SU616053A1 - Chill mould - Google Patents

Description

The invention relates to foundry and will be used in the manufacture of castings from ferrous alloys by casting in a chill mold.

A chill mold made of steel or cast iron is known, the internal (working) surface of which is lined with a layer of copper with a thickness of 5 to 30 mm 1.

The disadvantage of this chill mold is low mechanical strength (hardness), as a result of which the chill mold fails due to the loss of dimensions of the working cavity and the removal of its surface.

The purpose of the invention is to increase the mechanical strength of the working surface of the chill mold, while preventing the melting or destruction of the cladding layer under the action of high temperatures of the cast metal.

This is achieved by introducing thermal bridges from materials with high thermal conductivity, for example copper, with a cross-sectional diameter equal to 4-10 thicknesses of the cladding and distances between themselves 2.3-3.2 times the specified diameters, while the thickness of the cladding is 0.05-0.5 times the reduced casting thickness.

FIG. I depicts the proposed chill; in fig. 2 - the same, with a refrigerator;

The chill mold has a frame 1 made of ferrous metal alloys, a lining 2 made of copper, aluminum or their alloys, thermal bridges 3 made of the same materials, and a refrigerator 4.

Thermal bridges are made, for example, in the form of cones, with a smaller base facing the facing layer, so that, due to their volumetric expansion under the action of heat, deformation of the facing is excluded.

When metal is poured into the chill mold and solidified, the casting 2 with thermal bridges 3 intensively removes heat to the refrigerator 4 or to the environment, and since the thermal conductivity of copper and aluminum is 12-26 times higher than the thermal conductivity of iron and steel passes through the frame 1, in connection with which its resistance to thermal deformations increases. The facing 2 prevents from the occurrence of the high-voltage mesh on the working surface of the frame 1, and the whole system

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(cladding 2, thermal bridges 3, refrigerator, 4) contributes to the uniform distribution of heat in the frame 1 and, accordingly, reduces its distortion. Thermal bridges, for ease of manufacture, for example, by drilling a chill mold frame and further pouring molten copper, aluminum or their alloys, are cylindrical with the conical surface of a portion of the thermal bridge from the cladding side to avoid deformation of this layer due to thermal stresses arising from heating and chill cooling during its operation. For chill molds without a refrigerator, the conical surface of the thermal bridge is located on the outer surface of the chill mold, and with a refrigerator, on the lining.

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Claims (1)

Claims of ferrous metal alloys, including cladding of non-ferrous metals, characterized in that, in order to increase durability, it is equipped with thermal bridges passing through it from materials with high thermal conductivity, such as copper, with a cross-sectional diameter of 4- 10 thickness of the cladding and. Costs between 2.3 and 3.2 times the diameter specified, with the thickness of the cladding being 0.05-0.5 of the given thickness of the casting. Sources of information taken into account in the examination: 15 1. USSR author's certificate, NO 108838, cl. B 22 D 15/00, 1957.