SU925528A1 - Ingot mould for producing square section ingots of ferroalloys - Google Patents

Description

section of the working cavity of the mold at half its height.

The known mold is simple to manufacture and has a relatively small contact surface between the metal mirror and the atmosphere.

However, the small taper of the walls of the mold does not allow to use it for casting ferro-alloys, in particular ferrovanadium, since the extraction of an ingot from such idle area and significant difficulties. The result is a low mold resistance.

In addition, with the above-noted H: D and H: B ratios, the ingots have a greater height, which also makes them undressing.

During cooling the ferrovanadium is prone to cracking, which causes its pieces to wedge and, in combination with the above mentioned other drawbacks, makes the beating of ingots from such molds almost impossible.

The aim of the invention is to facilitate stripping of ingots from ferroalloys, in particular ferrovanadium, an increase in yield and an increase in the durability of the mold.

The goal is achieved by the fact that in the proposed mold for making ingots of rectangular cross section extended downwards, the taper to one side is 6-14%, the ratio of the height to the reduced diameter of the noseal cross section of its working cavity and. the mean width of this cavity is 0.7–1.5 and 1.5–3.0, respectively, and the ratio of the average length of the working cavity of the mold to its width is 4.0–6.0.

FIG. 1 and: zobr: agena stasis, longitudinal section; in (Fig. 2 - section aa in Fig. 1.

Ferrovanadi casting and stripping of the ingots is made as follows.

A cast-iron mold with walls 1 expanding downwards is installed before casting on a metal pallet 2 with a refractory lining 3.

Ferrovanadium is cast from the bucket through a locking device or through the toe of the bucket and lined chute. After the ingot solidifies, the mold is raised by the pins 4, while the ingot remains on the lined pan. After stripping, the ingots are sent for cutting and crushing.

When the value of x H: D and H: B is greater than 1.5 and 3.0, respectively, stripping of ingots is difficult due to the increase in their height, g

With a ratio of A: B of less than 4.0, the thickness of the ingot increases, making it difficult to cut and crush. This leads to higher metal losses in the form of substandard waste and crushing

devices.

With respect to A: B over 6.0, the durability of the molds is reduced due to warping.

The value of the taper of the walls of the mold less than 6.0% makes it difficult to strip the ingots, and the taper of more than 14% causes an increase in the thickness of the lower part of the ingot, which makes it difficult to crush.

The table shows examples of specific implementation of the mold, indicating its size (№JVb 1-3). Here are the parameters of the mold with a deviation from the limiting values (LNI 4, 5). For

Comparison shows the results of testing a known mold (No. 6).

 1,22 - wide face taper; 0.92 - narrow face taper.

TaiKHM way, the parameters of the mold provide the yield

1, g, about 0.98 0.61, 70 0.57 2.20

Claims (3)

96.5-97.0% and durability of molds from 20 to 23 fills. When the parameters of the presentation deviate from the limiting values, the yield of the suitable one decreases to 90.2-94.7%, and the resistance to 10-16 fillings. The known mold is characterized by a yield of about 80%, while extracting the ingot from the mold without destroying it. no chances are possible. When the values of H: D, H: B and taper, respectively, more than 1.5; 3.0; 14 when A: B is less than 4.0, the surface of the metal mirror in the mold and the ingot thickness sharply increase, which increases the waste of the metal and makes it difficult to crush the ingot. In addition, the tapering (more than 14%) of the mold leads to an accidental movement of the metal in its lower part. With the values H: D, H: B and taper, respectively, less than 0.61; 1.5; 6 for A: B over 6.0, stripping the ingot is difficult and the mold is warped. The result of the foregoing is a reduction in the yield of the metal and a decrease in the durability of the mold. The developed parameters of the proposed mold were carried out and confirmed by testing them in the ferrovanadi shop of the NPO Tulachermet. The test of the proposed mold showed its resilience, the burnout of the metal to the mold walls was not observed, the loss of ferrovanadium in the form of substandard waste during cutting and crushing of the ingots did not exceed 2%, the waste of the metal was no more than 1.5%, the average yield increased by 12%. The invention The ingot for making ingots of rectangular cross-section from ferroalloys, mainly ferrovanadium, expanded downwards, characterized in that, in order to increase the yield and increase the durability of the mold, the taper to one side is (6-14%) the reduced cross-sectional diameter of the working cavity and the average width of this cavity are 0.7-1.5 and 1.5-3.0, respectively, and the ratio of the average length of the working cavity of the mold to its width is 4.0-6.0. Sources of information taken into account when Expertise: 1.Swedov L.V. et al. Smelter of Ferroalloys, M., Metalsfgi, 1973, p. 264. 2. Authors certificate of the USSR X9 337190, cl. B 22 D 7/06, 1972. 3. Trubin K.S. and others. Steel metallurgy. M., 1970, p. 333-364.