JPH10193098A - Method and device for gas cutting metallic material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the burden of deburring work by sucking the cutting gas generated in cutting and passing a metallic material by a gas suction member provided on a back side of the metallic material approximately and immediately below a gas cutting torch, and moving the gas suction member synchronous with the gas cutting torch to prevent adhesion of the cutting slag to the metallic material. SOLUTION: When a gas cutting torch 4 is moved on the surface of a slab 1, a gas suction member arranged on the back side is also synchronously moved. The air is blown out of an air-blow-out slit 30 into a passage 29 of an ejector 27, the cutting gas passing through the slab 1 is sucked by the air to be discharged from an open end part, and adhesion of the cutting slag 2 to be generated during the cutting to the back side of the slab 1 and generation of burrs are prevented. The inert gas is ejected into a clearance between the back side of the slab 1 and an outer circumferential surface of the gas guide body 28 from a fluid ejection slit 34 in a gas guide body 28 while the cutting gas is sucked. Erosion of the ejector 27 is prevented, and adhesion of the cutting slag 2 to the back side of the slab 1 is prevented to enable smooth movement of the gas suction member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for cutting a metal material such as a slab or the like using a combustible gas such as oxygen gas.

[0002]

2. Description of the Related Art FIG. 4 is a cross-sectional view showing the state of occurrence of cutting slag due to gas cutting of a conventional metal material. As shown in FIG. 4, in the conventional gas cutting of a metal material, an oxygen gas is injected from a gas cutting torch 4, and the slab 1 which is a metal material is melted and cut by heat generated by the combustion of the oxygen gas. In this case, the cutting slag 2 spreads around on the back surface of the slab 1 on the downstream side of the oxygen gas flow, contacts the back surface of the slab 1 at a lower temperature than the cutting slag 2, and solidifies. Adhere to. When rolling is performed in the next step with the burrs 3 adhered, the burrs 3 generate flaws on the surface of the rolled material.
Therefore, it is necessary to remove the burrs 3 after cutting the slab 1.

[0003] Further, as a conventional technique for removing the burr 3, a burr 3 is cut and scarfed by injection of oxygen gas, and a hammer type deburring apparatus in which a plurality of hammers are attached to the outer periphery of a roll. There are a method in which the roll is rotated and the burr 3 is mechanically beaten down with a hammer and removed, a method in which the burr 3 is mechanically scraped off with a blade, and a method in which the burr 3 is removed by grinding with a grinder or a shaver.

[0004]

However, in the case of the above-mentioned scarfing scarfing, secondary burrs are generated again during this scarfing work. Further, in the case of a hammer-type deburring apparatus, it is necessary to carry out the maintenance and repair of the hammer in a fine manner, and the repair cost for the hammer is enormous, and improvement thereof has been desired. Furthermore, in this case, if the slab is warped or the recognition of the cutting position is shifted, burrs may be left behind. Furthermore, when the burrs are mechanically scraped off with a blade, it is difficult to balance the pressing force of the blade with the moving force of the scraping, and burrs are left behind.

Further, in the case of grinding and removing, it is necessary for an operator to remove burrs in a batch process.
There are many problems in introducing such a technology to a mass production equipment line for rolling steel and the like. Further, in this grinding, there is also a problem that burrs cannot be removed hot.
In any of these cases, in addition to the fusing time of the steel material, a time for removing burrs is required. For this reason, there has been a problem that the temperature of the slab is lowered due to the deburring operation, particularly in hot direct rolling in which the continuous cast slab is directly fed to the rolling line.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to prevent a cutting stick generated by cutting of a metal material from adhering to the metal material, and to omit or reduce a deburring operation. It is an object of the present invention to provide a method and an apparatus for gas cutting of a metal material which can be performed.

[0007]

A gas cutting method for a metal material according to the present invention is characterized in that when cutting a metal material with a cutting gas injected from a gas cutting torch toward its surface side, the gas cutting torch is generally used. At a position directly below, a gas suction member disposed on the back side of the metal material cuts the metal material to suction the cutting gas that has passed therethrough, and moves the gas suction member in synchronization with the gas cutting torch. It is. The gas suction member is configured to inject a fluid around the cutting gas and between the gas suction member and the back surface of the metal material.

[0008] The gas cutting apparatus for a metal material according to the present invention comprises:
A gas cutting torch for injecting a cutting gas toward the front side of the metal material, and a gas arranged on the back side of the metal material at a position substantially immediately below the gas cutting torch, for cutting the metal material and sucking the cutting gas that has passed therethrough The apparatus includes a suction member, and a moving mechanism that moves the gas cutting torch and the gas suction member in synchronization. In addition, the gas suction member cuts the metal material, and a cylindrical ejector that sucks a cutting gas that has passed through by air supplied from the outside, and covers a gas suction side of the ejector, and cuts and passes the metal material. It has a trumpet-shaped space inside for guiding the cutting gas to the ejector, and has an annular gas guide body with a heat-proof lining on the outside, and a fluid supplied from the outside to the metal material back side of the gas guide body. A fluid ejection unit for ejecting the metal material toward the back surface is provided.

In the present invention, when the gas cutting torch cuts the metal material by injecting the cutting gas toward the front surface side of the metal material, the gas cutting torch is positioned substantially immediately below the gas cutting torch and is disposed on the back surface side of the metal material. The arranged gas suction member moves in synchronism with the gas cutting torch, cuts the metal material and sucks the cutting gas that has passed, thereby preventing the cutting stick generated by cutting the metal material from adhering to the metal material It is possible to prevent the occurrence of burrs and omit or reduce the deburring work.

[0010] Further, an annular gas guide member for guiding the cutting gas to the ejector by sucking the cutting gas which has passed through the cylindrical ejector of the gas suction member by cutting the metal material with air supplied from the outside, is provided on the outside. Is heat-insulated lining,
Since the fluid ejection portion provided in the gas guide is to inject the fluid around the cutting gas and between the gas guide and the back surface of the metal material, while preventing the ejector from being melted,
It is possible to further prevent the cutting stick and the metal from adhering to the metal material, and the injected fluid fills a gap between the back surface of the metal material and the outer peripheral surface of the gas guide, so that the gas suction member is smooth. It is ensured to move.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view showing the entirety of a gas cutting device for a metal material according to an embodiment of the present invention, FIG. 2 is a plan view showing the entire gas cutting device for the same metal material, and FIG. It is sectional drawing which shows the gas suction means of the gas cutting apparatus of the same metal material. In the figure, 1 is a slab which is a metal material, 2 is a cutting slab, 3 is a burr attached to the back surface of the slab 1, and 4 is a gas cutting torch. A moving mechanism 5 moves the gas cutting torch 4 and the gas suction member 6 in synchronization. The moving mechanism 5 includes a portal frame 7 running on the ground, a cutting torch moving device 8 for moving a gas cutting torch 4 movably mounted on a horizontal upper beam 7a of the portal frame 7, and a portal frame 7 A gas suction member moving device 10 for moving a gas suction member 6 movably mounted on a horizontal lower beam 9 having both ends connected below a pair of vertical portions 7b, a gas cutting torch 4 and a gas suction member 6. The cutting torch moving device 8 and the gas suction member moving device 10 are driven and controlled to move in synchronization with each other. 12 is slab 1
, A table roller for supporting the table rollers 13
2 is a support base that supports both ends.

The cutting torch moving device 8 is connected to two gas cutting torches 4 and pulls the two gas cutting torches 4, and two chains 20 a and a horizontal upper beam 7 a of the portal frame 7. Each chain 20 is provided on one end side.
a, and a first floating sprocket 22a provided on the other end of the horizontal upper beam 7a of the portal frame 7 and wound around each chain 20a. Each of the first driving sprockets 21a is provided with a cutting torch moving position detector 23 for detecting a moving amount of the gas cutting torch 4. Further, the gas suction member moving device 10 is connected to the two gas suction members 6 respectively,
Two chains 20b for pulling two gas suction members 6
A second driving sprocket 21b provided at one end of the horizontal lower beam 9 attached to the portal frame 7 to rotate each chain 20b, and a horizontal upper beam 7 of the portal frame 7.
and a second floating sprocket 22b wound around each chain 20b.

The movement control device 11 controls the cutting torch moving device 8 and the gas suction member moving device 10 to drive the first driving sprocket 21a and the second driving sprocket 21b, and is further attached to the first driving sprocket 21a. Based on the detection signal of the cutting torch moving position detector 23, the gas suction member moving device 10 is controlled so that the gas suction member 6 moves in synchronization with the gas cutting torch 4. Each gas suction member 6 is mounted on a traveling body 25 having wheels 26 traveling on rails 24 provided on the horizontal lower beam 9 attached to the portal frame 7. The gas suction member 6 includes a metal-made cylindrical ejector 27 that sucks the cutting gas by air, and a ceramic annular gas guide 28 that is integrally connected to the ejector 27 and guides the cutting gas to the ejector 27. It is composed of The ejector 2
Reference numeral 7 designates a passage 29 on the inner side, which is gradually thicker from the end to the center and narrows in the vicinity of the center from the end, and the slab position near the center of the inner peripheral surface constituting the passage 29. Are formed with an annular air blowing slit 30. An air supply pipe 31 communicating with the air blowing slit 30 is connected to the outer peripheral surface of the ejector 27.

The gas guide 28 has a trumpet-shaped passage 32 at one end side of the inside and gradually narrows toward the back.
And a box-shaped recess 33 covering one end of the ejector 27 at the other end of the inside, and a fluid ejection slit 34 as a fluid ejection part is provided on the entire outer peripheral surface at one end.
A fluid supply pipe 35 communicating with the fluid ejection slit 34 is connected to the outer peripheral surface on the other end side of the gas guide 28. The gas guide 28 has a recess 33 in the ejector 2.
7 is integrally connected to the ejector 27 so as to cover one end thereof.

Next, the operation of the metal material gas cutting apparatus of the above embodiment will be described. First, the movement control device 1
1, two first cutting torch moving devices 8 of the cutting torch moving device 8 such that the two gas cutting torches 4 move from the start positions on the left and right sides of the slab 1 to the center of the slab 1 respectively.
Each of the driving sprockets 21a is driven. And
Cutting is started simultaneously on the left and right sides by the two gas cutting torches 4 moving respectively. At this time, the movement control device 11
The gas suction member 6 is moved so that the gas suction member 6 moves in the state immediately below the cutting gas in synchronization with the gas cutting torch 4 based on the detection signal of the cutting torch moving position detector 23 attached to each first drive sprocket 21a. The second of the mobile device 10
Each of the driving sprockets 21b is driven.

When the cutting is completed to the vicinity of the center of the slab 1 in this manner, one of the gas cutting torches 4 stops the cutting gas and retreats to the start position. In the portion where the cutting near the center of the slab 1 remains, only the other gas cutting torch 4 is moved to complete the cutting of the slab 1 and retreat to the start position. At this time, the gas suction member 6 performs the same operation. The reason why the two gas cutting torches 4 and the two gas suction members 6 are used is to cut efficiently when the slab 1 is large, and to use one gas when the slab 1 is small. The gas cutting torch 4 and one gas suction member 6 may be used.

As described above, when each gas cutting torch 4 moves on the surface of the slab 1, each gas suction member 6 arranged on the back side of the slab 1 also moves in synchronization. At this time,
The air supplied from the air supply pipe 31 is blown out from the air blowout slit 30 into the passage 29 in which the vicinity of the center of the gas suction member 6 is narrower than the end of the ejector 27, and the air is discharged from the open end. Thus, the cutting gas that has passed through the cutting of the slab 1 is sucked by the air exhausted from the open end, and the cutting stick 2 generated by cutting the slab 1 is prevented from adhering to the back surface of the slab 1, and the burr is prevented. To prevent the occurrence of Therefore, the deburring operation can be omitted or reduced.

Further, when the ejector 27 cuts the slab 1 and sucks the cutting gas which has passed through the air,
The inert gas supplied from the fluid supply pipe 35 from the fluid ejection slit 34 provided on the outer peripheral surface on the slab rear surface side of the gas guide 28 is formed between the back surface of the slab 1 and the outer peripheral surface on the other end side of the gas guide 28. Since the gap is filled with the inert gas, the gap is filled with the inert gas, so that the ejector 27 is prevented from being melted, and the injected inert gas flows to the trumpet-like passage 32 of the gas guide 28 and the outside. It is possible to further prevent the cutting bar 2 and the base metal from adhering to the back surface of the slab 1.

As described above, since the slag is suctioned and removed at the same time as the cutting, a work process for removing burrs is not required, no labor and labor costs are required, and installation of an expensive deburring device as in the prior art is unnecessary. In addition, high repair costs are not generated, and heat loss due to useless transportation can be reduced.
Further, the gap between the back surface of the slab 1 and the outer peripheral surface of the gas guide 28 is filled with the injected inert gas, and at the same time, the gas guide 28 is not attracted to the slab 1 by the attraction force of the ejector 27. , Gas suction member 6
Is ensured to move smoothly.

In the embodiment of the present invention, the gap between the outer peripheral end surface of the gas guide 28 of the gas suction member 6 and the back surface of the slab 1 is preferably as small as possible, but is set to be approximately 0 mm to 10 mm. ing. Further, the ejector 27 of the gas suction member 6 employs an energy saving nozzle having a total exhaust gas amount that is about 20 times the amount of air supplied by the air supply pipe 31. Further, as a specific numerical value indicating the performance of the ejector 27, the supply air amount is 1.47 Nm ³ / min.
(At: 7 kg / cm ² ), the total amount of gas exhausted from the passage 28 of the ejector 27 to the outside is 2
9.4 nm ³ / mina and has become, this out, the exhaust gas amount generated by cleavage of the gas cutting torch 4 is a schematic 2.5 Nm ³ / min. The performance of the ejector 27 of the gas suction member 6 also changes the total amount of exhaust gas substantially in proportion to the supply pressure. Therefore, it can be used by changing according to the amount of exhaust gas generated by cutting.

In the present embodiment, the gas guide 28 provided with a heat-insulating lining of the gas suction member 6 is made of heat-resistant ceramic, but may be made of water-cooled copper. Further, it is desirable that the diameter of the trumpet-shaped passage 32 of the gas guide 28 be as small as possible, but it is expected that the gas cutting torch 4 will shift in the lateral direction or in the cutting direction. For this reason, the diameter of the gas guide 28 on the inlet side of the trumpet-shaped passage 32 is Φ60 mm assuming that the deviation is ± 20 mm, the diameter on the outlet side is Φ30 mm, and the depth is about 60 mm. These figures are based on the performance of the ejector 27 of the gas suction member 6 and the gas cutting torch 4.
It is not a fixed value because it changes depending on the maintenance state of Further, although the inert gas is ejected from the fluid ejection slit 34 of the gas guide 28, it is needless to say that a fluid such as air or water may be used. Further, the gas guide 28 has a fluid ejection slit 34 as a fluid ejection portion for ejecting an inert gas, but may have a plurality of fluid ejection holes.

[0022]

As described above, according to the present invention, when the gas cutting torch cuts the metal material by injecting the cutting gas toward the surface of the metal material, the metal material is placed almost immediately below the gas cutting torch. The gas suction member located on the back side of the tool moves in synchronization with the gas cutting torch, cuts the metal material and sucks the passing gas, so the cutting stick generated by cutting the metal material adheres to the metal material Can be prevented, the occurrence of burrs can be prevented, and the deburring operation can be omitted or reduced. Therefore, a work process for deburring is not required, no labor and labor costs are required, and no expensive deburring device is required as in the related art. This has the effect that the loss can be reduced.

Further, the cylindrical gas ejector of the gas suction member cuts the metal material and sucks the cutting gas which has passed therethrough by air supplied from the outside, and the annular gas guide for guiding the cutting gas to the ejector has an outer shape. Is heat-insulated lining,
Since the fluid ejection portion provided in the gas guide is to inject the fluid around the cutting gas and between the gas guide and the back surface of the metal material, while preventing the ejector from being melted,
It is possible to further prevent the cutting stick and the base metal from adhering to the metal material, and the injected inert gas fills a gap between the back surface of the metal material and the outer peripheral surface of the gas guide,
This has the effect of ensuring that the gas suction member moves smoothly.

[Brief description of the drawings]

FIG. 1 is a side view showing an entire metal material gas cutting device according to an embodiment of the present invention.

FIG. 2 is a plan view showing the whole of the metal material gas cutting device.

FIG. 3 is a cross-sectional view showing a gas suction member of the metal material gas cutting device.

FIG. 4 is a cross-sectional view showing a cutting slag generation state by a conventional gas cutting of a metal material.

[Explanation of symbols]

 Reference Signs List 1 slab (metal material) 4 gas cutting torch 5 moving mechanism 6 gas suction member 27 ejector 28 gas guide body 32 trumpet-like passage 34 fluid ejection slit (fluid ejection portion)

Claims (4)

[Claims] 1. A gas cutting method for a metal material, wherein the metal material is cut by a cutting gas injected from a gas cutting torch toward a front surface side of the metal material. A gas cutting method for a metal material, wherein the gas suction member cuts the metal material and sucks a cutting gas that has passed therethrough, and moves the gas suction member in synchronization with the gas cutting torch. 2. The metal material according to claim 1, wherein said gas suction member injects a fluid around said cutting gas and between said gas suction member and a back surface of said metal material. Gas cutting method. 3. A gas cutting torch for injecting a cutting gas toward a front surface side of a metal material, and a cutting machine disposed at a position substantially immediately below the gas cutting torch and on a back surface side of the metal material to cut and pass the metal material. A gas cutting device for a metal material, comprising: a gas suction member for sucking gas; and a moving mechanism for moving the gas cutting torch and the gas suction member in synchronization. 4. The gas suction member cuts a metal material and sucks a cutting gas that has passed therethrough by air supplied from outside, and covers a gas suction side of the ejector to cut the metal material. An annular gas guide body having a trumpet-shaped passage inside for guiding the cutting gas that has passed through to the ejector and having a heat-insulated lining on the outside, which is supplied from the outside to the metal material back side of the gas guide body. 4. A gas cutting apparatus for a metal material according to claim 3, further comprising a fluid jetting portion for jetting the fluid toward the rear surface of the metal material.