Bending apparatus and bending method

Abstract

To provide a bending apparatus which accurately performs bending and in which a tension chuck or the like for fixing a workpiece is redundant.SOLUTION: A bending apparatus 1 is equipped with: a curved-shape mold part 20 in which a curved-shape molding surface 21 is formed; and an elastic plate part 30 which can freely convert its state to a normal state α being a flat plate shape and a curved state being a bent shape. In the bending apparatus, the elastic plate part 30 converts its state to the curved state while performing crimping from the other side of the workpiece W and performs the crimping such that the workpiece W follows the curved-shape molding surface 21, thereby bending the workpiece W into a prescribed shape.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a bending apparatus for bending a long workpiece so as to bend the workpiece in a predetermined direction, and a method for bending a workpiece. [Background technology]

[0002] Conventionally, as a bending device for bending a long workpiece in a predetermined direction, a stretch bender has been known, for example, as disclosed in Patent Document 1. In such a stretch bender, both ends of the workpiece are fixed to tension chucks, and the workpiece is stretched by a tension cylinder, and then pressed against a die to perform bending. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2000-237825 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned stretch bending machine, both ends of the workpiece are fixed to the tension chuck, so the both ends cannot be processed. Also, since the tension cylinder rotates around the die to process the workpiece while pulling it, a large space is required.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a bending apparatus that does not require a tension chuck or the like for fixing a workpiece and that can perform bending with high accuracy.

[0006] Another object of the present invention is to provide a bending method that does not require a tension chuck or the like for fixing a workpiece and that can perform bending with high accuracy. [Means for solving the problem]

[0007] The present invention is a bending device for bending a long workpiece having a shape in which an axis extending in the long direction is linear so as to bend the workpiece in a predetermined direction to obtain a bent product, the bending device comprising: a base portion; a curved shape mold portion disposed on the base portion and having a curved shape forming surface formed by pressing a side surface of one side of the workpiece against the workpiece with both ends of the workpiece being free ends, the curved shape forming surface forming the curved workpiece in the predetermined direction; an elastic plate portion having a long, elastically deformable band shape and capable of changing its state from a normal state in which it is not elastically deformed to a curved state in which it is elastically deformed and bent; and an elastically deformable elastic plate portion contacting the other side surface of the workpiece and being long in a direction coinciding with the longitudinal direction of the workpiece. and an elastic linear mold part, wherein when the elastic linear mold part is in contact with the other side of the workpiece and one side of the workpiece is placed against the curved forming surface of the curved mold part, one side of the elastic plate part, whose longitudinal direction in the normal state coincides with the longitudinal direction of the elastic linear mold part, is pressed against the side of the elastic linear mold part opposite the side on which the workpiece is arranged, and is transformed into the curved state, so that the workpiece is pressed together with the elastic linear mold part while deforming to fit along the curved forming surface, and the workpiece is curved in the specified direction.

[0008] In this configuration, one side of the workpiece is successively pressed against the curved shape forming surface while the elastic plate portion is elastically deformed and curved. This eliminates the need for a tension chuck or the like that pulls both ends of the workpiece, and both ends of the workpiece can be bent in a free end state without any constraint. This eliminates the need to provide a holding margin for chucking at both ends of the workpiece, and the yield rate of the workpiece base material is dramatically improved. In addition, a bent product with a precise R processing can be obtained up to the end of the workpiece. The elastic linear mold portion and the elastic plate portion are made of a material that can be elastically deformed, so they can be used repeatedly.

[0009] Also proposed is a configuration which includes a roller portion arranged on the opposite side of the curved shape molding surface of the curved mold portion with respect to the elastic plate portion, and the roller portion is pressed against the elastic plate portion that has been converted into the curved state and rolls on the other side of the elastic plate portion along the longitudinal direction of the elastic plate portion.

[0010] With this configuration, the workpiece is pressed against the curved forming surface while properly conforming to the curved shape, and the accuracy of bending the workpiece can be further improved.

[0011] Furthermore, the present invention provides a bending method for obtaining a bent product by bending a long workpiece having a shape in which an axis extending in the long direction is linear so as to bend the workpiece in a predetermined direction, the bending method comprising the steps of: arranging the workpiece so that one side of the workpiece faces a curved mold part having a curved shape forming surface formed thereon, the curved shape forming surface being pressed against the side of the workpiece on one side while both ends of the workpiece are free ends, and placing the side of the workpiece on one side against the curved shape forming surface; and contacting the other side of the workpiece with an elastic linear mold part that is elongated in a direction coinciding with the longitudinal direction of the workpiece and that is elastically deformable; and, after the preparation step, The bending method is characterized by including a bending process step in which an elastic plate section which has a freely shaped strip shape and can be freely transformed from a normal, non-elastically deformed state to a curved state in which it is elastically deformed and bent is transformed into the curved state by pressing one side of the elastic plate section against a side of the elastic linear mold section opposite to the side on which the workpiece is arranged, while aligning the longitudinal direction of the elastic plate section with the longitudinal direction of the elastic linear mold section in the normal state, thereby deforming and pressing the workpiece together with the elastic linear mold section to conform to the curved shape forming surface, thereby curving the workpiece in the specified direction.

[0012] In this configuration, the workpiece is bent by being pressed against the curved forming surface while being deformed as the elastic plate portion bends, so no fixing means such as a tension chuck for holding the workpiece is required, and there is no need to form holding margins on both ends of the workpiece. This dramatically improves the yield of the base material that constitutes the workpiece. In addition, a bent product with precise R processing can be obtained even at the ends of the workpiece.

[0013] Furthermore, a configuration is proposed that includes a copying process in which a roller portion, arranged on the opposite side of the curved shape forming surface of the curved shape mold portion with respect to the elastic plate portion as a reference, is pressed against the elastic plate portion that has been converted into the curved state while rolling on the other side of the elastic plate portion along the longitudinal direction of the elastic plate portion, thereby copying the workpiece along the curved shape forming surface.

[0014] In this configuration, the workpiece is properly pressed against the curved forming surface, improving the processing accuracy and allowing a highly accurate bent product to be obtained. Effect of the Invention

[0015] The bending apparatus of the present invention does not require a tension chuck or the like for fixing a workpiece, and therefore has the excellent effect of improving yield and producing products that are bent with high precision all the way to the ends.

[0016] Furthermore, the bending method of the present invention does not require a tension chuck or the like for fixing the workpiece, which has the excellent effect of improving yields and enabling the production of products that are precisely bent all the way to the ends. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a perspective view showing an overview of a bending device. [Diagram 2] 10 is a plan view showing a preparation step of a bending method using a bending apparatus, illustrating a state in which a workpiece is placed on a curved mold section. FIG. [Diagram 3]10 is a plan view showing an operation mode of the bending device, illustrating a state in which the elastic plate portion is pressed against a linear mold. FIG. [Figure 4] 10 is a plan view showing an operation mode of the bending device, illustrating a state in which the elastic plate portion is curved while being pressed against a linear mold. FIG. [Diagram 5] 10 is a plan view showing an operation mode of the bending device, illustrating a state in which the roller portion is pressed against the elastic plate portion. FIG. [Figure 6] FIG. 2 is an explanatory diagram showing the appearance of a workpiece and a linear mold. [Figure 7] FIG. 4 is a vertical cross-sectional view showing a state in which a linear mold is attached to a workpiece. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] The embodiment of the present invention will be described according to the examples. Note that the present invention is not limited to the examples shown below, and the design can be modified as appropriate. For convenience, the directions of up, down, front, back, left and right are defined in the examples, but the present invention is not limited thereto.

[0019] 1 and 2, the bending apparatus 1 includes a base portion 10 that is placed on, for example, a floor surface. A curved shape mold portion 20 is disposed on the base portion 10.

[0020] A curved shape forming surface 21 is formed on the side of the curved shape mold portion 20 to bend and curve the long workpiece W (see FIG. 6) in a predetermined direction. Specifically, the workpiece W is made of a metal member that is long and has a so-called straight shape in which the axis L (see FIG. 6) extending in the long direction is linear. In contrast, the curved shape forming surface 21 has a curved shape that follows an outwardly convex arc in a plan view, for example, and has an uneven shape that corresponds to the uneven shape formed on the side of the workpiece W.

[0021] In addition, a metal elastic plate 30 having an elastically deformable band shape is disposed on the base 10 at a position facing the curved shape forming surface 21. The elastic plate 30 is flat in the normal state α shown in Figs. 1 and 2. Elastic plate deformation means 31, 31 constituted by a chuck or the like for holding the elastic plate 30 are disposed on both ends of the elastic plate 30, and the elastic plate 30 is freely transformed into a curved state β in which the elastic plate 30 is bent so as to follow the curved shape of the curved shape forming surface 21 by the elastic plate deformation means 31 moving in a predetermined manner. For example, when the elastic plate deformation means 31, 31 approach each other, the elastic plate 30 is in a bent state, or when the elastic plate deformation means 31, 31 approach the curved shape forming surface 21, the elastic plate 30 is in a state of pressing the workpiece W against the curved shape forming surface 21.

[0022] The elastic plate deformation means 31 is electrically connected to a processing control means 32 constituted by a CPU or the like, and is controlled by the processing control means 32.

[0023] Furthermore, roller units 40, 40 made of cylindrical bodies with their rotation axis in the up-down direction are disposed on the opposite side of curved shape forming surface 21 with respect to elastic plate portion 30 as a reference. Roller units 40, 40 can be pressed against one of the side surfaces of elastic plate portion 30 that is opposite curved shape forming surface 21 with respect to elastic plate portion 30 as a reference, and have the function of moving along the longitudinal direction of elastic plate portion 30 and rolling on said side surface of elastic plate portion 30. Roller units 40, 40 are held by roller unit moving means 41, 41, respectively, and the moving direction, etc. of roller unit moving means 41, 41 is controlled by roller unit control means 42 constituted by, for example, a CPU or the like.

[0024] 6 and 7, a linear mold 50 made of an elongated elastically deformable resin material is attached in advance to the workpiece W to be bent by the bending apparatus 1. Specifically, the linear mold 50 has one side portion 51 having an uneven shape corresponding to the shape of the other side surface W2 of the workpiece W, and the other side portion 52 made of a flat surface. The workpiece W and the linear mold 50 are assembled together in such a manner that the longitudinal direction of the workpiece W and the longitudinal direction of the linear mold 50 coincide with each other.

[0025] [Preparation process] When bending the workpiece W using the bending device 1 described above, first, the workpiece W to which the linear mold 50 is attached is placed between the curved shape forming surface 21 and the elastic plate portion 30 in the normal state α. At this time, the workpiece W is placed so that the curved shape forming surface 21 and one side surface W1 of the workpiece W face each other. Preferably, the workpiece W is placed in a state in which a part of the side surface W1 of the workpiece W abuts against the part of the curved shape forming surface 21 closest to the elastic plate portion 30 (the part protruding toward the elastic plate portion 30). In addition, when the linear mold 50 and the workpiece W are assembled, the other side surface W2 of the workpiece W and one side portion 51 of the linear mold 50 are in surface contact with each other.

[0026] [Bending process] 3, 4, and 5, the elastic plate portion 30 is pressed against the other side portion 52 of the linear mold 50 to press the workpiece W against the curved forming surface 21. At this time, the other side portion 52 of the linear mold 50 functions as a receiving surface that receives the pressing force from the elastic plate portion 30.

[0027] In parallel, the elastic plate portion 30 is transformed into a curved state β so as to bend, and while the linear mold 50 is elastically deformed and curved, the workpiece W is also deformed so as to bend in the same manner, and one side surface W1 of the workpiece W is pressed against the curved shape forming surface 21 and gradually fits. In this changing state, the workpiece W positioned between the curved shape forming surface 21 and the elastic plate portion 30 is bent appropriately. Note that both ends of the workpiece W are free ends that are not restrained in any way, so according to the present invention, the workpiece W can be curved up to its terminal. In addition, since the elastic plate portion 30 is configured to press the workpiece W via the elastically deformable linear mold 50, it is possible to suppress localized stress increase in the workpiece W.

[0028] The machining control means 32 executes control to move the elastic plate portion deformation means 31 in such a manner that the workpiece W is pressed against the curved shape forming surface 21 and deformed along the curved shape forming surface 21.

[0029] [Copying process] After the elastic plate portion 30 transitions to the curved state β, the roller portions 40, 40 are pressed against the elastic plate portion 30 from the side opposite the curved shape forming surface 21 of the elastic plate portion 30 (the lower side in FIG. 5). Then, while maintaining the pressed state, the roller portions 40, 40 are rolled along the longitudinal direction of the elastic plate portion 30 to make the workpiece W conform to the curved shape forming surface 21. This allows the workpiece W to be pressed against the curved shape forming surface 21 more strongly while dispersing the local pressure applied to the workpiece W and eliminating the occurrence of partial unevenness, wrinkles, and the like.

[0030] The movement of the roller parts 40, 40 along the longitudinal direction of the elastic plate part 30 and the movement toward and away from the elastic plate part 30 are performed by roller part moving means 41, 41 controlled by roller part control means 42.

[0031] By going through the steps described so far, a bent product derived from the workpiece W can be obtained. When processing the next bent product, the pressing state of the elastic plate portion 30 is released through the reverse steps, and then a new preparation step can be started. The elastic plate portion 30 and the linear mold 50 have restorability and can be used repeatedly. The roller portion 40 also has the function of improving distortion that occurs in the elastic plate portion 30 after repeated use.

[0032] In the above embodiment, the dimensions and shapes of each part can be freely selected as appropriate. For example, the configuration is not limited to one in which both ends of the elastic plate portion 30 are held by the elastic plate portion deformation means 31, and it may be one in which only one of the elastic plate portion deformation means 31 operates. Also, it may be a configuration in which the curved shape forming surface 21 of the curved shape mold portion 20 is disposed facing upward, and the elastic plate portion 30 bends the workpiece W while pressing it downward. [Explanation of symbols]

[0033] 1 Bending equipment 10 Base 20 Curved Shape Part 21 Curved shape forming surface 30 Elastic plate 31 Elastic plate deformation means 40 Roller section 50 Straight-line type (elastic straight-line type part) 51 One side 52 Other side W work W1 One side of the work W2 Other side of work α Normal state β Curved state

Claims

1. A bending apparatus for bending a workpiece having an elongated shape with an axis extending in a longitudinal direction being linear, in a predetermined direction to obtain a bent product, comprising: A base portion; A curved mold part is disposed on the base part, and has a curved molding surface formed thereon, the curved molding surface being pressed against one side of the workpiece while both ends of the workpiece are free ends, thereby curving the workpiece in the predetermined direction; An elastic plate portion having a long, elastically deformable band shape, which can be freely changed from a normal state where it is not elastically deformed to a curved state where it is elastically deformed and bent; an elastic linear mold part that is in contact with the other side surface of the workpiece and is elongated in a direction that coincides with the longitudinal direction of the workpiece and is elastically deformable; Equipped with In a state where the elastic linear mold part is in contact with the other side surface of the workpiece and one side surface of the workpiece is placed against the curved forming surface of the curved mold part, One side of the elastic plate portion, whose longitudinal direction coincides with that of the elastic linear mold portion in the normal state, is pressed against a side of the elastic linear mold portion opposite to the side on which the work is arranged, and is then transformed into the curved state, whereby the work is pressed against the elastic linear mold portion while being deformed along the curved forming surface, and the work is curved in the predetermined direction. A bending apparatus characterized by the above.

2. a roller portion disposed on the opposite side of the curved shape forming surface of the curved shape mold portion with respect to the elastic plate portion; The roller portion is The elastic plate portion is pressed against the elastic plate portion that has been transformed into the curved state, and the elastic plate portion is rolled on the other side surface of the elastic plate portion along the longitudinal direction of the elastic plate portion. The bending apparatus according to claim 1 .

3. A bending method for obtaining a bent product by bending a workpiece having an elongated shape and an axis extending in a longitudinal direction that is linear, in a predetermined direction, comprising the steps of: a preparation step of placing the work so that one side of the work faces a curved mold section having a curved molding surface formed thereon, the curved mold section being pressed against one side of the work with both ends of the work being free, thereby placing the one side of the work against the curved molding surface, and contacting the other side of the work with an elastic linear mold section that is elongated in a direction that coincides with the longitudinal direction of the work and is elastically deformable; a bending process step in which, after the preparation process, an elastic plate section having a long, elastically deformable band shape and capable of being freely converted from a normal state in which it is not elastically deformed to a curved state in which it is curved so as to bend elastically by bending, is converted into the curved state while one side of the elastic plate section is pressed against a side of the elastic linear mold section opposite to the side on which the workpiece is arranged, with the longitudinal direction of the elastic plate section being aligned with the longitudinal direction of the elastic linear mold section in the normal state, thereby deforming the workpiece together with the elastic linear mold section so as to follow the curved shape forming surface and pressing the workpiece against the curved shape forming surface, thereby bending the workpiece in the predetermined direction; A bending method comprising the steps of:

4. The method further includes a copying step of pressing a roller portion arranged on the opposite side of the curved shape forming surface of the curved mold portion with respect to the elastic plate portion against the elastic plate portion that has been converted into the curved state, and rolling the roller portion on the other side of the elastic plate portion along the longitudinal direction of the elastic plate portion to copy the workpiece along the curved shape forming surface. The bending method according to claim 3.

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