CN211360593U - Continuous casting system for polygonal casting blank - Google Patents
Continuous casting system for polygonal casting blank Download PDFInfo
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- CN211360593U CN211360593U CN201922206429.7U CN201922206429U CN211360593U CN 211360593 U CN211360593 U CN 211360593U CN 201922206429 U CN201922206429 U CN 201922206429U CN 211360593 U CN211360593 U CN 211360593U
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Abstract
The utility model provides a continuous casting system of polygon casting blank, include: a crystallizer component; the movable section is arranged at the downstream of the crystallizer component, the cross section of the movable section is in a regular polygon shape, the number of the sides of the regular polygon is an even number which is larger than or equal to that of the regular polygon, the movable section comprises a plurality of rolling support units and a plurality of nozzle units which are arranged at intervals along the advancing direction of a casting blank, and a nozzle unit is arranged between every two adjacent rolling support units; and the ejection assembly is arranged at the downstream of the movable section. The beneficial effects of the utility model are that, through setting up the movable section, can produce the casting blank of many deformations to support the casting blank through a plurality of rolling supporting element and move to downstream device, above-mentioned a plurality of nozzle units can be at the casting blank in-process spray cooling medium that marchs, cools off the casting blank, the embodiment of the utility model provides a can solve the casting blank and can not be at the rolling problem of the rolling big reduction of rolling initial stage, avoid causing the relatively poor defect of casting blank internal quality.
Description
Technical Field
The utility model relates to a steelmaking continuous casting's in the steel production field, concretely relates to continuous casting system of polygon casting blank.
Background
With the development of the steel industry, users have more and more demands on the types of steel products, and the requirements on the quality of the products are higher and higher. The demand for high-end large-size rolled stock is increased, the rolled stock quality needs to be ensured, a large rolling compression ratio is needed, and then a larger continuous casting blank is needed, and a large rod with the diameter of more than 250mm and a blank with the compression ratio of more than 4.5 can not use a rectangular blank, but generally use a large round blank or a die casting blank. Due to the shape and solidification characteristics of the large round billet, the internal quality is poor, rolling with large rolling reduction cannot be carried out due to the round shape in the early rolling stage, the crushing efficiency of columnar crystal equiaxial crystals and columnar crystals is low, the internal quality of a large rod rolled by the round billet is not good, and the internal quality can be improved only by increasing the compression ratio. The square billet can be rolled under large reduction in the first few passes, the rolling penetration force of the large reduction is good, and equiaxed crystals and columnar crystals are easy to break. The die casting blank can be larger in size and can be used for producing larger large rods, but the die casting production yield is low, and raw materials and energy are not saved.
SUMMERY OF THE UTILITY MODEL
The utility model provides a continuous casting system of polygon casting blank to reach the purpose that can produce many deformation blanks.
The utility model provides a technical scheme that its technical problem adopted is: a system for continuously casting a polygonal billet, comprising: a crystallizer component; the movable section is arranged at the downstream of the crystallizer component, the cross section of the movable section is in a regular polygon shape, the number of the sides of the regular polygon is an even number which is larger than or equal to that of the regular polygon, the movable section comprises a plurality of rolling support units and a plurality of nozzle units which are arranged at intervals along the advancing direction of a casting blank, and a nozzle unit is arranged between every two adjacent rolling support units; and the ejection assembly is arranged at the downstream of the movable section.
Furthermore, a plurality of long rollers and a plurality of short rollers are arranged in each rolling supporting unit along the circumferential direction, and one short roller is arranged between every two adjacent long rollers.
Further, each of the rolling support units has a plurality of inner surfaces, each of which is mounted with one long roller or one short roller.
Further, long rolls and short rolls at the same positions of the plurality of rolling support units are alternately arranged in the traveling direction of the cast slab.
Furthermore, a plurality of nozzles are arranged in each nozzle unit, the number of the nozzles is the same as the number of the sides of the regular polygon, and the nozzles correspond to the sides of the regular polygon one by one.
Furthermore, the continuous casting system of polygon casting blank still includes the canned paragraph, and the head end and the movable segment of canned paragraph are connected, and the tail end of canned paragraph is provided with the end and stirs electrically.
Furthermore, the continuous casting system of the polygonal casting blank also comprises a withdrawal and straightening machine and a knockout roller bed, wherein the head end of the withdrawal and straightening machine is connected with the tail end of the fixed section; the head end of the knockout roller bed is connected with the tail end of the withdrawal and straightening machine.
Further, a fire cutting machine is arranged at the tail end of the knockout roller way.
Further, the crystallizer assembly comprises: the crystallizer comprises a tundish, an immersion nozzle and a crystallizer, wherein the tundish is arranged at the upstream position of the crystallizer and is connected with the crystallizer through the immersion nozzle.
The beneficial effects of the utility model are that, through setting up the movable section, can produce the casting blank of many deformations to support the casting blank through a plurality of rolling supporting element and move to downstream device, above-mentioned a plurality of nozzle units can be at the casting blank in-process spray cooling medium that marchs, cools off the casting blank, the embodiment of the utility model provides a can solve the casting blank and can not be at the rolling problem of the rolling big reduction of rolling initial stage, avoid causing the relatively poor defect of casting blank internal quality.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic sectional view taken along line A-A of an active segment according to an embodiment of the present invention;
FIG. 3 is a schematic sectional view taken along line B-B of an active segment according to an embodiment of the present invention;
fig. 4 is a schematic C-C sectional view of an active segment according to an embodiment of the present invention.
Reference numbers in the figures: 1. an intermediate tank; 2. an immersion nozzle; 3. a crystallizer; 4. a crystallizer vibration device; 5. electrically stirring the crystallizer; 6. an active segment; 601. a long roll; 602. a short roll; 603. a nozzle; 7. a fixed section; 8. electrically stirring the tail end; 9. a withdrawal and straightening machine; 10. a knockout roller bed; 11. fire cutting machine.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1, the embodiment of the present invention provides a continuous casting system for a polygonal casting blank, which includes a mold assembly, a movable section 6 and a knockout assembly. The movable section 6 is arranged at the downstream of the crystallizer component, the cross section of the movable section 6 is in a regular polygon shape, the number of sides of the regular polygon is an even number which is larger than or equal to 6, the movable section 6 comprises a plurality of rolling supporting units and a plurality of nozzle units which are arranged at intervals along the advancing direction of the casting blank, and one nozzle unit is arranged between every two adjacent rolling supporting units. The ejection assembly is arranged downstream of the active section 6.
Through setting up movable section 6, can produce the casting blank of many deformations to support the casting blank through a plurality of rolling supporting element and move to downstream device, above-mentioned a plurality of nozzle units can be at the casting blank in-process spray cooling medium that marchs, cools off the casting blank, the embodiment of the utility model provides a can solve the casting blank and can not cool off at rolling initial stage heavy reduction rolling problem, avoid causing the relatively poor defect of casting blank internal quality.
The embodiment of the utility model provides an in, the selection of the size of polygon casting blank and limit number adopts following method: according to the requirements of large bar blankThe diameter of the inscribed circle is generally 600-950 mm, which is equivalent to
The round billet can be rolled according to the rolling ratio of 4.5
In order to facilitate the drawing of the polygonal cast billet by the withdrawal straightening machine, the application of soft reduction and the facilitation of rolling, the number of polygonal sides is selected to be even, and the number of sides is usually 6, 8 and 10. According to the section range, the radius of the continuous casting machine is selected from R16 m-R18 m.
The crystallizer assembly comprises: the crystallizer comprises a tundish 1, a submerged nozzle 2 and a crystallizer 3, wherein the tundish 1 is arranged at the upstream position of the crystallizer 3, and the tundish 1 is connected with the crystallizer 3 through the submerged nozzle 2.
Specifically, as shown in fig. 1, in the production process of the polygonal casting blank, molten steel flows into a tundish 1 from a ladle, the tundish 1 is provided with an induction heating device, impurities in the molten steel can be reduced and the temperature of the molten steel can be kept constant through induction heating, the temperature can be controlled to be positive or negative 2 ℃ of a target value, the superheat degree of the molten steel in the tundish 1 is controlled to be 20-24 ℃, and the constant temperature and the molten steel with few impurities can improve the internal quality of the polygonal casting blank.
Molten steel enters the crystallizer 3 through the submerged nozzle 2, the crystallizer 3 is in a copper pipe form, the polygonal corners are in a fillet shape to prevent corner cracking, the fillet radius is R14-R22 mm, and the inverted taper of the crystallizer 3 is 0.9-1.1%/m. The water flow rate of the crystallizer 3 is controlled to be 7-8 m/s, and the corresponding water amount is controlled to be 200-300 m3The temperature rise of water is controlled to be 3-4 ℃, and the specific water amount of secondary cooling water is controlled to be 0.1-015L/kg. A crystallizer vibration device 4 is arranged below the crystallizer 3, a crystallizer electric stirrer 5 is arranged outside the crystallizer 3, when the dummy bar is pulled out of the crystallizer 3 (the production pulling speed is controlled to be 0.14-0.4 m/min), the crystallizer electric stirrer 5 is started to start stirring for homogenizing the temperature of molten steel and improving the surface quality and the internal quality of a casting blank, the crystallizer electric stirrer 5 is continuously stirred, the frequency is 2-3 Hz, and the current is 150-300A.
A plurality of long rollers 601 and a plurality of short rollers 602 are arranged in each rolling support unit along the circumferential direction, and one short roller 602 is arranged between two adjacent long rollers 601. And each rolling support unit has a plurality of inner surfaces each of which is mounted with one long roller 601 or one short roller 602. That is, the movable section 6 has long rollers 601 or short rollers 602 on each side of the polygon for supporting the casting blank and preventing the casting blank from being fixed, and for the convenience of arrangement, a plurality of long rollers 601 and a plurality of short rollers 602 in each supporting unit all adopt the alternative arrangement form of long and short rollers in the circumferential direction, so as to avoid the problem that the roller bearing seat interferes after all the long rollers 601 are selected for use, and simultaneously avoid the problem that the support is insufficient when all the short rollers 602 are selected for use.
As shown in fig. 1 to 3, long rollers 601 and short rollers 602 at the same positions of the plurality of rolling support units are alternately arranged in the traveling direction of the cast slab. Taking the outer arc rollers as an example, the outer arc first row long rollers 601, second row short rollers 602, third row long rollers 601, fourth row short rollers 602. If the same position of two adjacent rolling support units adopts long roller 601, the bearing seats can interfere with each other, and if the same position of two adjacent rolling support units adopts short roller 602, the support can be insufficient, so that marks are left on the casting blank. The embodiment of the utility model provides a can guarantee to support enough and can not take place adjacent roll supporting element mutual interference's problem.
As shown in fig. 4, a plurality of nozzles 603 are provided in each nozzle unit, the number of nozzles 603 is the same as the number of sides of the regular polygon, and the plurality of nozzles 603 correspond to the plurality of sides of the regular polygon one by one. The nozzle 603 can spray a cooling medium to the cast slab to cool the cast slab. The nozzle 603 is provided in such a manner that each surface of the cast slab can be cooled, thereby improving the cooling effect.
The continuous casting system of polygon casting blank still includes canned paragraph 7, and canned paragraph 7's head end is connected with movable segment 6, and canned paragraph 7's tail end is provided with the end and stirs 8 electrically. The casting blank enters a fixed section 7 after passing through the movable section 6, and the fixed section 7 is an air cooling section. Be equipped with terminal electricity on the fixed segment 7 and stir 8, terminal electricity stirs 8 and is used for improving the internal quality of casting blank, and terminal electricity stirs 8 and adopts the form of stirring in turn, and corotation 10 ~ 16s stops for 2 ~ 5s, then reverses 10 ~ 16 s. The stirring frequency is 6-8 Hz, and the current is 300-600A.
The continuous casting system of the polygonal casting blank further comprises a withdrawal and straightening machine 9 and a knockout roller table 10, wherein the head end of the withdrawal and straightening machine 9 is connected with the tail end of the fixed section 7; the head end of the knockout roller table 10 is connected with the tail end of the withdrawal and straightening unit 9. The tail end of the ejection roller way 10 is provided with a flame cutting machine 11.
The casting blank is electrically stirred 8 from the tail end and then enters a withdrawal and straightening machine 9, and the withdrawal and straightening machine 9 has a soft reduction function and can carry out soft reduction on the polygonal casting blank so as to improve the internal quality of the polygonal casting blank. The pressing interval under light pressure is 0.3-0.9, and the pressing amount is 14-25 mm. A billet discharging roller way 10 is arranged behind the withdrawal straightening machine 9, and a flame cutting machine 11 is arranged above the billet discharging roller way 10 and used for cutting off a casting blank. The cut casting blank is off-line on a discharging roller way 10 through a crown block or other facilities.
The utility model also provides a continuous casting process of polygon casting blank, the continuous casting system who adopts foretell polygon casting blank operates, and the continuous casting process of polygon casting blank includes following step:
step 20, conveying the casting blank to a downstream device through the rolling support assembly of the movable section 6, and cooling the casting blank through the nozzle assembly in the conveying process;
step 30, cooling the casting blank in air through the fixed section 7, and simultaneously starting the end electric stirring 8 to stir the casting blank alternately;
step 40, the casting blank enters a withdrawal and straightening machine 9 for straightening operation, and the casting blank is conveyed to a blank discharging roller way 10 after the straightening operation is finished;
and step 50, cutting the casting blank through the flame cutting machine 11, and conveying the cut casting blank to be off-line.
Specifically, in step 10, molten steel flows into the tundish 1 from the ladle, the tundish 1 is provided with an induction heating device, impurities in the molten steel can be reduced and the temperature of the molten steel can be kept constant through induction heating, the temperature can be controlled to be plus or minus 2 ℃, the superheat degree of the molten steel in the tundish 1 is controlled to be 20-24 ℃, and the constant temperature molten steel with few impurities can improve the internal quality of the polygonal casting blank. Molten steel enters the crystallizer 3 through the submerged nozzle 2, the crystallizer 3 is in a copper pipe form, the polygonal corners are in a fillet shape to prevent corner cracking, the fillet radius is R14-R22 mm, and the inverted taper of the crystallizer 3 is 0.9-1.1%/m. The water flow rate of the crystallizer 3 is controlled to be 7-8 m/s, the corresponding water amount is controlled to be 200-300 m3/h, the water temperature is controlled to be 3-4 ℃, and the specific water amount of secondary cooling water is controlled to be 0.1-015L/kg. A crystallizer vibration device 4 is arranged below the crystallizer 3, a crystallizer electric stirrer 5 is arranged outside the crystallizer 3, when the dummy bar is pulled out of the crystallizer 3 (the production pulling speed is controlled to be 0.14-0.4 m/min), the crystallizer electric stirrer 5 is started to start stirring for homogenizing the temperature of molten steel and improving the surface quality and the internal quality of a casting blank, the crystallizer electric stirrer 5 is continuously stirred, the frequency is 2-3 Hz, and the current is 150-300A. From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: through setting up movable section 6, can produce the casting blank of many deformations to support the casting blank through a plurality of rolling supporting element and move to downstream device, above-mentioned a plurality of nozzle units can be at the casting blank in-process spray cooling medium that marchs, cools off the casting blank, the embodiment of the utility model provides a can solve the casting blank and can not cool off at rolling initial stage heavy reduction rolling problem, avoid causing the relatively poor defect of casting blank internal quality.
The above description is only for the specific embodiments of the present invention, and the scope of the present invention can not be limited by the embodiments, so that the replacement of the equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention should still belong to the scope covered by the present patent. In addition, the utility model provides an between technical feature and the technical feature, between technical feature and the technical scheme, all can the independent assortment use between technical scheme and the technical scheme.
Claims (9)
1. A system for continuously casting a polygonal billet, comprising:
a crystallizer component;
the movable section (6) is arranged at the downstream of the crystallizer component, the cross section of the movable section (6) is in a regular polygon shape, the number of sides of the regular polygon is an even number which is more than or equal to 6, the movable section (6) comprises a plurality of rolling support units and a plurality of nozzle units which are arranged at intervals along the advancing direction of a casting blank, and one nozzle unit is arranged between every two adjacent rolling support units;
an ejection assembly arranged downstream of the active section (6).
2. The continuous casting system for the polygonal casting slab according to claim 1, wherein a plurality of long rolls (601) and a plurality of short rolls (602) are arranged in each rolling support unit along the circumferential direction, and one short roll (602) is arranged between two adjacent long rolls (601).
3. The continuous casting system of a polygonal casting slab according to claim 2, wherein each rolling support unit has a plurality of inner surfaces, and each inner surface is installed with one long roll (601) or one short roll (602).
4. The continuous casting system of a polygonal casting slab according to claim 2, wherein the long rolls (601) and the short rolls (602) at the same position of the plurality of rolling support units are alternately arranged in the traveling direction of the casting slab.
5. The system for continuously casting a polygonal casting block according to claim 1, wherein a plurality of nozzles (603) are provided in each nozzle unit, the number of the nozzles (603) is the same as the number of sides of the regular polygon, and the plurality of nozzles (603) are in one-to-one correspondence with the plurality of sides of the regular polygon.
6. The continuous casting system of a polygonal casting slab according to any one of claims 1 to 5, further comprising a fixed segment (7), wherein the head end of the fixed segment (7) is connected with the movable segment (6), and the tail end of the fixed segment (7) is provided with a terminal electric stirrer (8).
7. The continuous casting system for the polygonal casting blank according to claim 6, further comprising a withdrawal and straightening machine (9) and a run-out table (10), wherein the head end of the withdrawal and straightening machine (9) is connected with the tail end of the fixed section (7); the head end of the knockout roller way (10) is connected with the tail end of the withdrawal and straightening machine (9).
8. The system for the continuous casting of polygonal billets in accordance with claim 7, characterised in that the end of the run-out table (10) is provided with a flame cutter (11).
9. The system for continuous casting of polygonal billets according to claim 6, wherein said crystallizer assembly comprises: the crystallizer comprises a middle tank (1), a submerged nozzle (2) and a crystallizer (3), wherein the middle tank (1) is arranged at the upstream position of the crystallizer (3), and the middle tank (1) is connected with the crystallizer (3) through the submerged nozzle (2).
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| CN201922206429.7U CN211360593U (en) | 2019-12-10 | 2019-12-10 | Continuous casting system for polygonal casting blank |
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| CN201922206429.7U CN211360593U (en) | 2019-12-10 | 2019-12-10 | Continuous casting system for polygonal casting blank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110773712A (en) * | 2019-12-10 | 2020-02-11 | 中冶京诚工程技术有限公司 | Continuous casting system and continuous casting process for polygonal casting blank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110773712A (en) * | 2019-12-10 | 2020-02-11 | 中冶京诚工程技术有限公司 | Continuous casting system and continuous casting process for polygonal casting blank |
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