JPH08112623A - Shape bending method and three-dimensional bending member obtained with above - Google Patents

Abstract

PURPOSE: To provide a shape bending method and a three-dimensional bending member with this bending method which can bend the shape in the three- dimension by only moving a bending roll without generating wrinkles on the internal side part in bending of even a small radius of curvature. CONSTITUTION: Two bending rolls 11, 21 are arranged at different positions on the axial direction of a shape W, grooves 11b, 21b of the shape to be obtained in bending are pre-installed on the front face of these bending rolls, one side or both of the bending rolls is moved parallel, and by parallel moving both side bending rolls relatively, the plastic deformation of the shearing deformation along the groove as the main is generated on the shapes. This bending method is more effective to bend while applying the internal pressure and/or the compression force to the axial direction. Then, the three-dimensional bent member is obtained with this method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending method for three-dimensionally bending a shaped material, particularly an aluminum alloy extruded shaped material, and a three-dimensionally bent member obtained by this method.

[0002]

2. Description of the Related Art Extruded aluminum alloy materials used for automobile frame materials, building materials, ships, etc. are used after being three-dimensionally bent vertically and horizontally with respect to the axis of the aluminum alloy extruded shape materials in order to meet the application. May need to be done. The three-dimensional bending process according to the present invention means a straight shape having a width W and a height H, as shown in the example of the extruded profile having a rectangular cross section in (a), (b) and (c) of FIG. The material is bent with a curvature of R ₁ and R ₂ over a range of a processing area C _{1 when} viewed in the vertical direction A, and by this bending, a displacement difference D ₁ between the centers of the shape members.
In addition to the above, it means that bending is performed with a curvature of R ₃ and R ₄ over the range of the processing area C _{2 when} viewed in the horizontal direction B, and this bending causes a displacement difference D ₂ between the centers of the shape members. To do.

In order to perform a three-dimensional bending process on a work as a shape member, it is general to use a bending process apparatus including a fixed mold and a movable gyro mold, which is so-called push-through bending (multi-bender). is there. That is, this is a method of imparting three-dimensional bending to a work that is forcibly pressed and moved through work insertion holes provided in the fixed mold and the gyro mold, with the fixed mold, in particular, the outlet side portion as a fulcrum. .

[0004] In some cases, tensile pressing bending (draw bender), which is a method applying tensile bending, is used.

[0005]

The above-mentioned three-dimensional bending work by the multi-bender is effective for a bent shape member having a relatively large radius of curvature, but as the radius of curvature becomes smaller, the inner part of the bending work becomes smaller. There is a problem that'wrinkles' tend to get closer to the side and buckling occurs, which is not suitable for three-dimensional bending with a small curvature. Further, in the case of the draw bender, it is necessary to perform the bending of FIGS. 12B and 12C in two steps, and if minute defects such as'wrinkles' occur in the first step, It will break from there in the process, and again, it is not suitable for three-dimensional bending with a small curvature. Furthermore, the conventional three-dimensional bending method has problems that the bending equipment becomes large-scale and the processing time is relatively long.

The present invention solves the above-mentioned problems in the prior art, and enables the three-dimensional bending process to be performed on the profile only by moving the bending roll, and the bending process with a small radius of curvature can be performed. It is an object of the present invention to provide a method for bending a profile without causing'wrinkles' in the inner portion of the bending process and a three-dimensional bending member obtained by this method.

[0007]

In order to achieve the above object, the present invention relates to a shape to be bent when three-dimensionally bending a shape in a direction vertical and a horizontal direction with respect to its axis. Two bending rolls are arranged at different positions in the axial direction of the material, and a groove having a shape to be obtained by bending is provided on the surface of the bending roll in advance. Alternatively, both of them are moved in parallel, and both of the bending rolls are moved in parallel relative to each other in two axial directions, thereby causing the shape to undergo plastic deformation mainly due to shear deformation along the groove. The bending method of the profile is defined as follows. This bending method includes
Bending may be performed while applying an internal pressure and / or a compressive force in the axial direction to the shape member. And it constituted as a three-dimensional bending member obtained by this method.

Further, when three-dimensionally bending the shape in the vertical and horizontal directions with respect to its axis, a pair of bending rolls are arranged at the same position in the axis of the shape to be bent. The groove of the shape to be obtained by bending is provided in advance on the surface of this bending roll, and the other bending roll is revolved while rotating the other bending roll with respect to one bending roll, and then The profile bent by the other bending roll is pressed toward the groove formed in the other bending roll, so that the profile is mainly subjected to shear deformation along the groove. A bending method of the profile is constructed which is characterized by causing the plastic deformation. The pressing of the profile toward the groove formed in the other bending roll may be performed by causing one bending roll to revolve around the other bending roll. And it constituted as a three-dimensional bending member obtained by this method.

[0009]

[Function] When the former shape bending method is used, the shape is
It is held in the groove of the bending roll at different positions in the axial direction, and the three-dimensional bending process is performed by the relative parallel movement of the bending rolls in the two axial directions. Also,
According to the latter method of bending the profile, the profile is formed on the other bending roll after the other bending roll revolves along the groove of the one bending roll. Three-dimensional bending is performed by pressing the profile toward the formed groove or revolving the one bending roll while rotating the other bending roll.

[0010]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a front view of an apparatus for manufacturing a three-dimensional bending member by the method of the first embodiment of the present invention, and FIG.
FIG. 3 is a plan view of the receiving die in FIG. 1 as viewed in the direction of arrow C, and FIG.
FIG. 3 is a front view showing a state in which three-dimensional bending is performed by the device of FIG. 4 (a) and 4 (b) are perspective views of one and the other bending rolls constituting the apparatus of FIG.

In this embodiment, as shown in FIG. 1, a fixed die 1 and a movable die 2 are arranged adjacent to each other in the axial direction of a profile w made of a rectangular tube made of aluminum or aluminum alloy.
And are arranged. The fixed die 1 is a bending roll 11
The movable die 2 and the fixed die 1 are arranged so that the movable die 2 and the fixed die 1 have a symmetrical positional relationship with each other. 22 and 22.

Bending roll 11 constituting the fixed die 1.
And the bending roll 21 that constitutes the movable die 2 are respectively tail portions 11a and 2 so as to extend in the axial direction of the profile w.
1a is formed, and as shown in FIGS. 4A and 4B, curvatures R ₁ and R ₂ (FIG. 1) are formed on the surfaces of the bending rolls 11 and 21 including the tail portions 11a and 21a, respectively. ) Grooves 11b and 21b are provided. This groove 11b,
21b is formed in a straight shape from the tails 11a, 21a of the respective bending rolls 11, 21 to the midway region, but thereafter, in the axial direction of the bending rolls 11, 21 over the roll surface side. It is formed by bending so as to shift. That is, the grooves have curvatures R ₃ and R ₄ along the shape to be obtained by bending in advance.

Also in the angular receiving dies 12 and 22 forming a pair with the bending rolls 11 and 21, respectively, the groove 1 is formed on the contact surface.
2b, 22b are formed, but the bending roll 11,
After the midway region where the grooves 11b, 21b of 21 start to be curved so as to be displaced in the axial direction of the roll, a wall is formed only on one side and the other side is formed so as not to hinder the bending process. Free notch 12c (see FIG. 2), 2
2c.

As shown in FIG. 1, seal caps 4 and 4 are provided at both ends of the profile w to be bent.
An internal pressure P due to a fluid (water, oil, etc.) is applied from the inside of the profile w by a known means. A compressive force F is applied to both ends of the seal caps 4, 4. When the radius of curvature of the profile to be bent is large, a tensile force F ′ may be applied instead of the above internal pressure P and compression force F.

In performing the three-dimensional bending process by the above-mentioned apparatus, first, the shape member is formed between the upper and lower grooves 11b and 21b and the grooves 12b and 22b formed in the fixed mold 1 and the movable mold 2. The w is held by the forces of f ₁ and f ₂ , and the seal caps 4 and 4 are arranged at both ends thereof. A compressive force is applied to both ends of the seal caps 4 and 4 to seal between the cap and the profile w. f ₁ ,
Even if the holding force of f ₂ is applied, the profile w can be slid with respect to at least one of the fixed mold 1 and the movable mold 2 in the axial direction of the grooves 11b, 12b, 21.
b and 22b are formed. First, while exhausting from the exhaust port 4a of the left side cap, a fluid (for example, water containing an anticorrosive agent) is injected from the right side cap to fill the inside of the profile w, and the exhaust port 4a
Block a. Next, while gradually increasing the working internal pressure to the fluid and applying a predetermined working internal pressure P, the movable die 2 is moved in parallel with the fixed die 1 in the two YZ directions. A known hydraulic mechanism or the like is used to operate the movable die 2. In this case, the parallel movement in the YZ direction in the two axial directions is synchronized with the amount of movement in the vertical direction (Y ₁ direction) during bending, and is synchronized with the axial direction of the bending roll (Z direction, in FIG. 1). Indicates a direction along the grooves 11b and 21b provided in a shape to be obtained by bending on the surfaces of the upper and lower bending rolls 11 and 21 in advance by combining movements in the vertical direction).

As a result, the shape w undergoes plastic deformation mainly due to shear deformation along the grooves 11b and 21b of the upper and lower bending rolls 11 and 21. In this case, the profile w
Since most of them are held by the upper and lower mold grooves, they can be bent into a predetermined shape without any deformation other than bending.

That is, by moving the movable die 2 parallel to the fixed die 1 in the biaxial direction, the upper and lower bending rolls 1 shown in FIG. 3 and FIG.
At the same time as the bending of the curvatures R ₁ and R ₂ caused by the arcs of 1 and 21 is performed, the shapes of the grooves 11b and 21b of the upper and lower bending rolls 11 and 21 as shown in FIG. Bending of curvatures R ₃ and R ₄ along it is performed. As a result, the three-dimensional bending member shown in FIG. 12A can be obtained.

During bending, the internal pressure P is applied to the profile w.
Further, if a compressive force F is applied in the axial direction of the profile w, there is no risk of'wrinkling 'occurring in the inner portion of the bent portion, and the thickness of the outer portion of the bent portion may become thin. Absent. When the radius of curvature of the profile to be bent is large, the same effect can be obtained by applying the tensile force F ′ instead of the internal pressure P and the compressive force F.

In the above embodiment, the movable die 2 is moved with respect to the fixed die 1. However, the arrangement may be reversed, and both the movable die 2 and the movable die 2 are relatively movable.
You may make it perform the parallel movement of an axial direction.

FIGS. 5, 6 and 7 show a second embodiment of the present invention.
It is a front view of the apparatus which manufactures a three-dimensional bending member by the method of an Example. In this embodiment, a fixed bending roll 11 and a movable bending roll 21 are arranged at the same position in the axial direction of the profile w. The bending rolls 11 and 21 have the same structure as shown in FIGS. 4A and 4B, and one bending roll 11 is provided.
Has a tail 11a formed so as to extend in the axial direction of the profile w, and the other bending roll 21 has a tail 21a extending in a predetermined direction with respect to the axial direction of the profile w.
Are formed. The bending rolls 11 and 21 including the tail portions 11a and 21a have curvatures R ₁ and
R ₂ grooves 11b and 21b are provided. This groove 11b,
21b is formed in a straight shape from the tails 11a, 21a of the respective bending rolls 11, 21 to the midway region, but thereafter, in the axial direction of the bending rolls 11, 21 over the roll surface side. It is formed by bending so as to shift. In addition, 11x is a presser type.

Three-dimensional bending is performed by the above-mentioned device.
First, as shown in FIG. 5, a fixed type is constructed.
Bending for forming a movable roll and bending roll 11
Of the upper and lower grooves 11b, 21b formed in the roll 21 for
In between, the profile w is held and one end of the profile is fixed (I).
Further, the lower end of the profile w is pressed by the pressing die 11x. Soshi
Around the upper bending roll 11 and lower bending
The roll 21 for revolution revolves (E) while revolving (E). This
As a result, the profile w is sequentially sheared and deformed, as shown in FIG.
Curvature caused by the arc of the above bending roll 11
R₁, R₃Is bent. Profile w in this state
The other end of the curvature R has a curvature R shown in FIG. ₃In the direction of
Therefore, it is located at an angle in the front direction of FIG.
Therefore, the other end of the profile w is bent at the bottom for bending.
The oil (not shown) toward the groove 21b of the straight portion of the roll 21.
Forcibly bend by pressing as shown by arrow H with a pressure cylinder etc.
Processing. As a result, the three-dimensional song shown in FIG.
A barb member can be obtained.

FIG. 8, FIG. 9 and FIG. 10 are front views of an apparatus for manufacturing a three-dimensional bending member by the method of the third embodiment of the present invention. The upper end of the bending roll 11 is used to press the end portion in the three-dimensional direction. In this example, movable bending rolls 11 and 21 are arranged facing each other at the same position in the axial direction of the profile w. The lower bending roll 21 has the same structure as in the second embodiment. As shown in FIGS. 8 to 11, the upper bending roll 11 has tail portions 11a and 11a formed so as to extend in the axial direction of the profile w and a direction having a predetermined angle with respect to the axial direction, and the groove 11 11b is formed in a straight shape from both tails 11a, 11a of the bending roll 11 to an intermediate region, but thereafter, it is displaced in the axial direction of the bending rolls 11 and 21 over the roll surface side. Curvature R ₃ and R ₄
Is formed.

When performing three-dimensional bending by the above-described apparatus, first, as shown in FIG. 8, the upper and lower bending rolls 11 and 21 are formed on the upper bending roll 11 and the lower bending roll 21, respectively. The profile w is held between the grooves 11b and 21b, and one end of the profile is fixed (I). Then, the lower bending roll 21 revolves around the upper bending roll 11 while revolving (E) while revolving (G). As a result, the profile w
Are sequentially subjected to shear deformation, and are subjected to bending with curvatures R ₁ and R ₃ provided by the arc of the upper bending roll 11 as shown in FIG. Then, from this state, the upper bending roll 11 is revolved (G) while rotating (E) around the lower bending roll 21. The other end of the shape member w is pressed in the three-dimensional direction along the groove 21b of the lower bending roll 21 to be forcibly bent. As a result,
The three-dimensional bending member shown in FIG. 12 (a) can be obtained.

[0024]

As described above, according to the present invention, the following effects can be obtained. In the first embodiment of the present invention, one of the two bending rolls arranged at different positions in the axial direction of the profile is translated in the biaxial direction, or both are simply translated in the uniaxial direction. Then, the three-dimensional bending member can be obtained only by relatively moving in parallel in the biaxial directions, the bending processing equipment is smaller than the conventional apparatus, and the processing time is short. Then, apply internal pressure to the profile,
Also, since bending can be performed while applying a compressive force in the axial direction of the shape, even with bending members with a small radius of curvature, there will be no wrinkles on the inside of the bending, and there will be no outside of the bending. The thickness of the part does not become thin.

Further, in the second embodiment of the present invention, the profile members held on the upper and lower bending rolls are subjected to the rotation / revolution of one roll and the three-dimensional pressing of the end portions of the profile members. Since a three-dimensional bending member can be obtained, and in the third embodiment, this can be obtained only by rotation and revolution of both rolls, the bending equipment can be smaller than the conventional apparatus. Also, the processing time is short.

[Brief description of drawings]

FIG. 1 is a front view of an apparatus for manufacturing a three-dimensional bending member according to the method of the first embodiment of the present invention.

FIG. 2 is a plan view of the receiving die shown in FIG.

FIG. 3 is a front view showing a state where three-dimensional bending processing is performed by the apparatus of FIG.

4 (a) and 4 (b) are perspective views of one and the other bending rolls constituting the device of the first embodiment.

FIG. 5 is a front view of an apparatus for manufacturing a three-dimensional bending member by the method of the second embodiment of the present invention.

FIG. 6 is a front view of an apparatus for manufacturing a three-dimensional bending member by the method of the second embodiment of the present invention.

FIG. 7 is a front view of an apparatus for manufacturing a three-dimensional bending member according to the method of the second embodiment of the present invention.

FIG. 8 is a front view of an apparatus for manufacturing a three-dimensional bending member by the method of the third embodiment of the present invention.

FIG. 9 is a front view of an apparatus for manufacturing a three-dimensional bending member by the method of the third embodiment of the present invention.

FIG. 10 is a front view of an apparatus for manufacturing a three-dimensional bending member by the method of the third embodiment of the present invention.

FIG. 11 is a perspective view of a bending roll that constitutes an apparatus according to a third embodiment of the present invention.

FIG. 12 (a) is a perspective view of a three-dimensional bending member obtained by the method of the present invention, FIG. 12 (b) is a view on arrow A of the same figure, and FIG.
Is a view on arrow B of FIG.

[Explanation of symbols]

 1 ... Fixed type 2 ... Movable type 11 ... Bending roll 11a ... Tail 11b ... Groove 12 ... Receiving die 12b ... Groove 21 ... Bending roll 21a ... Tail 21b ... Groove 22 ... Receiving die 22b ... Groove w ... Profile

Front page continued (72) Inventor Takashi Sasamoto 1-34-1 Kambara, Kambara-cho, Anbara-gun, Shizuoka

Claims (8)

[Claims] 1. When three-dimensionally bending a shape in a direction vertical and horizontal with respect to the axis of the shape, two bending rolls are arranged at different positions in the direction of the axis of the shape to be bent. Then, a groove having a shape to be obtained by bending is provided in advance on the surface of the bending roll, and one or both of the bending rolls are moved in parallel, and both bending rolls are relatively moved. A method for bending a profile, which comprises causing the profile to undergo plastic deformation mainly due to shear deformation along the groove by parallel translation in two axial directions. 2. The method for bending a shape member according to claim 1, wherein bending is performed while applying an internal pressure to the shape member. 3. The method for bending a profile according to claim 1, wherein the bending is performed while applying a compressive force in the axial direction of the profile. 4. The method for bending a profile according to claim 1, wherein the bending is performed while applying a tensile force in the axial direction of the profile. 5. A three-dimensional bending member obtained by the method for bending a profile according to any one of claims 1 to 4. 6. A pair of bending rolls are arranged at the same position in the axial direction of the shape member to be bent when three-dimensionally bending the shape member in the vertical and horizontal directions with respect to the axis thereof. The groove of the shape to be obtained by bending is provided in advance on the surface of this bending roll, and the other bending roll is revolved while rotating the other bending roll with respect to one bending roll, and then The profile bent by the other bending roll is pressed toward the groove formed in the other bending roll, so that the profile is mainly subjected to shear deformation along the groove. A method for bending a profile, which is characterized by causing plastic deformation. 7. The pressing of the profile toward the groove formed in the other bending roll is revolved while the one bending roll is rotating with respect to the other bending roll. The method for bending a shape member according to claim 6, wherein 8. A three-dimensional bending member obtained by the method for bending a profile according to claim 6 or 7.