JP2002066642A - Bending apparatus and bending method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bending apparatus and method capable of bending a workpiece to a stable shape by uniformizing stress imposed on the workpiece. SOLUTION: A workpiece W is fixed by a clamp 3 provided with a bending die 2 formed in accordance with the bending shape of the workpiece W. A liner die 4 is arranged along the longitudinal direction of the workpiece. Subsequently the workpiece W passes through a bending roll 6 having a pair of rolls together with the bending die 2 and the linear die 4, and the workpiece W is bent along the lines of the bending die 2 by guiding the workpiece W with the linear die 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending apparatus and a bending method for bending a long member such as a bar, particularly an extruded member.

[0002]

2. Description of the Related Art When manufacturing frame members and bumper reinforcing materials for automobiles, or members for building structures or exterior members, a so-called bending process of bending a bar or the like is performed.

As an apparatus for performing such a bending process, for example, there has been an apparatus shown in FIG. The bending device 80 has an upper die 81 and a lower die 82 formed in accordance with the bending shape of the work W. A work W is placed between the upper die 81 and the lower die 82, pressure is applied to the upper die 81 from above, the upper die 81 is pressed down, and the work W is pressed and formed.

As another conventional bending apparatus, the present applicant discloses a bending apparatus disclosed in Japanese Utility Model Laid-Open No. 4-70210. As shown in FIG. 13, the bending apparatus 90 has a rotatable turntable 91, on which a bending guide 92 formed according to the bending shape of the work W is fixed. Have been. Further, a clamp 93 for fixing the work W is provided at the tip of the bending guide 92, and a pressing contact portion 94 for pressing the work W against the bending guide 92 is provided at a position slightly behind the clamp 93. . A pressing cylinder 95 for pressing the pressing contact portion 94 against the workpiece W is provided on a side of the pressing contact portion 94.

[0005] In this bending apparatus 90, the front end of the work W is fixed by a clamp 93 and a pressing cylinder 95 is fixed.
Thereby, the pressing contact portion 94 is pressed toward the work W, and the work W is pressed against the bending guide 92. By rotating the turntable 91 in this state, the work W is bent along the bending guide 92 so as to have a predetermined bending shape.

[0006]

However, in the conventional bending apparatus 80 shown in FIG. 12, when the work W is pressed by applying pressure to the upper die 81 from above, the center of the work W which comes into contact with the upper die 81 is pressed. Stress is concentrated on the part.
For this reason, there is a difference between the stress applied to the end of the work W in contact with the lower mold 82 and the stress applied to the central portion of the work W, and there is a problem that the bending shape is not stable.

On the other hand, a conventional bending apparatus 9 shown in FIG.
0, the bending guide 92 is fixed to the turntable 91.
One must rotate the whole. Therefore, a large driving force is required to rotate the turntable 91 to perform the bending. To change the bending shape of the work W, the bending guide must be accurately attached to the turntable 91. Therefore, the work for changing the bending shape of the work W is troublesome. Further, once the bending apparatus 90 is manufactured, even if the shape of the bending guide 92 is finely corrected, for example, it takes much time and effort.

Accordingly, an object of the present invention is to make it possible to bend a work into a stable shape by equalizing the stress applied to the work. It is another object of the present invention to be able to respond flexibly to, for example, a case where the bending shape of a workpiece is to be changed without requiring a large driving force when performing the bending process.

[0009]

Means for Solving the Problems The invention according to claim 1 of the present invention, which has solved the above-mentioned problems, has a bending die formed in accordance with a bending shape of a workpiece. Clamp means for fixing the tip of the workpiece is provided, and extends in the longitudinal direction of the workpiece, and guides the workpiece so that the workpiece is bent along the bending mold. A bending roll having a straight type, and having a pair of rolls for performing bending by passing the workpiece fixed by the clamping means together with the bending die and the linear type is provided. It is a bending apparatus. In the present specification, the term “bending mold formed according to the bending shape of the workpiece” refers to the purpose of allowing the workpiece to return by springback when the stress is removed after the completion of the bending. Means a bending mold formed so as to have a bending shape of the workpiece.

According to the first aspect of the present invention, the workpiece fixed by the clamping means provided at the tip of the bending die is passed between the bending rolls together with the bending die and the linear die for guiding the workpiece. And can be bent. For this reason, since a substantially same level of stress is applied to the workpiece when passing through the bending roll, it is possible to apply a substantially uniform stress to the workpiece. Further, the apparatus as a whole is simple, and when bending is performed, only a driving force required to pass the workpiece together with the bending die and the linear die is sufficient, so that a very small driving force can be achieved. Further, when it is desired to change the bending shape, it is only necessary to change the shape of the bending die. Therefore, it is possible to respond to the change promptly without any trouble. Moreover, even if the radius of the bent shape is large, the device does not become very large,
Further, even if the shape of the bending mold deviates from the design, the correction can be made simply. Further, when a bending mold and a straight mold are manufactured, one set of a straight mold that is divided into two is manufactured, and one of them may be bent into a product shape, so that the manufacture is extremely easy.

According to a second aspect of the present invention, the bending die includes:
A fitting groove into which the workpiece is fitted at the time of bending and after bending is formed, and the fitting groove has a shape surrounding the outer periphery of the workpiece by being combined with the linear type. The bending apparatus according to claim 1, wherein: In the invention according to claim 2, a fitting groove is formed in the bending mold so that a workpiece to be processed at the time of bending and after bending is fitted. For this reason, the workpiece after bending can be reliably held, and buckling deformation of the workpiece,
Since the occurrence of wrinkles is prevented, it is possible to contribute to the improvement of work efficiency.

The invention according to claim 3 is the bending apparatus according to claim 2, wherein a draft is formed in the fitting groove formed in the bending die. In the invention according to claim 3, a draft is formed in the fitting groove formed in the bending die. Therefore, the workpiece after the bending can be easily taken out from the bending mold.

According to a fourth aspect of the present invention, in the linear type,
A fitting groove for fitting the workpiece before processing is formed, and the fitting groove has a shape surrounding the outer periphery of the workpiece by being combined with the bending die. A bending apparatus according to any one of claims 1 to 3. In the invention according to claim 4, since the fitting groove into which the workpiece is fitted is formed in a linear shape, the workpiece is reliably guided when passing through the bending roll. Can be. Also, without forming the fitting groove in the bending mold, when the fitting groove is formed in a straight type, while the manufacture of the bending mold becomes easy,
The workpiece can be reliably held and combined with a straight type to perform bending in a shape surrounding the outer periphery of the workpiece. In addition, what formed the fitting groove in the straight type,
It can be manufactured relatively easily.

The invention according to claim 5 is the bending apparatus according to claim 4, wherein a draft is formed in the fitting groove formed in a straight line. In the invention according to claim 5, since the draft is formed in the fitting groove formed in the bending mold, the workpiece passing through the bending roll easily comes out of the fitting groove, and is bent from the straight type to the bending type. Can be reliably moved.

The invention according to claim 6 is characterized in that a liner member made of a low-friction resin is interposed in a portion of the bending die and the straight die that comes into contact with the workpiece. To any one of claims 5 to 5
It is a bending device described in the paragraph. In the invention according to claim 6, since the liner member made of the low-friction resin is interposed in the bending die and the linear die in the portion that comes into contact with the workpiece, the workpiece can be smoothly bent. . Also, by interposing a liner member,
Since the workpiece does not contact the mold, it is possible to prevent the occurrence of scratches or the like due to the contact with the mold. In addition, as the "low friction resin" here, for example, urethane,
Examples include MC nylon and Duracon.

According to a seventh aspect of the present invention, in place of the straight type, the escape of the workpiece is suppressed, and the workpiece is guided so that the workpiece is bent along the bending mold. The bending apparatus according to any one of claims 1 to 3, further comprising a restraining roller. In the invention according to claim 7, a restraining roller is provided instead of the linear type. For this reason, it is possible to further reduce the size of the bending apparatus as a whole.

The invention according to claim 8 is characterized in that the clamping means fixes the workpiece so that the tip of the workpiece is located behind the tip of the bending die. The bending apparatus according to any one of claims 1 to 7. In the invention according to claim 8, the workpiece is fixed such that the tip of the workpiece is located behind the tip of the bending die. For this reason, the bending can be performed from the foremost portion of the workpiece, and it is possible to prevent a useless portion from being generated in the workpiece.

According to a ninth aspect of the present invention, the workpiece is a hollow material, and a core that fits inside the hollow portion of the workpiece is inserted into the hollow portion from the rear end side of the workpiece. The core holding means for positioning the core between the bending rolls while the bending process is being performed is provided. It is a bending device described in the paragraph. In the invention according to claim 9, the core is held between the bending rolls in the hollow workpiece while the bending is being performed. For this reason, when the bending process is performed by the bending roll,
The bent shape of the workpiece can be stabilized by the core, and the workpiece can be prevented from being deformed unexpectedly or wrinkled.

According to a tenth aspect of the present invention, the workpiece is a hollow material, and the hollow portion of the workpiece is filled with a deformation suppressing member.
The bending apparatus according to any one of the above. In the invention according to claim 10, the deformation inhibiting member is filled in the hollow workpiece. For this reason, similarly to the case where the core is interposed, when the bending process is performed by the bending roll, the bending shape of the workpiece is stabilized by the deformation suppressing member, and unexpected deformation may occur in the workpiece. And wrinkles can be prevented. Here, the “deformation suppressing member” refers to a large number of granular bodies or elastic members,
More specifically, a resin foam, a foam material, an elastomer and the like can be exemplified.

According to an eleventh aspect of the present invention, the workpiece is fixed by clamping means provided on a bending mold formed in accordance with the bending shape of the workpiece, and the workpiece is fixed along the longitudinal direction of the workpiece. Arranging a straight mold, passing the workpiece between a bending roll having a pair of rolls with the bending mold and the straight mold, while guiding the workpiece with the straight mold, the bending mold A bending method is characterized in that the workpiece is bent along the direction.

According to the eleventh aspect of the present invention, the workpiece fixed by the clamping means provided at the tip of the bending die is passed between the bending rolls together with the bending die and the linear die for guiding the workpiece. And can be bent. For this reason, since a substantially same level of stress is applied to the workpiece when passing through the bending roll, it is possible to apply a substantially uniform stress to the workpiece.
Further, in the case of performing the bending process, only a driving force for passing the workpiece together with the bending die and the linear die is required, so that a very small driving force can be required. Furthermore, if you want to change the bending shape, you only need to change the shape of the bending mold, so that the change does not take time and effort.
I can respond quickly to the change. In addition, even if the radius of the bending shape is large, the device does not become very large, and even if the shape of the bending mold deviates from the design, it can be easily corrected. . Further, when a bending mold and a straight mold are manufactured, one set of a straight mold that is divided into two is manufactured, and one of them may be bent into a product shape, so that the manufacture is extremely easy.

According to a twelfth aspect of the present invention, in place of the straight type, a restraining roller is provided for restraining the workpiece from escaping, and the workpiece is bent along the bending mold by the restraining roller. The bending method according to claim 11, wherein the bending is performed while being guided by the bending. According to the twelfth aspect of the invention, a restraining roller is provided instead of the straight type. For this reason, further miniaturization of the entire bending apparatus can be achieved. The invention according to claim 13 is characterized in that the workpiece is a hollow material, and the hollow portion of the workpiece is filled with a deformation suppressing member and bending is performed. The bending method described in 1. above. In the invention according to claim 13, the hollow workpiece is filled with the deformation suppressing member. For this reason, similarly to the case where the core is interposed, when the bending process is performed by the bending roll, the bending shape of the workpiece is stabilized by the deformation suppressing member, and unexpected deformation may occur in the workpiece. And wrinkles can be prevented from occurring.

According to a fourteenth aspect of the present invention, in the bending process according to the thirteenth aspect, the deformation suppressing member remains in the workpiece after the bending. Is the way. In the invention according to claim 14, the deformation suppressing member remains on the workpiece after bending. For this reason, the remaining deformation suppressing member can be used as an energy absorbing member. Further, it can be used as a vibration damping member for suppressing vibration noise.

[0024]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a perspective view of a bending apparatus according to the first embodiment of the present invention.
FIG. 1 shows a state before the work W is bent. As shown in FIG. 1, a bending apparatus 1 according to the present embodiment includes a bending die 2 that is a bending die that matches a bending shape of a workpiece W that is a workpiece. At this time, when the bending die 2 is adjusted to the bent shape of the work W, the work W is formed into a shape that allows for the springback of the work W. In each of the embodiments described below, when the shape of the bending die is adjusted to the bent shape of the work, the shape is formed in consideration of the springback of the work. At the tip of the bending mold 2, a clamp 3 which is a clamp means for fixing the tip of the work W is provided. On the opposite side of the bending mold 2 in the work W, the work W A linear mold 4 that guides the work W so as to bend along is provided.

The work W is made of a linear long material having a square cross section.
A fitting groove 2 a into which the right half of the work W after bending is fitted is formed over the entire length of the bending mold 2. The fitting groove 2a has a shape surrounding the outer periphery of the work W by being combined with a linear mold. The clamp 3 has a clamp hole 3a having substantially the same shape as the left half of the tip of the work W, and the tip of the fitting groove 2a and the tip of the work W in the clamp hole 3a of the bending mold 2. The work W is fixed by being fitted. Here, the clamp 3 on the opposite side of the bending mold 2 via the workpiece W
And the surface of the linear mold 4 are arranged so as to be flush with each other.

Further, the straight mold 4 is formed with a fitting straight groove 4a for fitting the left half of the work W before bending, over the entire length of the straight mold 4. This fitting groove 4
a has a shape surrounding the outer periphery of the work W by being combined with the fitting groove 2 a formed in the bending mold 2. Then, the work W before the bending process is such that the left half is fitted into the fitting groove 4a in the linear mold,
Are arranged so as to extend along. Here, the work W is divided into right and left sides by using a diagonal line of the cross section as a dividing line, so that the fitting groove 2 a formed in the bending mold 2 and the fitting groove 4 a formed in the straight mold 4 are formed. The cross-sectional shapes are each triangular. In addition, clamp 3
Similarly, the cross section of the clamp hole 3a formed in the above is also triangular.

On the other hand, on the table 5, a bending roll 6 having a pair of a driving roll 6A and a driven roll 6B is rotatably arranged. The drive roll 6A and the driven roll 6B in the bending roll 6 are both cylindrical, and the drive roll 6A is rotated by a motor (not shown) provided below the table 5. Also,
The distance between the drive roll 6A and the driven roll 6B is set to be substantially the same as the thickness obtained by adding the bending mold 2 and the straight mold 4 with the work W interposed therebetween. By rotating the drive roll 6A in the direction of the arrow X with the bending mold 2 and the straight mold 4 sandwiching the workpiece W between the drive roll 6A and the driven roll 6B, the driven roll 6B In addition to being driven in the Y direction, the workpiece W can be sent forward (in the direction of the arrow Z). Thus, the workpiece W is bent forward along the bending mold 2 by feeding the workpiece W forward by the bending roll 6.

The bending method in the bending apparatus 1 having such a configuration will be described. First, the right half of the front end of the work W made of a long profile material manufactured by extrusion molding or the like is fitted into the fitting groove 2a formed in the bending mold 2, and the left half of the front end of the work W is Fit into the clamp hole 3a formed in the clamp 3,
The tip of the work W is fixed by the clamp 3. Next, the straight mold 4 is arranged behind the clamp 3 along the longitudinal direction of the work 4, and the left half of the work W is fitted into the fitting groove 4 a formed in the straight mold 4. At this time,
The clamp 3 and the straight mold 4 on the opposite side of the bending mold 2 via the work W are flush with each other.

Subsequently, the tip of the bending mold 2 and the clamp 3
Roller 6A and driven roll 6 in bending roll 6
B. When the tip of the bending die 2 and the clamp 3 are arranged between the bending rolls 6, the motor provided below the table 5 is driven to rotate the driving roll 6A in the direction of the arrow X. Then, the driven roll 6B is driven to rotate in the arrow Y direction, and the work W fixed by the clamp 3 moves in the arrow Z direction. Thus, the work W is passed between the rolls 6 together with the bending mold 2 and the straight mold 4.

When the driving roll 6A continues to be rotated in this state, the portion of the work W that has passed through the bending roll 6 is guided by the linear From the fitting groove 4a formed in the bending mold 2
Is moved to the fitting groove 2a formed at the bottom. Thus, the bending process is performed along the shape of the bending mold 2 in consideration of the springback. At this time, since the fitting groove 4a is formed in the straight mold 4 and the work W is fitted in the fitting groove 4a, when the work W passes through the bending roll 6, the straight mold 4 is formed. Thus, the work W can be reliably guided. Further, since the tip end of the work W to be bent is restrained by the bending die by the clamp 3, a compressive stress is applied by the bending roll 6 when passing through the bending roll 6 and the bending is performed. Stress does not concentrate on a part of the work W. Therefore, the workpiece W can be bent into a stable shape.

Then, the drive roll 6A is kept rotating as it is, and when the rear end of the work W passes through the bending roll 6, the work W is bent. When the work W is bent, the work W is inserted into the fitting groove 2 in the bending mold 2.
a. Therefore, the work W after the bending is not thrown out, and it is possible to contribute to the improvement of the working efficiency. When the work W is bent over the entire length in this manner, the bent work W is taken out from the fitting groove 2a formed in the bending die 2, and the bending of the work W is completed.

Subsequently, for example, when bending a workpiece W having the same shape, the same bending mold 2 and straight
Can be used for bending. Work W
Is changed, for example, when it is desired to change the bending shape of the work W, it is only necessary to change the shape of the bending mold 2. At this time, the conventional bending apparatus 90 shown in FIG.
As described above, since an operation such as fixing the bending guide 92 to the turntable 91 is not required, the bending shape can be easily changed. Further, for example, even if the shape of the bending mold deviates from the design, it can be easily corrected.

Next, a second embodiment of the present invention will be described. FIG. 3 is a perspective view of the bending apparatus according to the present embodiment. As shown in FIG. 3, the bending apparatus 10 according to the present embodiment has a bending die 12 adapted to the bending shape of the workpiece W, as in the first embodiment. A clamp 13 for fixing the tip of the workpiece W is provided at the tip of the bending die 12, and the workpiece W is bent along the bending die 12 on the opposite side of the bending die 12 in the workpiece W. Is provided with a linear mold 14 for guiding the work W as described above.

A fitting groove 12a is formed in the bending die 12 over the entire length of the bending die 12, a clamp hole 13a is formed in the clamp 13, and a straight die 14 is formed.
Has a fitting groove 14a formed over the entire length of the linear mold 14. The fitting grooves 1 formed in these bending dies 12
2a, the clamp hole 13a, and the fitting groove 14a formed in the linear mold 14 are formed so as to be slightly larger than the cross-sectional shape of the work W. Fitting grooves 12a, clamp holes 13a formed in these bending dies 12,
The first to third liner members 16 to 18 made of a low-friction resin, for example, Duracon, are interposed in the fitting grooves 14a formed in the linear mold 14, respectively.

The outer shape of the first liner member 16 is substantially the same as the fitting groove 12 a formed in the bending mold 12.
The first liner member 16 is fitted in the fitting groove 12a.
Inside the first liner member 16, a first fitting groove 16a into which the right half of the work W after bending is fitted is formed. The outer shape of the second liner member 17 is
3, and the second liner member 17 is fitted into the clamp hole 13a. Inside the second liner member 17, a second fitting groove 17a into which the left half of the front end of the work W fits is formed. Further, the outer shape of the third liner member 18 is substantially the same as the fitting groove 14a formed in the linear mold 14, and the third liner member 18 is fitted in the fitting groove 14a. Here, the work W is divided into a right side and a left side by a straight line parallel to one side of the cross section. Therefore, the first fitting groove 16 formed in the first liner member 16 is formed.
The cross-sectional shape of “a” and the cross-sectional shape of the third fitting groove 18 a formed in the third liner member 18 are both vertically elongated rectangles. Similarly, the second fitting groove 17a formed in the second liner member 17 has a vertically long rectangular shape.

Further, although not shown, the bending apparatus according to the present embodiment has the same bending roll as that of the first embodiment. Between this bending roll, clamp 1
The work W fixed by 3 passes along with the bending die 12 and the straight die 14 to perform bending.

Next, a bending method using the bending apparatus according to the present embodiment will be described. First, the right half of the tip of the work is fitted into the first fitting groove 16a of the first liner member 16 attached to the bending mold 12, and the left half of the tip of the work W is attached to the clamp 13. The second in the two-liner member 17
The tip end of the work W is fixed by being fitted into the fitting groove 17a. Next, behind the clamp 13, a third liner member 18 in which the left half of the work W is attached to the linear mold 14.
Is fitted in the third fitting groove 18a formed in the second groove. At this time, the clamp 13 and the straight mold 14 on the opposite side of the bending mold 12 via the work W are flush with each other.

Thereafter, similarly to the first embodiment, the work W can be bent by passing the work W together with the bending mold 12 and the straight mold 14 between the bending rolls 6. Thus, in the present embodiment, the same effects as those of the first embodiment can be obtained. In addition, if the cross section of the work W is slightly changed in size, the bending mold 12, the clamp 13, and Even if the linear mold 14 is not changed, it can be dealt with only by changing the first liner member 16, the second liner member 17, and the third liner member 18. Further, since the liner member is formed of a low-friction resin, the work W can be smoothly bent when bending the work W, and the work W is not brought into contact with a metal member such as a mold. Thus, the work W can be prevented from being damaged. Furthermore, even after the work W is painted, the work W can be bent without damaging the paint.

Next, a third embodiment of the present invention will be described. FIG. 4 is a perspective view of the bending apparatus according to the present embodiment. As shown in FIG. 4, the bending apparatus 20 according to the present embodiment includes a bending die 22 adapted to the bending shape of the workpiece W, as in the above embodiments. A clamp 23 for fixing the tip of the work W is provided at the tip of the bending mold 22, and the work W is bent along the bending mold 22 on the side of the work W opposite to the bending mold 22. A linear mold 24 for guiding the work W is provided.

A fitting groove 22a is formed in the bending die 22 over the entire length of the bending die 22, a clamp hole 23a is formed in the clamp 23, and a straight die 24 is formed.
A fitting groove 24a is formed over the entire length of the linear mold 24 and the bending mold 22. Fitting groove 2 of these
2a, draft angles are formed in the upper and lower positions thereof, and the upper side and the lower side of the fitting groove 22a are each formed at an angle θ of 2 ° to 5 °.
It is spread up and down. Here, the work W is divided into a right side and a left side by a straight line parallel to one side of the cross section, as in the second embodiment. For this reason, the sectional shape of the fitting groove 22a formed in the bending mold 22 is trapezoidal, and the sectional shape of the fitting groove 24a formed in the straight mold 24 is a vertically long rectangular shape. . The clamp hole 23a formed in the clamp 23 also has a vertically long rectangular shape. If the draft angle is 2 ° or less, the effect of the draft angle is not sufficient. If the draft angle is 5 ° or more, the gap between the workpiece and the workpiece becomes too large and causes wrinkles or the like when bending the workpiece. As a result, the draft is 2 ° to 5 °.
It is appropriate to set the angle to θ.

Furthermore, the bending apparatus according to the present embodiment has a bending roll similar to that of the first embodiment, although not shown. A clamp 23 is provided between the bending rolls.
The workpiece W fixed by the above passes along with the bending mold 22 and the linear mold 24 to perform bending.

In the bending apparatus according to this embodiment, bending can be performed in the same procedure as in the first embodiment. The procedure will be described. The right half of the tip end of the work W is bent into the fitting groove 2 formed in the mold 22.
2a, the left half of the tip of the work W is fitted into a clamp hole 23a formed in the clamp 23, and the tip of the work W is fixed by the clamp 23. Next, behind the clamp 23, the work W
Is fitted into a fitting groove 24a formed in the linear mold 24.

Thereafter, as in the first embodiment, the work W can be bent by passing the work W together with the bending mold 22 and the straight mold 24 between the bending rolls 6. Thus, in the present embodiment, the same effects as those of the first embodiment can be obtained. In addition, since the draft is formed in the fitting groove 22a of the bending die 22, it is bent and fitted. The work W fitted in the groove 22a can be easily separated from the fitting groove 22a.

Although not shown, in addition to the fitting groove 22a in the bending mold 22, the fitting groove 2a in the straight mold 24 is used.
A mode in which a draft is formed also in 4a can be adopted.
By forming a draft in the fitting groove 24a, when the work W passes between the bending rolls and moves from the fitting groove 24a of the straight mold 24 to the fitting groove 22a of the bending mold 22,
The movement becomes smooth.

Next, a fourth embodiment of the present invention will be described. FIG. 5 is a perspective view of the bending apparatus according to the present embodiment. As shown in FIG. 5, the bending apparatus 30 according to the present embodiment includes a bending die 32 adapted to the bending shape of the work W, as in the above embodiments. At the tip of the bending mold 32, a clamp 33 for fixing the tip of the work is provided. On the opposite side of the bending mold 32 in the work W, the work W is bent along the bending mold 32. Is provided with a linear mold 34 for guiding the work W.

Also, in this embodiment, unlike the above embodiments, no fitting groove is formed in the bending mold 32. On the other hand, in the clamp 33, a clamp hole 33a having substantially the same shape as the cross-sectional shape of the work W is formed.
The front end of the work W is fixed by the clamp holes 33a. Here, the surface of the clamp 33 and the surface of the linear mold 34 on the opposite side of the bending mold 32 via the workpiece W are arranged so as to be flush.

Further, in the linear mold 34, a fitting groove 34a into which the work W before the bending process is entirely fitted is formed over the entire length of the linear mold 34. Therefore, the cross-sectional shape of the fitting groove 34 a formed in the linear mold 34 is substantially the same as the cross-sectional shape of the work W.

In the bending apparatus according to this embodiment, bending can be performed in the same procedure as in the first embodiment. Explaining the procedure, the tip end of the work W is clamped by a clamp hole 33a formed in the clamp 33.
, And the tip of the work W is fixed by the clamp 33. Next, on the rear side of the clamp 33, the left half of the work W is inserted into the fitting groove 34a formed in the linear mold 34.
To fit. Thereafter, as in the first embodiment, the work W can be bent by passing the work W together with the bending mold 32 and the linear mold 34 between the bending rolls 6. Thus, in the present embodiment, the same effects as in the first embodiment can be obtained, and since there is no need to form a fitting groove in the bending mold 32, the manufacturing of the bending mold becomes easy. The effect is obtained. Further, since the work W is not fitted into the fitting groove formed in the bending mold after bending, it is easy to detach the work W from the bending mold after bending. . The straight mold having the fitting groove formed therein can be manufactured more easily than the bending mold.

Next, a fifth embodiment of the present invention will be described. FIG. 6A is a plan view of the bending apparatus according to the present embodiment, and FIG. 6B is a cross-sectional view taken along line AA of FIG.
As shown in FIG. 6A, the bending apparatus 40 according to the present embodiment has a bending die 42 as in the above-described embodiments, and a tip of the workpiece W is provided at the tip of the bending die 42. A clamp 43 for fixing the portion is provided. FIG.
As shown in (b), in the present embodiment, the work W
Has a triangular cross section. Further, a fitting groove 42 a is formed in the bending die 42 over the entire length of the bending die 42. The depth of the fitting groove 42a is substantially the same as the thickness of one side of the work W, as shown in FIG. A substantially triangular clamp hole (not shown) for fitting the work W is formed in the clamp 43 to fix the tip of the work W.

In this embodiment, the table 4
5, a pair of driving rolls 46A and driven rolls 46B
The bending roll 46 is rotatably disposed.
Further, at the position behind the clamp 43 via the driven roll 46B, the work W is guided so that the work W is bent along the bending mold 42 by preventing the work W from escaping when bending is performed. A suppression roll 44 is rotatably disposed. The drive roll 46A, the driven roll 46B, and the restraining roll 44 of the bending roll 46 include a straight line connecting the rotation center of the drive roll 46A and the rotation center of the driven roll 46B, the rotation center of the driven roll 46B and the rotation center of the restraining roll 44. Are arranged so that the straight line connecting them forms a substantially right angle. The drive roll 46A that comes into contact with the bending mold 42 has a cylindrical shape. Further, the driven roll 46B and the restraining roll 44 have substantially the same shape, and as shown in the sectional shape of the driven roll 46B in FIG. Has made.

In the bending apparatus 40 according to the present embodiment having such a configuration, the work W is fixed with the front end of the work W fixed by the front end of the bending mold 42 and the clamp 43.
Is passed between the bending rolls 46 from the tip side of the sheet. At this time, the work W includes the driven roll 46B and the restraining roll 4
Moving along 4. If the suppression roll 44 is not provided, the work W escapes in a direction away from the bending mold 42 in a plan view when the work W is bent, but since the suppression roll 44 is provided. The work W can be bent along the bending mold 42.

According to this embodiment, in addition to the effects shown in the first embodiment, the straight die 4 as in the first embodiment is not required, so that the bending apparatus can be further miniaturized. be able to.

Next, a sixth embodiment of the present invention will be described. 7 is a plan view of the bending apparatus according to the present embodiment, FIG. 8A is a cross-sectional view taken along line AA of FIG. 7, and FIG.
FIG. 8 is a sectional view taken along line BB of FIG. 7. As shown in FIG.
The bending apparatus 50 according to the present embodiment has a bending die 52 that matches the bending shape of the work W. At the tip of the bending mold 52, a clamp 53 for fixing the tip of the work W is provided.
On the opposite side of 2, a straight mold 54 is provided for guiding the work W so that the work W is bent along the bending mold 52.

Here, as shown in FIG. 7, the tip of the straight mold 54 in the present embodiment is disposed so as to be flush with the tip of the bending mold 52. In addition, the clamp 53
As shown in FIGS. 8A and 8B, is fixed to the bending mold so as to be sandwiched between the fitting groove 52a in the bending mold 52 and the fitting groove 54a in the straight mold 54. The rear end of the clamp 53 is disposed between the bending rolls 6. The front end of the workpiece W comes into contact with the position of the rear end of the clamp 53.

Therefore, at the time when the bending is started, the foremost portion of the work W is located between the bending rolls 6, so that the entire work can be bent.
For this reason, the end of the workpiece W is not subjected to bending, that is, there is no useless portion.

Next, a seventh embodiment of the present invention will be described. FIG. 9A is a perspective view illustrating a state before bending of the bending apparatus according to the present embodiment,
(B) is a perspective view showing the state after the bending.
As shown in FIG. 9A, a bending apparatus 60 according to the present embodiment is almost the same as the first embodiment,
The same members are denoted by the same reference numerals and description thereof will be omitted. In the present embodiment, as compared with the first embodiment, the core 61 is fitted inside the work W made of a hollow material, and the core 61 is placed between the bending rolls 6 during bending. The only difference is that a wire 62 serving as a core holding means for arranging the core is provided.

A method of bending by the bending apparatus 60 according to this embodiment will be described. As shown in FIG. 9A, a core 61 is inserted into the tip of a hollow work W, the work W is sandwiched between a bending mold 2 and a straight mold 4, and the core 61 is placed between bending rolls 6. Position. Subsequently, the driving roll 6
By rotating A, the work W is moved in the direction of the arrow Z together with the bending mold 2 and the straight mold 4. During this time, FIG.
As shown in (b), the core 6 is moved in accordance with the movement of the workpiece W.
The core 61 is pulled by the wire 62 so that the core 1 does not move, and the core 61 is held so that the core 61 is located between the bending rolls 6. With the position of the core 61 unchanged, the drive roll 6A is rotated and the work W is fed to perform bending. At this time, the bending stress is applied to the work W between the bending rolls 6, but the core 61 is always located between the bending rolls 6. Therefore, it is possible to prevent the work W from being deformed unexpectedly or from wrinkling.

In the present embodiment, instead of using the core 61, a resin foam as a deformation suppressing member may be filled in the hollow portion of the work W over the entire region in the longitudinal direction of the work W. By filling the resin foam in advance, the resin foam has the same effect as the core 61 between the bending rolls 6, so that unexpected deformation or wrinkling of the work W is prevented. Can be prevented. In addition, by leaving the resin foam in the work W even after the bending, the resin foam itself functions as an energy absorbing member and a vibration suppressing member for suppressing vibration noise. Therefore, for example, when the work W is used for a bumper reinforcing member of an automobile, the strength against collision is increased, and when the work W is used for a structural material or a covering material for a vehicle or a building, vibration noise caused by noise is suppressed. be able to.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, as shown in FIG. 10, when the cross section of the work W is U-shaped, the protrusion 63 that enters the opening of the work W is inserted into the fitting groove 63 a formed in the bending mold 63.
a can be formed in advance. Such a protrusion 63a
Is provided, it is possible to prevent the projection 63a from wrinkling the work W, and to reliably bend the work W having a U-shaped cross section.

Further, the shapes of the fitting grooves formed in the bending die and the straight die can be appropriately set according to the shape of the work W. For example, as shown in FIG. 11, when the cross-sectional shape of the work W is a trapezoid, the width of the fitting groove 64 a formed in the bending mold 64 in the height direction is formed in the straight mold 65. An embodiment having a taper that is smaller than the width of the height 65a in the height direction and gradually decreases as the distance from the linear mold 65 increases.

Further, in each of the above embodiments, one of the pair of bending rolls is a drive roll and the other is a driven roll, but it is also possible to adopt a mode in which both rolls are drive rolls.

In addition to a circular bending process having the same curvature, it is also possible to perform a bending process even if the curvature changes in one curve such as a part of a parabola, hyperbola, or cycloid curve. Can be. Moreover, it is possible to cope with such bending work of various shapes only by changing the shape of the bending die. However,
Shapes such as an S-shaped curve whose curvature changes from a positive value to a negative value are difficult to bend.

[0063]

As described above, claim 1 of the present invention.
According to the eleventh aspect of the present invention, the bending can be performed such that a stress is applied to the workpiece substantially uniformly. Further, the entire apparatus is simple, and the bending can be performed with a very small driving force. further,
When it is desired to change the bending shape, it is only necessary to change the shape of the bending die. Therefore, it is possible to respond to the change promptly without any trouble in installation.

According to the second aspect of the present invention, the workpiece after bending can be reliably held in the fitting groove formed in the bending die, thereby contributing to an improvement in working efficiency. Can

According to the third aspect of the present invention, the workpiece after bending can be easily taken out from the bending mold.

According to the fourth aspect of the invention, when the workpiece passes through the bending roll, the workpiece can be reliably guided. Further, when the fitting groove is not formed in the bending die, the bending die can be easily manufactured.

According to the fifth aspect of the present invention, the workpiece passing through the bending roll can easily come out of the linearly formed fitting groove, and can be reliably moved from the linear type to the bending type.

According to the sixth aspect of the invention, the workpiece can be smoothly bent. Further, it is possible to prevent a situation in which the workpiece comes into contact with the mold and the workpiece is damaged.

According to the seventh or twelfth aspect, it is possible to further reduce the size of the bending apparatus as a whole.

According to the eighth aspect of the present invention, the bending can be performed from the foremost portion of the workpiece, so that a useless portion of the workpiece can be prevented.

According to the ninth, tenth, and thirteenth aspects of the present invention, the bending shape of the workpiece is stabilized by the core when the bending process is performed by the bending roll, and Unexpected deformation or wrinkling can be prevented.

According to the fourteenth aspect, the remaining deformation suppressing member can be used as an energy absorbing member. Further, it can be used as a suppressing member for suppressing vibration noise.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a bending apparatus according to a first embodiment.

FIG. 2 is a perspective view showing a state after bending of the bending apparatus according to the first embodiment.

FIG. 3 is a perspective view of a bending apparatus according to a second embodiment.

FIG. 4 is a perspective view of a bending apparatus according to a third embodiment.

FIG. 5 is a perspective view of a bending apparatus according to a fourth embodiment.

FIG. 6A is a plan view of a bending apparatus according to a fifth embodiment, and FIG. 6B is a sectional view taken along line AA of FIG.

FIG. 7 is a plan view of a bending apparatus according to a sixth embodiment.

8A is a cross-sectional view taken along line AA of FIG. 7, and FIG.
FIG. 8 is a sectional view taken along line BB of FIG. 7.

FIG. 9A is a perspective view illustrating a state before bending of a bending apparatus according to a seventh embodiment, and FIG.
FIG. 2 is a perspective view showing a state after the bending.

FIG. 10 is a front view showing a modification of the present invention.

FIG. 11 is a front view showing another modification of the present invention.

FIG. 12 is a front view showing an outline of a conventional bending apparatus.

FIG. 13 is a perspective view showing another conventional bending process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bending apparatus 2 Bending die 2a Fitting groove (formed in bending die) 3 Clamp (clamping means) 3a Clamp hole 4 Straight die 4a Fitting groove (formed in straight die) 6 Bending roll 6A Drive Roll 6B Follower roll 16 First liner member 17 Second liner member 18 Third liner member 44 Suppression roll 61 Core 62 Wire (core holding means) W Work

Continued on the front page (72) Inventor Susumu Shiotani 52, Taro, Mishima-shi, Shizuoka Pref. Mitsuo 1-34-1 Kambara, Kambara-cho, Anbara-gun, Shizuoka Prefecture Nippon Light Metal Co., Ltd. Group Technology Center F term (reference) 4E063 AA06 BC10

Claims (14)

[Claims] 1. A method according to claim 1, further comprising a bending mold formed in accordance with a bending shape of the workpiece, a clamping means for fixing a tip of the workpiece to the bending mold, and The workpiece has a linear shape that guides the workpiece so that the workpiece is bent along the bending die, and the workpiece fixed by the clamp unit is bent. A bending apparatus, comprising: a bending roll having a pair of rolls for performing a bending process by passing the die along with the linear die. 2. The bending mold is formed with a fitting groove into which the workpiece after bending is fitted, and the fitting groove is combined with the linear mold to form the workpiece. 2. A shape surrounding the outer periphery.
4. The bending apparatus according to claim 1. 3. The bending apparatus according to claim 2, wherein a draft is formed in the fitting groove formed in the bending die. 4. A fitting groove for fitting the workpiece before processing is formed in the linear mold, and the fitting groove is formed on the outer periphery of the workpiece by combining with the bending mold. The bending device according to any one of claims 1 to 3, wherein the bending device has a shape surrounding the bending device. 5. The bending apparatus according to claim 4, wherein a draft is formed in the linearly formed fitting groove. 6. A liner member made of a low-friction resin is interposed at a portion of the bending mold and the straight mold that comes into contact with the workpiece.
The bending apparatus according to any one of claims 1 to 5. 7. In place of the linear type, a restraining roller is provided to prevent the workpiece from escaping and guide the workpiece so that the workpiece bends along the bending mold. The bending apparatus according to any one of claims 1 to 3, wherein: 8. The apparatus according to claim 1, wherein the clamping means fixes the workpiece such that a tip of the workpiece is located behind a tip of the bending die. The bending apparatus according to any one of the above. 9. The workpiece is a hollow material, and a core that fits inside the hollow portion of the workpiece is inserted into the hollow portion from a rear end side of the workpiece. The bending process according to any one of claims 1 to 8, wherein a core holding means for positioning the core between the bending rolls is provided during the bending. apparatus. 10. The workpiece according to claim 1, wherein the workpiece is a hollow material, and a hollow portion of the workpiece is filled with a deformation suppressing member. 4. The bending apparatus according to claim 1. 11. The work piece is fixed by a clamp means provided on a bending mold formed in accordance with a bending shape of the work piece, and a linear mold is arranged along a longitudinal direction of the work piece, The work is passed along a bending roll having a pair of rolls together with the bending die and the straight die, and the work is guided along the bending die while guiding the work with the straight die. A bending method characterized by bending an object. 12. A bending roller which is provided in place of the linear type, and which is provided with a restraining roller for restraining escape of the workpiece, and guides the workpiece to bend along the bending mold by the restraining roller. The bending method according to claim 11, wherein the bending is performed. 13. The work according to claim 11, wherein the work is a hollow material, and the work is bent by filling a hollow portion of the work with a deformation suppressing member. Bending method. 14. The bending method according to claim 13, wherein the deformation suppressing member remains in the workpiece after the bending.