RU2785732C1 - Tundish of multi-strand continuous casting machine - Google Patents

Abstract

FIELD: ferrous metallurgy.

SUBSTANCE: invention relates to the field of ferrous metallurgy, in particular to a machine for continuous casting of metals. The tundish of the multi-strand continuous casting machine is made in the form of a metal body with longitudinal walls 1 and 2 located on both sides of the axis 3 passing through the center of the outlet holes 4. The longitudinal wall 2 is made in the form of a rectangle and is parallel to the opposite wall 1 with a section 9 in the middle parts, and the length of section 9 is 1.5-1.7 times less than the distance between two adjacent steel-cutting holes 4, the length of section 9 from axis 3 is 1080-1085 mm, and the width of section 9 is 270-272 mm from axis 11 with corners turns α between sections 9 and 10 of the longitudinal wall 2, amounting to 30°, and the place of conjugation of sections 9 and 10 of the longitudinal wall 2 in the area of the metal receiver 14 of the place of pouring metal in the transverse section has an arcuate shape with a radius of curvature R equal to 700 mm from the outer side of the intermediate bucket.

EFFECT: increase in the durability of the reinforcing lining of the tundish up to 1200 heats and increase the series production of the tundish up to 17 heats.

1 cl, 3 dwg

Description

The invention relates to the field of ferrous metallurgy, in particular to a machine for continuous casting of metals.

Known tundish for simultaneous casting of four ingots [1] (General metallurgy, Textbook for universities, Voskoboynikov VG, Kudrin VA, Yakushev AM, 2002), having a steel casing. The ladle is lined from the inside with fireclay bricks, one or more glasses are installed in the bottom, equipped with stoppers. To reduce heat loss, the ladle is covered with a lined lid.

The disadvantage of this tundish is the reduction in the degree of wear of the reinforcing lining of the tundish by the action of aggressive metal flows along the lining of the metal receiver turns due to a change in the design of the metal receiver with a smooth transition along the wall of the tundish with an angle α of 30°, instead of 10-15.

The closest analogue (prototype) to the present invention is the tundish of a multi-strand continuous casting machine for pouring transport metal [2] (USSR author's certificate No. 954159, Tundish of a multi-strand continuous casting machine, IPC: B22D11 / 10, publ. 08/30/1982, Bull. No. 32), made in the form of a body with longitudinal walls, in which in the middle of one longitudinal wall a U-shaped hole is made perpendicularly, to which the place of pouring metal from the steel-pouring ladle to the tundish is moved.

The disadvantage of this body of the tundish is that when the tundish is completely filled, the circulation of metal flows is disturbed, which leads to the formation of stagnant zones of the outer streams.

The technical result of the present invention is: the development of the design of the metal receiver chamber, which is characterized by increased durability and operational reliability and metal quality due to the formation of a flatter turning area, which makes it possible to increase the durability of the tundish reinforcing lining and increase the series production of the tundish.

The specified technical result is solved due to the fact that in the tundish of a multi-strand continuous casting machine, made in the form of a metal case with longitudinal walls 1 and 2 located on both sides of the axis 3 passing through the center of the outlet holes 4, the following differences are provided: longitudinal wall 2 made in the form of a rectangle and parallel to the opposite wall 1 with section 9 in the middle part, and the length of section 9 is 1.5-1.7 times less than the distance between two adjacent steel tapping holes 4, the length of section 9 from axis 3 is from 1080 to 1085 mm , and the width of section 9 is from 270 to 272 mm from the axis 11 with angles of turns α between sections 9 and 10 of the longitudinal wall 2, constituting 30 °, and the place of conjugation of sections 9 and 10 of the longitudinal wall 2 in the area of the metal receiver 14 of the place of pouring metal in the transverse section has an arcuate shape with a rounding radius R equal to 700 mm from the outer side of the tundish.

The presence of a smooth transition along the longitudinal walls 1 and 2 of the tundish between sections 9 and 10 at an angle of 30° allows you to reduce the degree of wear of the reinforcing lining 12 of the tundish by reducing aggressive metal flows 13 to the lining of the turns of the metal receiver 14.

The presence of conjugation of sections 9 and 10 in the area of the metal receiver 14 in the form of an arcuate shape with a radius of rounding R equal to 700 mm from the outer side of the tundish, reduces the aggressive effect on the reinforcing lining of the tundish, with an increase in this radius, the aggressive effect on the reinforcing lining becomes higher, from -for increasing the speed of metal flows. With a decrease in the radius of rounding, the necessary circulation of the metal for its mixing will not be provided.

The length of section 9 from axis 3 in the middle part of the longitudinal wall 2 is from 1080 to 1085 mm, the width of section 9 is 270-272 mm from axis 11, the length of section 9 is 1.5-1.7 times less than the distance between two adjacent steel tapping holes 4, which makes it possible to reduce the aggressive circulation of metal flows and the wear of the tundish reinforcing lining.

The essence of the present invention is illustrated by drawings:

Fig. 1, which shows the proposed tundish (plan view);

Fig. 2, which shows the tundish of a multi-strand continuous casting machine for casting transport metal (side view);

Fig. 3, which shows a diagram of the circulation of metal flows in the proposed tundish.

Description of reference position numbers.

1. longitudinal wall;

2. longitudinal wall;

3. axis;

4. outlet holes;

5. side walls;

6. stop blocks;

7. locking mechanism;

8. cover;

9. plot;

10. plot;

11. axis;

12. reinforcing lining;

13. direction of metal flows;

α - turn angle;

14. - metal receiver

The body of the tundish (Fig. 1) contains two longitudinal walls 1 and 2, located on both sides of the axis 3 passing through the centers of the outlet holes 4, the number of which corresponds to the number of streams of the machine. The side walls 5 are located perpendicular to the axis 3. Inside the body is lined with reinforcing lining 12. The outlet holes 4 are closed and the outflow is adjusted by stop blocks controlled by stop mechanisms 7. The tundish is closed from above by a cover 8 (Fig. 2).

The longitudinal wall 2 in (Fig. 1) is made in the form of a rectangle and is parallel to the opposite wall 1 with a section 9 in the middle part with a height from axis 3 from 1080 to 1085 mm and a width from 270 to 272 mm from axis 11. The longitudinal wall 2 is associated with sections 9 and 10 in the area of the metal receiver 14 in the form of an arcuate shape with a radius of curvature R equal to 700 mm from the outside of the tundish. The angle of turn α between sections 9 and 10 of the longitudinal wall 2 on the inside of the tundish is 30° degrees.

The proposed shape of the tundish makes it possible to improve the circulation of the metal, which ensures continuous mixing of the metal volumes from the moment the ladle is filled. Serving in the place of the metal receiver 14, pouring metal due to the effect of near-wall adhesion of the metal flow propagates along the longitudinal wall 2, which has an arcuate shape with a turn angle of 30° in sections 9 and 10, increases the main mass of the metal behind it and thereby reduces the pressure of the metal in other directions.

Moving from section 9 to sections 10, metal flows 13, due to rotation and the same speed along their cross section, smoothly go around these sections and along an arc, metal flows 13 are directed to the extreme and middle sections of the outlet holes 4 (Fig. 3). The time of movement of the flow of metal 13 along the trajectory 13 to the extreme and middle outlet holes 4 is the same. As a result of this, the properties of the metal distributed over the various streams of the machine are averaged.

The tundish of a multi-strand continuous casting machine for transport metal works as follows.

The metal is fed into the metal receiver 14. (Fig. 3) Due to the smooth transition along the longitudinal wall 2 sections 9 and 10 due to the angle of rotation α between them, which is 30° degrees in the direction of movement of the metal 13, the aggressive effect of metal flows on the lining 12 is reduced. Metal distributed to the various streams of the machine through 4 outlets.

In the process of developing the design of the tundish of a multi-strand continuous casting machine, the optimal ratio of the sizes of sections 9 and 10 of the longitudinal wall 2 was determined.

The data are based on the results of a number of tests carried out in the converter shop of EVRAZ NTMK JSC. During the tests, it was found that: - the value of the angle of turn α less than 30° leads to advanced wear of the reinforcing lining of the tundish turns due to turbulent metal flows;

- the value of the turn angle α is more than 30°;

- with a radius of curvature R greater than 700 mm leads to advanced wear of the reinforcing lining of the tundish turns due to turbulent metal flows;

- with a rounding radius R less than 700 mm, it was found that when filling the tundish, predominantly laminar flows of melt outflow occur;

The choice of design parameters of section 9 of the longitudinal wall is due to the following:

The height of section 9 from axis 3 is from 1080 to 1085 mm. When the height of section 9 is less than 1080 mm, the serialization of the tundish and the durability of the reinforcing lining 12 are reduced. If the height of section 9 is more than 1085 mm, this tundish becomes more expensive.

The width of section 9 is from 270 to 272 mm from the axis 11. When the width of section 9 is less than 270 mm, there is an advanced wear of the reinforcing lining of the tundish turns and, as a result, having turbulent flows and wear of the shotcrete layer of the tundish. When the width of section 9 is more than 272 mm, predominantly laminar flows of melt flow occur.

The length of section 9 is 1.5-1.7 times less than the distance between two adjacent steel tapping holes 4 to minimize metal loss when draining slag from the tundish.

The tests have confirmed that the chamber of the metal receiver 14, implemented in a patented design with the recommended geometric dimensions, allows: to increase the durability of the reinforcing lining 12 of the tundish to 1200 heats and to increase the series production of the tundish to 17 heats.

Thus, the claimed technical solution fully fulfills the technical result.

The analysis of the prior art, including the search for patents and scientific and technical information and the identification of sources containing information about the analogues of the claimed technical solution, made it possible to establish that the applicant did not find sources characterized by features identical to all essential features of the claimed invention.

Therefore, the claimed invention meets the criteria of "novelty" and "inventive step".

Sources of information:

[1] General metallurgy, Textbook for universities, Voskoboinikov V.G., Kudrin V.A., Yakushev A.M., 2002;

[2] USSR author's certificate No. 954159, Tundish of a multi-strand continuous casting machine, IPC: B22D 11/10, publ. 08/30/1982, bul.

Claims (1)

The tundish of a multi-strand continuous casting machine made in the form of a metal body with longitudinal walls 1 and 2 located on both sides of the axis 3 passing through the center of the outlet holes 4, characterized in that the longitudinal wall 2 is made in the form of a rectangle and is parallel to the opposite wall 1 with section 9 in the middle part, and the length of section 9 is 1.5-1.7 times less than the distance between two adjacent steel tapping holes 4, the length of section 9 from axis 3 is from 1080 to 1085 mm, and the width of section 9 is from 270 to 272 mm from the axis 11 with angles of turns α between sections 9 and 10 of the longitudinal wall 2, constituting 30°, and the place of conjugation of sections 9 and 10 of the longitudinal wall 2 in the region of the metal receiver 14 in the cross section has an arcuate shape with a radius of curvature R equal to 700 mm from the outside of the tundish.

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