JP2701009B2 - Bending tube straightening method and straightening connector connecting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art According to a conventional bending pipe straightening method, for example, as shown in Japanese Patent Application Laid-Open No. Sho 54-157181, one end of a pipe is fixed to a peripheral surface of a roll by a clamp. In order to correct that the cross section of the curved portion is deformed by applying a large force in the direction of the roll on the outer periphery of the curved portion of the bent tube when applying a force in the direction of the rotation integrally with the rotation of the roll to process the bent tube. A straightening device for bending pipes consisting of a bending pipe straightening device formed by connecting steel balls of approximately the same diameter as the inner diameter of the pipe with steel cords and a metal pulling-out device for pulling it out of the pipe is inserted into the pipe. After the bending pipe was processed, the bent pipe straightening connector was pulled out of the bent pipe with a pulling punch of a pull-out device to correct the deformation of the cross section of the curved portion of the bent pipe. In this case, a technique for forming a bent pipe straightening device by connecting a ball pipe joint is also known.

[0003]

However, in such a bent pipe straightening connector, a ball pipe joint is connected,
Alternatively, a bending tube straightening device having a structure in which steel balls are connected by steel cords is limited in bending performance, and it is necessary to apply a large force to withdraw from an inserted tube. Therefore, in order to make it easy to remove the bent pipe straightening connector from the pipe after forming it into a bent pipe, the pipe must be bent at a portion of the pipe close to the position where the bent pipe straightening connector is inserted. However, there is a drawback that the ability to correct the cross-sectional deformation of the curved portion of the bending tube decreases as the bending degree increases.

According to the prior art, a method of connecting different kinds of materials by screwing is often used, but a bending method 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 portion, and the urethane rod is held by the pulling punch of the removal device. There is a drawback that the connecting portion is damaged when trying to withdraw from the tube.

[0005]

A method for correcting a bent pipe according to the present invention uses a urethane rod having a diameter substantially equal to the inner diameter of the pipe as a bending pipe straightening device, and inserts the urethane rod over the entire processing portion of the pipe. It is characterized by doing.

Further, according to the present invention, there is provided a method for connecting a bent pipe straightening connector, comprising: a connecting portion of a urethane rod; At the end, a projection formed by rotating an arrow and having a conical tip is provided, and the projection is inserted into the cavity .

[0007]

According to the prior art, the joint for correcting a bent pipe according to the present invention connects a ball pipe joint or
A bending pipe straightening device in which bending performance is restricted, formed by connecting steel balls with steel cables, is formed by a rigid urethane rod body having good bending performance, and a urethane rod body and a removal device. In the connection method, at the connection end of the urethane rod, a wide cavity formed by rotating the convex shape,
At the connecting end of the removal device, a conical projection formed by rotating the arrow is provided, and the projection is hollowed out.
It is characterized by being inserted . With this connection method,
The connection strength between a relatively soft material such as a urethane rod and a pull-out device made of metal is enhanced, and the bending pipe straightening performance of the bent pipe straightening connector is improved.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a joint for correcting a bent pipe according to the present invention;

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

1, 2, 3, 4 and 5, reference numeral 1 denotes a pipe to be processed into a bent pipe, 2 denotes a bent portion of the bent pipe, 3
Is a bending tube straightening device made of a urethane rod, 4 is a pull-out device connected to the bending tube straightening device 3, 5 is a drawing punch of the pull-out device 4,
Reference numeral 6 denotes a clamp for fixing one end of the tube 1, reference numeral 7 denotes a roll, reference numeral 8 denotes a connection end of the bending pipe straightening device 3 formed of a urethane rod, and a wide cavity formed by rotating a convex shape. Reference numeral 9 denotes a projection having a conical tip formed by rotating an arrow at the connection end of the removal device 4, 10 denotes a steel ball, 11 denotes a conical tip of the projection 9, and 12 denotes a projection of the projection 9. A handle portion 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 substantially the same diameter as the inside diameter of the pipe 1 is connected to the pipe 1.
Of the pipe, and one end of the pipe is fixed in contact with the peripheral surface of the roll 7 by the clamp 6, and a force is applied in the rotation direction indicated by the arrow together with the rotation of the roll 7. To process the pipe 1 into a bent pipe.

The bent portion 2 of the tube 1 formed into a bent tube has a bent tube straightening device 3 made of a urethane rod having good bending performance.
Is 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 at the outer periphery of the curved portion 2 of the bending tube in the direction of the roll 7 with the deformation of the cross section of the curved portion 2. Is prevented from being deformed.

A bending pipe straightening device 3 made of a urethane rod is pulled out of the pipe processed into a bent pipe from the other end of the pipe 1 fixed to a clamp 6 by a pulling punch 5 of a pulling out device 4. By doing so, the performance of correcting the deformation in the cross section of the bending portion 2 of the bending pipe by the bending pipe correction device 3 can be further improved.

According to the present invention, when urethane and a different kind of material such as a metal are connected to each other, a bent pipe having an improved connection performance can be connected without being damaged even when a large force is applied to the connection ends thereof. In order to provide a straightening connector, a method of connecting the bending tube straightening device 3 and the removal device 4 thereof is formed by rotating a convex shape at the connecting end of the bending tube straightening device 3 made of a urethane rod. that the cavity 8 of OkuHiro, also the connecting end of the pull-out device 4, the tip is formed by rotating the arrow a conical protrusions 9, arranged respectively, the protrusion
9 is inserted into the cavity 8 .

According to another embodiment, the steel ball 10 is connected to the other end of the urethane rod to be connected to the pull-out device 4 by using the connecting method of the connecting body according to the present invention. And
It is also possible to form a bending tube straightening device comprising a urethane rod and a steel ball. In this case, the protruding portion having a conical tip formed on the steel ball 10 is divided into a tip portion 11 and a handle portion 12, and these are connected by pins 13 to form, as shown in FIG. As described above, the bending performance of the distal end portion 11 of the projection of the steel ball 10 in the pipe 1 is improved. The bending tube straightening device including the urethane rod and the steel ball 10 connected by such a connection method is broken even when a large force is applied to each connection end of the urethane rod and the steel ball as described above. A high-precision bending pipe straightening performance can be obtained without any problem.

[0016]

As described above, according to the present invention, the bent pipe straightening device 3 is formed of a urethane rod having a bending performance substantially equal to the inner diameter of the pipe 1 and the pipe 1 is formed into a bent pipe. When the bending process is performed while the bending pipe straightening device 3 is inserted into the pipe 1 over the entirety, a force that causes deformation of the cross section of the bending section 2 in the direction of the roll 7 on the outer circumference of the bending section 2 of the bending pipe. In addition, deformation of the cross section of the curved portion 2 can be prevented by the rigidity of the urethane rod inserted into the pipe. 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-out device 4 from the bent pipe. Thereby, the performance of correcting the deformation in the cross section of the bending portion 2 of the bending pipe by the bending pipe correction device 3 can be further improved. In this case, at the connection end of the urethane rod, a wide cavity 8 formed by rotating a convex shape,
The connecting end of the pull-out device 4, a protrusion 9 tip conical formed by rotating the arrow, arranged respectively, the projections 9
According to the method of connecting the bent pipe straightening connector to be inserted into the cavity 8, the connection performance of the bent pipe straightening connector made of different kinds of materials is improved.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings, FIG. 1 is a longitudinal sectional side view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along a line AA in FIG. 1, and FIG. FIG. 4 is a vertical sectional side view showing another embodiment, and FIG. 5 is an enlarged sectional view showing the configuration of a conical projection of a steel ball; FIGS. 6 and 7. 1 is a longitudinal sectional view of a bent pipe straightening connector according to a conventional technique. In the figure, 1 is a pipe, 2 is a bent portion of a bent pipe, 3 is a bent pipe straightening device, 4 is a pull-out device, 5 is a punch of the pull-out device 4, 6 is a clamp, 7 is a roll, and 8 is a bent pipe. The cavity of the straightening device 3, 9 is the protrusion of the removal device 4, 10 is the steel ball, 11 and 12 are the tip and handle portions of the steel ball protrusion, 13 is the pin, 14 is the ball pipe joint, and 15 is the steel cable. It is.

Claims (2)

(57) [Claims] A bent pipe straightening process is performed inside a bent pipe.
A bending pipe straightening connector consisting of a main device and a pull-out device connected to the device is inserted, and one end of the pipe is fixed in contact with the peripheral surface of the roll with a clamp, and the roll is rotated. After processing the pipe into a bent pipe by applying force in the direction of its rotation,
In a method of correcting the cross-sectional deformation of a curved portion of a bent tube by pulling out a connecting body from the other end of the tube with a pulling punch of a pulling device, urethane having a diameter substantially equal to the inner diameter of the tube is used. A method for straightening a bent pipe, wherein the rod is formed as a bent pipe straightening device, and a urethane rod is inserted and inserted over the entire portion of the pipe to be processed into a bent pipe. 2. At the connection end of the urethane rod body constituting the connection body, a wide cavity formed by rotating a convex shape, and at the connection end of the extraction device, by rotating an arrow. The formed tip has a conical protrusion, and the protrusion is hollow.
The connecting method for a bent pipe straightening connector according to claim 1, wherein the connecting member is inserted into a bent pipe.