JPH01245946A - Apparatus for producing rapid cooled metal strip - Google Patents

Abstract

PURPOSE:To improve the quality of a product by stripping solidified material developed on a strip with grooves having sharp edges formed along outer circumferential edge of a cooling roll at inner face side of end side wall abutting on cooling rolls while sliding. CONSTITUTION:At the inner face side of the end side wall 2 abutting on the cooling rolls 1 while sliding, the end side grooves 6 along the outer circumferential edge 1a of the cooling roll from the upper end face 2a are arranged. The end side grooves 6 are slopedly opened as straight line toward lower end direction of the cooling rolls, and stripping part 8 of the solidified material is formed at this position. In the stripping part 8, knife-edge part is formed to flowing surface of the strip 9 and constituted so as to position the upper end of the stripping part 8 at upper part from the lower end of the end side wall 2. By this method, penetrating solidified material 4 developing at end part of the strip is effectively stripped, and the quality can be improved.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is directed to the production of metal ribbons by pouring molten metal into a casting space formed by a pair of cooling rolls and an end wall. The present invention relates to a quenched metal ribbon manufacturing apparatus having end walls that allow the melted solidified material to escape easily.

<Prior art> In a quenched ribbon manufacturing apparatus using the twin roll method, a pouring nozzle (
A technique is well known in which an end wall 2 is provided to prevent the molten metal 3 from flowing out from the end of the cooling roll 1 when the molten metal 3 is poured from the path shown in the figure.

<Problem to be solved by the invention> That is, JP-A-60-162557, JP-A-60-1
No. 62558, Japanese Unexamined Utility Model No. 82448, No. 62448, Japanese Unexamined Patent Publication No. 62448
1-172656, the end surface of the cooling roll l is thermally deformed during casting as shown in FIG. 6, as shown in FIG.
The sealing performance at the end wall 2 deteriorates, and blistering occurs between the end wall and the end face of the roll, which solidifies and forms a solidified material 4 on the edge of the ribbon 5.
adheres and deteriorates the ribbon edge shape.

Furthermore, the solidified material 4 attached to the edge becomes threading resistance,
Ribbon breakage also occurs. This phenomenon was reported in Japanese Unexamined Patent Publication No. 58-1885.
This phenomenon also occurs in the movable end walls proposed in No. 48 and JP-A-58-188549. Also, JP-A-60-1
No. 2260, a method has been proposed in which gas is injected from the end wall to prevent molten metal from being inserted between the cooling roll and the end wall. This disturbs the water pool in between, leading to deterioration of the ribbon shape.

A technique for forming grooves on the end walls is disclosed in JP-A-60-184451, but since no grooves are provided in the sliding portion between the cooling roll end face and the end wall, the plate-like The same phenomenon occurs as for edge walls.

As mentioned above, when a ribbon is cast by pressing a plate-shaped end wall against the end face of a cooling roll, the cooling roll is thermally deformed, and molten metal is inserted between the end face of the roll and the end wall, and this solidifies. Then, it leaves the cooling roll while remaining attached to the edge of the ribbon.

At this time, the solidified material enlarges the gap between the end wall surface and the end face of the roll, deteriorates the shape of the ribbon edge, and furthermore, the solidified material attached to the ribbon edge acts as a resistance to threading, causing the ribbon to break.

Method of pressing the end wall 2 against the work surface of the cooling roll 1 (
(see FIG. 7), but with this method, the plate thickness cannot be changed and the roll work surface is also thermally deformed, resulting in the same problems as the above-mentioned end face pressing type end wall.

The present invention solves the above-mentioned conventional problems and eliminates the molten metal solidified material that is generated when manufacturing a metal ribbon by pouring molten metal into a casting space formed by a pair of cooling rolls and an end wall. The object of the present invention is to provide a quenched metal ribbon manufacturing apparatus that can be easily separated and removed.

<Means for Solving the Problems> The quenched metal ribbon manufacturing apparatus of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, a quenched metal ribbon manufacturing apparatus is comprised of a pair of cooling rolls 1 that rotate at high speed, and end walls 2 disposed in contact with both end surfaces of the rolls 1, respectively.
In the sliding surface where the cooling roll 1 and the end wall 2 come into contact, the inner surface of the end wall 2 is inclined downward from the upper end surface 2a to the lower part along the outer peripheral edge 1a of the cooling roll 1. It is characterized in that an edge groove 6 is provided that communicates with the side end surface 2b, and the lower end is used as a stripping section 8 for the coagulated material.

As mentioned above, in the present invention, in order to press the end face of a plate-shaped roll, end grooves 6 as shown in FIG. It is located within the sliding surface of.

The coagulum stripping section 8 has an acute angle like a knife with respect to the flow surface of the thin plate 9, but the upper end of the stripping section 8 needs to be positioned above the kiss section at the lower end by an amount D. When the radius of the cooling roll 1 is R, D is D-α・R (0,005≦α
≦0.01).

The reason for this is that when α
If >0.01, an unsolidified portion will exist, and molten water will occur between the end wall 2 and the end surface of the cooling roll 1 below the end groove 6, resulting in no effect.

The depth shape of the edge groove 6 may be U-shaped as shown in FIG. It is desirable to have a tapered shape.

Furthermore, the upper end of the stripping section 8 may be set at θ-90'' with respect to the surface of the water-cooled roll l as shown in Fig. 1, but it is better to set θ<90° as shown in Fig. 3. The peelability is good (and since the peeling part 8 requires hardness and strength, the material of only this part may be changed).

Effect> By the above means, the present invention provides cooling roll 1 rotating at high speed.
When manufacturing a ribbon by pouring molten metal 3 into the casting space formed by the end wall 2 and the end wall 2, the molten metal 3 is inserted into the end groove 6 of the end wall 2. At the stripping section 8 shown in the figure, the solidified material inserted on the end surface of the cooling roll 1 is stripped off from the edge of the ribbon, passes through the groove as shown by the arrow, and is removed, and then exits from the kissing section at the lower end of the cooling roll 1. The edges of the coming thin strip are sharp.

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

The roll dimensions of cooling roll 1 are φ550 x width SOO.

At a roll peripheral speed of 2.5 m/s and a pouring speed of 4.0 kg/s, the end wall 2 having the shape shown in Fig. 1 (groove depth 2 mm, Dm 4 am, end side length 170 m, end side thickness 30 mm) was formed. Use, 4.
5% 5i-Fe was cast.

As a result, as shown in FIG. 4, the edges of the ribbon 5 were sharp without adhesion of coagulum, and the success rate of continuous casting of 7 or more was 80%. In addition, in the case of the grooved end wall with D=20aas, as shown in FIG. Adhesion of coagulum 4 occurred. Further, in the case of D-1 mm, the peeled-off part 8 was damaged at the point when 1.5 mm was cast, and the effect was lost.

For comparison, when casting was performed using an end wall without an end groove, as shown in Fig. 5, the solidified material 4 from the hot water bath adhered to the edge of the ribbon 5, and it was possible to successively cast more than 1 material. rate is 2
The score was around 0%, which was an extremely poor result.

<Effects of the Invention> As explained above, when the quenched metal ribbon manufacturing apparatus with the end wall structure of the present invention is used, the boiled solidified material produced between the end wall and the end face of the cooling roll can be separated from the ribbon. This makes it possible to continuously cast thin strips with sharp edges, which has a great effect.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the end wall of the present invention with the outer peripheral edge of the cooling roll indicated by dotted lines, FIG. 2 is a plan view showing the quenched ribbon manufacturing apparatus of the present invention, and FIG. 4 is an explanatory diagram showing the state of the ribbon manufactured according to the present invention; FIG. 5 is an explanatory diagram showing the state of the ribbon manufactured according to the comparative example and the conventional example; FIG. 6 is a side view of a conventional example in which the end walls are shown by chain lines, and FIG. 7 is a perspective view of another conventional example. DESCRIPTION OF SYMBOLS 1... Cooling roll, la... Outer peripheral edge of the cooling roll, 2... End wall, 3... Molten metal, 4... Bottle and its solidified product, 5... Thin ribbon , 6... Edge groove, 7... Direction of flow of the hot water sink and its coagulated material, 8... Coagulated material stripping section, 9... Threading direction of the thin strip. Patent Applicant: Kawasaki Steel Corporation Figure 1 Kazu Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] In a quenched metal ribbon manufacturing apparatus comprising a pair of cooling rolls that rotate at high speed and end walls disposed in contact with both end faces of the pair of cooling rolls, the cooling rolls and end walls are An end groove is provided on the inner surface of the end wall in the sliding surface in contact with the cooling roll, from the upper end surface along the outer peripheral edge of the cooling roll, sloping downward at the lower part and communicating with the side end surface. A quenched metal ribbon manufacturing device characterized by having a peeling section.