JP3696913B2 - Bending machine - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a bending apparatus for bending a pipe according to the shape of a bending die.
[0002]
[Prior art]
Conventionally, as disclosed in JP-A-6-182451, when a pipe is bent, a wiper die is disposed in the vicinity of the bending die so as to face the pressure die, and the inner side of the bent pipe is wrinkled. Is prevented from occurring. As indicated by a two-dot chain line in FIG. 5, the wiper mold 100 is more effectively provided as close as possible to the bending mold 102, so that the tip 106 of the wiper mold 100 has a diameter of the pipe of the bending mold 102. It is thin so that it can be inserted into the corresponding groove 104.
[0003]
[Problems to be solved by the invention]
However, in such a conventional device, the tip 106 of the wiper mold 100 has a shape that tends to be unevenly worn, so that it is not sufficient in terms of durability, and the shape is complicated, so that the processing is not easy. Further, when the worn wiper mold 100 is reshaped and reattached, or when the worn wiper mold 100 is replaced with a new wiper mold 100, the groove 104 of the bending mold 102 is projected into the groove 104. The portion 108 is inserted for positioning, and the shape is complicated, so that sufficient processing accuracy cannot be ensured. For this reason, the position of the tip 106 of the wiper mold 100 is slightly shifted and bent. In some cases, the occurrence of wrinkles cannot be sufficiently prevented, and there is a case in which sufficient restoreability cannot be ensured.
[0004]
Therefore, the present invention aims to solve the above-mentioned problems, and can improve the durability of the wiper mold, and can be easily processed by the wiper mold, and the bending process has improved the resilience when the wiper mold is mounted. To provide an apparatus.
[0005]
[Means for Solving the Problems]
In order to achieve this object, the present invention has the following configuration as means for solving the problems. That is,
A bending die corresponding to the bending shape is rotatably supported on a central axis standing on a bending arm, and the bending die is fixed to one end of a fixing member attached to the apparatus main body,
And a driving source for rotating the bending arm about the bending mold while supporting the bending arm on the apparatus main body so as to be rotatable on the same axis as the central axis,
In addition, a clamping die that moves toward the pipe is provided on the bending arm, and a clamping die that sandwiches the pipe by the clamping die is provided opposite to the clamping die.
The pipe is sandwiched between a wiper mold fixed to the bending mold and in contact with the outer periphery of the pipe, and a pressure mold provided facing the wiper mold and moving toward the pipe, and as the bending arm rotates. This is a configuration of a bending apparatus characterized by bending the pipe.
[0006]
The wiper mold may be formed in a rectangular shape, and the bending mold may have a groove in which the wiper mold is mounted.
[0007]
[Action]
In the bending apparatus having the above-described configuration, the clamping mold moves toward the pipe, the pipe is clamped by the clamping mold and the clamping mold, and the pressure mold moves toward the pipe, and the wiper mold and the pressure mold The pipe is bent by rotating the bending arm between the pipes. At this time, since the bending die does not rotate, the wiper die can be formed into a simple shape such as a rectangle that is easy to process, so that durability and workability are improved.
[0008]
【Example】
Embodiments of the present invention will be described below in detail with reference to the drawings.
As shown in FIGS. 1 to 4, 1 is a bending die, and a semicircular groove 2 corresponding to the diameter of the pipe P to be bent is formed on the outer periphery of the bending die 1 according to the bending radius. . The bending die 1 is rotatably mounted on a central shaft 6 erected on a bending arm 4 via a bearing 8, and includes a washer 10 inserted into the central shaft 6 and a nut 12 screwed into the central shaft 6. The stopper is designed.
[0009]
The bending arm 4 is supported by the apparatus main body 14 so as to be rotatable on the same axis as the center of the central shaft 6. The bending arm 4 is driven by a driving source (not shown) so as to be rotated around the center of the bending die 1. It is configured. Further, a clamping die 16 is supported on the bending arm 4 so as to be movable toward the pipe P, and is driven toward the pipe P by driving a hydraulic cylinder 18 disposed on the bending arm 4. It is configured. A semicircular groove 20 corresponding to the diameter of the pipe P is also formed in the clamping die 16.
[0010]
Further, a clamp die 22 is fixedly disposed on the bending arm 4 so as to be close to the bending die 1 and face the clamping die 16 with the pipe P in between. A semicircular groove 24 corresponding to the diameter is formed. When the clamping die 16 is moved toward the pipe P, the clamping die 16 and the clamp die 22 can be used to sandwich the pipe P.
[0011]
On the other hand, one end of the fixing member 26 attached to the apparatus main body 14 is fixed to the bending mold 1 with a bolt (not shown), and the bending mold 1 is fixed to the apparatus main body 14. The bending die 1 is provided with a mounting groove on the side opposite to the clamp die 22. The mounting groove is formed by a vertical wall 28a formed in a plane substantially perpendicular to the pipe P and passing through the center of the central axis 6, and a bottom wall 28b formed in parallel with the axial direction of the pipe P. Further, a key groove 30 parallel to the axial direction of the central shaft 6 and a key groove 32 perpendicular to the key groove 30 are formed on the bottom wall 28b.
[0012]
In the mounting groove, a rectangular wiper mold 34 is mounted in close contact with the vertical wall 28a and the bottom wall 28b, respectively. On the bottom wall 28 b side of the wiper mold 34, a key convex portion 36 is formed in parallel with the axial direction of the central shaft 6, and a key groove 38 is formed orthogonal to the key convex portion 36. A key convex portion 36 is inserted into the key groove 30, and a key 40 is attached to both the key grooves 32 and 38. The wiper mold 34 is also formed with a semicircular groove 42 corresponding to the diameter of the pipe P.
[0013]
Further, a pressure die 44 is supported on the apparatus main body 14 so as to be movable toward the pipe P so as to face the wiper die 34 on the side opposite to the pipe P. In the present embodiment, the pressure die 44 is further supported so as to be movable along the axial direction of the pipe P. The pressure die 44 is configured to move toward the pipe P by driving a hydraulic cylinder 46 provided in the apparatus main body 14, and also configured to be movable in the axial direction of the pipe P by driving the hydraulic cylinder 48. Has been.
[0014]
The pressure die 44 is also provided with a semicircular groove 50 corresponding to the diameter of the pipe P. The pressure die 44 is moved toward the pipe P, and the pipe P is moved by the wiper die 34 and the pressure die 44. It is comprised so that it can pinch | interpose. At that time, the pressing force by the hydraulic cylinder 44 is adjusted to such an extent that the pipe P can be pulled out in the axial direction, and the pressing force by the hydraulic cylinder 44 is adjusted so that the generation of wrinkles by the wiper mold 34 is effectively performed. Is done.
[0015]
Next, the operation of the bending apparatus of this embodiment will be described.
First, as shown in FIG. 1, the clamping die 16 and the pressure die 44 are both moved to positions separated from the clamp die 22 and the wiper die 34 by driving the hydraulic cylinders 18 and 46, respectively. Then, the pipe P to be bent is mounted in the grooves 24, 2 and 42 of the clamp die 22, the bending die 1 and the wiper die 34, respectively.
[0016]
Then, both the hydraulic cylinders 18 and 46 are driven to move the clamping die 16 and the pressure die 44 toward the pipe P, and the clamping die 16 and the clamp die 22 hold the pipe P. The pipe P is sandwiched between the wiper mold 34. Next, the bending arm 4 is rotated around the bending die 1 by a driving source (not shown).
[0017]
As a result, the pipe P is sandwiched between the clamping die 16 and the clamping die 22, and the pipe P is wound around the groove 2 of the bending die 1 while being drawn out in the axial direction. At that time, the pipe P moves while sliding in the groove 42 of the wiper mold 34, thereby preventing the wiper mold 34 from wrinkling inside the pipe P.
[0018]
The bending reaction force during bending is received by the pressure die 44. In this embodiment, the pressure die 44 is driven by the hydraulic cylinder 48 and moved along the axial direction of the pipe P. A directional compression force is applied, and thinning of the outside of the pipe P is prevented. The pressure die 44 may be moved in the axial direction as appropriate according to the thickness of the pipe P.
[0019]
When the bending process is completed, the hydraulic cylinders 18 and 46 are driven, the clamping die 16 and the pressure die 44 are separated from the pipe P, the bending arm 4 is rotated by a driving source (not shown), and is returned to the original position. The hydraulic cylinder 48 is driven to move the pressure die 44 in the axial direction of the pipe P to return it to the original position.
[0020]
Then, when bending the same pipe P, the pipe P is moved by a predetermined amount in the axial direction, and bending is performed in the same manner as described above. Alternatively, when bending a new pipe P, the pipe P is mounted in the grooves 24, 2 and 42 as described above and bent similarly.
[0021]
When bending the pipe P, unlike the ordinary draw bending in which the bending die rotates, the bending die 1 does not rotate. Therefore, the groove 2 of the bending die 1 is provided only on the clamp die 22 side with respect to the vertical wall 28a. Just do it. Accordingly, the bending die 1 and the wiper die 34 can be integrally formed from one material, and can be attached to the attachment groove formed by the vertical wall 28a and the bottom wall 28b as in the above-described embodiment. The rectangular wiper type 34 may be used.
[0022]
Accordingly, the wiper mold 34 does not need to have a shape with a small thickness or the like, and can have a uniform cross-sectional shape in which uneven wear hardly occurs, so that the durability is improved and the shape is easy to process. It can be. Further, when the pipe P is bent, the wiper die 34 is worn, but since it can be formed into a simple shape, it is easy to re-form, and when re-forming, the bottom wall 28b and the wiper die 34 are formed. What is necessary is just to adjust the height with a shim or the like between.
[0023]
Further, the wiper mold 34 is applied to the vertical wall 28a and the bottom wall 28b, and the key protrusions 36 and the keys 40 of the wiper mold 34 can be inserted into the key grooves 30 and 32 formed on the bottom wall 28b for positioning. Therefore, since it can position by simple shapes, such as a wall and a keyway, the processing precision can fully be ensured and the restoring | restoration property at the time of replacing | exchanging the wiper type | mold 34 improves. The wiper mold 34 is not limited to a rectangular shape, and can be implemented in other simple shapes. In this case, the mounting groove of the bending mold 1 may be formed in accordance with the shape.
[0024]
The present invention is not limited to such embodiments as described above, and can be implemented in various modes without departing from the gist of the present invention.
[0025]
【The invention's effect】
As described above in detail, the bending apparatus of the present invention is
Since the bending mold does not rotate during bending, the bending mold and the wiper mold can be formed integrally, or a simple-shaped wiper mold can be formed, so that uneven wear hardly occurs and durability is improved. In addition, there is an effect that it is easy to process. Furthermore, since the wiper mold can have a simple shape, it is easy to re-mold. In addition, since the wiper type can be positioned by a wall or a keyway, the processing accuracy can be sufficiently ensured, and the resilience upon replacement can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of an essential part of a bending apparatus as an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along a plane perpendicular to the pipe of the bending apparatus according to the present embodiment.
FIG. 3 is a cross-sectional view on a horizontal plane before the start of bending of the bending apparatus of the present embodiment.
FIG. 4 is a cross-sectional view on a horizontal plane at the end of bending of the bending apparatus of the present embodiment.
FIG. 5 is a perspective view of a conventional bending die and a wiper die.
[Explanation of symbols]
P ... pipe 1,102 ... bending die 4 ... bending arm 6 ... center shaft 14 ... device body 16 ... clamping die 22 ... clamping die 28 ... mounting groove 28a ... vertical wall 28b ... bottom wall 34,100 ... wiper die 44 ... pressure Type

Claims (2)

A bending die corresponding to the bending shape is rotatably supported on a central axis standing on a bending arm, and the bending die is fixed to one end of a fixing member attached to the apparatus main body,
And a drive source for rotating the bending arm about the bending mold while supporting the bending arm on the apparatus main body so as to be rotatable on the same axis as the central axis,
In addition, a clamping mold that moves toward the pipe is provided on the bending arm, and a clamping mold that sandwiches the pipe by the clamping mold is provided opposite to the clamping mold.
The pipe is sandwiched between a wiper mold fixed to the bending mold and in contact with the outer periphery of the pipe, and a pressure mold provided facing the wiper mold and moving toward the pipe, and as the bending arm rotates. A bending apparatus for bending the pipe. The bending apparatus according to claim 1 , wherein the wiper mold is formed in a rectangular shape, and a groove in which the wiper mold is mounted is formed in the bending mold.

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