JP2000000641A - Twin roll casting apparatus for casting metallic strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a twin roll casting apparatus for casting a metallic strip providing a new roll bias system for minimizing a friction source during operating. SOLUTION: One pair of side part weir plates 18 which form side part demarcated closures in a casting pool part by slidingly engaging with the end surfaces of the casting rolls 1, are held with one pair of plate holders 25 and each thruster 21 so as to apply the closing inward mutually faced to each side part weir plate 18, is connected with each plate holder 25 through a horizontal pivot pin 26 and a vertical pivot pin 28 (pivot connecting parts). Then, in the twin roll casting apparatus for casting the metallic strip constituted so that the plate holders 25 can be tilted in the roll longitudinal direction with the horizontal axial line in the roll lateral direction as the center and the side part weir plates 18 can automatically be matched with the end surfaces of the casting roll 1 by tilting the plate holders, compressive coil springs as the tilting resistant means to the tilting of the plate holders 25 are arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a twin roll casting apparatus for metal strip casting.

[0002]

2. Description of the Related Art In a twin-roll casting apparatus, molten metal is introduced between a pair of horizontal casting rolls that are cooled and rotate in mutually opposite directions, a metal shell is solidified on a moving roll surface, and the metal shells are formed in a roll gap. The metal shells are coalesced and fed down through a roll gap as a solidified solidified metal strip. As used herein, the term "roll gap" is intended to refer to the entire area where the rolls are closest. The molten metal is poured from the ladle into one or a series of small containers, from which it flows to a metal feed nozzle located above the roll gap and into the roll gap, and consequently roll casting just above the roll gap A casting pool of molten metal supported on the surface and extending longitudinally of the roll gap can be formed. The ends of the pool are formed by side dams which are held in sliding engagement with the roll end faces to prevent overflow from both ends of the pool.

[0003] Installation and adjustment of the casting rolls is a significant problem. The casting roll must be correctly installed and the proper width of the roll nip properly set, usually on the order of a few millimeters. There is also a need for means to allow at least one of the casting rolls to move outward against a biasing force, particularly to accommodate variations in strip thickness at the start of operation.

[0004]

However, the device proposed in the prior art uses a roll mounting / developing means that requires relative sliding between individual components at some positions, so that some friction is required. A load source was created which hindered accurate positioning of the casting roll and accurate measurement of the roll biasing force.

It is an object of the present invention to provide a twin roll casting apparatus for metal strip casting with a novel roll offset system that minimizes the source of friction during operation.

[0006]

According to the present invention, a pair of substantially horizontal casting rolls 1 forming a roll gap 2 therebetween, and molten metal is supplied to the roll gap 2 and supported by the casting rolls 1. Metal supply means 3, 4 and 5 for forming a casting pool 6 of the molten metal, and a pair of side dams which are slidably engaged with the end faces of the casting roll 1 to form side defining closures of the casting pool 6. A plate 18, a driving means 10 for rotating the casting roll 1 in the mutual direction to produce a solidified metal strip 19 supplied downward from the roll gap 2, and a pair of plate holders 25 for holding each side dam 18 And a pair of substantially horizontally acting thrusters 21 capable of applying inward closing forces opposing each other to each side dam plate 18, one thruster 21 for each plate holder 25. Via pivot connections 26 and 28 The metal strip casting is configured so that the plate holder 25 can be tilted in the longitudinal direction of the roll about the horizontal axis in the horizontal direction of the roll, and the side dam plate 18 can be automatically aligned with the end face of the casting roll 1 by the tilt. In the twin roll casting apparatus, there is provided a twin roll casting apparatus for metal strip casting, wherein a tilt resistance means 41 for tilting the plate holder 25 is provided.

Further, in the present invention, the tilt resistance means 4
1 can be constituted by a biasing means that acts on the plate holder 25 and biases the plate holder 25 to a position that is particularly inclined with respect to the horizontal axis in the horizontal direction of the roll that forms the tilting center of the plate holder 25.

The thruster 21 can be constituted by a pair of pressure fluid piston cylinder units 22. Further, the thruster 21 is acted on by the pressure fluid piston cylinder units 22 and is connected to the plate holder 25 via pivot connection portions 26 and 28. It is also possible to configure the thruster body 29 pivotally connected to the thruster body 29.

The biasing means 41 is preferably constituted by a spring means acting between the plate holder 25 and the thruster body 29. The spring means comprises two pairs each of which acts on each of the plate holders 25. It is possible to configure with a compression coil spring.

Further, the pivot connection portions 26 and 28 are limited to a vertical pivot axis and a horizontal pivot axis which is perpendicular to the vertical pivot axis and extends in the lateral direction of the roll end. Can be limited to pivoting about the vertical and horizontal pivot axes.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS In order to more fully describe the present invention, application to specific embodiments will be described in detail with reference to the accompanying drawings.

FIGS. 1 to 4 show an embodiment of the present invention. The illustrated twin-roll casting apparatus mainly includes a pair of casting rolls 1 forming a roll gap 2 therebetween. In the casting operation, the molten metal is supplied from a ladle (not shown) to the roll gap 2 between the casting rolls 1 through the tundish 3, the distributor 4, and the supply nozzle 5, and the molten metal is supplied above the roll gap 2. Create casting pool 6. The end of the casting pool 6 is defined by a side weir plate 18 comprising a pair of refractory closing plates, which abut against the stepped end of the casting roll 1 by a pair of thrusters 21 comprising a pressure fluid piston cylinder unit 22. . By moving the stopper rod 7 provided in the tundish 3, the molten metal is removed from the tundish 3.
Through the outlet nozzle 8 and the refractory shroud 9 to the distributor 4.

The casting roll 1 is driven by the driving means 10 to rotate and water-cool in the opposite directions, so that the shell solidifies on the moving roll surface and is joined by the roll gap 2 to form a solidified metal strip 19 at the roll exit. Built. This solidified metal strip 19 can be fed to a standard coiler (not shown).

To this extent, the illustrated twin roll casting apparatus has been described in greater detail in Australian Patent 664670 and US Pat. No. 5,488,988, and as such, may not be part of the present invention. Reference can be made to these patents for structural details of the patent.

A plate holder 25 on which the side dam plate 18 is mounted.
Is pivotally connected to the thruster 21, so that the side weir plate 1
8 can be tilted about the pivot connection, and the thrusters 21 can apply opposing closing forces to the side dam 18 via the pivot connection. Here, the pivot connection portion is configured such that each side weir plate 18 can swing in the longitudinal direction of the roll by pivoting movement about the horizontal pivot axis in the lateral direction of the roll, and pivoting movement about the vertical pivot axis perpendicular to the horizontal pivot axis. Is provided so as to be able to swing in the lateral direction of the roll, and since the turning movement of the side dam plate 18 is limited to the movement about these two axes, the plane rotation of the side dam plate 18 is prevented. It is made to come off.

As best shown in FIGS. 3 and 4, the plate holder 25 with each side dam plate 18 mounted thereon is
The end of each thruster 21 is pivotally connected to a thruster body 29 by a horizontal pivot pin 26 and a pair of vertical pivot pins 28. The vertical pivot pin 28 is fixed to the thruster body 29 and is fitted in the long hole 27 of the plate holder 25. Slot 2
7 is elongated in the longitudinal direction of the thruster 21 so that a small gap is created around the vertical pivot pin 28, so that a limited swinging of the plate holder 25 in the roll longitudinal direction around the horizontal pivot pin 26 is possible. .

The horizontal pivot pin 26 is also attached to the thruster body 29 and engages with the inwardly projecting bearing 30 of the plate holder 25, so that the plate holder 25
The roll can swing laterally about a vertical axis defined by: The degree to which the plate holder 25 can swing freely in this way can be limited by engagement with a stop on the thruster body 29.

The plate holder 25 is constituted by a side member 31 provided with an inward groove to receive the side dam plate 18, and a stainless steel back plate 32 connected to the side member 31 is attached to the holder body 33 by a stud 34. The connection creates an air gap between the back plate 32 and the holder main body 33. The air gap insulates the holder body 33, and the side dam plate 1
8 can easily be replaced if the part that actually engages is damaged or distorted by use.

Since the horizontal pivot pin 26 is located at a height higher than the level of the roll gap 2 between the casting rolls 1, the effect of the outward pressure applied to the side dam plate 18 by the molten metal in the casting pool 6. Then, the side weir plate 18 is rotatably biased around the pivot in the direction in which the bottom end is biased inward, and the casting pool 6 is rotated.
A seal pressure increase at the bottom occurs. In this configuration, the side dam plate 18 can be tilted, so that the deformation of the end face of the casting roll 1 due to thermal expansion during casting can be absorbed, and the biasing action of increasing the sealing force at the bottom of the casting pool 6 is maintained.
The increase in static iron pressure in the casting pool 6 (which has the greatest tendency to leak at the bottom) can be countered.

According to the present invention, the tilting of the plate holder 25 about the horizontal pivot pin 26 is resisted by the biasing spring means, that is, the compression coil spring 41 acting between the plate holder 25 and the thruster body 29. Receive. The inner end of the compression coil spring 41 is positioned in a cylindrical socket drilled in the holder body 33, and the outer end is the flat surface 4 of the thruster body 29.
Contact 2

A pair of compression coil springs 41 acting on each plate holder 25 are disposed above and below the horizontal pivot pin 26, and bias the plate holder 25 to a position for holding the side dam plate 18 in the vertical direction. It is made to let. Therefore, although the side dam plate 18 is mounted so as to be tiltable, the tilting gradually generates resistance. This allows
It is possible to avoid a possibility that the upper end of the side dam plate 18 is excessively worn.

It should be understood that the embodiments of the present invention described above are merely exemplary and that there are many alternatives to the means that can resist tilting of the side dams. For example,
The compression coil spring of the described configuration can be replaced by solid compression stops, and these stops can be positioned at appropriate positions that can limit the tilting of the plate holder to control the resistance to braking. By installing a compression stop in the long hole 27 of the plate holder 25, it is also possible to limit the swing of the plate holder 25 around the horizontal pivot pin 26. A roll biasing device that incorporates both a spring and a hydraulic actuator may be provided.

Proper positioning of the pivot depends on the diameter of the casting roll, the height of the casting pool, and the thickness of the strip being cast. Accurate positioning of the pivot is fully disclosed in Applicants' Australian Patent Application No. 34397/95 and U.S. Patent No. 5,588,479.

[0024]

As described above, according to the present invention,
Although the side dams are tiltably attached, the tilting is caused to gradually generate resistance, so even if inward closing forces opposing each other are applied to each side dam by the thruster, The friction source during operation can be suppressed to a minimum, and the upper end of the side weir plate is excessively pressed against the end face of the casting roll and wears out. An excellent effect that the possibility that the measurement is hindered can be avoided beforehand can be achieved.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a twin roll casting apparatus.

FIG. 2 is a plan view of the twin roll casting apparatus shown in FIG.

FIG. 3 is a view showing one of a pair of side dam plate applicators incorporated in a twin roll casting apparatus.

FIG. 4 is a view in the direction of arrows IV-IV in FIG. 3;

[Explanation of symbols]

REFERENCE SIGNS LIST 1 casting roll 2 roll gap 3 tundish (metal supply means) 4 distributor (metal supply means) 5 supply nozzle (metal supply means) 6 casting reservoir 10 drive means 18 side dam board 19 solidified metal strip 21 thruster 22 pressure fluid Piston cylinder unit 25 Plate holder 26 Horizontal pivot pin (pivot connection part) 28 Vertical pivot pin (pivot connection part) 29 Thruster body 41 Compression coil spring (tilt resistance means: biasing means)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Heiji Kato 2-36-2 Nobi, Yokosuka City, Kanagawa Prefecture (72) Inventor Wayne Russell Australia New South Wales North Wollongong Zips Street 22 Unit 13

Claims (7)

[Claims] 1. A pair of substantially horizontal casting rolls (1) forming a roll gap (2) therebetween, and molten metal is supplied to the roll gap (2) and supported by the casting rolls (1). A metal supply means (3) (4) (5) for forming a casting pool (6) for molten metal and a side defining closure of the casting pool (6) by sliding engagement with the end face of the casting roll (1). A pair of side dams (18) to be formed and a driving means (1) for rotating the casting roll (1) in the mutual direction to produce a solidified metal strip (19) fed downward from the roll gap (2).
0), a pair of plate holders (25) for holding the respective side dams (18), and a pair of inward closing forces capable of applying an opposing inward closing force to the respective side dams (18). A thruster (21) acting substantially horizontally, and the thruster (21) is pivotally connected to each of the plate holders (25) one by one via a pivot connection part (26) (28). Plate holder (2) in the roll longitudinal direction about the horizontal axis of
5) In a twin roll casting apparatus for metal strip casting, wherein the side dam plate (18) can be automatically aligned with the end face of the casting roll (1) by the tilting, the tilting of the plate holder (25) is performed. Tilt resistance means (4
A twin-roll casting apparatus for metal strip casting, wherein 1) is provided. The tilt resistance means (41) is connected to a plate holder (2).
2. The metal according to claim 1, wherein said metal member is constituted by a biasing means which acts on 5) to bias the plate holder (25) to a position at an angle with respect to a horizontal axis in a lateral direction of the roll which forms a tilt center of the plate holder. Twin roll casting equipment for strip casting. 3. A thruster (21) comprising a pair of pressure fluid piston cylinder units (22).
Or a twin roll casting apparatus for metal strip casting according to 2. 4. A thruster body (29) which is acted on by a pressure fluid piston cylinder unit (22) and is pivotally connected to a plate holder (25) via pivot connections (26) (28). The twin-roll casting apparatus for metal strip casting according to claim 3, comprising: 5. The plate holder (25), wherein the biasing means (41) is provided.
5. The twin-roll casting machine for metal strip casting according to claim 4, wherein the device comprises a spring means acting between the thruster body and the thruster body. 6. The twin-roll casting apparatus for casting metal strip according to claim 5, wherein the spring means comprises two pairs of compression coil springs (41), each pair acting on a respective one of the plate holders (25). 7. The thruster body (29), wherein the pivot connection portions (26) and (28) are limited to a vertical pivot axis and a horizontal pivot axis that is perpendicular to the vertical pivot axis and extends laterally of the roll end. The twin-roll casting apparatus for metal strip casting according to any one of claims 1 to 6, wherein the plate holder (25) is pivotally connected with the plate holder (25) limited to pivot movement about the vertical pivot axis and the horizontal pivot axis.