JP3637658B2 - Metal pipe bending machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a metal pipe bending apparatus suitable for bending a plurality of portions of a metal pipe with different bending radii.
[0002]
[Prior art]
Conventionally, a wide range of metal pipe bending devices such as press bending, compression bending, roll bending, and drawing bending have been proposed. However, the bending type metal pipe bending device using an NC machine is the most popular. Many are used.
[0003]
In this metal pipe bending apparatus, as shown in FIGS. 6A to 8C, a plurality of pipe bending molds 2 and 2 ′ having different bending radii are vertically stacked on the rotating shaft 1. Then, it is fixed to the rotary shaft 1 with a common bolt 3. On the outer peripheries of these pipe bending dies 2 and 2 ', bending formed surfaces 4 and 4' formed of grooves along the circumferential direction, and tangential extensions extending in a tangential direction on the bent forming surfaces 4 and 4 'are provided. Portions 5 and 5 'are provided. The tangential extensions 5, 5 'are provided adjacent and parallel to each other. An automatic pipe feeder 7 for supplying the metal pipe 6 to be processed is disposed on one side of the tangential extension portions 5 and 5 ′ at the stop standby position in the tangential extension direction. The automatic pipe feeder 7 can move up and down and move horizontally in the horizontal direction. A moving clamp 8 for holding the metal pipe 6 supplied from the automatic pipe feeder 7 is disposed on the opposite side of the tangential extension direction at the stop standby position of the tangential extension portions 5 and 5 '. ing. The moving clamp 8 can move up and down and move horizontally in the horizontal direction. In addition, pipe pressers 9 and 9 'that are operated by a hydraulic cylinder facing the tangential extension parts 5 and 5' at the stop standby position of the tangential extension parts 5 and 5 'are arranged, respectively. The tools 9, 9 'are supported by a common rotating body 10 that rotates synchronously with the rotating shaft 1 within a predetermined range. Further, between the moving clamp 8 and the pipe retainers 9 and 9 ', the metal pipe 6 having the height of the bending surfaces 4 and 4' in any of the pipe bending molds 2 and 2 'is pressed. Moving presser molds 11 and 11 'are arranged so that they can move. Further, a metal core 12 is supported on the moving clamp 8 side so that it can be inserted into the metal pipe 6 supplied from the automatic pipe feeder 7 toward the moving clamp 8 side. It is moved together with the clamp 8.
[0004]
Next, an operation of bending the metal pipe 6 by such a metal pipe bending apparatus will be described with reference to FIGS.
[0005]
As shown in FIG. 6 (A), the metal pipe 6 having a required length is moved toward the moving clamp 8 at the height of the bending surface 4 of the pipe bending die 2 by the automatic pipe feeder 7, for example. The automatic pipe feeder 7 is fed while moving in the left direction in the figure. In this process, the cored bar 12 is inserted into the metal pipe 6 from the tip side.
[0006]
As shown in FIG. 6 (B), when the distal end side of the metal pipe 6 reaches the standby position of the moving clamp 8, the distal end side of the metal pipe 6 is clamped by the moving clamp 8. When the moving clamp 8 clamps the tip end side of the metal pipe 6 in this way, the automatic pipe feeder 7 releases the metal pipe 6 and moves back to the standby position. Therefore, in this state, the metal pipe 6 is cantilevered by the moving clamp 8.
[0007]
In this state, the movable presser die 11 moves forward and presses the metal pipe 6, and the pipe presser 9 moves forward so that the bending start end of the metal pipe 6 becomes the tangential extension 5 of the pipe bending die 2. Fix it.
[0008]
In this state, when the pipe bending die 2 is rotated as shown in FIG. 6C by the rotation driving means such as a motor (not shown) through the rotation shaft 1, the pipe presser 9 is also rotated as the rotation shaft 1 rotates. The metal pipe 6 is synchronously rotated within a predetermined range together with the moving body 10, whereby the metal pipe 6 is bent along the bending surface 4 of the pipe bending die 2.
[0009]
At this time, since the metal pipe 6 is pulled by the amount wound around the bending surface 4, the moving clamp 8, the core metal 12, and the moving presser die 11 move toward the pipe bending die 2 by the amount the metal pipe 6 is pulled. . If the metal core 12 is inserted into the metal pipe 6 when the metal pipe 6 is bent, the metal pipe 6 can be prevented from being wrinkled or deformed. Further, if the metal pipe 6 is pressed by the movable presser die 11 during the bending process, the swelling of the metal pipe 6 in the vicinity of the bent part can be prevented.
[0010]
In this way, after forming the large-diameter bending portion 6a having the bending radius R1 in the metal pipe 6 as shown in FIG. 9, when forming the small-diameter bending portion 6b having the bending radius R2, the pipe retainer 9 is attached to the metal pipe. 6, the movable presser die 11 is moved away from the metal pipe 6, the moving clamp 8 is raised, and the metal pipe 6 is positioned at the height of the bending surface 4 ′ in the pipe bending die 2 ′.
[0011]
In this state, the rotating shaft 1 is rotated in the reverse direction, and the pipe bending mold 2 'is returned to the standby posture shown in FIG. Thereafter, the moving clamp 8 is moved horizontally further to the right than the position of FIG. 6C, and the portion to be bent next to the metal pipe 6 is positioned at the position of the bending surface 4 ′ of the pipe bending die 2 ′. .
[0012]
In this state, the metal pipe 6 is bent in the order shown in FIGS. 6 (A) to 6 (C) using the upper pipe bending die 2 ′, the pipe holding tool 9 ′, and the moving holding die 11 ′. A small-diameter bending portion 6b having a bending radius R2 is formed.
[0013]
[Problems to be solved by the invention]
However, in such a conventional metal pipe bending apparatus, the pipe bending molds 2 and 2 'are stacked in an up-and-down state in order to bend a plurality of portions of the same metal pipe 6 with different bending radii. Therefore, in order to adjust the height of the metal pipe 6 to the bending surfaces 4 and 4 'of the pipe bending molds 2 and 2', a lifting mechanism for moving the moving clamp 8 up and down is necessary, and the size of the apparatus is increased. There was a point.
[0014]
Further, in such a conventional metal pipe bending apparatus, when the long metal pipe 6 as shown in FIG. 10 is bent, the moving clamp 8 is separated from the pipe bending molds 2 and 2 ′. The position of the other end of the metal pipe 6 that is cantilevered at 8 is the height of the bending surfaces 4, 4 'of the target pipe bending molds 2, 2' due to natural bending of the metal pipe 6, etc. There was a problem that was difficult to match.
[0015]
An object of the present invention is to provide a metal pipe bending apparatus that can adjust the height to the bending surface of each pipe bending die having different bending radii without raising and lowering the metal pipe.
[0016]
Another object of the present invention is to provide a metal pipe bending apparatus capable of reliably rotating a rotary table supporting each pipe bending mold together with rotation of a rotary shaft.
[0017]
Another object of the present invention is to provide a metal pipe bending apparatus capable of easily moving a required one of pipe bending dies having different bending radii to a processing position.
[0018]
[Means for Solving the Problems]
In the present invention, a plurality of pipe bending dies having different bending radii are installed on a rotating shaft, and the tip end side of the metal pipe arranged in the tangential direction of the bending surface of one of the pipe bending dies is moved with a moving clamp. Hold the metal pipe bending start end to the pipe bending die with a pipe presser that is gripped and rotated in synchronization with the rotating shaft within a predetermined range, and rotate the rotating shaft to turn the metal pipe into the pipe bending die. The present invention is to improve a metal pipe bending apparatus of the type that bends along the bending surface.
[0019]
In the metal pipe bending apparatus according to the present invention, a rotary table is rotatably installed on the rotary shaft so that the rotation center coincides with the rotary axis, and a plurality of pipes having different bending radii are provided on the rotary table. The bending dies are installed at different positions in the circumferential direction around the rotation center of the rotary table.
[0020]
In such a metal pipe bending apparatus, a rotating table is rotatably installed on a rotating shaft so that the rotation center coincides with the rotation axis, and a plurality of pipe bending dies having different bending radii are placed on the rotating table. Since they are arranged at the same height at different positions in the circumferential direction, the height is uniformly adjusted to any bending surface of each pipe bending die with different bending radii without raising and lowering the metal pipe. Can do.
[0021]
For this reason, a lifting mechanism for the moving clamp is not required, and the apparatus can be miniaturized.
[0022]
In this case, it is preferable that the rotary table is selectively locked to the rotary shaft by a lock means.
[0023]
With such a structure, when the rotary shaft rotates, the rotary table can be rotated together regardless of the load.
[0024]
Moreover, it is preferable to provide the motor which rotates a turntable in the rotating shaft side.
[0025]
When such a motor is provided, the required one of the pipe bending dies having different bending radii can be easily and automatically moved to the processing position by the rotation of the motor.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 (A) to (C) show an example of an embodiment of a metal pipe bending apparatus according to the present invention.
[0027]
In the metal pipe bending apparatus of this example, the rotary table 13 is rotatably installed on the rotary shaft 1 so that the rotation center coincides with the rotation axis. Around the rotation axis on the rotary table 13, keys 14 are projected at 90 ° intervals.
[0028]
Two pipe bending dies 2 and 2 ′ having different bending radii are arranged on the turntable 13 at different positions in the circumferential direction around the rotation center of the turntable 13. By positioning the groove 15 in the key 14, it is positioned in a non-rotating state. These pipe bending molds 2 and 2 ′ are fastened and fixed by overlapping a washer 16 at the center and screwing a common bolt 3 into a screw hole 17 at the center of the rotary table 13.
[0029]
On the outer periphery of each of the pipe bending dies 2 and 2 ', the bending surfaces 4 and 4' formed of grooves along the circumferential direction are projected on the outer periphery of the pipe bending dies 2 and 2 ', and the bending surfaces 4 and 4' protrude in the tangential direction. There are provided tangential extensions 5, 5 '.
[0030]
The rotary table 13 is selectively locked to the rotary shaft 1 by lock means 18 made of, for example, a hydraulic cylinder.
[0031]
Further, the rotary table 13 is driven to rotate by a motor 19 provided on the rotary shaft 1 side when the lock means 18 is unlocked, and the position of the pipe bending molds 2 and 2 ′ is changed. It can be done.
[0032]
Other configurations are the same as those in FIG. However, in this example, the pipe presser 9 and the movable presser mold 11 are provided in only one stage, and the movable clamp 8 is configured to move horizontally and not move up and down. For this reason, the raising / lowering mechanism of the moving clamp 8 is abbreviate | omitted.
[0033]
Next, an operation for bending the metal pipe 6 by such a metal pipe bending apparatus will be described with reference to FIGS.
[0034]
As shown in FIG. 5 (A), the pipe bending die 2 having a large bending radius is kept waiting toward the processing position. In such a state, the automatic pipe feeder 7 moves the metal pipe 6 having a required length toward the movable clamp 8 at the height of the bending surface 4 of the pipe bending die 2. Supply while moving to the left. In this process, the cored bar 12 is inserted into the metal pipe 6 from the tip side.
[0035]
As shown in FIG. 5B, when the tip end side of the metal pipe 6 reaches the standby position of the moving clamp 8, the tip end side of the metal pipe 6 is clamped by the moving clamp 8. When the moving clamp 8 clamps the tip end side of the metal pipe 6 in this way, the automatic pipe feeder 7 releases the metal pipe 6 and moves back to the standby position. Therefore, in this state, the metal pipe 6 is cantilevered by the moving clamp 8.
[0036]
In this state, the movable presser die 11 moves forward and presses the metal pipe 6, and the pipe presser 9 moves forward so that the bending start end of the metal pipe 6 becomes the tangential extension 5 of the pipe bending die 2. Fix it.
[0037]
In this state, when the rotary table 13 is rotated as shown in FIG. 5C by the rotation driving means such as a motor (not shown) as shown in FIG. 5C, the pipe presser 9 is also rotated as the rotary shaft 1 rotates. At the same time, it rotates synchronously within a predetermined range, whereby the metal pipe 6 is bent along the bending surface 4 of the pipe bending die 2. At this time, since the metal pipe 6 is pulled by the amount wound around the bending surface 4, the moving clamp 8 and the moving presser mold 11 move toward the pipe bending die 2 by the amount the metal pipe 6 is pulled. If the metal core 12 is inserted into the metal pipe 6 when the metal pipe 6 is bent, the metal pipe 6 can be prevented from being wrinkled or deformed. Further, if the metal pipe 6 is pressed by the movable presser die 11 during the bending process, the swelling of the metal pipe 6 in the vicinity of the bent part can be prevented.
[0038]
In this way, after forming the large-diameter bending portion 6a having the bending radius R1 in the metal pipe 6 as shown in FIG. 9, the small-diameter bending portion 6b having the bending radius R2 is formed as shown in FIG. In this manner, the pipe presser 9 is moved backward from the metal pipe 6, and the movable presser die 11 is separated from the metal pipe 6.
[0039]
Next, the lock table 18 is unlocked by operating the lock means 18, the motor 19 is rotated and the turntable 13 is rotated, and the pipe bending die 2 'having the smaller bending radius is shown in FIG. 5 (E). To the pipe presser 9 side. When this operation is completed, the rotary table 13 is locked to the rotary shaft 1 by the operation of the lock means 18. Next, the rotating shaft 1 is reversely rotated to return the pipe bending die 2 'to the standby posture as shown in FIG. 5F, and in synchronization with this, the pipe presser 9 is also rotated by the reverse rotation of the rotating body 10. Return to the standby position.
[0040]
Thereafter, the moving clamp 8 is moved horizontally further to the right than the position shown in FIG. 5C, and the portion to be bent next to the metal pipe 6 is positioned at the bending forming surface 4 ′ of the pipe bending die 2 ′. .
[0041]
Next, as shown in FIG. 5 (F), the movable presser die 11 is moved forward to hold the metal pipe 6 and the pipe presser 9 is moved forward to move the next bending start end of the metal pipe 6 to the pipe bending metal. Fix to the tangential extension 5 'of the mold 2'.
[0042]
In this state, when the rotary table 13 is rotated as shown in FIG. 5G by a rotary drive means such as a motor (not shown) as shown in FIG. 5G, the pipe presser 9 is also rotated as the rotary shaft 1 rotates. At the same time, the metal pipe 6 is bent in accordance with the bending surface 4 'of the pipe bending mold 2' to form a small-diameter bending portion 6b having a bending radius R2.
[0043]
Thus, in the metal pipe bending apparatus of this example, the plurality of pipe bending molds 2 and 2 ′ having different bending radii are arranged at the same height on the rotary table 13, so that the metal pipe 6 is not raised or lowered. Further, the height can be uniformly matched to any of the bending surfaces 4 or 4 'of the pipe bending dies 2 and 2' having different bending radii.
[0044]
For this reason, the raising / lowering mechanism of the moving clamp 8 becomes unnecessary, and a device can be reduced in size.
[0045]
【The invention's effect】
In the metal pipe bending apparatus according to the present invention, a rotating table is rotatably installed on a rotating shaft so that the rotating center coincides with the rotating shaft, and a plurality of pipe bending dies having different bending radii are placed on the rotating table. Since they are arranged at the same height at different positions in the circumferential direction, the height is uniformly adjusted to any bending surface of each pipe bending die having different bending radii without raising and lowering the metal pipe. be able to. For this reason, according to this invention, the raising / lowering mechanism of a moving clamp becomes unnecessary and an apparatus can be reduced in size.
[0046]
Further, when the rotary table is selectively locked to the rotary shaft by the lock means, the rotary table can be rotated together regardless of the load size when the rotary shaft rotates.
[0047]
In addition, when a motor for rotating the rotary table is provided on the rotary shaft side, the required one of pipe bending dies having different bending radii can be easily moved automatically to the processing position by the rotation of the motor. it can.
[Brief description of the drawings]
FIG. 1 is a side view showing a positional relationship among a rotary shaft, a rotary table, and a pipe bending die in an example of an embodiment of a metal pipe bending apparatus according to the present invention.
FIG. 2 is a plan view showing the arrangement of two pipe bending dies having different bending radii used in this example.
FIGS. 3A and 3B are a plan view and a side view showing a relationship between a rotary shaft and a rotary table in this example. FIGS.
4A, 4B, and 4C are a plan view, a front view, and a right side view of a pipe bending mold having a large bending radius used in this example.
FIGS. 5A to 5G are operation explanatory views of the metal pipe bending apparatus according to the present embodiment.
FIGS. 6A to 6C are operation explanatory views of a conventional metal pipe bending apparatus.
FIG. 7 is a plan view showing an arrangement of two pipe bending dies having different bending radii in a conventional metal pipe bending apparatus.
FIG. 8 is a side view showing the positional relationship between two pipe bending dies having different bending radii from the rotation axis of a conventional metal pipe bending apparatus.
FIG. 9 is a plan view showing a state where two portions of a metal pipe are bent at different bending radii.
10A and 10B are a plan view and a side view showing a positional relationship between a moving clamp and two pipe bending dies having different bending radii in the case of a long metal pipe.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotating shaft 2, 2 'Pipe bending die 3 with different bending radii 3 Bolt 4, 4' Bending molding surface 5, 5 'Tangent direction extension part 6 Metal pipe 7 Pipe automatic feeder 8 Moving clamp 9, 9' Pipe presser DESCRIPTION OF SYMBOLS 10 Rotating body 11 and 11 'Movement presser type | mold 12 Core metal 13 Rotary table 14 Key 15 Key groove 16 Washer 17 Screw hole 18 Locking means 19 Motor

Claims (3)

A plurality of pipe bending dies having different bending radii are installed on the rotating shaft, and the tip end side of the metal pipe arranged in the tangential direction of the bending forming surface of any one of the pipe bending dies is gripped by a moving clamp, and The metal pipe is bent by rotating the rotary shaft in a state where the bending start end of the metal pipe is fixed to the pipe bending mold by a pipe presser that rotates in synchronization with the rotary shaft within a predetermined range. In a metal pipe bending machine that bends along the bending surface of the mold,
A rotating table is rotatably installed on the rotating shaft so that the rotating center coincides with the rotating axis, and a plurality of pipe bending dies having different bending radii are arranged on the rotating table. A metal pipe bending apparatus characterized by being installed at different positions in the circumferential direction around. The metal pipe bending apparatus according to claim 1, wherein the rotary table is selectively locked to the rotary shaft by a lock means. The metal pipe bending apparatus according to claim 1 or 2, wherein a motor for rotating the rotary table is provided on the rotary shaft side.

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