JPH08197143A - Method of correcting curved tube and method of connecting coupling body for correcting - Google Patents

Abstract

PURPOSE: To form a correcting device for a curved tube with a urethane bar, to correct the deformation of the cross section of the curved tube through the use of its bending performance and rigidity, and also to improve the connecting performance of a coupling body for correcting the curved tube made of different materials. CONSTITUTION: Bending is performed with a curved tube correcting device 3 inserted into the whole bending part of the tube, the correcting device 3 consisting of a urethane bar with nearly the same diameter as the bore of a tube to be worked for a curved tube 1; while the deformation of the cross section of the curved tube is prevented through the rigidity of the urethane bar, the urethane bar is pulled out by means of a curved tube withdrawing device 4, correcting the deformation of the curved tube. Further, a protruding part 9 with a conical tip, which is formed by rotating the arrow mark at the end of the withdrawing device, is forcedly inserted into a cavity 8 which is wider in the depth as arranged and formed at the end of the urethane bar by rotating in a projecting shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of straightening a bent pipe and a method of connecting a straightening connector.

[0002]

2. Description of the Related Art According to a conventional method for correcting a bent tube, as shown in, for example, Japanese Patent Laid-Open No. 54-157181, one end of the tube is clamped to the peripheral surface of the roll. When fixed and applying force in the direction of rotation integrally with the rotation of the roll to process it into a bent tube, a large force is applied in the direction of the roll on the outer circumference of the bent part of the bent tube, and the section of the bent part is deformed. In order to correct this, for bending pipe straightening, it consists of a bending pipe straightening device that connects and forms steel balls of approximately the same diameter as the inner diameter of the pipe with steel ropes, and a metal pulling device that pulls it out of the pipe. After inserting the connector into the pipe and processing it into a bending pipe, the bending pipe straightening connector is removed from the bending pipe with the pulling punch of the extraction device to correct the deformation of the cross section of the bending portion of the bending pipe. . In this case, a technique of forming a bent pipe straightening device by connecting a ball pipe joint is also known.

[0003]

However, in such a bent pipe straightening connection body, a ball pipe joint is connected,
Alternatively, a bending pipe straightening device having a structure in which steel balls are connected by steel ropes is required to have a large bending force so that a large force is required to pull out the pipe from the inserted pipe. Therefore, in order to facilitate the removal of the bent pipe straightening connector from the pipe after processing the bent pipe, the pipe must be bent at the portion of the pipe close to the position where the bending pipe straightening connector is inserted. However, there is a problem in that there is a restriction on work, and the ability to correct the deformation of the cross section of the curved portion of the bending tube decreases as the bending frequency increases.

Further, according to the prior art, as a method for connecting dissimilar materials, a screw-type connecting method is often used. However, a bending made of a relatively soft material such as a urethane rod is used. When a screw type connection method is used to connect the pipe straightening device and the removal device made of a material such as metal, a large force is not applied to the connection part and the urethane rod is held with the pulling punch of the removal device. There was a drawback that the connecting part would be damaged if you tried to remove it from the pipe.

[0005]

In the method of straightening a bent pipe according to the present invention, a urethane rod having a diameter substantially equal to the inner diameter of the pipe is used as a bending pipe straightening device, and the urethane rod is inserted over the entire processed portion of the pipe. It is characterized by doing.

Further, according to the method of connecting the bending-tube straightening connector according to the present invention, a wide cavity formed by rotating a convex character is formed at the connecting end of the urethane rod, and the connecting device of the extracting device is connected. It is characterized in that each of the end portions is provided with a protrusion having a conical tip formed by rotating an arrow, and the protrusion is forcibly fitted into the cavity.

[0007]

According to the prior art, in the bent pipe straightening connector of the present invention, the ball pipe joint is connected, or
A bending pipe straightening device with bending performance restricted, formed by connecting steel balls with steel rope, is formed by a rigid urethane rod that also has good bending performance. The connecting method is a deep hollow formed by rotating a convex shape at the connecting end of the urethane rod,
It is characterized in that projections with conical tips formed by rotating arrows are provided at the connection ends of the extraction device, and the projections are forcibly fitted into the cavities. By this connection method, the connection strength between a relatively soft material such as a urethane rod and the extraction device made of metal is strengthened, and the bending tube straightening performance of the bending tube straightening connection body is improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The bent pipe straightening connector of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a vertical cross-sectional side view showing an embodiment of a bent tube straightening connector according to the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is a urethane rod. FIG. 4 is a vertical sectional side view showing a method of connecting the bending pipe straightening device and the pulling-out device.
FIG. 5 is a vertical sectional side view showing another embodiment, and FIG. 5 is an enlarged cross-sectional view showing the configuration of the projecting portion of the steel ball in FIG.

1, FIG. 2, FIG. 3, FIG. 4 and FIG. 5, 1 is a pipe to be processed into a bent pipe, 2 is a curved portion of the bent pipe, 3
Is a bending pipe straightening device made of a urethane rod, 4 is a pulling device connected to the bending pipe straightening device 3, 5 is a punch of the pulling device 4,
6 is a clamp for fixing one end of the pipe 1, and 7 is a clamp.
Reference numeral 8 denotes a wide hollow formed by rotating a convex shape at the connecting end of the bending tube straightening device 3 made of a urethane rod, and 9 indicates an arrow at the connecting end of the extracting device 4. The formed projection has a conical tip, 10 is a steel ball, 11 is a conical tip of the projection 9, 12 is a handle of the projection 9, and 13 is a pin connecting 11 and 12.

As shown in FIG. 1, a bending pipe straightening device 3 made of a urethane rod having a diameter substantially equal to the inner diameter of the pipe 1 is attached to the pipe 1.
Of the bending pipe, and one end of the pipe is fixed in contact with the peripheral surface of the roll 7 by the clamp 6 and is indicated by an arrow together with the rotation of the roll 7. A force is applied in the direction of rotation to process the tube 1 into a bent tube.

The bending portion 2 of the tube 1 processed into a bending tube is a bending tube straightening device 3 made of a urethane rod having good bending performance.
Are formed so as to be inserted over the entire portion of the pipe 1 to be processed into a bent pipe. In this case, a force is applied to the outer periphery of the bending portion 2 of the bending tube in the direction of the roll 7 so as to deform the cross section of the bending portion 2, but the bending portion 2 is inserted due to the rigidity of the urethane rod inserted in the tube. The deformation of the cross section is prevented.

From the tube processed into the bent tube, the bending tube straightening device 3 made of a urethane rod is removed from the other end of the tube 1 fixed to the clamp 6 by the pulling punch 5 of the removing device 4. By doing so, it is possible to further improve the performance of correcting the deformation in the cross section of the bending portion 2 of the bending tube by the bending tube correcting device 3.

According to the present invention, when urethane and dissimilar materials such as metal are connected, a bent pipe with improved connection performance can be connected without damage even if a large force is applied to the connection ends. In order to provide a straightening connector, the bending tube straightening device 3 and its removal device 4 are connected to each other by forming a convex shape on the connecting end of the bending pipe straightening device 3 made of a urethane rod. A hollow cavity 8 and a projection 9 having a conical tip formed by rotating an arrow at the connecting end of the extracting device 4 to forcefully project the projection 9. It is characterized in that it is inserted into the cavity 8.

According to another embodiment, the steel ball 10 is connected to the other end of the end of the urethane rod connected to the removing device 4 by using the connecting method of the present invention. Then
It is also possible to form a bent tube straightening device composed of a urethane rod and a steel ball. In this case, the projection having a conical tip formed on the steel ball 10 is divided into a tip portion 11 and a handle portion 12, which are connected by a pin 13 to form them, as shown in FIG. As described above, the tip end portion 11 of the protruding portion of the steel ball 10 is arranged so that the bending performance in the pipe 1 is improved. The bending pipe straightening device including the urethane rod and the steel ball 10 connected by such a connecting method is broken even if a large force is applied to each connecting end portion of the urethane rod and the steel ball as described above. Bending tube straightening performance with high accuracy can be obtained.

[0016]

As described above, according to the present invention, the bent pipe straightening device 3 is formed of a urethane rod having the same diameter as the inner diameter of the pipe 1 and having good bending performance, and the pipe 1 is processed into a bent pipe. When the bending process is performed while the bending pipe straightening device 3 is inserted into the pipe 1 as a whole, the cross section of the bending portion 2 is deformed in the direction of the roll 7 on the outer circumference of the bending portion 2 of the bending pipe. Although a force is applied, it is possible to prevent the cross section of the curved portion 2 from being deformed due to the rigidity of the urethane rod inserted in the tube. Further, the bending pipe straightening device 3 made of a urethane rod is pulled out from the other end of the pipe 1 fixed to the clamp 6 by the pulling punch 5 of the pulling device 4 from the pipe that has been processed into the bending pipe. As a result, it is possible to further improve the performance of correcting the deformation in the cross section of the bending portion 2 of the bending tube by the bending tube correcting device 3. In this case, a hollow cavity 8 formed by rotating a convex character is formed at the connecting end of the urethane rod,
For bending pipe straightening, the projections 9 having conical tips formed by rotating the arrows are arranged at the connection ends of the extraction device 4 and the projections 9 are forcibly inserted into the cavities 8. Depending on the connecting method of the connecting body, the connecting performance of the bent tube straightening connecting body made of different materials is improved.

[Brief description of drawings]

In the drawings, FIG. 1 is a vertical sectional side view showing an embodiment of the present invention, FIG. 2 is a sectional view of a portion AA of FIG. 1, and FIG.
FIG. 4 is a vertical cross-sectional side view showing a method of connecting the bending pipe straightening device and the removal device thereof, FIG. 4 is a vertical cross-sectional side view showing another embodiment, and FIG. FIG. 6 and FIG. 7 are vertical cross-sectional views of a bent pipe straightening connector according to the related art. In the drawing, 1 is a pipe, 2 is a bent portion of a bent pipe, 3 is a bending pipe straightening device, 4 is a pulling device, 5 is a punch of the pulling device 4, 6 is a clamp, 7 is a roll, and 8 is a roll. Cavity of the bending pipe straightening device 3, 9 is a protrusion of the extracting device 4, 10 is a steel ball,
11 and 12 are the tip portion of the steel ball protrusion and the handle portion, 1
3 is a pin, 14 is a ball pipe joint, and 15 is a steel rope.

Claims (2)

[Claims] 1. A bending pipe straightening device formed by connecting a ball pipe joint or a steel ball by a steel rope inside a pipe to be processed into a bending pipe, and a pulling-out device connected to the bending pipe straightening device. Insert the bending tube straightening connector consisting of the device and fix one end of the tube in contact with the peripheral surface of the roll with a clamp, and rotate in the same direction as the rotation of the roll. After applying force to the tube to make it into a bent tube, with the pulling punch of the withdrawal device, remove the connector from the other end of this tube to correct the deformation of the curved section of the bent tube. In the method, a urethane rod having a diameter substantially equal to the inner diameter of the pipe is formed as a bending pipe straightening device, and the urethane rod is inserted over the entire portion of the pipe to be processed into the bending pipe. . 2. An arrow is rotated at the connecting end of the urethane rod forming the connecting body to form a wide cavity formed by rotating a convex shape, and at the connecting end of the extraction device. The method of connecting a bending-tube-correcting connector according to claim 1, wherein each of the formed projections has a conical tip, and the projections are forcibly fitted into the cavity.