KR830000809B1 - Cutting device of continuous casting machine - Google Patents

Abstract

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Description

Cutting device of continuous casting machine

1 is a schematic diagram of a general continuous casting machine having a feed table and a cutting device.

2 and 3 are views showing a conventional cutting device, FIG. 2 is a side view, and FIG. 3 is a sectional view taken along line III-III of FIG.

4 and 5 are views showing a cutting device having a thermal cover according to the invention, Figure 4 is a side view, Figure 5 is a cross-sectional view taken along the line V-V of Figure 4.

Figure 6 is a cross-sectional view of the insulating cover of another embodiment of the present invention.

7 is a schematic representation of another embodiment of the present invention with a device for driving a cutting device frame.

8 is a schematic view of another embodiment of the present invention with a device for driving a thermal cover.

9 is a sectional view of another embodiment of a gripping mechanism of a cutting device.

10 is a cross-sectional view showing an example of a thermal insulation cover having an auxiliary heater.

The present invention relates to an apparatus for cutting a casting of a continuous casting machine, and more particularly, to an apparatus for cutting a casting continuously sent from the continuous casting machine while preserving the temperature of the casting.

As shown in FIG. 1, the continuous casting machine injects molten steel 2 in the mold 1 into the mold 3, wherein the molten steel injected into the mold injects the casting 4 of the desired shape in the mold. Form. The casting 4 is continuously sent to the next guide roller 5 via a delivery guide roller (hereinafter referred to as a guide roller) 5 on the horizontal feeder 6.

The cutting device 7 provided on the feed table 6 cuts the casting 4 to the desired length.

The cutting device 7 moves on the carriage 6 at the same speed as the casting 4, so that the cutting device 7 is continuously on the carriage 6 without disturbing the operation of the continuous casting machine. The casting 4 supplied can be cut.

2 and 3 are side and cross-sectional views of the transfer tray 6 and the cutting device 7 according to the related art. As shown, the carriage 6 has a front carriage 6a, a rear carriage 6c (the terms "front" and "rear" indicate a relative position relative to the direction of movement of the casting 4). And a lifting roller stand 6b. The cutting device 7 is a runner for movably supporting the frame 71 which hangs on the conveyer 6, and the frame 71 moving on the rail 8 provided thereon along one side of the conveyer 6. It consists of a runner 72, a clamp mechanism 73 and a cutting torque 74 supported by the frame 71 to be movable across the width of the casting 4.

As shown in FIG. 3, the clamp mechanism 73 extends laterally along the frame 71, and is supported by the frame and rotated to engage the grooved screw rod 731 and its screw rod 731. It consists of a pair of clamp cars 732. Since the screw rod 731 is rotated by the motor 734 provided with the reduction gear, the clamp rod 732 moves laterally. A horizontally movable clamp arm 735 is provided at the bottom of the clamp car 732, and a rod of the air cylinder 736 moving left and right is connected to the clamp arm 775. The motor 734 rotates the threaded rod 731 so that the clamp car 732 comes into close contact with both sides of the casting. The air cylinder 736 is then operated to process the casting 4 with the clamp arm 736.

The frame cutting torch 74 is secured to a laterally movable saddle 741 mounted on the frame 71. The saddle 741 assembled with the screw rod 743 rotated by the motor 742 with the reduction gear moves laterally with the rotation of the screw rod 743. The saddle 741 moves at a constant speed so that the cutting torch 74 moves from one side to the other side to cut the casting 4 in the width direction.

In order to cut the casting 4 with the cutting device 7, the clamp mechanism 73 is provided with the casting 4 by the desired length when the cutting point distant from the leading end of the casting 4 passes under the cutting device 7. Clamp both sides of the

The desired length is determined by a measuring device such as a measuring roll.

When the clamp is achieved, the cutting device 7 is moved simultaneously with the casting forward by the casting 4 via the frame 71 and the runner 72. At the same time, the torch 74 blows off the hot flame and starts cutting the casting 4.

When the casting 4 moves forward, the torch 74 moves laterally to cut across the casting 4. Upon completion of cutting, the clamp mechanism 73 is relaxed to stop the forward movement of the frame 72, the drive unit 75 returns the cutting device 7 to its original position, and prepares for the next cutting operation.

When the torch 74 is moved laterally at a constant speed, the completion of the cutting can be achieved by the time elapsed since the start of cutting. Operations such as stopping the cut, loosening of the clamp mechanism and returning to the original position of the cutting device 7 are automatically controlled by a sequence circuit with a reamer (not shown).

The cutting device 7 mainly moves on the lifting roller stage 6b. When the cut casting 4 passes on the lifting roller table 6b, the lifting roller 60b installed on the lifting roller object is lowered by the vertical movement mechanism 9, so that the feeding roller 6b is cut. Protected from flaking and cutting flames.

In the conventional method, the casting 4 cut to the desired length by the cutting device 7 is cooled in a cooling bed, cold-bonded or accumulated, and then reheated in a furnace and sent to a subsequent rolling device.

Solidification of the casting 4 is completed at a time when the casting 4 is moved onto the carriage 6 and passes through the guide roller 5. After completion of solidification, the casting 4 maintains a high temperature of at least 1000 ° C. Therefore, the conventional method is expensive in equipment of a cooling device and a heating furnace, and involves considerable energy loss. In order to eliminate this disadvantage, various attempts have been made in discharging and other so-called hot charging of the pre-cooled casting 4 which is transferred to the rolling process to heat the casting 4 in the furnace at a temperature suitable for the subsequent rolling process. However, because of the excessive temperature drop that occurred during the passage on the feeder 6 through the guide roller 5, the casting 4 was directly pressurized and involved significant heating in the furnace. In particular, the cutting of the casting 4 by the torch moving laterally requires a long time (for example, 2-5 minutes), during which the casting temperature falls to 100 ° C or more.

In addition, several thermostats have been proposed to prevent the temperature drop of the casting. However, in the vicinity of the transfer table 6, the cutting device 7 frequently moves back and forth. The model rod inserted before the start of casting is removed.

Scales and other impurities (hereinafter collectively referred to as scales) falling from the moving casting 4 are removed in the area.

In addition, many transfer rollers 60, drive mechanisms 601 and other devices therefor are installed in a limited space around them. Because of their shortcomings, a simple, compact and effective thermal insulation device, which is installed in a limited space and can reliably prevent the temperature drop of the casting 4, has not been practically used.

The present invention solves the above problems in cutting the casting produced in a continuous casting machine.

SUMMARY OF THE INVENTION An object of the present invention is to provide a casting cutting device which is capable of cutting while moving a casting maintained at a high temperature as possible, and which has a thermal cover.

Another object of the present invention is to provide a casting cutting device having a heat insulating cover which is simple in structure and easily used in existing continuous casting machines.

It is still another object of the present invention to provide a casting cutting device having an insulating cover which is easy to maintain and which is adjustable for various casting sizes.

In order to achieve the above objects, the casting cutting device according to the present invention is installed in the following horizontal transfer object of the roller feeder of the continuous casting machine, cutting the casting at the same time as the traveling speed of the carriage, covering and cutting the casting in the transfer object Insulation cover is installed to move along the conveyer along with the device.

This cutting device cuts the casting while moving with the moving casting. While the cutting is being performed, the moving thermal cover continues to cover the casting, preventing waste of heat from the casting. Castings cut to the desired length can be fed to a subsequent process such as rolling without reheating.

4 is a side view of an embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along the line VV of FIG. The frames, runners, clamp mechanisms and cutting torches (hereinafter collectively referred to as main bodies of the main parts including their items) in their drawings are similar to the corresponding parts of the conventional apparatus shown in FIGS. 2 and 3. . Therefore, they are numbered similarly and are not described in detail.

5 shows a fixed rear carriage 6c, but the cutting device according to the invention comprises a lifting roller stage 6b shown in FIG.

In Figs. 4 and 5, numerals 10a and 10b denote front and rear thermal insulation covers disposed at the front and rear sides of the frame 71 supporting the cutting device 7, respectively (front and back). The rear insulation covers 10a and 10b are sometimes referred to collectively as the insulation cover 10), and the insulation cover 10 of this embodiment has a cut surface having a channel shape, and a side plate 101 and an upper plate ( 102).

The side plate 101 supports the wheel 12 which moves on the rail 11 arrange | positioned on one side part of the conveyance roller 60 along the conveyance stand 6.

The side plate 101 and the top plate 102 assembled in the form of a channel form a closed space 100 to move the casting on the transfer table 60 supported on the wheel 12 on the transfer roller 60. Surrounding (4). The thermal cover 10 is fasteners 13 such as hooks, bolts and shackles, which are tightened to separate the front and rear ends of the frame 7 supporting the cutting device 7, respectively. 10 moves back and forth on the feed table 6 when the cutting device 7 moves. The insulating cover 10, which is tightened to be detachable from the frame 71, can change in accordance with the change in the size of the casting 4, and also facilitates the maintenance and inspection of the transfer table 6 and the auxiliary equipment.

The length of the insulating cover 10 is effective to surround the casting 4 moving on the feed table 6 while the cover 10 is inoperative as well as during the cutting of the cutting device 7. It is decided to guarantee. More precisely, the front heat insulating cover 10a has a length corresponding to the cutting length of the casting 4 or the gap between the tip of the casting 4 and the point where the clamp mechanism 73 acts, and the cutting device starts to transverse. It is made to include a length. The rear insulation cover 10b is made to have a length sufficient to secure the enclosed space 100 on the transfer table 6 behind the cutting device 7 moving forward from the last starting position to the point where the cutting is completed. .

In the embodiment shown in FIGS. 4 and 5, the length of the rear insulating cover 10b is minimized to reduce the resistance to its movement.

In order to ensure the above-mentioned function, the detachable fixed thermal insulation cover 14 is fixed on the rear conveying stand 6c so as not to disturb the movement of the cutting device 7. The rear insulation cover 10b covers the fixed cover 14.

When the cutting device 7 is in the rearmost starting position, the rear insulation cover 10b covers the entire length of the fixed cover 14 as shown in FIG.

Next, the rear insulation cover 10b is pulled forward by the cutting device 7 to be advanced. When the cutting device 7 reaches the outermost end to complete cutting, the trailing end of the cover 10b slightly overlaps or abuts the fixed cover 14. The fixing cover may be provided behind the cutting device 7 to assist the temperature of the cut casting.

In order to effectively preserve the temperature, the inside of the movable 10 and the fixed cover 14 is covered with a thermal insulating material. Considering the movement and exchange of the thermal covers, a lightweight, high-performance thermal insulator like ceramic fiber is preferable. For example, the cover is coated with ceramic fibers to a thickness of about 50 mm.

In this embodiment, the channel-shaped lower heat insulating cover 15 made of the side plate 151 and the bottom plate 152 is fixed to the transport table 6 under the transport roller 60. The lower cover 15 connected to the movable cover 10 and / or the fixed cover 14 surrounds the transfer roller 60. The bottom plate 152 may be opened and closed by the power cylinder 16. Thus, this embodiment can more effectively preserve the temperature of the casting 4. In addition, the scale falling from the moving casting 4 on the bottom plate 152 can be easily processed by operating the power cylinder 16 to open the bottom plate 152 as indicated by the dashed line in FIG. Can be. The scale falls by self-gravity through a hopper chute 17a into the scaled trench 17b.

6 shows a cross-sectional view of another embodiment of the thermal cover 10. The thermal cover 10 has a top plate 102 fixed to the side beam 18. Thus, the cover 10 is hung on the aspect ratio 18. Each end of the side beam 18 supports the wheel 19 moving on the rail 8 on which the runner 72 of the cutting device 7 moves. In this embodiment, the same rail 8 is used for the cutting device runner 72 and the side beam wheel 19. Thus, a large amount of space is provided in the vicinity of the transfer roller 60. This facility facilitates the maintenance and inspection of the transfer roller 60 and other devices.

In this embodiment, the cutting device 7 and the thermal cover 10 are moved forward by the moving casting 4 with the cutting device 7 clamped in the flame cutting operation. They are returned to the starting position by a drive 75 connected to the cutting device 7.

However, they can be advanced and returned by other means as far as flame cutting advances simultaneously with the running of the casting 4, and as long as reprocessing is achieved within a given time. For example, the cutting device 7 can be moved by adjusting the operation of the drive 75 to occur simultaneously with the measured moving speed of the casting 4 being cut.

FIG. 7 shows an embodiment of the type described above with a length measuring unit 93 determining the moving interval and a speed meter 91 measuring the moving speed of the casting 4 mounted on the trailing carriage 6C. Indicates. The speed meter 91 has a pinch roll 91 and a speedometer generator 91a. The length measuring unit 93 has a measuring roll. Without the clamp mechanism 73 the cutting device 7 is moved by the drive 75 independently of the casting 4.

The drive unit 75 is controlled by a signal transmitted from the speed meter 91 to the control unit 92 so that the cutting device 7 advances at the same speed as the casting 4. The thermal cover 10 fixed to the frame of the cutting device 7 moves with it. The signal from the length measuring unit 93 is supplied to the control unit 94 of the torch 74 to start cutting.

The thermal cover 10 does not always need to be moved by the cutting device 7 and can be self-propelled. Each cover then supports a respective drive, the operation of which takes place simultaneously with the speed of movement of the cutting device 7 or the casting 4.

FIG. 8 shows one embodiment of the type described above, wherein the cutting device 7 is driven in the same manner as in FIG. 7, but the thermal cover 10 is not fixed to the frame of the cutting device 7. The cover 10 is moved by a rack 95 installed thereon and a pinion 96 which engages with the rack 95 and is driven by a motor 97. The speed of the motor 97 is controlled by the control unit 98 supplied with a signal from the speed meter 91, so that the cover 10 advances at the same speed as the casting 4.

Upon removal of the clamp mechanism, the embodiments of FIGS. 7 and 8 do not require an opening through the clamp mechanism through the thermal cover. This eliminates heat loss from the openings and thus provides more effective thermal insulation.

9 shows another embodiment of the clamp mechanism provided in the cutting device 7. As in the embodiment of FIG. 5, the frame 71 of the cutting device 7 supports the wheel 76 moving on the rail 8. The air cylinder 737 is attached to the center of the frame 71, and the push head 738 is fixed to the distal end of the rod in the air cylinder 737.

The fixed thermal insulation cover 105 is attached to the stand 81 in close contact with each side of the casting 4 on the transfer roller 60. The flat and movable thermal insulation cover 103 is installed directly on the fixed cover 105 to form an airtight space 100 together with the fixed cover. Even if mounted on the frame 71 of the present embodiment, the movable cover 103 can be self-propelled by each drive unit as in the embodiment of FIG.

The push head 738 is vertically moved by the reciprocating action of the air cylinder 737 by the rod passing through the opening 104 of the movable cover 103.

Before the start of cutting, the pushhead 738 is lowered to gradually secure the casting 4 between itself and the transfer roller 60. Next, the rod of the air cylinder 737 extends to form a space between the wheel 76 and the rail 8. Thus, the frame 71 is placed on the casting 4 together with a cutting nozzle (not shown) or the like. As a result, the cutting device 7 moves forward with the casting 4 being cut.

When the casting 4 is cut, the pushhead 738 is drawn up and the cutting device 7 is lowered so that the wheel 76 and the rail 8 contact. The cutting device 7 is then returned by the drive (not shown) to its original position.

The movable cover 103 of this embodiment is small and light. Since the pushhead 738 only requires a small opening 104 to pass through, it receives less heat loss in this embodiment than in the clamp mechanism shown in FIG.

10 illustrates another embodiment of the present invention in which the sealed space 100 of the thermal cover 10 is heated by the auxiliary burner 99.

For example, an induction heating coil may be provided on the wall of the thermal cover 10. This heating only serves a secondary role in obtaining a uniform temperature distribution over the entire casting (4). Therefore, much heat supply is not necessary.

In the embodiment described above, a flame cutting torch is used to cut the casting. However, the apparatus of the present invention is not limited thereto.

For example, a Sawing Unit or laser cutter may be attached to a cutting head adapted to move across the casting. In addition, the shape of the thermal cover need not be limited to that used in the above-described embodiments. For example, a simple flat plate may be placed on a casting when the upstanding sidewalls can be uprighted on both sides thereof.

As will be apparent from the above description, the present invention provides the thermal insulation cover 10 to the cutting device 7 and moves the cover 10 and the cutting device 7 simultaneously with the running of the casting 4. Let's do it. Even at the time of cutting and fixing, the cover 10 surrounds the casting 4 so that effective heat retention can be maintained. This allows the cutting casting 4 prepared for delivery to a subsequent process to be kept at a significantly high temperature.

For example, the practice of the present invention shown in FIGS. 4 and 5 reduces the temperature drop of the casting 4 moving on the feed table 6 to 90-120 ° C. In another embodiment applied to a continuous casting machine provided with a thermal insulation device in the guide roller 5, the casting 4 passed through the feed table 6 was maintained at a high temperature of 1260-1320 ° C. The latter case showed the appropriate possibility of supplying the casting 4 supplied to a rolling process, or what is called direct charging rolling.

As formed by these embodiments, the present invention can be particularly effectively applied to curved cast continuous casting machines for direct charge rolling.

Claims (1)

A rail 71 for moving the frame 71 simultaneously with the moving speed of the casting 4 along the frame 71 and the transfer table 6 installed on the transfer roller 60 of the continuous casting machine on the transfer table ( 11) and the casting cutting device of the continuous casting machine composed of the cutting torch 74 supported by the frame 71 so as to move laterally on the casting 4, the front and rear thermal cover 10a. , Before and after the frame 71 so that 10b covers the casting 4 moving on the transfer table 6 and moves along the transfer table 6. Casting apparatus of a continuous casting machine, characterized in that for moving the insulating cover and the frame at the same time.

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