DE1257367B - Floating plate as an insert for steel mill molds - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

B22d

German KL: 31 b2 - 7/10

Number: 1257 367

File number: P 37337 VI a / 31 b2

Filing date: July 28, 1965

Open date: December 28, 1967

When casting slabs or blocks in steelworks molds, one has hitherto used various methods tries to avoid the formation of cavities. So it is known that the molds with block molds or inserts to be provided from light, heat-insulating and in some cases also exothermic panels. Such However, the result of block mold inserts is often unsatisfactory, especially since they are difficult to close to the mold fasten are.

So-called floating plates, which are inserted into the molds, are also known for similar purposes will. The floating plate floats with the one poured in from below via the pouring funnel Melt and has the task of covering the rising liquid material in a thermally insulating manner prevent premature solidification. When the mold is completely filled, the melt initially begins to solidify in the mold, starting from the floating plate, so that the solidification of the riser last done.

In addition, it is known to use a bell, at least partially slow, instead of a floating plate to use burning materials in the mold, the special abutment in the upper area are assigned to the mold. The slow burning of this bell is said to be the ascending one Metal kept liquid in its upper area. Such a measure is disadvantageous in that When the bell floats up, an air cushion forms under the bell, which means that when the edge of the bell is touched capsizing is often unavoidable with the inner walls of the molds. Disadvantageous with a too slow combustion or a too fast floating is also that the air cushion below the bell does not fill the bell cavity with the metal allows. If the combustion takes place too quickly, shielding is required, particularly in the area of the end phase of the metal in the upper area of the molds is no longer given. - Have the familiar bells therefore not prevailed.

The invention is based on the object of providing floating plates of the type described above to improve in relation to the possible thermal insulation of the mold head.

The invention relates to a floating plate as an insert for steelworks molds with a stepped or conically drawn-in head. The invention consists in that the floating plate consists of a frame with an attached mold hood and an insert piece which is inserted into the frame and floats in the mold hood. To use the erfin swim plate as an insert for
Steel mill molds

Applicant:

Possehl ore agency

Company with limited liability,

Düsseldorf, Graf-Adolf-Platz 2-4

Named as inventor:

Dr.-Ing. Günther Wiesner, Essen

To be able to easily manipulate the swimming plate according to the invention with the hood is a proposal of the invention to make the arrangement so that the frame with the hood and possibly also the Insert are made in several parts. It - can be appropriate to the frame with a circumferential side to provide a circumferential stabilization collar, which stabilizes the floating.

In terms of materials, there are various possibilities within the scope of the invention. In particular there is the possibility in a known manner with corrugated cardboard that in some way is made incombustible to work. However, a preferred embodiment of the invention is thereby characterized in that the floating plate including hood and insert made of sawdust as well as a binding agent that makes the sawdust incombustible. A particular binder is used Water glass in question. The floating plate can also contain an additive of fine-grain minerals.

In order to facilitate the manipulation of the floating plate according to the invention, are expedient Transport hook inserted into the floating plate.

The advantages achieved by the invention are mainly to be seen in the fact that when used the floating plate according to the invention on the one hand fulfills the function that is usually performed by Floating plates is met, but in addition an additional thermal insulation is achieved, such as it is otherwise only realized through block mold inserts. Nevertheless, it is not necessary to fasten such inserts in a cumbersome manner in the mold. Rather, the hood floats with the floating swim plate and the

. 709 710/468

Claims (4)

rising melt into its functional position, as it were. Once it has reached this functional position, the melt continues to rise, taking with it the insert which, in conjunction with the hood, ensures the necessary thermal insulation despite its floating. Furthermore, owing to the structure according to the invention, capsizing is practically impossible and, in particular, the required functionality is guaranteed under all circumstances. In the following the invention is explained in more detail with reference to a drawing showing only one embodiment; it show F4 g. 1 shows a vertical section through a floating plate according to the invention in the functional position in a steelworks mold, _. . _ F i g. 2 a plan view of the floating plate according to Fig.l. The floating plate 1 shown in the figures is intended for steel mills 2, specifically for those with a stepped or conically retracted head 3. The floating plate itself consists of a frame 4 with an attached mold hood 5 and a floating plate inserted into the frame 4 and floating in the mold hoodS Insert 6. In the exemplary embodiment, the frame 4 and hood 5 and also the insert 6 are made in one piece. But there is also the possibility of designing these elements in several parts and putting them together in the mold. In the case of a multi-part embodiment, the introduction of the elements into the mold 2 is evidently easier. In addition, lifting eyes 7 or supporting hooks can be provided on the elements in order to further facilitate manipulation. In the figures it can be seen that the frame 4 expediently has a stabilizing collar 8 protruding downward on the circumference. This ensures that the floating plate 1 is straight. 4 floats and consequently the hood 5 reaches the prescribed functional position, which is shown in FIG. 1 has been indicated. The floating plate 1 shown consists, for example, of sawdust and of a binding agent which makes the sawdust incombustible; water glass in particular is suitable as such. An addition of fine-grain minerals can be provided. In addition, the floating plate 1 can be provided in the region of its edge 9 with an embedding 10 of paint or casting powder. Then there is no need to paint the mold 2 first or to add casting powder in addition. Patent claims: 1. Floating plate for steelworks molds with a stepped or conically retracted head, characterized in that it consists of a frame (4) with an attached mold hood (5) and an insert piece (6) inserted into the frame (4) and floating in the mold hood (5) consists. 2. Floating plate according to claim 1, characterized in that the frame (4) with hood (5) and optionally also the insert (6) are made in several parts. 3. Swimming plate according to claim 1 and 2, characterized in that the frame (4) has a circumferentially encircling stabilizing collar (8) . 4. floating plate according to claims 1 to 3, characterized in that it is made of sawdust as well as a binding agent that makes the sawdust incombustible, such as water glass, an addition of fine-grained minerals can be provided. Considered publications:
Austrian patent specification No. 146 217. 1 sheet of drawings 709 710/468 12.67 © Bundesdruckerei Berlin