JPH0255644A - Continuous casting machine for metal strip and method for producing metal strip - Google Patents

Abstract

PURPOSE:To produce a strip at high productivity by independently supporting under pressurizing back faces of endless belts with each divided cooling pad. CONSTITUTION:The cooling pads 3, 3' are composed of the divided cooling pads, which are vertically divided at least into each three pieces, and the endless belts 1, and 1' are supported under pressurizing with the cooling pads 3 and 3' at the back face thereof and introduced and run. The cooling pads introduce the endless belts 1 and 1' so that interval between 1 and 1' comes to wide at the upper part and narrow at the lower part to form an upward wider mold. Distribution of the strip thickness of the metal strip 9 to the width direction detected with a thickness detecting end 10 is transmitted to a hydraulic mechanism for controlling the pressurized force to the divided cooling pads 3-1-3-5 as a signal. Each hydraulic mechanism controls so that the divided cooling pads 3-1-3-5 come to the prescribed position by adjusting the pressurized force P1-P5. By this control, the metal strip 9 having the prescribed thickness distribution without any surface flaw, etc., can be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention continuously produces a ribbon directly from a molten metal. Concerning a metal ribbon continuous casting machine and its operating method.

[Prior Art] It is preferable that a metal ribbon can be directly produced from molten metal because the rolling process can be greatly simplified.

FIG. 4 shows an example of a twin-drum continuous thin metal plate casting machine described in Japanese Patent Application Laid-Open No. 61-27675. The molten metal 6 is transferred to two rotating drums 18-1 and 18-2 that rotate in the direction of the arrow.
The water is injected into the pool formed by the water. The molten metal in contact with the rotating drum is cooled from point m to point n to form a solidified shell, but the solidified shells formed on 18-1 and 18-2 respectively coalesce at point n and form the metal. The thin plate 9 is taken out. In order to increase productivity (tons/hour) with this method, the rotating drums 18-1 and 18-2 must be rotated quickly, but since the distance between points m and n is short,
If it is rotated too quickly, the thickness of the solidified shell will be insufficient, making it impossible to produce a thin metal plate with a predetermined thickness. Furthermore, increasing the diameter of the rotating drum results in extremely large-scale equipment.

Fig. 5 shows an example of a vertical double-belt continuous metal sheet casting machine.
1.19-2. Endless belt l running stretched across 19-3 and endless belt 1 running stretched synchronously
It is injected into the pool formed by . Endless belt 1
1'' is cooled by the cooling bag [20] on the back side, so the molten metal in contact with the endless belt forms a solidified shell, and is taken out as the metal plate 21 that has completely solidified. In order to manufacture a metal plate, the distance t between the endless belts 1 and 1' must be narrowed.
If is too small, the molten metal injection flow 22 will hit the endless belt, damaging the endless belt and damaging the surface texture of the metal plate 21, which is not preferable. As mentioned above, the twin-drum continuous thin metal sheet casting machine can produce thin metal sheets, but it is not easy to achieve high productivity, and the twin-belt continuous thin metal sheet casting machine, for example, Although high productivity can be obtained by arranging a large distance between 19-1 and 19-2 in FIG. 5, it is not easy to manufacture thin metal plates.

[Problems to be Solved by the Invention] The present invention discloses a continuous metal strip casting machine that can manufacture thin metal strips with high productivity, and a method for operating the same.

[Means and operations for solving problem 11] Fig. 1 is a schematic diagram of a continuous metal ribbon casting machine of the present invention, in which (A) is a side view and (B) is a cross-sectional view taken along line XX.

(C) is a YY sectional view.

(1) The continuous ribbon casting machine of the present invention consists of an endless belt 1 that forms the long side walls of the upper wide mold and rotates endlessly in the direction of arrow 2, and an endless belt that rotates in the direction of arrow 2'. 1'.

The endless belts I and 1'' of the present invention are metal belts stretched under tension. For example, 5-1.5
-2.5-3.5-4 is a tension pulley that applies tension to the endless belt 1 and causes it to run in the two directions of the arrows. In the present invention, the endless belts l and 1' are shown in FIGS.
), they run parallel to each other, facing each other.

The endless belts 1 and 1' are supported under pressure by cooling pads 3 and 3' on their back surfaces and guided to run. In the present invention, the cooling pad is formed by guiding 1 and 1'' so that the interval between 1 and 1'' is wide at the upper part (for example, the X-X cross section) and narrower at the lower part (for example, the Y-Y cross section). Form.

In FIG. 1, the molten metal 6 is injected, for example, through a nozzle 7 into a sump formed by the endless belts 1, 1' and the side weirs 4, 4'.

The back surfaces of the endless belts 1 and 1' are provided with cooling pads 3 and 3'.
It is cooled by, for example, water cooling.

The molten metal poured into the sump thus forms solidified shells 8 and 81 on the endless belts 1 and 1'.

At the lower end of the pool, 8 and 8' are combined to form a thin metal strip 9.
becomes.

In the present invention, for example, the cooling pad 3 is composed of a divided cooling pad that is vertically divided into at least three parts.

FIGS. 1(B) and 1(C) show a divided cooling pad 3-1. in which the cooling pad 3 is divided into five parts. ..., 3-5, but the number of divisions can be set to suit the width of the metal ribbon and operating conditions. Further, the cooling pad 3' may also be constituted by a divided cooling pad.

In the present invention, each divided cooling pad independently supports the back surface of the endless belt under pressure of, for example, pH..., P. The pressurizing forces P, .

In Fig. 1 (A), when Y-Y is reached, it is desirable that the solidified shells 8 and 8'' have a uniform thickness in the width direction of the metal ribbon, but the width of the metal ribbon is If it is wide, the thickness of the solidified shells 8 and 8' tends to become non-uniform due to variations in cooling conditions from X-x to Y-Y, as shown in Figure 1 (C).
is a schematic diagram showing an example in which the thickness is non-uniform. For example, at the position corresponding to the divided cooling pad 3-2, solidified shells 8 and 8'
is thin, and the unsolidified molten metal 6 is interposed between 8 and 8', and the solidified shells 8 and 8' are thick at positions corresponding to, for example, the divided cooling pads 3-3. The thickness of the solidified shell is the first
If an integral cooling pad (not formed by split cooling pads) is used when the cooling pad is uneven as shown in Figure (C), surface cracks are likely to occur in the thin metal strip, and the thickness of the thin metal strip may be affected. Otherwise, it is likely to become uneven. In the present invention, the cooling pad is composed of divided cooling pads, and each divided cooling pad independently supports the back surface of the endless belt with a pressing force commensurate with the thickness of the solidified shell. Prevents scratches and uneven thickness.

In the present invention, the cooling pad 3 is divided into at least three parts. According to the findings of the present inventors, both ends of the metal ribbon in the width direction (corresponding parts 3-1 and 3-5 in Fig. 1(C)) are located at the center part in the width direction (parts corresponding to 3-1 and 3-5 in Fig. 1(C)). 3-2 to 3-4 corresponding parts), the growth of the solidified shell is faster than that of the corresponding parts 3-2 to 3-4.
It is preferable to configure it with divided cooling pads.

(2) In Figure 1 (A), 10 is the plate thickness detection end, and the metal ribbon 9
Measure the plate thickness at multiple locations in the width direction.

Claim (2) of the present invention is a method for manufacturing a metal ribbon having a desired thickness distribution using the metal ribbon continuous casting machine of the above (1) and the plate thickness detection end 10.

The plate thickness distribution in the width direction of the metal ribbon 9 detected by the plate thickness detection end 10 is 1, for example, the divided cooling pads 3-1 to 3 in FIG. 1(C).
-5 is transmitted as a signal to the hydraulic mechanism that controls the pressurizing force, and each hydraulic mechanism adjusts the pressurizing force P0 to P and controls the divided cooling pads 3-1 to 3-5 to be in the desired position. do. By this control, a metal ribbon 9 free from surface cracks and the like and having a desired thickness distribution can be obtained.

(3) Claim (3) of the present invention is based on the above (1) and (2).
This is another method of manufacturing a metal ribbon using the metal ribbon continuous casting machine and the plate thickness detection end 10 described in . in this way,
The pressure applied to the endless belt by each divided cooling pad is set so that the pressure applied to the slab is uniform in the width direction of the slab. That is, for example, in FIG. 1(C), P to P are set to the same pressing force per unit length.

This uniform pressurization effectively prevents the occurrence of surface cracks on the metal ribbon 9. With this method, the plate thickness distribution of the metal ribbon 9 detected by the plate thickness detection end 10 is
The signal is transmitted as a signal to a cooling water flow rate control valve and a cooling water temperature regulator, which are respectively provided independently, and each divided water cooling pad independently controls the amount and temperature of cooling water injected into the endless belt. Figure 2 shows a divided cooling pad (e.g. 3-1
) is a diagram illustrating a mechanism for pressurizing and cooling the endless belt 1.

14 is a fixed support part, and the divided cooling pad 3 is connected by hydraulic pressure 15.
-1 presses the endless belt 1 with a force of P. 11 is a cooling water pipe provided in the divided cooling pad 3-1, and the cooling water 16 passes through a cooling water temperature regulator 13 and a cooling water flow rate control valve 12.
The cooling water is supplied to the cooling pad 3-1 and the cooling water spray nozzle 1
Spray from 7 onto endless belt 1. By controlling the amount and temperature of the cooling water, the solidified thickness of the solidified shell 8 shown in FIG. 1(C) can be adjusted to ? A solidified shell 8 is formed with the desired thickness distribution in the width direction of the metal ribbon 9 when the solidified shell 8 reaches Y-Y in FIG. A metal ribbon is obtained.

(4) Figure 3 shows the side weir 4 that can be set by moving it in the width direction of the endless belts 1, 1', (A) is a side view, and (B) is a 2-2 end face. (C) is a WW end view.Claim (4) of the present invention includes the above-mentioned (1) or (
In the metal ribbon continuous casting machine described in 2) or (3), the side weir 4 is arranged at a position that matches the width of the metal ribbon to be cast. At this time, the divided cooling pads (3-1 and 3-5 in Figure 3 (C)) at the position where the side weir 4 is placed apply pressure (P8 and pg in Figure 3 (C)) to the endless belt. The endless belt 1 is sandwiched between the side weirs 4, 4' and the divided cooling pad 3-1, and at the same time, the endless belt 1' is sandwiched between the side weirs 4, 4' and the cooling pad 3'. If the gap between the endless belt 1 or 1' and the side weir 4 or 4' is large, hot water will form in this gap, making it difficult to continue the casting operation.In the present invention, the side weirs 4 and 4' are arranged. Even if the position of the side weir changes, the pressure applied to the divided cooling pad at the position where the side weir is arranged must be large enough that the gap between the endless belt and the side weir does not become large, and that the belts 1 and 1' bite the side weir. It is characterized by being small enough not to damage the side weirs and being able to be controlled independently.

[Example code] Example 1 It has a structure as shown in Figure 1, and the belt thickness is 1mm.

Belt @ 800mm, minimum gap of cooling pad (
The radius of curvature near the first Y-Y position (hereinafter referred to as the "kissing point") was 600 mm, and the cooling pad was made of 5US304 stainless steel using a casting machine in which the cooling pad was divided into five equal parts in the width direction. Temperature 1490 with
℃ molten steel was poured so that the height of the surface of the pool was 500mm from the kissing point, and the wall thickness was 2ma+,
A metal ribbon with a width of 800 mm was manufactured. The five cooling pads initially arranged in the width direction of the slab were all controlled at the same position, so the thickness of the slab in the width direction was almost uniform. On the other hand, the purpose was to give the slab a plate crown of 50μ noodles.

When the cooling pad 3-1.3-5 on one side was pushed out to one side by 40 μrsH, and the cooling pad 3-2.3-4 was pushed out to the cast side by 10 μm, and the position of the cooling pad 3-3 remained unchanged, it was approximately 50μ- I was able to get a plate crown. Note that the reason why only the cooling pads on one side are operated is to simplify the apparatus, and it goes without saying that the cooling pads on both sides may be operated.

Example 2 Using the same casting equipment as in the above example, the cooling pad 3-1.3-5 was extruded by 64 μm to the casting side for the purpose of casting a plate crown slab weighing 80 μ from the beginning. When 3-2.3-4 was positioned and cast at a position where it was pushed out by 16 μm on the casting side, the plate crown achieved a thickness of approximately 80 μm, but the width direction distribution of the solidified shell thickness and the width of the outlet side plate thickness were Vertical cracks occurred due to uneven reduction due to mismatch in directional distribution. Therefore, the position control of the divided pads was switched to pressure control so that the average value of the rolling blade that was occurring at that time was uniformly applied to each divided pad. As a result, the vertical cracks were eliminated, but the plate crown of the slab was reduced to almost zero. Therefore, the cooling water that had been uniformly supplied to each cooling pad at 2Nm3/min, was now supplied to cooling pad 3-3 at 3Nm3/min, and cooling water was supplied to cooling pad 3-2.
2.7Nm3/min on cooling pad 3-1.3-5
When distributed as Nm3/min, the crown of the plate was 80 μm.
We were able to obtain a slab without any cracks.

Example 3 Using the same casting equipment as in the above example, a plate width of 600 Ill was made.
In order to cast a positive slab, the side weirs were set at positions that were pushed 100 mm into each side of the cast as shown in Figure 3. At this time, the positions of the cooling pads 3-2 to 3-4 were controlled, but the cooling pads 3-1 and 3-5, which push the side weirs, should be pressed to avoid the hot water and not to bite the side weirs. The pressure was controlled so that a pushing force of 150 kg was constantly applied. As a result, slabs with a plate width of 600m+++++ could be smoothly cast without producing hot water.

[Effects of the Invention] In the present invention, the shape of the cooling pad is
By arranging a long interval between Y and Y, a solidified shell of the necessary thickness can be formed even when casting is performed with high productivity, and thus metal ribbon can be stably produced at high speed.

In the present invention, it is possible to produce thin metal strips, but since the present invention forms a wide upper mold with 1 and 1', even if thin metal strips are cast, the endless belt may be damaged. or
It does not damage the surface of the thin metal plate.

The present invention can prevent the occurrence of cracks in the metal ribbon because the solidified shell is pressurized without strain.

In the present invention, since the thickness of the solidified shell is made uniform, a metal ribbon with good dimensional accuracy can be obtained.

In the present invention, the side weir can be placed at a position that matches the width of the metal ribbon to be manufactured, so it is easy to adjust the equipment when changing the width of the metal ribbon to be cast.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the continuous ribbon casting machine of the present invention, and FIG. 2 is an explanatory diagram of a mechanism in which divided cooling pads pressurize and cool an endless belt. FIG. 3 is a diagram showing an example of a side weir that can be set by moving it in the width direction of an endless belt, and FIG. 4 is a diagram showing an example of a rotating drum type continuous thin metal sheet casting machine. FIG. 5 is a diagram showing an example of a twin-belt type continuous thin metal plate casting machine. 1.1″: Endless belt, 2.2′: Running direction of endless belt, 3.3′: Cooling pad, 4: Side weir,
5: Tension pulley, 6: Molten metal, 7: Nozzle,
8: Solidified shell, 9: Metal ribbon, 10: Plate thickness detection end, 11: Cooling water piping 12: Cooling water flow rate control valve, 1
3: Cooling water temperature regulator, 14: Fixed support part, 15: Oil pressure, 16: Cooling water. 17: Cooling water spray nozzle. Figure 1 (A) Figure 2 (XX diagram) (Y-Y diagram) Figure (Z-Z diagram) (W-W diagram) Figure

Claims (4)

[Claims] (1) Endless belt 1 that forms the long side walls of the upper wide mold and rotates in the direction of arrow 2, endless belt 1' that rotates in the direction of arrow 2', and the back surfaces of endless belts 1 and 1'. In a metal ribbon continuous casting machine having cooling pads 3 and 3' guided by pressure bearing, the cooling pad is divided into at least three vertically divided cooling pads, and each divided cooling pad has an independent back surface of an endless belt. A continuous casting machine for metal ribbon, which is characterized by pressurized support. (2) Endless belt 1 that forms the long side walls of the upper wide mold and rotates in the direction of arrow 2, endless belt 1' that rotates in the direction of arrow 2', and the back surfaces of endless belts 1 and 1'. It has cooling pads 3 and 3' which are guided by pressure support, and the cooling pad is made up of at least three divided cooling pads vertically, and each divided cooling pad independently supports the back surface of the endless belt by pressure. In a continuous metal ribbon casting machine, the thickness distribution in the width direction of the metal ribbon to be taken out is measured, and based on the measurement results, the pressure support position of the endless belt by each divided cooling pad is controlled to form the desired sheet. A method of producing metal ribbon with thickness distribution. (3) Endless belt 1 that forms the long side walls of the upper wide mold and rotates in the direction of arrow 2, endless belt 1' that rotates in the direction of arrow 2', and the back surfaces of endless belts 1 and 1'. It has cooling pads 3 and 3' which are guided by pressure support, and the cooling pad is made up of at least three divided cooling pads vertically, and each divided cooling pad independently supports the back surface of the endless belt by pressure. In a continuous metal ribbon casting machine, the pressure bearing force applied to the endless belt of each divided cooling pad is set so that the pressure applied to the slab is uniform in the width direction of the slab, and the width of the metal ribbon to be taken out is adjusted. A method of manufacturing a metal ribbon with a desired width distribution by measuring the thickness distribution in the direction and controlling the temperature and/or flow rate of the cooling water added to the endless belt by each divided cooling pad based on the measurement results. (4) Endless belt 1 that forms the long side walls of the upper wide mold and rotates in the direction of arrow 2, endless belt 1' that rotates in the direction of arrow 2', and the back surfaces of endless belts 1 and 1'. It has cooling pads 3 and 3' which are guided by pressure support, and the cooling pad is made up of at least three divided cooling pads vertically, and each divided cooling pad independently supports the back surface of the endless belt by pressure. In a continuous metal ribbon casting machine, a side weir 4 movable in the width direction of the endless belt 1 is arranged at a position that matches the width of the metal ribbon to be cast, and a divided cooling pad at the position where the side weir 4 is arranged is A method for manufacturing thin metal strips with different widths, characterized by controlling the pressure bearing force applied to the endless belt and sandwiching the endless belt between a side weir 4 and a cooling pad.