DE1092167B - Shaped bodies for lining blocks or molds - Google Patents

Description

To avoid the disadvantages of uneven cooling of the metal poured into a block mold, it is common to use refractory bricks for thermal insulation, which have a low thermal conductivity own. With these stones either the head part of the block shape or separate ones are made the block form lined hoods. It has long been known that the density of in such Forms cast blocks and the block yield can be increased if the refractory Stones are preheated before the block is poured. It has also been tried in place from merely insulating stones to stones or other shaped bodies, such as sockets, made of exothermic substances use, which when in contact with the liquid metal result in a heat-generating reaction, whereby the cooling of the adjacent parts of the cast block is delayed. Exothermic mixtures, which can be used in this way are well known.

It has also already been proposed that molded bodies be used for lining block or casting mold attachments to use, which consists of an inner layer of exothermic mass facing the metal and an outer layer facing away from the metal consist of heat-insulating, refractory material; through this outer layer should be achieved that the heat transfer from the exothermic Mass on the walls of the casting mold or the casting mold attachment and thus the heat loss on a The minimum remains limited. In a special embodiment of such composite moldings, the exothermic mass in a recess consisting of the heat-insulating refractory material Layer attached in which it extends in a strip shape transversely from one side to the other. If two such shaped bodies are placed against one another when they are in use, one occurs lateral contact of the exothermic mass.

But it has been found that composed of exothermic and insulating refractory masses Stones show certain disadvantages in practical operation. So are bound exothermic masses of significantly lower strength than the normal refractory insulating bricks that are used in block production be used; the exothermic coating of these composite stones can also occur when inserted into a casting hood or crumble into a grooved block shape, whereby parts of the exothermic mass in the block shape which can lead to inclusions in the finished block. In addition, the abrasion of two adjacent Stones when placed in a pouring hood or in a fluted block form for formation of a gap between these stones lead into the

Shaped bodies for lining block or casting mold attachments

Applicant: Foundry Services Limited,

Nechells, Birmingham, and John Knowles & Co. (Wooden Box)

Limited,

Woodville, Burton-on-Trent (UK)

Representative: Dr.-Ing. G. Eichenberg

and Dipl.-Ing. H. Sauerland, patent attorneys,

Düsseldorf, Cecilienallee 76

Claimed priority: Great Britain April 5, 1956

Robert Charles Edmonds, Nechells, Birmingham, and Alan Keyworth, Sheffield (Great Britain),

have been named as inventors

liquid metal can then penetrate during casting, which increases the risk of shrinkage being impeded of the block and thus the formation of heat cracks or cracks in the finished block. In order to reduce or eliminate these disadvantages, the invention provides for a molded body for the lining of block or casting mold attachments with a metal facing away, outer layer made of heat-insulating, fireproof material and an inner layer facing the metal Layer of exothermic mass this mass on at least two side surfaces of the molded body of edging strip-like protruding edges made of heat-insulating, refractory material, so that a Contact between the exothermic masses of adjacent shaped bodies is avoided.

The insulating material is preferably in the form of a four-sided stone with two standing upwards opposite sides, the exothermic mass then being introduced into the channel formed in the stone will. The shaped body can also consist of a four-sided refractory brick with four upwards standing edges and the one attached and preferably wedged in the recess formed in this way exothermic material. It is very purposeful

009 630/343

Claims (2)

moderate to use grooved stones in which the exothermic mass can be easily shaped and then dried therein. Such stones can have recesses in the shape of a dovetail or groove or the like on their edges in order to mechanically clamp the exothermic mass with the stone. As a result, when the stones are inserted into the casting hood or into the grooved casting mold, only the hard side surfaces of the refractory material come into contact with one another, so that there is no risk of the exothermic mass being worn off. If only one layer of bricks is required, the heat-insulating refractory material need only be channel-shaped and laid in such a way that the channels are perpendicular so that the exothermic mass reaches up to the upper and lower end faces of the bricks. When using several stone layers, on the other hand, it is desirable to form all of the side edges of refractory material. Embodiments of the subject matter of the invention are shown in FIGS. 1 to 5, which show perspective block shapes, of which FIG. 1 illustrates a block that is inclined on all sides, the refractory part 10 of which has a dovetail-shaped channel for receiving the exothermic mass 11, and FIG. 2 one that is inclined at its ends Stone, the refractory part 12 of which has a channel with an inverted T-shaped cross-section for receiving the exothermic mass 13, FIG Another dovetail-shaped part accommodates the exothermic mass 16, FIG. 4 shows a triplex brick with a curved surface, the refractory part 17 having a channel with an inverted T-shaped cross-section into which a highly insulating material 18 and an exothermic mass with groove-shaped parts 20 are introduced Fig. 5 shows a flat fluted stone v on rectangular shape in which the refractory part 21 forms all four sides of the stone, a recess in the front surface of the stone is filled with exothermic mass and a wax paper 23 is attached over the entire front surface to protect the exothermic mass during storage. 1. Shaped body for lining block or casting mold attachments with a metal facing away, outer layer of heat-insulating refractory material and an inner layer of exothermic material facing the metal Material, characterized in that the exothermic material on at least two side surfaces of the molded body of strip-like protruding edges made of heat-insulating, refractory material is bordered. 2. Shaped body according to claim 1, characterized in that it consists of a four-sided refractory Stone with four upstanding edges and the one placed in the recess formed in this way, preferably tightly wedged exothermic material. Considered publications:
French patent specification No. 1112 520. 1 sheet of drawings © 009 630/343 10.60