JP3503585B2 - Flat plate curved section cutting method and flat plate curved section cutting disk cutter 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 flat plate curved portion cutting method and a flat plate curved portion cutting disk cutter device, which are effective for cutting work in a radiation control area of a nuclear facility.

[0002]

2. Description of the Related Art In a cutting operation in a radiation control area of a nuclear facility, chips are generated by a cutting method using a normal cutting tool or the like. The equipment near the core is often activated, and the chips are radioactive waste, so the generation of chips is not preferable. Further, in the thermal cutting of gas, laser, etc., molten metal is generated as so-called dross, which becomes radioactive waste similarly to the chips of mechanical cutting.

In addition, a device using a lip seal,
For example, in a shield plug in a thermonuclear fusion reactor, the cut portion needs to be re-welded, but for welding, the cut portion needs to be groove-processed. A separate processing machine is required.

On the other hand, the disc cutter has an advantage that cutting can be performed without generating chips unlike other mechanical cutting methods. The principle of this disk cutter is that as shown in FIG. 9A, a load is applied to a cutter blade K to press it against an object to be cut, for example, a flat plate P, so that the flat plate P is plastically deformed, and at the same time, as shown in FIG. 9B. By applying a propulsive force and rotating the cutter blade K, a flat plate P is formed in the cutter blade advancing direction.
This is to promote the plastic deformation of. Although the amount of plastic deformation at one time is small (about 0.1 mm), the flat plate P can be cut by performing it several tens of times. Since the disk cutter cuts the object to be cut by plastic deformation in this way, no chips are generated, and since the cutting surface is V-shaped, the cutting surface can be directly used as a groove. Therefore, by using the disk cutter for cutting the equipment near the core, there is an advantage that radioactive waste is not generated and a groove processing machine is not required.

By the way, the disk cutter can cut only linearly because of the shape of the cutter blade K, and is not suitable for cutting a curved portion. FIG. 10 shows a curved line cutting line L having a constant radius.
2 shows the relationship between the step surface shape of the cutter blade K and the curved line cutting line L when the conventional disk cutter is arranged.
When the conventional cutter blade K of the disc cutter is cut into the curved line cutting line L, the cutting edge of the cutter blade K and the curved line cutting line L are deviated from each other. K
It can be seen that the cutting line L and the curved line contact each other and a lateral load is applied to the cutter blade K. Since the pressing force requires a pressing force of about 1 ton, the thin cutter blade K will be damaged.

[0006]

Therefore, according to the present invention, not only is there no generation of chips, the cutting surface can be formed into a smooth V shape, and the groove processing is not required, and the cutter blade is laterally loaded. (EN) A flat plate curved portion cutting method and a flat plate curved portion cutting disk cutter device capable of stably and accurately cutting a flat curved portion without damaging a thin cutter blade without causing damage. .

[0007]

According to the method of cutting a curved portion of a flat plate of the present invention for solving the above problems, when a curved portion of a flat plate is cut at a constant radius, an arc is made at a constant radius position with respect to the center point of the curved portion .
A cylinder is provided in a cutter holder provided below the tip of the cylinder with a certain angle of inclination with respect to the flat plate , and the inclination angle and the angle formed by the cylinder central axis and the flat plate are maintained at the same angle.
Push the rudder with the compressor installed above the tip of the arm.
The cutter blade is fixed concentrically to the flat plate contact point of the cylinder by tilting it so that it is perpendicular to the flat plate, and this cutter blade is driven around the center point of the curved portion via the arm.
Ca at Rutotomoni the compressor is revolved by rotation mechanism
It is characterized in that a cutter blade is vertically pressed against a flat plate through a cutter holder to rotate the flat plate, and the flat plate is cut into a constant radius by plastic deformation to cut a curved portion.

One of the flat plate curved portion cutting disk cutter devices of the present invention used in the above flat plate curved portion cutting method is an arm which is rotated by a drive mechanism standing on a fixed base, and a lower end portion of the arm. a cutter holder which is pressed downward by the tip top of the compressor is provided, it is inclined at an angle with respect to the rotation center position of the arm on the fixing base to the cutter holder, the inclination angle and the cylindrical center
Set the angle between the shaft and the flat plate on the extended horizontal plane of the fixed base.
A cylinder that is held at the same angle and is pivotally supported, a disc cutter that is concentrically fixed to the cylinder , and the disc cutter
It is composed of a cutter blade concentrically provided and inclined so as to be perpendicular to a flat plate on an extended horizontal plane of the fixed base.

Another one of the disk cutter devices for cutting a flat curved portion of the present invention is a drive mechanism fixed to the base surface of an arm, a compressor provided in the middle of the arm and at the tip of the arm, and these compressors. and the cutter holder of the arm base end side and the arm distal end side is attracted, is inclined at respective predetermined angles with respect to the arm rotation center position in the flat plate and the same plane bent portion cut at the tip of both the cutter holder, that
Make the same angle between the tilt angle and the center axis of the cylinder and the flat plate
A cylinder that is held and pivoted, a disc cutter that is concentrically fixed to each of these cylinders, and an integral body of both disc cutters
A cutter blade that is concentrically provided with the cutter blade that is tilted so as to be perpendicular to the flat plate that cuts the curved portion, and the arm base end side and the arm front end side at the compressor position on the opposite side of both disk cutters so as to sandwich the flat plate. And a reaction force roller provided in the.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a flat plate curved portion cutting method and a flat plate curved portion cutting disk cutter device of the present invention will be described. First, a disk cutter device for cutting a flat plate curved portion for carrying out the flat plate curved portion cutting method will be described. The basic concept is to cut a flat plate at a constant radius. When the cylinder 1 is rotated while keeping the inclination angle φ and the angle θ between the central axis C of the cylinder 1 and the flat plate 2 constant,
Since the radius of gyration (cutting radius) r of the flat plate 2 and the radius of the cylinder 1 are constant, the contact portion 3 between the cylinder 1 and the flat plate 2 is
It can be seen that the locus of is a circle. As shown in FIG. 2, if a cutter blade 4 is provided so as to be perpendicular to the flat plate 2 at a flat plate contact portion of the cylinder 1, and the disk cutter 5 is configured, the locus of the cutter blade 4 will be the same as in the case of the cylinder 1. It becomes a circle. In FIG. 1, the relationship between the inclination angle θ of the central axis C of the cylinder 1 from the horizontal plane and the inclination angle φ of the cylinder 1 from the vertical plane is θ + 90 ° = φ + 90 ° from the similarity of triangles, and thus θ = φ Becomes FIG. 3 shows the relationship between the cutter blade 4 and the curved line cutting line L when the disc cutter 5 is arranged on the cutting line having a constant radius. As can be seen from FIG. 3, the cutter blade 4 and the curved portion cutting line L coincide with each other, and the curved portion cutting line L and the cutter blade 4 are not in contact with each other. Therefore, it is understood that no lateral force is applied to the cutter blade 4 and the cutter blade 4 is prevented from being broken.

Referring to FIG. 4, an embodiment of a flat plate curved portion cutting disk cutter device to which the above basic concept is applied will be described. A drive mechanism 7 is erected on a fixed base 6, and a required height of the drive mechanism 7 is set. At the position, the base end of the arm 8 is fixed to the output rotary shaft (not shown), and the drive mechanism 7 drives the arm 8 to rotate. An inverted U-shaped cutter holder 9 is provided laterally below the tip of the arm 8, and a compressor 10 for pressing the cutter holder 9 downward is provided upright above the tip of the arm 8. A cylinder 1 is pivotally supported on the cutter holder 9 by inclining it at a certain angle with respect to a rotation center position of the arm 8 on the fixed base 6, and a disk cutter 5 is fixed to the outer periphery of the cylinder 1 concentrically. The cutter blade 4 of the disc cutter 5 is tilted with respect to the cylinder 1 so as to be perpendicular to the flat plate 2 on the extended horizontal plane of the fixed base 6. The reaction force against the pressing of the cutter blade 4 is transmitted from the arm 8 and is received at the fixed portion of the drive mechanism 7.

An embodiment of the flat plate curved portion cutting method according to the present invention by the flat plate curved portion cutting disk cutter device having the above-mentioned structure will be described. The cutter blade 4 of the disc cutter 5 inclined so as to be perpendicular to the flat plate 2 is described. , Compressor 10
Is pressed against the flat plate 2 via the cutter holder 9. At the same time, the arm 8 is rotated (revolved) by the drive mechanism 7, the disc cutter 5 pivotally supported by the cutter holder 9 below the tip of the arm 8 is revolved, and the cutter blade 4 is cut with the flat plate 2 to be cut. Rotate (rotate) by friction. At this time, the reaction force against the pressing of the cutter blade 4 is transmitted from the arm 8 and received at the fixed portion of the drive mechanism 7. By revolving the arm 8 by the drive mechanism 7 in this way, the disc cutter 5 pivotally supported by the cutter holder 9 at the tip of the arm 8
The cutter blade 4 is rotated, and at the same time, the compressor 10 gradually presses the cutter blade 4 against the flat plate 2 through the cutter holder 9, and the flat plate 2 is plastically deformed to cut the curved portion cutting line L, thereby cutting chips. There is no occurrence, and the cut surface has a smooth V shape.

Next, a description will be given of a disk cutter device for cutting a lip seal plate curved portion in an international thermonuclear fusion reactor (ITER) as an application example of the flat plate curved portion cutting disc cutter device. Before that, the lip seal in the thermonuclear fusion reactor will be described. The maintenance port 13 shown in Fig. 5b of the vacuum container 12 in the thermonuclear fusion reactor 11 shown in Fig. 5a.
The shielding plug 14 is operated by a plug handling device 15. In the fusion reactor 11, it is necessary to maintain a high vacuum inside the vacuum container 12 for confining the plasma. On the other hand, in order to maintain the equipment in the furnace, the vacuum container 12 has a device called a shield plug 14 that is removed at the time of maintenance in the furnace, and is installed in the maintenance port 13. The maintenance port 13 and the shield plug 14 are connected to each other. In order to maintain a high vacuum in the vacuum container 12 during furnace operation, a lip seal is provided at the plug mounting position. FIG. 6 shows the associated arrangement of the maintenance port 13, the shielding plug 14, the lip seal plate 16, the disk cutter device 17, the desk cutter device moving mechanism 18, and the handling device 19. The lip seal plate 16 is activated by the neutron rays generated during the operation of the furnace, and is cut and re-welded several times in the removal and attachment operations of the shield plug 14. As shown in FIGS. 7A and 7B, the lip seal plate 16 is a rectangular donut-shaped flat plate installed vertically, and includes a straight line portion 16a and a curved line portion 16b.

Straight portion 16a of the lip seal plate 16
Is cut using the conventional disc cutter device for straight line cutting, but the curved portion 16b is cut by the lip seal plate curved portion shown in FIG. 8 to which the flat plate curved portion cutting disc cutter device shown in FIG. 4 is applied. This is done using a disc cutter device for cutting. In this disk cutter device for cutting the curved portion of the lip seal plate, a motor 7a serving as a drive mechanism 7 is provided on the base surface of the arm 8.
And the speed reducer 7b are concentrically connected and fixed, and the arm 8
The L-shaped bent portion 8a fixed to the lower middle part of the compressor and the crank-shaped bent portion 8b at the tip of the arm 8 have compressors 10, 1 respectively.
0 is fixed. Reverse L-shaped cutter holders 9, 9 are attached to the tips of these compressors 10, 10.
A lip seal plate 16 is provided at the tip of the cutter holder 9, 9.
The cylinders 1 and 1 are pivotally supported by inclining them at required angles with respect to the arm rotation center position on the same plane. Disc cutters 5 and 5 are concentrically fixed to the cylinders 1 and 1, and the cutter blades 4 and 4 are inclined so as to be perpendicular to a lip seal plate 16 for cutting a curved portion. Reaction force rollers 20 and 20 are provided on the base end side and the tip end side of the arm 8 at the compressor position opposite to the disc cutters 5 and 5 so as to sandwich the lip seal plate 16.

A description will be given of an embodiment of a lip seal plate curved portion cutting method by the lip seal plate curved portion cutting disk cutter device having the above-described structure. Cutter blades 4 and 4 inclined so as to be perpendicular to the lip seal plate 16 will be described. The disc cutters 5 and 5 having the blades and the reaction force rollers 20 and 20 sandwich the lip seal plate 16 and the backing plate 21 to be cut, and the compressor 10 on the arm tip side bends through the cutter holder 9. At the same time as pulling the disc cutter 5 for parts and pushing the cutter blade 4 against the lip seal plate 16, the motor 7a is driven and the arm 8 is rotated (revolved) through the speed reducer 7b to revolve the disc cutter 5 on the arm tip side. Then, the cutter blade 4 is used to cut the lip seal plate 1 to be cut.
Rotate (rotate) by friction with 6. At this time, the reaction force against the pressing of the cutter blade 4 is received by the reaction force roller 20. In this way, by revolving the arm 8 by the motor 7a, the cutter blade 4 of the disc cutter 5 pivotally supported by the cutter holder 9 on the arm tip side is rotated, and at the same time, the compressor 10 causes the cutter blade 4 to move through the cutter holder 9.
Is gradually pressed against the lip seal plate 16, and the lip seal plate 16 is plastically deformed to cut the curved part cutting line L so that no chips are generated and the cut surface has a smooth V shape. become.

The cutter head portion held by the cutter holder 9 in the above-described flat plate curved portion cutting disc cutter device and lip seal plate curved portion cutting disc cutter device of the present invention has a fixed bending portion radius. Therefore, if it is changed, the cutter head unit itself is converted and used.

[0017]

As can be seen from the above description, according to the present invention, when a curved portion of a flat plate is cut at a constant radius, the disc is placed at a constant radius position where the angle formed by the flat plate with respect to the center point of the curved portion is kept constant. A cutter is provided and the cutter blade is tilted so as to be perpendicular to the flat plate, and the cutter blade is pressed against the flat plate while revolving around the center point of the curved portion to rotate on its own axis, and the flat plate is cut into a certain radius, and the plasticity is increased. Since the bent portion is cut by the deformation, no chips are generated, the cut surface has a smooth V shape, and groove processing is not required. Further, since a lateral load is not applied to the cutter blade, it is possible to accurately and stably cut the curved portion of the flat plate without damaging the cutter blade having a small thickness.

[Brief description of drawings]

FIG. 1 is a diagram for explaining the principle of a disc cutter in a disc cutter device for cutting a flat plate curved portion of the present invention.

FIG. 2 is a conceptual diagram of a disc cutter in a disc cutter device for cutting a flat plate curved portion of the present invention.

FIG. 3 is a diagram showing a relationship between a curved line cutting line and a cutter blade of a disc cutter.

FIG. 4 is a perspective view showing an embodiment of a disc cutter device for cutting a flat plate curved portion of the present invention.

5A is a vertical sectional view showing a thermonuclear fusion reactor, and FIG. 5B is an enlarged transverse sectional view showing a maintenance port portion of a vacuum container in the thermonuclear fusion reactor.

FIG. 6 is a perspective view showing the lip seal plate of the shield plug in the maintenance port portion, the disc cutter device for cutting the lip seal plate curved portion according to the present invention, the moving mechanism thereof, and the associated arrangement of the handling device.

7 is a partially enlarged front view of the lip seal plate, and b is a.
It is the XX sectional view taken on the line of FIG.

FIG. 8 is a front view showing another embodiment of the disk cutter device for cutting a flat plate (lip seal plate) curved portion of the present invention.

9A and 9B show the principle of the disc cutter, where a is a front view and b is a side view.

FIG. 10 is a diagram showing a relationship between a curved line cutting line and a cutter blade of a conventional disc cutter.

[Explanation of symbols]

1 cylinder 2 flat plates 4 cutter blade 5 disc cutter 6 fixed base 7 Drive mechanism 8 arms 9 cutter holder 10 compressor 16 lip seal plate 20 Reaction roller

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kiyoshi Shibanuma, Kiyoshi Shimonuma 4 Shirane, Tokai-mura, Naka-gun, Ibaraki 4 4 of Shirane, Japan Atomic Energy Research Institute, Tokai Research Institute No. 6-5 Kawasaki Heavy Industries, Ltd. Tokyo Design Office (56) Reference JP-A-7-279118 (JP, A) JP-A-10-277834 (JP, A) Actual Kaihei 5-29625 (JP, U) 55-179722 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B23D 19/08 B28D 1/04 E01C 23/09 G21C 19/02

Claims (3)

(57) [Claims] 1. When a flat plate is cut into a curved portion having a constant radius, the lower end of the arm is located at a constant radius position with respect to the center point of the curved portion.
A cylinder is installed in the cutter holder provided so as to be inclined at a certain angle with respect to the flat plate , and the tilt angle and the angle formed by the cylinder center axis and the flat plate are held at the same angle, and the cutter holder is attached to the arm tip.
So that it can be pressed by the compressor installed on the upper side of the part
And, fixedly concentrically the cutter blade is inclined so as to be flat and vertical and the flat plate contact point of the cylinder, the arm the cutter blade
Through the cutter holder at the revolution of <br/> allowed Rutotomoni the compressor by a drive mechanism around the curved portion center point through the
A method for cutting a curved portion of a flat plate, which comprises pressing a cutter blade vertically against a flat plate to rotate the flat plate, cutting the flat plate to a constant radius by plastic deformation, and cutting the curved part. 2. An arm that is rotated by a drive mechanism that is erected on a fixed base, a cutter holder that is provided on the lower side of the arm tip end and is pressed downward by a compressor on the upper end of the arm tip, and a cutter holder on the fixed base. A cylinder that is tilted at a constant angle with respect to the rotation center position of the arm, and the tilt angle and the angle between the center axis of the cylinder and the flat plate on the extended horizontal plane of the fixed base are held at the same angle, A disc cutter for cutting a curved portion of a flat plate, which comprises a disc cutter fixed concentrically, and a cutter blade which is concentrically provided integrally with the disc cutter and is inclined so as to be perpendicular to a flat plate on an extension horizontal plane of the fixed base. apparatus. 3. A drive mechanism fixed to the base surface of the arm, a compressor provided in the middle of the arm and at the tip of the arm, cutter holders on the arm base end side and the arm tip side attracted by these compressors, and both cutter holders. A cylinder which is tilted at the required angle with respect to the arm rotation center position on the same plane as the flat plate to be bent at the tip of the cylinder, and the tilt angle and the angle between the cylinder center axis and the flat plate are held at the same angle. A disk cutter fixed concentrically to both cylinders, a cutter blade concentrically provided with both disk cutters and tilted so as to be perpendicular to a flat plate for cutting a curved portion, and so as to sandwich the flat plate. A disc cutter for cutting a flat plate curved portion including a reaction force roller provided on the arm base end side and the arm tip end side at the compressor position opposite to both disc cutters. Device.