JPH04354613A - Method and device for pipe cutting - Google Patents

Abstract

PURPOSE:To obtain a beautiful cut surface free from the bulging-up and burrs of a film at the cut end of a pipe having a film by removing the film on the pipe to be cut by a film removing tool and cutting the pipe by a cutter. CONSTITUTION:A pipe 7 to be cut which has a film is fixed, and a film removing tool 13a is shifted toward the pipe 7 to be cut through the revolution around the axis center of the pipe, and the film at a cut position is removed in a prescribed width in the circumferential direction. Then, the pipe is cut in the prescribed width where the film of the pipe 7 to be cut is removed, by shifting a cutter 18.

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 device, and more particularly to a pipe cutting method and a pipe cutting device for pipes having a coating.

0002

[Prior Art] In the conventional pipe cutting method, a cutting cutter is provided on a holder that rotates around the axis of the pipe to be cut.
The cutter was used to cut the main body of the pipe without removing the coating on the pipe.

0003

[Problems to be Solved by the Invention] When cutting a pipe with a coating using a conventional pipe cutting method, if the coating is relatively thick and soft like a resin coating, the coating will be pushed in near the cut surface during cutting. As shown in FIG. 4, a raised portion 1 and a burr portion 2 are generated near the cut surface.

[0004] As described above, when cutting a pipe with a coating, if the coating is not cut cleanly near the cut surface and a raised part 1 or burr part 2 occurs, it will be difficult to perform end processing such as double flare processing or single flare processing. High-quality pipes could not be obtained, and especially in the case of flared products, burrs were trapped on the sheet surface, causing leakage problems.

The present invention has been made in view of the current state of cutting pipes having coatings as described above, and its purpose is to provide a pipe cutting method and apparatus that can cleanly cut pipes having coatings such as resin. It is about providing.

[0006]

[Means for Solving the Problems] 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 the axis of the pipe is set relative to the pipe to be cut. The coating removal tool is moved toward the pipe to be cut while rotating around the center to circumferentially remove a predetermined width of the coating at the cutting position, and the cutter is moved to remove the pipe from the pipe to be cut. The structure is such that the removed film is cut within a predetermined width.

[0007] In order to achieve the above object, a second embodiment of the present invention includes a holder which is inserted into the axial position of the holder and rotated around the axial center of the pipe to be cut, which is fixed;
A coating removing tool is provided on the holding body so as to be movable in the radial direction and has a predetermined width on the outer circumferential surface; a cutting cutter is provided on the holding body so as to be movable in the radial direction; The coating removal tool rotates around the center and advances in the direction of the pipe to be cut to remove a predetermined width of the coating of the pipe to be cut at the cutting position in the circumferential direction, and moves the cutting cutter in the direction of the pipe to be cut. and a control device that performs drive control so as to move the pipe forward and cut the pipe to be cut within a predetermined width of the removed coating.

[0008]

[Function] In the present invention, a pipe to be cut is fixed, and a coating removal tool provided on a holder that rotates around the axis of the pipe moves in the direction of the axis along an 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 in a predetermined width by the tool.

[0009]Substantially at the same time as or after the removal of this coating,
A cutting cutter provided on the rotating holder moves forward in the axial direction with respect to the pipe to be cut, and cuts the pipe having a predetermined width from which the coating has been removed, thereby producing a pipe having a coating. , cut with a clean cut surface.

0010

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

FIG. 1 is an explanatory front view showing the configuration of the main parts of an embodiment of the pipe cutting device, FIG. 2 is an explanatory side view showing the structure of the main parts of the embodiment of the pipe cutting device, FIGS. 3a and 3b FIG. 2 is an explanatory diagram showing the operation of an embodiment of the pipe cutting device.

As shown in FIG. 1, a support 2 is attached to a base 1.
is fixed, and a holder 5 is rotatably attached to this 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 of the holder 5 . Further, a pulley 8 is fixed to one end of the holder 5 and is connected to a drive motor of a control device (not shown) by a belt.

Further, guide grooves 10a and 10b are formed in the other end of the holding body 5 in the radial direction, and movable bodies 11a and 11b are respectively fitted into these guide grooves so as to be movable forward and backward in the radial direction. ing. Pipe receiving rollers 12a and 12b are fixed to the tips of the movable bodies 11a and 11b, respectively, and the pipe receiving roller 12a is equipped with a coating removal tool 13a, such as a cutting tool, having a predetermined width on the outer peripheral surface.
is fixed with the tip protruding.

The aforementioned movable bodies 11a and 11b are moved by guide grooves 10a and 10b by cams 15a and 15b, respectively.
These cams are configured to be driven and controlled by a control device (not shown).

Furthermore, a guide groove 17 is formed in the other end of the holding body 5 in the radial direction, and a movable body 20 having a cutting cutter 18 rotatably fixed to the tip thereof is inserted in the guide groove 17 in the radial direction. It is fitted so that it can move forward and backward. The movable body 20 is driven forward and backward along the guide groove portion 17 by a cam 21.

On the other hand, pipe fixing clamps 25a and 25b are provided to hold and fix both ends of the pipe to be cut 7 inserted into the insertion opening 6 of the holder 5, and these pipe fixing clamps can be clamped or unclamped. This is configured to be performed by a control device (not shown).

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

The holding body 5 is
A pipe 7 to be cut, having a coating 7a made of, for example, a resin material, is fed into the insertion opening 6 until the cut point is opposed to the cutting cutter 18 and the coating removal tool 13a.

When the pipe 7 to be cut is sent to this predetermined position, the control device starts operating and the pipe fixing clamps 25a, 25b hold and fix the pipe 7 to be cut, and the pipe 7 to be cut is held against the holder 5. It is positioned and 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), causing the holder 5 to rotate.

Next, the cams 15a and 15b are driven,
The movable bodies 11a and 11b start moving forward along the guide grooves 10a and 10b in the axial direction of the holding body 5, and the coating 7a of the pipe 7 to be cut is removed by the coating removing tool 13a at the cutting point as shown in FIG. 3a. It is removed by a predetermined width. Here, the coating removal tool 13a can adjust the protrusion length from the pipe receiving roller 12a according to the thickness of the coating 7a of the pipe 7 to be cut, so that the coating removal tool 13a has a preset protrusion length. 13a, the coating 7a at the cut location is neatly removed in a predetermined width.

Furthermore, the cam 21 causes the movable body 20 to move toward the holding body 5.
The cutting cutter 18 cuts the pipe 7 within the predetermined width. At this time, as described above, the coating 7a on the cut portion of the pipe 7 to be cut has already been removed by the coating removal tool 13a, so there is no bulge or rolled-up portion of the coating 7a near the cut surface, resulting in high quality. A cut pipe is obtained.

When the cutting is completed, the control device activates the cam 1.
5a, 15b, 21 are driven, moving bodies 11a, 11b
, 20 move, and the pipe receiving rollers 12a, 12b and the cutting cutter 18 return to their original positions. The pipe to be cut that has been cut to a predetermined length is taken out, but if the pipe to be cut 7 has a cut location, the pipe to be cut 7 is transferred to the cutting cutter 1 by a pipe feeding device (not shown).
8 and the coating removal tool 13a. The pipe 7 to be cut is then cut in the same manner as described above.

When all 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 explained above, according to the embodiment,
For example, when cutting a pipe 7 to be cut having a resin coating 7a, a high-quality cut pipe having a coating can be obtained without producing a raised portion or a rolled-up portion of the coating 7a near the cut surface.

[0025] In the embodiment, a case has been described in which one film removal tool is provided, but the present invention is not limited to the embodiment, and for example, a plurality of film removal tools may be provided.

[0026]

[Effects of the Invention] In the present invention, the coating on the pipe to be cut is removed using the coating removing tool, and the pipe is cut using the cutting cutter, so that there is no buildup of the coating or burrs in the vicinity of the cut surface. A high quality coated cut pipe with a clean cut surface can be obtained.

[Brief explanation of 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 operating state.

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

FIG. 4 is an enlarged sectional view of the prior art. 1 base 2
Support body 3 Bearing 5 Holding body 6 Insertion opening 7 Pipe to be cut 7a Coatings 10a, 10b Guide grooves 11a, 11b Moving bodies 12a, 12b Pipe receiving rollers 13a Film removal tools 15a, 15b Cam 17 Guide groove 18 Cutting cutter 20 Moving body

Claims (3)

[Claims] Claim 1: Fixing a pipe to be cut having a coating,
moving a coating removal tool toward the pipe to be cut while rotating around the axis of the pipe to remove a predetermined width of the coating at the cutting position in the circumferential direction; . A pipe cutting method, comprising moving a cutting cutter to cut the pipe to be cut within the predetermined width. 2. A holder that is inserted into the axial center position and rotated around the axis of the pipe to be cut that is fixed, and a holder that is provided on the holder so as to be movable in the radial direction and has a predetermined width on the outer peripheral surface. a cutting cutter provided on the holding body so as to be movable in a radial direction; and a cutting cutter that rotates the holding body around the axis and moves the coating removal tool in the direction of the held pipe to be cut. moving the cutter forward to remove a predetermined width of the coating of the pipe to be cut in the circumferential direction at the cutting position, and moving the cutting cutter forward in the direction of the pipe to be cut to cut the pipe to be cut within the predetermined width. A pipe cutting device characterized in that it has a control device that performs drive control. 3. The pipe cutting device according to claim 2,
A pipe cutting device comprising a pipe fixing clamp that holds and fixes a pipe to be cut at both ends.