JP2003211229A - Double pipe bending apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the pushing of a double pipe without using a complicated mechanism. <P>SOLUTION: A double pipe bending apparatus includes a processing mechanism, a double pipe pushing mechanism having a chuck mechanism and a carriage, and an apparatus main body provided with a rail and a frame. The double pipe pushing mechanism is provided with an outer core bar 14 arranged between inside and outside pipes, an inner core bar arranged inside an inner pipe 2a, a slide rod 45 arranged at a rear end part of the inner core bar 43, a core bar shaft 47 arranged between the slide rod and the frame, a slide ring 49 which is arranged on the slide rod and contact with an end of the inner pipe, and a pushing lug 51 which is arranged on the slide rod and contact with an end of an external pipe 2b. The pushing lug is held by the chuck mechanism when pressured, moved on the apparatus main body by the carriage, and presses the ends of the inside and outside pipes toward a bending mechanism. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double pipe bending apparatus used for, for example, automobile exhaust pipes, heat insulating pipes and the like.

[0002]

2. Description of the Related Art Conventionally, as a double-pipe bending apparatus of this type, for example, a double-pipe bending method and its apparatus disclosed in Japanese Patent Laid-Open No. 10-118719 are known. As shown in FIGS. 4 and 5, this type of double pipe bending apparatus 1 includes a bending mechanism 3 for bending a double pipe 2 including an inner pipe 2a and an outer pipe 2b, and this bending mechanism. Double tube pushing mechanism 6 for sending the double tube 2 to 3,
It is composed of two rails 15 for moving the carriage 13 of the double tube pushing mechanism 6 and an apparatus main body 14 provided with a pedestal 11 for receiving the reaction force of the double tube 2 at the time of pressing.

As shown in FIG. 4, the bending mechanism 3 holds a tip portion 2A of a double pipe 2 by a rotatable bending die 4 and a tightening die 5 which can revolve around the bending die 4. The clamping die 5 is revolved to bend the double pipe 2. As shown in FIGS. 4 and 5, the double pipe pushing mechanism 6 includes three claws (two of which are shown in the drawings) for holding the rear end portion 2b1 of the outer pipe 2b of the double pipe 2. 7a, a chuck mechanism 7, an outer core metal 8 through which the chuck mechanism 7 is inserted, an inner core metal 9 disposed inside the outer core metal 8, and a rear end portion of the inner core metal 9. The core shaft 10 supported by the gantry 11, the inner tube pressing jig 12 arranged inside the chuck mechanism 7, and the carriage 1 for pressing the chuck mechanism 7 toward the bending mechanism 3
3, a shaft 16 for externally fitting the core shaft 10 to communicate with the inner pipe pushing jig 12, a cylinder rod 17 for externally fitting the core shaft 10 to communicate with the shaft 16, and a cylinder rod 17 for external fitting. Inner tube pushing cylinder 18
A rotary shaft 19 which is inserted into the carriage 13 and communicates with the chuck mechanism 7, a twisting pulley 20 which twists the chuck mechanism 7 through the rotary shaft 19, and a twisting pulley 20 which communicates with the twisting pulley 20 through a belt 22. Motor 21
It consists of and.

Next, the bending process by the double pipe bending device 1 will be described. First, the rear end portion 2B of the double pipe 2 is guided toward the chuck mechanism 7, and the outer core metal 8 and the inner core metal 9 are guided.
The inner pipe 2a is disposed between the inner pipe 2a and the inner pipe 2a, and the rear end portion 2a1 of the inner pipe 2a is brought into contact with the inner pipe pushing jig 12, and the outer pipe 2
b is arranged, and the rear end portion 2b1 of the outer tube 2b is brought into contact with the chuck mechanism 7.

Next, a pressure fluid is supplied to the chuck function 7 to move the three claws 7a in the central direction to engage the rear end portion 2b1 of the outer tube 2b. Next, attach the carriage 13 to the rail 15
And the tip portion 2A of the double pipe 2 is arranged between the bending die 4 and the tightening die 5, and when the bending die 4 comes to the bending portion of the double pipe 2, the carriage 13 Stop moving.

Next, the clamping die 5 is moved toward the bending die 4, the double tube 2 is sandwiched by the bending die 4 and the clamping die 5, and the pressure die 5a is brought into contact with the outer periphery of the double tube 2. . The bending arm 5b is rotated to revolve the clamping die 5 around the bending die 4. Even during this bending process, the rear end portion 2B of the double pipe 2
From the side, it keeps pushing in. In this way, the push-bending process according to the shape of the double pipe 2 is performed.

[0007]

However, in the conventional double pipe bending apparatus 1 as described above, the chuck mechanism 7 for holding the rear end portion 2b1 of the outer pipe 2b is pressed by the carriage 13 and the inner pipe 2a is pressed. Pushing the double tube 2 such that the rear end portion 2a1 is pushed by the inner tube pushing cylinder 18,
There were two systems, and the equipment was complicated and required expensive equipment. The present invention has been made to solve such conventional problems, and an object thereof is a double pipe bending apparatus capable of easily pushing a double pipe without using a complicated mechanism. To provide.

[0008]

The invention according to claim 1 is
By a rotatable bending die and a fastening die capable of revolving around the bending die, one end of a double pipe consisting of an inner pipe and an outer pipe is clamped, and the fastening die is revolved to revolve the double pipe. A double pipe pushing mechanism having a bending mechanism for bending, a chuck mechanism for holding the ends of the inner pipe and the outer pipe of the double pipe, and a carriage for pressing the chuck mechanism toward the bending mechanism. A device main body provided with a rail on which the double-tube pushing mechanism is movably mounted and a cradle for receiving a reaction force of the double-pipe when the double-pipe pushing mechanism is pushed. Outer cored bar disposed between the inner and outer tubes of the inner tube, an inner cored bar disposed inside the inner tube of the double tube, and a slide rod disposed at the rear end of the inner cored bar. And a cored bar shaft arranged between the slide rod and the mount. A slide ring disposed on the slide rod for abutting the end of the inner pipe; and a push claw disposed on the slide rod for abutting the end of the outer pipe, wherein the push claw is It is characterized in that it is configured to be gripped by the chuck mechanism and moved on the apparatus main body by the carriage to press the ends of the inner pipe and the outer pipe toward the bending mechanism.

According to a second aspect of the present invention, in the double pipe bending apparatus according to the first aspect, the outer core metal and the inner core metal are rounded along the entire circumference of the tip portion on the bending mechanism side.
It is characterized by being attached. According to a third aspect of the present invention, in the double pipe bending apparatus according to the first or second aspect, the outer cored bar is provided with an outer cored bar holder having an opening through which the pushing claw projects. A rear end portion is supported by an outer retaining ring fixed to the gold shaft.

According to a fourth aspect of the present invention, in the double pipe bending apparatus according to any one of the first to third aspects, the pushing claw is fixed to the slide ring with a screw. Characterize.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the embodiments shown in the drawings. 1 to 3 show a double pipe bending apparatus 30 according to an embodiment of the present invention (corresponding to claims 1 to 4). In the double pipe bending apparatus 30 according to the embodiment of the present invention, the carriage, the chuck mechanism, the bending mechanism and the apparatus main body are configured in the same manner as the conventional double pipe bending apparatus 1 shown in FIG. Therefore, in the following description, the double pipe pushing mechanism, which is the main part of the invention, will be described, and the illustration and description thereof will be omitted, and the same reference numerals as those in FIG.

The double pipe pushing mechanism 40 comprises an outer core metal 41 arranged between the inner pipe 2a and the outer pipe 2b of the double pipe 2,
Inner core metal 43 arranged inside the inner pipe 2a of the double pipe 2.
A slide rod 45 arranged at the rear end portion 43b of the inner cored bar 43, a cored bar shaft 47 arranged between the slide rod 45 and the mount 11, and an inner pipe 2a arranged on the slide rod 45. The slide ring 49 is in contact with the end 2a1, and the four push claws 51 fixed to the slide rod 45 are in contact with the end 2b1 of the outer tube 2b.

The outer mandrel 41 and the inner mandrel 43 are
R is attached to the entire circumference of the tip portions 41a and 43a on the bending mechanism 3 side so that the twist applied to the double pipe 2 during bending can be followed. Rear end portion 41b of the outer core metal 41
Is an opening 56 for projecting the four push claws 51, respectively.
It is connected to the outer holding ring 53 via an outer cored bar holder 55 having.

The outer cored bar holder 55 is shown in FIGS.
As shown in FIG. 4, the two end portions 55a, 55b of the four plate members are fitted into the concave portions formed in the rear end portion 41b of the outer core metal 41 and the front end portion 53a of the outer holding ring 53, respectively. It is fixed by welding. The outer retaining ring 53 is screwed onto the core shaft 47. A fixing nut 57 is attached to the rear end portion of the outer retaining ring 53 to prevent movement.

The pushing claw 51 is fixed to the slide ring 49 by a screw 52, as shown in FIGS. The push claw 51, as shown in FIG.
It is held by the four claws 7a. In addition, in FIG.
Although the description has been made using the three claws 7a, in the present embodiment, it is 4
The claw 7a is arranged for each of the individual push claws 51.

Next, the operation of the double pipe bending apparatus 30 according to this embodiment will be described. First, the rear end portion 2B of the double pipe 2 is guided toward the chuck mechanism 7, the inner pipe 2a is disposed between the outer core metal 41 and the inner core metal 43, and the rear end portion 2a1 of the inner pipe 2a is slid ring. The outer pipe 2b is disposed outside the outer core metal 41, and the rear end 2b1 of the outer pipe 2b.
Is brought into contact with the chuck mechanism 7.

Next, a pressure fluid is supplied to the chuck function 7 to move the four claws 7a toward the center to move the four push claws 51.
Dig in. As a result, the rear end 2a1 of the inner pipe 2a and the rear end 2b1 of the outer pipe 2b are fixed together. Next, the carriage 13 is moved along the rails 15 to dispose the tip end portion 2A of the double pipe 2 between the bending die 4 and the tightening die 5, and to bend the bending die 4 at the bending portion of the double pipe 2. When the carriage comes, the carriage 13 stops moving.

Next, the clamping die 5 is moved toward the bending die 4, the double tube 2 is sandwiched by the bending die 4 and the clamping die 5, and the pressure die 5a is brought into contact with the outer periphery of the double tube 2. . The bending arm 5b is rotated to revolve the clamping die 5 around the bending die 4. Even during this bending process, the double pipe pushing mechanism 4
In the case of 0, the push claw 51 is gripped by the chuck mechanism 7 and moved on the apparatus main body 14 by the carriage 13, and the inner tube 2a
And a bending mechanism 3 for bending the ends 2a1 and 2b1 of the outer tube 2b.
Pushing in the direction.

Thus, the push-bending process according to the shape of the double pipe 2 is performed. As described above, in the present embodiment, the double pipe pushing mechanism 40 has the inner pipe 2a and the outer pipe 2b when the pushing claw 51 is gripped by the chuck mechanism 7 and moved on the apparatus main body 14 by the carriage 13. Since the end portions 2a1 and 2b1 of the inner tube 2a can be pressed in the direction of the bending mechanism 3, a long cylinder device that reaches the pedestal 11 to press the end portion 2a1 of the inner tube 2a is prepared as in the conventional case. As a result, it is possible to perform the same bending process as before using a simple device.

In the above embodiment, the four push claws 5 are used.
Although the case of using 1 has been described, three may be used in correspondence with the conventional chuck mechanism.

[0021]

According to the double pipe bending apparatus of the present invention, the double pipe can be easily pushed in without using a complicated mechanism.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of a double pipe bending apparatus according to an embodiment of the present invention.

FIG. 2 is a view taken along the line AA of FIG.

FIG. 3 is an explanatory diagram showing a combined state of an outer core metal, an outer core metal holder, and an outer holding ring.

FIG. 4 is a perspective view showing a conventional double pipe bending apparatus.

5 is a cross-sectional view showing the main parts of FIG.

[Explanation of symbols]

2 double tubes 2a inner tube 2b outer tube 3 Bending mechanism 4 bending type 5 tightening type 7 Chuck mechanism 7a nail 11 stand 13 carriage 14 Device body 15 rails 30 Double pipe bending machine 40 Double tube pushing mechanism 41 Outer core 43 Inner core 45 slide rod 47 core shaft 49 slide ring 51 push claw 53 Outer retaining ring 55 Outer core metal holder 56 openings

Claims (4)

[Claims] 1. A rotatable bending die and a fastening die capable of revolving around the bending die hold one end portion of a double pipe consisting of an inner pipe and an outer pipe, and revolve the fastening die. A bending mechanism that bends the double pipe; a chuck mechanism that holds the ends of the inner pipe and the outer pipe of the double pipe; and a carriage that presses the chuck mechanism toward the bending mechanism. A heavy pipe pushing mechanism; and a device main body provided with a rail on which the double pipe pushing mechanism is movably mounted and a pedestal for receiving a reaction force of the double pipe at the time of pressing, wherein the double pipe pushing mechanism is An outer core metal arranged between the inner pipe and the outer pipe of the double pipe, an inner core metal arranged inside the inner pipe of the double pipe, and a rear end portion of the inner core metal. A slide rod to be disposed, and a slide rod disposed between the slide rod and the mount. A core metal shaft, a slide ring arranged on the slide rod for abutting an end portion of the inner pipe, and a push claw arranged on the slide rod for abutting an end portion of the outer pipe, At this time, the pushing claw is held by the chuck mechanism and moved on the apparatus main body by the carriage to push the end portions of the inner pipe and the outer pipe toward the bending mechanism. Characteristic double pipe bending device. 2. The double pipe bending apparatus according to claim 1, wherein the outer core metal and the inner core metal are rounded around the entire circumference of the tip end on the bending mechanism side. Double pipe bending machine. 3. The double pipe bending apparatus according to claim 1, wherein the outer cored bar is attached to the cored bar shaft through an outer cored bar holder having an opening through which the pushing claw projects. A double pipe bending apparatus having a rear end supported by a fixed outer retaining ring. 4. The double pipe bending apparatus according to claim 1, wherein the push claw is fixed to the slide ring with a screw. Bending machine.