JP2009241078A - Burr-less flying cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a burr-less flying cutter which does not adopts the conventional mechanical removal of the burr, such as beating or shaving of burrs and can more easily and clearly remove the burrs than a mechanical removal process by injecting the high pressure gas in molten-metal state. <P>SOLUTION: The burr-less flying cutter is provided with: torches 12, 13 for gas-cutting, disposed at the upper part of a billet 11, having a gap; and burr-removing means 14, 15 simultaneously shifting together with the torches 12, 13 for gas-cutting, just below the billet 11 in the gas-exhausting direction of the torches 12, 13 for gas-cutting. The burr-removing means 14, 15 are disposed so as to surround a gas cutting-off hole 22 formed at the lower part of the billet 11, and at the inside slant upper part, a nozzle tube 20 provided with a spouting hole 23 for blowing out gas-stream for removing the burr source around the gas cutting-off hole 22, and a gas feeding tube 21 for feeding the high pressure gas into the gas tube 20, are provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a burr-less running cutting device that suppresses the generation of burrs that are product defects caused by the molten metal of a cutting material (slab) that is generated during gas cutting in a continuous casting facility hanging and solidifying under the cutting material. About.

In continuous casting equipment, gas cutting machines are most commonly used for cutting slabs. However, the molten metal of the cutting material generated by gas cutting hangs down to the lower part of the cutting material and solidifies as a product defect. The resulting burr is produced.

As for the method for removing the burrs that are product defects, a hammer group that is solidified after cutting of the slab proposed in Patent Document 1 and sticks to the lower part of the slab and protrudes by centrifugal force from the rotating rotor. There are a method of knocking down, a method of attaching a blade to a rotating roller proposed in Patent Document 2 and Patent Document 3, rotating the blade, and scraping off, and a method of pressing the blade against the lower part of the slab from a lower portion which is not illustrated.
In addition, there is a method in which a rotating body such as an abacus ball is moved in synchronization with a gas cutting torch during cutting as proposed in Patent Document 4 and solidified burrs are removed during cutting. is there.
JP 2002-103128 A JP 2002-44954 A Japanese Utility Model Publication No.57-7663 Japanese Utility Model Publication No. 62-67660

However, since all of the techniques described in Patent Documents 1 to 4 are methods for removing solid burrs after cutting a slab, it is necessary to use a large-scale device, which requires a large amount of equipment costs. It was.
And since the technique of patent documents 1-4 was a method of removing the burr | flash after the molten metal of the cutting material produced by gas cutting hangs down to the lower part of a cutting material, and solidified, it was a big electric power. There was also a problem of needing.

The present invention has been made in view of such circumstances, and it is possible to add a simple device to the conventional gas cutting device, not the conventional removal of mechanical burrs such as `` hitting and scraping burrs ''. Another object of the present invention is to provide a burr-less running cutting device that can easily remove burrs more easily than mechanical removal by injecting high-pressure gas in a molten metal state.

The variless running cutting device according to the first invention that meets the above-mentioned object is a running cutting device that gas-cuts a slab cast by a continuous casting facility,
A gas cutting torch arranged with a gap above the slab, and a gas cutting torch that simultaneously moves in pairs with the gas cutting torch immediately below the slab in the gas discharge direction of the gas cutting torch. Burr removing means, and the burr removing means is disposed so as to surround a gas cutting opening formed at a lower end of the slab, and an air flow that removes a burr source around the gas cutting opening obliquely upward on the inner side. A nozzle pipe having a jet outlet for blowing out the gas, and an air feed pipe for sending high-pressure gas to the nozzle pipe.

The variless running cutting device according to the second invention is the variless running cutting device according to the first invention, wherein the nozzle tube is circular and the center of the nozzle tube is on the axis of the gas cutting torch. Is arranged.
The variless running cutting device according to the third invention is the variless running cutting device according to the first invention, wherein the nozzle tube is U-shaped, and the arc center of the U-shaped arc portion is It is arranged on the axis of the gas cutting torch.

And the variless running cutting apparatus which concerns on 4th invention uses the air, nitrogen gas, or argon gas as said high pressure gas in the variless running cutting apparatus which concerns on 1st-3rd invention.

According to the present invention, a simple device is added to the conventional gas cutting device, and it is easy to inject a high-pressure gas in a molten metal state instead of removing mechanical burrs such as hitting and cutting. In addition, it is possible to remove burrs more finely than mechanical removal.
Therefore, the equipment configuration is relatively simplified.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is a plan view of a variless travel cutting device according to the first embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a plan view of a burr removing means used in the variless travel cutting device. 4 and FIG. 4 are diagrams for explaining the operation of the burr removing unit. FIG. 5 is a plan view of the burr removing unit of the burr-less running cutting apparatus according to the second embodiment of the present invention. FIG. It is explanatory drawing.

As shown in FIG. 1 to FIG. 4, the variless running-cutting device 10 according to the first embodiment of the present invention has a predetermined slab 11 continuously cast by a known continuous casting equipment (not shown). The slab 11 is attached to the gas cutting device according to the dimensions, and is disposed immediately below the slab 11 with a gap above the slab 11 and the gas cutting torches 12 and 13. Burr removing means 14, 15 disposed on the lower side, and support members 16, 17 connecting the burr removing means 14, 15 and the gas cutting torches 12, 13. These will be described in detail below.

The gas cutting torches 12 and 13 are normal gas cutting torches, each of which is a known lateral movement means (not shown) in the carriage 18 that moves in the direction of travel of the slab 11 in synchronization with the moving speed of the slab 11. Z). The lateral movement means moves in a direction perpendicular to the traveling direction of the carriage 18, and the left and right gas cutting torches 12 and 13 simultaneously cut the slab 11, as shown in FIG. In FIG. 1, for easy understanding, it is described that the slab 11 is stationary and the left and right gas cutting torches 12 and 13 are moved orthogonally to the flow direction of the slab 11. Performs an oblique movement with respect to the conveying line, and cuts the slab 11 in a running direction in a direction perpendicular to the traveling direction.

One of the left and right gas cutting torches 12 and 13 cuts the slab 11 from the center to the near side, and the other then cuts beyond the center of the slab 11. In this embodiment, two gas cutting torches 12 and 13 are used. However, the present invention is also applied to the case where the entire width of the slab 11 is cut by using one gas cutting torch. The

Each gas cutting torch 12, 13 is provided with burr removing means 14, 15 in pairs in the gas discharge direction via U-shaped support members 16, 17. In this embodiment, the burr removing means 14, 15 is a circular nozzle tube 20 arranged in alignment with the gas cutting torches 12, 13 in plan view, and sends high-pressure air to the nozzle tube 20. Each has a trachea 21. The nozzle tube 20 is cut and formed by the gas cutting torches 12 and 13 and is disposed so as to surround the gas cutting port 22 formed at the lower end of the slab 11. A jet outlet 23 that blows out an air stream that removes burrs attached to the periphery of the gas cutting opening 22 is provided obliquely above the inner side of the nozzle tube 20.

The air supply pipe 21 can be disposed below the support members 16 and 17, and can also be used as a part of the support members 16 and 17. A compressed gas source (not shown) is disposed at the base of the air supply pipe 21 via a flow rate adjusting valve. The compressed gas source is, for example, air compressed to 1 to 5 atm, nitrogen, argon, or the like, and the flow rate is adjusted via a flow rate adjusting valve to be ejected from the nozzle tube 20. ing.

The inner radius of the nozzle tube 20 is, for example, 2 to 10 times the diameter of the gas cutting port 22 which is the same as the width cut by the gas cutting torches 12 and 13, more specifically, from the cutting flame 25 to 10. It is preferable that the cutting flame 25 is not directly applied at a position separated by 50 mm. For example, 10 to 30 nozzles 20 are provided around the nozzle tube 20 at an angle of 30 to 60 degrees with respect to the vertical.

Then, operation | movement and effect of this variless running-cutting apparatus 10 are demonstrated.
The slab 11 is cut by the cutting flame 25 from the gas cutting torches 12 and 13 of the variless running cutting device 10. At this time, the molten metal 26 (and its oxide) serving as a burr source hangs down at the bottom of the slab 11 to generate burrs.

Accordingly, the nozzle tube 20 constituting the burr removing means 14 and 15 with the slab 11 sandwiched between the gas cutting torches 12 and 13 and the cutting flame 25 coming out below the slab 11 is provided with the gas cutting torches 12 and 13. Therefore, the nozzle tube 20 moves in synchronization with the gas cutting torches 12 and 13.

Since the nozzle 23 for injecting the high-pressure gas is provided obliquely upward on the inner side of the nozzle tube 20, the injection high-pressure gas from the nozzle 23 forms the molten metal 26 that is generated by cutting into a circular shape. It sprays so that it may surround, and moves the molten metal 26 toward the cutting flame 25 toward the center. As a result, the molten metal 26 collected at the center by the cutting flame 25 is blown downward, and the molten metal 26 that becomes a burr can be removed.

Further, the injection pressure of the injection high-pressure gas is preferably set to a pressure at which the molten metal 26 is smoothly blown downward by the cutting flame 25 at the same time as it does not adversely affect the cutting flame 25 as the pressure of the cutting flame 25 or less. The high-pressure gas to be injected is usually air, but depending on the composition of the slab, nitrogen gas or argon gas may be used so as not to adversely affect the slab quality. In FIGS. 1 and 2, 27 is a roll, 28 is a wheel of the carriage 18, and 29 is a rail.

Next, a variless running-cutting device 30 according to a second embodiment of the present invention shown in FIGS. 5 and 6 will be described.
In this embodiment, the nozzle tube 32 constituting the burr removing means 31 is U-shaped, and is larger in a similar manner to the shape of the cut portions of the gas cutting torches 12 and 13 of the slab 11.
Accordingly, when the nozzle tube 32 is viewed in plan, the arc center of the semicircular arc portion 33 coincides with the axis of the gas cutting torches 12 and 13, and the inside thereof is the cutting flame 25, that is, the gas cutting port 22. 10-50 mm away from the periphery.

The air supply pipe 35 that sends the high-pressure gas to the nozzle pipe 32 is connected toward the outer side at the center position of the arc portion 33. In the nozzle tube 32, a large number of jet ports 36 are formed at a pitch of 3 to 8 mm obliquely upward on the inner side.

About the burr-less running cutting device 30 according to the second embodiment, since the other configuration and operation are the same as those of the burr-less running cutting device 10 according to the first embodiment, detailed description thereof is omitted. Since there is no gas injected from the rear side in the traveling direction with respect to the cutting flame 25, the cutting flame 25 is less disturbed. Further, since the nozzle tube 32 is not provided directly under the cutting groove formed by the gas cutting torches 12 and 13, there is an advantage that the nozzle tube 32 is not easily contaminated by a cutting rod or a burr.

It is a top view of the burr-less running cutting device concerning a 1st embodiment of the present invention. It is the same front view. It is a top view of the burr | flash removal means used for the burr-less running cutting apparatus. It is operation | movement explanatory drawing of the said burr | flash removal means. It is a top view of the burr | flash removal means of the burr-less running cutting apparatus which concerns on the 2nd Embodiment of this invention. It is operation | movement explanatory drawing of the said burr | flash removal means.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: Burrless running cutting apparatus, 11: Cast slab, 12, 13: Gas cutting torch, 14, 15: Burr removal means, 16, 17: Support member, 18: Carriage, 20: Nozzle pipe, 21: Air supply pipe , 22: gas cutting port, 23: jetting port, 25: cutting flame, 26: molten metal, 27: roll, 28: wheel, 29: rail, 30: variless travel cutting device, 31: burr removing means, 32: Nozzle tube, 33: arc portion, 35: air supply tube, 36: jet outlet

Claims (4)

A running cutting device for gas cutting a slab cast by a continuous casting facility,
A gas cutting torch arranged with a gap above the slab, and a gas cutting torch that simultaneously moves in pairs with the gas cutting torch immediately below the slab in the gas discharge direction of the gas cutting torch. Burr removing means, and the burr removing means is disposed so as to surround a gas cutting opening formed at a lower end of the slab, and an air flow that removes a burr source around the gas cutting opening obliquely upward on the inner side. A variless running-cutting device comprising: a nozzle pipe provided with a jet outlet for blowing air; and an air feed pipe for sending high-pressure gas to the nozzle pipe. The variless running cutting apparatus according to claim 1, wherein the nozzle tube has a circular shape, and a center of the nozzle tube is disposed on an axis of the gas cutting torch. apparatus. The variless running cutting apparatus according to claim 1, wherein the nozzle tube is U-shaped, and an arc center of the U-shaped arc portion is disposed on an axis of the gas cutting torch. A variless running-cutting device. The variless running cutting apparatus according to any one of claims 1 to 3, wherein air, nitrogen gas or argon gas is used as the high-pressure gas.

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