JP2004141927A - Bending method and bender - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bender which requires no die in bending, performs the bending ranging from a relatively small radius of curvature to a relatively large radius of curvature, can easily loads the axial tension force, and is easy to use a core member. <P>SOLUTION: The bender comprises an arm 2 which supports the tip portion of a workpiece W and pulls the workpiece W by turning around a predetermined rotary shaft 2a, a plurality of working rolls 10, 11, and 21-23 to give bending deformation to the workpiece W to be moved by the turning of the arm 2, a plurality of winding rolls 30 which are moved by the turning of the arm 2 to guide and support the workpiece W after passing through the plurality of working rolls 10, 11, and 21-23 along the predetermined locus, and friction members 51 and 52 as a resistance providing means to apply the resistance force to the workpiece W pulled by the arm 2 and load the axial tension force to the workpiece W passing through the plurality of working rolls 10, 11, and 21-23. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus for bending various shapes, bars, plates, and the like, for example.
[0002]
[Prior art]
As the bending machine, for example, a rod or a shape material such as a rotary drawing bending machine, a rotary press bending machine or an axial tension load rotary drawing bending machine, which is suitable for bending a relatively small radius of curvature, Roll bending machines suitable for bending having a relatively large radius of curvature are known (for example, see Patent Documents 1 to 4).
The rotary pulling bending machine and the rotary press bending machine have the same principle of bending, but are used properly depending on the shape of the product. The radius of curvature of the bending in the rotary drawing bending machine and the rotary press bending machine is about 1 to 20 times the height of the material, and the bending is often relatively small. Therefore, when the thickness of the material is thin, wrinkle deformation due to buckling is likely to occur inside the bend, that is, on the compression side. In order to prevent the generation of wrinkles, it is effective to perform rotary drawing bending processing with axial tension applied.
The roll bending machine sandwiches a material between a plurality of rolls and drives the rolls to bend the material into a uniform arc while feeding the material in a certain direction. In this roll bending machine, the radius of curvature can be defined by adjusting the positional relationship between a plurality of rolls. Therefore, since a die having a specific bending radius is not required, the cost for operating the processing machine is reduced.
The bending method includes a wide variety of methods such as press bending and heating bending in addition to the above-described processing methods.
[0003]
[Patent Document 1]
JP-A-4-258318 [Patent Document 2]
JP-A-11-28522 [Patent Document 3]
JP-A-11-003895 [Patent Document 4]
JP-A-11-267765
[Problems to be solved by the invention]
By the way, it is known that the bending radius of the product becomes larger in the rotary drawing bending machine and the rotary press bending machine than in the bending radius due to the characteristics of the bending process. This phenomenon is called springback and is one of the causes of difficulty in bending. The degree of springback depends on the degree of bending, the shape of the material and the material properties. Therefore, it is necessary to optimize the bending radius at the time of processing according to the processing conditions, and thus it is necessary to prepare dies (forms) having a large number of curvatures in advance.
On the other hand, since the roll bending machine can regulate the bending curvature in accordance with the positional relationship between a plurality of rolls, it is not necessary to prepare a die having a specific bending radius. There is a disadvantage that it is difficult to make smaller.
[0005]
The present invention has been made in view of the above-described problems, and has an object of not requiring a die for bending, and hardly causing wrinkle deformation on a compression side of a thin processing material, and Another object of the present invention is to provide a bending apparatus and a bending method capable of handling a bending process from a relatively small radius of curvature to a relatively large radius of curvature.
[0006]
[Means for Solving the Problems]
The bending apparatus according to the present invention includes a pulling means for pulling a long processing material along a predetermined trajectory, and a plurality of bending means which are arranged in a predetermined positional relationship and apply bending deformation to the processing material moved by the pulling means. And a shaft tensile force loading means for applying an axial tensile force in a longitudinal direction of the working material passing through the plurality of working rolls.
[0007]
Further, the bending apparatus of the present invention is arranged in a predetermined positional relationship with an arm that supports a part of a long processing material and pulls the processing material by turning around a predetermined rotation axis. A plurality of processing rolls that apply bending deformation to the processing material moved by the rotation of the arm; and a predetermined locus that moves by the rotation of the arm and passes through the plurality of processing rolls. And a plurality of take-up rolls for guiding and supporting along.
[0008]
Preferably, the apparatus further includes resistance applying means for applying a resistance to the working material pulled by the arm and applying an axial tensile force to the working material passing through the plurality of working rolls.
[0009]
More preferably, the plurality of processing rolls are at least one processing radius roll arranged on a circumference of a predetermined radius, and a first roll that gives bending deformation to the processing material in cooperation with the processing radius roll. And a second bending load roll.
More preferably, the plurality of winding rolls are circles having the rotation axis as a center and having a radius substantially equal to a radius of curvature of the processing material after springback occurs after passing through the plurality of processing rolls. It is arranged on the circumference.
[0010]
In the bending method of the present invention, a long processing material is passed along a plurality of processing rolls while being stretched along a predetermined trajectory to give a bending deformation having a predetermined curvature.
[0011]
Preferably, the material for processing is guided while guiding the material for processing along a circumference having a radius substantially equal to the radius of curvature of the material for processing after passing between the plurality of processing rolls and causing springback. Pull the material.
[0012]
More preferably, the material for processing is pulled while applying an axial tensile force in the longitudinal direction.
More preferably, the axial tension is applied by applying a resistance to the working material before passing between the plurality of working rolls.
More preferably, a hollow material is used as the material for processing, and bending deformation is applied in a state where a core material is inserted into the material for processing.
[0013]
In the present invention, a long work material is pulled along a predetermined trajectory and is passed between a plurality of work rolls, thereby giving bending deformation to the work material. At this time, by applying an axial tensile force to the working material passing between the working rolls, even when performing a bending work with a relatively small curvature, the seat is located inside the bending of the working material, that is, on the compression side. Wrinkling deformation due to bending can be prevented, and bending with a relatively small curvature to bending with a relatively large curvature can be performed.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view showing a schematic structure of a bending apparatus according to one embodiment of the present invention.
In FIG. 1, a bending apparatus 1 includes an arm 2, a plurality of processing radius rolls 21, 22, 23, first and second bending load rolls 10, 11, a plurality of winding rolls 30, and a guide roll. 40 and friction members 51 and 52. The plurality of processing radius rolls 21, 22, 23 and the first and second bending load rolls 10, 11 are one embodiment of the processing roll of the present invention, and the friction members 51, 52 are the resistance of the present invention. It is one embodiment of an application means.
The bending apparatus 1 bends the raw material W for processing. As the working material W, various shapes such as a long shape, for example, a shape obtained by extruding a metal material such as an aluminum alloy, a flat material, and an airfoil cross section material are used. Examples of the shape include a hollow “b-shaped”, a “co-shaped”, and a “hollow round bar” having a rectangular cross section and a hollow shape.
[0015]
The arm 2 is supported by a base (not shown) so as to be pivotable about the rotation shaft 2a. The distal end of the arm 2 has a support portion 2b for supporting the material W for processing. The support portion 2b supports a part of the processing material W, for example, a tip portion.
Specifically, the support portion 2b is formed of a pin-shaped member, and the pin-shaped member is inserted into a through hole formed at a distal end of the processing material W. Thereby, the tip end of the processing material W is rotatably supported. In addition, the support part 2b should just be a structure which can support the front-end | tip part of the raw material W for processings, such as a clamp mechanism.
The rotation shaft 2a of the arm 2 is rotated by a driving device (not shown). The driving device includes, for example, an electric motor, a transmission mechanism that transmits the rotational force of the electric motor to the rotating shaft 2a, and the like.
[0016]
The processing radius rolls 21, 22, 23, the first and second bending load rolls 10, 11, the plurality of winding rolls 30, and the guide rolls 40 are rotatably supported on a base (not shown). These rolls are arranged on the same plane.
[0017]
Machining radius rolls 21, 22 are arranged on the circumference _{C 2} having the predetermined radius. The processing radius rolls 21, 22, and 23 are rolls for supporting the material W for processing on the outer peripheral surface and giving a bending curvature when bending the material W for processing.
[0018]
The first and second bending load rolls 10 and 11 support the processing material W on the outer peripheral surface, and apply bending deformation to the processing material W in cooperation with the processing radius rolls 21, 22 and 23. That is, the first and second bending load rolls 10 and 11 apply a bending moment to the material W for processing sandwiched between the first and second bending load rolls 10 and 11 and the processing radius rolls 21, 22 and 23. give. This bending moment is determined according to the relative positional relationship between the load rolls 10, 11 and the processing radius rolls 21, 22, 23.
[0019]
Winding roll 30 has about a rotation axis 2a, are arrayed on the circumference C ₁ of a given radius.
The winding roll 30 removes the processing material W in a state where springback occurs in the processing material W that has been subjected to bending deformation by passing through the bending load rolls 10 and 11 and the processing radius rolls 21, 22 and 23. Guide support. That is, the processing material W is guided and supported along a predetermined trajectory composed of a circumference in contact with the outer periphery of the winding roll 30. The radius of the circumference in contact with the outer periphery of the winding roll 30 is substantially equal to the radius of curvature of the working material W in which springback has occurred after bending deformation.
Incidentally, the circumference _{C 1} has a larger radius than the circumference _{C 2} described above, also, the circumference _{C 2} in the circumferential _{C 1} is inscribed.
[0020]
The guide roll 40 defines a position through which the processing material W passes before reaching the processing radius rolls 21, 22 and 23 and the first and second bending load rolls 10 and 11.
[0021]
The friction members 51 and 52 sandwich the working material W from both sides and are pressed against the working material W with a predetermined force F by a pressing device (not shown). When the friction members 51 and 52 are pressed against the processing material W with a predetermined force F, the friction members 51 and 52 generate a friction force in a direction that hinders the movement of the processing material W. By applying a frictional force to the material W for processing by the friction members 51 and 52, an axial tensile force in the longitudinal direction is applied to the material W for processing.
[0022]
In FIG. 1, a core material 60 is used when it is desired to prevent flat deformation from occurring during bending of a hollow processing material W. The flat deformation is a deformation in which the cross-sectional shape of the working material W is broken. A core material 60 conforming to the shape of the processing material W is prepared as appropriate, and bending is performed in a state where the core material 60 is inserted into the processing material W.
[0023]
Next, an example of a bending method using the bending apparatus having the above configuration will be described.
First, the friction members 51 and 52 are pressed against the workpiece W with a desired force F from the state shown in FIG. In order to prevent flat deformation of the processing material W, the core material 60 is inserted into the processing material W in advance.
[0024]
From this state, as shown in FIG. 2, the arm 2 is turned in the direction of arrow R1. By turning the arm 2 in the direction of the arrow R1, the processing material W is pulled against the resistance force acting from the friction members 51, 52, and the processing radius rolls 21, 22, 23 and the first and second processing radius rolls. Between the bending load rolls 10 and 11. Thereby, bending deformation is given to the processing material W.
[0025]
Specifically, as shown in FIG. 2, the workpiece W is subjected to bending deformation with a curvature radius equal to the radius RB of the circumference C ₂ a in which the outer circumferences of the processing radius rolls 21, 22, and 23 are inscribed.
That is, the processing material W is wound around a rotary drum having a radius RB and is subjected to rotary drawing and bending, similarly to the processing radius rolls 21, 22 and 23 and the first and second bending load rolls 10 and 11. Is bent.
[0026]
Here, FIG. 3 is a detailed view of a bending area in the bending apparatus 1.
The processing material W is pulled by the arm 2 and receives a resistance force from the friction members 51 and 52. Therefore, as shown in FIG. 22 and 23 and between the first and second bending load rolls 10 and 11.
At this time, the work material W receives mainly the forces Pa to Pd from the first and second bending load rolls 10 and 11 and the work radius rolls 21 and 22, and the work material W is processed by these forces Pa to Pd. The bending moment acts on.
Note that the processing radius roll 23 is a reference when end bending is applied to the processing material W in advance at the time of starting bending, and almost no force acts on the processing material W from the processing radius roll 23.
[0027]
Since the material for processing W is bent in a state where a desired axial tensile force K is applied, it is possible to suppress the compression strain on the inner side of the bending of the material for processing W, that is, on the compression side.
[0028]
As shown in FIG. 3, when the working material W passes between the working radius roll 23 and the second bending load roll 11, the work W is released from the action of these working rolls, and springback occurs. As a result, the processing material W changes to a radius R _Wa larger than the radius R _WB .
The radius R _Wa, as shown in FIG. 2, is substantially equal to the radius Ra of the circumference C _{1 a} of the outer periphery of the plurality of the winding roll 30 is in contact.
Accordingly, the processing material W having undergone springback is pulled by the arm 2 while being guided and supported by the winding roll 30 along the circumference C ₁ a in a substantially final product shape.
When the arm 2 turns by a predetermined angle, the bending of the processing material W is completed.
[0029]
In the present embodiment, the work material W is sent by pulling the tip of the work material W by turning the arm 2 instead of sending out the work material W by driving a roll as in a conventional roll bending machine. .
For this reason, by applying a constant resistance (frictional force) to the material W for processing by the friction members 51 and 52, it is possible to cause the axial tension force to act on the material W for processing stably. Similarly, it is very easy to apply the core material 60 to the material W for processing.
[0030]
In the present embodiment, since any axial tensile force can be stably applied to the material W for processing, the inside of the bending, that is, the compression strain on the compression side can be suppressed, and wrinkling deformation due to buckling can be suppressed. Generation can be suppressed.
As a result, it is possible to bend a material that is likely to generate wrinkles, such as a hollow thin profile. Also, since wrinkling deformation due to buckling can be suppressed, processing with a relatively small bending curvature can be performed.
[0031]
In the present embodiment, since the application of the core material 60 to the processing material W becomes very easy, the occurrence of the flat deformation of the processing material W is reliably prevented by appropriately selecting the core material 60 according to the processing conditions. can do.
[0032]
In the present embodiment, the arrangement of the processing radius rolls 21, 22, 23, the first and second bending load rolls 10, 11, and the winding roll 30 can be arbitrarily and easily changed. Can be easily changed by appropriately adjusting the arrangement of these rolls.
[0033]
In this embodiment, the case where the processing radius rolls 21, 22, 23 and the first and second bending load rolls 10, 11 are used as the processing rolls has been described, but the present invention is not limited to this. . The minimum rolls required for bending the material W for processing are a first bending load roll 10, a second bending load roll 11, and a processing radius roll 21 or 22. Optionally, rolls can be added.
Further, in the present embodiment, the case where the arm 2 is used as the pulling means for pulling the material W for processing along a predetermined trajectory has been exemplified. However, even if another driving mechanism is used without using the arm 2, It is possible to pull the material W along a predetermined trajectory.
Further, when it is not necessary to suppress wrinkle deformation due to buckling, it is not necessary to positively apply an axial tensile force. In this case, the frictional force received from the roll acts as an axial pulling force.
[0034]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, a die is not required for bending, and it can respond to bending from a comparatively small radius of curvature to a comparatively large radius of curvature.
Further, according to the present invention, it is possible to prevent wrinkle deformation from occurring on the compression side when a thin hollow processing material is bent.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a schematic structure of a bending apparatus according to an embodiment of the present invention.
FIG. 2 is a sectional view showing an operation state of the bending device.
FIG. 3 is a detailed view of a bending area in the bending apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Bending apparatus 2 ... Arm 10 ... First bending load roll 11 ... Second bending load rolls 21, 22, 23 ... Processing radius roll 30 ... Winding roll 40 ... Guide rolls 51 and 52 ... Friction member W ... Material for processing 60: Heartwood

Claims (10)

Tensile means for pulling a long working material along a predetermined trajectory,
A plurality of processing rolls arranged in a predetermined positional relationship and applying bending deformation to the processing material moved by the pulling means,
A bending tension applying device for applying axial tension in a longitudinal direction of the processing material passing through the plurality of processing rolls. An arm that supports a part of the long processing material and pulls the processing material by pivoting around a predetermined rotation axis,
A plurality of processing rolls arranged in a predetermined positional relationship and giving bending deformation to the processing material moved by the rotation of the arm,
A bending apparatus comprising: a plurality of winding rolls that are moved by the rotation of the arm and guide and support the processing material after passing through the plurality of processing rolls along a predetermined trajectory. 3. The bending apparatus according to claim 2, further comprising a resistance applying unit configured to apply a resistance to the working material pulled by the arm and apply an axial tensile force to the working material passing through the plurality of working rolls. 4. . The plurality of processing rolls, at least one processing radius roll disposed on the circumference of a predetermined radius,
4. The bending apparatus according to claim 2, further comprising first and second bending load rolls that perform bending deformation on the material for processing in cooperation with the processing radius roll. 5. The plurality of winding rolls are arranged on a circumference having a radius substantially equal to the radius of curvature of the processing material after springback has occurred after passing through the plurality of processing rolls, having the rotation axis as a center. The bending apparatus according to any one of claims 2 to 4, wherein: A bending method in which a long processing material is passed along a plurality of processing rolls while being stretched along a predetermined trajectory to provide a bending deformation having a predetermined curvature. Claims: Pulling the working material while guiding the working material along a circumference having a radius substantially equal to the radius of curvature of the working material after passing between the plurality of working rolls and causing springback. Item 7. A bending method according to Item 6. The bending method according to claim 6 or 7, wherein the material for processing is pulled while applying an axial tensile force in a longitudinal direction. 9. The bending method according to claim 8, wherein a resistance is applied to the working material before passing between the plurality of working rolls to apply the axial tensile force. Using a hollow material for the material for processing,
The bending method according to any one of claims 6 to 9, wherein bending is performed in a state where a core material is inserted into the processing material.

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