JPH02211945A - Continuous metal ribbon casting equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for continuously producing a metal ribbon directly from a molten metal.
This invention relates to continuous metal ribbon casting equipment.

[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. 5 shows an example of a twin-drum continuous thin metal sheet 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 molten metal in contact with the 0-rotation drum, which is injected into the sump formed by The solidified shells coalesce at point n and are taken out as a thin metal plate 11. In order to increase the productivity (ton per hour) with this method, the rotating drum must be rotated quickly, but because the distance between the 1m point and the n point is short, if the drum is rotated quickly, the thickness of the solidified shell will be insufficient. However, if the diameter of the rotating drum is increased, the equipment becomes extremely large-scale.

FIG. 6 shows an example of a twin-belt continuous thin metal plate casting machine described in Japanese Patent Application Laid-Open No. 59-47047. The molten metal 6 is transferred to a pulley 19-1.19-2.19- rotating in the direction of the arrow.
The water is injected into a pool formed by the endless belt 1 that runs across the belt 3 and the endless belt 1' that runs synchronously with the belt. Endless belts 1 and 11.

Since the back side is cooled by the cooling device 20, 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 produce a thin metal plate using this method, the distance t between the endless belts 1 and 1' must be narrowed, but if t is made too small using this method, the injection flow 22 of the molten metal will become endless. When it hits the belt, it damages the endless belt and also damages the surface of the metal plate 21.
Undesirable.

As mentioned above, the twin-drum continuous thin metal sheet casting machine can produce thin metal sheets, but it is not easy to obtain high productivity, and the twin-belt continuous thin metal sheet casting machine, for example, Although high productivity can be obtained by increasing the distance between 19-1 and 19-2 in FIG. 6, 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 apparatus that can manufacture thin metal strips with high productivity and can control the thickness distribution of the metal strip with high accuracy.

[Means and effects for solving the problems] Fig. 1 is an overall view of an example of the continuous metal ribbon casting apparatus of the present invention, in which (A) is a side view, (B) is a cross-sectional view taken along line XX, (C) is a YY sectional view.

## band continuous casting apparatus of the present invention has an upper roll 2 and a lower roll 3.
An endless belt 1 that is inclined and runs in the direction of the arrow 5, for example, and an upper roll 2' and a lower roll 3' that are disposed facing the endless belt 1 that is inclined and runs in the direction of the arrow 5', for example. The long side surface of the inner wall of the upper wide mold is formed by the endless belt 1' running on the mold. In the present invention, the endless belts 1 and 11 are stretched under tension, for example, by tension rolls 8 and 81. 7 and 7' are side weirs 1, for example, upper wide molds along the running direction of the endless belts 1 and 1'', which are sandwiched between the endless belts and form the short sides of the inner wall of the upper wide mold.The molten metal 6 is Injected into the mold, the endless belt forms a solidified shell to, 10' in the mold, as the back side is cooled by the cooling pad 9.9', and a solidified shell 10.10' at the lower end of the mold. The metal ribbons 11 are combined together.

The continuous thin strip casting apparatus of the present invention differs from the twin-drum type continuous thin plate forming machine described above in that the upper roll 2 (2') and the lower roll 3 (3') are pre-separated. Therefore, even when casting at high speed, a sufficiently thick solidified shell 10,10' can be obtained to produce a metal ribbon of a predetermined thickness. Furthermore, unlike the previously mentioned twin-belt type continuous thin plate casting machine, the continuous thin strip casting apparatus of the present invention injects the molten metal into a mold with a wide top, so it is easy to cast even when casting thin metal strips. .

The flow of the molten metal does not hit the endless belt and damage the endless belt or the surface of the metal ribbon 11.

In the continuous ribbon casting apparatus of the present invention, the solidified shells 10 and 10
When merging ', lower rolls 3 and 3' press the solidified shell via endless belts l and 1'. This pressurization adjusts the thickness and cross-sectional shape of the metal ribbon 11.

This equipment can produce metal ribbons that are thin and require a small amount of reduction in the thickness direction during rolling in the subsequent process. However, in this case, it is important to accurately control the shape of the metal ribbon so that it is suitable for the subsequent rolling process. For example, a metal thin strip with a crown or concave cross-sectional thickness distribution that is not suitable for subsequent rolling is not a desirable rolled material because it will cause flatness defects such as mid-elongation and ear waves in the thin sheet after rolling. do not have.

In the present invention, the lower roll 3 (3') is the presser roll 12 (12).
'), lower roll 3 (3') and presser roll 12 (1
Adjust the pressing force of 2') to make the metal thin? Accurately control the thickness distribution of 1F11. This presser roll may be provided on either one of the lower rolls, or may be provided on both of the lower rolls 3 and 3' as shown in FIG. 1(C).

Figure 2 shows the lower roll 3 and presser roll 1 in the Y-Y cross section of Figure 1.
FIG. 2 is a detailed diagram of No. 2. The roll chock 13 of the lower roll 3 and the roll chock 14 of the presser roll 12 are a pressing mechanism (
For example, they are connected by a hydraulic cylinder) 15.

When the pressing mechanism 15 is activated to bring the roll chocks 13 and 14 close together, the lower roll 3 and the presser roll 12 are pressed against each other, and the lower roll 3 is bent in the direction of the arrow 23.6 In the present invention, the pressing force of the pressing mechanism 15 is is adjusted to bend the lower roll 3 as desired.

Due to this deflection of the lower roll 3, the thickness distribution of the metal ribbon 11 can be controlled to be suitable for the next rolling process. Therefore, when the apparatus of the present invention is used, a thin plate with a small amount of reduction in the thickness direction during the rolling process can be produced. A thick metal thin strip is also a preferable rolled material because it suppresses elongation, ear waves, etc. of the thin sheet after rolling.

FIG. 2(A) shows a case according to claim (2), in which the body length is shorter than that of the lower roll 3, the body is disposed at the center of the lower roll 3, and the center of the lower roll 3 is directed in the direction of the arrow 23. bend it.

It is a figure which shows the example of a presser roll.

FIG. 2(B) is an example of a presser roll having a roll crown according to claim (3), and is a diagram showing an example in which the lower roll 3 is bent in the direction of the arrow 23 by this crown.

FIG. 2(C) is an example of the presser roll according to claim (4). This presser roll includes a roll shaft 16 and a plurality of short body rolls 12-1. ..., 12-n are fitted together. FIG. 3 is a Z-Z sectional view of the short body roll 12-1, for example.

The eccentric sleeve 17-1 can be set by rotating the outer periphery of the roll shaft 16. A rotatably arranged ring roll 4-1 is provided on the outer periphery of the eccentric sleeve 17-1. When the eccentric sleeve is rotated from the state shown in FIG. 3(A) and adjusted and set as shown in FIG. 3(B).

The short roll 12-1 presses the lower roll 3 in the direction of arrow 23 in FIG. 2(C). Eccentric sleeve 17-1.・
. . 17-n can be independently rotated and set as desired. Therefore, the pressing roll shown in FIG. 2(C) can bend the lower roll 3 in the direction of the arrow 23 and in the direction of the dotted arrow 23' in conjunction with the adjustment of the pressing mechanism 15, and can bend the slab. The plate thickness distribution can be controlled more precisely.

FIG. 4 shows another example of the mechanism for pressing the lower roll 3 against the presser roll 12, and (A) shows one lower roll chock 13.
The pressing shown in Figure 2 shows the case where a mechanism is installed, and (B) shows the pressing mechanism inserted between the lower roll chocks 13 and 13'. have

[Example 1] It has a structure as shown in Fig. 1, and the belt wall thickness is lam.

Using a casting machine with a belt width of 800 mm, SO5304
Molten steel having a stainless steel composition at a temperature of 1490° C. was poured into a tundish to produce a metal ribbon with a wall thickness of 2 mm and a plate width of 600 mm. The diameter of the lower roll 3 is 150 mm, the distance between the roll chocks 12 on the drive side and the work side is 1500 mm, and the presser roll 12 has a stepped structure as shown in Fig. 2 (A), and the maximum diameter is 300 mm. The length of the trunk is 300 mm.

Considering the thermal expansion of the lower roll 3 after the start of casting, the lower roll 3 is provided with a concave crown of 0.2 mm/diameter for a body length of 900 mm, so that a uniform plate thickness can be obtained at the start of casting. Lower roll 3 with a force of 0.58 tonf to obtain pieces.
was pressed against the presser roll 12 to start casting.

As a result, slabs with uneven plate thickness distribution were obtained at first, but by the time a slab of approximately 10 m had been cast from the start of casting, the slab thickness distribution was 1.95+u+ at the center and 1.95+u+ at the edges. 2.00 It became an ugly concave crown. Therefore, when the pressing force between the lower roll 3 and the presser roll 12 was lowered to 0.23 tonf, a slab with a substantially -like thickness was again obtained.

[Example 2] It has a structure as shown in Figure 1, and the belt thickness is 1mm.

Using a casting machine with a belt width of 800mm, SO330
Molten steel having a stainless steel composition of No. 4 at a temperature of 1490° C. was poured into a tundish to produce a metal ribbon with a wall thickness of 2 mm and a plate width of 600 mm. The diameter of the lower roll 3 is 150 ma, and the distance between the roll chocks 12 on the drive side and work side is 1500 mm.
, and the presser roll 12 has a diameter of 9 as shown in FIG. 2(B).
It has a convex crown of 0.4 mm/diameter for a body length of 0.00 mm, and the maximum diameter is 300 mm. In consideration of the thermal expansion of the lower roll 3 after the start of casting, a concave crown of 0.2 s + m/diameter is provided on the lower roll 3 for a body length of 900 mm, so that a uniform plate thickness can be obtained at the start of casting. To obtain a piece, lower roll 3 with a force of 1.0 Otonf.
was pressed against the presser roll 12 to start casting.

As a result, slabs with uneven plate thickness distribution were initially obtained, but after casting a slab of about 10 m from the start of casting, the slab thickness distribution was 1.95+am at the center and 1.95+am at the ends. 2.00
■It has become a concave crown for shoes. Therefore, when the pressing force between the lower roll 3 and the presser roll 12 was lowered to 0.22 tonf, a slab with a substantially -like thickness distribution was again obtained.

[Example 3] It has a structure as shown in Fig. 1, and the belt wall thickness is lam.

Using a casting machine with a belt width of 800m5+, SO330
Molten steel having a stainless steel composition of No. 4 at a temperature of 1490° C. was poured into a tundish to produce a metal ribbon with a wall thickness of 2+us and a plate width of 600+sm. The diameter of the lower roll 3 is 150+am
, the distance between the roll chocks 12 on the drive side and the work side is 150
0++n, and the presser roll 12 is a short body roll 12-1.12-2°12-3.12-4.12 obtained by dividing the entire body length of 9001 into five in the width direction as shown in FIG. 2(C). -5
The outer diameter of each short roll is 300 mm, and by controlling the position of the eccentric sleeve, the position of each short roll can be controlled within a range of ±1.5■■ with respect to the slab.

In consideration of the thermal expansion of the lower roll 3 after the start of casting, a concave crown of 0.2 mm/diameter is given to the lower roll 3 for the body length of 900 mm, so that a uniform plate thickness is obtained at the start of casting. In order to obtain a slab, the lower roll 3 is pressed against the presser roll 12, and the position of the divided rolls is 12-2°, 12-4 is the neutral position, and 12-3 is +0.05 mm (extruded in the direction of the slab). 12-1.12-5 was set at the position of -0.15 s (pulled in the opposite direction to the slab) and casting was started. As a result, a slab with uneven plate thickness distribution was obtained at first, but after casting a slab of about 10 m from the start of casting, the thickness distribution of the slab was 1.95 m in the center.
+*, the plate end had a concave crown of 2.00+*m. Therefore, the pressure between the lower roll 3 and the presser roll 12 is kept as it is, and the position of each divided roll is set to 12-2°, 12-4 is set to the neutral position, and 12-3 is set to +0.02+am, 1'2
-1.12-5 was set at the position of -0,065 m, and a slab with a substantially --like plate thickness distribution was again obtained.

[Effects of the Invention] By using the continuous metal strip casting apparatus of the present invention, thin metal strips can be manufactured with high productivity, and the metal strip can be accurately controlled into a shape suitable for rolling in the next step.

[Brief explanation of the drawing]

FIG. 1 is an overall diagram of an example of the continuous metal ribbon casting apparatus of the present invention. FIG. 2 is a diagram showing details of the lower roll 3 and presser roll 12. FIG. 3 is a diagram showing the details of the lower roll 3 and presser roll 12. Figure 4 shows the details of the pressing mechanism of the lower roll 3 and presser roll 12; Figure 5 shows a twin-drum continuous metal strip casting machine; Figure 6 , a diagram showing a known twin-belt type continuous metal sheet casting machine. 1.1': Endless belt, 2.2': Upper roll,
3.3': Lower roll, 4 (4-1 to 4-n) Nilling roll, 5.5'': Belt running direction, 6: Molten metal, 7.7': Side weir, 8.8': Tension roll , 9.9': Cooling pad, 10.10'
: Solidified shell, 11: Metal ribbon, 12.12' :
Presser roll, 12-1 to 12-n: Short body roll,
13.13': Roll chock, 14: Roll chock presser, 15: Pressing mechanism, 16 Two roll shafts,
7 (17-1 to l7-n): Eccentric sleeve, 1
8: Rotating drum, 19.19″: Rotating pulley 20
: Cooling device, 21: Total bending plate, 22: Molten metal injection flow, 23
．． 23': Deflection direction. Patent applicant Nippon Steel Corporation

Claims (4)

[Claims] (1) Upper roll 2 (2') and lower roll 3 (
It has endless belts 1 and 1' that run inclined between 3' and 1' to form the long side walls of the upper wide mold, and the lower roll is equipped with a presser roll, and the lower roll and the presser roll are connected via a roll chock. Adjust the pressing force of the endless belt 1 at the bottom end of the mold.
A continuous metal ribbon casting device that controls the thickness distribution of the metal ribbon taken out from the gap between and 1'. (2) Claim (1) wherein the presser roll is a presser roll whose body length is shorter than the lower roll and presses the center part of the lower roll.
) Continuous metal ribbon casting apparatus described in (3) The metal ribbon continuous casting apparatus according to claim (1), wherein the presser roll has a roll crown and presses the lower roll with the roll crown. (4) The presser roll has a common roll shaft 16 and a plurality of eccentric sleeves 17-1 to 17-n that are arranged eccentrically around the roll shaft and can be set by rotating the outer circumference of the roll shaft 16, and the eccentric sleeves Ring rolls 4-1 to 4- are rotatably arranged around the outer periphery of each of 17-1, . . . , 17-n.
The metal ribbon continuous casting apparatus according to claim (1), which is a presser roll equipped with short body rolls 12-1, . . . , 12-n having a diameter of