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 understood 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 long sheet material is fed into a series of forming rolls and bent sequentially to produce a beam with a uniform cross section using a roll forming device. Once the formed beam passes through the last roll of the roll forming process, various post-processes can be applied depending on 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 advance the beam at a constant speed, and a transition zone where the bending curvature of the beam changes may occur while the bending roll rotates.

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

[0006] [Patent Document 1] Korean Utility Model Patent 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 that can improve productivity and dimensional accuracy. [Means for solving the problem]

[0008] In one aspect of achieving the above 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 can include a support frame; and a moving frame on which the bending frame is provided and which moves along the material supply direction on the support frame.

[0010] When bending the material in the transition section, the moving frame can move on the support frame at a speed corresponding to the feeding speed of the material.

[0011] The bending frame may include a circular rotating plate rotatably mounted on the moving frame; and a plurality of bending rolls that are rotationally 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 that are arranged radially at intervals of 120 degrees from the rotation center of the rotating plate. When forming a curvature in a form in which the material is bent 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 bent 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 connected to the moving block on one side and connected to a rotating plate of the bending frame on the other side.

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

[0017] In 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 movable frame of a roll set frame along a material feeding direction and feeding the material while rotating the bending frame in a first direction, thereby bending a first transition section of the material; and a second bending step of stopping the movement of the movable frame, feeding 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 changes from a first radius of curvature, which is the initial radius of curvature of the material, to a second radius of curvature, which is the 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 feeding direction and feeding 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 the 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 the feed speed of the material when bending the material in the second transition section. [Effects 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 explanation of the drawings]

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

[0024] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can 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 the 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 view showing a material bent by a comparative roll bending device and roll bending method, which are compared with the roll bending device and roll bending method of the present invention, and FIG. 1b is a view showing a material bent by a roll bending device and roll bending method according to an embodiment of the present invention, which are compared with 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 if the material being fed is straight, the first radius of curvature R1 in the transport section S1 can 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 changes from the first curvature radius R1, which is the initial curvature radius of the material before bending, to the second curvature radius R2, which is the target curvature radius 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 curvature radius R2, which is the target curvature radius of the material, to the first curvature radius R1, which is the initial curvature radius 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 gradually change 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, the material is pushed at the material supply speed in the first transition section SN-1 and the second transition section SN-2, resulting in dimensional errors in the final product.

[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 example.

[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 dimensional errors do not 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, dimensional errors do not occur.

[0038] Hereinafter, components included in a roll bending device 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 device according to an embodiment of the present invention, FIG. 3 is a view showing an enlarged detail of the roll bending device of FIG. 2, and FIGS. 4a and 4b are views showing the rotational operation of the bending frame 200 of the roll bending device of FIG. 2.

[0040] A 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. For example, the roll set frame 100 may be provided to be movable along the material supply direction.

[0042] The moving frame 110 of the roll set frame 100 can move at a speed corresponding to the feed speed of the material. For example, the roll set frame 100 can move from left to right, which corresponds 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, and 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 a transfer roll K or the like.

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

[0045] In the bending roll device, the roll set frame 100 moves along the material supply direction, so 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 dimensional errors do not occur.

[0046] In the bending roll device, the positions of the plurality of bending rolls 230 are 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, and thus 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 it can be seen that dimensional errors do not 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 in the material supply direction. The guide rail 131 may be installed on the 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 pairs spaced apart in the up-down direction.

[0049] The moving frame 110 is provided with a bending frame 200 and can move on the support 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 left and right on the guide rail 131. When 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 moving frame 110 can move at a speed corresponding to the material supply speed on the guide rail 131. As a result, as the moving frame 110 moves, it is possible to provide additional freedom in the material supply direction and synchronize the movement of the material and the moving frame 110, thereby minimizing 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 feed speed.

[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 via a rotation axis.

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

[0056] The plurality of bending rolls 230 are rotatably driven on the rotary plate 210, and their positions may be adjusted as the rotary plate 210 rotates. The bending rolls 230 may bend the material while coming into contact with the material, and the bending rolls 230 may be rotated by a bending motor (not shown), etc.

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

[0058] As the rotary plate 210 rotates in the transition section, the positions of the bending rolls 230 are adjusted, and at least some of the bending rolls 230 press the material so that the material can conform to 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. For example, when an unbent straight material is fed to the roll bending device, the first radius of curvature R1 can have an infinite value.

[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 curvature radius R1, which is the initial curvature radius of the material before bending, to a second curvature radius R2, which is the target curvature radius 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 curvature radius R2, which is the target curvature radius of the material, to the first curvature radius R1, which is the initial curvature radius 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] For 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 driving unit 300 and a second driving 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 driving units 300 and 400 may be spaced apart from each other across the bending frame 200. For example, the first and second driving units 300 and 400 may be spaced 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 can be rotated by a motor member. For example, the screw bolts may be formed to extend vertically, 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. Guide rods may be disposed behind the screw bolts, and therefore, the reference numerals for the guide rods 390 and 490 are indicated by dotted lines in FIG. 3.

[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 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.

[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 parallel to 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 spaced apart in the front-rear direction and parallel to each other in the up-down direction.

[0076] FIG. 6(a) is a view showing a state in which a material is curved downward to form a curvature by a roll bending device and a roll bending method according to an embodiment of the present invention, and FIG. 6(b) is a view showing a state in which a material is curved upward to form a curvature by a roll bending device 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 rotary plate 210 at intervals of 120 degrees.

[0078] When forming a curvature in the material by bending it 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 bending it 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 explained as follows.

[0080] The transfer roll K or the like can move the material J to make the material enter the roll bending device, and the leading end of the entered 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 movable 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 first direction to supply the material and bend the first transition section SN-1 of the material. For example, the rotating plate 210 may rotate in the first direction, i.e., clockwise.

[0083] Next, the movement of the moving frame 110 is stopped, and the rotation of the rotating plate 210 is stopped, and the material is supplied, and the target curvature section S2 of the material can be bent from the first transition section SN-1 onwards.

[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 material in the second transition section SN-2. For 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 also returns 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] (a) to (d) of Figure 7 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 (a) to (d) of Figure 9 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, fifth step T5, sixth step T6, and seventh step T7, and Figure 9 (a) to (d) show the bending state of the material in the fourth step T4, fifth step T5, sixth step T6, and seventh step T7.

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

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

[0092] The second step T2 indicates the start point of the first transition section SN-1, and the third step T3 indicates the end point of the first transition section SN-1. A first bending step of bending the first transition section SN-1 can 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 can be performed between the fourth step T4 and the fifth step T5.

[0095] The sixth step T6 represents the process of forming the transfer section S1 after the second transition section SN-2. The seventh step T7 represents the 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 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 entry step, a first bending step, and a second bending step.

[0097] 7(a) and 9(a), the material entry step moves 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, unbent material 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 if the material being fed is straight, the first radius of curvature R1 in the transport section S1 can 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 the first transition section SN-1 can 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 is moved along the material supply direction, and the bending frame 200 is rotated in the first direction while the material is supplied, thereby bending the material through the first transition section SN-1. In the first bending step, the roll set frame 100 may stop moving and the rotating frame may stop rotating at the end of the first transition section SN-1.

[0101] In the first bending step, the bending frame 200 rotates in the first transition section SN-1, and the positions of the bending rolls 230 can be adjusted so that at least some of the 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 come into 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 its curvature is gradually changed from a first radius of curvature R1 to a second radius of curvature R2.

[0104] Referring to (c) and (d) of Figure 7 and (c) and (d) of Figure 9, a second bending step of bending the target curvature section S2 can 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 entry 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 curvature radius R1, which is the initial curvature radius of the material, to a second curvature radius R2, which is the target curvature radius of the material, while the material is bent. The target curvature section S2 may be a section in which a certain section of the material is bent to the second curvature radius 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 8(b), a third bending step of bending the second transition section SN-2 can 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 gradually changing the curvature of the material from the second curvature radius R2 to the first curvature radius R1.

[0111] In the third bending step, 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 second transition section SN-2.

[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 entry step, the first bending step, the second bending step, and the third bending step may be performed sequentially.

[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 (d) of Figure 8 and (d) of Figure 10, in the return stage, 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 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 changes from the second curvature radius R2, which is the target curvature radius of the material, to the first curvature radius R1, which is the initial curvature radius of the material, while the material is being bent.

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

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

[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 description 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 skilled 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 Second bending roll 233 Third 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 Second support block 450 Second 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 positions of the plurality of bending rolls being adjusted while rotating on the roll set frame; Including, The roll set frame is A support frame; a moving frame provided with the bending frame and moving along the material feeding direction on the support frame; Including, A roll bending device, wherein when bending the material in the transition section, the moving frame moves on the support frame at a speed corresponding to the feed speed of the material, and the bending frame rotates on the moving frame.

2. The bending frame is a circular rotating plate rotatably mounted 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 device of claim 1 , comprising:

3. 3. The roll bending device according to claim 2, wherein the positions of the plurality of bending rolls are adjusted while the rotary plate rotates in the transition section, and at least some of the plurality of bending rolls press the material so that the material conforms to the shape of the final product.

4. The bending frame is The bending roll 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, 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, 3. The roll bending device according to claim 2, wherein when forming a curvature in an upwardly curved shape of the workpiece, the first bending roll and the third bending roll form the curvature radius of the workpiece while contacting the workpiece.

5. 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 2 further comprising:

6. 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 device of claim 5, comprising:

7. 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 6 further comprising:

8. A roll bending method utilizing the roll bending device according to any one of claims 1 to 7, a material entry step of moving the material so that a leading end of the material enters between adjacent bending rolls of the bending frame; a first bending step of moving a moving frame of the roll set frame along a material feeding direction and feeding the material while rotating the bending frame in a first direction on the moving frame to bend a first transition section of the material; a second bending step of supplying a material while stopping the movement of the moving frame and the rotation of the bending frame, and bending a target curvature section of the material after the first transition section; A roll bending method comprising:

9. 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 8, 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.

10. 10. The roll bending method according to claim 9, further comprising: a third bending step of feeding the material while moving the moving frame along the material feeding direction and rotating the bending frame on the moving frame in a second direction opposite to the first direction, thereby bending the second transition section of the material after the target curvature section.

11. 11. The roll bending method according to claim 10, 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.

12. the first bending step comprises moving the moving frame at a speed corresponding to a feeding speed of the material when bending the material in the first transition section; The roll bending method according to claim 11, wherein the third bending step comprises moving the moving frame at a speed corresponding to a feed speed of the workpiece when bending the workpiece in the second transition section.

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