RU2524U1 - STEEL TABLE - Google Patents

Abstract

Steel mold, consisting of components, characterized in that its components are connected by a spring device, the specific compression force of which is 2 - 25% of the compressive strength of the mold steel at normal temperature.

Description

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DIGITAL OUTDOOR

The utility model relates to the field of metallurgy, in particular to the design of a steel mold for casting liquid metal for the purpose of casting ingots

To improve access to the place of removal of the burnt layer of the molding earth, molds are used, made of separately cast and then welded tea, / Drawings 354-2С-2 and 354-2С-1; Izhorastal plant St. Petersburg /

In Fig. 1, the mold is shown assembled with a profitable extension and cast ingot. The disadvantage of such molds is the formation after casting of 15-25 ingots of metal sag on the inner surface of the mold and the appearance of a gap at the place of joining of its tea, which leads to the formation of circular metal bands on the ingots invalid sizes / FIG. 1, the dash-dot line / and prevents the ingot from being extracted from the mold.

The purpose | of the creation of the proposed utility model is to solve the problem of increasing the manufacturability and operation of the ingot mold and improving the quality of the ingot.

The solution to the problem is achieved by fixing the connected parts of the mold is carried out using a spring device, the specific compression force of which is 2 25 limit

the strength of the mold steel at normal temperature.

When pouring liquid metal into the mold (FIGL), its inner layers are intensively heated to a temperature reaching I OOISOO C / nafig for liquid steel. 1, this layer is shaded / and, as a consequence, thermal expansion of the inner layers. In the molds with welded parts, the expanding layers in the joint exert strong mechanical pressure DRZP7 on each other. The pressure direction is shown in Fig. 1 by the arrow P

Since at a temperature of 1200-1500 0, the compressive strength of steel decreases 3 -f 40 times, the indicated pressure P per unit area exceeds it and the metal deforms at the joint in the only free direction inward of the mold, and sagging forms.

After extraction of the crystallized ingot and cooling of the mold, the flows remain. In addition, due to the decrease in the volume of the inner layers after cooling of the mold, a gap appears in the joint between the components, With each subsequent ingot cast, the size of the flows and the gap increase. At the same time, a circular protrusion appears on the ingots in a suitable place, the dimensions of which also increase. This makes it difficult to remove the ingots from the mold. Approximately after 15-25 ingots, the ingots are not removed from the mold. The protrusions qualify as surface defects and are removed before rolling the ingots.

For the further operation of such molds, their repair is required, which consists of the following operations;

-Jl / weld, separation of composite tea, removal of sag, welding of metal on the components at the point of formation of the gap, machining of the weld site, assembly of the components and their re-welding,

In the proposed design of the mold, the components of the mold are not connected by welding, but by the spring device of one of the known structures, for example, spring rings / Fig.2/, while the surface layers of metal of the mold expanding when heated, push them apart. Moreover, a specific compression force of the spring device of 4 -50 times less than the compressive strength of the material of the mold-steel at normal temperature, which completely eliminates the deformation of the metal at the junction of the components of the mold.

After the ingot is removed and the mold is cooled, the surface layers reduce their volume to their original sizes and the components are returned to their original position under the influence of a spring device without forming a gap between them. A circular protrusion on the ingot is not formed.

Figure 1 presents the mold similar to the welded joint of the components of the mold.

Figure 2 presents the proposed design of the mold with a spring connection of the components,

Currently, the applicant is developing working drawings of a steel mold, consisting of two parts / 1.2 figure 2 /; Component parts 1.2 of the mold are connected by spring rings 3.

The design of the mold will ensure its use with obtaining the above technical results.

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Claims (1)

Steel mold, consisting of components, characterized in that its components are connected by a spring device, the specific compression force of which is 2 - 25% of the compressive strength of the mold steel at normal temperature.