JPS6059055B2 - Bending equipment for pipes, etc. - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for bending pipes, etc., and more specifically, during pipe bending, the workpiece is restrained by the outer peripheral rolls of the pipe, etc., causing buckling and unevenness. This relates to a device that performs bending processing.

Generally, when bending a tapered pipe, the curved part of the pipe (
(especially common in objects with small curvature) is bending.

It is molded by processing. For example, lighting poles (taper degree 11100) and telephone poles (taper degree l)
Tapered pipes such as '75) are made by shearing a steel plate material into, for example, a trapezoid, then forming it into a pipe shape by press working, and then welding the seams. Combine to create a tapered straight tube. Thereafter, the tapered end of the pipe is fixed to a bending jig, and the tapered end of the pipe is bent while being inscribed in the jig, or the jig itself is rotated for bending. However, in any of these processes, the pipe is bent while being inscribed in the jig, which poses the following problems. (1) A countless number of inscribed jigs corresponding to the curved shape of the tapered pipe are required, which is extremely uneconomical.

(2) Buckling and unevenness occur on the outer circumference of the pipe during bending,
This will impede quality assurance.

(3) Productivity is poor, a large number of jigs are required, and costs are high.

The present invention aims to solve the above-mentioned drawbacks, and specifically proposes an apparatus for bending pipes, etc., which can form bent pipe sections of excellent quality by means that are highly productive and economical.

That is, in the present invention, the tip of a pipe or the like of the workpiece is inserted between an inner roll and an outer roll, a pinion gear is attached to the inner roll, and a rack is meshed with the pinion gear. The rack is configured to rotate the inner peripheral roll by moving up and down, one end of the bending arm is slidably attached to the rack, and a fixture is provided at the other end of the bending arm to attach a pipe, etc. It is characterized by being slid along a sliding locus of a guide locus regulated by the bending shape of the bending arm, and further being slidably supported between one end and the other end of the bending arm.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a front view of a bending device according to one embodiment of the present invention, and according to this device, a vibrator 3 of a workpiece is
The tip of the holder is bent into an arc, an ellipse, or a parabola with a predetermined radius of curvature.

That is, in FIG. 1, reference numeral 1 indicates an inner circumferential roll, and numeral 2 indicates an outer circumferential roll. The inner circumferential roll 1 is fixed on a base, and the outer circumferential roll 2 is opposed to the inner circumferential roll 1. Inner roll 1
A groove 1c is formed in the outer roll 2, and a groove 2c is formed in the outer peripheral roll 2 (see FIG. 2). The outer circumferential roll 2 presses downward toward the inner circumferential roll 1, and this pressing force is usually applied by a hydraulic cylinder, and the groove 2c of the outer circumferential roll 2 can also be formed in a spiral shape as shown in FIG. A pinion gear 4 is connected to the inner roll 1, a rack 5 is meshed with the pinion gear 4, and a cylinder 6 is connected to the rack 5. When the drive mechanism for the inner roll 1 is configured in this way, the rack 5 is driven by the raising and lowering of the cylinder 6, and the inner roll 1 is rotated by this rack-pinion mechanism. The outer peripheral roll 2 is the sixth
As shown in the figure, it is supported around the shaft 2a via a sleeve 2b, and the outer peripheral roll 2 rotates around the shaft 2a, and the outer peripheral roll 2 slides in the direction of the shaft 2a. In the drive mechanism for the inner roll 1, a bending arm 9 is slidably connected to a portion of the rack 5 adjacent to the cylinder 6 via a pin 8. A fixing pin 10 is installed approximately in the center of the bending arm 9, and the fixing pin 10 is attached to the guide 11 as shown in FIG.
The fixing pin 10 engages with the long groove of the guide 11 as described later.
It is constructed so that it can be slid horizontally along the long groove of.
Further, one end of the bending arm 9 is slidably connected to the rack 5, and the other end of the bending arm 9 is connected to the rack 5, as shown in FIG. Attach the fixture 12 rotatably, attach the vibrator 3 by the fixture 12,
The fixture 12 has a guide track 1 that matches the bending shape of the vibrator 3.
3 to bend the vibrator 3. The guide track 13 is configured so that the fixture 12 can slide along this track. However, as shown in FIG.
align within. As shown in FIG. 7, the guide track 13 is constructed so that the sliding rod 12a can slide thereon, and a predetermined guide track 13 is set in this portion in accordance with the bent shape of the vibrator 3. The operation of the present invention will be explained below through the use of the bending device having the above configuration.

First, prior to bending, the tip of the vibrator 3 of the workpiece is inserted between the groove 1c of the inner roll 1 and the groove 2c of the outer roll 2, and the other end of the vibrator 3 is rotatably attached to the bending arm 9. It is attached to a fixture 12 that is attached to.

Next, the cylinder 6 is raised in the direction of the arrow in FIG. 1, and the inner roll 1 is rotated in the counterclockwise direction, that is, in the direction of the arrow A.

This rotation pushes out the vibrator 3 between the inner circumferential roll 1 and the outer circumferential roll 2 in the direction of arrow B, and this extrusion causes the fixture 12 to slide along the guide track 13 in the direction of arrow C. This sliding movement causes the bending arm 9 to
0 as a fulcrum, but the fixed pin 10 is rotated around the guide 11.
The bending arm 9 slides in the direction of the arrow along the long groove of the first
The tip of the vibrator 3 is forcibly bent from the solid line state to the dotted line position while reaching the dotted line position in the figure and from the solid line position to the dotted line position. In addition, in the guide track 13, the fixture 12
The sliding locus is configured according to the bending shape of the vibrator 3, but the sliding locus can be determined as follows.

First, a vibrator bent into a desired shape is prepared in advance as a standard vibrator, and the bent portion of the tip of the standard vibrator is inserted between the inner circumferential roll 1 and the outer circumferential roll 2. Mark the position where the standard vibrator fixture 12 should be attached,
By rotating the inner roll 1 in the counterclockwise direction, the standard vibrator is sent out in the direction of arrow B. At this time, the locus of movement of the standard vibrator's fixture mounting position is determined. However, if this movement locus is directly used as the sliding locus of the guide track 13, the bending will return slightly after the bending process due to springback. For this reason,
Considering the spring allowance from experience for the obtained movement trajectory, the curvature is slightly reduced by this amount, and the guide trajectory 13
Determine the sliding trajectory. As explained above, the present invention drives the inner roll of a pair of inner and outer rolls into which the tip of the vibrator is inserted using a pinion-rack mechanism, and one end of the bending arm is slidably attached to the rack of this mechanism. With,
The vibrator is supported by a fixture at the other end of the bending arm, and this fixture is slid along a guide trajectory regulated by the bending shape of the vibrator, and is further slid between one end and the other end of the bending arm. It can be freely supported.

Therefore, during bending of the vibrator, the outer periphery of the vibrator is restrained by the outer peripheral roll, so that buckling and unevenness do not occur during the bending process.

In addition, the part that is restrained by the outer peripheral roll forms the fulcrum of the bending moment during bending, and the vibrator is constantly pressed between both rolls and fed out in the tangential direction, so the restraint from the outer circumference of the vibrator is reduced. It's extremely smooth. In addition, since the bending process is performed by following the guide track, there is less variation in the curved part, and even if the number of rods increases,
All products have the same shape, ensuring quality.

In addition, even if the curved shape of the bent pipe section changes, it is sufficient to simply replace the guide track, and the outer peripheral roll slides in the axial direction, and the concave groove is spirally directed from the large diameter to the small diameter. If the rollers are continuous, the outer peripheral roll itself can be constructed with a small diameter.

[Brief explanation of drawings]

Fig. 1 is a layout diagram of a bending device according to one embodiment of the present invention, Fig. 2 is a side view of the inner and outer peripheral roll portions, and Fig. 3 is an explanation of the positional relationship between the outer peripheral roll and the vibrator of the workpiece. Figure 4 is a sectional view of the central support part of the bending arm, Figure 5 is a sectional view of an example of the fixture, Figure 6 is a sectional view of an example of the outer peripheral roll, and Figure 7 is a constant perspective view of the guide track. There is a diagram. Code, 1...Inner circumference roll, 2...Outer circumference roll, 2a...Shaft, 2b...Sleeve, 2
c...groove, 3...vibrator of workpiece material, 4...
...Pinion gear, 5...Rack, 6...
...Cylinder, 8...Pin, 9...Arm, 10...Fixing pin, 11...Guide, 12...Fixing tool , 13...Guidance trajectory.

Claims (1)

[Claims] 1 The tip of the pipe, etc. of the workpiece is inserted between the inner circumferential roll and the outer circumferential roll, and a pinion gear is attached to this inner circumferential roll, while a rack is engaged with the pinion gear, and the inner circumferential roll is moved up and down by the raising and lowering of this rack. One end of the bending arm is slidably attached to the rack, and a fixture for attaching a pipe, etc. to the other end of the bending arm is provided, and the fixture is configured to control the bending shape of the pipe, etc. What is claimed is: 1. A bending device for a pipe or the like, characterized in that the device is configured to slide along a sliding trajectory of a guide trajectory, and is further slidably supported between one end and the other end of a bending arm.