JPS6018254A - Continuous casting device for thin plate - Google Patents

Abstract

PURPOSE:To pull up continuously a billet having a uniform thickness without sticking in pulling up type continuous casting of a thin plate by using a rotary casting mold by allowing molten slag to flow out of a non-cooled stationary casting mold which contacts the outside circumference in the projecting part at both ends of a rotary cooled casting mold. CONSTITUTION:The molten metal 2 introduced through a pouring spout 7 is removed of surface slag by a gage 6 and is cooled and solidified in the intermediate cylindrical part 3a between both edges 3b of a water-cooled rotary casting mold 3, then the molten metal is pulled up in the form of a billet 1. The wall thickness of the pulled up billet 8 is made uniform by a non-cooled stationary casting mold 8 which contacts the outside circumference at both edges 3b. The sticking of the billet 1 to the mold 8 is prevented by the outflow of molten slag 9 from a passage 8b to the mold surface 8c. The shaft part 3d of the mold 3 is supported by a shaft retaining spring to prevent the generation of excessive sliding resistance force with the mold 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technology 61 of the present invention] The present invention relates to continuous casting of thin plates of glass, plastics, metals, etc.

[MoY's thin plate continuous casting equipment]

Figure 1 is a plan view of a four-cut L1 thin plate continuous casting system, and Figure 2 is a cross-sectional view taken along line 1-1 in Figure 1. , Cylindrical part 3 of rotary mold B
At the bottom of a, the molten metal 2VCa m in the sump 5 is swollen 7, and the shafts 3c and 3d of the rotary mold 3 are supported by bearings 4, and the shaft 3d of the rotary mold 6 is driven. The field is connected to the device. There is a hollow part 3 inside the shafts 3c and 3d.
A cooling device f (not shown) is disposed inside the cylindrical portion 3a, and working water is supplied to and discharged from the cooling device f through the hollow portion 3e. Molten metal is poured into the sump 5 using a pouring gutter 7, and a ladle is disposed behind the pouring gutter 7. A weir 67'l is provided inside the bath 5, and this weir 60''i is supported by both side walls of the bath 5.

There is a gap on one side of weir 6.

Two pieces of molten metal flowing from the pouring gutter 7 pass through the lower part of the weir and reach the periphery of the rotary mold cylindrical part 3a.

Since the rotary mold cylindrical part 3a has an interior water-cooled f', the heat of the molten metal 2 is taken from its outer periphery and the molten metal adhering to the cylinder ↑-B 3a is solidified.

Since the rotary mold 3 is rotated in the direction of 3f by the driving device, the thickness of the slab 1 produced in the cylindrical part 3aT: is 3f.
The thickness gradually increases by 1° in the direction of the slab 1 around the rotary mold 30.
When it reaches the surface of the molten metal 2 in the sump 5, it stops growing. At this point, the slab is peeled off from the rotary mold 3 and pulled upward by the pinch rolls 8a and 8b.

Since the end portion 3b of the rotary mold 3 is made of a heat insulating material, the cooling effect on the cylindrical portion 3a does not extend to this extent. Therefore, no slab is generated around the end portion 31).

The speeds of the rotary mold 3 and the pinch rolls 8a, 8b are synchronized.

[Disadvantages of the above conventional device]

The above-mentioned conventional equipment W has the disadvantage that it is difficult to maintain a constant thickness of the product (slab). That is, in order to keep the plate thickness constant, it is necessary to accurately control the casting conditions, ie, the temperature of the molten metal, the rotation speed of the mold for one rotation, and the cooling conditions, which is extremely difficult.

[Object of the present invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a drawing-type continuous thin plate casting apparatus that eliminates the drawbacks of the conventional apparatus described above. That is, an object of the present invention is to provide a drawing-type continuous thin plate casting apparatus in which the thickness of a product (slab) does not easily fluctuate.

[Configuration of the present invention]

The present invention achieves the above object by disposing a fixed mold around a water-cooled rotary mold to form a mold space, and providing a molten slag outflow opening on the mold surface of the fixed mold. . That is, the present invention provides a pull-up continuous thin plate casting apparatus using a rotary mold with protrusions located south of both grades, in which a fixed mold is brought into contact with the outer periphery of the protrusions on both edges of the rotary mold to form a mold space, and an identified mold is This is a pull-up continuous thin plate casting apparatus characterized by having a molten slag outflow opening provided on the mold surface.

In the present invention, the rotary mold is cylindrical, and both edges of the cylindrical part protrude at a constant height over the entire circumference, and are rotatably supported on the cylindrical shaft. ing. The inside of this rotary mold is configured to be cooled, and this rotary mold has the same structure as the rotary mold of the conventional thin plate continuous casting apparatus described above. In the present invention, a fixed mold is brought into contact with the outer periphery of the protrusions on both sides of the rotary mold. The curvature of the partial cylindrical concave surface is the same as the curvature of the outer peripheral curved surface of the protrusion on both edges of the rotary mold.

In the present invention, the fixed mold has a partially cylindrical concave surface.

The mold space is defined as the space surrounded by the four sides of the protruding parts (two sides) on both edges of the cylindrical part of the rotary mold. An opening is provided to supply molten slag to the interface between the fixed mold and the slab. This is because in continuous plate casting equipment that uses fixed molds, problems tend to occur due to sticking of slabs to the fixed mold or generation of excessive sliding resistance, so this problem can be prevented.
It's rice. Furthermore, in the present invention, especially when casting a material with a high solidification point, it is preferable to include a means for heating the stationary mold itself, such as a heating element or a heating rod.

In addition, in the present invention, a shaft holding spring is provided that biases the shaft holding ring of the rotating mold toward the fixed mold, but this is due to excessive sliding resistance between the rotating mold and the fixed mold. This is to prevent troubles caused by force generation. In addition, in the present invention, the above-mentioned troubles do not occur because the arrangement of the shaft spring and the above-mentioned image configuration in which the molten slag outflow opening is provided on the mold surface of the fixed mold are combined. It can be operated safely even when casting reeds, especially materials with high freezing points. Therefore, it is necessary to manufacture slabs of material with a high freezing point [4
'! It is suitable for i.

Although the present invention has been described in detail above, the present invention will be explained in more detail based on FIGS. 3 to 5. FIG. 3 is a plan view of a thin plate continuous casting apparatus which is an embodiment of the present invention, and FIG.
FIG. 5 is a sectional view taken along the line of FIG. 3, and FIG. 5 is a side view of FIG. 5 and 5, the rotary mold 3, the molten metal sump 5, etc. have the same construction as the conventional thin plate continuous casting apparatus shown in FIGS. 1 and 2, and the corresponding parts and forces are given the same numbers. below,
If we omit this section that is common to the conventional system fffc,
Shaft retaining rings 4a, 4b are rotatably fitted onto the shafts 5c, 5d.

The lower part of the shaft holding ring 4b is connected to one end of the spring 4C, and the other end of the spring 4C is connected to the lower protrusion 5a of the hot water tank 5. The spring 4c pulls the shaft 3d downward. The shaft 3C is also pulled downward via 4a by a spring (not shown). ing.

On the other hand, the fixed mold 8 is fitted into a part of the molten metal sump 5. The partially cylindrical concave mold surface 8C of 8 is in sliding contact with the outer periphery of 5b. Surface pressure is applied to the sliding surface by a spring 40 or the like.

No. 1 is omitted in the diagram. However, a heating element can also be embedded inside the fixed mold 8.

The following four surfaces form the mold space.

The outer peripheral surface of the cylindrical part 3a of the rotary mold: - Inner view of the protruding parts 3b at both ends of the rotary mold; Partial cylindrical concave surface (mold surface 8c) of the two-sided fixed mold; The two-sided mold surface 8c has a wide and narrow slit. There is a shaped opening, which opens into the hollow part 8 through the passage 8b.
a, and molten slag 9 is stored inside this hollow portion 8a.

The 1ζ molten metal 2 flows from the gutter 7 into the sump 5, passes under the weir, and reaches the mold space. In the mold space, the molten metal 2 is mainly deprived of heat from the cylindrical portion 3a of the rotary mold 3, solidifies, and moves in the direction 3 together with the rotary mold 3.

The fixed mold 8 does not need to be cooled, but when casting a material with a high solidity point, a heating element (not shown) is embedded inside to heat the molten metal and solidify the molten metal from the side of the fixed mold 8. prevent This heating also ensures the fluidity of the molten slag 9.

Therefore, the slab 1 grows from the rotary mold 3 side, and when the thickness of the solidified layer reaches the thickness of the mold space, the slab 1 and the stationary mold 8 begin to slide. Since the area in which the two slide together is limited to the area near the mold outlet, the sliding resistance is not very large.

In that area, molten slag oozes out from the slit-shaped opening made in the V'i mold c and lubricates the two sliding interfaces.

[Effects of the present invention] 4. In the conventional method, it was difficult to maintain a constant thickness of 14 mm because the IT mold surface was only one surface, but in the present invention, the entire surface of one cast slab is surrounded by four mold surfaces. Therefore, the effect is that the variation in the dimensions of the entire surface of the slab is extremely reduced. Furthermore, in continuous casting using a fixed mold, troubles often occur due to sticking of the slab to the fixed mold and excessive sliding resistance, but in the present invention, molten slag is supplied to the interface between the fixed mold and the slab. By doing this, it is possible to prevent the slab from sticking to the fixed mold, and to make the mold surface of the fixed mold smooth, Ii! ;1 Troubles caused by sliding between the fixed mold and the slab can be eliminated.

Moreover, since the present invention is equipped with a pressure spring, the above-mentioned troubles can be further avoided and excellent young buds are produced. Incidentally, in the present invention as well, the advantage of the pull-up continuous casting method that the pouring method is easy arises as a matter of course.

[Brief explanation of drawings]

FIG. 1 is a plan view of a conventional drawing-type continuous thin plate casting apparatus, and FIG. 2 is a sectional view taken along the line I-1 in FIG. FIG. 3 is a plan view of a drawing-type continuous thin plate casting apparatus according to an embodiment of the present invention, FIG. 4 is a sectional view taken along the line ■-■ in FIG. 3, and FIG. FIG. 1: Slab 4: Bearing 2: Molten metal 4a, 4b: Shaft socket rig 3: Rotary mold 4c: Shaft socket spring 3a: Cylindrical part 5: Hot water reservoir 3b = End part (insulation part) 5a: Protrusion Part 3c: Shaft part 6: Weir 3d: Shaft part 7: Pouring channel 3e: Hollow part 8: Fixed mold 3f: Rotation direction 8a: Hollow part 8b: ] Mountain path 8C: Mold surface 9: Molten slag agent 1) Meifuku agent Ryo Hagiwara -

Claims (1)

[Claims] In a drawing-type thin plate continuous casting apparatus 6 using a rotary mold having protrusions on both edges, a circumferential mold is brought into contact with the outer periphery of the protrusion IJJ on both edges of the rotary mold (two mold spaces are formed 't7'J, And a bath molten slag outflow opening is provided on the mold surface of the circumferential mold.