JP2013220499A - Cutting tool and cylindrical member removal method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting tool and a cylindrical member removal method capable of efficiently and surely removing a cylindrical member inserted into a tube from the inside of the tube.SOLUTION: A cutting tool 1 is the cutting tool 1 for cutting off a plug inserted into a copper tube connection port, and includes: a blade part 2 which has an outer diameter smaller than the inner diameter of the copper tube connection port and has a hollow cylindrical shape with a tip part opened; a stopper 4 provided on the opposite side of the tip part of the blade part 2 and projected more on a radial direction outer side than the inner diameter of the copper tube connection port to which the blade part 2 is inserted; and a vent hole 5 whose entrance part is positioned on the outside of the plug when the blade part 2 cuts off the plug, and which penetrates from the outside to the inside of the blade part 2.

Description

  The present invention relates to a cutting tool for cutting a cylindrical member inserted into a pipe and a cylindrical member removing method.

  As shown in FIG. 17, the compressor 10 provided in the outdoor unit of the air conditioner is provided with a copper pipe connection port 11 formed of a copper pipe in the case of the compressor 10 for connection to the refrigerant pipe. It is done. As shown in FIGS. 17 to 19, a synthetic rubber plug 12 is inserted into the copper pipe connection port 11 in order to prevent moisture from entering and to be waterproofed in relation to a refrigerant pipe (not shown). Refrigerant piping is provided through the axial portion of the plug 12, and the copper pipe connection port 11 is sealed by the plug 12.

  In patent document 1, it is invention of the resin cutter apparatus, Comprising: The technique which cut | disconnects and removes especially the resin adhering to cheese inside by the pipe line to which resin lining was given is disclosed. Further, Patent Document 2 is an invention of a drilling tool used for joining branch pipe joints. When a branch pipe is taken out from an existing main pipe through which a fluid such as gas flows, the branch pipe joint is A technique for drilling a main pipe with a cutter built in a branch pipe joint after joining the pipe is disclosed.

JP-A-10-151505 Japanese Utility Model Publication No. 61-27608

  At the time of maintenance of the compressor 10, the plug 12 inserted into the copper pipe connection port 11 of the case of the compressor 10 described above can usually be easily pulled out with a pliers 30 or the like as shown in FIG. However, when used for a long time, the plug 12 may adhere to the inner wall surface of the copper tube connection port 11 due to deterioration of the synthetic rubber. When the plug 12 is adhered, as shown in FIG. 21, as a result of being pulled by the pliers 30, the flange 12a of the plug 12 is torn and the main body portion of the plug 12 cannot be taken out. In this case, since there was no method for taking out the main body portion of the plug 12 in the copper pipe connection port 11, the entire compressor 10 had to be discarded.

  In particular, in a service department that conducts inspections and repairs of product manufacturers, etc., it is required to efficiently inspect and repair a large number of compressors. Therefore, it is required that time and labor are not required when the plug 12 in the copper tube connection port 11 is taken out.

  The present invention has been made in view of such circumstances, and provides a cutting tool and a cylindrical member removing method capable of efficiently and reliably removing a cylindrical member inserted into a pipe from the inside of the pipe. The purpose is to do.

In order to solve the above problems, the cutting tool and the cylindrical member removing method of the present invention employ the following means.
That is, the cutting tool according to the present invention is a cutting tool for cutting a cylindrical member inserted into a pipe, and has a hollow cylindrical shape having an outer diameter smaller than the inner diameter of the pipe and having an open end. A blade portion, a stop portion that is provided on the opposite side of the tip portion of the blade portion, protrudes radially outward from the inner diameter of the tube into which the blade portion is inserted, and the blade portion connects the cylindrical member. When cutting, the inlet portion is located outside the cylindrical member, and includes an opening that penetrates from the outside into the blade portion.

According to this invention, the blade portion has a hollow cylindrical shape, the tip portion of the blade portion is open, and has an outer diameter smaller than the inner diameter of the tube into which the rubber tubular member is inserted. Can be inserted inside the tube. And the cylindrical member inserted in the pipe | tube is cut | disconnected by the blade part penetrated. Since the blade portion has a flat plate or a cross-section that is not an arc shape but a cylindrical shape, it is difficult to bend when the blade portion is inserted or rotated inside the tube, and the tubular member can be reliably cut.
In addition, since the stopper part protrudes radially outward from the inner diameter of the pipe, when the blade part is inserted into the pipe, the stopper part abuts on the end of the pipe, and the blade part goes into the pipe more than necessary. Insertion can be prevented.
Furthermore, the opening part penetrates from the outside into the blade part, and when the blade part cuts the cylindrical member, the inlet part of the opening part is located outside the cylindrical member. Therefore, when the blade portion is inserted into the tube, the inside of the blade portion is sealed or semi-sealed, and the cylindrical member can be prevented from being pushed into the tube.

  In the above invention, the length of the blade portion from the tip portion to the stop portion is longer than the length of the cylindrical member inserted into the tube and in contact with the tube, and is formed on the tube and It is desirable that the length from the step portion having a diameter smaller than the inner diameter of the opening portion of the tube to the end portion of the tube is shorter.

  According to this invention, when the blade portion is inserted into the inside of the tube and the stop portion comes into contact with the end portion of the tube, the distal end portion of the blade portion is inserted deeper than the cylindrical member inserted into the tube. Thus, the cylindrical member can be cut reliably. In addition, when the stop portion comes into contact with the end portion of the tube, the tip end portion of the blade portion does not reach the step portion formed on the tube, so that only the tubular member is attached without damaging the step portion of the tube. Can be cut.

  Further, the cylindrical member removing method according to the present invention includes a blade portion having a hollow cylindrical shape having an outer diameter smaller than an inner diameter of a tube in which the cylindrical member is inserted, and an open end portion, and the blade A stop portion provided on the opposite side of the tip portion of the tube and projecting radially outward from the inner diameter of the tube, and the blade portion is positioned outside the tubular member when the blade member cuts the tubular member. A cylindrical member removing method using a cutting tool having an opening penetrating from the blade portion to the inside of the blade portion, and inserting the blade portion into the tube in which the tubular member is inserted; Abutting the stop with the end of the tube.

  In the above invention, the method may further include a step of inserting a brush rotating around an axis into the tube.

  According to this invention, after a cylindrical member is cut | disconnected by a blade part, the remaining part of the cylindrical member adhering to the pipe inner wall is peeled off with the brush inserted in the pipe | tube. By using a brush that rotates around the axis, the cylindrical member attached to the inner wall of the tube can be removed efficiently.

  According to the present invention, the blade portion is cylindrical, and the cylindrical member inserted into the tube can be efficiently and reliably removed from the inside of the tube by providing the stopper and the opening.

It is a perspective view showing a cutting tool concerning one embodiment of the present invention. It is a partial section perspective view showing the cutting tool concerning one embodiment of the present invention. It is a longitudinal section showing a cutting tool concerning one embodiment of the present invention. It is a perspective view which shows the cutting tool which concerns on one Embodiment of this invention, an adapter, and a T-shaped handle. It is a perspective view which shows a copper pipe connection port and a plug, FIG. 5 (A) shows the state by which the flange is hold | gripped with pliers, FIG.5 (B) shows the state by which the flange was cut | disconnected by the cutter. It is a perspective view which shows the cutting tool which concerns on one Embodiment of this invention, a copper pipe connection port, and a plug. It is a perspective view which shows the cutting tool which concerns on one Embodiment of this invention, and a copper pipe connection port. It is a perspective view which shows the cutting tool which concerns on one Embodiment of this invention, a copper pipe connection port, and a plug. It is a perspective view which shows the brush and adapter which concern on one Embodiment of this invention. It is a perspective view which shows the brush and copper pipe connection port which concern on one Embodiment of this invention. It is a perspective view which shows the thin tube and copper tube connection port which concern on one Embodiment of this invention. It is a longitudinal cross-sectional view which shows the modification of the cutting tool which concerns on one Embodiment of this invention. It is a perspective view which shows the modification of the cutting tool which concerns on one Embodiment of this invention, and a T-shaped handle. It is a longitudinal cross-sectional view which shows a deep socket. It is a perspective view which shows a deep socket. FIG. 16A is a plan view showing a tool support part of a cutting tool according to a reference example, and FIG. 16B is a longitudinal sectional view showing a cutting tool according to the reference example, and FIG. These are the top view and partial cross-sectional view which show the connection port support part of the cutting tool which concerns on a reference example. It is a side view which shows a compressor. It is a perspective view which shows the copper pipe connection port and plug of a compressor. It is a longitudinal cross-sectional view which shows the copper pipe connection port and plug of a compressor. It is a perspective view which shows the copper pipe connection port and plug of a compressor. It is a perspective view which shows the copper pipe connection port and plug of a compressor.

Embodiments according to the present invention will be described below with reference to the drawings.
First, the compressor 10 to which the cutting tool 1 which concerns on one Embodiment of this invention is applied is demonstrated.
The cutting tool 1 is used when removing rubber parts adhered to the inside of the pipe material from the opening of the pipe material, and in particular, removing the plug 12 inserted into the copper pipe connection port 11 provided in the compressor 10. Suitable for The compressor 10 is provided in an outdoor unit of an air conditioner, for example.

  As shown in FIG. 17, the copper pipe connection port 11 is a pipe formed of a copper pipe for connection to the refrigerant pipe, and is provided on the outer surface of the case of the compressor 10. The diameter of the copper tube connection port 11 is, for example, not less than about 6 mm and not more than about 13 mm. A plug 12 is inserted into the copper pipe connection port 11 in order to prevent moisture from entering and waterproof due to a refrigerant pipe (not shown). Refrigerant piping is provided through the axial portion of the plug 12, and the copper pipe connection port 11 is sealed by the plug 12.

  The plug 12 is made of synthetic rubber, and is inserted into the copper tube connection port 11 so as to be in close contact with the inner wall of the copper tube connection port 11 as shown in FIGS. As shown in FIG. 19, the plug 12 is provided with a flange 12a at one end. The outer diameter of the flange 12 a is larger than the outer diameter of the copper tube connection port 11, and when the plug 12 is inserted into the copper tube connection port 11, the flange 12 a is located outside the copper tube connection port 11. The through-hole 12b is provided in the axial part of the plug 12, and refrigerant | coolant piping is installed in the through-hole 12b.

Next, the structure of the cutting tool 1 which concerns on this embodiment is demonstrated.
As shown in FIGS. 1 to 3, the cutting tool 1 includes a blade portion 2, a connection portion 3, a stopper 4, a vent hole 5, and the like.

  For example, as shown in FIG. 4, the cutting tool 1 is attached to a T-shaped handle 14 via an adapter 13. The adapter 13 has a male screw part 13a at one end and a socket (insertion angle) 13b at the other end. The T-shaped handle 14 has a convex portion (drive angle) 14b at one end portion of the shaft portion 14a, and a handle 14c at the other end portion of the shaft portion 14a. The socket 13 b of the adapter 13 corresponds to the convex portion 14 b of the T-shaped handle 14. The convex portion 14b is inserted into the socket 13b, and the adapter 13 and the T-shaped handle 14 are integrated.

  As shown in FIG. 4, the T-shaped handle 14 has a shaft portion 14d shorter than the shaft portion 14a, and various types such as a rod-shaped handle 14c that moves in the axial direction of the handle 14c. Can be used. A commercially available product can be used as the T-shaped handle 14. Further, the shaft portion of the T-shaped handle 14 may be divided into two parts and connected to each other via a bevel gear or the like to refract the shaft portion. Thereby, the insertion direction of the blade part 2 and the rotation axis direction in the handle of the T-shaped handle can be made different, and the workability by the worker can be improved.

  The blade part 2 is made of steel (carbon steel S45C or the like), for example. The blade part 2 has an outer diameter smaller than the inner diameter of the copper pipe connection port 11 into which the plug 12 is inserted. For example, the blade portion 2 has an outer diameter that is smaller by 0.2 mm to 0.4 mm than the inner diameter of the copper tube connection port 11. Thereby, the blade part 2 can be inserted into the copper tube connection port 11.

  The blade part 2 has a hollow cylindrical shape with an open end. The thickness of the blade part 2 is, for example, 0.5 mm. Since the blade portion 2 has a cylindrical shape, it slides inside the copper tube connection port 11 along the inner wall surface of the copper tube connection port 11. Since the blade portion 2 is hollow, the plug 12 can be cut into a cylindrical shape, and the cut plug 12 is accommodated inside the blade portion 2.

  As shown in FIG. 3, the tip portion 2 a of the blade portion 2 may be formed with a slope inclined in the axial direction of the blade portion 2. As a result, the plug 12 adhered to the inner wall of the copper tube connection port 11 can be cut as if it were scraped.

  The connecting portion 3 is provided on the opposite side of the cutting tool 1 from the tip portion 2a of the blade portion 2, for example, adjacent to the blade portion 2. The connection part 3 is cylindrical shape, for example. The connecting portion 3 is formed with a female screw portion 3a at the axial portion. The female screw portion 3 a is formed in the axial direction of the connection portion 3. The female screw portion 3a corresponds to the male screw portion 13a of the adapter 13, and both can be screwed together. The internal thread part 3a and the external thread part 13a are combined, and the cutting tool 1 and the adapter 13 are integrated.

  Since the outer diameter of the connection portion 3 is larger than the outer diameter of the blade portion 2, a step portion is formed at the boundary between the connection portion 3 and the blade portion 2, and the step portion constitutes a stopper 4.

  The stopper 4 is located on the side opposite to the tip 2 a of the blade 2 with respect to the main body of the blade 2. The stopper 4 protrudes radially outward from the inner diameter of the copper tube connection port 11 into which the blade portion 2 is inserted. That is, the outer diameter of the stopper 4 is larger than the inner diameter of the copper pipe connection port 11. Thereby, when the blade portion 2 is inserted into the copper tube connection port 11, the stopper 4 comes into contact with the end portion of the copper tube connection port 11. As a result, it is possible to prevent the blade part 2 from being inserted into the copper pipe connection port 11 more than necessary.

  As shown in FIG. 19, the copper tube connection port 11 is formed with a tube expansion portion 11 a within a predetermined length from the opening. Moreover, in the copper pipe connection port 11, the diameter of the case side of the compressor 10 is narrower than the pipe expansion part 11a rather than the pipe expansion part 11a. Therefore, the copper pipe connection port 11 has a step portion.

  The length L1 (see FIG. 3) from the tip 2a of the blade portion 2 to the stopper 4 is the length L2 of the plug 12 inserted into the copper tube connection port 11 and in contact with the copper tube connection port 11 (FIG. 19). Longer than the reference) and shorter than the length L3 (see FIG. 19) of the expanded portion 11a. Therefore, when the blade portion 2 is inserted into the copper tube connection port 11 and the stopper 4 comes into contact with the end portion of the copper tube connection port 11, the distal end portion 2 a of the blade portion 2 is in the copper tube connection port 11. Since the plug 12 is inserted deeper than the inserted plug 12, the plug 12 can be reliably cut. Further, when the stopper 4 comes into contact with the end of the copper tube connection port 11, the tip 2 a of the blade portion 2 does not reach the stepped portion formed in the copper tube connection port 11. Only the plug 12 can be cut without damaging the step portion.

  The vent hole 5 is formed in the connection portion 3. The opening direction of the vent hole 5 is, for example, a direction perpendicular to the axial direction of the connection portion 3. The vent hole 5 penetrates from the outside to the internal thread portion 3a formed inside the connection portion 3. The vent hole 5 may be provided only at one place in the connecting portion 3 or may be provided at two or more places. As shown in FIG. 3, when two vent holes 5 are provided to face each other, one rod-like member (not shown) can be passed through the two vent holes 5. Thereby, the rod-shaped member which penetrated the two ventilation holes 5 can be used as a handle instead of the T-shaped handle 14.

  The female screw portion 3a penetrates from one end of the connection portion 3a to the inside of the blade portion 2. Further, the inlet portion of the vent hole 5 is located outside the plug 12 when the blade portion 2 cuts the plug 12. Therefore, by forming the vent hole 5 and the female screw portion 3a, the opening portion penetrates from the outside of the cutting tool 1 to the hollow interior of the blade portion 2, and the air inside the hollow portion of the blade portion 2 is extracted to the outside. Can do.

  When the T-shaped handle 14 is attached to the cutting tool 1, the female thread portion 3a of the cutting tool 1 is in a closed state. Therefore, when the plug 12 is cut while the blade portion 2 is inserted into the copper tube connection port 11, the interior of the cutting tool 1 is sealed or semi-sealed if there is no vent hole 5. As a result, the cut plug 12 is pushed into the copper tube connection port 11 by the air pressure inside the cutting tool 1. On the other hand, by providing the vent hole 5 as in this embodiment, the cutting tool 1 is not sealed or semi-sealed, and the cut plug 12 is accommodated in the hollow portion of the blade portion 2. Is done. Therefore, the plug 12 can be prevented from being pushed into the copper pipe connection port 11.

Next, a method for removing the plug 12 using the cutting tool 1 according to the present embodiment will be described.
First, the cutting tool 1 is selected according to the inner diameter of the copper pipe connection port 11 into which the plug 12 is inserted. As the cutting tool 1, one having a blade portion 2 having an outer diameter that can be inserted into the copper pipe connection port 11 is selected. The selected cutting tool 1 is attached to the T-shaped handle 14 via the adapter 13.

  As a preparatory stage for inserting the cutting tool 1 into the copper pipe connection port 11, as shown in FIG. 5A or FIG. 5B, the flange 12 a of the plug 12 inserted into the copper pipe connection port 11 is connected to the pliers 30. Or it is removed by the cutter 31. Accordingly, the blade portion 2 can be inserted into the copper tube connection port 11 through the opening of the copper tube connection port 11 as shown in FIG. 6 without the blade portion 2 being inserted through the thickness of the flange 12a. Become.

  Next, the cutting tool 1 is inserted into the copper pipe connection port 11. At this time, as shown in FIG. 7, the blade portion 2 rotates while being pressed by the T-shaped handle 14, whereby the blade portion 2 cuts the plug 12 inserted into the copper tube connection port 11. Then, the cutting with the cutting tool 1 is continued until the stopper 4 comes into contact with the end of the copper pipe connection port 11. At this time, the cut plug 12 is accommodated in the hollow portion of the blade portion 2. When the stopper 4 comes into contact with the end of the copper tube connection port 11, the blade portion 2 cannot be inserted into the copper tube connection port 11, and the pressing and rotation by the cutting tool 1 are terminated.

  When the stopper 4 comes into contact with the end portion of the copper tube connection port 11, the distal end portion 2 a of the blade portion 2 is inserted deeper than the plug 12 inserted into the copper tube connection port 11. Further, when the stopper 4 comes into contact with the end portion of the copper tube connection port 11, the tip portion 2 a of the blade portion 2 does not reach the stepped portion formed in the copper tube connection port 11.

  Thereafter, as shown in FIG. 8, the T-shaped handle 14 is pulled, and the cutting tool 1 is pulled out from the copper tube connection port 11. As a result, the plug 12 inserted into the copper pipe connection port 11 is removed from the copper pipe connection port 11.

  After the plug 12 cut by the blade portion 2 is pulled out from the inside of the copper tube connection port 11, the remaining part of the plug 12 is adhered to the inner wall of the copper tube connection port 11, and the plug 12 is completely removed. Not finished. Therefore, the remaining plug 12 is removed using the brush 15 shown in FIG.

  The brush 15 in which the bristle portion is formed in a cylindrical shape is used by being rotated around an axis by a drill tool (not shown). The drill tool rotates using electricity or compressed air as a power source. FIG. 9 shows an example of the brush 15 and an adapter for attaching the brush 15 to the drill tool. The adapter is, for example, a brush adapter 16, a flexible adapter 17, and a drill chuck adapter 18 that are coupled in order. The brush 15 is connected to the drill tool through these adapters.

  As shown in FIG. 10, the brush 15 is rotated around the axis by a drill tool and pressed against the plug 12 attached to the inner wall of the copper tube connection port 11, whereby the plug 12 can be quickly removed.

  Next, as shown in FIG. 11, the thin tube 33 is inserted into the copper tube connection port 11, and air is blown from the inside to the outside of the copper tube connection port 11, so that scraps such as cutting pieces of the plug 12 are removed from the outside. To remove.

  As described above, according to the method for removing the plug 12 using the cutting tool 1 according to the present embodiment, the cutting tool 1, the brush 15 and the air blow adhered to the inside of the copper pipe connection port 11 without taking time and effort. The plug 12 can be removed.

  Next, a cutting tool 41 which is one of the modified examples of the present embodiment will be described with reference to FIGS. The cutting tool 1 described above is connected to a T-shaped handle 14 via an adapter 13. Therefore, in the cutting tool 1, a female screw portion 3 a is formed corresponding to the male screw portion 13 a of the adapter 13.

  On the other hand, the cutting tool 41 has the blade part 2, the connection part 43, the stopper 44, the vent hole 5, etc., as shown in FIG. Since the outer diameter of the connecting portion 43 is larger than the outer diameter of the blade portion 2, a step portion is formed at the boundary between the connecting portion 43 and the blade portion 2, and the step portion constitutes a stopper 44. The connection portion 43 has a socket (insertion angle) 43a at the axial portion at the end opposite to the blade portion 2. The socket 43a of the cutting tool 41 corresponds to the convex portion (drive angle) 14b of the T-shaped handle 14.

  As shown in FIG. 13, the convex part 14b of the T-shaped handle 14 is inserted into the socket 43a, and the cutting tool 41 and the T-shaped handle 14 are integrated. Thereby, the cutting tool 41 and the T-shaped handle 14 can be connected without using the adapter 13.

  The cutting tool 41 is manufactured from, for example, a deep socket 51 of a commercially available socket wrench as shown in FIGS. The outer peripheral part of the deep socket 51 is cut, and the blade part 2 and the vent hole 5 are formed. At this time, the socket portion originally formed in the deep socket 51 is left as the socket 43 a of the cutting tool 41. Accordingly, the cutting tool 41 having the socket 43a can be easily manufactured without newly forming the socket 43a that is difficult to form by machining. In the example shown in FIG.12 and FIG.14, it has shown about the case where the cutting tool 41 whose outer diameter of the blade part 2 is about 9 mm is manufactured from the deep socket 51 of outer diameter 14.7mm and inner diameter 8mm. By using a deep socket 51 of another size, it is possible to manufacture a cutting tool 41 in which the outer diameter of the blade portion 2 is different from the example of FIG.

Hereinafter, the effects of the present embodiment will be described with reference examples.
As shown in FIG. 16, the cutting tool 21 according to the reference example includes a blade part 22, a connection part 23, a stopper 24, a connection port support part 25, a tool support part 26, a fixing part 27, and the like. Prepare. Unlike the blade portion 2 of the present embodiment, the blade portion 22 has a long plate shape or a circular arc shape in cross section. The blade portion 22 is provided at the tip of the connection portion 23, and the connection portion 23 rotates around the axis within the opening of the tool support portion 25. The connection port support portion 25, the tool support portion 26 and the fixing portion 27 are integrated by a fixing screw, and the connection portion 23 of the cutting tool 21 can rotate around the axis line in accordance with the axis line of the copper tube connection port 11.

  The stopper 24 is provided in the connection portion 23, and the stopper 24 abuts on the tool support portion 26 when the blade portion 22 is inserted into the copper tube connection port 11. As a result, it is possible to prevent the blade part 2 from being inserted into the copper pipe connection port 11 more than necessary. When the stopper 4 comes into contact with the end of the copper tube connection port 11 by adjusting the distance between the connection port support 25 and the tool support 26 and the length from the tip 2a of the blade 2 to the stopper 4 Only the plug 12 can be cut without damaging the stepped portion of the copper tube connection port 11.

  However, since the blade portion 22 of the cutting tool 21 of the reference example has a long plate shape or an arc shape in cross section, when the plug 12 is hard, the blade portion 22 bends and the blade portion 22 is inserted into the plug 12 well. Or it does not rotate along the inner wall of the copper tube connection port 11. On the other hand, according to the present embodiment, the cross section of the blade portion 2 is circular, and is difficult to bend when inserted into the plug 12 or rotated inside the copper tube connection port 11. Accordingly, the plug 12 can be reliably cut without bending the blade portion 2, and the synthetic rubber plug 12 inserted into the copper pipe connection port 11 can be efficiently and reliably removed from the copper pipe connection port 11. Can do.

1,21,41 Cutting tool 2,22 Blade 2a Tip 3,23,43 Connection 4,24,44 Stopper
5 Vent (opening)
10 Compressor 11 Copper pipe connection port (pipe)
11a Tube expansion part 12 Plug (tubular member)
13 Adapter 14 T-shaped handle 15 Brush 16 Brush adapter 17 Flexible adapter 18 Drill chuck adapter 25 Connection port support part 26 Tool support part 27 Fixing part

Claims (4)

A cutting tool for cutting a cylindrical member inserted into a pipe,
A blade portion having a hollow cylindrical shape having an outer diameter smaller than the inner diameter of the tube and having an open end;
A stopper provided on the opposite side of the tip of the blade and protruding outward in the radial direction from the inner diameter of the tube into which the blade is inserted;
When the blade section cuts the tubular member, the inlet portion is located outside the tubular member, and an opening that penetrates from the outside to the inside of the blade section;
A cutting tool comprising:   The length of the blade portion from the tip portion to the stop portion is longer than the length of the cylindrical member inserted into the tube and in contact with the tube, and is formed in the tube and is an opening portion of the tube The cutting tool according to claim 1, wherein the cutting tool is shorter than the length from the stepped portion having a diameter smaller than the inner diameter of the tube to the end of the tube. A tubular member having a hollow cylindrical shape having an outer diameter smaller than the inner diameter of the tube inserted therein and having an open end, and provided on the opposite side of the distal end of the blade; A stopper projecting radially outward from the inner diameter of the blade, and an opening located outside the tubular member when the blade cuts the tubular member and penetrating from the outside into the blade. A cylindrical member removal method using a cutting tool having,
Inserting the blade portion into the tube into which the tubular member is inserted;
Contacting the stop with the end of the tube;
A cylindrical member removing method including: A cylindrical member removing method further comprising a step of inserting a brush rotating around an axis into the tube.

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