JPH09103908A - Method and device for cutting tube body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve machining efficiency and to simplify a structure by using a plurality of rotary tools. SOLUTION: Since a plurality of rotary tools 4 arranged at equal intervals in the outer periphery of a tube body P are moved in an axial direction toward the center of the tube body and the circumferential direction of the tube body P so as to cut the tube body P, cutting and machining are performed with a smaller cutting force compared with that for machining by a byte and thus, machining efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when cutting a tubular body, uses a plurality of rotary tools that perform processing by moving in the axial direction of a rotating shaft and moving in a direction orthogonal to the rotating shaft. Accordingly, the present invention relates to a method and apparatus for cutting a tubular body, which can improve processing efficiency and can be configured with a simple structure.

[0002]

2. Description of the Related Art In recent years, a large amount of water has been required as the population has increased, and the diameters of pipes used as water supply pipes and distribution pipes for supplying such water have been proportionally increased.

On the other hand, most of these pipes are buried underground, but they are often changed due to city planning, for example, new branch pipes are taken out from conventional pipes, and natural disasters such as earthquakes occur. When a crack due to the cracks or corrosion occurs after being used for many years, the portion is cut at a predetermined interval and another pipe is connected to the portion.

Further, in addition to the above-mentioned buried pipe, pipes used in chemical plants, hydraulic power plants, nuclear power plants, etc. are installed on the ground.

These pipes have various forms such as horizontal, vertical and diagonal, and fixed pipes of various forms are cut from the middle at predetermined intervals.

[0006] Such cutting work of the fixed pipe is mainly performed on site, and is usually performed in a state of uninterrupted water in which a fluid (for example, water) remains in the pipe. In order to prevent water leakage, the cutting part and the periphery of the cutting device are covered with a casing (housing) in a water-sealed state in advance.

Further, in the cutting device used for such a cutting operation of the pipe body, conventionally, a plurality of unillustrated tools (bites, etc.) are swiveled in the circumferential direction of the pipe body on the outer circumference of the pipe body of the fixed pipe. While doing so, cutting feed is performed in the direction of the center of the pipe.

[0008]

In the on-site cutting work of the pipe body by such a tool (bite etc.), the cutting feed rate in the circumferential direction with respect to one cutting feed in the axial direction is the rigidity of the supporting device. Therefore, the machining efficiency decreases because it cannot be raised too much, and since a large cutting force acts, the device supporting the cutting tool etc. becomes complicated and large, resulting in high cost. However, it has a drawback that its structure is complicated because it is automatically fed.

According to the present invention, when a part of a pipe is cut, a plurality of rotary tools are used as tools to be used, so that the working efficiency can be improved and the structure can be simplified. It is an object to provide a method and a device.

[0010]

In the method of cutting a tubular body of the present invention, a plurality of rotary tools for machining by moving in the axial direction of the rotating shaft and moving in the direction orthogonal to the rotating shaft are provided on the outer circumference of the tubular body. Is evenly arranged, and the tube is cut by a cutting movement in an axial direction of the rotary tool facing the tube center of the rotary tool and a cutting movement in a circumferential direction. With this feature, it is possible to perform the cutting process with a cutting force smaller than that in the conventional process using the cutting tool, so that the processing efficiency can be improved.

In the method of cutting a tubular body of the present invention, the cutting movement of the rotary tool is carried out by axially cutting and moving the plurality of rotary tools toward the center of the tubular body to pierce the tubular body, and then the rotary tool is cut. It is preferable to cut and move the tubular body by moving it in the circumferential direction of the tubular body. Thereby, the cutting movement of the rotary tool in the circumferential direction of the pipe body can be performed in the shortest distance, so that the working efficiency can be further improved.

The pipe body cutting method according to the present invention, after the groove machining of a predetermined circumferential length by the axial cutting movement with the rotary tool toward the center of the pipe body and the swiveling cutting movement in the circumferential direction of the pipe body, It is preferable to perform a reverse turning cutting movement to cut the pipe body. Accordingly, the cutting movement range of the rotary tool in the circumferential direction of the pipe body can be performed in a small cutting movement range, and the cutting and cutting can be performed with a smaller cutting force, so that the working efficiency can be further improved.

The pipe cutting device of the present invention comprises a rotary tool which is rotationally driven, an axial cutting moving means which is fixed to a frame body and moves the rotary tool in the axial direction, and the rotary tool is a circle of the pipe body. It is characterized by comprising a turning cutting moving means for cutting and moving in the circumferential direction. With this feature, it is possible to perform the cutting process with a small cutting force, so that the processing efficiency can be improved.

In the tubular body cutting device of the present invention, the tubular body cutting device is installed at a predetermined portion of the tubular body, and the tubular body and the tubular body cutting device are surrounded by a casing, and the tubular body cutting device is provided together with the cutting tubular body. Is a pipe cutting device used for pipe cutting work of uninterrupted water to extract from the cutting portion, wherein the pipe cutting device is a rotary tool that is rotationally driven, and the rotary tool is fixed to a frame body in the axial direction. To move the rotary tool in the circumferential direction of the pipe body, and to move the rotary tool part from the cutting part to the pipe cutting device side after cutting the pipe body. It is characterized in that it is configured with a retracting means for moving. Due to this feature, when taking out the cutting pipe after cutting, the rotary tool part stands by from the cutting part of the cutting pipe to the pipe cutting device side, so the cutting pipe and the pipe cutting device can be taken out. It will be easier.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the accompanying drawings with reference to the embodiments.

First, the tube cutting device of the present invention will be described.

FIG. 1 shows the first embodiment of the present invention and is an overall view showing a state in which a pipe cutting device is attached to a pipe.
FIG. 5 is a sectional view of the tubular body cutting device.

In FIGS. 1 and 5, 1 is a tube cutting device, 2a and 2b are fixed tubes, and 3 is a cutting tube.

The pipe cutting device 1 is mainly constituted by a rotary tool 4 which is rotationally driven, an axial cutting moving means 6 which is fixed to a frame body 5 and moves the rotary tool 4 in the axial direction, and a rotary tool 4 of the pipe P. The turning cutting moving means 7 for cutting and moving in the circumferential direction, the rotary tool 4 from the cutting portion C of the cutting tubular body 3 after cutting the tubular body, the fixed tubular body 2
It is composed of a retracting means 8 and the like for moving away from the sides a and 2b.

More specifically, as shown in FIG. 5, the rotary tool 4 is mainly an end mill, for example. The end mill 4 is mounted on the housing 9 and is rotationally driven by the power of the drive source 10.

An electric motor is used as the drive source 10, but it is also possible to use an actuator operated by a hydraulic or pneumatic pressure source depending on the environment of use.

Next, the axial cutting movement means 6 includes a hydraulic cylinder 11 fixed to the bottom of the frame 5, a piston 12 slidably fitted in the hydraulic cylinder 11, and one end of the piston 12. Is fixed to the hollow rod 13, and a holder 14 fixed to the lower end of the hollow rod 13 and holding the rotary tool 4 at the tip.

Further, the turning cutting moving means 7 shown in FIG.
A pair of guide chains 20a, 20b wound around the fixed side tubular body 2a or 2b, and the guide chains 20a, 20b.
a drive unit 21 that is locked to b and is guided and moved on guide chains 20a and 20b via sprockets 24a and 24b, which will be described later, and a drive unit 21 that is locked to both sides of the drive unit 21 (in the circumferential direction of the pipe). A traction chain 25 that pulls and stretches the unit 21 on the outer circumference of the tube body 2a or 2b, a pair of wheels 26a and 26b that rotatably supports the drive unit 21 on the outer circumference of the fixed tube body 2a or 2b, and a drive unit. A drive source 22 (electric motor or hydraulic motor) for moving 21 on the outer circumference of the fixed tubular body 2a or 2b.

Specifically, the sprockets 24a, 24b
Are fixed to both ends of a rotary shaft 27 rotatably supported on the bottom of the drive unit 21 on both outer sides of the drive unit 21.

Further, a pair of wheels 26a and 26b are rotatably supported on the drive shaft 27 inside the drive unit 21 with respect to the drive shaft 27.

Although not shown, the drive unit 21
Another drive shaft is rotatably supported in the turning direction of
The drive shaft is provided with a pair of sprockets and wheels of the same construction.

The drive unit 21 basically holds one rotary tool per unit, but the drive unit 21 is not limited to one and may have two or more rotary tools.

A plurality of drive units 21 can be evenly arranged on the outer circumference of the fixed-side tube depending on the diameter of the tube to be cut, and on both sides of one tube-cutting device 1. It is also possible to provide a rotary tool and cut both sides of the drive unit 21 at the same time.

Further, the retracting means 8 is, as shown in FIG.
A composite bearing 15 having an upper end integrated with the frame 5 for thrust and radial bearings, and a spline 16 axially supported through the composite bearing 15 and inserted through the hollow rod 13 to engage with the holder 14 below are formed. The turning shaft 17 and the drive source 19 for transmitting the turning driving force to the turning shaft 17 via a pair of bevel gears 18.

The tube cutting device of the present invention thus constructed operates as follows.

First, the tip of the rotary tool 4 is set at a position close to the first machining position on the outer circumference of the pipe P.

Then, the rotary tool 4 is rotationally driven by the drive source 10, and at the same time, the axial moving means 6 is operated to gradually move the rotary tool 4 by the axial cutting feed.

When the tip of the rotary tool 4 comes into contact with the outer circumference of the pipe and starts drilling, the rotary cutting moving means 7 is operated while the rotary tool 4 is rotated, and the drive unit 21 is gradually moved along the outer circumference of the pipe. The groove is machined on the outer circumference of the pipe P by performing the swivel cutting movement.

More specifically, as shown in FIG. 1, when the drive source 22 is activated, the pair of drive shafts 27 are rotationally driven via the sprockets 23, and thereby the four sprockets 24a, 24b ... Are rotationally driven. It

When the sprockets 24a and 24b are rotationally driven, the sprocket 24a and 24b are guided by the pair of chains 20a and 20b that are engaged with each other to start the turning movement in the outer peripheral direction of the pipe P.

The drive unit 21 rolls four wheels 26a, 26 around the outer circumference of the pipe P when it turns.
It moves while being supported by b.

At the time of this movement, the drive unit 21 is held in a stable state by the tow chains 25 towed on both sides thereof.

If a plurality of drive units 21 are arranged on the outer circumference of the pipe body in accordance with the number of rotary tools 4, the pulling chain 25 has a plurality of drive units 21.
It will be connected between and to be pulled and stretched respectively.

In this way, the plurality of rotary tools 4 are connected to the pipe P.
By arranging them evenly on the outer periphery of the pipe, by performing cutting work on the pipe by axial cutting movement of the rotary tool 4 toward the center of the pipe P and cutting movement in the pipe circumferential direction,
Since cutting can be performed with a small cutting force,
The processing efficiency can be improved.

Next, the case where the pipe P is cut with uninterrupted water as shown in FIG. 6 will be explained. The cut pipe 3 is taken out to the outside. , If the cutting tube 3 is pulled up as it is,
The rotary tool 4, the housing 9, the drive source 10, the holder 14, etc. of the pipe cutting device 1 located below interfere with the fixed pipe P.

Therefore, the rotary tool 4 is swung around the swivel shaft 17 shown in FIG.
Alternatively, the cutting pipe 3 can be taken out together with the pipe cutting device 1 by moving away from the 2b side to the cutting pipe 3 side, that is, the pipe cutting device 1 side. In this way, when the pipe cutting device 1 and the cutting pipe 3 are both pulled up from the housing B after the cutting of the uninterrupted water pipe, the retracting means 8 is effective.

Next, the method of cutting the tubular body of the present invention will be described with reference to FIG.
~ It demonstrates below based on FIG.

FIG. 2 is an explanatory view of the pipe body cutting method showing the first embodiment, FIG. 3 is an explanatory view of the pipe body cutting method showing the second embodiment, and FIG. 4 is a pipe showing the third embodiment. It is explanatory drawing of a body cutting method.

First, in the first embodiment of the tube cutting method,
As shown in FIG. 2, three rotary tools 4 are provided on the outer periphery of the pipe P.
a, 4b, and 4c are evenly arranged.

FIG. 2 shows three rotary tools 4a, 4b, 4c.
Is performed by simultaneously performing the axial cutting movement toward the center of the tubular body P and the cutting movement in the circumferential direction of the tubular body.

That is, the rotary tools 4a and 4b will be described. When the rotary cutting movements are started from the start positions S1 and S2 where the tips of the rotary tools 4a and 4b contact the outer periphery of the pipe P at the same time, for example, the rotary tools Four
a is E1, and the rotary tool 4b is E2, so that the pipe P can be partially cut.

However, in the movement up to this point, the pipe P is not completely cut because there is still a residual thick portion between E2 and E1 in the rotary tool 4b.

Therefore, the processing ends E1 of the rotary tools 4a and 4b
The remaining thick part (shaded part) between the E and E2 is the rotary tool 4b.
Can be completely cut by further performing the turning cutting movement from E2 to E1.

The rotary movement range of the rotary tool changes depending on the cutting feed amount in the axial direction and the wall thickness of the pipe body.

This is three rotary tools 4a, 4b, 4c.
The same thing can be done at the same time with respect to
The processing efficiency can be shortened.

Next, in the second embodiment of the tubular body cutting method,
As shown in FIG. 3, three rotary tools 4 are provided on the outer periphery of the pipe body P.
a, 4b, and 4c are evenly arranged.

FIG. 3 shows three rotary tools 4a, 4b, 4c.
After perforating the pipe by axial cutting movement toward the center of the pipe P and then cutting and moving the rotary tools 4a, 4b, 4c in the pipe circumferential direction to cut the pipe P. Is.

That is, the three rotary tools 4a, 4b, 4
c are arranged in the same phase in the turning movement direction, and each rotary tool cuts the pipe body P at the shortest moving distance by the turning cutting movement of 1/3 rotation to the position of the next rotary tool. be able to.

As a result, the cutting movement in the circumferential direction of the tubular body can be performed at the shortest distance, so that the working efficiency can be further improved.

Next, in the third embodiment of the tube cutting method,
As shown in FIG. 4, three rotary tools 4 are provided on the outer periphery of the pipe body P.
a, 4b, and 4c are evenly arranged.

FIG. 4 shows three rotary tools 4a, 4b and 4c.
A groove processing of a predetermined circumference length by axial cutting movement toward the center of the pipe P and swiveling cutting movement in the circumferential direction of the pipe, and then cutting the pipe by reverse swiveling cutting movement Is.

That is, the rotary tools 4a and 4b will be described. From the start positions S1 and S3 where the rotary tools 4a and 4b are simultaneously in contact with the outer periphery of the pipe P, the turning cutting movements are started to the grooves E1 and E3, respectively. Processing is performed.

After that, the rotary tools 4a, 4b are moved from the E1 and E3 positions in the reverse swivel cutting movement and returned to the original start positions E2, E4, whereby the pipe body can be cut.

In order to ensure the cutting process, it is more preferable that the rotary tool is moved in the axial direction at the turning-back positions E1 and E3 of each rotary tool so as to be perforated and then reversely swiveled.

As a result, since the cutting movement range of the rotary tool in the circumferential direction of the tubular body can be performed in a small cutting movement range and the cutting and cutting can be performed with a smaller cutting force,
The processing efficiency can be further improved.

In the above-described embodiments of the tube body cutting method and apparatus of the present invention, only one side of the tube body is cut, but unnecessary tube bodies are cut at predetermined intervals to drive the drive unit. Needless to say, it is preferable to simultaneously cut the two cutting portions C at the same time for taking out together.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments. For example, an example in which a hydraulic cylinder is used as the axial cutting movement means has been described. However, this may be combined with a hydraulic or electric motor and a ball screw / nut, or may be manually fed, and the movement of the retreating means The turning movement is not limited to horizontal turning but may be vertical turning. However, the present invention includes modifications and additions without departing from the scope of the present invention.

[0063]

The present invention has the following effects.

(A) In the tubular body cutting method of the first aspect, the tubular body is cut by axially cutting movements of a plurality of rotary tools toward the center of the tubular body and cutting movements in the circumferential direction of the tubular body. Therefore, the cutting work can be performed with a cutting force smaller than that of the conventional cutting work, so that the working efficiency can be improved.

(B) According to a second aspect of the present invention, the rotary tool is cut and moved by axially cutting and moving the plurality of rotary tools toward the center of the tubular body. Since the cutting tool is moved in the circumferential direction of the tubular body to cut the tubular body, the cutting movement of the rotary tool in the circumferential direction of the tubular body can be performed in the shortest distance, so that the working efficiency can be further improved.

(C) According to claim 3, the cutting movement of the rotary tool is performed at the same time as the axial cutting movement of the rotary tool toward the center of the tubular body, after the predetermined length cutting movement in the circumferential direction of the tubular body. Since the pipe is cut by performing the reverse turning cutting movement, the cutting movement range of the rotary tool in the pipe circumferential direction can be performed in a small cutting movement range, and the cutting cutting is performed with a smaller cutting force. Therefore, the processing efficiency can be further improved.

(D) In the tubular body cutting device according to the fourth aspect, since the cutting process can be performed with a small cutting force, the processing efficiency can be improved.

(E) In the tubular body cutting device according to the fifth aspect, when the cutting tubular body is taken out after the cutting process, the rotary tool portion stands by from the cutting portion of the cutting tubular body toward the tubular body cutting device side, and thus stands by. The removal work of the cutting tube becomes easy.

[0069]

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a tubular body cutting device of the present invention,
It is the whole figure showing the state where the pipe cutting device was attached to the pipe.

FIG. 2 is an explanatory diagram of a processing method showing the first embodiment of the tube cutting method of the present invention.

FIG. 3 is an explanatory view of a processing method showing a second embodiment of the tubular body cutting method of the present invention.

FIG. 4 is an explanatory diagram of a processing method showing a third embodiment of the tubular body cutting method of the present invention.

FIG. 5 shows a first embodiment of the tube cutting device of the present invention,
It is sectional drawing of a pipe cutting device.

FIG. 6 is an overall view when cutting an uninterrupted water pipe body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe cutting device 2a, 2b Fixed pipe 3 Cutting pipe 4 Rotating tool 5 Frame 6 Axial cutting moving means 7 Swiveling cutting moving means 8 Retracting means 9 Housing 10 Drive source 11 Hydraulic cylinder 12 Piston 13 Hollow rod 14 Holder 15 compound bearing 16 spline 17 swivel shaft 18 bevel gear 19 drive source 20a, 20b guide chain 21 drive unit 22 drive source 23 sprockets 24a, 24b sprocket 25 traction chain 26a, 26b wheel 27 rotating shaft C cutting part P tube body B housing

Claims (5)

[Claims] 1. A tubular body cutting method for cutting a tubular body, comprising a plurality of rotary tools for performing machining by moving in a direction of an axis of rotation and moving in a direction orthogonal to the axis of rotation. A cutting method for a tubular body, wherein the tubular body is cut by a cutting movement in an axial direction toward the tubular body center of the rotary tool and a cutting movement in a circumferential direction. 2. The cutting movement of the rotary tool is such that the plurality of rotary tools are axially cut and moved toward the center of the pipe body to pierce and pierce the pipe body, and then the rotary tool is moved in the circumferential direction of the pipe body. The method for cutting a tubular body according to claim 1, wherein the tubular body is cut and processed by cutting and moving. 3. The cutting movement of the rotary tool is performed after a groove having a predetermined circumferential length is formed by axial cutting movement in which the rotary tool is directed toward the center of the tubular body and swivel cutting movement in the circumferential direction of the tubular body. 2. The method for cutting a tubular body according to claim 1, wherein the tubular body is cut by performing reverse turning cutting movement. 4. A tubular body cutting device for cutting a tubular body, wherein the tubular body cutting device is a rotary tool that is rotationally driven, and an axial cutting device that is fixed to a frame body and moves the rotary tool in an axial direction. A tubular body cutting device comprising a moving means and a swivel cutting moving means for cutting and moving the rotary tool in a circumferential direction of the tubular body. 5. A pipe cutting device is installed at a predetermined portion of the pipe body, and the pipe body and the pipe body cutting device are surrounded by a casing, and the pipe body cutting device together with the cutting pipe body is pulled out from a cutting portion. Is a tubular body cutting device used for the tubular body cutting work, wherein the tubular body cutting device is a rotary tool that is rotationally driven, and an axial cutting movement that is fixed to a frame and moves the rotary tool in an axial direction. Means, swivel cutting moving means for cutting and moving the rotary tool in the circumferential direction of the tubular body, and withdrawal means for moving the rotary tool part away from the cutting portion toward the tubular body cutting device side after cutting the tubular body. A tubular body cutting device characterized in that