JP3149204B2 - Pipe cutting method and pipe cutting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe cutting method and a pipe cutting apparatus, and more particularly to a pipe cutting method and a pipe cutting apparatus for a pipe having a coating.

[0002]

2. Description of the Related Art In a conventional pipe cutting method, a cutting cutter is provided on a holding body that rotates about the axis of a pipe to be cut.
Using the cutter, the pipe body was cut without removing the coating of the pipe to be cut.

[0003]

When a pipe having a coating is cut by a conventional pipe cutting method, if the coating is relatively thick and soft like a resin coating, the coating is pushed in the vicinity of the cut surface during cutting. As shown in FIG. 4, a raised portion 1 and a burr portion 2 are formed near the cut surface.

As described above, when cutting a pipe having a coating, the coating is not cut cleanly in the vicinity of the cut surface, and when the bulging portion 1 or the burr portion 2 is formed, it is difficult to perform a double flaring process or a single flaring process. A high quality pipe could not be obtained, and especially in the case of a flare-processed product, there was a problem that a burr was caught on the sheet surface and leakage occurred.

The present invention has been made in view of the above-described current situation of cutting a pipe having a coating, and an object of the present invention is to provide a pipe cutting method and apparatus capable of cutting a pipe having a coating of resin or the like neatly. To provide.

[0006]

In order to achieve the above object, in a first embodiment of the present invention, a pipe to be cut having a coating is fixed, and an axis of the pipe is fixed to the pipe to be cut. By moving the coating removing tool toward the pipe to be cut while rotating as a center, the predetermined width of the coating at the cutting position is removed in a circumferential direction, and the cutting cutter is moved to move the pipe to be cut. The film is cut within a predetermined width of the removed film.

In order to achieve the above object, a second embodiment of the present invention is directed to a holding member which is inserted around its axis and rotated about the axis of a fixed pipe to be cut,
A film removing tool provided on the holder so as to be able to advance and retreat in the radial direction and having a predetermined width on the outer peripheral surface, a cutting cutter provided on the holder so as to be able to advance and retreat in the radial direction, and Rotate to the center, advance the coating removing tool in the direction of the pipe to be cut, remove a predetermined width of the coating of the pipe to be cut at the cutting position in the circumferential direction, and move the cutting cutter in the direction of the pipe to be cut. And a control device for performing drive control to cut the pipe to be cut within a predetermined width of the removed coating.

[0008]

According to the present invention, the pipe to be cut is fixed, and the film removing tool provided on the holder rotating about the axis of the pipe moves in the axial direction along the extension of the radius of the pipe to be cut. The coating at the cutting position of the pipe to be cut is removed in the circumferential direction at a predetermined width by the tool.

At substantially the same time as or after the removal of the coating,
The cutting cutter provided on the rotating holding body advances in the axial direction with respect to the pipe to be cut, and is cut in the predetermined width of the pipe to be cut from which the coating of the predetermined width has been removed, and the pipe having the coating is formed. , Cut on a clean cut surface.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment of a pipe cutting apparatus with reference to the drawings.

FIG. 1 is an explanatory front view showing the structure of a main part of an embodiment of a pipe cutting apparatus, FIG. 2 is a side view showing the structure of a main part of an embodiment of a pipe cutting apparatus, FIGS. 3a and 3b. FIG. 4 is an explanatory view showing the operation of one embodiment of the pipe cutting device.

As shown in FIG. 1, a support 2
Is fixed, and a holder 5 is rotatably attached to the support 2 via a bearing 3. An insertion opening 6 through which the pipe 7 to be cut is inserted is formed at the axial center position of the holder 5. Further, a pulley 8 connected to a drive motor of a control device (not shown) by a belt is fixedly provided at one end of the holder 5.

Guide grooves 10a and 10b are formed in the other end of the holding member 5 in the radial direction, and moving bodies 11a and 11b are fitted in these guide grooves so as to be able to advance and retreat in the radial direction, respectively. ing. Pipe receiving rollers 12a and 12b are fixed to the ends of the moving bodies 11a and 11b, respectively. The pipe receiving roller 12a has a film removing tool 13a having a predetermined width on an outer peripheral surface, such as a cutting tool.
Is fixed with its tip protruding.

The moving bodies 11a and 11b are respectively guided by guide grooves 10a and 10b by cams 15a and 15b.
, And these cams are controlled and driven by a control device (not shown).

Further, a guide groove 17 is formed in the other end side of the holding body 5 in the radial direction, and a moving body 20 having a cutting cutter 18 rotatably fixed at the tip thereof in the guide groove 17 in the radial direction. Are fitted so as to be able to advance and retreat. The moving body 20 is driven forward and backward by the cam 21 along the guide groove 17.

On the other hand, there are provided pipe fixing clamps 25a and 25b for holding and fixing both ends of the pipe 7 to be cut inserted through the insertion opening 6 of the holder 5, and these pipe fixing clamps can be clamped or released. It is configured to be performed by a control device (not shown).

Next, the operation of the embodiment having such a configuration will be described.

The holder 5 is moved by a pipe feeding device (not shown).
The pipe to be cut 7 having, for example, a coating 7a of a resin material is fed into the insertion opening 6 until the cutting position reaches a position facing the cutting cutter 18 and the coating removal tool 13a.

When the pipe 7 to be cut is sent to the predetermined position, the control device starts operating, and the pipe fixing clamps 25a and 25b hold and fix the pipe 7 to be cut. Is fixed. On the other hand, the drive motor of the control device rotates, and this rotation is transmitted to the pulley 8 via a belt (not shown), and the holder 5 rotates.

Next, the cams 15a and 15b are driven,
The moving bodies 11a and 11b start to advance along the guide grooves 10a and 10b in the axial direction of the holder 5, and the coating 7a of the pipe 7 to be cut is cut by the coating removing tool 13a at the cutting position as shown in FIG. 3A. It is removed at a predetermined width. Here, the film removing tool 13a can adjust the protruding length from the pipe receiving roller 12a in accordance with the thickness of the film 7a of the pipe 7 to be cut. By 13a, the coating 7a at the cutting location is removed cleanly with a predetermined width.

The moving body 20 is moved by the cam 21 to the holding body 5.
The pipe 7 to be cut is cut within the predetermined width by the cutting cutter 18 by moving forward along the guide groove 17. At this time, as described above, since the coating 7a of the cut portion of the pipe 7 to be cut has already been removed by the coating removing tool 13a, high quality and high quality can be obtained without any swelling or entanglement of the coating 7a near the cut surface. A cutting pipe is obtained.

When the cutting is completed, the cam 1 is controlled by the control device.
5a, 15b, 21 are driven, and the moving bodies 11a, 11
The b and 20 move, and the pipe receiving rollers 12a and 12b and the cutting cutter 18 return to their original positions. The pipe to be cut, which has been cut to a predetermined length, is taken out. If the pipe to be cut 7 further has a cutting point, the pipe to be cut 7 is cut by a pipe feeding device (not shown) into a cutting cutter 18. It is transported until it comes to a position facing the film removing tool 13a. Then, the pipe 7 to be cut is cut in the same manner as described above.

When the cutting of one pipe 7 to be cut is completed in this way, the next pipe to be cut is fed into the insertion opening 6 of the holder 5 by the pipe feeding device, and the same cutting operation is repeated. .

As described above, according to the embodiment,
For example, when cutting the pipe to be cut 7 having the coating 7a of the resin material, a raised portion or a entangled portion of the coating 7a does not occur near the cut surface, and a high quality cut pipe having the coating can be obtained.

Although the embodiment has been described with reference to the case where one film removing tool is provided, the present invention is not limited to the embodiment, and for example, a plurality of film removing tools may be provided.

[0026]

According to the present invention, since the coating of the pipe to be cut is removed by the coating removal tool and the pipe to be cut is cut by the cutting cutter, the swelling of the coating and the burr portion do not occur near the cut surface. A high quality cut pipe having a coating with a clean cut surface can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view illustrating an embodiment of a pipe cutting device of the present invention.

FIG. 2 is an explanatory side view of FIG. 1;

FIG. 3a is an explanatory diagram of an operation state.

FIG. 3b is another explanatory diagram of the operating state.

FIG. 4 is an enlarged sectional view of the prior art. Reference Signs List 1 base 2 support 3 bearing 5 holder 6 insertion opening 7 pipe to be cut 7a coating 10a, 10b guide groove 11a, 11b moving body 12a, 12b pipe receiving roller 13a coating removal tool 15a, 15b cam 17 guide groove 18 cutting cutter 20 Moving body 25a, 25b Pipe fixing clamp

Claims (3)

(57) [Claims] 1. A pipe to be cut having a coating is fixed, and a coating removal tool is moved toward the pipe to be cut while rotating about the axis of the pipe with respect to the pipe to be cut. A pipe cutting method, comprising removing a predetermined width of the coating at a position in a circumferential direction, moving a cutting cutter, and cutting the pipe to be cut within the predetermined width. 2. A holding member inserted around the axis and rotated about the axis of the pipe to be cut, and a holder provided on the holding member so as to be able to advance and retreat in the radial direction and having a predetermined width on the outer peripheral surface. A film removing tool having a cutting cutter provided in the holder so as to be able to advance and retreat in the radial direction, and rotating the holder about the axis, in a direction of a pipe to be cut holding the film removing tool. By moving forward, the predetermined width of the coating of the pipe to be cut at the cutting position is removed in the circumferential direction, and the cutting cutter is advanced in the direction of the pipe to be cut to cut the pipe to be cut within the predetermined width. And a control device for performing drive control. 3. The pipe cutting apparatus according to claim 2, further comprising a pipe fixing clamp for holding and fixing the pipe to be cut at both ends.