RU2528925C1 - Continuous casting machine with rotary mould - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: proposed machine comprises frame with struts 8, proportioning chute 10, spinning casting wheel 1, mould composed of shell 2 rigidly secured at wheel 1 and segment of bush 4 with case 5 and coolant feed channels 6 interacting therewith. Mechanism to press bush segment to said shell is composed of spring-loaded leverage 9 fitted on axle 7 fitted in frame strut 8. Liquid metal is fed by proportioner 10 to crystallisation zone composed by shell 2 and segment of bush 4. Ingot 12 moved from crystallisation zone is retained in bore of shell 2 by self-aligning rollers 14 and bent of by blade 15 and fed for further processing. To eliminate shrinkage clearance, said rollers have working surface width smaller than that of the ingot.

EFFECT: higher quality.

5 dwg

Description

The invention relates to the field of metallurgy and can be used for the production of continuously cast ingot (billet) from various metals and their alloys.

Known machine for continuous casting of an ingot into a fixed mold (sleeve) used in the casting of non-ferrous metals (A.I. Mayorov, A.S. Smolyakov. "Radial type machines for steel billets." Scientific publication "60 years of scientific design and production activities VNIIMETMASH. ”M.:“ Science ”, 2005, p.374-380). The machine includes a stationary water-cooled mold with a working surface to produce a continuously cast billet of various shapes - round, square or rectangular, and pulling rollers, which ensure the crystallized ingot is constantly pulled out of the mold. To direct the ingot to the cutting and transportation section, the mold is bent, with a bend radius of several meters, which significantly increases the dimensions of the machine. As a result, the ingot during crystallization takes a curved shape and, in the future, it must be unbent to give it a straight shape. The disadvantages of machines of this type are: low casting speed, increased dimensions, the inability to obtain an ingot of small cross section.

The closest analogue adopted for the prototype is a rotary continuous casting machine included in the line of a casting and rolling unit for the production of aluminum and copper wire rod (A.Yu. Shevchenko, V.A. Chebotarev, A.V. Samsonov, BC Karkushko, BCMorozov. "Casting and rolling units for the production of aluminum and copper wire rod." Heavy Engineering Magazine, 1997, No. 5. M .: Mechanical Engineering, p.12-14). The machine contains a metering device for feeding liquid metal, a frame with racks, a casting wheel with a rotation drive, a mold consisting of two parts, one of which is made in the form of a bandage with a recess fixed to the casting wheel, the shape of which corresponds to the shape of the ingot obtained, and the second made in the form of an endless steel tape tightening the casting wheel, interacting with the bandage and overlapping its tuck in the metal casting area. The machine is equipped with tension and pinch rollers holding the belt, as well as a cooling system. The disadvantage of such machines is that the steel tape tightening the wheel has a service life limited to one or two shifts, after which it must be changed, which requires a significant investment of time (the operation of the main equipment for installing the tape pre-welded into the ring stops). In addition, the crystallization zone of the ingot, formed by the undercut of the band and the tape, has a constant cross-section that does not take into account the shrinkage of the ingot, as a result of which a shrink gap is formed between the walls of the band and the hardened ingot, as a result of which the cooling rate of the ingot deteriorates, the cooling rate of the ingot decreases, which leads to reduced quality of the ingot. The use of such a mold allows only ingots with a flat surface formed on the side of the tape to be obtained with a limited width (up to 250 mm), since with a band undercut width exceeding 250 mm, the tape stretched over the wheel bends and distorts the shape of the ingot.

The technical result of the invention is:

- increase the period of continuous operation of the mold, therefore, increasing productivity and reducing operating costs;

- improving the quality of the ingot by eliminating the shrinkage gap, as well as increasing the cooling rate of the ingot;

- expanding the range of continuously cast ingots by producing ingots of various shapes, including round ingots, as well as ingots whose width exceeds 250 mm.

The technical result is achieved by the fact that a continuous casting machine with a rotary mold, containing a frame with racks, a metering device, a casting wheel with a drive, a mold made of two parts, one of which is rigidly fixed to the casting wheel, and the second is installed with the possibility of interaction with the first by means of the clamping mechanism, and the cooling system, is equipped with rollers mounted in several sections located along the ingot, while each roller is made self-adjusting, with the working erhnostyu whose width is smaller than the width of the ingot, the second part of the mold is designed as a sleeve segment having a cavity for supplying cooling water set in an ingot crystallization zone, pressing mechanism configured as a spring-loaded lever system is rotatably mounted on an axis fixed in the rack frame.

The invention is illustrated by drawings, in which:

Figure 1 - external view of the machine from the side of pouring metal;

Figure 2 is a transverse section aa;

Figure 3 is a longitudinal section bB;

Figure 4 is a section bb;

Figure 5 - rotary crystallizers with various cross-sectional shapes to obtain ingots of convex, round, wide shape.

The main working element of a continuous casting machine with a rotary mold is a rotating casting wheel 1 with a drive on which a part of the mold is fixed, made in the form of a band 2 with a recess. Another (second) part 3 of the mold is made in the form of a segment of a thick-walled sleeve 4, curved along the radius of the brace 2, and the housing 5, forming a cavity 6 for supplying cooling water. For self-installation, part 3 is mounted with the possibility of rotation on a fixed axis 7, fixed in the hole of the frame rack 8, and interacts with the bandage 2 by means of a clamp mechanism made in the form of a spring-loaded lever system 9. Liquid metal is poured into the crystallization zone from a metering device - a metering chute 10. As the casting wheel 1 rotates and the band 2 is cooled by water from the collectors with nozzles 11, the metal crystallizes, and after the crystallized ingot 12 leaves the crystallization zone to hold it in self-aligning rollers mounted in section 13 are installed at the point of the bandage 2 and further cooling along the movement of the ingot 12. To eliminate the shrinkage gap between the crystallized ingot 12 and the walls of the bandage 2, the rollers 14 are made with a working surface whose width is less than the width of the crystallized ingot 12, due to which provides reliable pressing of the ingot 12 to the walls of the brace 2. The brace 2 and sections 13 of the rollers 14 are cooled by water flowing to the nozzles 11 of the cooling manifold.

The operation of a continuous casting machine with a rotary mold is as follows. The casting wheel 1 with the bandage 2 attached to it constantly rotates at low speed, and the segment of the thick-walled sleeve 4 with the housing 5 pressed to the bandage 2 with the body 5 slides along the bandage 2. The liquid metal is fed through the dispenser groove 10 into the crystallization zone formed by the recess of the bandage 2 and the working surface of the segment of the thick-walled sleeve 4. Cooling water is supplied to the cavity 6. To eliminate the resulting shrinkage gap between the walls of the bandage 2 and the crystallizing ingot 12, the crystallization zone is performed with the expansion in the direction of pouring metal. The metal entering the crystallization zone, crystallizes, moves along with the bandage 2 and slides the corresponding side of the ingot 12 along the working surface of the segment of the sleeve 4. After leaving the crystallization zone, the ingot 12 passes a distance approximately equal to half the circumference of the casting wheel 1, being held by the rollers 14 in the undercut the bandage 2, then bends with a knife 15 and on the live rolls of the rack 8 goes to further processing (Fig.1-4).

To obtain ingots of various shapes, a continuous casting machine with a rotary mold contains molds that allow to produce, including round ingots, as well as ingots whose width exceeds 250 mm (Figure 5).

The continuous casting machine with rotary crystallizer has small overall dimensions and weight, and the reduction in the number of downtime associated with the replacement of worn parts of the mold can significantly increase the duration of continuous operation and increase its productivity.

The quality of continuously cast ingots is also improved by eliminating the shrinkage gap, their range is expanding due to the possibility of obtaining ingots of various shapes, up to the receipt of a round ingot or continuously cast wide strips and sheets.

Claims (1)

A continuous casting machine with a rotary mold, comprising a frame with racks, a metering device, a casting wheel with a drive, a mold made of two parts, one of which is rigidly fixed to the casting wheel, and the second is installed with the possibility of interaction with the first part by means of a clamp mechanism, and cooling system, characterized in that it is equipped with rollers mounted in several sections located along the ingot, each roller being self-aligning, with a working surface the width of which is less than the width of the ingot, and the second part of the mold is made in the form of a segment of a sleeve and a housing installed in the crystallization zone with a cavity for supplying cooling water, while the clamping mechanism is made in the form of a system of spring-loaded levers and is mounted with the possibility of rotation on an axis fixed in rack frame.

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