JP2003094235A - Method and apparatus for cutting-off pipe during traveling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and apparatus for cutting-off a pipe during traveling, which can cut-off continuously supplied pipes at a high speed and with high quality. SOLUTION: The pipe P is supplied so that a tip end of the pipe P passes over the outside of an inner blade 32a attached to an end of a core rod arranged at a cutting-off position of a cutting-off machine 20. When the tip end of the pipe has passed the cutting-off position and the projecting length of the pipe from the cutting-off position has become a required length, the cutting-off machine 20 begins to travel in the direction for supplying the pipe and is accelerated up to the same speed as the supply speed of the pipe by means of a travel drive mechanism. When the projecting length of the pipe has become a required length and the traveling speed of the cutting-off machine has coincided with the supply speed of the pipe, a pipe clamp 14 grips a tip end side of the pipe to be cut-off, and cutting-off blades 21 of the cutting- off machine 20, which are driven so as to rotate and whirl, are pressed against the outside periphery of the pipe at the position of cutting-off while rotating and whirling in such a state that the inner blade 32a attached to the end of the core rod is positioned in the pipe. As a result, the pipe is cut-off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe running and cutting method and apparatus for cutting a pipe continuously fed in a metal pipe manufacturing line or the like to a predetermined size while running.

[0002]

2. Description of the Related Art Conventionally, in a production line for producing metal pipes, when a pipe to be continuously delivered is cut into a predetermined length, a pipe clamp and a disc are mounted on a truck that travels at the same speed as the pipe to be delivered. It is known that a traveling cutting device equipped with a blade-shaped cutter is used, and while the truck is traveling at the same speed as the pipe sent from the manufacturing line, the cutter is rotationally driven to cut the pipe into a predetermined length. (See, for example, Japanese Patent Laid-Open No. 7-80797).

[0003]

In this type of pipe traveling cutting device, since a disc-shaped cutter is rotationally driven to cut the pipe, the pipe is cut by a distance corresponding to at least the diameter of the cutter in the radial direction of the pipe. Since the rotary blade is moved and cut, there is a problem that it takes time to cut and the pipe cannot be cut efficiently. In addition, a disc-shaped rotary drive type cutter tends to cause burrs on the cut surface of the pipe, and in a cutting machine that presses a free rotary blade to cut, the cut end of the pipe is crushed inward. There is a problem that it is easily deformed.

The present invention has been made to solve the above-mentioned problems, and provides a pipe running and cutting method and device for cutting continuously fed pipes at high speed and with high quality. The purpose is to

[0005]

In order to achieve the above-mentioned object, a method for cutting and running a pipe according to the present invention is designed such that a pipe fed continuously is cut by a cutting machine running at the same speed as the pipe. In the traveling cutting method of the pipe to be cut into the dimension of, the step of feeding the pipe so as to pass the tip of the pipe to the outside of the inner blade of the core bar end portion arranged at the cutting position of the cutting machine, When the tip passes the cutting position and the protruding length of the pipe from the cutting position reaches a predetermined length, the cutting machine starts to move in the pipe feeding direction and the cutting machine is moved at the same feeding speed as the pipe. By the process of accelerating to the speed and the acceleration operation of the cutting machine, when the protruding length of the pipe becomes the predetermined cutting length and the moving speed of the cutting machine matches the feeding speed of the pipe, the pipe clamp grips the cutting tip side of the pipe. However, the inner blade of the end of the core bar is a pipe In the state where the cutting machine is driven, the driven rotary swivel disk-shaped cutting blade of the cutting machine is pressed against the outer circumference of the pipe at the cutting position to swivel and cut the pipe, and the pipe clamp is used to cut the cut pipe. A step of advancing the pipe clamp to carry out the cutting pipe in the grasped state.

Further, the pipe traveling / cutting device of the present invention is
A pipe traveling / cutting device that cuts a continuously fed pipe at a same speed as the pipe to a predetermined size by a traveling unit that travels in the pipe feeding direction. It is movable with the unit and has a plurality of driven rotary swivel disc-shaped cutting blades.The cutting blades are pressed against the outer peripheral surface of the pipe while being swiveled at the outer peripheral portion of the cutting location of the pipe to cut the pipe. Machine, a core bar provided at the end with an inner blade inserted into the pipe at the cutting position, and a core bar disposed at the same axial center position as the pipe to be fed, and a core bar provided in the traveling unit. A cored bar clamp that is supported coaxially with the axis of the pipe, a pipe clamp that is provided in the traveling unit, that grips the cut portion of the pipe, grips the cut pipe and moves in the carry-out direction, and the tip of the pipe. Cutting position When the length of protrusion from the cutting position of the pipe reaches a predetermined length, the cutting machine and the traveling unit start moving in the pipe feeding direction, and the cutting machine and the traveling unit are fed at the pipe feeding speed. And a traveling drive mechanism for accelerating to the same speed as.

[0007]

In such a pipe traveling / cutting device, a pipe continuously fed from a manufacturing line or the like has a tip of the pipe placed outside the inner blade of the core bar end portion arranged at the cutting position of the cutting machine. It is sent to pass. When the tip of the pipe passes the cutting position and the protruding length of the pipe from the cutting position reaches a predetermined length, the cutting machine starts moving in the pipe feeding direction, and the traveling drive mechanism feeds the pipe. It is accelerated to the same speed as the feed rate.

Due to the acceleration operation of the cutting machine, when the protruding length of the pipe becomes a predetermined cutting length and the moving speed of the cutting machine matches the feeding speed of the pipe, the cutting tip side of the pipe is gripped by the pipe clamp and the core is cut. With the inner edge of the gold end positioned inside the pipe, the driven rotary swivel disc-shaped cutting blade of the cutting machine swivels to press against the outer circumference of the pipe at the cutting position, and the pipe cuts to the specified cutting length. Is cut by.

The cutting pipe which has been cut is advanced in the carry-out direction while being held by the pipe clamp, and the cutting pipe is carried out. In this way, the pipe is cut while being swung while pressing the outer circumference of the pipe with the disc-shaped cutting blade of the driven rotary type and the swivel type in the state where the inner blade is put inside. It can be cut at high speed without being crushed inside, and burrs do not occur on the cut surface,
It can be cut well.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a front view of the traveling cutting device. Reference numeral 1 is a pedestal of the cutting device, rails 2 are laid on both sides of the pedestal 1, and the traveling unit 1 is mounted on the rail 2.
0 is arranged so that it can run. A screw shaft 4 for driving the traveling unit 10 along the rail 2 is rotatably supported on the frame 1 via bearings 5 and 5.

A pulley 6 is fixed to the tip of the screw shaft 4, the pulley 6 is linked to the rotary shaft of the traveling motor 3 via a belt 7, and the screw shaft 4 is rotationally driven by the traveling motor 3. The traveling unit 10 is configured by horizontally fixing the beam 11 on two rectangular frame-shaped vertical frames 12 and 12, and engaging portions 12a and 12a are attached to lower ends of both sides of the vertical frames 12 and 12, respectively. , The engaging portions 12a, 12a are engaged with the rail 2 to travel. Although not shown, the engaging portion 12
A large number of steel balls or rolls are arranged on the engagement surfaces of a and 12a so that the rails can travel with very low frictional resistance.

A cutting machine 2 for cutting a pipe P by swiveling a driven rotary disk type cutting blade at the end of the traveling unit 10.
0 is provided, and the base 24 of the cutting machine 20 is provided with engaging portions 24a, 24a similar to the engaging portions 12a, 12a on both sides, and can travel on the rail 2 with a small friction resistance.
Further, the traveling unit 10 and the base 24 of the cutting machine 20 are connected by the connecting rod 9 and travel integrally. The female screw portion 8 is attached to the bottom of the base 24 of the cutting machine 20,
The screw shaft 4 is screwed into the screw hole of the female screw portion 8. As a result, when the screw shaft 4 is rotationally driven by the traveling motor 3, the cutting machine 20 and the traveling unit 10 receive a driving force in the axial direction via the female screw portion 8 and integrally travel along the rail 2. Is.

The cutting machine 20 horizontally mounts a cylindrical portion 25 on the base 24 for introducing the pipe P of the object to be cut,
The rotating body 23 is rotatably arranged outside the cylindrical portion 25. A pair of disc-shaped cutting blades 2 is provided at the front of the rotating body 23.
1, 21 are rotatably supported by a pair of cutting blades 21, 2.
1 is freely rotatable and is supported so as to be movable in the radial direction, that is, in the radial direction with respect to the pipe P passing through the cylindrical portion 25. Therefore, the pair of cutting blades 21 and 21 swivel around the pipe P of the object to be cut by the rotation of the rotating body 23.

Further, on the base 24 of the cutting machine 20, 2
Fluid pressure cylinders 28, 28 are mounted horizontally,
The tip of the piston rod is connected to a cam member on the rotating body 23 via a ball bearing. The cam member engages with the cam followers attached to the moving plates of the pair of cutting blades 21 and 21, and when the piston rods of the fluid pressure cylinders 28 and 28 are pushed out and actuated, the cam members 29 move in the same direction to form one pair. The cutting blades 21 and 21 are moved toward the central cylindrical portion, that is, the pipe P. Like this one
The pair of cutting blades 21 and 21 are rotatably supported in a free state, rotate with the rotation of the rotating body 23, rotate in contact with the central pipe P, and are pressed in this state, so that the pipe P is rotated around the circumference. It is a structure that is cut from the side like a push-cut.

Reference numeral 32 is a cored bar formed in a rod shape, and is arranged so as to be inserted into the pipe P when the pipe P is cut. The cored bar 32 is disposed horizontally and coaxially with the pipe P to be fed so that the inner blade 32a provided at the tip thereof is inserted into the cylindrical portion 25 at the center of the cutting machine 20. The cored bar 32 is formed into a rod shape that can be inserted inside the pipe P, and a cylindrical inner blade 32a having a slightly larger diameter is fixed to the tip end thereof, and the stepped portion of the inner blade 32a is formed as a blade. It The blade of the inner blade 32a is always the cutting blades 21 and 21.
It is located at a position facing.

Therefore, the cored bar 32 is supported by a pair of the first cored bar clamp 16 and the second cored bar clamp 17 concentrically with the axis of the pipe P to be fed. The first core metal clamp 16 and the second core metal clamp 17 have the same structure, and as shown in FIG. 3, a pair of clamp arms 16f and 17f.
Is pivotally supported so that the lower part thereof can be opened and closed upward, and by a pair of fluid pressure cylinders 16c, 16d, 17c, 17d,
This is a structure for opening and closing the pair of clamp arms 16f and 17f.

The first cored bar clamp 16 and the second cored bar clamp 17 have bases 16a and 17a at the bottoms thereof, and engaging portions 16b and 17b are provided under the bases 16a and 17a. 17b engages on the rail 2 so that it can travel. In addition, the bases 16a and 17a are the vertical frame 12
And the vertical frame 12 or the traveling unit 10 and can be moved on the rail 2. During operation, the first core bar clamp 16 and the second core bar clamp 17 alternately repeat clamping and unclamping to hold the core bar 32 at a predetermined axial center position while passing the pipe P around the outer periphery of the core bar 32. To do.

A lower rail 13 is horizontally attached to the lower side of the beam 11 along the longitudinal direction, and a first pipe clamp 14 and a second pipe clamp 15 are engaged with the lower rail 13 in a suspended state so as to be movable. To do. The first pipe clamp 14 and the second pipe clamp 15 have bases 14a, 15a.
And engaging portions 14b and 15b on the
b and 15b are engaged with the lower rail 13, and the long cylinder 3
It can be moved by the operations of 3, 34. Long cylinder 3
3, 34 are arranged on both sides of the beam 11, and the tips of their piston rods are connected to the bases 14a, 15a of the respective clamps.

As shown in FIG. 3, the base 1 of each clamp
Fluid pressure cylinders 14c and 15c are fixed downward under 4a and 15a, and the tips of their piston rods are attached to the rack 15.
connected to d. The rack 15d is arranged so as to be slidable up and down, and a pair of pinions 15f are engaged with and axially supported on both sides of the rack 15d, and a clamp arm 15e is supported on the shaft so as to be opened and closed downward.

With this structure, the first pipe clamp 14 and the second pipe clamp 15 are connected to the fluid pressure cylinder 1.
4c, 15c actuates the downward clamp arm 1
5e and 15e are opened and closed to clamp the pipe P inserted outside the cored bar 32, and the pipes P are sent to the discharge side by the pullback operation of the long cylinders 33 and 34. At this time,
The first pipe clamp 14 performs a clamp and unclamp operation so as to deliver the pipe P to the second pipe clamp 15, and conveys / moves along the rail.

The traveling motor 3 is provided with a rotary encoder, and the encoder outputs a signal accurately indicating the traveling distance from the origin position of the traveling unit 10. Although not shown, the traveling unit 10
A sensor for detecting the origin position of the first pipe clamp 14 and the second pipe clamp 15 and a sensor for detecting the transport end position are provided. Furthermore, an encoder that outputs a signal that accurately indicates the moving distance of the pipe P is provided in the conveying device in the production line of the pipe P (not shown). It is input to the control device for controlling the drive unit and used to control each drive unit.

Next, the operation of the traveling cutting device having the above construction will be described with reference to FIGS. FIG. 7 shows a state in which the traveling unit 10 is located at the origin position. A pipe P (for example, a stainless pipe having a diameter of about 30 m) manufactured from the manufacturing line on the left side is continuously cut at a constant speed by the cutting machine 20.
Is fed into the central cylindrical portion 25 of the.

When the protruding length of the tip of the pipe P from the cutting position of the cutting machine 20 reaches a predetermined length C, the traveling unit 10 starts to move forward together with the cutting machine 20. The predetermined length C at this time is calculated from C = (cutting length A of the pipe P) − (distance B that the traveling unit 10 moves to catch up with the pipe P, that is, to reach the same speed as the pipe P). . When the tip of the pipe P is projected from the cutting position by a predetermined length C, the traveling motor 3 is activated to rotationally drive the screw shaft 4, and the traveling unit 10 is moved forward through the female screw portion 8. Upon receiving the force, the traveling unit 10 starts moving while being rapidly accelerated. Then, it reaches the same speed as the pipe P in a very short time (for example, in about 0.5 seconds), and the traveling unit 10 moves forward the distance B in the meantime. At this time, the pipe P is advanced so as to be inserted outside the cored bar 32 located in front of the cutting position of the cutting machine 20.

When the traveling unit 10 reaches the same speed as the pipe P, the cutting machine 20 maintains the speed.
The first pipe clamp 14 located immediately in front of the clamp arm 14 is actuated, and the operation of the fluid pressure cylinder 14c causes the clamp arm 14
e is closed and the first pipe clamp 14 grips the pipe P. At the same time, the cutting machine 20 operates, the cutting motor 31 starts to rotate the rotating body 23, and the fluid pressure cylinder 28 operates to rotate the pair of cutting blades 21 and 21 while rotating the central pipe P. The cutting blades 21 and 21 are swung while pressing the cutting blades 21 and 21 against the outer periphery of the pipe P. As a result, the cutting blades 21 and 21 are pressed against the outer periphery of the pipe P while being driven to rotate, and the pipe P is cut at a predetermined length position.

At this time, since the cored bar 32 is inserted into the inside of the pipe P and the inner blade 32a is located inside the cut portion, the cutting blades 21 and 21 press the disc-shaped blade from the outside of the pipe P. When driven to rotate and cut, the inner blade 32a supports the cut portion of the pipe P from the inside. Therefore, the pipe P is cut at a good cut surface without crushing the cut portion of the pipe inward. The cutting is performed in a very short period of time, for example, about 1.5 seconds until the traveling unit 10 starts traveling and the cutting machine 20 finishes the cutting.

When the cutting is completed, as shown in FIG. 8, with the first pipe clamp 14 holding the cut cutting pipe Pc, the long cylinder 33 is pulled back to move forward along the upper rail 13. To do. At this time, the first core bar clamp 16 opens the clamp arm 16f by the operation of the fluid pressure cylinders 16C and 16C, releases the grip of the core bar 32, and releases the first pipe clamp 14 and the pipe Pc.
Allow forward movement of. At this time, the cored bar 32 is gripped by the second cored bar clamp 17.

The first pipe clamp 14 is the cutting pipe Pc.
When gripping and moving forward, the second pipe clamp 15 has its clamp arm 15f opened, and the cut pipe Pc cut into it enters the second pipe clamp 15 from the first pipe clamp 14 to the first pipe clamp 14 as shown in FIG. It is replaced by the two pipe clamp 15. That is, the first pipe clamp 14 that has advanced to the forward end opens the clamp arm, and the clamp arm 15f of the second pipe clamp 15 closes to cut the cutting pipe Pc.
Is held by the second pipe clamp 15. At this point, the traveling motor 3 starts reverse rotation drive,
The screw shaft 4 rotates in the opposite direction, the traveling unit 10 starts the backward movement, returns to the original position again in a very short time, and stops. In addition, the first pipe clamp 14
Also, due to the pushing operation of the long cylinder 33, it also moves backward and returns to the origin position immediately before the cutting machine 20.

On the other hand, the second pipe clamp 15 holding the cutting pipe Pc advances the upper rail 13 to the forward end by the pullback operation of the long cylinder 34, as shown in FIG. At this time, the second mandrel clamp 17 opens its clamp arm 17f to allow the cutting pipe Pc to slide and move outside the mandrel 32, while the clamp arm 16c of the first mandrel clamp 16 is closed, The gold 32 will be gripped by the first core metal clamp 16. Then, the second pipe clamp 15 opens its clamp arm 15e and carries out the cutting pipe Pc to a lower carrying-out chute or the like. Then, the second pipe clamp 15 is returned to the origin position of FIG. 1 by the operation of the long cylinder 34, and the traveling unit 10 is fed again with the cutting machine 20 to the pipe P fed.
And the cutting machine 20 cuts the pipe P at the time when it catches up, and the cut pipe Pc is cut.
Is repeatedly carried out by the first pipe clamp 14 and the second pipe clamp 15.

In this way, the pipe P continuously fed
Is fed so as to be inserted outside the inner blade 32a of the cored bar 32 arranged at the cutting position of the cutting machine 20.
Cuts the pipe P by pressing the cutting blade against the outer circumference of the pipe P while rotating the driven rotary disk-shaped cutting blade, and the pipe P is cut without being crushed inward. It is possible to satisfactorily cut at high speed without generating burrs on the surface.

Although the metal pipe is cut in the above embodiment, it is also possible to cut a pipe made of synthetic resin or the like.
In addition, the cutting machine 20 is provided with two cutting blades 21.
It is also possible to provide one or more cutting blades. Further, in the above embodiment, two pipe clamps, the first pipe clamp 14 and the second pipe clamp 15, are provided,
A single pipe clamp can be used if the required travel stroke is obtained.

[0031]

As described above, according to the method and apparatus for traveling and cutting a pipe of the present invention, a pipe continuously fed from a manufacturing line or the like is provided outside the cored bar provided with the inner blade. With the inner blade inserted inside the pipe, the disc-shaped cutting blade that swivels with a driven rotary type presses against the outer circumference of the pipe to swivel to cut the pipe, so the pipe cutting point is inside. It can be cut at high speed without being crushed, and burrs do not occur on the cut surface, so that the traveling pipe can be cut with high quality.

[Brief description of drawings]

FIG. 1 is a front view of a traveling cutting device showing an embodiment of the present invention.

FIG. 2 is a plan view of the traveling cutting device.

FIG. 3 is an enlarged sectional view taken along line III-III in FIG.

FIG. 4 is a left side view of the traveling cutting device.

5 is an enlarged cross-sectional view taken along line IV-IV of FIG.

FIG. 6 is an enlarged sectional view of a cutting position of the cutting machine 20.

7 is a front view of the traveling cutting device showing the operation when cutting the pipe P. FIG.

FIG. 8 is a front view of the traveling cutting device showing the operation of feeding the cut pipe Pc.

FIG. 9 is a front view of the traveling cutting device showing an operation of carrying out the cut pipe Pc.

[Explanation of symbols]

2-rail 3-Traveling motor 4-screw shaft 8-Female thread 10-travel unit 14-First pipe clamp 15-Second pipe clamp 16-First core bar clamp 17-Second core bar clamp 20-cutting machine 21-cutting blade 32-core 32a-inner blade

Claims (4)

[Claims] 1. A traveling cutting method of a pipe, wherein a pipe fed continuously is cut into a predetermined size by a cutting machine that travels at the same speed as the pipe, and the pipe is arranged at a cutting position of the cutting machine. The step of feeding the pipe so as to pass the tip of the pipe to the outside of the inner blade of the end of the core bar, and the tip of the pipe passes through the cutting position, and the protruding length of the pipe from the cutting position is When a predetermined length is reached, starting the movement of the cutting machine in the pipe feeding direction, accelerating the cutting machine to the same speed as the feeding speed of the pipe, and an accelerating operation of the cutting machine. Thus, when the protruding length of the pipe becomes a predetermined cutting length and the moving speed of the cutting machine matches the feeding speed of the pipe, the pipe clamp grips the cutting tip side of the pipe and the driven rotation of the cutting machine. A swivel disc-shaped cutting blade pushes on the outer circumference of the pipe at the cutting position. A step of attaching and swiveling to cut the pipe, and a step of advancing the pipe clamp to carry out the cutting pipe with the pipe clamp gripping the cutting pipe that has finished cutting. Characteristic pipe running cutting method. 2. A traveling cutting device for a pipe, which cuts continuously fed pipes to a predetermined size by a cutting mechanism that travels at the same speed as the pipes, and moves in the feeding direction of the pipes. A traveling unit that travels, and a plurality of driven rotary swivel disc-shaped cutting blades that can move together with the traveling unit, and the pipe is rotated while the plurality of cutting blades are swung at the outer peripheral portion of the cutting portion of the pipe. A cutting machine that presses against the outer peripheral surface to cut the pipe; a cored bar provided at the end with an inner blade that is inserted into the pipe at the cutting position and arranged at the same axial center position as the pipe to be fed; A cored bar clamp that is provided in the traveling unit and supports the cored bar coaxially with the axis of the pipe; and a cutout pipe that is provided in the traveling unit and that grips the cut portion of the pipe and cuts the cut pipe. A gripper that moves in the carry-out direction The clamp and the tip of the pipe pass through the cutting position, and when the protruding length of the pipe from the cutting position reaches a predetermined length, the cutting machine and the traveling unit are moved in the pipe feeding direction. Start and
A traveling cutting device for a pipe, comprising: a traveling drive mechanism that accelerates the cutting machine and the traveling unit to the same speed as the feeding speed of the pipe. 3. The pipe clamp comprises a first pipe clamp and a second pipe clamp which are arranged at intervals along the movement direction, and are arranged so as to be movable in the traveling unit by a movement drive mechanism. 3. The traveling cutting device for a pipe according to claim 2, wherein the cutting pipe is transferred from the grip of the first pipe clamp to the grip of the second pipe clamp. 4. The cored bar clamp comprises a first cored bar clamp and a second cored bar clamp, which are arranged at intervals along the moving direction, and carry out a cutting pipe cut from the pipe clamp. 3. The pipe running / cutting device according to claim 2, wherein, when the cutting is performed, substantially both ends of the cored bar are alternately gripped to operate so as to permit the carry-out movement of the cutting pipe inserted into the outer periphery of the cored bar.