JPH078416B2 - Single belt type continuous casting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention cools and solidifies a molten metal (molten metal) on an endless belt that is inclined and travels.
The present invention relates to a single belt type continuous casting machine (hereinafter referred to as a continuous casting machine) that continuously casts a thin plate.

[Conventional technology]

In recent years, molten metal such as molten steel is close to the final shape of several mm to several tens.
Attention has been focused on a continuous casting method in which a thin plate having a thickness of about mm is directly continuously cast. In the case of this method, it is not necessary to carry out a multi-step process such as rolling as in the conventional case, and therefore the process and equipment can be simplified. In addition, according to this method, the number of times the material is heated during each step is reduced, which is also effective in terms of energy saving.

One of the continuous casting machines that achieves this continuous casting method is, for example, the single-belt type continuous casting machine disclosed in JP-A-62-97750.

This single belt type continuous casting machine is, for example, as shown in FIG.
A metal belt 72 is stretched around a pair of pulleys 73 and 74 so as to travel on an endless track. The belt 72 is slanted so that the casting direction rises, and the fixed weir 75 (also called the rear weir) is mounted on the belt 72.
And a set of size weirs 76 and 77 are provided with a hot water pool portion 78, the molten metal 79 is poured into the hot water pool portion 78, and the molten metal 79 is cooled by a cooling device 80 arranged below the belt. By cooling and solidifying, one pulley 74 is used to
81 is continuously cast.

[Problems to be Solved by the Invention]

By the way, in the single-belt continuous casting machine having the above-described structure, the width of the thin plate 81 to be cast is substantially equal to the distance between the two side dams 76 and 77 that define the basin 78. Therefore, when trying to change the width of a thin plate cast in this continuous casting machine, the fixed weir 75 up to that point must be changed to a fixed weir having a width dimension corresponding to the intended thin plate width. No
In addition, the size weir distance must be changed. Therefore, this width change requires time and cost.

In addition, as shown in FIG. 8, in the continuous casting machine of the type in which the side pools are formed by the side weirs placed on the belt, as shown in FIG. 77a
A solidified shell of the molten metal 79 is easily generated on the upper part, and projections 82 are formed on the edges of the thin plate to be cast, which deteriorates the quality of the thin plate shape.

In view of the above problems, it is an object of the present invention to provide a single-belt continuous casting machine that can easily change the width of a thin plate to be cast and that can cast a thin plate that does not form a protrusion on its edge. It is a thing.

[Means for Solving the Problems]

According to the present invention to solve the above-mentioned object, a fixed dam is placed on an endless belt that is inclined and runs so that the casting direction rises, and a molten metal pool is formed downstream of the fixed weir in the casting direction. Then, in a single-belt continuous casting machine for continuously casting a thin metal plate by cooling and solidifying the molten metal poured into the molten metal pool, the lower end surface of the fixed dam slidingly contacting the endless belt is cast. A belt deforming means is provided which is curved in a convex shape when viewed from the direction, and at least a portion of the endless belt which forms the hot water pool portion is curved in a concave shape to complement the shape of the fixed dam lower end surface. A single belt type continuous casting machine is provided.

[Work]

The bottom surface of the basin is curved in an arc shape due to the convex curved formation of the lower end surface of the fixed dam and the concave curved deformation of the basin portion of the endless belt. As a result, the molten metal is held in this pool even without the side dam, and the width of the thin plate can be changed by changing the amount of molten metal held in the pool.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration of a single-belt type continuous casting machine 1 according to the present invention. A metal endless belt (hereinafter referred to as a belt) 2 is wound around a pair of pulleys 3 and 4. ing.

One pulley 4 is held at a position higher than the pulley 3, and these pulleys 3 and 4 are rotationally driven in a direction indicated by an arrow in the figure by a drive mechanism (not shown) such as a motor. Therefore, the upper half of the belt 2 rises while inclining toward the pulley 4 in the high position, as indicated by the arrow a. In the figure, the arrow a corresponds to the casting direction of the continuous casting machine 1.

A fixed dam 5 is placed on the moving belt 2 by a supporting mechanism (not shown). A molten metal pool 8 for storing the molten metal 7 from the pouring device 6 arranged above the belt 2 is formed downstream of the fixed weir 5 in the casting direction a.

A cooling device 10 is provided on the back side of the belt 2 portion forming the pool 8 for removing the poured molten metal 7 to generate a solidified shell 9 on the surface of the belt 2.

The formed solidified shell 9 is conveyed while growing as the belt 2 moves, and finally separated from the belt 2 at the pulley 4 to become a thin plate 11 and is carried out from the continuous casting machine 1. .

The features of the continuous casting machine 1 according to the present invention will be described below with reference to FIG. 2 showing a cross section taken along line II-II in FIG.

As is apparent from this figure, according to the present invention, the lower end surface 5a of the above-mentioned fixed dam 5 which is in sliding contact with the belt 2 is formed so as to be convexly curved toward the belt 2.

Further, according to the present embodiment, as typified by FIG. 3, the belt 2 is sandwiched between the upper and lower sides of the fixed dam 5 in the casting direction, and the flat belt 2 is gradually deformed. Finally, as shown in FIG. 2, rolls 12 and 13 for bending the belt itself into a concave shape are provided so that the belt 2 comes into contact with the lower end surface 5a of the fixed weir without a gap.

In addition to this, according to this embodiment, as is clear from FIGS. 1 and 2, even in the basin portion 8 located downstream of the fixed weir 5 in the casting direction, it complements the fixed weir lower end surface 5a. The belt 14 that bends the belt 2 concavely
It is provided on the back side of.

By thus bending the portion of the belt 2 forming the pool 8 along the fixed weir lower end surface 5a, the molten metal 7 can be formed on the belt 2 without a side dam partitioning the side surface of the pool 8.
As a result, the lateral outflow is suppressed, and as shown in FIG. 2, the solidified shell 9 is formed at the bottom of the pool 8 in a concave shape following the arc-shaped curvature of the bottom surface of the pool.

In the present embodiment, as described above, the solidification shell 9
Since the thin plate 11 carried out from the pulley 4 is also curved with the bending of the pulley 4, as shown in FIG. 1, the straightening roll that straightens the curvature of the thin plate 11 to the downstream side of the pulley 4 to flatten it.
15 are provided. Fig. 4 shows a cross section of thin plate 11 before straightening,
FIG. 5 shows a cross section of the thin plate 11 after being straightened by the roll 15.

As described above, since the molten metal pool portion 8 of the continuous casting machine 1 according to the present embodiment is formed by the belt 2 that is curved in a concave shape when viewed from the casting direction, it is possible to eliminate the conventional side dam. Therefore, there is no formation of protrusions at the edge of the thin plate due to the installation of the side dam, as seen in the conventional continuous casting machine.

Further, in this embodiment, the width W of the cast thin plate 11 is determined in accordance with the depth D of the molten metal 7 in the pool 8 as shown in FIG. On the other hand, it can be easily dealt with by simply controlling the amount of molten metal discharged from the pouring device 6 (Fig. 1) and adjusting the molten metal depth D, and it is not necessary to replace the fixed weir.

In addition, in the embodiment described above, the shape of the fixed weir only refers to the lower end surface thereof, but if the belt is greatly curved in the pool, the pool formed will be seen from above the continuous casting machine. As shown in FIG. 6, the boundary line 8a of the basin 8 on the downstream side in the casting direction tends to be largely curved. Therefore, in such a case, the fixed weir 5 is formed so that the outer peripheral surface 5b of the fixed weir 5 in contact with the basin 8 is curved so as to approximate the boundary line 8a, and the solidified shell growth distance L is
It is preferable to reduce variations in thickness of the thin plate to be cast so that the thin plate width W becomes substantially equal in the W direction.

In addition, although the roll is used as the means for deforming the belt in the above-mentioned embodiment, the present invention is not limited to this, and although not shown, for example, a guide having a curved opening is disposed close to the fixed dam. Alternatively, the belt may be deformed by passing it through this opening, or both ends of the belt may be displaced by suitable actuators.

〔The invention's effect〕

As described above, according to the present invention, it is possible to easily change the width of a cast thin plate simply by changing the molten metal depth of the molten metal pool without changing the fixed weir, and it is possible to change the width in an extremely short time and at low cost. Is. In addition, since the continuous casting machine of the present invention basically does not need a side weir, the structure of the continuous casting machine itself is simple, and the projection formation of the thin plate edge portion accompanying the installation of the side weir, which has been conventionally seen, is formed. And the quality of the thin plate shape is improved.

[Brief description of drawings]

FIG. 1 is a side sectional view of a continuous casting machine showing a schematic structure of a single belt type continuous casting machine according to the present invention; FIG. 2 is a sectional view of the continuous casting machine taken along the line II-II in FIG. 1; 1 is a sectional view of the continuous casting machine taken along line III-III in FIG. 1; FIG. 4 is a sectional view of a thin plate taken along line IV-IV in FIG. 1; FIG. 5 is a thin plate taken along line VV in FIG. Cross section;
FIG. 6 is a top view of a continuous casting machine showing a modified example of the fixed weir; FIG. 7 is a schematic configuration diagram showing a conventional single belt type continuous casting machine;
The figure is a cross-sectional view of the basin when the thin plate width is changed in the conventional continuous casting machine shown in FIG. 1 …… single belt type continuous casting machine, 2 …… endless belt, 5 …… fixed weir, 5a …… lower end surface of fixed weir, 7 …… molten metal, 8 …… melting pool part, 11 …… thin plate, 12,13, 14 …… Roll.

Claims (1)

[Claims] 1. A fixed weir is placed on an endless belt that is inclined and runs so that the casting direction rises, and a molten metal pool is formed on the downstream side of the fixed weir in the casting direction. In a single-belt continuous casting machine that continuously casts a thin metal plate by cooling and solidifying the poured molten metal, the lower end surface of the fixed dam slidingly contacting the endless belt is convex when viewed from the casting direction. A single-belt continuous belt, characterized in that it is provided with belt deforming means for forming a curved shape and at least a portion of the endless belt forming the molten metal pool portion to be curved in a concave shape complementary to the shape of the lower surface of the fixed dam. Casting machine.