[0036] Referring to FIG. 1b, in the embodiment, the roll set frame 100 moves along the material supply direction, so that even when the material is supplied from the first transition section SN-1 and the second transition section SN-2, the material is not pushed and no dimensional errors occur.

[0037] Referring to FIG. 1b, in the embodiment, the bending frame 200 rotates and the position of the bending roll 230 is adjusted, so that the radius of curvature of the material can be precisely adjusted from the first transition section SN-1 and the second transition section SN-2, and therefore no dimensional error occurs.

[0038] Hereinafter, components included in a roll bending apparatus according to an embodiment of the present invention will be described in detail with reference to FIGS. 2 to 4b.

[0039] FIG. 2 is a view showing a roll bending apparatus according to one embodiment of the present invention, FIG. 3 is a view showing an enlarged detail of the roll bending apparatus of FIG. 2, and FIGS. 4a and 4b are views showing the rotation operation of the bending frame 200 of the roll bending apparatus of FIG. 2.

[0040] The roll bending apparatus according to an embodiment of the present invention may include a roll set frame 100 and a bending frame 200 .

[0041] The roll set frame 100 may be provided to be movable. As an example, the roll set frame 100 may be provided to be movable along the supply direction of the material.

[0042] The moving frame 110 of the roll-set frame 100 can move at a speed corresponding to the feed speed of the material. As an example, the roll-set frame 100 can move from left to right, which is a direction corresponding to the feed direction of the material.

[0043] The blank J can be moved to a roll bending device such as a transfer roll K so that the leading end of the blank J can be inserted between adjacent bending rolls 230 of the bending frame 200. For example, the blank J manufactured by a roll forming method can be fed at a constant speed by the transfer roll K.

[0044] The bending frame 200 has a plurality of bending rolls 230 for bending a material, and the positions of the plurality of bending rolls 230 can be adjusted while rotating on the roll set frame 100.

[0045] It can be seen that in the bending roll device, the roll set frame 100 moves along the material supply direction, so that even when the material is supplied from the first transition section SN-1 and the second transition section SN-2, the material is not pressed and no dimensional errors occur.

[0046] In the bending roll device, the positions of the multiple bending rolls 230 are adjusted so that at least some of the multiple bending rolls 230 can pressurize the material so that the material conforms to the shape of the final product while the bending frame 200 rotates, and therefore the radius of curvature of the material can be precisely adjusted in the first transition section SN-1 and the second transition section SN-2, and therefore no dimensional errors occur.

[0047] The roll-set frame 100 may include a moving frame 110 and a support frame 130 .

[0048] The support frame 130 may have a guide rail 131 that guides the moving frame 110 to move along the material supply direction. The guide rail 131 may be installed on a front surface of the support frame 130, and the guide rail 131 may be formed to extend in the left-right direction and may be installed in a pair spaced apart in the up-down direction.

[0049] The moving frame 110 is provided with a bending frame 200 and can move on the supporting frame 130 along the feed direction of the material.

[0050] For example, the moving frame 110 may be provided with a bending frame 200, a first driving unit 300, and a second driving unit 400. A guide rail 131 is disposed on the rear surface of the moving frame 110, and the moving frame 110 may be provided to be movable in the left-right direction on the guide rail 131. When a material is supplied from the left side to the right side, the moving frame 110 may also move from the left side to the right side.

[0051] When bending the material in the transition section, the movable frame 110 can move at a speed corresponding to the material supply speed on the guide rail 131. As a result, an additional degree of freedom is given to the material supply direction while the movable frame 110 moves, and the movement of the material and the movable frame 110 can be synchronized to minimize the occurrence of dimensional errors in the material in the transition section.

[0052] For example, when bending the material in the transition section, the moving frame 110 can move on the guide rail 131 at the same speed as the material is fed.

[0053] The bending frame 200 may include a rotating plate 210 and a plurality of bending rolls 230 .

[0054] The rotating plate 210 may be rotatably mounted on the moving frame 110. The rotating plate 210 may have a circular shape and may be rotatably mounted on the moving frame 110 using a rotation axis as a medium.

[0055] As the rotating plate 210 rotates on the moving frame 110, the positions of the multiple bending rolls 230 are adjusted so that at least some of the multiple bending rolls 230 can pressurize the material so that the material conforms to the shape of the final product.

[0056] The bending rolls 230 are rotatably driven on the rotating plate 210, and their positions may be adjusted as the rotating plate 210 rotates. The bending rolls 230 may bend the material while contacting the material, and the bending rolls 230 may be rotatably driven by a bending motor (not shown), etc.

[0057] The bending rolls 230 may be arranged radially based on the rotation center of the rotating plate 210. As an example, the rotating plate 210 may be provided with a first bending roll 231, a second bending roll 232, and a third bending roll 233.

[0058] In the transition section, the positions of the bending rolls 230 are adjusted while the rotating plate 210 rotates, and at least some of the bending rolls 230 press the material so that the material can follow the shape of the final product.

[0059] The transition section is a section in which the curvature of the material changes between a first radius of curvature R1, which is the initial radius of curvature of the material, and a second radius of curvature R2, which is the target radius of curvature of the material, while the material is being bent. As an example, when an unbent straight material is supplied to the roll bending device, the first radius of curvature R1 can have a value of infinity.

[0060] The transition section may include a first transition section SN-1 and a second transition section SN-2. The first transition section SN-1 is a section in which the curvature of the material changes from a first radius of curvature R1, which is the initial radius of curvature of the material before bending, to a second radius of curvature R2, which is the target radius of curvature of the material, to an arbitrary curvature, and the second transition section SN-2 is a section in which 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 before bending, to an arbitrary curvature.

[0061] In the roll bending device, the positions of the plurality of bending rolls 230 can be adjusted so that at least some of the plurality of bending rolls 230 can pressurize the material so that the material conforms to the shape of the final product while the bending frame 200 rotates in the first and second transition sections.

[0062] As an example, in the first transition section 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, and in the second transition section 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.

[0063] The bending roll device may include a first drive unit 300 and a second drive unit 400 .

[0064] The first driving unit 300 is provided on the moving frame 110 and connected to one side of the rotating plate 210 to rotate the rotating plate 210. The second driving unit 400 is provided on the moving frame 110 and connected to the other side of the rotating plate 210 to rotate the rotating plate 210 together with the first driving unit 300.

[0065] The first and second actuators 300 and 400 may be disposed apart from each other across the bending frame 200. As an example, the first and second actuators 300 and 400 may be disposed apart from each other in the left-right direction.

[0066] The first driving unit 300 and the second driving unit 400 may include a screw bolt, a support block, a moving block, and a link member. The first driving unit 300 may include a first screw bolt 310 rotated by a first motor member 311, a first support block 330, a first moving block 350, and a first link member 370, 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.

[0067] The screw bolts may be rotated by a motor member. For example, the screw bolts may be formed to extend in the vertical direction, and a motor member may be disposed on one side of the screw bolts to rotate the screw bolts. The first screw bolt 310 may be rotated by a first motor member 311, and the second screw bolt 410 may be rotated by a second motor member 411. A guide rod may be disposed behind the screw bolts, and therefore, in FIG. 3, the reference numerals of the guide rods 390 and 490 are indicated by dotted lines.

[0068] The support block is fixed to the moving frame 110 and can rotatably support the screw bolt. The screw bolt passes through the support block, and a bearing is provided inside the support block to rotatably support the screw bolt. For example, the screw bolt may not have an external thread 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.

[0069] The moving block can move in response to the rotation of the screw bolt. An internal thread that meshes with the external thread of the screw bolt can be formed inside the moving block, so that the moving block can move up and down when the screw bolt rotates.

[0070] The link member may be connected to the moving block at one side and to the rotating plate 210 of the bending frame 200 at the other side.

[0071] FIG. 5 is a view of FIG. 3 seen from the "I" direction.

[0072] The first and second driving parts 300 and 400 may further include a guide rod. The first driving part 300 may include a first guide rod 390, and the second driving part 400 may include a second guide rod 490.

[0073] The guide rod is fixed to the support block and the moving frame 110 to guide the movement of the moving block.

[0074] The guide rod is provided in parallel with the screw bolt and can guide the moving block that moves on the screw bolt. For example, the guide rod and the screw bolt can be formed to extend in the vertical direction.

[0075] The guide rod may be disposed behind the screw bolt, and the guide rod and the screw bolt may be disposed at the same position when viewed from the front. That is, the screw bolt and the guide rod may be disposed apart from each other in the front-rear direction and parallel to each other in the up-down direction.

[0076] FIG. 6(a) is a diagram showing a state in which a material forms a curvature in a downward curved shape by a roll bending apparatus and a roll bending method according to an embodiment of the present invention, and FIG. 6(b) is a diagram showing a state in which a material forms a curvature in an upward curved shape by a roll bending apparatus and a roll bending method according to an embodiment of the present invention.

[0077] The bending frame 200 may include a first bending roll 231, a second bending roll 232, and a third bending roll 233 that are arranged radially from the rotation center of the rotating plate 210 at intervals of 120 degrees.

[0078] When forming a curvature in the material by curving downward, the first bending roll 231 and the second bending roll 232 can form the radius of curvature of the material while contacting the material, and when forming a curvature in the material by curving upward, the first bending roll 231 and the third bending roll 233 can form the radius of curvature of the material while contacting the material.

[0079] The operation of the roll bending device can be briefly described as follows.

[0080] The transfer roll K or the like can move the material J to cause the material to enter the roll bending device, and the leading end of the material J can enter between the adjacent bending rolls 230 of the bending frame 200.

[0081] The roll bending device can sequentially bend the first transition section SN-1, the target curvature section S2, and the second transition section SN-2.

[0082] First, the moving frame 110 of the roll set frame 100 is moved along the material supply direction, and the material is supplied while rotating the rotating plate 210 of the bending frame 200 in a first direction, thereby bending the first transition section SN-1 of the material. As an example, the rotating plate 210 may rotate in the first direction, that is, clockwise.

[0083] Next, the movement of the moving frame 110 is stopped, and the rotation of the rotating plate 210 is stopped while the material is being fed, so that the target curvature section S2 of the material can be bent after the first transition section SN-1.

[0084] Next, the moving frame 110 of the roll set frame 100 is moved along the material supply direction, and the rotating plate 210 of the bending frame 200 is rotated in a second direction opposite to the first direction to supply the material, thereby bending the second transition section SN-2 of the material. As an example, the rotating plate 210 may rotate in the second direction, i.e., counterclockwise.

[0085] Next, the moving frame 110 of the roll set frame 100 returns to its initial position, and the rotational state of the rotating plate 210 of the bending frame 200 can also return to its initial state. The roll bending device can bend the material by repeating the above operations.

[0086] Next, components included in a roll bending method according to an embodiment of the present invention will be described in detail with reference to FIGS.

[0087] 7 and 8 are views showing a roll bending method according to an embodiment of the present invention, and FIGS. 9 and 10 are enlarged views showing details of a material to be bent by the roll bending method of FIGS.

[0088] Figure 7 (a) to (d) show the steps of the roll bending device 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 Figure 9 (a) to (d) show the bending state of the material in the first step T1, the second step T2, the third step T3, and the fourth step T4.

[0089] Figure 8 (a) to (d) show the steps of the roll bending device 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 Figure 9 (a) to (d) show the bending state of the material in the fourth step T4, the fifth step T5, the sixth step T6, and the seventh step T7.

[0090] Fig. 7(d) and Fig. 8(a) are the same drawing, Fig. 9(d) and Fig. 10(a) are the same drawing, Fig. 7(d) and Fig. 8(a) are the same drawing to explain the successive steps of Fig. 7 and Fig. 8, and Fig. 9(d) and Fig. 10(a) are the same drawing to explain the successive steps of Fig. 9 and Fig. 10.

[0091] The first step T1 indicates the end point of the material introduction step forming the transfer section S1 and the start point of the first transition section SN-1. The material introduction step forming the transfer section S1 can be performed up to the first step T1.

[0092] The second step T2 indicates a start point of the first transition section SN-1, and the third step T3 indicates an end point of the first transition section SN-1. A first bending step of bending the first transition section SN-1 may be performed between the second step T2 and the third step T3.

[0093] The fourth step T4 indicates the end point of the first transition section SN-1, and a second bending step of bending the target curvature section S2 can be performed between the third step T3 and the fourth step T4.

[0094] The fifth step T5 indicates the end point of the second transition section SN-2, and a third bending step of bending the second transition section SN-2 may be performed between the fourth step T4 and the fifth step T5.

[0095] The sixth step T6 indicates a process of forming the transfer section S1 after the second transition section SN-2. The seventh step T7 indicates a return step in which the moving frame 110 of the roll set frame 100 returns to its initial position and the rotation state of the rotating plate body 210 of the bending frame 200 also returns to its initial state.

[0096] A roll bending method according to an embodiment of the present invention may include a material entering step, a first bending step, and a second bending step.

[0097] 7(a) and 9(a), the material entry step can move the material so that the leading end of the material enters between adjacent bending rolls 230 of the bending frame 200. In the material entry step, the material that has not been bent can pass through to form a material transfer section S1.

[0098] Here, the transport section S1 is a section where the material is not bent. In the transport section S1, the material has a first radius of curvature R1, and when the material being fed is straight, the first radius of curvature R1 in the transport section S1 may have an infinite value.

[0099] Referring to Figures 7(b) and 7(c) and Figures 9(b) and 9(c), a first bending step of bending a first transition section SN-1 may be performed between the second step T2 and the third step T3.

[0100] In the first bending step, the moving frame 110 of the frame may be moved along the material supply direction, and the bending frame 200 may be rotated in the first direction while supplying the material to bend the first transition section SN-1 of the material. In the first bending step, the roll set frame 100 may stop moving and the rotating frame may stop rotating at the end point of the first transition section SN-1.

[0101] In the first bending step, while the bending frame 200 rotates in the first transition section SN-1, the positions of the plurality of bending rolls 230 can be adjusted so that at least some of the plurality of bending rolls 230 can pressurize the material so that the material conforms to the shape of the final product.

[0102] For example, in the first transition section SN-1, the first bending roll 231 and the second bending roll 232 are in contact with the material, thereby improving the dimensional accuracy of the final product.

[0103] In the first bending step, a first transition section SN-1 of the material can be formed after the material transfer section S1. In the first bending step, the material can be bent while gradually changing the curvature of the material from a first radius of curvature R1 to a second radius of curvature R2.

[0104] Referring to (c) and (d) of FIG. 7 and (c) and (d) of FIG. 9, a second bending step of bending the target curvature section S2 may be performed between the third step T3 and the fourth step T4.

[0105] In the second bending step, the movement of the moving frame 110 is stopped, the rotation of the bending frame 200 is stopped, and the material is fed to bend the target curvature section S2 of the material after the first transition section SN-1. In the second bending step, the target curvature section S2 of the material can be formed after the first transition section SN-1 of the material.

[0106] The material introduction step, the first bending step, and the second bending step may be performed sequentially.

[0107] The first transition section SN-1 is a section in which the curvature of the material changes from a first radius of curvature R1, which is the initial radius of curvature of the material, to a second radius of curvature R2, which is the target radius of curvature of the material, and the target curvature section S2 is a section in which a certain section of the material is bent to the second radius of curvature R2 after the first transition section SN-1.

[0108] The roll bending method may further include a third bending step, which may be performed after the second bending step.

[0109] Referring to Figures 8(a) and 8(b) and Figures 10(a) and 10(b), a third bending step of bending the second transition section SN-2 may be performed between the fourth step T4 and the fifth step T5.

[0110] In the third bending stage, the movable frame 110 is moved along the material supply direction and the bending frame 200 is rotated in a second direction opposite to the first direction to supply the material, thereby bending the material in the second transition section SN-2 after the target curvature section S2. In the third bending stage, the material can be bent while the curvature of the material is gradually changed from the second curvature radius R2 to the first curvature radius R1.

[0111] In the third bending step, while the bending frame 200 rotates in the second transition section SN-2, the positions of the plurality of bending rolls 230 can be adjusted so that at least some of the plurality of bending rolls 230 can pressurize the material so that the material conforms to the shape of the final product.

[0112] For example, the first bending roll 231 and the third bending roll 233 contact the material in the second transition section SN-2, thereby improving the dimensional accuracy of the final product.

[0113] The material introduction step, the first bending step, the second bending step, and the third bending step may be performed in sequence.

[0114] Referring to FIG. 8(c) and FIG. 10(c), in the sixth step T6, a material transfer section S1 may be formed after the second transition section SN-2.

[0115] Next, referring to FIG. 8(d) and FIG. 10(d), in the return step, the moving frame 110 of the roll set frame 100 is returned to its initial position, and the rotation state of the rotating plate body 210 of the bending frame 200 can also be returned to its initial state.

[0116] The second transition section SN-2 may be a section in which the curvature of the material is changed from a second radius of curvature R2, which is a target radius of curvature of the material, to a first radius of curvature R1, which is an initial radius of curvature of the material, while the material is bent.

[0117] The first bending stage moves the moving frame 110 at a speed corresponding to the feed speed of the material when bending the material in the first transition section SN-1, and the third bending stage moves the moving frame 110 at a speed corresponding to the feed speed of the material when bending the material in the second transition section SN-2.

[0118] It goes without saying that the various embodiments of the roll bending apparatus having the various embodiments described above can be applied to the roll bending method of the present invention.

[0119] Therefore, the configurations of the roll set frame 100, bending frame 200, first driving unit 300, and second driving unit 400 of the roll bending device used in the roll bending method are the same as those of the roll bending device as already described, so detailed descriptions thereof will be omitted to avoid duplication.

[0120] Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and it will be obvious to those having ordinary skill in the art that various modifications and variations are possible within the scope that does not deviate from the technical idea of ​​the present invention described in the claims. [Explanation of symbols]

[0121] 100 Roll set frame 110 Moving frame 130 Support frame 131 Guide rail 200 bending frame 210 rotating plate 230 bending roll 231 first bending roll 232 2nd bending roll 233 3rd bending roll 300 first drive 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 drive unit 410 second screw bolt 411 second motor member 430 2nd support block 450 2nd moving block 470 second link member 490 second guide rod J Material K Transfer roll R1 1st radius of curvature R2 2nd radius of curvature RN Nth curvature radius S1 Transfer section SN-1 First transition section SN-2 Second transition section S2 Target curvature section T1 First step T2 2nd step T3 3rd step T4 4th step T5 5th step T6 6th step T7 7th step

Claims

1. A movably provided roll set frame; a bending frame having a plurality of bending rolls for bending a material, the bending frame rotating on the roll set frame to adjust the positions of the bending rolls; A roll bending device comprising:

2. The roll set frame is A support frame; a moving frame that is provided with the bending frame and moves along the material supply direction on the support frame; The roll bending apparatus of claim 1 .

3. 3. The roll bending device according to claim 2, wherein when bending the workpiece in the transition section, the moving frame moves on the support frame at a speed corresponding to a feed speed of the workpiece.

4. The bending frame is A circular rotating plate body rotatably provided on the moving frame; a plurality of bending rolls that are rotationally driven on the rotary plate and whose positions are adjusted as the rotary plate rotates; The roll bending apparatus of claim 2 .

5. 5. The roll bending device according to claim 4, wherein the positions of the bending rolls are adjusted while the rotating plate rotates in the transition section, and at least some of the bending rolls press the material so that the material conforms to the shape of the final product.

6. The bending frame is The bending roll further includes a first bending roll, a second bending roll, and a third bending roll, which are arranged radially at intervals of 120 degrees with respect to the rotation center of the rotating plate body, When forming a curvature in a downwardly curved form on the material, the first bending roll and the second bending roll contact the material to form a curvature radius of the material, The roll bending device according to claim 4, wherein when forming a curvature in an upwardly curved shape of the workpiece, the first bending roll and the third bending roll form a radius of curvature of the workpiece while contacting the workpiece.

7. a first driving unit provided on the moving frame and connected to one side of the rotating plate to rotate the rotating plate; a second driving unit provided on the moving frame and connected to the other side of the rotating plate to rotate the rotating plate together with the first driving unit; The roll bending apparatus of claim 4 further comprising:

8. The first driving unit and the second driving unit are 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 that moves in response to rotation of the screw bolt; a link member connected at one side to the moving block and at the other side to the rotating plate of the bending frame; The roll bending apparatus of claim 7, comprising:

9. The first driving unit and the second driving unit are A guide rod fixed to the support block and the moving frame to guide the movement of the moving block. The roll bending apparatus of claim 8 further comprising:

10. a workpiece entry step of moving the workpiece so that a leading end of the workpiece is entered between adjacent bending rolls of the bending frame; a first bending step of bending a first transition section of the material by moving a moving frame of the roll set frame along a material supply direction and supplying the material while rotating a bending frame in a first direction; a second bending step of supplying a workpiece while stopping the movement of the moving frame and the rotation of the bending frame, and bending a target curvature section of the workpiece after the first transition section; A roll bending method comprising:

11. The first transition section is a section in which the curvature of the material is changed from a first curvature radius, which is an initial curvature radius of the material, to a second curvature radius, which is a target curvature radius of the material, while the material is bent, The roll bending method according to claim 10, wherein the target curvature section is a section in which a certain section of the material is bent with the second radius of curvature after the first transition section.

12. 12. The roll bending method according to claim 11, further comprising: a third bending step of: moving the moving frame along a material supply direction and rotating the bending frame in a second direction opposite to the first direction to supply the material, thereby bending a second transition section of the material after the target curvature section.

13. The roll bending method according to claim 12, wherein the second transition section is a section in which the curvature of the material changes from a second radius of curvature, which is a target radius of curvature of the material, to a first radius of curvature, which is an initial radius of curvature of the material.

14. The first bending step includes moving the moving frame at a speed corresponding to a feeding speed of the workpiece when bending the workpiece in the first transition section, The roll bending method according to claim 13, wherein in the third bending step, the moving frame is moved at a speed corresponding to a feed speed of the workpiece when bending the workpiece in the second transition section.

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