JPS63112054A - Carriage commonly used for inserting and disconnecting dummy bar and guiding ingot - Google Patents

Abstract

PURPOSE:To execute quick insertion and disconnection of a dummy bar and to shorten the time for prepn. of casting by providing a curved guide roll group for guiding the dummy bar, pinch rolls and an ingot guide curved in the direction opposite therefrom onto a carriage. CONSTITUTION:The carriage 16 commonly used for inserting and disconnecting the dummy bar and guiding the ingot is constituted by providing a group of the guide rolls 7 curved toward the carriage 16, the pinch rolls 5, 6 along the same and the ingot guide 18 curved in the direction from the curving direction of the guide rolls 7 onto the carriage 16 from the upper part thereof. The dummy bar is inserted by the carriage 16 into a casting mold constituted of a belt 1, etc., at the time of casting the thin ingot continuously by using the carriage 16. The dummy bar is pulled downward together with the ingot by means of the belt 1 and the pinch rolls 3 and is retreated onto the guide rolls 7 by the pinch rolls 5, 6 in the starting stage of casting. The dummy bar is disconnected when a dummy bar head arrives at the point A. The carriage 16 is moved in the direction of an arrow B and the ingot is drawn out to a leveling roll 9 side along the ingot guide 18.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to the insertion of a dummy bar in a continuous casting machine of the type that draws a slab directly below the mold and bends the slab with bending rolls, and This invention relates to a trolley having functions for separating and guiding slabs.

(Prior art and its problems) Conventionally, a continuous thin slab casting machine for producing thin slabs with a thickness of 50 nm or less from molten metal (hereinafter explained using molten steel as an example) uses a pair of rolls. Continuous casting machines that use a pair of belts and continuous casting machines that use a pair of belts are known. The insertion method of the dummy bar used when starting casting with these casting machines is the top charge method, in which the dummy bar is inserted from the top of the mold, similar to a regular continuous casting machine for slabs or billets, and the most commonly used casting method. There are two methods, a bottom charge method in which a dummy bar is inserted from the bottom of the mold through one guide roll, and these two methods are used.

However, in the top-charging method in which a dummy bar is inserted from the top of the mold, the thin slab cast by a continuous casting machine is wound into a coil shape, but the dummy bar and the thin slab must be separated before winding starts. There is a problem in that the device for circulating the dummy bar from which the slab is cut above the mold is seriously damaged. In addition, inserting a dummy bar with this method prevents the molten steel from oxidizing during casting.
There is a problem in that it is difficult to provide a means for shielding the molten steel surface from air between the tundish and the mold.

On the other hand, with the bottom charge method in which a dummy bar is inserted from the bottom of the mold through between the slab guide rolls, a dummy bar table must be installed behind the position where the thin slab is wound into a coil, especially in the case of a continuous thin slab casting machine. If the thin slab is not completely pulled out in the previous charge, the dummy bar cannot be returned and inserted into the mold, resulting in a very long casting preparation time. . Furthermore, between the position where the thin slab is wound into a coil and the thin slab continuous casting machine, a heat insulating box is installed to prevent heat radiation from the thin cast slab, and a dummy bar is attached to the roll inside the heat insulating box. There is a problem in that the dummy bar is heated and easily deformed because the dummy bar passes through the gap.

In addition, as another bottom charging method, as disclosed in Figures 12 and 33 on page 626 of Steel Handbook ■, a group of segments in the middle of the dummy bar segments are placed inside a curved guide roll. Try to bend it,
Although this is a method in which the dummy bar is housed in a dummy bar table, there are problems such as space constraints due to equipment and difficulty in ensuring the reliability of gap adjustment between the segments of the dummy bar.

The purpose of the present invention is to significantly reduce the casting preparation time from the completion of casting of the previous charge until the insertion of a dummy bar and the start of casting in continuous casting of slabs, continuous casting of plumes, and continuous casting of thin slabs. It's about doing. In particular, in the case of continuous casting of thin slabs, the amount by which the width of the product can be changed in the next rolling process is smaller in the case of thin slabs than in the case of slabs. Therefore, in continuous casting of thin slabs, the width of the thin slab must be changed arbitrarily, and even in the same charge, the flow of molten steel from the tundish must be stopped, and a dummy bar must be inserted into the mold within a few minutes. By opening the molten steel outflow gate again and reinjecting molten steel, it is possible to quickly insert a dummy bar, which can be applied when changing the width of a thin slab.

(Means for Solving the Problems) The present invention provides a group of guide rolls that are curved from the top of a truck toward the top of the truck, a pinch roll that is provided along the guide rolls, and a direction in which the guide rolls are curved. The above-mentioned problems have been solved and the above objectives have been achieved by providing a trolley that serves both for inserting and separating the dummy bar and for guiding the slab, which is characterized by having a slab guiding guide curved in the opposite direction. .

Hereinafter, one embodiment of the cart of the present invention will be described based on FIG.

A group of guide rolls 7 are provided on the truck 16 and are curved from above the truck 16 toward the top of the truck 16. In addition, a guide roll 7 provided on the trolley 16
A pair of pinch rolls 5 are provided along the group of guide rolls 7 at the tip of the guide rolls 7.
Pinch rolls 6 are also provided at other locations in the group. Further, on the carriage 16, a slab guide 18 is provided which is curved in the opposite direction to the curving direction of the group of guide rolls 7 provided in a curved manner, and the carriage 16 is driven by a known driving means. It is possible to move in the direction of the arrow.

The above-mentioned truck is applied, for example, to a continuous thin slab casting machine having the configuration shown in FIG.

In the continuous thin slab casting machine shown in Fig. 2, molten steel is injected into a mold consisting of a belt 1 and a short side mold (not shown), and the solidified slab is pulled out by pinch rolls 3 installed directly below the mold. The drawn slab is bent to a constant curvature by a bending roll 4 provided directly below the pinch roll 3, the slab bent to a constant curvature is straightened by a straightening roll 9, and the slab is bent by a pinch roll 10. Pull out the slab 1
The slab 11 that has passed through a heat insulating box 17 provided to prevent the bending roll 1 from cooling
3 and cradle rolls 14, and when the slab reaches a predetermined length, the slab 11 is sheared by a shearing machine 12.

In the above configuration, the dummy bar set in the mold at the start of casting is pulled out together with the slab by the belt 1 and the pinch roll 3, and is moved to the position shown by the solid line in FIG. The trolley 16 is placed in a position where the dummy bar is pulled out by the rolls 5 and pinch rolls 6.
is arranged, the dummy bar is retracted onto the guide roll 7 on the trolley 16, and the dummy bar head part and the slab 11
When the joint reaches point A shown in the figure, the cart is moved in the direction B and stopped at the position shown by the dashed line. At this time, the dummy bar head part is completely separated from the slab 11, and the slab is bent to a certain curvature by the bending rolls 4, and the slab guide 18, which is curved to the right in the figure, is provided on the trolley. It passes through the top, is straightened by straightening rolls 9, and pulled out by pinch rolls 10. Meanwhile, the dummy bar head on the trolley 16 is replaced to prepare for the next casting.

When the casting is completed and the head of the slab has passed the straightening roll 9, the cart 16 is moved in the direction C shown in FIG. The dummy bar is returned upward by the pinch rolls 5 and 6 provided above, and the dummy bar head is set at a predetermined position in the mold by the pinch roll 3, and the next casting is started.

When separating the dummy bar head and slab as described above, the shape of the dummy bar seen from the moving direction of the truck is shown in Figure 3a. There is no problem when separating it from the slab.

The example described above is a case where the cart of the present invention is applied to a continuous thin slab casting machine, but there are also continuous slab casting machines with pinch rolls and bending rolls installed directly under the mold, continuous bloom casting machines, etc. The trolley of the present invention can also be applied to machines etc.

(Example) A cart having the structure shown in FIG. 1 was used in the belt type continuous thin slab casting machine shown in FIG. 2.

After the injection of molten steel from a tundish (not shown) was completed, it took about 18 seconds for the head of the thin slab to pass through the straightening rolls 9. Immediately after the head of the thin slab passed the straightening roll 9, it took 5 seconds to move the cart in the C direction. next,
It took about 27 seconds to reversely transport the dummy bar using the pinch rolls 5 and 6 provided on the truck and the pinch roll 3 provided directly below the belt, and to set it at a predetermined position in the mold. After this, it took about 10 seconds to seal between the dummy bar head and the mold with the sealing material.

The casting preparation time from the completion of the previous casting to the start of the next casting was approximately 60 seconds.

(Effects of the Invention) As explained above, according to the present invention, the casting preparation time for continuous casting of thin slabs, etc. is significantly shortened, and the width of the slab can be reduced within the same charge in continuous casting of thin slabs. Even when making changes, the dummy bar can be quickly inserted.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a cart according to the present invention and a state in which the cart according to the present invention is arranged at the lower part of a belt-type continuous thin slab casting machine. FIG. 2 is a diagram showing the entire belt-type thin slab continuous casting machine. FIG. 3a is a front view of the dummy bar, and FIG. 3b is an AA view of FIG. 3a. 1... Belt 2... Molten steel 3.5, 6.
10... Pinch roll 4... Bending roll 7... Guide roll 8.
... Dummy bar 9 ... Straightening roll 11 ...
Thin slab 12... Shearing machine 13... Bending roll 14... Cradle roll 15... Coil I6.
・・Truck 17・Heat box 18・
... Slab Guide Patent Applicant: Kawasaki Steel Co., Ltd. Applicant: Hitachi, Ltd. Figure 2, Figure 3a, Figure 3b, Figure 8-

Claims (1)

[Claims] 1. A group of guide rolls curved from the top of the truck toward the top of the truck, a pinch roll provided along the guide rolls, and a slate guiding guide curved in the opposite direction to the curved direction of the guide rolls. A trolley that doubles as dummy bar insertion/cutting and slab guidance.