JP2624098B2 - Pipe bending equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe bending apparatus for bending a workpiece such as a steel pipe.

[0002]

2. Description of the Related Art FIG. 5 illustrates a procedure for carrying out a conventional method of drawing and bending a pipe material. In FIG. 5, reference numeral 11 denotes a work material such as a pipe material to be subjected to bending and bending processing; Is a chuck for attaching and supporting the workpiece 11 around the rotary roll 12, and 14 is a holding roller 15 inside.
It is a guide holding.

[0003] The procedure of the method for drawing and bending a pipe material configured as described above is as follows. First, in the state shown in FIG.
When the rotating roll 12 with the attached 11 is rotated in the direction a, the chuck 13 is pressed against the rotating roll 12 via the workpiece 11 so that the rotating roll 12 is turned 90 ° from the state shown in FIG. When it is rotated, as shown in FIG. 3B, the chuck 13 moves by the same amount as the rotation amount of the rotating roll 12, and at the same time, the workpiece 11 is rotated by a length proportional to the rotation amount. 12 is pulled out in the direction of rotation.

At this time, the workpiece 11 is pulled out while sliding in the guide 14, but the pressing roller is pressed so as not to be pulled out more than a length proportional to the rotation amount of the rotating roll 12.
The work material is appropriately pressed by 15.

[0005] Then, the rotating roll 12 is further rotated by 90 °.
Rotate (180 ° from the state shown in FIG.
As shown in FIG. 3C, the workpiece 11 is bent almost symmetrically between the guide 14 and the chuck 13 as shown in FIG.

Finally, when the guide provided on the workpiece 11 via the chuck 13 and the pressing roller 15 fixed to the workpiece 11 is detached from the workpiece 11, As shown in FIG. 4D, the workpiece 11 is slightly spring-backed except for the curved portion.
They are almost parallel.

However, in the above-mentioned method of drawing and bending a pipe material, a roll having a specific diameter is required for each bending diameter R of the pipe material to be processed, so that the number of stock rolls increases and the fixed cost increases. Is expensive.

[0008] In addition, the setup change requires time and effort, and not only is the workability inferior, but also the force applied to the pressing roller in the guide largely depends on the experience of a skilled worker, and is suitable for the material diameter. There is also an inconvenience that the operation is complicated, for example, a pressing roller is required.

An apparatus disclosed in Japanese Patent Application Laid-Open No. 62-187524 is an example of a pipe bending apparatus for solving the above-mentioned disadvantages. The tube bending apparatus disclosed in the publication includes, for example, as shown in FIG. 6, rotation driving devices 1 a and 1 b that rotate in opposite directions, and these rotation driving devices 1 a and 1 b include: Each is provided with rollers 2a, 2b and 3a, 3b having an outer peripheral shape conforming to the diameter shape of the workpiece A such as a pipe, and the workpiece A is inserted and supported between these rollers 2a, 2b and 3a, 3b. By rotating and driving the rotary drive devices 1a and 1b, the bending and bending of the workpiece A is performed.

[0010]

However, due to the difference in frictional resistance between the roller and the workpiece and the difference in the resistance of the rotating portion of the roller itself, as shown in FIG.
The inconvenience of the point where the portion jumps forward from the position shown by the dotted line to the position shown by the solid line and the occurrence of a foot displacement L cannot be avoided, and the bending accuracy is inferior.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to prevent a bent R portion from protruding forward and preventing a foot from being displaced during bending and bending a workpiece such as a pipe. Accordingly, it is an object of the present invention to provide a pipe bending apparatus capable of improving bending accuracy.

[0012]

In order to achieve the above object, a tube bending apparatus according to the present invention comprises a pair of rotary driving devices which are arranged at predetermined intervals and rotate in directions opposite to each other. Each of the rotary driving devices includes two rollers arranged opposite to each other and having a shape conforming to the diameter of the workpiece, inserts and supports the workpiece between these rollers, and drives the rotary driving device to rotate. Accordingly, in the tube bending apparatus configured to bend and bend the workpiece, the same rotational driving is performed to apply a constant bending stress to the back side of the workpiece inserted and supported between the rotary driving devices. A band-shaped metal piece that is placed and supported between the spindles provided for each device and attached to the above-mentioned workpiece, and both ends of the workpiece are chucked, and the workpiece is pressed while being pressed in the axial direction. Clan that sends out materials A mechanism is characterized by comprising a servo mechanism for synchronously driving the feed speed of the workpiece by the rotating speed and the clamping device of the rotary drive device.

[0013]

According to the present invention, when each of the rotary driving devices rotates in directions opposite to each other, between the two rollers disposed opposite to each other in a shape corresponding to the diameter of the workpiece in each rotary driving device. The work material inserted and supported in is bent by the rotation of the roller accompanying the rotation of the rotation drive device,
Although it is curved to a predetermined R diameter, at this time, a band-shaped metal member is arranged and supported on the R portion of the work material so as to be along the back side of the work material. Since a constant pressure is applied to the opposite side of the workpiece, the bending stress due to the rotational drive of each of the rotary driving devices is uniformly applied to the workpiece.

As described above, a uniform bending stress is applied to the bent R portion of the workpiece by the band-shaped metal, so that the bent R portion is prevented from protruding forward.

Further, since the feed speed of the workpiece by the clamp device and the rotation speed by the rotary drive device are synchronously driven by the servo mechanism, it is possible to prevent the occurrence of the displacement of the foot of the workpiece. Therefore, the bending accuracy is improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1 to 3 are diagrams for explaining a bending procedure using a pipe bending apparatus according to one embodiment of the present invention. FIG. FIG. 2 is a view showing a set state, FIG. 2 is a view showing an intermediate stage of bending, and FIG. 3 is a view showing a state at the time of completion of bending.

In these drawings, reference numerals 1a and 1b denote a pair of rotary driving devices which are arranged at a predetermined interval and rotate in directions opposite to each other, and transmit a transmission force from a motor (not shown) to the axis thereof. It is transmitted and rotates at a predetermined speed.

Two rollers 2a, 2b (3a, 3b) each having an outer peripheral shape corresponding to the diameter of the workpiece A are arranged opposite to each other in the rotary driving device 1a (1b). The workpiece A to be subjected to the bending and bending process is inserted and supported between 2b (3a, 3b).

4a and 4b are rotary drive devices 1a
The workpiece A inserted and supported between the rollers 2a, 2b (3a, 3b) of (1b) is rotated by the rotation drive device 1a (1b).
This is a clamp device for chucking and feeding the workpiece while pressing it in the axial direction from the outside of the workpiece, and the clamp device 4a (4b) receives the workpiece at a feed speed v as shown in FIG. The processing material A is set so that it can be sent out.

Reference numeral 5 denotes a band-shaped metal member having a constant pressure applied to the back side of the workpiece, which is provided between the support shafts 6a and 6b provided on the respective rotary driving devices 1a and 1b. The workpiece A is arranged and supported along the rear surface of the material A, and is deformed in the attached state on the rear surface side with the deformation of the workpiece A due to the rotational drive of each of the rotation driving devices 1a and 1b. .

The above-mentioned bending apparatus is driven by a driving system as shown in FIG. That is, in FIG. 4, the rotary driving devices 1a and 1b
Are rotated by motors M ₁ and M ₂ , respectively, and these motors M ₁ and M ₂ are controlled by a hydraulic servo amplifier 7 while satisfying the expression X = Rθ, And is driven synchronously.

The clamping devices 4a and 4b are driven by motors M _A and M _B , respectively, and are synchronously driven by the hydraulic servo amplifier 7 with the rotary driving devices 1a and 1b while satisfying the equation X = Rθ. It is supposed to.

In the above equation X = Rθ, X is the feed speed, R is the bending radius, and θ is the rotation angle.

Next, the operation of the above configuration will be described. In the bending apparatus shown in FIG. 1, the workpiece A whose both ends are chucked is placed on the rotary drive devices 1a and 1b when the rotary drive devices 1a and 1b rotate in directions opposite to each other (arrow directions). Rollers 2a and 2b arranged opposite to each other,
And the rollers 3a and 3b, respectively,
It moves in the rotation direction of a or 1b.

With the rotation of the rotary driving devices 1a and 1b, the band-shaped metal member attached to the rear side of the R portion of the workpiece A also attaches to the workpiece A due to the bending deformation of the workpiece A. Follow while dressing.

As shown in FIG. 3, when the rotation driving devices 1a and 1b are further rotated, the workpiece A is bent to a predetermined R value bending angle.

At this time, a band-shaped metal member is always attached to the workpiece A so as to act to prevent the bend R portion from jumping forward, and to reduce the rotational speed of the rotary drive device. Since the feed speed of the workpiece by the clamp device is also driven synchronously by the servo mechanism, so-called foot displacement does not occur.

[0028]

As described above, according to the pipe bending apparatus of the present invention, it is possible to prevent the pipe material to be processed from jumping out to the front of the R portion, which is a bent portion, when bending and bending the tube material. It is possible to prevent the occurrence of displacement of the foot portion of the workpiece, and there is an effect that work efficiency and yield are remarkably improved in a state where bending accuracy is good.

[Brief description of the drawings]

FIG. 1 is a view showing a pipe bending apparatus according to an embodiment of the present invention, showing a state in which a workpiece is set in the bending apparatus before bending.

FIG. 2 is a view showing an apparatus for bending a pipe according to an embodiment of the present invention, showing an intermediate stage of bending.

FIG. 3 is a view showing a pipe bending apparatus according to an embodiment of the present invention, showing a state at the time of completion of bending.

FIG. 4 is a block diagram for explaining a drive system of the pipe bending apparatus according to the present invention.

FIG. 5 is a view for explaining a procedure for implementing a conventional pipe bending method.

FIG. 6 is a view for explaining inconveniences of a conventional bending apparatus.

[Explanation of symbols]

 1a, 1b Rotary drive 2a, 2b, 3a, 3b Roller 4 Clamping device 5 Strip metal

Claims (1)

(57) [Claims] 1. A rotary drive device, which is disposed at a predetermined interval and rotates in directions opposite to each other, is disposed in opposition to each of the rotary drive devices in a shape conforming to a diameter shape of a workpiece. In the tube bending apparatus for a tube material configured to be capable of bending and bending a workpiece by inserting and supporting the workpiece between these rollers and driving the rotation drive device to rotate between the rollers, In order to apply a certain bending stress to the back side of the workpiece inserted and supported between the rotary drive units, the workpiece is placed between the spindles provided for each rotary drive unit and arranged so as to be attached to the workpiece. A clamp mechanism that chucks the mounted and supported metal strip and both ends of the workpiece, and pushes out the workpiece while pressing in the axial direction, and the rotation speed of the rotary drive device and the feeding of the workpiece by the clamping device. Sync speed A bending apparatus for a pipe material, comprising: a servo mechanism for driving.