SU1458069A1 - Hot top for ingot mould - Google Patents

Abstract

The invention relates to ferrous and non-ferrous metallurgy, in particular, to designs of profitable extensions for warming the head part of an ingot. The goal invented - the expansion of technological capabilities. The metal is wired through an additional through heat-insulated cavity 5 formed by a conical insert 3 and insulation 6, and through holes 8 formed by the lower parts of the cores 3, 6 and sectors 9, which serve to fasten the conical insert 3 to the insulation 6. Flood metal heats the insulation 6 and the conical insert 3, which reliably insulate the working cavity 4, effectively feeding the central area of the ingot, which is most susceptible to shrinkage friability and axial porosity defects. 2 il .. I (L; o

Description

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The invention relates to ferrous and nonferrous metallurgy, in particular, to designs of profitable extensions for warming the head part of an ingot.

The aim of the invention is the expansion of technological capabilities.

FIG. 1 shows a heater for a mold, a longitudinal section; in fig. 2 - the same, top view.

Case 1 insulation is made in the form of a metal ring with shoulders mounted on a mold

2, and has a heat insulating insert 3, made in the form of a hollow truncated cone, forming a working cavity 4. Additional through cavity

5 trapezoidal profile with expansion up formed by the walls of the conical insert 3 and insulation 6, adjacent to the body. 1. Inside the insulation 6 there is a channel along the perimeter filled with thermal insulator 7 with increased heat capacity (for example, kaolin wool), the direct contact of which with a liquid metal leads to contamination of the latter. An additional through cavity 5 is open in the direction of the mold 2 through holes 8 formed by the walls of the conical insert 3, insulation 6 and fastening elements 9 connecting them, which can be made in the form of rods, sectors and npv. In the specific example of implementation

3, insulation 6 and fastening elements 9 are made of a single piece of electrical graphite of the GE mark;

By machining on a turning and milling machine, an additional cavity allows guidance. The housing 1 can be made for casting precisely through this cavity, one piece with the mold 2. a working heater for this mold for use of the mold from this function. As a result, the insert 3, formed for the casting of cylindrical trapezoidal sections of aluminum-beryllium alloys 45 to the cavity, can almost completely overlap the metal mirror, reinforcing the thermal shielding effect. A prerequisite for this is to maintain a small hole in the top of the gas removal insert 3.

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by the method of pouring on the walls into the tilting mold. -

Casting begins when the position of the mold is rotated 90 relative to the horizontal. In the first 20 seconds, the mold is rotated evenly at a speed that ensures its filling to approximately 2/3 of the working volume. In the next 45 seconds, the speed of rotation of the mold is changed by the IMM, so that by the end of the cycle, the mold is in a vertical position. The last filling phase is the slowest, and the liquid

Claims (1)

Invention Formula Insulation for molds, comprising a housing with a working cavity and with an extra cavity located along the perimeter, formed by a solid wall, which distinguishes 0 0 the metal, filling the working and additional cavities 4 and 5, gives off heat to the conical insert 3 and insulation 6, which are heated during the casting process and accumulate this heat. With an increase in temperature, the thermal resistance of the insulation 6 and the conical insert 3 increases even more, as a result of which the metal of the additional cavity 5 remains in liquid form, heating, in turn, the metal of the working cavity 4. As a result, the trapezoidal profile of the working cavity 4 ) in combination with the heating of this cavity from the outside by the metal of the additional cavity 5, create a kind of double thermal shielding of the working cavity 4, which allows the metal of the working cavity to be kept in a liquid state during webbings required to obtain an ingot without shrinkage defects. As the ingot crystallizes 5, the liquid “metal of the working cavity (the hottest) goes to feed its central region. Metal additional cavity 5 enters the working cavity 4, where due to the effect 0 double thermal shielding is kept in the liquid state and feeds the outer layers of the central part of the ingot. In the manufacture of experimental castings observed 5 full metal withdrawal from the working and additional cavities to compensate for axial shrinkage defects. Use of a trapezoid through section extending upwards Invention Formula Insulation for the mold, comprising a housing with a working cavity and with an additional cavity located along the perimeter, formed by a solid wall, characterized by - U58069 so that, in order to expand to the wall in the lower part, technological capabilities are connected, completely with the hull bridges. FIG. 2