SU1526889A1 - Apparatus for casting steel - Google Patents

Abstract

The invention relates to ferrous metallurgy, in particular to the casting of steel and alloys into molds. The purpose of the invention is to improve the manufacturability and expand the field of application of the device. The insert with the supporting elements 2 is mounted on the pallet 3 so that the vertical axes of the pouring cup 4 and the cavity of the insert 1 coincide. The metal stream during casting falls into the center of the insert and spreads along the bottom of the mold 5 through the gap between the lower base of the insert and the bottom of the mold, while splashing and splashing is extinguished by the walls of the insert. 2 Il.

Description

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The invention relates to ferrous metallurgy, in particular to the casting of steel and alloys into molds.

The purpose of the invention is to improve the technology and expand the field of application of the device.

1 shows a device used in casting steel from above; figure 2 - the same used when casting steel siphon.

The device consists of an insert 1, support elements 2, a pallet 3, a pouring cup k and a mold 5.

The insert with the supporting element is placed on the bottom of the mold so that the vertical axes of the pouring cup and the cavity of the insert coincide and the metal stream during casting falls into the center. inserts. The mass of the device is 20 kg. On top of the supporting elements on both sides of the insert, two bags of slag-forming mixture are placed. When the stopper opens in the bucket, the jet enters the insert cavity and spreads along the mold base through the gap between the lower base of the insert and the bottom of the spoon. At the same time, the splashes and splashes are extinguished by the walls of the insert and the metal simultaneously fills the insert and the structure. As the metal level reaches the upper base of the supporting elements, the slag-forming mixture begins to melt on the metal surface, which eliminates entanglement of slag particles in the metal. A significant portion of the heat of the molten steel is diverted to the support elements and the insert, heating them, thereby eliminating the welding of the metal to the mold. In addition, the metal weight is saved on this trim, equivalent to the mass of the proposed device.

The use of the device allows stacking paper bags with the mixture on the upper base of the supporting elements and provides a bottom supply to the slag-forming mixture and the formation of slag on the surface of the liquid metal, which eliminates the entanglement of slag particles in the metal.

When the base of the insert is displaced from the bottom of the mold by less than 0.25 the diameter of the exit section of the channel of the pouring glass, the metal spreads

at the bottom of the mold and freezes, the insert at its small height is filled with metal faster than it rises to the level of

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slag-forming mixture, which increases the likelihood of slag bh particles in the metal.

When the base of the insert is displaced from the bottom of the mold by more than 0.5 diameters of the outlet section of the channel of the pouring glass, when casting from above without using a slag-forming mixture, it spreads freely on the bottom of the mold, which can deteriorate the surface quality of this part of the ingot.

The height of the insert is chosen to be less than or equal to the height of the bottom part of the ingot to be removed. trim if its thickness exceeds 2 mm. which allows to use for the manufacture of the proposed device practically any waste of sheet, pipe and section metal from carbon, structural low-alloyed and other steel grades.

If the insert is made of sheet metal with a thickness of 2 mm or less, then its height may be greater: up to 20% of the height of the mold.

The height of the supporting elements must be less than or equal to the height of the bottom part of the ingot, which is removed to the cut, which ensures the required quality of the macrostructure of the ingot surface.

If the height of the support elements exceeds the specified limits, then when casting using slag-forming mixtures, the slag-forming mixture is melted after the metal is filled into the mold to the upper base of the support elements, which does not protect the metal from oxidation, cooling and formation of surface defects in the bottom part of the ingot. In addition, it becomes necessary to use support elements made of steels that are similar in composition to the metal to be cast and are cleaned from the oxide film, as well as to a limited thickness.

As the supporting elements in the proposed device can be used scrap steel rental current production: angles, channels, beams, rails, as well as fittings, rods, gaskets, etc.

Claims (1)

Invention Formula A steel casting device containing a casting nozzle, set forth. An insert with a support element located in its bottom part, characterized in that the purpose of improving manufacturability and ras-, rrai -., iHo,. widening of the field of use, the bottom of the pouring bottle. support elements relative to the bottom ki at a distance equal to the output diameter rrai -., iHo,. pouring glass. The support elements are shifted downward relative to the lower base of the insert by a distance of 0.2 ... 0.5 diameter of the output section of the channel