JPH0199749A - Continuous casting machine - Google Patents

Abstract

PURPOSE:To fix the pushing force, to execute stable casting and to improve the yield by shifting one pair of side plates held to rotating body toward casting width direction at the time of continuously casting a cast slab. CONSTITUTION:The one pair of side plates 2 held to the rotating body 1 in continuous casting apparatus for cast slab is constituted as shiftable toward casting width direction. As the time of casting, the side plates are shifted by energizing means 15, 16 to push the cast slab from the side faces. Then, the pushing force is controlled so as to become the fixed value. In such constitution, breakage of solidified shell is prevented and the stable casting is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a continuous casting machine using a synchronous rotary mold, and particularly to a continuous casting machine having a side plate mold suitable for improving the quality of short sides of slabs.

[Conventional technology]

Continuous casting machines for producing thin slabs using a pair of belt molds include, for example, a vertical type machine described in Japanese Utility Model Application Publication No. 60-561/15, and a vertical type machine described in Japanese Patent Application Publication No. 58-218349. A narrowing down type is known.

In these continuous casting machines, the side plates for cooling and shaping the short sides of the slab were fixedly arranged.

(Problems to be Solved by the Invention) According to the above-mentioned conventional twin-belt continuous casting machine, the side plate that forms the shell on the short side of the slab is fixed, so this side plate does not move the shell downward. The shell formed by this side plate is moved downward by the force of connection with the shell on the long side of the slab formed by the surface of the belt.

However, since the length of the long side of the slab, that is, the width of the slab, is as large as 600 to 1,600 m+, it shrinks as it progresses below the mold and cools, and as a result, the shell on the short side of the slab separates from the side plate below the side plate. do. To prevent this phenomenon, the side plates are usually tilted toward the casting side below the mold, and the distance between the pair of side plates is tapered so that the distance between them is narrower on the lower side than on the upper side of the mold. Carry out casting.

On the other hand, twin belt continuous casting machines generally have 20 to 50 I1
It takes 10 to 15 hours to produce slabs with a thickness of about 1 ml.
It is carried out at a speed of m/win, and the start-up speed of casting is 5 m/1 tin. That is! The speed of the 5th generation is rapidly accelerated from the low speed range to the high speed range. Also, depending on the casting conditions, it may be necessary to change the casting speed.
The amount of taper between the side plates mentioned above is generally set large in consideration of plate width contraction at low speeds.

Particularly in the case of the draw casting method as described in JP-A No. 58-218349, one part of the side plate is made of refractory material so that the lower part of the side plate can be cooled without forming a shell in the upper part. is made of metal, and the short side of the slab is shaped using this dowel, so the width of the slab is ensured at the connection between the refractory and the short side of the metal at the bottom. Otherwise, a gap will occur between the metal side plate and the long side end of the slab. As a result, there is a problem in that the molten metal intrudes into the gap, causing the short side of the slab to become a single layer, or in the worst case, the molten metal leaks to the outside. In order to solve this problem, the amount of taper between the side plates described above is set large so as to always press the long side shells.

However, if the taper fit between the side plates is increased in this way, the slab will be subjected to compression plastic working using the side plates, and a large force will be generated on the slab surface formed by the side plates and on the side plate itself. Therefore, as shown in FIG.
The resistance between the side plate surface of the slab shell 4 increases,
There was a problem that fractures 5 occurred in the slab shell 4.

SUMMARY OF THE INVENTION An object of the present invention is to provide a continuous casting machine that solves the above-mentioned problems, prevents breakage of the slab shell, and enables stable casting.

[Means for solving problems]

In order to achieve the above object, the present invention uses a pair of periodic rotating bodies for cooling and shaping the long sides of a plate-shaped slab, and a pair of side plates sandwiched between the rotating bodies and facing each other to form a mold. In a continuous casting machine that manufactures plate-shaped slabs by continuously supplying molten metal to the mold, the side plates are movable in the casting width direction, and the pressing force of the slabs by the side plates is regulated. It is constructed by providing a biasing means.

[Effect]

According to the above configuration, since the side plate is pressed against the slab shell by the biasing means, the force acting between the slab shell and the side plate can be kept constant, and the resistance generated between the slab and the side plate can be suppressed. By keeping the breaking force below that of the slab shell,
Breaking of the shell can be prevented.

〔Example〕

Hereinafter, one embodiment of a continuous casting machine according to the present invention will be described with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1 to 4.

A twin-belt continuous casting machine is generally constructed as shown in FIG. In the figure, parts that are the same as or equivalent to those shown in FIG. 9 are designated by the same reference numerals. The mold is supported by two pairs of rolls 6.7 and rotates continuously in the six directions of arrows 1.
It is composed of a pair of belts 1 and a side plate 2 sandwiched between these belts 1 and provided facing each other. A molten metal 3 is poured into this mold from a nozzle 9 of a dumpling 8, the molten metal 3 is cooled by the mold, a shell 4 is formed, and a plate-shaped slab 1o is manufactured. Cooling pads 11 are provided on the back of each belt 1, and high-pressure water is supplied from these cooling pads 11 between the cooling pads 11 and the belt 1 to cool the belt 1 and remove the molten metal added to the belt 1. It supports a static pressure load of 3.

1 and 2 show the mounting structure of the side plate 2, which is a feature of this embodiment. Since the mounting structure of these side plates 2 is symmetrical, one side will be explained. The side plate 2 is connected to the position setting plate 1 via two bolts 12° 13 installed in the side plate 2.
4 so as to be movable in the axial direction of bolts 12 and 13, and the heads of these bolts 1-12 and 13 prevent the side plate 2 from coming off the position setting plate 14. Also, a pair of springs 15 and 16 are installed between the position setting plate 14 and the side plate 2, so that the side plate 2 can be pressed in the direction of the slab 4 to follow changes in the width of the slab. There is.

The rigidity of the upper spring 15 is selected to be stronger than that of the lower spring 16. One ends of two screws 17, 18 are fixed to the position setting plate 14, and the other ends of these screws 17, 18 are enclosed in a casing 19 fixed to the main body of the apparatus.

Further, the screws 17 and 18 are respectively screwed into inner diameter threads at the center of the worm wheel 20 which is rotatably supported within the casing 19.
0.21 are meshed with worms 22 and 23, respectively. By rotating the worms 22 and 23, the screws 1
7.18 in the axial direction to move the position setting plate 14. Further, the surface of the side plate 2 that comes into contact with the slab 4 is formed into a smooth quadratic curve shape, as shown in the graph of the relationship between the dimensions in the length direction a and the width direction W in FIG.

Furthermore, as shown in FIG. 2, the side plate 2 is supported in a floating state between a pair of butts 11 provided oppositely, and the pressing force from the belt 1 on both sides of the side plate 2 is equal. There is. And header 24 in pad 11
The high-pressure cooling water supplied from the
The belt 1 is pressed against the side plate 2 by the pressure of this cooling water.

The operation of this embodiment configured as described above will be explained below. In FIG. 1, the shell 4 formed by the belt 1 gradually shrinks in width from Wl to Wl as it descends from the hot water level 26. This shrinkage amount ΔW”Wt Wl is
If the area in which the shell 4 is in contact with is 500I1wl, it is about several + ma, but this contraction amount ΔW changes depending on the U speed. For example, if the casting speed is 5 m/n resistance, ΔW = 4 m, and if the casting speed is 10 m/+++ in, ΔW =
It will be about 211111. Moreover, as shown in FIG. 4, when the width of the plate width ΔW is taken from the side plate length Q from the hot water level 26 on the horizontal axis, the shrinkage width change is large in the vicinity of the hot water level 26,
As the position of is further away from the hot water level 26, the decrease becomes more gradual.

Experiments have revealed that this is because the thickness of the shell 4 formed on the surface of the belt 1 is proportional to the side plate length Q to the 172nd power. That is, the contraction width changes in a quadratic curve with respect to the side plate length α. However, since the absolute amount of this shrinkage width changes depending on the casting speed as described above, it is desirable to adjust ΔW to a steady speed.

In FIG. 1, the side plate 2 has two springs 15, 16
The shell is pressed against the slab by the upper spring, but since the position suppressed by the upper spring is the initial shell position, the rigidity is increased and it is fixedly set. Also, the lower spring 16
The rigidity is weakened so that it can follow the shrinkage changes of the slab shell.

On the other hand, the movement of the positioning plate 14 by the screws 17, 18 is normally used to set the width of the slab before the start of casting.

By separately providing the side plate 2 and the position setting plate 14 in this manner, it is also possible to improve the ability of the outer plate 2 to follow shrinkage in slab width. It is also possible to measure the width of the slab produced during casting and move the position setting plate 14 based on this measurement value to correct errors in the width of the slab. In addition, if the supply water pressure of the cooling water supplied from the spatula 24 in the pad 11 is kept constant, the pressing force between the belt 1 and the side plate 2 can be kept constant. The resistance to movement is constant. This causes spring 15.
16 becomes easy to design.

According to this embodiment, by pressing the side plate 2, which together with the belt 1 constitutes the mold, against the shaped slab shell 4 side by the springs 15 and 16, the following effects can be obtained.

1. The side plate 2 moves following the amount of shrinkage of the slab shell 4 regardless of the change in casting speed, and presses the slab shell 4 with an almost constant force, causing a break in the slab shell 4. Stable casting is possible without any problems.

2. Spring 1 that biases the side plate 2 against the slab shell 4
By increasing the rigidity of the upper spring 15 of 5.16, the shell formation phenomenon during the initial formation of the slab shell 4 can be performed stably.

3. By making the curve on the side of the side plate 2 in contact with the slab surface a smooth quadratic curve, and making the curvature of the upper part of this curve large and the curvature of the lower part small, the actual shrinkage width of the slab can be changed. The side plate 2 having the same curvature change can be formed, and stable casting becomes possible.

4. By arranging the springs 15 and 16 between the side plate 2 that contacts the one-piece shell 4 and the position adjustment plate 14, it is possible to reduce the weight of the members that follow the slab width contraction. , it is possible to improve the ability of the side plate 2 to follow the width shrinkage of the slab.

In the above embodiment, two springs 15 and 16 are provided between the side plate 2 and the position adjustment plate 14, but as shown in FIG. The bolts 12 may be removed and the upper part of the side plate 2 may be rotatably connected to the bracket 27 fixed to the position adjustment plate 14 via the pin 28. In this case, the side plate 2 is connected to the slab shell 4 by the spring 16 with the pin 28 as the center.
Rotation to the side is suppressed.

FIGS. 6 and 7 show an example in which the present invention is applied to a narrowing type continuous SR machine. In FIG. 6, a fan-shaped side plate 29 is arranged between two belts 1 to form a mold. The upper part of this side plate 29 is framed by a metal frame 30, and a refractory material 31 is provided inside, so that no shell is generated in this upper part due to cooling of the molten metal. A cooling metal 32 is formed at the lower part of the side plate 29, and this part cools the entire short side area of the slab to form a shell. Further, in FIG. 7 showing the cross section taken along the line A-A in FIG. 6, the side plate 29 is connected to the spring 15.
The long side 33 of the cast side is pressed.

In the squeezing type, no shell is generated due to the presence of the refractory 31, so this portion is in contact with the molten metal 3. This embodiment can also have the same functions and effects as the embodiment shown in FIG.

Although the above-mentioned embodiments have been described with respect to a twin-belt continuous casting machine, the present invention can also be applied to a twin-drum continuous casting machine such as that disclosed in Japanese Patent Application Laid-Open No. 59-153553 mentioned above. In this case, as shown in FIG. 8, the long sides of the slab are cooled and shaped by two drums 34. Further, the side plate 35 has a structure similar to that of the side plate 29 shown in FIGS. 6 and 7, and the part that comes into contact with the drum 34 is a metal frame 36, and the inside has a fireproof structure to prevent the molten metal from cooling. Even in the embodiment in which the object 37 is provided, the same functions and effects as in the embodiment shown in FIG. 1 can be obtained.

As mentioned above, in the present invention, the long side of the slab is a rotating mold,
In other words, a pair of rotary molds that move in synchronization with the shell that is cooled and shaped by this mold, and a mold that is composed of side plates facing each other between the synchronously rotating molds for forming the short sides of the slab. A casting apparatus that continuously casts molten metal using a casting machine can be applied to all types of continuous casting machines, and the above-mentioned effects can be obtained.

In each of the above embodiments, the springs 15 and 16 are used as a means for urging the side plates 2 and 17 to press the slab, but the means for obtaining this pressing force may be an air cylinder using fluid or hydraulic pressure. A cylinder may be used, and by any means, the side plates 2, 1 are attached to the slab.
7's repressive power can be regulated.

[Effects of the Invention] As described above, according to the present invention, a pair of synchronous rotating bodies for cooling and shaping the long sides of a slab, and a pair of side plates sandwiched between these rotating bodies and provided facing each other are provided. The side plate of the continuous casting machine, which constitutes the mold, is made movable in the cast width direction, and the biasing means applies a substantially constant pressing force to the slab, thereby preventing the cast side shell from breaking. Stable casting can be performed without any problems.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view showing an embodiment of a continuous casting machine according to the present invention, Fig. 2 is a cross-sectional view of Fig. 1, and Fig. 3 is a twin-belt continuous casting machine to which this embodiment is applied. FIG. 4 is a graph showing the width shrinkage state of the slab in the mold, FIG. 5 is a front view of main parts showing another embodiment of the present invention, and FIG.
The figure is a side view showing an embodiment in which the present invention is applied to a narrow-type twin bell 1 continuous casting machine, and FIG. 7 is a sectional view taken along line A-A in FIG. 6.
FIG. 8 is a side view of the essential parts of a twin drum continuous casting machine to which the present invention is applied, and FIG. 9 is an explanatory diagram of the state of fracture of the slab. 2.17... Side plate, 3... Molten metal, 10... Platy slab, daughter 10 67 section zS... No. 30th fθ... Non-reflective sheet toughness 7? Young 4-Loki S mouth-21・C'4 1') r-1ri

Claims (1)

[Claims] 1. A mold is formed by a pair of periodic rotating bodies that cool and shape the long sides of a plate-shaped cast piece, and a pair of side plates sandwiched between the rotating bodies and provided facing each other. In a continuous casting machine that manufactures plate-shaped slabs by continuously supplying molten metal to the mold, the side plates are movable in the casting width direction, and the pressing force of the side plates on the slabs is regulated. A continuous casting machine characterized by being provided with a biasing means. 2. The continuous casting machine according to claim 1, wherein the biasing means is a spring provided between a side plate and a position setting plate that presets the width of the slab. 3. At least one spring is provided on each of the upper and lower parts of the side plate, and the rigidity of the upper spring is greater than that of the lower spring. Continuous casting machine. 4. The series of claims 1 or 2, characterized in that at least one spring is provided at the lower part of the side plate, and the upper part of the side plate is rotatably supported by a position setting plate. Casting machine.