JPH0318459A - Manufacture of metal rapidly cooled strip having excellent shape at edge faces - Google Patents

Abstract

PURPOSE:To manufacture metal rapidly cooled strip having excellent shape at edge faces by restraining growth of solidified shell at both edge faces of roll containing contact point with side dams on either one side of the cooling roll surface. CONSTITUTION:In order to delay the solidification of molten metal of the position in contact with both edge part surface of the cooling roll, to both edges of one side of the cooling roll, thermal-spraying 6 of ceramic is executed or lubricant 7 having small heat conductivity is applied by using cylinders 8a, 8b. As the other way, in space formed by coming the rolls 1a, 1b into contact with the side dams 3, the ceramic is poured and pushed to the one side of the cooling roll 1b by using the cylinders 8a, 8b. By these method, the growth of solidified shell at either one side of the cooling roll 1b surface, particularly, at both edge faces of roll containing the contact point with the side dams 3 is suppressed. By this method, penetration of the molten metal at strip edges is not developed and the metal rapidly cooled strip having excellent shape at edge faces can be stably manufactured for a long time.

Description

Detailed Description of the Invention Industrial field in Icheon The present invention relates to a method for producing a quenched metal thin JIF having an excellent end face shape, and in particular to a method for producing a quenched metal ribbon using a twin roll method. This is an attempt to improve the end face shape of 4jF. Conventional technology> Conventionally, as shown in Japanese Patent Application Laid-open No. 60-30556, a device for continuously casting thin plates from molten metal such as molten steel has been used, as shown in FIG. a pair of adjacent cooling rolls la, 1b and a drive means (not shown) for rotating the pair of cooling rolls Ia, Ib in opposite directions at the same circumferential speed; and a pair of cooling rolls la, A pair of side guides (or end pressers, fixed Ill) 3a. 3b is known. The above-mentioned continuous forming device for thin plates has the following two problems. That is, the solidified shell that has grown and adhered to the inner surface of the fixed side guides 3a and 3b gets into between the cooling rolls la and lb, resulting in abnormal pressure and causing troubles such as temporary breakage, and the fixed side guides 3a and 3b and the cooling rolls. The molten metal enters between the end face of the cooling roll and the side guides 3a and 3b due to the axial vibration and rattling of the roll, and is molten metal.
In addition to impeding the smooth rotation of the thin coil, it also deteriorates the shape of the end of the manufactured thin coil, making it impossible to continuously wind it into a coil. On the other hand, JP-A-63-126646, JP-A-63-12
6647 and JP-A No. 63-112047, a side dam made of refractory material with high lubricity such as graphite is used;
-677156, etc., the side dam is plasma,
We are trying to prevent the above problems by heating with high frequency. However, in order to prevent the solidified shell from forming on the side dam, it is necessary to heat the molten metal to near its melting point, but since the side dam is in contact with the cooling roll, heat is taken away by the roll, and the temperature rise is below 1000°C. All I can do is warm. Therefore, the formation of a solidified shell cannot be avoided, and the solidified shell oozes out due to the pressure reduction at the roll kissing part, which causes abrasion of the side dam and a reaction force on the side dam, increasing the gap between the roll end face and the side dam, thereby preventing hot water boiling problems. difficult. This invention tries to solve i! l! Problem: In the conventional method described above, since the side dam is pressed against and in contact with the roll, there is a limit to the heating of the side dam, and wear and tear occurs.

For this reason, the formation of solidified shells and the occurrence of boiling water are inevitable.
Rolling troubles occurred due to temporary breakage and deterioration of the shape of the edges of the produced usuki, making it impossible to continue casting in large quantities. The present invention has been made in order to advantageously solve the above-mentioned problems, and to provide a method for manufacturing quenched metal thin film 1, which can stably obtain a quenched ribbon with a good end face shape over a long period of time. It is something. <Means for Solving the Problems> The present invention involves continuously supplying molten metal to a pair of cooling rolls rotating at high speed, and using the cooling rolls and side dams disposed opposite to each other on the end faces of the cooling rolls to cool the molten metal. hold,
In a method for producing a metal quenched ribbon by rapid solidification,
Metal quenching thin film 4 with an excellent end face shape, which is specially designed to delay the solidification of the melt field in contact with the surfaces of both ends of the cooling roll, including the area in contact with the side dam of one of the cooling rolls.
This is a method for producing tF. <Function> The present invention continuously supplies molten metal from the iJL feed nozzle to the roll kissing portion of a pair of cooling rolls rotating at high speed, and the molten metal at the roll kissing portion is transferred to the roll end face of the cooling roll including the kissing portion. When producing a metal ribbon by holding it with a side dam placed opposite to it and rapidly solidifying it, the growth of a solidified shell on both edge surfaces of the roll, including the contact point with the side dam on either cooling roll surface, is prevented. This is a method for manufacturing quenched metal ribbons with excellent end-face shape by suppressing the thickness. The method for manufacturing the quenched metal ribbon according to the present invention will be explained with reference to FIG. In Fig. 2(a), ceramic spraying 6 is applied to both ends of one cooling roll, and the type or thickness of the spraying layer 6 is, for example, tungsten carbide (WC) as disclosed in JP-A-59-163056. , Chromium carbide (
A sprayed coating with a thickness of 0.05 to 0.17 mm is applied to a thickness of O. OS ~ 0.3 It is best to coat the Ni coating on the RAM base. For example, a width of 5 to 20 m is effective. The thicker the heat insulating layer, the better because it can suppress the growth of the solidified shell, but since it cannot withstand thermal stress caused by the heat from molten steel, the maximum thickness was set to (1.17 mm.Ni
The same reason is why mefuki is used as a base. The minimum thickness of 0.05 mm was determined from the viewpoints of both processing and wear resistance. Ceramink is not limited to the above-mentioned WC, Cr3Cz, and includes, for example, [tN, SiJa, Sialon eL]
C is also fine. In FIG. 2(b), a lubricant 7 with low thermal conductivity, such as rapeseed oil, heat-resistant grease, 11 is applied to both ends of one cooling roll lb.
．． 5, BN, etc. is applied by pressing using cylinder 8. FIG. 2(C) shows a ceramic material such as [IN,
A heat-resistant block 9 such as SiJa or Sa.f-Aron is injected and pressed against one cooling roll lb using a cylinder 8. In this way, by the method shown in FIGS. 2(a), (b), and (C), the two wooden cooling rolls 1
This suppresses the length of the solidified shell on either side of the cooling roll lb surface of the alb, especially on both edge surfaces of the cooling roll including the contact point with the side dam 3, and prevents the solidified shell near the final solidification position at the roll kiss part. As shown in the figure, the solidification lag part IO absorbs the rolling and its width expansion to prevent the solidification shell from adhering to the side dam 3 and from pouring into the gap between the side dam 3 and the end faces of the cooling rolls la and lb. can. Embodiment> FIG. 2(a) above. (b). Using the method shown in (C), a thin ribbon was prototyped using the twin roll method under the following conditions.
Copper roll: outer diameter 550mm. Cap 500mm, roll peripheral speed: 2. lm/SEIC+Side dam: Copper press internal water cooling system, Roll pressure: ILon+ Steel type: SUS304, ? 8 Steel temperature: 1600°C Heat size: 3 ton, By delaying the solidification of one cooling roll,
a), (b). Using the method of (c), a long metal rectangular cold thin 4'' with an excellent sharp edge shape without the need for scalding at the plate edge was stably manufactured and rolled. On the other hand, when the present invention is not implemented and only the conventional pressing type shown in Fig. 3 is used, when the heat size is 500 kg, temporary edge climbing and dog bones occur due to hot water on the side dam, and winding cannot be performed normally, resulting in breakage within the line. This caused a problem. In addition, the obtained thin metal sheet has a poor shape and has many cracks even from the temporary edges, so it cannot be used as a product. <Effects of the Invention> According to the method of the present invention, when producing quenched thin 1F by the twin roll method, a quenched metal ribbon with an excellent end face shape can be stably produced for a long time without the need for pouring at a temporary edge. be able to.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the method of the present invention, (a) is a plan view, (b) is a sectional view taken along line A-A in (a), and (C) is a B-B in (a).
-B sectional view, Figure 2 (a), (b). (C) is a perspective view explaining the method of the present invention, and (d) is a C-
FIG. 3 is an explanatory diagram of a conventional twin-roll bag ribbon manufacturing apparatus, in which (a) is a side view and (b) is a plan view. ...Cold n1 roll, ...Nide dam, ...Molten metal, ...Lubricant, ...Insulating bronc, 2...Nozzle, 4...Thin shear, 6...Ceraminoku 7 injection, 8...Press cylinder 10...Solidification delay portion. Figure 1 (σ) (b) (C)

Claims (1)

[Claims] The molten metal is continuously supplied to a pair of cooling rolls rotating at high speed, and the molten metal is held by the cooling roll and a side dam placed opposite to the end face of the cooling roll, and the molten metal is rapidly solidified to produce a quenched metal ribbon. A method for producing a quenched metal ribbon having an excellent end surface shape, the method comprising: delaying the solidification of molten metal in contact with the surfaces of both ends of a cooling roll, including a portion in contact with a side dam of one of the cooling rolls.