CN111570745A - Direct rolling continuous casting machine and continuous casting production line thereof - Google Patents
Direct rolling continuous casting machine and continuous casting production line thereof Download PDFInfo
- Publication number
- CN111570745A CN111570745A CN202010513530.1A CN202010513530A CN111570745A CN 111570745 A CN111570745 A CN 111570745A CN 202010513530 A CN202010513530 A CN 202010513530A CN 111570745 A CN111570745 A CN 111570745A
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- Prior art keywords
- crystallizer
- continuous casting
- direct rolling
- continuous
- casting blank
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/14—Plants for continuous casting
- B22D11/142—Plants for continuous casting for curved casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/009—Continuous casting of metals, i.e. casting in indefinite lengths of work of special cross-section, e.g. I-beams, U-profiles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/0406—Moulds with special profile
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/053—Means for oscillating the moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
- B22D11/1287—Rolls; Lubricating, cooling or heating rolls while in use
Abstract
The invention provides a direct rolling continuous casting machine and a continuous casting production line thereof, wherein the direct rolling continuous casting machine comprises a tundish, a crystallizer, a secondary cooling spraying system, a fixed section, a withdrawal and straightening machine, a hydraulic shear and a knockout roller bed which are sequentially arranged, the crystallizer is provided with a crystallizer copper pipe, and the cross section of the crystallizer copper pipe is in a regular octagon shape; the hydraulic shear can be movably arranged behind the withdrawal and straightening machine, and the advancing direction of the hydraulic shear is parallel to the pouring direction of the casting blank. The invention has the beneficial effects that the regular octagonal crystallizer copper pipe is adopted, so that the casting blank is solidified into the regular octagonal casting blank, the temperature difference value of the corner part and the surface center temperature of the regular octagonal casting blank in the subsequent solidification process is smaller than the temperature difference value of the regular quadrilateral conventional casting blank, the remaining defects of the corner part can be greatly weakened in the subsequent steel rolling process, the safety of the shearing point can be ensured by arranging the movable hydraulic shear, and the problem of shearing the liquid core casting blank can be avoided.
Description
Technical Field
The invention relates to the field of continuous casting production, in particular to a direct rolling continuous casting machine and a continuous casting production line thereof.
Background
At present, a continuous casting billet adopted by hot rolling production of building materials is added after being cooled in a pile mode and then enters a steel rolling or hot conveying production mode, and the hot conveying is carried out by pulling out the continuous casting billet from a continuous casting machine, conveying the continuous casting billet to a heating furnace of a steel rolling workshop through a hot conveying roller way for heating, and then conveying the continuous casting billet to a rolling mill for high-temperature rolling. The two production modes need to carry out secondary heating on the blank, thereby not only increasing the investment on heating equipment and fuel, increasing the production cost such as energy consumption and manpower, but also increasing the loss of metal and occupying larger area. In recent years, a direct rolling mode, that is, a production mode in which direct hot feeding of a continuous casting slab in a heating furnace is eliminated to perform rolling, has been developed, and this production mode can save energy, reduce consumption, reduce discharge of the heating furnace, and reduce oxidation burning loss, but has some problems, for example, a corner of a rectangular casting slab is low in temperature, and a defect is left in a rolled material at a low temperature after rolling.
Disclosure of Invention
The invention provides a straight rolling continuous casting machine and a continuous casting production line thereof, which aim to reduce corner defects.
The technical scheme adopted by the invention for solving the technical problems is as follows: a direct rolling continuous casting machine comprises a tundish, a crystallizer, a secondary cooling spraying system, a fixed section, a tension leveler, a hydraulic shear and a knockout roller bed which are arranged in sequence, wherein the crystallizer is provided with a crystallizer copper pipe, and the cross section of the crystallizer copper pipe is in a regular octagon shape; the hydraulic shear can be movably arranged behind the withdrawal and straightening machine, and the advancing direction of the hydraulic shear is parallel to the pouring direction of the casting blank.
Further, along the ejection direction of the crystallizer, the inner diameter of the copper pipe of the crystallizer is gradually reduced.
Furthermore, the range of the set value of the taper of the copper pipe of the crystallizer is 1.2-1.3%/m.
Furthermore, the length range value of the crystallizer copper tube is 900-1200 mm.
Furthermore, the side length range value of the cross section of the crystallizer copper pipe is 68-76 mm.
Furthermore, the casting blank has a solidification point position, and the tangent point of the hydraulic shear and the casting blank is 450mm to 550mm behind the solidification point position.
Furthermore, the spraying pressure range of the secondary cooling spraying system is 1.2-2.5 MPa.
Further, the intermediate tank is connected with the crystallizer through a submerged nozzle.
Further, the straight rolling continuous casting machine also comprises a crystallizer vibration device, and the crystallizer vibration device is connected with the crystallizer.
The invention also provides a continuous casting production line which comprises the ladle hoisting assembly and the direct rolling continuous casting machine, wherein the ladle hoisting assembly is matched with the tundish and can inject molten steel into the tundish.
The invention has the beneficial effects that the regular octagonal crystallizer copper pipe is adopted, so that the casting blank is solidified into the regular octagonal casting blank, the temperature difference value of the corner part and the surface center temperature of the regular octagonal casting blank in the subsequent solidification process is smaller than the temperature difference value of the regular quadrilateral conventional casting blank, the remaining defects of the corner part can be greatly weakened in the subsequent steel rolling process, the safety of the shearing point can be ensured by arranging the movable hydraulic shear, and the problem of shearing the liquid core casting blank can be avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, 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 structural view of a tundish and a submerged nozzle according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a hydraulic shears according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a withdrawal and straightening machine according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a mold and a mold oscillating device 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. a secondary cold spray system; 6. casting blanks; 7. a fixed section; 8. a withdrawal and straightening machine; 9. hydraulic shearing; 10. and (4) a knockout roller way.
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 embodiments with reference to the attached drawings.
As shown in fig. 1 to 5, an embodiment of the present invention provides a direct rolling continuous casting machine, which includes a tundish 1, a crystallizer 3, a secondary cold spray system 5, a fixing section 7, a withdrawal and straightening unit 8, a hydraulic shear 9 and a knockout roller table 10, which are sequentially arranged, wherein the crystallizer 3 has a crystallizer copper pipe, and the cross section of the crystallizer copper pipe is regular octagon; the hydraulic shears 9 is movably arranged behind the withdrawal and straightening unit 8, and the advancing direction of the hydraulic shears 9 is parallel to the pouring direction of the casting blank 6.
The regular octagonal crystallizer copper pipe is adopted, so that the casting blank is solidified into the regular octagonal casting blank, the temperature difference value between the corner temperature and the surface center temperature of the regular octagonal casting blank in the subsequent solidification process is smaller than the temperature difference value of the regular quadrilateral conventional casting blank, the remaining defects of the corner can be greatly weakened in the subsequent steel rolling process, the safety of the shearing point can be guaranteed by arranging the movable hydraulic shear 9, and the problem of shearing the liquid core casting blank can be avoided.
In the embodiment of the invention, along the knockout direction of the crystallizer 3, namely the vertical downward direction in figure 1, the inner diameter of the copper tube of the crystallizer is gradually reduced and is in an inverted cone structure (in order to reduce thermal resistance, improve the heat transfer performance of the crystallizer and reduce the air gap between the blank shell and the wall of the crystallizer, during design, the end surface of the lower opening of the crystallizer is smaller than the end surface of the upper opening, so that an inverted cone is formed, namely the inverted cone of the crystallizer).
Specifically, the arc radius of the casting blank 6 is R9 m-R11 m, the length range value of the crystallizer copper pipe is 900-1200 mm, effective cooling and supporting strength can be improved, the pulling speed and the service life of the crystallizer copper pipe can be improved, and friction between the crystallizer copper pipe and a solidified casting blank can be reduced. The range value of the set taper value of the crystallizer copper pipe is 1.2-1.3%/m. By adopting the taper, the casting blank can be uniformly solidified in the crystallizer 3, and the steel leakage is reduced. Side length (positive) of cross section of copper tube of crystallizerThe length of each side of the octagon) is 68-76 mm, and the area of the octagonal casting blank with the side length is 150 × 150-165 × 165mm2Area of the cross section of the quadrangular casting blank. Therefore, the temperature difference between the corner temperature and the surface center temperature of the regular octagonal casting blank in the subsequent solidification process is smaller than that of the regular quadrilateral casting blank, so that the problem of corner residual defects is greatly reduced.
In the embodiment of the invention, the secondary cold spray system 5 is arranged at the fixed section 7, the secondary cold spray system 5 is cooled by spray water, and the spray pressure range of the secondary cold spray system 5 is 1.2-2.5 Mpa. The spray pressure is set in this range in order to ensure sufficient cooling of the cast slab by the secondary cooling spray system 5. When the two-cold spraying system works, a casting blank is cooled by the two-cold spraying system 5 and then enters the tension leveler 8 through the fixing section 7, enters the hydraulic shear 9 for cutting after the tension leveler 8 performs tension leveling operation, and is conveyed to a set position from the ejection roller table 10.
Specifically, the casting blank 6 has a solidification point position, and the point of contact between the hydraulic shear 9 and the casting blank 6 is 450mm to 550mm behind the solidification point position in the casting direction of the casting blank 6. The hydraulic shears 9 can move in the casting direction (horizontal direction in fig. 1) and move back and forth according to different pulling speeds to find the optimal shearing point.
The hydraulic shear of the conventional continuous casting machine is fixed in position, the maximum drawing speed is the optimal shearing point, and for low drawing speed, the casting blank solidifying point has a certain distance from the hydraulic shear, so that the temperature is highest when the cut sizing blank cannot be guaranteed. By the hydraulic shears 9 being movable in relation to a range of pull rates, it is ensured that the optimal shear point can be achieved within a range of pull rates. In order to ensure the safety of the shearing point and avoid the occurrence of shearing liquid core casting blank, the optimal shearing point is defined as 500mm behind the solidifying point in the embodiment.
It should be noted that the production pulling speed in the embodiment of the invention is 3.5-4.5 m/min.
The casting blank 6 cut by the hydraulic shears 9 is conveyed to a steel rolling position through a blank discharging roller way 10 at a high speed (200-300 m/min) for heating-free rolling. The cast slab 6 produced by this embodiment can ensure a small temperature difference between the slab corner and the slab surface center and a high surface temperature.
As shown in fig. 1, the tundish 1 is connected to the mold 3 via a submerged entry nozzle 2. The straight rolling continuous casting machine also comprises a crystallizer vibration device 4, and the crystallizer vibration device 4 is connected with the crystallizer 3. Here, the submerged entry nozzle 2 and the mould oscillating device 4 are of the same construction as the corresponding devices of the prior art and are not described in detail by the applicant.
The invention also provides a continuous casting production line, which comprises a steel ladle hoisting assembly and the direct rolling continuous casting machine, wherein the tundish 1 above the direct rolling continuous casting machine can be matched with the steel ladle hoisting assembly of the continuous casting production line, the steel ladle hoisting assembly can inject molten steel into the tundish 1, and the knockout roller table 10 of the direct rolling continuous casting machine can be matched with the steel rolling position of the continuous casting production line.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the regular octagonal crystallizer copper pipe is adopted, so that the casting blank is solidified into the regular octagonal casting blank, the temperature difference value between the corner temperature and the surface center temperature of the regular octagonal casting blank in the subsequent solidification process is smaller than the temperature difference value of the regular quadrilateral conventional casting blank, the remaining defects of the corner can be greatly weakened in the subsequent steel rolling process, the safety of the shearing point can be guaranteed by arranging the movable hydraulic shear, and the problem of shearing the liquid core casting blank can be avoided.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features, the technical schemes and the technical schemes can be freely combined and used.
Claims (10)
1. A direct rolling continuous casting machine comprises a tundish (1), a crystallizer (3), a secondary cold spraying system (5), a fixed section (7), a tension leveler (8), a hydraulic shear (9) and a knockout roller table (10) which are arranged in sequence,
the crystallizer (3) is provided with a crystallizer copper pipe, and the cross section of the crystallizer copper pipe is in a regular octagon shape;
the hydraulic shear (9) is movably arranged behind the withdrawal and straightening machine (8), and the advancing direction of the hydraulic shear (9) is parallel to the pouring direction of the casting blank (6).
2. Continuous straight-rolling mill according to claim 1, characterized in that the internal diameter of the crystallizer copper tube is gradually reduced in the direction of the ejection of the crystallizer (3).
3. The direct rolling continuous casting machine according to claim 2, wherein the set value range of the taper of the crystallizer copper tube is 1.2-1.3%/m.
4. The direct rolling continuous casting machine according to claim 2, wherein the length of the crystallizer copper tube ranges from 900 mm to 1200 mm.
5. The continuous direct rolling caster according to claim 1, wherein the side length of the cross section of the crystallizer copper tube ranges from 68 mm to 76 mm.
6. Continuous casting straight mill according to claim 1, characterized in that the cast strand (6) has a solidification point position, the point of tangency of the hydraulic shear (9) with the cast strand (6) being located 450mm to 550mm behind the solidification point position.
7. The continuous direct rolling caster according to claim 1, characterized in that the spraying pressure of the secondary cooling spraying system (5) ranges from 1.2 Mpa to 2.5 Mpa.
8. Continuous direct rolling mill according to claim 1, characterized in that the tundish (1) and the mould (3) are connected by a submerged entry nozzle (2).
9. Continuous straight-rolling machine according to claim 1, characterized in that it further comprises a crystallizer vibration device (4), said crystallizer vibration device (4) being connected to said crystallizer (3).
10. A continuous casting line comprising a ladle hoisting assembly and a continuous direct rolling caster, characterized in that the continuous direct rolling caster is the continuous direct rolling caster of any one of claims 1 to 9, the ladle hoisting assembly is fitted with the tundish (1) and is capable of injecting molten steel into the tundish (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010513530.1A CN111570745A (en) | 2020-06-08 | 2020-06-08 | Direct rolling continuous casting machine and continuous casting production line thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010513530.1A CN111570745A (en) | 2020-06-08 | 2020-06-08 | Direct rolling continuous casting machine and continuous casting production line thereof |
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| Publication Number | Publication Date |
|---|---|
| CN111570745A true CN111570745A (en) | 2020-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010513530.1A Pending CN111570745A (en) | 2020-06-08 | 2020-06-08 | Direct rolling continuous casting machine and continuous casting production line thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112247093A (en) * | 2020-10-10 | 2021-01-22 | 河钢股份有限公司承德分公司 | Method for manufacturing continuous casting billet for direct rolling |
-
2020
- 2020-06-08 CN CN202010513530.1A patent/CN111570745A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112247093A (en) * | 2020-10-10 | 2021-01-22 | 河钢股份有限公司承德分公司 | Method for manufacturing continuous casting billet for direct rolling |
| CN112247093B (en) * | 2020-10-10 | 2022-04-12 | 河钢股份有限公司承德分公司 | Method for manufacturing continuous casting billet for direct rolling |
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