JPH10180536A - Cutting method of tubing and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use even a circular saw blade of which the diameter is equal to the diameter of tubing or smaller than it by cutting the tubing through longitudinally reciprocating by a fixed stroke a circular saw blade with square shaped cutting blade while rotating at higher peripheral speed than the tubing, while the tubing is rotated around the axis. SOLUTION: While rotating tubing W around the axis by a rotational driving means, a circular saw blade 5 with square shaped cutting blade is longitudinally reciprocated by means of a hydraulic cylinder 10 by a fixed stroke while rotating at higher peripheral speed than the tubing W and cuts off the tubing. Hereby, even the circular saw blade 5 of which the diameter is equal to the diameter of the tubing W or smaller than it can be used, the cost of the circular saw blade 5 can be lowered, the moving stroke of the circular saw blade 5 can be shortened, and hence the cutting time can be shortened. In addition, the tubing W is not deformed even in the case of tubing W of thin wall or soft material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for cutting a pipe such as a steel pipe.

[0002]

2. Description of the Related Art Conventionally, when cutting a pipe such as a steel pipe, if the pipe is relatively thick, the pipe is fixed by a vise and cut by a rotating circular saw blade. However, in this case, the saw blade cuts the swarf accumulated in the pipe twice during cutting, which has an adverse effect on the life of the saw blade, and also moves the circular saw blade across the pipe to cut. Therefore, a circular saw blade with a considerably larger diameter than the pipe material is required, and the moving stroke of the circular saw blade becomes longer.
For this reason, there is a problem that the cost of the circular saw blade is very high, and a considerably long time is required for cutting.

In the case of a thin tube, a disk-shaped cutter is used, and the tube is rotated around its axis.
Cutting is performed by advancing the disk cutter in the direction perpendicular to the tube material and pushing it off. However, according to this disk cutter, the blade portion of the cutter has a tapered shape. A considerably large bulge is formed on the outer periphery of the cut end, and it takes a lot of time to remove the bulge after cutting. In addition, in the case of a thin tube or a tube made of a soft material, the squeeze of a disk cutter is used. There was a problem that the tube material was deformed by the action.

In view of the above-mentioned problems, the present invention can use a circular saw blade having a diameter equal to or smaller than the diameter of a tube material, can shorten the moving stroke of the circular saw blade, and can use a circular cutter. It is an object of the present invention to provide a cutting method and a cutting device that eliminate bulging of the outer periphery of a cut end of a pipe material and that do not deform a thin or soft pipe material.

[0005]

According to a first aspect of the present invention, there is provided a method for cutting a tubular material, comprising a square cutting blade which advances and retreats in a direction perpendicular to the tubular material W while rotating the tubular material W to be cut around its axis. It is characterized in that the circular saw blade 5 is rotated at a peripheral speed higher than that of the tube W to cut the tube W.

According to a second aspect of the present invention, in the method for cutting a tubular material according to the first aspect, the rotating direction of the tubular material W and the rotating direction of the circular saw blade 5 are opposite to each other.

[0007] According to a third aspect of the present invention, there is provided a pipe cutting apparatus.
It has a rotation driving means 4 for fixing the pipe W to be cut by the chuck 3 and rotating it around the axis, and a circular saw blade 5 for forming a V groove which is driven to rotate. A circular saw unit 6 configured to advance and retreat in the direction by a predetermined stroke S1.

According to a fourth aspect of the present invention, in the tube cutting apparatus according to the third aspect, the chuck 3 is a tapered split-type chuck collet for gripping and fixing a required portion of a pipe W passing through the fixed casing 1. 18 and collet 18 at the front end
A collet opening / closing operation sleeve 19 which has a taper fitting portion 19a which can be fitted to the taper portion 18a, and which is rotatable and movable in the axial direction, and a sleeve 19 at the rear end of the sleeve 19 Sleeve push / pull member 2 integrally movable axially and rotatably connected thereto
1 and a fluid pressure cylinder 2 for moving the sleeve push-pull member 21 back and forth in the axial direction via a swing link mechanism 22
3 by pushing and pulling the sleeve push / pull member 21 back and forth by the expansion and contraction operation of the cylinder 23 to fit and remove the taper fitting portion 19a of the sleeve 19 with the taper portion 18a of the collet 18. The rotation driving means 4 is rotatably supported in the fixed casing 1 and is connected to the collet 18 so as to be integrally rotatable by opening and closing operation and gripping the tube material W by the closing movement. It is characterized by comprising a transmission shaft 26 and a gear mechanism 28 driven by a motor 27 to rotate the transmission shaft 26.

[0009]

FIG. 1 is a front view of a cutting apparatus according to the present invention, and FIG. 2 is a vertical sectional side view thereof. In these figures, reference numeral 1 denotes a fixed casing, which penetrates a central portion inside the casing 1 through which a pipe material W such as a steel pipe fed by a pusher (not shown) of a pipe material feeding apparatus penetrates from the rear of the cutting device. A path 2 is formed. Around the through path 2, there is provided a rotation drive means 4 for rotating the pipe W about the pipe core while fixing the pipe W in the vicinity of the cutting position P by the chuck 3. The chuck 3 and the rotation driving means 4 will be described later in detail. As shown in FIG. 1, a circular saw blade 5 that is driven to rotate is provided on the front side of the fixed casing 1, and one side (left side in the figure) of a pipe W to cut the circular saw blade 5. A circular saw unit 6 is provided which is configured to advance and retreat a predetermined stroke S1 in the direction perpendicular to the tube material W.

As shown in FIGS. 1, 3 and 4, the circular saw unit 6 supports the circular saw blade 5 on the free end side of a saw blade frame b that swings about a pivot a. The rotary shaft c of the saw blade 5 is driven to rotate by a motor d. The output shaft e of the motor d and the first transmission shaft f are connected to timing pulleys g and h.
And the first transmission shaft f and the second transmission shaft j are connected by the gears k and l, and the rotation of the second transmission shaft j is rotated by the rotation shaft c through the gears m and n.
I'm trying to tell. In FIG. 3, q represents a circular saw blade 5.
This gear is provided so as to mesh with the final stage gear n close to the gear n and to remove backlash of the gear n. A fluid pressure cylinder 10 is provided between the free end of the saw blade frame b and the fixed frame 7 to move the circular saw blade 5 forward and backward by a predetermined stroke S1 with respect to the tube material W via the saw blade frame b. And the reciprocating stroke S1 of the circular saw blade 5
Can be arbitrarily set by adjusting the stroke of the fluid pressure cylinder 10. As shown in FIGS. 9A and 9B, the circular saw blade 5 of the circular saw unit 6 is formed by forming a cutting blade 5c with a square tip 5b on the periphery of a saw blade main body 5a.

As shown in FIG. 2, the chuck 3 has a tapered split-type chuck collet 18 for gripping and fixing a pipe material W penetrating through the inside of the fixed casing 1 in the vicinity of a cutting position P on the near side. A collet opening / closing operation sleeve 19 having a taper fitting portion 19a capable of fitting to the taper portion 18a of the collet 18 and being rotatable and movable in the axial direction itself, and a bearing at a rear end portion 19b of the sleeve 19. A short tubular sleeve pushing / pulling member 21 that is axially movable integrally with the sleeve 19 and relatively rotatably connected to the sleeve 19 via the link 20, and the sleeve pushing / pulling member 21 is connected to the sleeve 19 via a swing link mechanism 22. And a fluid pressure cylinder 23 that moves back and forth in the axial direction. Therefore, by swinging the swing link mechanism 22 back and forth by the expansion and contraction operation of the cylinder 23 to push and pull the sleeve push / pull member 21 back and forth in the axial direction, the taper fitting portion 19a of the sleeve 19 The collet 18 is closed (reduced in diameter) or opened (expanded in diameter) by the tapered portion 18a, and the tube W is gripped and fixed by the closing movement. The rotary drive means 4 is rotatably supported in the fixed casing 1 via bearings 24 and 25 and is rotatably connected to the collet 18 so as to be integrally rotatable. And a gear mechanism 28 that rotates the cylindrical transmission shaft 26 by being driven by the motor.

FIGS. 5 and 6 show the structure of the chuck 3.
More specifically, referring to FIG.
Consists of a pair of swing levers 29, 29 arranged on both sides of the sleeve pushing / pulling member 21.
The lower end of 29 is pivotally attached to a bracket 37 attached to the base 1a of the fixed casing 1 by a rotation support shaft 30, and the middle portion is a sleeve pushing / pulling member 21 via slide engagement portions 31,31. The upper end is pivotally connected to the piston rod 23a of the fluid pressure cylinder 23 via the rotary support shaft 32.

FIGS. 2 and 5 show a chuck collet 18.
Swing lever 29 when is closed and grips and fixes tube W
In this case, the fluid pressure cylinder 23 is in the contracted position. When the fluid pressure cylinder 23 is extended from this state, the swing lever 29 swings clockwise in the figure around the rotation support shaft 30 at the lower end thereof, whereby the sleeve pushing / pulling member 21 is moved rearward in the axial direction. , The collet opening / closing operation sleeve 19 is pulled backward, whereby the chuck collet 18 is expanded (opened), and the gripping and fixing of the tube W by the collet 18 is released. When the fluid pressure cylinder 23 contracts from this chuck release state, the swing lever 29 swings counterclockwise, and pushes the collet opening / closing operation sleeve 19 forward. The joint portion 19a is pressed and fitted to the tapered portion 18 of the collet 18, whereby the diameter of the collet 18 is reduced (closed) so that the tube W is gripped and fixed. In addition, as shown in FIG.
Caps 33, 34 having inner diameters corresponding to the outer diameters of the pipes are detachably mounted. The upper half of the figure shows a cap 33 for a small-diameter pipe W, and the lower half thereof is a cap for a large-diameter pipe W. 3
4 is shown.

In the rotation driving means 4, the motor 2
As shown in FIG. 2, a gear mechanism 28 driven by the motor 7 to rotate the cylindrical transmission shaft 26 is provided on the worm wheel 35 provided on the outer periphery of the cylindrical transmission shaft 26 and on the output shaft 27a side of the motor 27. And a worm 36 meshed with the worm wheel 35. Also, the cylindrical transmission shaft 2
6 is connected to the collet 18 by a short cylindrical member 38 and an end plate 39 connected to the front end thereof so as to be able to rotate integrally with the collet 18 and to allow the collet 18 to expand and contract. Therefore, when the cylindrical transmission shaft 26 is rotated via the gear mechanism 28 by the drive of the motor 27, the collet 18 is rotated via the short cylindrical member 38 and the end plate 39, and at this time, the collet 18 is reduced in diameter (closed). ) If in the state, collet 18
The tube material W gripped and fixed by the rotation is rotated, and the collet 1
If the tube 8 is in the expanded (open) state, the tube material W
Will be free from rotation.

FIG. 7 shows a sizing stopper 40 for cutting the tube material W into a fixed length, and FIG. 8 shows a pusher push rod 41 for advancing the tube material W to the position of the sizing stopper 40. I have. The fixed size stopper 40 is attached to the machine frame 4
2 and the stopper body 44, and the stopper body 4
4 is provided with a support rod 46 that can be adjusted to expand and contract in the tube material feeding direction by a handle 45, and a backing plate 48 that is rotatably attached to the distal end of the rod 46 via a bearing 47. Further, the machine frame 42 is slidably supported by an inclined guide rail 51 provided on the mounting table 50, and advances and contracts with the distal end of the pipe W as shown by a solid line by the expansion and contraction operation of the fluid pressure cylinder 52. A predetermined stroke S2 between the position and a retreat position for retreating from the supply path of the pipe material W as shown by a virtual line can be advanced and retracted. Further, the push rod 41 of the pusher is rotatably attached to the distal end of the push rod 41 through a bearing 53 so that the push rod 41 is engaged with the rear end of the tubular material W. It has become.

A method of cutting the tube W by using the cutting device having the above-described configuration will be described. First, at the time of cutting, the forward / backward stroke S1 of the circular saw blade 5 is set by the hydraulic cylinder 10. In addition, fixed size stopper 4
7 is advanced to a position where the backing plate 48 faces the front end of the tube W passing through the inside of the fixed casing 1 of the cutting device as shown by the solid line in FIG. Set the cutting length of

After the tube W is pushed from behind the cutting device by the push rod 41 of the pusher to bring the tip of the tube W into contact with the backing plate 48, the tube W is gripped and fixed by the chuck 3. , The tube material W by the rotation driving means 4
Is rotated around its axis at a predetermined peripheral speed in a direction opposite to the circular saw blade 5 (see FIG. 1). In this case, the peripheral speed of the pipe W is, for example, about 10 m / min, and the peripheral speed of the circular saw blade 5 is, for example, about 250 m.
/ Min.

By rotating the circular saw blade 5 back and forth between the stroke S1 from the retreat position shown by the solid line in FIG. 4 to the advance position shown by the phantom line while rotating the pipe W around the axis as described above, Then, the tube material W is cut. Thereafter, by repeatedly performing the above-described series of operations, the fixed-size cutting of the tube material W can be continuously performed. In this case, the drive motor 27 of the rotary drive unit 4 does not need to be stopped for each cut, but can be constantly rotated.

According to this cutting method, the circular saw blade 5c with the square cutting blade 5c is rotated while rotating the pipe material W around its axis.
Is cut back and forth by reciprocating a predetermined stroke S1 while rotating at a peripheral speed faster than the pipe material W, so that there is no risk that the saw blade cuts the swarf accumulated in the pipe twice during cutting as in the conventional method. , Can extend the life of the saw blade. In addition, the swelling of the outer periphery of the cut end that occurs at the time of pushing and cutting the pipe material as with the disk cutter is eliminated, and a good cut can be performed. In particular, to rotate the tube material W around its axis,
The circular saw blade 5 having a diameter equal to or smaller than the diameter of the tube material W can be used, so that the cost of the circular saw blade 5 can be reduced, and the moving stroke of the circular saw blade 5 can be shortened, thereby shortening the cutting time. Can be. Further, according to this cutting method, even in the case of a thin or soft tube, the tube is not deformed. Further, since the cutting is performed by the circular saw blade with the square cutting blade, the phenomenon that the cutting chips become long and sticks to the work as in the case of cutting with a cutting tool does not occur, and the cutting chips can be subdivided. Furthermore, the rotation direction of the pipe W and the circular saw blade 5
By reversing the rotation directions of the circular saw blades, the initial biting of the circular saw blade 5 with respect to the tube material W is good, no chattering or rattling occurs, and the cutting accuracy can be improved.

When the tube W is cut with a relatively short cutting length as in the above-described embodiment, it is not necessary to hold the tube portion cut off by cutting. It is preferable to provide a vice for gripping the pipe material to be cut off.

[0021]

According to the cutting method of the first aspect of the present invention, the circular saw blade with the square cutting blade is rotated at a higher peripheral speed than the tubular material while rotating the tubular material around the axis thereof at a predetermined stroke. Since the cutting is performed by reciprocating forward and backward, there is no possibility that the saw blade cuts the chips accumulated in the pipe twice during the cutting as in the conventional method, and the life of the saw blade can be extended. In addition, there is no swelling of the outer periphery of the cutting end that occurs at the time of pushing and cutting the pipe material as with a disk cutter, and a good cutting can be performed. In particular, in this cutting method, since the circular saw blade advances and retreats with respect to the tube material while rotating the tube material, it is possible to use a circular saw blade having a diameter equal to or smaller than the diameter of the tube material. Since the cost can be reduced and the moving stroke of the circular saw blade can be shortened, the cutting time can be shortened. Further, even in the case of a thin or soft tube, the tube is not deformed. Furthermore,
Since the cutting is performed by the circular saw blade with the square cutting blade, the chip becomes long and does not stick to the work as in the case of cutting with a cutting tool, and the chip can be subdivided.

According to the second aspect, the rotation direction of the tube material and the rotation direction of the circular saw blade are made opposite to each other, whereby the first biting of the circular saw blade with respect to the tube material is good, and chatter and rattling are prevented. Cutting accuracy can be improved.

According to a third aspect of the present invention, there is provided a cutting device comprising: a rotary driving means for fixing a pipe material by a chuck and rotating the pipe material around an axis; and a circular saw blade for forming a V groove which is driven to rotate. And a circular saw unit configured to advance and retreat a predetermined stroke in the direction perpendicular to the pipe material, so that the cutting method according to claims 1 and 2 can be effectively implemented, and the structure is simple and inexpensive. Can be.

According to the fourth aspect, the sleeve pushing / pulling member is moved rearward in the axial direction via the swing link mechanism by, for example, the extension operation of the fluid pressure cylinder, and the collet opening / closing operation sleeve is pulled rearward. By releasing the chuck collet, the gripping and fixing of the tube material is released, and the fluid pressure cylinder is contracted from this state to move the sleeve pushing / pulling member forward in the axial direction via the swing link mechanism. By pressing the collet opening / closing operation sleeve forward, the tapered fitting portion of the sleeve is pressed and fitted to the tapered portion of the collet, whereby the collet is closed and the tube can be gripped and fixed. In addition, by rotating the cylindrical transmission shaft via the gear mechanism by the driving motor, the collet rotates, and at this time, if the collet is in the closed state, the tube material gripped and fixed by the collet rotates. When the collet is in the open state, the tube material is released from the collet and becomes movable in the axial direction. Therefore, the chuck can be opened and closed at any time by the expansion and contraction operation of the fluid pressure cylinder while the drive motor is being activated, and the tube can be cut continuously.

[Brief description of the drawings]

FIG. 1 is a front view of a cutting device according to the present invention.

FIG. 2 is a vertical sectional side view of the cutting device.

FIG. 3 is a vertical sectional front view of a circular saw unit in the cutting apparatus.

FIG. 4 is an enlarged vertical sectional side view of a main part of the circular saw unit.

FIG. 5 is an enlarged partial cross-sectional side view showing a rear end portion of the cutting device.

FIG. 6 is an enlarged partial cross-sectional rear view showing a rear end of the cutting device.

FIG. 7 is a side view showing a sizing stopper in the cutting device.

FIG. 8 is a side view showing a push rod of a pusher in the cutting device.

9A is a partially enlarged front view of a circular saw blade, and FIG. 9B is a cross-sectional view taken along line XX of FIG. 9A.

[Explanation of symbols]

 W Tube material 1 Fixed casing 2 Penetration path 3 Chuck 4 Rotation driving means 5 Circular saw blade 6 Circular saw unit 18 Collet 19 Collet opening / closing operation sleeve 21 Sleeve pushing / pulling member 22 Swing link mechanism 26 Cylindrical transmission shaft 27 Driving motor 28 Gear mechanism

Claims (4)

[Claims] 1. While rotating a pipe to be cut around its axis, a circular saw blade with a square cutting blade which advances and retreats in a direction perpendicular to the pipe is rotated at a higher peripheral speed than the pipe to cut the pipe. A method for cutting a pipe material, characterized in that: 2. The method of cutting a pipe material according to claim 1, wherein the rotation direction of the pipe material and the rotation direction of the circular saw blade are reversed. 3. A rotary driving means for fixing a pipe to be cut by a chuck and rotating it around an axis, and a circular saw blade with a square cutting blade driven to rotate, wherein the circular saw blade is perpendicular to the pipe material. And a circular saw unit adapted to advance and retreat a predetermined stroke in a direction. 4. The chuck according to claim 1, wherein the chuck has a tapered split-shaped chuck collet for gripping and fixing a required portion of a pipe material passing through a fixed casing, and a tapered fitting portion which can be fitted to a tapered portion of the collet at a front end portion. A collet opening / closing sleeve that is rotatable and movable in the axial direction, and a sleeve that is connected to the rear end of the sleeve integrally with the sleeve so as to be axially movable and relatively rotatable therewith. A push / pull member, and a fluid pressure cylinder that moves the sleeve push / pull member back and forth in the axial direction via a swing link mechanism. The collet is opened and closed by engaging and disengaging the tapered fitting part of the collet with the tapered part of the collet, and the closing movement of the collet grips the tube. The rotation drive means includes a cylindrical transmission shaft rotatably supported in a fixed casing and integrally rotatably connected to the collet; and a gear mechanism driven by a motor to rotate the transmission shaft. The tube cutting device according to claim 3, characterized in that: