JP6707748B2 - Steel pipe material cutting device and cutting method - Google Patents

Description

The present invention relates to a steel pipe cutting apparatus and a cutting method for irradiating a heat cutting beam at a cutting point to cut a steel pipe.

Conventionally, in a production line that manufactures metal pipes, when cutting pipes that are continuously sent out to a predetermined length, a truck that travels at the same speed as the pipes that are sent out is equipped with a pipe clamp and a disk-shaped cutter. There is known a technique for cutting the pipe into a predetermined length by driving the cutter while driving the carriage at the same speed as the pipe sent from the manufacturing line by using the traveling cutting device described above. Reference 1 etc.).

By the way, in this type of pipe traveling cutting device, a disc-shaped cutter is rotationally driven to cut the pipe, and therefore the rotary blade of the cutter is moved in the radial direction of the pipe at least a distance corresponding to the diameter to cut the pipe. Therefore, there is a problem that it takes time to cut the pipe 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 cuts by pressing a free rotary blade, the cut end of the pipe is crushed inward. As described above, there is a problem that it easily deforms, and in the past, a process for correcting such burrs and deformation was necessary, which increased the required time and design constraints, and also caused the manufacturing cost to increase. ..

On the other hand, as a technique for reducing such burrs and deformation, a device for cutting a pipe by thermal cutting has been conventionally developed (see, for example, Patent Document 2). As this thermal cutting process, a laser cutting process device is known in which a laser beam from a thermal cutting process head provided above a pipe to be processed is irradiated from the outer peripheral surface side of the pipe toward the inside of the pipe. ..

JP-A-7-80797 JP, 9-155584, A

However, in the laser cutting apparatus as disclosed in the above-mentioned Patent Document 2, since the laser beam from the laser processing head is irradiated from the outer peripheral surface side of the pipe toward the inside of the pipe, spatter generated at the cutting portion. However, there is a problem in that they may remain on the inner surface of the pipe, or in some cases, they may adhere.

Therefore, the present invention is to solve the problems as described above, using a heat cutting beam to cut the pipe without causing burrs or deformation to improve productivity, while the pipe is being cut. An object of the present invention is to provide a cutting device and a cutting method for a steel pipe material capable of performing a cutting process in a clean state without depositing spatter on the inside.

(1) Cutting device for steel pipe material In order to solve the above problems, the present invention is a cutting device for irradiating a thermal cutting beam to cut a steel pipe material,
A feeding unit that continuously feeds the steel pipe material,
A cutting portion that irradiates the thermal cutting beam toward the outer peripheral surface of the cut portion of the steel pipe material to cut the steel pipe material.
A cutting member that moves the cutting portion relative to the steel pipe material and a rod member that is inserted into the steel pipe material at the cutting location and that extends along the axial direction of the steel pipe material,
Supported by the rod member in the steel pipe material at the cutting location, moved or rotated so as to face the irradiation direction of the thermal cutting beam, a shield plate for attaching spatter,
Along with the feeding direction of the steel pipe material, and following the movement of the steel pipe material, a follow-up drive unit that moves the cutting portion and the shielding plate ,
A rod that is arranged on the opposite side of the feeding portion of the cutting point and moves or rotates the steel pipe material while supporting the rod member from the feeding direction side of the steel pipe material so as to be insertable into the steel pipe material. A drive device,
A steel pipe material separated at the cutting point, the steel pipe material being moved relative to the cutting portion, and being conveyed forward in the feeding direction ,
A plurality of the rod driving devices are provided along the feeding direction with an interval longer than the length of the separated steel pipe material,
Each rod driving device has a mechanism for moving or rotating the rod member in a state where the rod member is gripped, and sequentially releasing the gripped state of the rod member as the separated steel pipe material passes. Then
The shielding plate is supported so as not to contact the inner surface of the steel pipe material by maintaining a distance between the rod member and the inner surface of the steel pipe material around the rod member.

In the above-described steel pipe cutting device, the rod member is a hollow tubular member, which is formed at a portion of the tubular member facing the cutting point, and which is a suction port communicating from the hollow interior to the outside of the tubular member. And a suction means for generating a negative pressure in the internal hollow portion, and it is preferable to suck the sputter together with the shielding/adhesion of the spatter by the shielding plate.

In the above-described steel pipe material cutting device, the cutting portion includes a plurality of laser heads for irradiating the thermal cutting beam, and the shielding plate has a plurality of facing surfaces arranged to face each of the plurality of laser heads. It is preferable to have

Further, in the above-described steel pipe cutting device, the cutting portion includes a pair of laser heads that irradiate the thermal cutting beam, and the pair of laser heads are arranged to face each other with a central axis of the steel pipe material interposed therebetween, It is preferable that the rod member is arranged along the axial direction of the steel pipe material, and the shielding plate is arranged along the radial direction of the steel pipe material at the tip of the rod member.

(2) Cutting method for steel pipe material The present invention also provides a cutting method for irradiating a thermal cutting beam at a cutting point to cut a steel pipe material,
A feeding step of continuously feeding the steel pipe material to the cutting point,
A cutting drive step of irradiating the heat cutting beam toward the outer peripheral surface of the cut portion of the steel pipe material to cut the steel pipe material, and moving the heat cutting beam relative to the steel pipe material, and the cutting point. Into the steel pipe material, the rod member extending along the axial direction of the steel pipe member is inserted, and the shield plate supported by the rod member is moved to face the irradiation direction of the thermal cutting beam or A shielding process to rotate,
Along said feed direction of the steel pipe, and by following the movement of the steel pipe, saw including a follow-up drive step of moving the cutting portion and the shielding plate,
On the side opposite to the feeding part of the cutting point, along the feeding direction, with a space longer than the length of the separated steel pipe material, a plurality of rod drive devices are arranged,
The steel pipe material separated at the cutting point is moved relative to the cutting portion and conveyed forward in the feeding direction,
Each rod driving device grips a rod member from the feeding direction side of the steel pipe material and moves or rotates the rod member while supporting the rod member so that the rod member can be inserted into the steel pipe material, and the separated steel pipe material. The gripped state of the rod member is sequentially released as the rod passes .

In the above cutting method, the rod member is an internal hollow cylindrical member, and a suction port that communicates from the internal hollow to the outside of the cylindrical member is formed at a portion of the cylindrical member facing the cutting point. In the cutting driving step, it is preferable that a negative pressure is generated in the internal hollow portion and suction is performed from the suction port.

In the above cutting method, the thermal cutting beam is irradiated from a plurality of laser heads in the cutting driving step, the shielding plate has a plurality of facing surfaces in the shielding step, and each facing surface has a plurality of laser heads. It is preferably moved or rotated so as to be opposed to each other.

In the above cutting method, the thermal cutting beam is irradiated from a pair of laser heads in the cutting driving step, the pair of laser heads are arranged to face each other with the central axis of the steel pipe material interposed therebetween, and the rod is used in the shielding step. It is preferable that the member is arranged along the axial direction of the steel pipe material, and the shielding plate is arranged at the tip of the rod member along the radial direction of the steel pipe material.

As described above, according to the cutting device and the cutting method of the present invention, since the steel pipe material is cut by irradiating the heat cutting beam, it is possible to efficiently cut the steel pipe material in a short time and to cut the cut surface. No burr or deformation occurs, and a process for removing or correcting the burr or deformation can be omitted. Further, in the present invention, since the shield plate arranged so as to face the irradiation direction of the thermal cutting beam is moved or rotated following the irradiation of the cutting beam and the movement of the steel pipe material, spatter generated at the cutting portion It is possible to prevent this from adhering to the inner surface of the steel pipe material, and to perform the cutting process while keeping the inside of the steel pipe material in a clean state.

Further, in the above invention, the rod member is a hollow cylindrical member, a suction port is formed in a portion facing the cutting point, and negative pressure is generated in the internal hollow portion to perform suction, so that the cutting portion is generated. The spatter that is generated can be sucked through the intake port and discharged to the outside of the steel pipe material through the rod member, and the inside of the steel pipe material can be maintained in a cleaner state.

As a result, according to the present invention, the heat cutting beam is used to cut the steel pipe material without causing burrs and deformation to improve the productivity, and during the cutting of the steel pipe material, spatter or the like is attached to the inside of the steel pipe material. It can be cut in a clean state without wearing it.

It is explanatory drawing which shows roughly the whole structure of the welded pipe manufacturing line which concerns on 1st Embodiment. It is a front view which shows the whole structure of the cutting device which concerns on 1st Embodiment. It is the side view seen from the pipe sending side of the cutting device concerning a 1st embodiment. It is a perspective view which shows the core metal 71 which concerns on 1st Embodiment. It is explanatory drawing which shows operation|movement of the laser head which concerns on 1st Embodiment typically. It is a perspective view showing a process in welding device 5 concerning a 1st embodiment. It is explanatory drawing which shows operation|movement of the cutting device which concerns on 1st Embodiment. It is a front view which shows the whole structure of the cutting device which concerns on 2nd Embodiment. It is a side view which shows notionally the pipe conveyance part which concerns on 2nd Embodiment. It is a side view which shows notionally the pipe conveyance part which concerns on 2nd Embodiment. It is explanatory drawing which shows operation|movement (at the time of cutting-work conveyance) of the cutting device which concerns on 2nd Embodiment. It is explanatory drawing which shows operation|movement (after workpiece|work conveyance) of the cutting device which concerns on 2nd Embodiment. It is explanatory drawing which shows the operation|movement of the laser head which concerns on the example of a change typically. It is explanatory drawing which shows the operation|movement of the laser head which concerns on the example of a change typically.

[First Embodiment]
(Structure of cutting device)
An embodiment of a cutting device according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is an explanatory view schematically showing the overall configuration of a welded pipe manufacturing line according to the present embodiment, FIG. 2 is a front view showing the overall configuration of a cutting device 1, and FIG. 3 is a pipe delivery of the cutting device 1. It is the side view seen from the side.

As shown in FIG. 1, in the welded pipe manufacturing line according to the present embodiment, a continuous strip-shaped plate T having a constant width and a strip is continuously fed from the uncoiler 100, and the fed plate T is a pair. After passing through the pressing rolls 101 and 102, a plurality of pairs of forming rolls 103 are gradually rolled into a C-shape. Then, in the welding device 5, the plate-shaped body T is pressed against the edges of both ends of the plate-shaped body heated when passing between the pair of molding rolls 52, 52, and is welded by the welding portion 51 to manufacture the pipe P. .. The manufactured pipe P is cut into predetermined lengths by the cutting machine 3 and stacked on the stock table 104.

The cutting device 1 according to the present embodiment is a device that irradiates a thermal cutting beam at a cutting point A1 to cut a pipe P that is a steel pipe material, and is a welding device that manufactures a steel pipe from the plate-shaped body T shown in FIG. It is a device having the functions of 5 to the cutting machine 3. Specifically, the cutting device 1 is a device that irradiates a thermal cutting beam at a cutting point A1 to cut a pipe P that is a steel pipe material, and in the present embodiment, a base 9 installed on a floor 10 is installed. A traveling unit 8 that moves on the base 9 is provided as a base, and the rod driving device 6 and the cutting machine 3 are installed on the traveling unit 8. A welding device 5 is fixedly installed on the base 9, and the welding device 5 is separated from the movement of the traveling unit 8.

The base 9 is a base installed on the floor 10. Rails 92 are laid on both sides of the base 9, and the traveling unit 8 is movably arranged on the rail 92. A screw shaft 91 for driving the traveling unit 8 to travel along the rail 92 is rotatably supported on the base 9 via bearings 91a and 91a. The tip side of the screw shaft 91 is connected to the rotating shaft of the traveling servomotor 2, and the screw shaft 91 is rotationally driven by the traveling servomotor 2.

The traveling unit 8 has two rectangular frame-shaped mounts 80 as a main body, and a female screw portion 81 is attached to a lower end thereof, and the female screw portion 81 engages with a rail 92 to travel. At the center of the traveling unit 8, a cutting machine 3 that cuts the pipe P by rotating a pair of laser heads 30a that irradiate a thermal cutting beam is disposed. A female screw portion 81 is attached to the bottom of the frame 80 of the traveling unit 8, and the screw shaft 91 is screwed into the screw hole of the female screw portion 81. As a result, the traveling unit 8 and the cutting machine 3 receive the driving force in the axial direction via the female screw portion 81 by the rotational driving of the screw shaft 91 by the traveling servomotor 2, and travel integrally along the rail 92. Be moved.

The welding device 5 is a device that constitutes a part of a feeding unit that continuously feeds the steel pipe material to a cutting point, and a plate-shaped body T continuously fed from the uncoiler 100 is shown in FIG. As described above, the both ends are abutted at the welding line PL by the forming rolls 52, which are rolled into a tubular shape, and the welding line PL is welded at the welding portion 51 to manufacture the pipe P. The formed pipe P is sequentially sent to the cutting machine 3. The cored bar 71 is inserted from the rear in the transport direction of the pipe P into the opening of the suture start portion T0 where the both edges are brought into contact with each other. On the outer periphery of the cored bar 71, for example, bearings, rollers, and other sliding means that are provided to project outward are arranged to maintain the distance between the cored bar 71 and the inner surface of the pipe P around the cored bar 71. In this way, the core metal 71 and the shield plate 72 may be prevented from coming into contact with the inner surface of the pipe P.

The cutting machine 3 is a device that cuts the pipe P at the cutting point A1, and includes a laser head 30a, 30a and a laser head rotation servomotor 31 for driving the laser head in the cutting device body 3a. There is. The cutting device body 3a is a frame that is fixed on the gantry 80 and moves relative to the pipe P together with the gantry 80. The laser head rotation servomotor 31 is a cutting drive unit that moves the laser heads 30a, 30a relative to the pipe P. The laser heads 30a, 30a are heat cutting beams directed toward the outer peripheral surface of the cut portion of the pipe P. It is a device for irradiating a laser beam and cutting the pipe P. In the present embodiment, the pair of laser heads 30a and 30a are arranged so as to face each other with the central axis of the steel pipe material interposed therebetween.

More specifically, the cutting machine 3 has a horizontal insertion hole 34 for introducing the pipe P of the object to be cut on the base, and the rotary plate 33 is rotatably arranged outside the insertion hole 34. A pair of laser heads 30a, 30a are supported on the front surface of the rotary plate 33. Then, as shown in FIG. 5, the pair of laser heads 30a, 30a pivot around the pipe P of the object to be cut by the rotation of the rotary plate 33. In this way, the pair of laser heads 30a are rotated with the rotation of the rotary plate 33, and the pipe P at the center is irradiated with the thermal cutting beam to cut the pipe P from the circumferential side.

The rod driving device 6 is a device having a function of driving the core metal 71 and sucking the spatter generated in the cutting machine 3. The rod driving device 6 includes a follow-up driving mechanism 62 and a suction mechanism 61 in the driving device body 6a. I have it. The drive device main body 6a is a skeleton that is fixed on the gantry 80 and moves relative to the pipe P together with the gantry 80. In the present embodiment, the rod driving device 6 is arranged on the upstream side of the welding device 5 in the pipe P transport direction so that the cored bar 71 is inserted into the pipe P from the rear of the pipe P in the transport direction. As a result, the cored bar 71 is inserted from the rear in the transport direction of the pipe P into the opening formed in the suture start portion T0 where the opposite ends of the plate-shaped body T are brought into contact with each other.

The follow-up drive mechanism 62 is a drive device that moves the sputter suction hole 71a and the shield plate 72 along the feed direction of the pipe P and following the movement of the pipe P. The suction mechanism 61 also includes suction means for generating a negative pressure inside the hollow portion of the cored bar 71.

The cored bar 71 is a rod member that extends along the axial direction of the pipe P so as to face the cutting location. In the present embodiment, the cored bar 71 is a hollow cylindrical member, and as shown in FIG. 4, a sputter suction hole 71a communicating from the internal hollow to the outside of the cored bar 71 is provided at a portion of the cored bar 71 facing the cutting point A1. Are formed. The shield plate 72 is a plate member arranged along the radial direction of the pipe P at the tip of the core metal 71, is supported by the core metal 71 inside the pipe P located at the cutting point A1, and is in the irradiation direction of the thermal cutting beam. Is moved or rotated so as to face.

More specifically, the cored bar 71 is a cylindrical member having a hollow inside and formed in a rod shape, and is arranged so as to be inserted into the pipe P when the pipe P is cut. In the present embodiment, the core metal 71 is arranged horizontally and substantially coaxially with the pipe P to be fed so that the shield plate 72 provided at the tip thereof is inserted into the insertion hole 34 in the center of the cutting machine 3. To be done. The shield plate 72 is moved or rotated so that it is always arranged at a position facing the laser head.

Further, a pipe gripping portion 4 for gripping and transporting the supplied pipe P is provided on the traveling unit 8. The pipe gripping unit 4 is a mechanism that grips the pipe P sent out through the cutting machine 3 and moves it relative to the cutting machine 3. After cutting the pipe P, the cut and separated pipe P is removed. It also functions as a transport unit that transports the stock table 104.

The pipe gripping unit 4 includes a clamp arm 45 that slides along the pipe support beam 40 with the pipe support beam 40 connected to the upper portion of the cutting device body 3a of the cutting machine 3 as a base. Is roughly composed of pipe holders 45a and 45b and a base 45c. More specifically, a lower rail 44 is horizontally attached to the lower side of the pipe support beam 40 along the longitudinal direction, and pipe holders 45a and 45b are engaged with the lower rail 44 in a suspended state so as to be movable. ing. The pipe holders 45a and 45b have a base 45c and an engaging portion 42 on the base 45c. The engaging portion 42 is engaged with the lower rail 44, and the pipe holders 45a and 45b can be moved by the operation of the elongated cylinder 43. The long cylinder 43 is arranged below the pipe support beam 40, and the screw is screwed into the screw portion of the engaging portion 42 of the base 45c. The pipe holders 45a and 45b are opened and closed by the operation of the fluid pressure cylinder to clamp the sent-out pipe P, and the pull-back operation of the long cylinder 43 sends the pipe P to the discharge side and conveys it along the lower rail 44. -It will be moved.

A rotary encoder is provided in the servo motor 41 for feeding the pipe holder, and the encoder outputs a signal that accurately indicates the traveling distance from the origin position of the traveling unit 8. Further, a sensor for detecting the origin position of the traveling unit 8 is provided, and a sensor for detecting the origin position and the transport end position of the pipe holders 45a and 45b are installed. Further, an encoder that outputs a signal that accurately indicates the moving distance of the pipe P is provided in the conveying device in the pipe P manufacturing line, and the signal that indicates the moving distance from the encoder is used as each drive unit of the traveling cutting device having the above-described configuration. It is input to a control device for controlling the motor and used to control each drive unit.

(Operation of steel pipe cutting device)
The steel pipe cutting method of the present invention can be carried out by operating the steel pipe cutting device described above. FIG. 7 is an explanatory diagram showing the operation of the cutting device 1.

First, as shown in FIGS. 1 and 2, the plate-like body T sent from the upstream uncoiler 100 is supplied to the cutting device 1 while being formed, and the pipe P is formed by the welding device 5. The pipe P is continuously fed at a constant speed into the main body 3a of the cutting device through the conveyance guide 31a at the center of the cutting machine 3.

At this time, as shown in FIG. 7A, the traveling unit 8 is located at the rear end of the base 9, and the welding device 5 is located at the rear end of the pipe gripping portion 4, that is, at the cutting machine 3 side. It is in a state of closeness. Then, when the protruding length L from the cutting position of the cutting machine 3 at the tip of the pipe P reaches a predetermined length, the clamp arm 45 is closed and the pipe P is gripped.

With the pipe P gripped, the clamp arm 45 moves forward along the lower rail 44 by the pullback operation of the long cylinder 43, as shown in FIG. 7B. Next, when the cutting position reaches the laser heads 30a, 30a, as shown in FIG. 7C, the laser heads 30a, 30a emit a beam to start cutting. During this time, the traveling unit 8 moves at the same speed as the traveling of the pipe P, and the cutting machine 3 stands still with respect to the pipe. In the traveling unit 8, the rotating plate 33 rotates and cuts the outer peripheral surface of the pipe P. At this time, the shield plate 72 arranged so as to face the irradiation direction of the thermal cutting beam is moved or rotated following the irradiation of the cutting beam and the movement of the pipe P to receive the spatter generated at the cutting point A1. At the same time, the spatter generated at the cutting portion is sucked through the sputter suction hole 71a and discharged to the outside of the steel pipe material through the core metal 71.

Then, the pipe P is cut and separated, and is conveyed forward on the lower rail 44 while being held by the clamp arm 45. The grip of the clamp arm 45 is released at the tip of the lower rail 44, and the pipe P is discharged. Along with this, the traveling unit 8 is slid backward, and the laser heads 30a, 30a are moved backward relative to the pipe P and moved to the next cutting position.

(Action/effect)
According to the embodiment described above, since the pipe P is cut by irradiating the thermal cutting beam, the steel pipe material can be efficiently cut in a short time, and the cut surface is free from burrs and deformation. It is possible to eliminate the step of removing or correcting the burr and the deformation. Further, in the present embodiment, since the shield plate 72 arranged so as to face the irradiation direction of the thermal cutting beam is moved or rotated following the irradiation of the cutting beam and the movement of the pipe P, at the cutting point A1. It is possible to avoid the spatter that is generated and prevent it from adhering to the inner surface of the pipe P, and it is possible to carry out the cutting process while keeping the inside of the pipe P in a clean state. At the same time, a negative pressure is generated inside the core metal 71 to suck air, so that spatter generated at the cutting portion is sucked and discharged to the outside of the pipe P through the rod member, so that the inside of the pipe P is in a cleaner state. Can be kept at

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the first embodiment described above, the cored bar 71 is inserted into the cutting point A1 from the rear side in the transfer direction of the pipe P, but in the present embodiment, the gist is to insert the cored bar 71 from the front side in the transfer direction. FIG. 8 is a front view showing the overall configuration of the cutting device 1. In the present embodiment, the same components as those in the above-described embodiment are designated by the same reference numerals, and the functions and the like are the same unless otherwise specified, and the description thereof will be omitted.

(Structure of cutting device)
In the embodiment described above, the cored bar 71 that shields and sucks the spatter generated in the cut portion is inserted into the pipe from the rear in the transport direction of the pipe P. However, in the present embodiment, the front in the transport direction of the pipe P. Insert into the pipe from. In this case, the rod driving device 6 that rotationally drives the core metal 71 and sucks the inside is arranged in front of the traveling direction of the pipe P.

More specifically, in the present embodiment, as shown in FIG. 8, in place of the rod drive device 6 described in the above-described first embodiment, core bar holders 82a and 82b as a plurality of rod drive devices are replaced by pipes P. Are arranged along the feeding direction. On the gantry 80, two core metal holders 82a and 82b are arranged in front of the welding device 5 at the cutting point A1 in the feeding direction, and are separated on the gantry 80 along the feeding direction. The work P1 which is the formed steel pipe material is erected at an interval longer than the length of the work P1.

The core metal holders 82a and 82b are devices that move or rotate the steel pipe material while supporting the core metal 71 from the front side in the feeding direction of the pipe P so that the core metal 71 can be inserted into the pipe P. Further, each cored bar holder 82a, 82b has a mechanism for moving or rotating the cored bar 71 while holding the cored bar 71 and sequentially releasing the gripped state of the cored bar 71 as the work P1 passes. Have

Specifically, as shown in FIG. 10(a), the core metal holders 82a, 82b, 82b have openings 86 formed in the main body portion 84 of the core metal holders 82a, 82b 82b, which penetrate the front and back sides in the feeding direction. The cored bar 71 is inserted into the opening 86. On the inner side surface of the opening 86, a plurality of rotary chucks 85 are provided that are moved inward and backward from the peripheral edge of the opening 86. The rotary chuck portion 85 is a roller member that is rotated around a rotary shaft 85a parallel to the feeding direction, as shown in FIG. 7B, and is projected inward from the peripheral edge of the opening 86. As a result, the outer peripheral surface of the cored bar 71 is pressed to grip the cored bar 71, and the cored bar 71 that has been gripped is driven and rotated by the rotation of each rotary chuck portion 85.

Further, the main body portion 84 of the core metal holders 82a, 82b, 82b is divided into right and left in the horizontal direction orthogonal to the feeding direction, and is divided along the rail 83 as shown in FIG. 10(c). By sliding the main body portions 84, 84 left and right, the main body portions 84, 84 are opened and closed left and right. By opening and closing the main body portions 84, 84 left and right in this way, the opening 86 is divided into a pair of arcs, the rotary chuck portion 85 is separated from the outer peripheral surface of the cored bar 71, and the grip state with respect to the cored bar 71 is obtained. Is released. In the state where the divided main body portions 84, 84 are opened left and right, the core metal 71 is opened, and the clamp arm 45 holds the space between the left and right opened main body portions 84, 84. P1 can be passed while the core metal 71 is still inserted.

The pipe holders 45a and 45b of the clamp arm 45 move the workpiece P1 which is the steel pipe material separated at the cutting point A1 relative to the cutting machine 3 and feed the same as in the first embodiment. It is a conveying means for conveying forward in the feeding direction. Specifically, as shown in FIG. 9, an opening 47 is formed in the main body of the pipe holders 45a and 45b so as to penetrate the front and back in the feeding direction, and the core bar 71 and the pipe P are formed in the opening 47. Is inserted. In the opening 47, the core metal 71 and the pipe P are inserted concentrically in the cross-sectional view, and the core metal 71 is inserted inside the pipe P. On the inner side surface of the opening portion 47, a plurality of chuck portions 46 that are moved inward and backward from the peripheral edge of the opening portion 47 are provided. The chuck portion 46 has a curved surface with an arc-shaped cross section that matches the outer peripheral surface of the pipe P at the tip portion thereof, and the chuck portion 46 projects inward from the peripheral edge of the opening 47, thereby The outer peripheral surface of P is pressed to grip the pipe P. Further, the pipe holders 45a and 45b are adapted to open the gripped state of the pipe P by moving the chuck portion 46 outward.

Further, in the present embodiment, the opening/closing coupler 73 that sucks the inside of the pipe P is provided on the front side in the feeding direction, and is rotated by 90° so as to be attached to and detached from the tip end portion of the cored bar 71. For example, while cutting the pipe P, the pipe P is fitted to the tip of the cored bar 71, rotated 90° at a timing at which the work P1 passes and separated from the cored bar 71, and retracted from the conveyance path of the work P1. It is supposed to do.

(Operation of steel pipe cutting device)
By operating the steel pipe cutting device according to the present embodiment described above, the steel pipe cutting method of the present invention can be carried out. 11 and 12 are explanatory views showing the operation of the cutting device 1.

First, as in the first embodiment, as shown in FIGS. 1 and 2, the plate-like body T sent from the upstream uncoiler 100 is supplied to the cutting device 1 while being formed, and is welded to the pipe P by the welding device 5. Is formed. The pipe P is continuously fed at a constant speed into the main body 3a of the cutting device through the conveyance guide 31a at the center of the cutting machine 3.

At this time, as shown in FIG. 11A, the traveling unit 8 is located at the rear end of the base 9, and the rear end side of the clamp arm 45 is close to the cutting machine 3 side. Then, when the protruding length L from the cutting position of the cutting machine 3 to the tip of the pipe P reaches a predetermined length, the clamp arm 45 is closed and the pipe P is gripped.

Specifically, the core metal 71 is inserted inward of the pipe P, and the chuck portion 46 is projected inward from the peripheral edge of the opening 47, thereby pressing the outer peripheral surface of the pipe P and pipe P. Is gripped (see FIG. 9). Further, in the cored bar holders 82a and 82b, the cored bar 71 is inserted through the opening 86, and the rotary chuck part 85 is projected inward from the peripheral edge of the opening 86, so that the outer peripheral surface of the cored bar 71 is fixed. The core metal 71 is pressed and gripped (see FIG. 10A). At the same time, the opening/closing coupler 73 is fitted to the tip of the cored bar 71 on the front side in the feeding direction in the pipe P.

Next, when the cutting position reaches the laser heads 30a, 30a, as shown in FIG. 11B, the laser heads 30a, 30a emit a beam to start cutting. During this time, the traveling unit 8 moves at the same speed as the traveling of the pipe P, and the pipe P stands still with respect to the cutting machine 3. In the cutting machine 3, the rotary plate 33 rotates to cut the outer peripheral surface of the pipe P. Further, at this time, the rotating chuck portion 85 of the core metal holders 82a and 82b is rotated to rotate the core metal 71, and the shielding plate 72 arranged so as to face the irradiation direction of the thermal cutting beam is irradiated with the cutting beam. Also, the pipe P is moved or rotated following the movement of the pipe P to receive the spatter generated at the cutting point A1, and the spatter generated at the cutting portion is sucked through the sputter suction hole 71a and the outside of the steel pipe material through the cored bar 71. To discharge. Specifically, as the rotary chucks 85 of the cored bar holders 82a and 82b rotate, the cored bar 71 is driven to rotate (see FIG. 10B). At the same time, the open/close coupler 73 sucks the inside of the core metal 71.

After that, as shown in FIGS. 11C to 12A, the pipe P is cut and separated as the work P1, and is conveyed forward on the lower rail 44 in a state of being gripped by the clamp arm 45. .. Along with this, the traveling unit 8 is slid backward, and the laser heads 30a, 30a are moved backward relative to the pipe P and moved to the next cutting position. At this time, the cored bar holders 82a and 82b support the cored bar 71 in the conveyed work P1, but sequentially release the gripped state of the cored bar 71 as the separated work P1 passes. Or hold it.

That is, immediately after the separated work P1 is gripped by the clamp arm 45 and starts relative movement with respect to the cutting machine 3, as shown in FIG. The main body portions 84, 84 of the holder 82b are opened and closed left and right (see FIG. 10C), and the gripped state with respect to the core metal 71 is released. In the state where the divided main body portions 84, 84 are opened to the left and right, the work P1 held by the clamp arm 45 is inserted through the core bar 71 between the main body portions 84, 84 opened to the left and right. Passed in the state of being left.

Then, when the work P1 passes through the cored bar holder 82b, as shown in FIG. 12(a), in the cored bar holder 82b near the cutting machine 3, the rotary chuck portion 85 projects inward from the peripheral edge of the opening 86. As a result, the core metal 71 is gripped (see FIG. 10A), and the main body portions 84, 84 of the core metal holder 82a adjacent to the stock table 104 on the front side in the feeding direction are opened and closed left and right (FIG. 10C). )), the gripped state of the cored bar 71 is released. In the state where the divided main body portions 84, 84 are opened to the left and right, the work P1 held by the clamp arm 45 passes between the main body portions 84, 84 with the core metal 71 inserted. To be done. Further, at the timing when the work P1 passes through the core bar holder 82a, the opening/closing coupler 73 is rotated by 90°, separated from the core bar 71, and retracted from the conveyance path of the work P1.

Then, at the tip of the lower rail 44, the chuck portions 46 of the pipe holders 45a and 45b are moved outward, the gripped state of the work P1 is released, and the gripping by the clamp arm 45 is released, and the work P1 is released. Is discharged. Thereafter, as shown in FIG. 12B, the clamp arm 45 moves the rail 44 on the return path in the direction opposite to the feeding direction, and approaches the cutting machine 3 at the rear end of the rail 44.

At this time, each core metal holder 82a, 82b sequentially releases or grips the core metal 71 as the clamp arm 45 passes, similarly to the outward path. That is, when the clamp arm 45 starts moving in the direction opposite to the feeding direction, the main body portions 84, 84 of the cored bar holder 82a are opened and closed to the left and right, and the gripped state with respect to the cored bar 71 is released. .. When the divided main body portions 84, 84 are opened to the left and right, the clamp arm 45 can pass between the main body portions 84, 84. At the same time, the opening/closing coupler 73 is fitted to the tip of the cored bar 71 on the front side in the feeding direction in the pipe P.

Further, when the clamp arm 45 passes through the cored bar holder 82b, as shown in FIG. 12(c), in the cored bar holder 82b, the rotary chuck portion 85 is protruded inward from the peripheral edge of the opening 86 and the cored bar. 71 is gripped. Specifically, the core bar 71 is inserted into the pipe P, the chuck portion 46 is moved outward, and the opening 86 is opened, so that the tip of the pipe P is opened in the clamp arm 45. The part 86 can be inserted, and the processing from FIG. 11A is repeated.

(Action/effect)
According to the embodiment described above, similarly to the above-described first embodiment, the pipe P is cut by irradiating the thermal cutting beam, so that the steel pipe material can be efficiently cut in a short time, and the cut surface can be cut. No burr or deformation occurs, and a process for removing or correcting the burr or deformation can be unnecessary. Further, in the present embodiment, since the shield plate 72 arranged so as to face the irradiation direction of the thermal cutting beam is moved or rotated following the irradiation of the cutting beam and the movement of the pipe P, at the cutting point A1. It is possible to avoid the spatter that is generated and prevent it from adhering to the inner surface of the pipe P, and it is possible to carry out the cutting process while keeping the inside of the pipe P clean. At the same time, a negative pressure is generated inside the core 71 to suck air, so that the spatter generated at the cutting portion is sucked and discharged to the outside of the pipe P through the rod member, so that the inside of the pipe P is in a cleaner state. Can be kept at

In particular, in the present embodiment, the cored bar holders 82a and 82b grip the cored bar 71 to move or rotate the cored bar 71 from the front side in the feeding direction, and the cores are sequentially moved as the clamp arm 45 passes. Since the gripped state of the gold 71 is released, the mechanism for supporting and rotating the cored bar 71 can be brought close to the cutting point A1, the cored bar 71 can be firmly supported, and the cored bar 71 can be rotationally driven. It can be done more accurately.

[Modification]
The above description of each embodiment is an example of the present invention. Therefore, the present invention is not limited to the above-described embodiments, and various modifications can be made according to the design and the like as long as they do not depart from the technical idea of the present invention.

In each of the above-described embodiments, the pair of laser heads are arranged to face each other, but a single laser head may be used as shown in FIG. 13, for example. Also in this case, the shield plate 72 is arranged so as to be opposed to the laser head, and is driven so as to rotate or move following the rotation of the laser head. Further, as shown in FIGS. 14A and 14B, three laser heads arranged at 120° intervals or four laser heads arranged in a cross shape may be used. Also in this case, the shield plate 72 is formed with a plurality of facing surfaces that are arranged to face each of the plurality of laser heads.

According to such a modified example, it is possible to cut a steel pipe material by using a heat cutting beam without causing burrs and deformation to improve productivity, and to realize more diverse steel pipe material processing, and It is possible to cut in a clean state without spatter adhering to the inside of the steel pipe material during cutting.

A1... Cutting point P... Pipe P1... Work PL... Welding line 1... Cutting device 2... Traveling servomotor 3... Cutting machine 3a... Cutting device body 4... Pipe gripping part 5... Welding device 6... Rod drive device 6a... Drive Device main unit 8... Traveling unit 9... Base 10... Floors 30a, 30a... Laser head 31... Laser head rotating servo motor 31a... Transport guide 33... Rotating plate 34... Insertion hole 40... Pipe support beam 41... Pipe holder feeding Servo motor 42... Engaging part 43... Long cylinder 44... Lower rail 45... Clamp arm 45a, 45b... Pipe clamp 45c... Base 46... Chuck part 47... Opening part 51... Welding part 52, 52... Forming roll 61... Suction Mechanism 62... Follow-up drive mechanism 71... Core metal 71a... Sputter suction hole 72... Shielding plate 73... Opening/closing coupler 80... Frame 81... Female screw part 82a, 82b... Core metal holder 83... Rails 84, 84... Body part 85... Rotating chuck Part 85a... Rotating shaft 86... Opening part 91... Screw shaft 92... Rail 100... Uncoiler 101, 102... Roll 103... Forming roll 104... Stock table

Claims (8)

A cutting device for irradiating a heat cutting beam at a cutting point to cut a steel pipe material,
A feeding unit that continuously feeds the steel pipe material to the cutting point,
A cutting portion that irradiates the thermal cutting beam toward the outer peripheral surface of the cut portion of the steel pipe material to cut the steel pipe material.
A cutting member that moves the cutting portion relative to the steel pipe material, and a rod member that is inserted into the steel pipe material at the cutting location and that extends along the axial direction of the steel pipe material,
A shield plate that is supported by the rod member in the steel pipe material positioned at the cutting point and that is moved or rotated so as to face the irradiation direction of the thermal cutting beam,
Along with the feeding direction of the steel pipe material, and following the movement of the steel pipe material, a follow-up drive unit that moves the cutting portion and the shielding plate,
A rod that is arranged on the opposite side of the feeding portion of the cutting point and moves or rotates the steel pipe material while supporting the rod member from the feeding direction side of the steel pipe material so as to be insertable into the steel pipe material. A drive,
The steel pipe material separated at the cutting point is relatively moved with respect to the cutting unit, and a transport unit for transporting the feed direction forward,
A plurality of the rod driving devices are provided along the feeding direction with an interval longer than the length of the separated steel pipe material,
Each rod drive device has a mechanism for moving or rotating the rod member while holding the rod member and sequentially releasing the held state of the rod member as the separated steel pipe material passes. Then
A steel pipe cutting device, characterized in that the shielding plate is supported so as not to come into contact with the inner surface of the steel pipe by maintaining a distance between the rod member and the inner surface of the steel pipe surrounding the rod member. The rod member is a hollow cylindrical member inside,
A suction port formed in a portion of the tubular member facing the cutting point, the suction port communicating from the inner hollow to the outside of the tubular member;
Cutting device steel pipe according to claim 1, wherein, further comprising a suction means for creating a negative pressure in the interior hollow. The cutting unit includes a plurality of laser heads that irradiate the thermal cutting beam,
The steel pipe material cutting device according to claim 1, wherein the shielding plate has a plurality of facing surfaces that are arranged to face each of the plurality of laser heads. The cutting unit includes a pair of laser heads that irradiate the thermal cutting beam,
The pair of laser heads are arranged to face each other with the central axis of the steel pipe material interposed therebetween,
The rod member is arranged along the axial direction of the steel pipe material,
The steel pipe cutting device according to claim 1 or 2, wherein the shielding plate is arranged at a tip of the rod member along a radial direction of the steel pipe. A cutting method for irradiating a heat cutting beam at a cutting point to cut a steel pipe material,
A feeding step of continuously feeding the steel pipe material to the cutting point,
A cutting drive step of irradiating the heat cutting beam toward the outer peripheral surface of the cut portion of the steel pipe material to cut the steel pipe material, and moving the heat cutting beam relative to the steel pipe material, and the cutting point. A rod member extending along the axial direction of the steel pipe member is inserted into the steel pipe member positioned at, and the shield plate supported by the rod member is opposed to the irradiation direction of the thermal cutting beam. A shielding step of moving or rotating to,
Along the feeding direction of the steel pipe material, and following the movement of the steel pipe material, including a following drive step of moving the cutting portion and the shielding plate,
In opposite to the feeding portion of the cutting point, along the feed direction, spaced a longer distance than the length of the cutoff piece steel pipe material, by arranging a plurality of rod driving device,
Steel pipe material separated at the cutting point, relative movement to the cutting portion, and conveyed forward in the feeding direction,
Each rod driving device grips a rod member from the feeding direction side of the steel pipe material and moves or rotates the rod member while supporting the rod member so that the rod member can be inserted into the steel pipe material, and the separated steel pipe material. With the passage of the, the gripping state of the rod member is sequentially released,
In the shielding step, a method of cutting a steel pipe material, characterized in that a distance between the rod member and an inner surface of the surrounding steel pipe material is maintained so that the shielding plate does not contact the inner surface of the steel pipe material. The rod member is an internal hollow tubular member, and a suction port that communicates from the internal hollow to the outside of the tubular member is formed at a portion of the tubular member facing the cutting point.
The method for cutting a steel pipe material according to claim 5, wherein, in the cutting driving step, a negative pressure is generated in the inner hollow to suck air from the suction port. In the cutting drive step, the thermal cutting beam is emitted from a plurality of laser heads,
The shielding plate has a plurality of facing surfaces in the shielding step, and each facing surface is moved or rotated so as to be arranged to face each of the plurality of laser heads. 6. The method for cutting a steel pipe material according to item 6. In the cutting driving step, the thermal cutting beam is irradiated from a pair of laser heads, and the pair of laser heads are arranged to face each other with the central axis of the steel pipe material interposed therebetween,
In the shielding step, the rod member is arranged along the axial direction of the steel pipe material, and the shielding plate is arranged along the radial direction of the steel pipe material at the tip of the rod member. Item 7. A method for cutting a steel pipe material according to item 5 or 6.