SU1740117A1 - Steel trumpet pouring apparatus - Google Patents

Abstract

Usage: obtaining ingots of metals and alloys. SUMMARY OF THE INVENTION: The device comprises a siphon tray with holes mounted on it, centered with a sprue funnel and a mold. In the lower part of the sprue funnel is placed a throttling sleeve made of a material soluble in a liquid metal, mainly silumin. In this case, the outer surface of the throttling sleeve has a reciprocal shape with the inner surface of the funnel, the height of the throttling sleeve is 0.4-0.7 of the height of the sprue funnel, and the internal diameter of the throttling sleeve is 0.5-0.7 of the inner diameter of the lower part of the sprue funnel. 1 hp f-ly, 2 ill., 1 tab.

Description

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This invention relates to ferrous metallurgy, in particular to metal casting.

The purpose of the invention is to improve the quality of the surface of the bottom part of the ingot and increase the yield.

The goal is achieved by the fact that the device containing a tray with siphon wiring with a centering, sprue system and mold installed on it is provided with a throttling sleeve made of liquid material soluble in the lower part of the gating funnel, and the outer surface of the choke sleeve has a response form with the inner surface of the funnel, and the height of the choke bushing is 0.4-0.7 of the height of the sprue funnel, the internal diameter of the choke bushing is 0.5-0.7 of the inner diameter tra bottom sprue funnel.

The choke sleeve is made of silumin.

Considering the design of the device, it is possible to fill the bottom part of the mold with a braking jet, to limit the hydraulic impact of the metal at the initial moment of casting, which ensures smooth flow of the metal jet without splashing. This mode of casting provides the bottom part of the ingot without surface defects and, as a consequence, increases the yield of the metal during rolling.

As the metal passes through the funnel and the mold is filled, the sleeve gradually erodes, and the casting mode is changed to a regulated one.

The height of the sleeve should correspond to 0.4-0.7 of the height of the funnel, since reducing the height of the sleeve to less than 0.4 of the height of the funnel does not provide the necessary efficiency of jet braking at pressure 2

about

the bottom part of the ingot due to its rapid erosion. When the height of the sleeve is more than 0.7, the height of the funnel makes it difficult to maintain the required level of metal in the funnel above the sleeve because of the difficulty of quickly changing the amount of metal coming from the ladle, which leads to metal splashes.

Matching the inner surface of the funnel and the outer surface of the sleeve ensures that the position of the sleeve is reliably maintained and to prevent its emergence even when the sleeve is made of very light materials. If this requirement is not fulfilled, lateral erosion of the sleeve takes place, its position changes, which leads to violation of the casting mode.

The minimum internal diameter of the sleeve is 0.5-0.7 of the inner diameter of the funnel in its lower part. Increasing this ratio by more than 0.7 virtually eliminates the effect of braking the metal jet, and a decrease in the ratio of less than 0.5 leads to a drastic reduction in metal consumption, which causes metal to spill out of the funnel, and in some cases, metal clogging in the gating system.

The manufacture of a sleeve from silumin allows, in addition to the throttling effect, to gain an additional effect. When the sleeve is washed out, silumin falls directly into the metal, and as a result, additional deoxidation of the first portions of the metal rinsing the gating system is achieved.

The device allows to provide a high quality surface of the bottom part of the ingots.

FIG. 1 and 2 show a device for siphon ingot casting.

The device comprises a center 1 communicating with siphon wires 2 mounted on a pallet 3 on which the molds 4 are located. In the sprue 5 there is a throttling sleeve 6.

The device was tested with a siphon spill bearing bearing steel into ingots weighing 3.6 tons. The silumin bushing was placed in a metal receiving hopper, after which the metal was cast. The effect of the geometric parameters of the sleeve on the quality of the ingots was checked by evaluating

quality of finished metal. The technology of smelting the source metal and casting did not change.

At the initial moment of casting (when the gate was opened), some accumulation of metal was observed in the metal receiving hopper, which was caused by the restriction of the metal entering the gating system by the sleeve located in the hopper. Then there was a gradual melting.

bushings, and casting went into normal mode.

The quality indicators of rolled products, the floor of the scientist during casting using the known and proposed devices are given in

the table.

From the experimental data shown in the table, it follows that the use of the proposed device provides a reduction in the accuracy of these rods

by 3-4% defects.

The expected economic effect from the introduction of this device is 3-4 rubles per ton of steel.

Claims (2)

1. A siphon casting device for steel, containing a siphon tray, mounted on it with a sprue gutter and a mold, characterized in that, in order to improve the quality of the surface of the bottom part of the ingot and increase the yield, it is provided with a throttling sleeve from the material soluble in the liquid melt placed in the lower part of the gate sprue, the outer surface of the funnel responding, the height of the throttling bushings are 0.4-0.7 height gating funnel, and the internal diameter of the throttling sleeve is 0.5-0.7 internal diameter of the lower part of the gating funnel. 2. The device according to claim 1, characterized in that the throttling sleeve is made of silumin. figure 1 F1 / G.2