DE3538448A1 - Continuous casting mould for the production of cast strip, having a casting drum and a revolving covering belt - Google Patents

Abstract

In a continuous casting mould comprising a casting drum 1 and a revolving covering belt 2 and having a storage device 5, a float for the maintenance of a constant level of molten metal, and nozzles 6a, 6b for spraying the revolving casting groove U or the surface of the covering belt 2 which faces the latter, a deflection pulley 3 for the covering belt 2, the said pulley being arranged in a fixed location in the region of a pour-in opening V, is pressed on, with the interposition of the covering belt, directly at the vertex of the casting drum 1 provided with the casting groove U. The ratio of the width F of the casting groove U to the depth J is approximately equal to or less than 9:1, the base area being divided in the axial direction into a row of annular sections F" of width G and being equipped with a base which is arcuate in an axial plane. The depth I and the radius R of the arcuate base are in the following ratio: depth J to depth I approximately equal to 24:1, width G to radius R approximately 1.5:1 and width F to width G approximately 125:1. <IMAGE>

Description

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HOFFNMWN · EITLE & PARTNER.

PATENT AND LAWYERS O b 3 ö 4 4 Q

PATENTANWÄLTE WERNER EITLE, DIPL.-INQ. · KLAUS HOFFMANN, DR., DIPL.-INQ. . WERNER LEHN, DIPL.-lNG.

KLAUS FOCHSLE, DIPL.-INQ. · BERND HANSEN, DR., DIPL.-CHEM. . HANS-A. BRAUNS, DR., DIPL.-CHEM. · KLAUS SORG, DIPL.-INQ. KARL KOHLMANN, D1PL.-ING. · HELGA KOLB, DR., DIPL.-CHEM. · BERNHARD VON FISCHERN, DIPL.-lNG.

LAWYER ALEXANDER NETTE

UNIAL - Tovarana glinice in aluminija "BORIS KIDRIC" n. Sub. O. KIDRICEVO / Yugoslavia

Continuous casting mold for the production of strip casting, with a casting drum and a circumferential cover band

The present invention relates to a continuous casting mold for the production of strip cast, with a casting drum, a circumferential shroud, a storage device with a float to maintain a constant molten metal level, as well as with nozzles for spraying the circumferential pouring channel or the strip surface facing this of the cover band. -

The invention relates to the field of casting of metals, in particular to the field of machines for carrying out particular ones Casting processes, including the continuous casting of metals, i.e. casting in unlimited lengths.

A continuous casting machine with a casting drum for producing a non-iron strip casting is known, in which the four pulleys of the revolving cover strip are placed on the pouring point the machine, i.e. above the apex of the casting drum, arranged deflection roller at a distance from the casting, drum is arranged so that the guided by this in the tangential direction to the casting drum encircling shroud with the latter includes a pouring spout which is about a substantial amount with respect to the apex of the pouring drum Angle is shifted in the direction of rotation of the casting drum.

Along the outer surface of the casting drum is a casting trough with a trapezoidal cross-section with straight sides.

POST BOX 8104 20 ARABELLASTRASSE 4 / VIII ΘΟ00 MUNICH Θ1 TELEPHONE: CO 893 911086-89 TELEX: 529619 CPATHEJ TELEFAX: O89 / 918356 CSR II + W) TELETEX: 89 72 41

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cut. With the cross-section of this pouring channel, the cross-section of the cast strip is determined in which the ratio of width to thickness of the cast strip is about 10.

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In the operation of the known casting drum, in which the pouring spout is arranged as described and which has a dimensional ratio has the casting channel as indicated above, it happens that in the cross section of the strip casting directly after casting, there are at least three sections in which the solidification of the metal melt slower than in the other areas of this cross-section takes place. This fact leads to excessively high internal levels Tensions in the cast, due to which the latter cracks in the longitudinal and transverse directions.

The invention is based on the object ein.Stranggießkokille to develop the above-mentioned genus in such a way that the solidification of the cast strand, possibly one Band, takes place optimally, i.e. that in the cross-section of the band a single, slowly solidifying area that extends lengthways of the belt extends relatively far, is achieved.

This object is achieved according to the invention in that a deflection roller of the cover strip, which is fixedly arranged in the area of a pouring spout (V), with the cover strip interposed, directly on the apex section of the casting drum is pressed, which is provided with a pouring channel (U) whose ratio of width (F) to depth (J) is equal to or less than G and whose bottom area is in the axial direction is subdivided into a series of ring sections (F ") of width (G) with a bottom which is curved in the axial plane of depth (I) and radius (R) in a ratio of depth (J) to depth (I) equal to about 24, a ratio width (G) to radius (R) about 1.2 and a ratio of width (F) to width (G) equal to about 125.

The invention is based on the premise that the The size of the cross section of the strip casting in absolute terms is not changed compared to the prior art. Under this premise is transformed into the problem mentioned above in the problem of heat dissipation delay and compensate in the cross section of the band.

To achieve this z-u, one can either use the location of the The pouring mouth or the cross-section of the strip casting vary, taking into account the geometrical laws, that for a given area of a figure its outline is smallest when a circle is in question, and / or with the influence of the coating on the surfaces with which the molten metal comes into contact, under the The prerequisite for sticking to conventional layers.

In the case of the continuous casting mold according to the invention, the top-side deflection roller of the shroud is the continuous casting mold moved up to the outer surface of the casting drum, whereby the wedge-shaped pouring mouth is eliminated. This is has been replaced according to the invention by a pouring trough or a pouring device constructed for this purpose, and the cover band thus comes into contact with the latter essentially already in the apex area of the casting drum.

The ratio of width to thickness of the cast strip is to a value lower than 10, according to the invention to 9 or less reduced.

According to the invention, it was surprisingly found that that the influence of the coating is significantly improved when the bottom surface of the casting trough of the casting drum in ring sections is divided, each having an arcuate bottom in an axial plane, with all ring sections are preferably mutually equal.

It has been found that as a result of the above

given measures in the cross section of the strip casting single, central, maintained along the fabricated strip on a substantial portion of the circumference of the casting drum there is a softer area of the band, in which the internal tensions are optimally balanced.

The invention is explained in more detail below with reference to an exemplary embodiment shown in the drawing. It shows:

Fig. 1 shows a machine for casting the strip (or wire) as a whole in side view;

FIG. 2 shows a detail of the pouring area of the machine from FIG. 1;

•] q Fig. 3 shows a casting drum of the machine from Fig. 1 in axial section, partially cut off, and FIG. 4 shows detail IV from FIG. 3.

About a stationary, rotating casting drum 1, which is a base part of the mold for the continuous casting of a Tape T represents, as can be seen from Figure 1, a steel cover tape 2 is laid, which is guided, stretched and is driven. The shroud represents a second part of the rotating mold. One in the pouring area of the The pulley 3 of the shroud 2 located in the machine is essentially attached to the casting drum 1 together with the latter moved in the apex area, where they are in connection with a circumferential casting channel U of the casting drum 1 forms a pouring mouth V. In this is a corresponding to the dimensions and the shape of the pouring mouth V fitted trough 4 of a storage device 5, which, as can be seen from Figure 2, to maintain a constant molten metal level is equipped with a float.

In Figure 1 is also a nozzle 6a for spraying the casting channel U and a further nozzle 6b for spraying the Shroud 2 shown with a size.

35Fig. 3 shows the casting channel U of the casting drum 1 with the width F and depth J, for which the ratio F: J ^ = 9 applies. A detail of the bottom surface of the launder U is

shown in Figure 4, from which it can be seen that the width F 'of the bottom surface of the casting channel U in a row of ring sections F ″ with the width G and each with an arcuate bottom of the depth I and in the axial plane of the radius R is divided, the following ratios being chosen: J: I about 24, G: R about 1.5 and Q: G about 125.

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Claims (1)

HOFFMiANN · Er ~ r _L .E & PARTNER PATENT AND LAWYERS '353844S PATENTANWÄLTE WERNER EITLE, DIPL.-ING. ■ KLAUS HOFFMANN, DR., DIPL.-ING. · WERNER LEHN, DIPL.-ING. KLAUS FÜCHSLE, DIPL.-ING. · BERND HANSEN, DR., DIPL.-CHEM. · HANS-A. BRAUNS, DR., DIPL.-CHEM. · KLAUS SDRe, DIPL ₁ -INe. KARL KOHLMANN, DIPL.-ING. · HELGA KOLB, DR., DIPL.-CHEM. ■ BERNHARD VON FISCHERN, DIPL.-ING. LAWYER ALEXANDER NETTE UNIAL - Tovarna glinice in aluminija "BORIS KIDRIC" n.sub.ο. KIDRICEVO / Yugoslavia Continuous casting mold for the production of strip casting, with a Casting drum and a circumferential shroud ^4th Claim Continuous casting mold for the production of strip casting, with a casting drum, a revolving shroud, a storage device with a float for maintaining a constant molten metal level, as well as with nozzles for spraying the circumferential pouring channel or to this pointing band surface of the shroud, thereby g e k e η η ζ e i cn η e t that one in the area of a pouring mouth (V) fixedly arranged deflection roller (3) of the cover tape (2) with the interposition of the cover tape directly is pressed against the apex section of the casting drum (1), which is provided with a casting channel (U), whose ratio of width (F) to depth (J) is equal to or smaller G "and its bottom surface in the axial direction in a series of ring sections (F") of width (G) is divided with an arcuate in the axial plane Bottom of depth (I) and radius (R) in a ratio of depth (J) to depth (I) equal to about 24, one Ratio of width (G) to radius (R) about 1.2 and a ratio of width (F) to width (G) equal to about 20th POST BOX 81O4 20 ■ ARABELLASTRASSE 4 / VIII ■ 8000 MÖNCHEN 81 TELEPHONE: COB93 911086 ^ 89 · TELEX: 529619 CPATHEJ · TELEFAX: 089/918356 CGR 11+ 110 · TELETEX: 897241 CPATHE}