JP6711257B2 - Pipe inner surface cutting device - Google Patents

Description

The present invention relates to a pipe inner surface cutting device for cutting the inner surface of a steel pipe or the like.

Usually, when caring for the inner surface of a steel pipe or the like (for example, removing inner surface flaws), a pipe inner surface cutting device for cutting the inner surface of the pipe is used.

As such a pipe inner surface cutting device, for example, Patent Document 1 discloses a device for cutting with a uniform cutting allowance while copying a cutting blade (bite) on the inner surface of the pipe.

However, the device described in Patent Document 1 is designed to cut the inner surface of the tube, which is a heavy object, with a non-rotating cutting blade while rotating the tube, so that it is necessary to increase the number of rotations of the tube. There is a problem that it is difficult, the cutting speed is limited, the cutting ability is low, the mechanism for rotating the pipe becomes large, and the device becomes large.

On the other hand, Patent Document 2 discloses a pipe inner surface cutting device that is small in size and enables high-speed cutting by rotating a cutting blade on the pipe inner surface.

FIG. 7 is a schematic diagram showing a pipe inner surface cutting device 10X disclosed in Patent Document 2 described above. As shown in FIG. 7, the pipe inner surface cutting device 10X is provided with a fixing device (not shown) for fixing the pipe 1, a boring bar 11 that can advance and retreat in the axial direction of the pipe 1, and a tip of the boring bar 11. A cutting head 12 that can be inserted into the pipe 1, and a feed device (not shown) that moves the cutting head 12 back and forth in the axial direction of the pipe 1 by moving the boring bar 11 back and forth in the axial direction of the pipe 1. A rotating device (not shown) is provided for rotating the cutting head 12 around the axis of the pipe 1 by rotating the boring bar 11 around the axis of the pipe 1.

A plurality of cartridges 13 that are movable toward the inner surface of the pipe 1 are arranged in the cutting head 12, and a cutting blade 14 that cuts the inner surface of the pipe 1 is provided on the peripheral surface of each cartridge 13. A plurality of guide rollers (first guides) whose circumferential surface is located on the radial center side (axial center side of the pipe 1) with respect to the cutting surface by the cutting blade 14 and which rolls in the circumferential direction while following the inner surface of the pipe 1. (Roller) 15 is installed.

A plurality of guide rollers (second guide rollers) 16 capable of rolling in the circumferential direction of the tube 1 are attached to the cutting head 12 so as to be able to project to the inner surface side of the tube 1.

Further, inside the cutting head 12, there is provided a working oil chamber 23 for applying a hydraulic pressure to the cartridge 13 toward the outside (the inner surface side of the pipe 1 ), and the working oil chamber 23 is provided with a working oil. A first hydraulic line 21 and a second hydraulic line 22, a hydraulic unit (not shown) for supplying hydraulic oil to the hydraulic oil chamber 23 via the first hydraulic line 21 and the second hydraulic line 22, and a first hydraulic line A rotary joint 27 that rotatably connects the pipe 21 (the hydraulic pipe on the hydraulic unit side) and the second hydraulic pipe 22 (the hydraulic pipe on the hydraulic oil chamber 23 side), and the rotary joint 27 inside the hydraulic oil chamber 23 in the axial direction of the pipe. A piston 25 whose end face faces and a spring 26 for urging the piston 25 toward the hydraulic oil chamber 23 side are installed.

JP-A-5-337707 JP, 2014-184497, A

Usually, a tolerance is provided for the dimensions of the steel pipe and the like, and a tolerance of ±3% is provided for the inner diameter of the steel pipe with respect to the nominal inner diameter. Therefore, for example, in the case of a steel pipe having a nominal inner diameter of 100 mm, there are steel pipes having an actual inner diameter of 97 mm to steel pipes having an actual inner diameter of 103 mm.

Therefore, when designing and manufacturing a pipe inner surface cutting device corresponding to a steel pipe having a nominal inner diameter of Amm, it is possible to cut the inner surface of the steel pipe having an actual inner diameter of A×0.97 mm to A×1.03 mm. It is necessary, and for that purpose, the movable range (possible stroke amount) in the radial direction of the cutting blade (cartridge) is required to be greater than or equal to a predetermined stroke amount (required stroke amount). Considering that there is a tolerance of ±3% with respect to the nominal inner diameter, the required stroke amount is about 1/15 (≈0.066) of the nominal inner diameter.

On the other hand, as a result of investigation by the present inventors, in the case of the pipe inner surface cutting device 10X described in Patent Document 2, the portion on which the hydraulic actuating force is applied to the cartridge 13 is the central portion of the cutting head 12 near the cartridge 13. Since the structure is arranged in the above, the required stroke amount can be secured only for steel pipes with a nominal inner diameter of 130 mm or more, and it is difficult to design and manufacture a small pipe inner surface cutting device that can handle steel pipes with a nominal inner diameter of less than 130 mm. I found out.

The present invention has been made in view of the above circumstances, and as a pipe inner surface cutting device for cutting the inner surface of a steel pipe or the like, it is possible to cut a small diameter pipe at a high speed with a smaller device as a pipe inner surface cutting device. It is an object of the present invention to provide a pipe inner surface cutting device which is capable of performing a stable copy of the shape and dimensions of the pipe inner surface and is excellent in processing accuracy.

As a result of intensive studies on the above problems, the inventors of the present invention have found that the pipe inner surface cutting device 10X described in Patent Document 2 includes a hydraulic oil chamber 23 at the center of the device as shown in FIG. It is noticed that a large space is required because the cartridge is caused to act on the cartridge 13 in the radial direction. Then, in order to solve the problem, an idea of a structure in which the hydraulic oil pressure for pressing the cartridge 13 against the inner surface of the pipe 1 is first acted in the axial direction and then changed in the radial direction was devised.

The present invention has the following features to realize the idea.

[1] tube and axially movable back and forth boring bar, insertable cutting head into said tube is attached to the tip of the boring bar, towards the inner surface of the tube is disposed in the cutting head a movable cartridge, said the cutting blade for cutting the inner surface of the installed pipe on the peripheral surface of the cartridge, peripheral to the center of the installed in the circumferential surface in the radial direction from the cutting surface by the cutting blade said cartridge A guide roller having a surface located therein and rolling in the inner surface of the pipe in the circumferential direction; a hydraulic oil chamber installed inside the cutting head for applying an outward operating force to the cartridge ; and the hydraulic oil chamber. And a hydraulic actuating force direction changing member installed at the tip of the piston. The hydraulic actuating force axially applied from the hydraulic oil chamber to the piston is applied to the hydraulic actuating force direction. by transmitting the cartridge is converted by changing member in the radial direction, the tube surface cutting apparatus characterized by operating the cartridge in a radial direction.

[2] The pipe inner surface cutting device according to [1], wherein the hydraulic actuating force direction changing member is a wedge.

[3] The pipe inner surface cutting device according to [1] or [2], wherein the cutting head includes a support roller that rolls the inner surface of the pipe in the axial direction of the pipe.

INDUSTRIAL APPLICABILITY The pipe inner surface cutting device according to the present invention is capable of cutting a small diameter pipe at a high speed with a smaller device, while stably following the shape and dimensions of the pipe inner surface, and cutting with excellent processing accuracy. You can

It is a schematic diagram which shows one Embodiment of this invention. It is a schematic diagram which shows the other example in one Embodiment of this invention. It is an AA detailed view in FIGS. It is a figure which shows the inner surface cutting state (copy cutting) of a flat tube. It is a figure which shows the inner surface cutting state (round cutting) of a flat tube. It is a figure which shows the pipe inner diameter range which became possible to cut by this invention. It is a schematic diagram which shows a prior art (patent document 2).

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram showing a pipe inner surface cutting device 10 according to an embodiment of the present invention. 3 is a detailed view taken along the line AA in FIG.

As shown in FIGS. 1 and 3, a pipe inner surface cutting device 10 according to an embodiment of the present invention includes a fixing device (not shown) for fixing the pipe 1 and an axial direction of the pipe 1 (hereinafter, simply referred to as “axial direction”). "), a cutting head 12 that is attached to the tip of the boring bar 11 and can be inserted into the pipe 1, and a cutting by moving the boring bar 11 back and forth in the axial direction of the pipe 1. A feed device (not shown) for moving the head 12 back and forth in the axial direction of the pipe 1, and a rotating device for rotating the cutting head 12 around the axial line of the pipe 1 by rotating the boring bar 11 around the axial line of the pipe 1 (Fig. (Not shown).

The cutting head 12 is provided with a plurality of (may be one) cartridges 13 that are movable toward the inner surface of the tube 1, and the inner surface of the tube 1 is cut on the peripheral surface of each cartridge 13. Cutting blade 14 and a plurality of rolling blades whose circumferential surface is located radially closer to the center side (axial center side of the tube 1) than the cutting surface by the cutting blade 14 and which rolls in the circumferential direction while following the inner surface of the tube 1. A guide roller (first guide roller) 15 is installed.

A plurality of guide rollers (second guide rollers) 16 capable of rolling in the circumferential direction of the tube 1 are attached to the cutting head 12 so as to be able to project to the inner surface side of the tube 1.

Further, inside the cutting head 12, a hydraulic oil chamber 23 for applying an operating force toward the outside (inner surface side of the pipe 1) to the cartridge 13 is provided for each cartridge. Supplying hydraulic oil to the hydraulic oil chamber 23 via the first hydraulic pipe 21 for supplying hydraulic oil and the second hydraulic pipe 22 branched by the number of cartridges, and the first hydraulic pipe 21 and the second hydraulic pipe 22. Rotary unit 27 for rotatably connecting a hydraulic unit (not shown), a first hydraulic pipe 21 (hydraulic pipe on the hydraulic unit side) and a second hydraulic pipe 22 (hydraulic pipe on the hydraulic oil chamber 23 side). And a piston 25 whose end face in the axial direction of the pipe faces the hydraulic oil chamber 23, and a hydraulic operating force direction changing member for converting the hydraulic oil pressure 41 acting in the axial direction accompanying the tip of the piston 25 into a radial direction. (Here, the wedge 26) and the spring 30 that works with the accompanying force 42 that pulls the cartridge 13 toward the center of the cutting head 12 are installed. As a result, the cartridge 13 can be moved back and forth toward the inner surface of the tube 1.

Thus, in this embodiment, as shown in FIG. 1, the hydraulic oil pressure 41 in the axial direction transmitted through the piston 25 is used as the operating force for the cartridge 26 to move radially outward by the wedge 26. There is. Further, the spring 30 constantly exerts a force on the cartridge 13 toward the center of the tube 1 in the radial direction, and the sliding surface of the wedge 26 and the sliding surface of the cartridge 12 are always in contact with each other with a constant force. It is possible to move the cartridge 12 with a high-speed response even when there is a change in the inner surface shape. At that time, the wedge angle of the wedge 26 is set to be 45°±5° with respect to the piston sliding direction (that is, the axial direction) in order to smoothly perform the radial movement of the cartridge 13. It is suitable. In order to obtain the above-mentioned high-speed response, it is necessary to set the spring size and spring constant such that the force 42 toward the center by the spring 30 at this time is in the range of about 1/5 to 1/2 of the hydraulic actuating force 41. It is suitable.

As described above, in this embodiment, the axial piston 25 and the wedge 26 are employed to axially shift the portion on which the hydraulic actuating force from the hydraulic oil chamber 23 is exerted, and the central portion of the cutting head 12 near the cartridge 13 By ensuring the space described above, it is possible to achieve a reduction in the radial dimension of the cutting head 12 (ensure a necessary stroke amount in a small diameter pipe).

In addition, here, the working oil is supplied to the working oil chamber 23 through the working oil passage formed by the first hydraulic pipe 21 and the second hydraulic pipe 22 arranged inside the boring bar 11, and the first hydraulic pressure A rotary joint 27 is arranged between the pipe 21 and the second hydraulic pipe 22, but instead of such a double pipe structure, as shown in FIG. It may be supplied to the chamber 23. That is, the boring bar 11 is divided into a rotating portion 11a and a non-rotating portion 11b to form a rotary joint 27, and the non-rotating portion 11b of the boring bar 11 is provided with a hydraulic oil supply port 28 and a hydraulic oil supply passage 29, and its operation. The hydraulic oil may be supplied to the hydraulic oil chamber 23 via the oil supply passage 29.

In short, the rotary joint 27 may be used to form the flow path of the working oil so that the cutting head 13 can rotate around the axis of the pipe 1.

Then, when the inner surface of the pipe 1 is cut using the pipe inner surface cutting device 10 configured as described above, the following procedure is performed.

(S1) First, the tube 1 is horizontally fixed and held by a fixing device.

(S2) Next, by using the hydraulic unit, the pressure 41 of the hydraulic oil in the hydraulic oil chamber 23 is lowered to be smaller than the accompanying force 42 of the spring 30 provided in the cartridges, so that each cartridge 13 is moved to the axis of the pipe 1. The cutting blades 14 are moved to the core side so that each cutting blade 14 does not contact the inner surface of the tube 1. At this time, the protrusion amount of the second guide roller 16 becomes the largest.

(S3) Next, the cutting head 12 attached to the tip of the boring bar 11 is inserted into the pipe 1 by the feeding device. At that time, the second guide roller 16 rolls in the circumferential direction of the pipe 1 to support the cutting head 12. When the cutting head 12 (cutting blade 14) is inserted to the tip of the pipe 1, the hydraulic unit is used to increase the pressure 41 of the hydraulic oil in the hydraulic oil chamber 23 to be larger than the accompanying force 42 of the spring 30. As a result, each cartridge 13 is moved to the inner surface side of the tube 1, and each cutting blade 14 is brought into a state capable of cutting the inner surface of the tube 1.

(S4) Next, the cutting device 12 is rotated around the axis of the pipe 1 via the boring bar 11 by the rotating device to start cutting the inner surface of the pipe 1 by the cutting blade 14. Here, since the first hydraulic pipe 21 (the hydraulic pipe on the hydraulic unit side) and the second hydraulic pipe 22 (the hydraulic pipe on the hydraulic oil chamber 23 side) are rotatably connected by the rotary joint 27, the cutting head It is possible to rotate 12 around the axis of the tube 1 without any trouble. Then, while rotating the cutting head 12 around the axis of the pipe 1 by the rotating device, the feeding device moves the cutting head 12 backward in the axial direction of the pipe 1 via the boring bar 11, so that the pipe by the cutting blade 14 is moved. 1 The inner surface is continuously cut.

At that time, since each cartridge 13 receives the same pressure from the hydraulic oil, each first guide roller 15 is pressed against the inner surface of the pipe 1 by the same pressure, and each cutting blade 14 is also pressed by the same pressure by the pipe 1. It begins to bite into the inside. As a result, the inner surface of the pipe 1 is cut with the same cutting allowance.

In each cartridge 13, the distance δ between the cutting surface of the cutting blade 14 and the peripheral surface of the first guide roller 15 serves as a cutting allowance for the inner surface of the pipe 1 by the cutting blade 14.

(S5) When the cutting head 12 (cutting blade 14) reaches the rear end of the pipe 1, the cutting of the inner surface of the pipe 1 by the cutting blade 14 is completed.

In this way, the pipe inner surface cutting device 10 in this embodiment is arranged such that the pipe 1 is fixed, the cutting blade 14 is rotated, and the guide roller 15 and the cutting blade 14 are aligned in the axial direction. In addition, by adopting the axial piston 25 and the wedge 26, it is possible to cut the inner surface of the pipe with excellent machining accuracy at a high speed of a small diameter pipe with a smaller device.

Further, the cutting head 12 may be provided with a support roller for rolling the inner surface of the tube 1 in the tube axis direction. By using this support roller when moving the cutting head 12 in the axial direction of the pipe 1 without cutting the inner surface of the pipe 1, the movement can be smoothed.

As described above, when the pipe inner surface cutting device 10 is used, the first guide roller 15 can perform cutting with the same cutting allowance while following the inner surface of the pipe 1. Therefore, as shown in FIG. Even if the cross section is flat (elliptical), it is possible to perform cutting with the cutting portion shape 2 that provides the same cutting allowance.

However, when the cross section of the tube 1 is flat (elliptical), each cartridge 13 is fixed to the cutting head 12 with a fixing bolt (not shown) or the like if necessary, and the first guide roller 15 causes the inner surface of the tube 1 to move. 5 is cut, it is possible to cut with the cutting portion shape 2 such that the inner surface of the tube 1 becomes a perfect circle, as shown in FIG.

By the way, in this embodiment, the wedge 26 is used as the hydraulic actuation force direction changing member, but another hydraulic actuation force direction changing member may be used. For example, a rack and pinion structure (axial movement rack, pinion, radial movement rack) can be used.

As an example of the present invention, a pipe inner surface cutting device 10 according to the embodiment of the present invention shown in FIG. 1 was designed. Further, as a conventional example, the pipe inner surface cutting device 10X described in Patent Document 2 was designed. Then, for each of the present invention example and the conventional example, the relationship between the nominal inner diameter of the pipe to be cut and the possible stroke amount was arranged. The result is shown in FIG.

As shown in FIG. 6, in the conventional example, as described in the section of [Problems to be Solved by the Invention], it is possible to secure the necessary stroke amount (1/15 of the nominal inner diameter) with a nominal inner diameter of 130 mm. In the case of the above-mentioned pipe, and in the case of the pipe having a nominal inner diameter of less than 130 mm, the required stroke amount could not be secured.

On the other hand, as shown in FIG. 6 as well, in the example of the present invention, in the case of the pipe having the nominal inner diameter of 80 mm or more, the possible stroke amount can secure the necessary stroke amount (1/15 of the nominal inner diameter). .. As a result, the range of small-diameter pipes that can be cut can be expanded.

Further, in the example of the present invention, the possible stroke amount is increased by about 20% as compared with the conventional example, which means that it becomes possible to cut a pipe having various inner diameters with one cutting head of a certain size. This means that the introduction cost can be reduced by reducing the number of cutting heads.

1 Pipe 2 Cutting Part Shape 10 Pipe Inner Surface Cutting Device 10X Pipe Inner Surface Cutting Device 11 Boring Bar 12 Cutting Head 13 Cartridge 14 Cutting Blade 15 First Guide Roller 16 Second Guide Roller 21 First Hydraulic Piping 22 Second Hydraulic Piping 23 Hydraulic Oil Chamber 25 Piston 26 Wedge (hydraulic actuating force direction changing member)
27 rotary joint 28 hydraulic oil supply port 29 hydraulic oil supply path 30 spring 41 hydraulic operating force 42 incidental force by spring

Claims (2)

A boring bar that can move back and forth in the axial direction of the pipe,
A cutting head attached to the tip of the boring bar and insertable into the tube;
A cartridge arranged in the cutting head and movable in the radial direction of the pipe;
A cutting blade installed on the outer peripheral surface of the cartridge to cut the inner surface of the tube,
A guide roller that is installed on the outer peripheral surface of the cartridge, has a peripheral surface located radially closer to the center side than the cutting surface by the cutting blade, and rolls the inner surface of the pipe in the circumferential direction.
A hydraulic oil chamber that is installed inside the cutting head and is supplied with hydraulic oil for applying an operating force to the cartridge toward the outside,
A piston that receives an axial hydraulic pressure from the hydraulic oil chamber,
A wedge that is a hydraulic actuating force direction changing member that is installed at the tip of the piston and converts the hydraulic pressure in the axial direction into a force in the radial direction ,
A spring that exerts an accompanying force that pulls the cartridge in the radial direction toward the central axis of the cutting head ,
The wedge has an inclined sliding surface that slides on the inner surface of the cartridge, and at the time of cutting, a hydraulic actuating force axially applied to the piston from the hydraulic oil chamber is applied to the wedge by the inclined surface of the wedge. A pipe inner surface cutting device, characterized in that the cartridge is operated in a radial direction by converting it into an operating force to the outer peripheral side and transmitting it to the cartridge. The pipe inner surface cutting device according to claim 1, wherein the cutting head includes a support roller that rolls the inner surface of the pipe in the axial direction of the pipe.

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