RU2136437C1 - Plant for continuous casting of castings - Google Patents

Abstract

FIELD: equipment for metal continuous casting. SUBSTANCE: plant has mold with wide and narrow walls made for motion, tundish with immersion casting dead-bottom nozzle whose side surface of lower part has through holes for metal discharge. Additionally, external and internal surfaces of nozzle are conical with generating line parallel to surfaces of walls located at angle to vertical. In addition, axes of outlet holes of nozzle in its installation into mold are parallel to surface of walls located vertically. Height b and width a of nozzle outlet hole are related as b/a=4-6. EFFECT: higher production efficiency, increased yield of standard castings, improved quality of casting surface and internal structure, and higher stability of immersion casting nozzle. 2 cl, 3 dwg

Description

 The invention relates to metallurgy, in particular to processes for the continuous casting of metal into a water-cooled mold.

A device for continuous casting of preforms is known (RF Patent N 2077409, class B 22 D 11/10. Device for continuous casting of preforms / V. V. Stulov, V. I. Odinokov. Publish. 04.20.97 Bull. No. 11 ), containing a mold with wide and narrow walls, made with the possibility of movement, one pair of which is located vertically, and the other is at an angle to the vertical, an intermediate ladle with a submersible casting nozzle, in the lower part of the side surface of which through holes are made opposite each other for metal release, and the axis of the opening Ia for discharging metal parallel to the inclined walls of the mold and form with it a horizontal plane an angle ^o 5-10.

 A disadvantage of the known device for continuous casting of billets is the insufficient efficiency of mixing the melt in the horizontal plane of the mold with inclined walls, firstly, as a result of the irrational shape of the outer surface of the glass, and secondly, due to the penetration of jets of melt along the vertical walls into the region of the workpiece formation . The penetration of the melt into the region of the formation of the workpiece leads to a difference in the thickness of the crust along the perimeter of the mold, respectively, to cracking of the deformed metal.

 The inventive device is aimed at creating a high-performance process for producing continuously cast billets.

The technical result obtained by the implementation of the inventive device is:
- increasing the productivity of the process of obtaining continuously cast billets.

- increase the yield of billets;
- improving the quality of the surface and the internal structure of the workpieces;
- increasing the resistance of the submersible filling glass.

 The inventive device is characterized by the following essential features.

Limiting signs: crystallizer with wide and narrow walls; the walls of the mold are movable; one pair of walls is located vertically, and the other is at an angle to the vertical; intermediate bucket with a submersible nozzle; in the lower part of the side surface of the glass are made opposite each other through holes for the release of metal; the axis of the hole for the release of metal make up with its horizontal plane an angle of 5-10 ^o .

 Distinctive features: the outer and inner surfaces of the glass are made conical with a generatrix of surfaces parallel to the walls located at an angle to the vertical; the outlet openings of the glass are slit-shaped with a ratio b / a = 4-6, where b and a are the height and width of the hole, respectively; the axis of the outlet openings of the glass are parallel to the surfaces of the walls located vertically.

 A causal relationship between the set of essential features of the claimed device and the achieved technical result is as follows.

 The implementation of the outer surface of the glass conical with a forming surface parallel to the walls located at an angle to the vertical creates favorable conditions for observing the depth of immersion of the glass and the width of the space occupied by the glass in the upper part of the mold. In addition, the resistance to melt flow around the surface of the glass decreases and its possible extraction from crystallizing metal improves in case of malfunction of the device and overflow of the mold.

 The implementation of the inner surface of the glass conical with a generatrix surface parallel to the walls located at an angle to the vertical, provides the same wall thickness in each horizontal section of the glass and improves the technology of its manufacture. In addition, a more uniform flow of the melt from the holes and more uniform wear of the inner surface of the glass is ensured.

 The manufacture of the outlet openings of the glass slit-like with a ratio b / a <4 leads, on the one hand, with a constant width of the opening a to insufficient melt consumption as a result of a decrease in the area of the outlet (a • b), and on the other hand, when the width of the opening a to a decrease in the strength of the glass as a result of a decrease in the cross section of the wall.

 The manufacture of the outlet openings of the glass slit-like with a ratio b / a> 4 in some cases leads to the penetration of the melt jet beyond the limits of the mirror, and, accordingly, to its oxidation and downloading of the protective slag mixture. As a result, there is a need to increase the immersion depth of the conical cup and increase the level of pouring, which in some cases is not practical for technological reasons.

 The location of the nozzle in the mold so that the axis of the outlet holes are parallel to the surfaces of the vertical walls, eliminates the penetration of jets into the lower part of the mold in the area of deformation of the workpiece. In this case, the effect of convective melt flows on the crust decreases and its thickness is more uniform along the perimeter of the mold.

 In FIG. 1-3 show the appearance of the inventive device for continuous casting of billets.

 The inventive device of FIG. 1-3 consists of an intermediate bucket 1 with a locking mechanism, a submersible deep-sea conical casting nozzle 2 with two slit-like outlet openings 3, a mold 4 with the possibility of movement with vertical 5 and at an angle to the vertical walls 6.

 Prior to casting the metal, the lower part of the mold is blocked by a special device - a seed, which prevents the pouring out of the melt. The glass 2 is installed so that the axis of the holes 3 are parallel to the surfaces of the walls 5.

 The operation of the device in FIG. 1-3 is as follows.

 The locking mechanism is lifted and the molten metal from the intermediate ladle 1 through the cup 2 with the outlet 3 enters the mold 4. After immersing the outlet 3 in the melt and forming the workpiece crust, the drive for moving the vertical walls 5 and the walls 6. located at an angle to the vertical is turned on. the walls 5 make a reciprocating movement with the ejection of the workpiece, and the walls 6 - a complex rotational movement with compression of the metal crust.

Claims (2)

1. Device for continuous casting of billets, containing a mold with wide and narrow walls, made with the possibility of movement, one pair of walls is located vertically and the other at an angle to the vertical, an intermediate ladle with a submersible casting deaf glass, in the lower part of the side surface of which opposite each other through holes for the release of metal, comprising an angle of 5 - 10 ^o with a horizontal plane, characterized in that the outer and inner surfaces of the glass are made conical with generatrix parallel to the surface of the walls, located at an angle to the vertical.  2. The device according to claim 1, characterized in that the through holes for the release of metal in the glass are slit-shaped with a ratio b / a = 4-6, where b and a are the height and width of the hole, respectively, and the axis of the holes are parallel to the wall surfaces located vertically .

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