DE1242803B - Cooled mold for horizontal continuous casting - Google Patents

Description

GERMAN PATENT OFFICE

German class: 31 b2 -11/04

EDITORIAL

Number: 1 242 803

File number: A 46213 VI a / 31 b2

1 242 803 filing date: June 4, 1964

Open date: June 22, 1967

The invention relates to a cooled mold for horizontal continuous casting, in particular for light metal.

In a known arrangement for continuous casting, in which the cooled mold is the molten Metal-containing container is connected upstream, is the strand facing wall of the container with a horizontal slot for the passage of the molten metal in the direction of the strand Mistake. This slot is offset downwards from the center of the mold.

The disadvantage of this known arrangement is that the flow of metal let into the mold from relatively large height impinges on the lower portion of the mold wall. This has glitches in the homogeneity of the cast strand, especially in the area of its surface.

The invention is accordingly based on the object of providing a mold of the type mentioned at the outset to train that an immediate start of solidification is achieved after the melt has entered the mold without disturbing the homogeneity of the strand. Nevertheless, cracks should form in the strand Security to be avoided.

According to the invention, this object is achieved by the melt in the lower section of the mold next to and parallel to its wall introducing guide element released.

Such an arrangement means that the melt becomes warm immediately after it has entered the mold withdrawn, so that the solidification begins early on the one hand and on the other hand more evenly over the Distributed mold height. The strand cast in this way therefore also has a homogeneous surface area Structure without cracks.

Since with horizontal continuous casting the contact of the melt or the strand with the lower mold section is more intimate than with the upper section, the heat dissipation is also greater there. There in the arrangement according to the invention, part of the heat is already withdrawn from the inflowing melt is, in contrast to the known arrangements, the upper mold part only needs one To provide lower cooling capacity, so that a uniform solidification over the entire cross-section is achieved.

The guide element is advantageously a plate delimiting the melting container on the mold side with one of the inner mold contour following and arranged in its lower section next to this Outlet slot. The bottom of this outflow slot can be with a slight distance to Cooled mold

for horizontal continuous casting

Applicant:

Aluminum Company of America,
Pittsburgh, Pa. (V. St. A.)

Representative:

Dr.-Ing. H. Ruschke and Dipl.-Ing. H. Agular,
Patent Attorneys, Munich 27, Pienzenauer Str. 2

Named as inventor:

Kenneth James Brondyke, Oakmont, Pa .;

Richard Tyndale Craig,

New Kensington, Pa. (V. St. A.)

Claimed priority:

V. St. of America of June 6, 1963 (286 033) -

Be arranged Kokillenwandung. This distance should preferably be one eighth of the inner mold diameter do not exceed. If the strength of the plate requires it, the slot can be cut into individual, be divided by webs separated sections. To achieve a laminar flow, the slot diverge towards the mold.

For the supply of a lubricant, radial lubricant grooves adjoining an annular channel can be used be provided on the side of the mold facing the container. Radial lubricant channels are known per se for vertical continuous casting. Annular channel and lubricant grooves can expediently be covered on the container side by a sealing ring.

The invention is explained in more detail below with reference to exemplary embodiments in the drawing.

F i g. 1 is a longitudinal section through an arrangement for horizontal continuous casting, in which the inventive Mold is used;

Fig. 2 shows, on an enlarged scale, a section through the lower portion of the mold;

F i g. 3 and 4 each show an embodiment of a plate serving as a guide element with an outflow slot.

709 607/433

Claims (7)

F i g. 1 shows a sectional side view of an arrangement for horizontal continuous casting in which the mold according to the invention is used. The melt 8 in a container 2 which, together with its inlet 4, is provided with a temperature-resistant lining 6, emerges through a slot 20 in a guide element 18 to the mold 10. In the embodiment according to FIG. 1, the guide element 18 is designed as a vertical wall that closes the container 2 in the mold direction. The material of the guide element 18 is also highly temperature-resistant and heat-insulating. For the casting of aluminum, it can consist of an asbestos silicate. The cross section of the slot 20 follows the shape of the mold 10 in its lower section, so that in this area its outflow opening is parallel to the inner wall 3 of the mold and in the vicinity thereof. As shown in FIG. 1 shows, the slot diverges to achieve a laminar flow towards the mold. The guide element 18 is screwed to the mold 10 by means of a ring 22, which in turn is held on a frame 12 via a carrier plate 26. The mold and guide element can be adjusted with one another and with respect to the carrier plate 26. In the upper area, the connecting gap is covered by an insulating plate 28 which is screwed onto the carrier plate 26 with a metal plate 30 connected to the container walls in between. In the embodiment according to FIG. 1, the mold 10 is water-cooled; the cooling water is fed to it through pipes 14. It arrives in an annular chamber 16, from where it arrives via bores 44 and a downstream smaller chamber 46 on the surface 52 of the strand 40 drawn off by rollers 54. The molten area at the end of the strand is denoted by 36 in FIG. F i g. 2 shows, on an enlarged scale, the section through the lower mold section. It is from FIG. 2 that the smaller chamber 46 fed by the bores 44 has outlet channels 50 in the direction of the strand surface, which for this purpose extend at an angle of 5 to 10 ° and are formed by a releasably attached cover ring 48. Chamber size and channel width can be changed by replacing the cover ring 48. To lubricate the strand in the mold, small radial grooves 60 are provided which are covered by a ring 32 and the dimensions of which are kept so small that the liquid metal cannot penetrate them. The grooves 60 are supplied with lubricant, which can be grease or oil, via an annular channel 34 and supply lines 58 connected to a lubricant source. If the mold has a circular passage, the slot 20 accordingly has a semicircular shape which can be slightly larger or smaller than 180 °. As can be seen from FIG. 3, such a semicircular slot can also be divided into individual slot sections 62 for stiffening purposes. A series of bores that close to one another is also conceivable. In order to produce a square strand, the slot can take the form shown in FIG. 4 have the shape shown, while with other polygonal cross-sections it can follow the respective shape in a corresponding manner. Patent claims: 1. Cooled mold for horizontal continuous casting, in particular for light metal, characterized by a guide element (18) introducing the melt into the lower section of the mold (10) next to and parallel to its wall (3). 2. Chill mold according to Claim 1, characterized in that the guide element is a plate (18) delimiting the melting container (2) on the chill mold side with one of the inner mold contour following and in its lower section next to this outflow slot (20) . 3. Mold according to claim 2, characterized in that the slot (20) next to the mold wall (3) lies within one eighth of the inner mold diameter. 4. Chill mold according to claim 2 or 3, characterized in that the slot (20) is divided into individual sections (62) separated by webs. 5. Mold according to one of claims 2 to 4, characterized in that the slot (20) diverges towards the mold (10). 6. Chill mold according to one of the preceding claims, characterized by radial lubricant grooves (60) adjoining an annular channel (34 ) on the side of the chill mold (10) facing the container (2). 7. Chill mold according to claim 6, characterized in that the annular channel (34) and lubricant grooves (60) are covered on the container side by a sealing ring (32) . Considered publications:
German Patent No. 892 230;
Austrian Patent No. 197 020;
U.S. Patent No. 2527545. 1 sheet of drawings 709 607/433 6.67 © Bundesdruckerei Berlin