CN110814307A - Method and equipment for producing large-fillet or large-chamfer continuous casting square billet/rectangular billet - Google Patents
Method and equipment for producing large-fillet or large-chamfer continuous casting square billet/rectangular billet Download PDFInfo
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- CN110814307A CN110814307A CN201911200958.4A CN201911200958A CN110814307A CN 110814307 A CN110814307 A CN 110814307A CN 201911200958 A CN201911200958 A CN 201911200958A CN 110814307 A CN110814307 A CN 110814307A
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title abstract description 15
- 238000005096 rolling process Methods 0.000 claims abstract description 66
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 26
- 239000010959 steel Substances 0.000 claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000005266 casting Methods 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims description 20
- 238000006073 displacement reaction Methods 0.000 claims description 18
- 238000003825 pressing Methods 0.000 claims description 8
- 230000009467 reduction Effects 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 5
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
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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
- B22D11/16—Controlling or regulating processes or operations
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Abstract
The invention provides a method and equipment for producing a large-fillet or large-chamfer continuous casting square billet/rectangular billet, belonging to the technical field of metallurgy. The method comprises the steps of casting high-temperature molten steel into a square billet or a rectangular billet in a forced cooling mode in a continuous casting machine, guiding a continuous casting red billet through a straightener by an ingot guide rod, enabling the head of the red billet to enter a position between an upper roller and a lower roller of a continuous casting red billet corner rolling device arranged at the downstream of the straightener, enabling at least the corner of the red billet to be in contact with the upper roller and the lower roller, and rolling the red billet to enable the shape of the corner of a casting blank to be changed from sharp to smooth so as to form the square billet or the rectangular billet with a large fillet or a. According to the invention, by utilizing the high plasticity characteristic of the continuous casting red blank, the arc radius of the corner part is increased after rolling, and the blank is closer to the target rolling property, so that the deformation of the corner part in later rolling is reduced, and the defects of cracks, folding and the like during rolling are reduced. During the rolling process, the red billet can partially fill the defects of corner cracks, looseness and the like generated during the continuous casting process.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a continuous casting process of steel, and particularly relates to a method and equipment for producing a large-fillet or large-chamfer continuous casting square billet/rectangular billet.
Background
The liquid high-temperature molten steel is directly cast into square or rectangular billets with certain section specifications by adopting forced cooling, and then the square or rectangular billets are sent to a rolling mill to be rolled into steel products. The radius of the fillet of the crystallizer used for continuously casting the small square billet with the size less than or equal to 160mm multiplied by 160mm is only R6-R10; the fillet of the crystallizer used for the bloom with the continuous casting size of more than or equal to 240mm multiplied by 240mm is about R20 mm. In the continuous casting process, the corners of the casting are easy to generate internal stress and have poor plasticity due to rapid cooling.
Therefore, the corner of a common round steel billet is the part with the highest cooling speed in the steel rolling process, the temperature of the steel at the corner is much lower than that of the face and the core in the steel rolling process, the temperature of the steel at the corner is about 100 ℃ lower than that of the steel at the face in the rough rolling stage in actual production, plastic deformation is uneven due to uneven temperature on each section, rolling cracks can occur at the corner of the steel billet with the worst plasticity, and the rolling cracks become main factors influencing the quality of high-quality steel, so that grinding procedures are needed to be added at the corner of the steel billet after grinding of the steel billet, the corner of the steel billet becomes blunt and large, the risk of rolling cracks is reduced, the labor cost, the cost of easily-consumed parts such as grinding wheels and the like, the loss of the steel billet and the like are increased, and the production period is also prolonged.
In the prior art, the problem of corner crack defects of large square billets is mostly solved by adjusting or controlling material components, cooling modes and using a cylindrical crystallizer with round corners for continuous casting. For example, in chinese patent application CN108687315A, "method for producing 22CrMo gear steel by bloom continuous casting", on the basis of electromagnetic stirring of a crystallizer, an electromagnetic stirring device is additionally arranged between a secondary cooling zone and a solidification end, and the installation positions and working parameters of the secondary cooling zone and the solidification end are reasonably designed, and then the superheat degree, the pouring speed, the cooling parameters and the like of the pouring molten steel are controlled, so that the compactness and the homogeneity of the bloom 22CrMo gear steel continuous casting billet with the size of 360mm × 450mm of the billet cross section are improved. In addition, by designing the fillet parameters of the tubular crystallizer, the fillet size of the fillet crystallizer is R20mm, the cooling of the corner of the casting blank is optimized, and the defect control of the corner of the casting blank is improved. Through the improvement of the cooling water path, the heat transfer uniformity is ensured, and the thickness of the casting blank shell at the outlet of the crystallizer is uniform. But the method cannot effectively eliminate the defect of poor plasticity of the corner of the square billet.
Disclosure of Invention
Aiming at the prior art, the invention provides a method and equipment for producing a large-fillet or large-chamfer continuous casting square billet/rectangular billet, wherein the radius of an arc at the corner of a continuous casting red billet is increased after the corner is lightly rolled and lightly pressed, so that the defects of cracks, folding and the like during the subsequent steel rolling are favorably reduced, the defects of cracks, looseness and the like at the corner can be partially overcome by lightly rolling and lightly pressing, and the method and the equipment have positive significance for improving the product quality.
In order to solve the problems, the technical scheme of the invention is as follows:
a method for producing continuous casting square or rectangular billet with large fillet or large chamfer includes such steps as forced cooling high-temp molten steel in conticaster to cast square or rectangular billet, leading the continuous casting red billet through straightener by dummy bar, passing the red billet between upper and lower rollers of corner rolling unit of continuous casting red billet, and rolling to obtain the square or rectangular billet with large fillet or large chamfer.
Furthermore, when the head of the continuous casting red billet does not enter between the upper roller and the lower roller of the continuous casting red billet corner rolling device, the upper roller and the lower roller are in an open state, and at least after the head of the continuous casting red billet penetrates through a plurality of vertical planes where the axes of the upper roller and the lower roller are located, the upper roller and the lower roller are closed to start rolling.
Furthermore, the middle positions of the upper roller and the lower roller are arc-shaped or large-chamfer-angle rectangular/square-shaped concave shapes with large chamfer angles or fillet angles, and the arc-shaped parts and the chamfer angles are contacted with the corners of the red blank in the rolling process of the red blank.
Further, the temperature of the continuous casting red blank is not lower than 800 ℃ when the continuous casting red blank is rolled.
Further, the rolling is one-time rolling or multiple-time rolling.
The production equipment for the large fillet or large chamfer continuous casting square billet/rectangular billet production method is characterized in that a continuous casting red billet corner rolling device is arranged at the downstream of a straightener, the continuous casting red billet corner rolling device comprises a rack, an upper roller, a lower roller, a roller power system and an upper roller pressing device, the upper roller and the lower roller are arranged on the rack through bearings, and the middle positions of the upper roller and the lower roller are in an inwards concave arc shape or a rectangle/square shape with a large chamfer or a fillet; the roller power system provides power for rotation of the upper roller and the lower roller, and the upper roller pressing device is a hydraulic lifting device.
Further, hydraulic pressure elevating gear still includes displacement sensor, displacement sensor is used for detecting the amount of rolling down of last roller.
Further, the displacement sensor is connected with the controller, and the controller controls the hydraulic lifting device to work according to the displacement of the upper roller detected by the displacement sensor.
Furthermore, the continuous casting red billet corner rolling devices are one or more groups.
The invention utilizes the high plasticity characteristic of the continuous casting red blank, adds a corner rolling device of the continuous casting red blank after straightening, the middle position of the upper roller and the lower roller is in an arc shape or a large chamfer rectangle/square concave shape with a large chamfer or a fillet, and the arc part and the chamfer part are contacted with the corner of the red blank in the rolling process of the red blank. After rolling, the corner of the cast billet is rolled and deformed to change the radius of the fillet from small to large or from sharp to blunt, or made into a large chamfer. The radius of the circular arc at the corner of the continuous casting red billet is increased after the corner is lightly rolled and lightly pressed, the formed billet is closer to the target rolling property, the deformation of the rolled corner at the later stage is reduced, and the defects of cracks, folding and the like during steel rolling are reduced. In addition, in the process of rolling, the red billet can partially cover the defects of corner cracks, looseness and the like caused by the fact that the corners of the square billet/rectangular billet are cooled quickly in the continuous casting process, and the method has positive significance for improving the quality of the continuously cast square billet.
Meanwhile, the equipment for the large fillet or large chamfer continuous casting square billet/rectangular billet production method is characterized in that an upper roll pressing device of a continuous casting red billet corner rolling device adopts a hydraulic lifting device, a displacement sensor is used for detecting the displacement of an upper roll, and a control system remotely controls the work of the hydraulic lifting device according to the displacement of the upper roll detected by the displacement sensor, so that the accurate control of the pressing amount of the upper roll is realized.
Drawings
FIG. 1 is a schematic view of roll rolling of a continuously cast red billet by a roll according to embodiment 1 of the continuous cast red billet corner rolling apparatus of the present invention.
FIG. 2 is a schematic view of roll rolling of a continuously cast red billet by the roll of embodiment 2 of the continuous cast red billet corner rolling apparatus of the present invention.
FIG. 3 is a schematic view of a roll rolling of a continuous cast red billet by the continuous cast red billet corner rolling apparatus of embodiment 3 of the present invention.
In the figure:
1-upper roll, 2-lower roll, 3-continuous casting red blank, 4-concave part.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
The invention relates to a method for producing a large fillet or large chamfer continuous casting square billet/rectangular billet, which comprises the steps of casting high-temperature molten steel into a square billet or rectangular billet with a certain section specification by adopting forced cooling in a continuous casting machine, guiding a continuous casting red billet 3 through a straightener by a dummy bar, then leading the head of the red billet 3 into a space between an upper roller 1 and a lower roller 2 of a continuous casting red billet 3 corner rolling device arranged at the downstream of the straightener, and rolling the red billet 3 by contacting at least the corner of the red billet 3 with the upper roller 1 and the lower roller 2 to ensure that the corner of a casting blank is changed from sharp to smooth so as to form the large fillet or large chamfer square billet or rectangular billet.
Specifically, when the head of the steel billet does not pass through the device, the roller controlled by the hydraulic cylinder is in an open state, and at least after the head of the continuous casting red billet 3 passes through a vertical plane where the axes of the upper roller 1 and the lower roller 2 are located, the roller is changed from the open state to the closed state, and rolling force is applied to the corner of the steel billet. The temperature of the continuous casting red blank 3 is not lower than 800 ℃ when the continuous casting red blank is rolled. The rolling process can be one-time rolling or multiple-time rolling.
The production equipment used in the production method of the invention is provided with a continuous casting red billet 3 corner rolling device at the downstream of a straightener of the continuous casting equipment. The continuous casting red billet 3 corner rolling devices are one group or a plurality of groups, and if the continuous casting red billet 3 corner rolling devices are a plurality of groups, the plurality of groups of rolling devices are arranged in sequence. The continuous casting red billet 3 corner rolling device comprises a rack, an upper roller 1, a lower roller 2, a roller power system and an upper roller 1 pressing device. The upper roller 1 and the lower roller 2 are arranged on the rack through bearings, the roller power system provides power for the rotation of the upper roller 1 and the lower roller 2, and the upper roller 1 pressing device is a hydraulic lifting device. The middle positions of the upper roller 1 and the lower roller 2 are concave arcs or rectangles/squares with large chamfers or round corners. Specifically, the middle positions of the upper roller 1 and the lower roller 2 are provided with concave parts 4 in various shapes, and the main purpose is to slightly press the corners of a continuous casting square billet or rectangular billet in a red billet 3 state to form large-radian arcs or large chamfers at the corners; while the sides of the square or rectangular billet remain substantially planar.
As shown in fig. 1, the concave portion 4 has an arc shape, and a gap is formed between the top of the arc-shaped concave portion 4 and the top surface or the bottom surface of the square billet/rectangular billet. During rolling, the corners of the continuous casting red blank 3 are pressed under the action of light pressure to form a large-radian arc.
The concave portion 4 has a rectangular or square shape with large rounded corners or large chamfered corners. If a gap is left between each of the four sides of the red billet 3 and the roll when the red billet 3 is in contact with the roll, the material at the corner of the red billet 3 flows to the sides at the two sides of the corner, as shown in fig. 2 and 3. If the red billet 3 is in contact with the roller, the material of the corner of the red billet 3 is slightly pressed to form a large chamfer.
In order to accurately control the rolling reduction of the upper roll 1, the hydraulic lifting device further comprises a displacement sensor, and the displacement sensor is used for detecting the rolling reduction of the upper roll 1. And the displacement sensor is connected with the controller, and the controller controls the work of the hydraulic lifting device according to the displacement of the upper roller 1 detected by the displacement sensor, so that the remote control of the work of the hydraulic lifting device is realized.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (9)
1. A method for producing a large-fillet or large-chamfer continuous casting square billet/rectangular billet is characterized in that high-temperature molten steel is cast into the square billet or rectangular billet by adopting forced cooling in a continuous casting machine, a continuous casting red billet (3) is guided by an ingot guide rod to pass through a straightener, the head of the red billet (3) enters between an upper roller (1) and a lower roller (2) of a continuous casting red billet (3) corner rolling device arranged at the downstream of the straightener, at least the corner of the red billet (3) is in contact with the upper roller (1) and the lower roller (2), and the red billet (3) is rolled, so that the shape of the corner of a casting billet is changed from sharp to smooth, and the large-fillet or large-chamfer square billet or rectangular billet is formed.
2. The method for producing the continuous casting square billet/rectangular billet with the large fillet or the large chamfer according to the claim 1, characterized in that when the head of the continuous casting red billet (3) does not enter between the upper roller (1) and the lower roller (2) of the continuous casting red billet (3) corner rolling device, the upper roller (1) and the lower roller (2) are in an open state, and at least after the head of the continuous casting red billet (3) penetrates through a vertical plane where the axes of the upper roller (1) and the lower roller (2) are located, the upper roller (1) and the lower roller (2) are closed to start rolling.
3. The method for producing a large fillet or large chamfer continuous casting square/rectangular billet according to claim 1, characterized in that the middle position of the upper roll (1) and the lower roll (2) is arc-shaped or large chamfer rectangular/square concave shape with large chamfer or fillet, and the arc-shaped and chamfer part is contacted with the corner of the red billet (3) in the rolling process of the red billet (3).
4. The method for producing a large fillet or large chamfer continuous casting square/rectangular billet as claimed in claim 1, wherein the continuous casting red billet (3) is subjected to rolling at a temperature of not less than 800 ℃.
5. The method for producing a large-fillet or large-chamfer continuously-cast square/rectangular billet according to claim 1, wherein the rolling is one-time rolling or multiple-time rolling.
6. The production equipment for the production method of claim 1 is characterized in that a continuous casting red billet (3) corner rolling device is arranged at the downstream of a straightener, the continuous casting red billet (3) corner rolling device comprises a rack, an upper roller (1), a lower roller (2), a roller power system and an upper roller (1) screw-down device, the upper roller (1) and the lower roller (2) are arranged on the rack through bearings, and the middle positions of the upper roller (1) and the lower roller (2) are in an inwards concave arc shape or a rectangle/square shape with a large chamfer angle or a fillet angle; the roller power system provides power for rotation of the upper roller (1) and the lower roller (2), and the upper roller (1) pressing device is a hydraulic lifting device.
7. A production apparatus according to claim 4, characterized in that said hydraulic lifting device further comprises a displacement sensor for detecting the amount of reduction of the upper roll (1).
8. A production plant according to claim 5, characterized in that the displacement sensor is connected to a controller, which controls the operation of the hydraulic lifting device in dependence of the displacement of the upper roll (1) detected by the displacement sensor.
9. The production plant according to claim 4, characterized in that the continuous casting red blank (3) corner rolling devices are one or more groups.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911200958.4A CN110814307A (en) | 2019-11-29 | 2019-11-29 | Method and equipment for producing large-fillet or large-chamfer continuous casting square billet/rectangular billet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911200958.4A CN110814307A (en) | 2019-11-29 | 2019-11-29 | Method and equipment for producing large-fillet or large-chamfer continuous casting square billet/rectangular billet |
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| CN110814307A true CN110814307A (en) | 2020-02-21 |
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| CN201911200958.4A Pending CN110814307A (en) | 2019-11-29 | 2019-11-29 | Method and equipment for producing large-fillet or large-chamfer continuous casting square billet/rectangular billet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102431874B1 (en) * | 2022-01-13 | 2022-08-24 | 주식회사 크로스워커스 | a rolling device for electrical contact having excellent surface quality and an electrical contact manufacturing apparatus including the same |
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| US5204508A (en) * | 1990-07-31 | 1993-04-20 | Plasma Energy Corporation | Method and apparatus for enhancing the quality of cast billets |
| CN204747439U (en) * | 2015-06-18 | 2015-11-11 | 钢铁研究总院 | Rolling device in continuous casting billet bight carries out |
| CN106077550A (en) * | 2016-08-22 | 2016-11-09 | 钢铁研究总院 | A kind of two roller continuous casting billets tilt with roll roll angle apparatus |
| CN110039021A (en) * | 2019-05-06 | 2019-07-23 | 中达连铸技术国家工程研究中心有限责任公司 | A kind of pair of continuous casting billet corner rolled it is multi-functional roll angle equipment and method |
| CN211191919U (en) * | 2019-11-29 | 2020-08-07 | 江苏永钢集团有限公司 | Production equipment for producing large fillet or large chamfer continuous casting square billet/rectangular billet |
-
2019
- 2019-11-29 CN CN201911200958.4A patent/CN110814307A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5204508A (en) * | 1990-07-31 | 1993-04-20 | Plasma Energy Corporation | Method and apparatus for enhancing the quality of cast billets |
| CN204747439U (en) * | 2015-06-18 | 2015-11-11 | 钢铁研究总院 | Rolling device in continuous casting billet bight carries out |
| CN106077550A (en) * | 2016-08-22 | 2016-11-09 | 钢铁研究总院 | A kind of two roller continuous casting billets tilt with roll roll angle apparatus |
| CN110039021A (en) * | 2019-05-06 | 2019-07-23 | 中达连铸技术国家工程研究中心有限责任公司 | A kind of pair of continuous casting billet corner rolled it is multi-functional roll angle equipment and method |
| CN211191919U (en) * | 2019-11-29 | 2020-08-07 | 江苏永钢集团有限公司 | Production equipment for producing large fillet or large chamfer continuous casting square billet/rectangular billet |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102431874B1 (en) * | 2022-01-13 | 2022-08-24 | 주식회사 크로스워커스 | a rolling device for electrical contact having excellent surface quality and an electrical contact manufacturing apparatus including the same |
| KR20230109538A (en) * | 2022-01-13 | 2023-07-20 | 주식회사 크로스워커스 | a rolling device for electrical contact having excellent surface quality and an electrical contact manufacturing apparatus including the same |
| KR102560256B1 (en) | 2022-01-13 | 2023-07-28 | 주식회사 크로스워커스 | a rolling device for electrical contact having excellent surface quality and an electrical contact manufacturing apparatus including the same |
| KR20230113717A (en) * | 2022-01-13 | 2023-08-01 | 주식회사 크로스워커스 | a rolling device for electrical contact having excellent surface quality and an electrical contact manufacturing apparatus including the same |
| KR102624182B1 (en) | 2022-01-13 | 2024-01-15 | 주식회사 크로스워커스 | a rolling device for electrical contact having excellent surface quality and an electrical contact manufacturing apparatus including the same |
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