CN107199242B - Large-scale steel rolling production system and method - Google Patents
Large-scale steel rolling production system and method Download PDFInfo
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- CN107199242B CN107199242B CN201710498618.9A CN201710498618A CN107199242B CN 107199242 B CN107199242 B CN 107199242B CN 201710498618 A CN201710498618 A CN 201710498618A CN 107199242 B CN107199242 B CN 107199242B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/0805—Flat bars, i.e. having a substantially rectangular cross-section
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The invention discloses a large-scale steel rolling production system and method, comprising a first horizontal two-roller reversible cogging mill system and a second horizontal two-roller reversible cogging mill system which are arranged in series, wherein the first horizontal two-roller reversible cogging mill system and the second horizontal two-roller reversible cogging mill system are connected to form a continuous rolling relationship, and 8-11 continuous rolling units are arranged behind the second horizontal two-roller reversible cogging mill system in series; the invention overcomes the defects and the shortages of the large-scale steel rolling production technology in the prior art, has reasonable process layout, reduces energy consumption, is environment-friendly, is easy to produce, operate and maintain, reduces production cost and is easy to control product quality.
Description
Technical Field
The invention relates to a large-scale steel rolling production system and method.
Background
According to the production scale and the complexity of the product section, a steel rolling production line is generally provided with 1-2 horizontal two-roll reversible cogging mills (1 BD/1BD+1BD), rectangular or special-shaped section continuous casting billets are firstly subjected to reciprocating reversible multi-pass single-machine rolling to roll the rectangular or special-shaped section continuous casting billets into middle billets with proper sections, then the middle billets are sent to a downstream 3-frame reversible continuous rolling mill set (1 universal/horizontal two-roll interchange roughing mill U/HR+1 horizontal two-roll edging mill E+1 universal/horizontal two-roll interchange finishing mill U/HF), and finally the qualified large-scale steel products are obtained through reciprocating reversible multi-pass three-frame continuous rolling.
The production scale is not large, the product section is relatively simple, generally, 1 horizontal two-roll reversible cogging mill (1 BD) is arranged, a pushing bed and a hook type tilting device are arranged in front and behind the cogging mill and used for guiding rolled pieces to enter a hole type correctly, steel tilting operation is carried out when necessary, and rectangular or special-shaped section continuous casting blanks are firstly subjected to 5-9 times of reciprocating reversible single-machine rolling on the horizontal two-roll reversible cogging mill and then are sent to a downstream 3-frame reversible continuous rolling unit (1U/HR+1E+1U/HF) to be subjected to 5-9 times of reciprocating reversible three-frame continuous rolling until qualified large-scale steel products are rolled.
As shown in figure 1, when the production scale is large or the product cross section is complex, in order to meet the production capacity requirement, the existing large-scale steel rolling production technology is provided with 2 horizontal two-roll reversible cogging mills (1BD+1BD) which are arranged in a tracking way, a push bed and a hook type tilting device are arranged before and after each cogging mill and are used for guiding rolled pieces to enter a hole type correctly, if necessary, steel tilting operation is carried out, rectangular or special-shaped section continuous casting blanks are firstly subjected to 5-7 times of reciprocating single-machine rolling on a No. 1 horizontal two-roll reversible cogging mill, then subjected to 3-5 times of reciprocating single-machine rolling on a No. 2 horizontal two-roll reversible cogging mill, and then sent to a downstream 3-frame reversible continuous rolling mill (1U/HR+1E+1U/HF) for continuous rolling, and intermediate blanks are subjected to reciprocating reversible 5-9 times of three-frame continuous rolling on the 3-frame reversible continuous rolling mill (1U/HR+1E+1U/HF) to finally obtain qualified large-scale steel products.
The arrangement mode of the 1-2 horizontal two-roll reversible cogging mill (1 BD/1BD+1BD) +3 rack reversible continuous rolling mill (1U/HR+1E+1U/HF) meets the production requirement of large-scale steel rolling, but rectangular or special-shaped section continuous casting blanks need to be subjected to 5-12 times of reciprocating single-machine rolling by the 1-2 horizontal two-roll reversible cogging mill (1 BD/1BD+1BD), and then subjected to 5-9 times of reciprocating three-rack continuous rolling by the downstream 3 rack reversible continuous rolling mill (1U/HR+1E+1U/HF), so that the large-scale steel products can be finally rolled, and the large-scale steel production technology has the following defects and disadvantages:
(1) The rolling period of rolling the continuous casting blank with the rectangular or special-shaped section into a large-sized steel product is long, the temperature of a rolled piece is reduced greatly, and the continuous casting blank with the rectangular or special-shaped section is required to be heated in a heating furnace at high temperature, so that the energy consumption of the heating furnace is increased, the oxidation burning loss of the continuous casting blank is increased, and the carbon dioxide emission of the heating furnace is also increased;
(2) In the process of reciprocal and reversible tandem rolling of a 3-frame reversible tandem rolling unit (1U/HR+1E+1U/HF), the roll gaps of all rolling mills are required to be continuously regulated, so the requirements on the manufacturing precision of the rolling mill body, corresponding matched hydraulic facilities, an electric control system, production operation, maintenance and the like are extremely high, and if the operation regulation or the system maintenance is improper, the production quality of large-scale steel products is difficult to ensure;
(3) The special X-H hole type system adopted by the 3-frame reversible tandem rolling unit (1U/HR+1E+1U/HF) causes high roller consumption and high production cost.
Disclosure of Invention
Aiming at the problems, the invention provides a large-scale steel rolling production system and method with reasonable process layout and easy production operation.
In order to achieve the purpose, the large-scale steel rolling production system comprises a first horizontal two-roller reversible cogging mill system and a second horizontal two-roller reversible cogging mill system which are arranged in series, wherein the first horizontal two-roller reversible cogging mill system and the second horizontal two-roller reversible cogging mill system are connected to form a continuous rolling relationship, and 8-11 continuous rolling units are arranged behind the second horizontal two-roller reversible cogging mill system in series.
Preferably, the first horizontal two-roller reversible cogging mill system comprises a first horizontal two-roller reversible cogging mill, a first cogging mill front working roller way and a first cogging mill front extension roller way which are sequentially arranged in front of the first horizontal two-roller reversible cogging mill, and a first cogging mill front pushing bed and a hook type steel turning device are arranged on the side face of the first cogging mill front working roller way;
the second horizontal two-roller reversible cogging mill system comprises a second horizontal two-roller reversible cogging mill, a second cogging mill rear working roller way and a second cogging mill rear extension roller way which are sequentially arranged behind the second horizontal two-roller reversible cogging mill, and a second cogging mill rear pushing bed and a hook type steel tilting device are arranged on the side face of the second cogging mill rear working roller way.
Preferably, an intermediate billet conveying roller way, a head cutting hot saw, a front lifting working roller way of the continuous rolling unit and a rolled piece centering device are sequentially arranged between the second cogging mill rear extension roller way and the continuous rolling unit; the continuous rolling unit comprises 3-6 universal/horizontal two-roll exchange rolling mills, 1 edging/horizontal two-roll exchange rolling mill, 2 universal/horizontal two-roll exchange rolling mills, 1 edging/horizontal two-roll exchange rolling mill and 1 universal/horizontal two-roll exchange rolling mill which are sequentially arranged; the continuous rolling unit is also provided with a cooling bed input variable frequency roller way.
In order to achieve the above purpose, the invention provides a large-scale steel rolling production method, which comprises the following steps:
1) Transporting the rectangular or special-shaped section continuous casting blank to a front working roller way of a first cogging mill and guiding a correct centering hole pattern through a front pushing bed of the first cogging mill;
2) The front working roller way of the first cogging mill, the first horizontal two-roller reversible cogging mill and the second horizontal two-roller reversible cogging mill are operated forward, and rectangular or abnormal section continuous casting blanks are sequentially fed into the first horizontal two-roller reversible cogging mill and the second horizontal two-roller reversible cogging mill for carrying out 1 st-pass double-rack continuous rolling;
3) Stopping the rolled piece after rolling in the step 2) on a working roller way behind a second cogging mill and guiding a correct centering hole pattern through a push bed behind the second cogging mill;
4) The second cogging mill back working roller way, the second horizontal two-roller reversible cogging mill and the first horizontal two-roller reversible cogging mill are operated reversely, and rolled pieces are sequentially sent into the second horizontal two-roller reversible cogging mill and the first horizontal two-roller reversible cogging mill to carry out 2 nd-pass double-rack continuous rolling;
5) The rolled piece after rolling in the step 4) is stopped on a working roller way before a first cogging mill, a correct centering hole pattern is guided by a front pushing bed of the first cogging mill, and the operation of the step 2) is repeated to perform 3 rd-pass double-rack continuous rolling on the rolled piece;
6) The rolled piece after rolling in the step 5) is stopped on a working roller way behind a second cogging mill, and the correct centering hole type is guided by a push bed behind the second cogging mill, and the operations of the step 4) to the step 5) are sequentially and circularly carried out until a rectangular or special-shaped section continuous casting blank is rolled into an intermediate blank with a proper section;
7) And (3) conveying the intermediate blank rolled in the step (6) into 8-11 continuous rolling units for continuous rolling.
Preferably, the step 1) and the step 3) further comprise a steel turning operation for the continuous casting billet or the rolled piece.
Preferably, the step 1) is preceded by heating the rectangular or special-shaped section continuous casting blank and removing the primary iron oxide scale by a high-pressure water descaling device.
Preferably, the step 2) and the step 4) further include the steps of: and adjusting the roll gap of the rolling mill according to the preset rolling reduction by the first horizontal two-roll reversible cogging mill and the second horizontal two-roll reversible cogging mill.
Preferably, the step 7) further includes the steps of: cutting off irregular heads from the intermediate blank in the step 6);
the step 7) specifically comprises the following steps:
the intermediate blank is sequentially sent into 3-6 universal/horizontal two-roll exchange rolling mills, 1 edging/horizontal two-roll exchange rolling mill, 2 universal/horizontal two-roll exchange rolling mills, 1 edging/horizontal two-roll exchange rolling mill and 1 universal/horizontal two-roll exchange rolling mill to be continuously rolled into qualified large-sized steel after being transported, lifted and centered, and the rolled large-sized steel is sent to a cooling bed to be cooled.
The invention overcomes the defects and shortcomings of adopting 1-2 horizontal two-roll reversible cogging mill and 3-frame reversible tandem mill in the production technology of large-scale steel rolling in the background technology, has reasonable process layout, reduces energy consumption, is environment-friendly, is easy to produce, operate and maintain, reduces production cost and is easy to control product quality.
Drawings
FIG. 1 is a plan view of a region of a horizontal two-roll reversible cogging mill and a 3-stand reversible tandem mill with 2 track-laying chess arrangements in the background art;
FIG. 2 is a schematic diagram of the overall connection of the large-scale steel rolling production system of the present invention;
FIG. 3 is a schematic diagram of the connection between a first horizontal two-roll reversible cogging mill system and a second horizontal two-roll reversible cogging mill system in the large-scale steel rolling production system of the present invention;
FIG. 4 is a schematic diagram of the connection of a tandem rolling mill train in the large-scale steel rolling production system of the invention;
the components in the area plane layout diagram of the horizontal two-roll reversible cogging mill and the 3-frame reversible continuous rolling mill with the 2-frame tracking cloth chess arrangement in the figure 1, the front extension roller way of the cogging mill No. 1 and No. 1, the front working roller way of the cogging mill No. 2 and No. 1, the front push bed of the cogging mill No. 3 and the hook type steel tilting device, the horizontal two-roll reversible cogging mill No. 4 and No. 1, the rear push bed of the cogging mill No. 5 and the hook type steel tilting device, the rear working roller way of the cogging mill No. 6 and No. 1, the rear extension roller way of the cogging mill No. 7 and No. 1, the rear transverse steel shifting machine of the cogging mill No. 8 and No. 1, the front extension roller way of the cogging mill No. 9 and No. 2, the front working roller way of the cogging mill No. 10 and No. 2, the front push bed of the cogging mill No. 11 and the hook type steel tilting device, the device comprises a 12 # horizontal two-roll reversible cogging mill, a 13 # horizontal two-roll reversible cogging mill, a 2 # cogging mill rear pushing bed, a hook type steel tilting device, a 14 # cogging mill rear working roll table, a 15 # cogging mill rear extending roll table, a 16 # cogging mill rear transverse steel shifting machine, a 17 # 3-frame reversible continuous rolling mill front extending roll table, a 18 # 3-frame reversible continuous rolling mill front lifting working roll table, a 19 # 3-frame reversible continuous rolling mill front centering device, a 20 # 3-frame reversible continuous rolling mill (1U/HR+1E+1U/HF), a 21 # 3-frame reversible continuous rolling mill rear centering device, a 22 # 3-frame reversible continuous rolling mill rear lifting working roll table, a 23 # 3-frame reversible continuous rolling mill rear extending roll table.
Detailed Description
The invention is further described below with reference to the drawings.
Example 1
As shown in fig. 2, the large-scale steel rolling production system comprises a first horizontal two-roller reversible cogging mill system and a second horizontal two-roller reversible cogging mill system which are arranged in series, wherein the first horizontal two-roller reversible cogging mill system and the second horizontal two-roller reversible cogging mill system are connected to form a continuous rolling relationship, and 8-11 continuous rolling units 212 are arranged behind the second horizontal two-roller reversible cogging mill system in series.
As shown in fig. 3, the first horizontal two-roll reversible cogging mill system includes a first horizontal two-roll reversible cogging mill 204, and a first cogging mill front working roller table 202 and a first cogging mill front extension roller table 201 which are sequentially arranged in front of the first horizontal two-roll reversible cogging mill 204, wherein a first cogging mill front push bed 203 and a hook type tilting device are arranged on the side surface of the first cogging mill front working roller table 202;
the second horizontal two-roller reversible cogging mill system comprises a second horizontal two-roller reversible cogging mill 205, a second cogging mill rear working roller way 206 and a second cogging mill rear extension roller way 208 which are sequentially arranged behind the second horizontal two-roller reversible cogging mill 205, and a second cogging mill rear pushing bed 207 and a hook type tilting device are arranged on the side face of the second cogging mill rear working roller way 206.
As shown in fig. 4, an intermediate billet transportation roller way 209, a head cutting hot saw, a front lifting working roller way 210 of the continuous rolling unit and a rolled piece centering device 211 are sequentially arranged between the second cogging mill rear extension roller way 208 and the continuous rolling unit 212; the continuous rolling mill set 212 comprises 3 to 6 universal/horizontal two-roll exchanging rolling mills, 1 edging/horizontal two-roll exchanging rolling mill, 2 universal/horizontal two-roll exchanging rolling mills, 1 edging/horizontal two-roll exchanging rolling mill and 1 universal/horizontal two-roll exchanging rolling mill which are sequentially arranged; the tandem mill 212 is also provided with a cooling bed input variable frequency roller way.
Transporting the rectangular or special-shaped section continuous casting blank to a first cogging mill front working roller way 202 and guiding a correct centering hole type through a first cogging mill front pushing bed 203; the front working roller way 202 of the first cogging mill, the first horizontal two-roller reversible cogging mill 204 and the second horizontal two-roller reversible cogging mill 205 are operated forward, and rectangular or abnormal section continuous casting blanks are sequentially fed into the first horizontal two-roller reversible cogging mill and the second horizontal two-roller reversible cogging mill for carrying out 1 st-pass double-rack continuous rolling; the rolled piece is stopped on a second cogging mill rear working roller way 206 and guided to a correct centering hole type by a second cogging mill rear pushing bed 207; the second cogging mill rear working roller way 206, the second horizontal two-roller reversible cogging mill 205 and the first horizontal two-roller reversible cogging mill 204 are operated reversely, and rolled pieces are sequentially fed into the second horizontal two-roller reversible cogging mill and the first horizontal two-roller reversible cogging mill for 2 nd-pass double-rack continuous rolling; the rolled rolling mill is stopped on a front working roller way 202 of the first cogging mill, and the above operations are sequentially and circularly carried out until a rectangular or special-shaped section continuous casting billet is rolled into an intermediate billet with a proper section; and then the rolled intermediate billets are conveyed into 8-11 continuous rolling units 212 for continuous rolling.
According to the embodiment, the pure rolling time for rolling the large-sized steel products from the rectangular or special-shaped section continuous casting billets is greatly shortened, the temperature drop of rolled pieces is reduced, the temperature of the continuous casting billets when being discharged out of a heating furnace and rolled is reduced, the energy consumption and the carbon dioxide emission of the heating furnace are reduced, the oxidation burning loss of the continuous casting billets is reduced, the metal yield is improved, the roller consumption is reduced, the production cost is reduced, the production efficiency of a rolling mill is improved, and the range of the large-sized steel products with thin wall specifications is widened.
Example 2
The embodiment relates to a large-scale steel rolling production method, which comprises the following steps:
1) Transporting the rectangular or special-shaped section continuous casting blank to a first cogging mill front working roller way 202 and guiding a correct centering hole type through a first cogging mill front pushing bed 203;
2) The front working roller way 202 of the first cogging mill, the first horizontal two-roller reversible cogging mill 204 and the second horizontal two-roller reversible cogging mill 205 are operated forward, and rectangular or abnormal section continuous casting blanks are sequentially fed into the first horizontal two-roller reversible cogging mill and the second horizontal two-roller reversible cogging mill for carrying out 1 st-pass double-rack continuous rolling;
3) Stopping the rolled piece after rolling in the step 2) on a second cogging mill rear working roller way 206 and guiding a correct centering hole type through a second cogging mill rear pushing bed 207;
4) The second cogging mill rear working roller way 206, the second horizontal two-roller reversible cogging mill 205 and the first horizontal two-roller reversible cogging mill 204 are operated reversely, and rolled pieces are sequentially fed into the second horizontal two-roller reversible cogging mill and the first horizontal two-roller reversible cogging mill for 2 nd-pass double-rack continuous rolling;
5) Step 4), stopping the rolled piece after rolling on a first cogging mill front working roller way 202, guiding a correct centering hole pattern through a first reversible cogging mill front push bed 203, and repeating the operation of the step 2) to perform 3 rd-pass double-rack continuous rolling on the rolled piece;
6) Step 5) rolling the rolled piece on a second cogging mill rear working roller way 206, guiding a correct centering hole type through a second cogging mill rear pushing bed 207, and sequentially and circularly performing the operations of the steps 4) to 5) until a rectangular or special-shaped section continuous casting blank is rolled into an intermediate blank with a proper section;
7) And (3) conveying the intermediate billet rolled in the step 6) into 8-11 continuous rolling units 212 for continuous rolling.
Example 3
Based on the description of the embodiment 2, the step 1) and the step 3) in this embodiment further include turning the continuous casting billet or the rolled piece.
And the step 1) is preceded by heating the rectangular or special-shaped section continuous casting blank and removing the primary oxide scale by a high-pressure water descaling device.
The steps 2) and 4) further include the following steps: the first horizontal two-roll reversible cogging mill 204 and the second horizontal two-roll reversible cogging mill 205 are adjusted in rolling mill roll gap according to a predetermined reduction.
The step 7) further comprises the following steps: cutting off irregular heads from the intermediate blank in the step 6).
The step 7) specifically comprises the following steps:
the intermediate blank is sequentially sent into 3-6 universal/horizontal two-roll exchange rolling mills, 1 edging/horizontal two-roll exchange rolling mill, 2 universal/horizontal two-roll exchange rolling mills, 1 edging/horizontal two-roll exchange rolling mill and 1 universal/horizontal two-roll exchange rolling mill to be continuously rolled into qualified large-sized steel after being transported, lifted and centered, and the rolled large-sized steel is sent to a cooling bed to be cooled.
According to the embodiment, the pure rolling time for rolling the large-sized steel products from the rectangular or special-shaped section continuous casting billets is greatly shortened, the temperature drop of rolled pieces is reduced, the temperature of the continuous casting billets when being discharged out of a heating furnace and rolled is reduced, the energy consumption and the carbon dioxide emission of the heating furnace are reduced, the oxidation burning loss of the continuous casting billets is reduced, the metal yield is improved, the roller consumption is reduced, the production cost is reduced, the production efficiency of a rolling mill is improved, and the range of the large-sized steel products with thin wall specifications is widened.
The present invention is not limited to the above embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be defined by the claims.
Claims (5)
1. A large-scale steel rolling production method is characterized in that: the method is carried out by adopting a large-scale steel rolling production system;
the system comprises a first horizontal two-roller reversible cogging mill system and a second horizontal two-roller reversible cogging mill system which are arranged in series, wherein the first horizontal two-roller reversible cogging mill system and the second horizontal two-roller reversible cogging mill system are connected to form a continuous rolling relationship, and 8-11 continuous rolling units are arranged behind the second horizontal two-roller reversible cogging mill system in series;
the first horizontal two-roller reversible cogging mill system comprises a first horizontal two-roller reversible cogging mill, a first cogging mill front working roller way and a first cogging mill front extension roller way which are sequentially arranged in front of the first horizontal two-roller reversible cogging mill, and a first cogging mill front pushing bed and a hook type steel tilting device are arranged on the side face of the first cogging mill front working roller way;
the second horizontal two-roller reversible cogging mill system comprises a second horizontal two-roller reversible cogging mill, a second cogging mill rear working roller way and a second cogging mill rear extension roller way which are sequentially arranged behind the second horizontal two-roller reversible cogging mill, and a second cogging mill rear pushing bed and a hook type steel tilting device are arranged on the side face of the second cogging mill rear working roller way;
an intermediate billet conveying roller way, a head cutting hot saw, a front lifting working roller way of the continuous rolling unit and a rolled piece centering device are sequentially arranged between the second cogging mill rear extension roller way and the continuous rolling unit; the continuous rolling unit comprises 3-6 universal/horizontal two-roll exchange rolling mills, 1 edging/horizontal two-roll exchange rolling mill, 2 universal/horizontal two-roll exchange rolling mills, 1 edging/horizontal two-roll exchange rolling mill and 1 universal/horizontal two-roll exchange rolling mill which are sequentially arranged; the cooling bed input variable frequency roller way is arranged behind the continuous rolling unit;
the method comprises the following steps:
1) Transporting the rectangular or special-shaped section continuous casting blank to a front working roller way of a first cogging mill and guiding a correct centering hole pattern through a front pushing bed of the first cogging mill;
2) The front working roller way of the first cogging mill, the first horizontal two-roller reversible cogging mill and the second horizontal two-roller reversible cogging mill are operated forward, and rectangular or abnormal section continuous casting blanks are sequentially fed into the first horizontal two-roller reversible cogging mill and the second horizontal two-roller reversible cogging mill for carrying out 1 st-pass double-rack continuous rolling;
3) Stopping the rolled piece after rolling in the step 2) on a working roller way behind a second cogging mill and guiding a correct centering hole pattern through a push bed behind the second cogging mill;
4) The second cogging mill back working roller way, the second horizontal two-roller reversible cogging mill and the first horizontal two-roller reversible cogging mill are operated reversely, and rolled pieces are sequentially sent into the second horizontal two-roller reversible cogging mill and the first horizontal two-roller reversible cogging mill to carry out 2 nd-pass double-rack continuous rolling;
5) Stopping the rolled piece after rolling in the step 4) on a working roller way before a first cogging mill, guiding a correct centering hole pattern through a front pushing bed of the first cogging mill, and repeating the operation of the step 2) to perform 3 rd-pass double-rack continuous rolling on the rolled piece;
6) The rolled piece after rolling in the step 5) is stopped on a working roller way behind a second cogging mill, and is guided to correctly center the hole pattern through a push bed behind the second cogging mill, and the operations of the step 4) to the step 5) are sequentially and circularly carried out until a continuous casting billet with a rectangular or special-shaped section is rolled into an intermediate billet with a proper section;
7) And (3) conveying the intermediate blank rolled in the step (6) into 8-11 continuous rolling units for continuous rolling.
2. A method of producing a large steel strip according to claim 1, wherein: and the step 1) and the step 3) also comprise the step of turning the steel of the continuous casting blank or the rolled piece.
3. A method of producing a large steel strip according to claim 1, wherein: and the step 1) is preceded by heating the rectangular or abnormal section continuous casting blank and removing the primary oxide scale by a high-pressure water descaling device.
4. A method of producing a large steel strip according to claim 1, wherein: the steps 2) and 4) further include the following steps: and adjusting the roll gap of the rolling mill according to the preset rolling reduction by the first horizontal two-roll reversible cogging mill and the second horizontal two-roll reversible cogging mill.
5. A method of producing a large steel strip according to claim 1, wherein: the step 7) further comprises the following steps: cutting off irregular heads from the intermediate blank in the step 6);
the step 7) specifically comprises the following steps:
and (3) conveying the intermediate blank into 3-6 universal/horizontal two-roll exchange rolling mills, 1 edging/horizontal two-roll exchange rolling mill, 2 universal/horizontal two-roll exchange rolling mills, 1 edging/horizontal two-roll exchange rolling mill and 1 universal/horizontal two-roll exchange rolling mill in sequence after transportation, lifting and centering to continuously roll the intermediate blank into qualified large-sized steel, and conveying the rolled large-sized steel to a cooling bed for cooling.
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| JP2592562B2 (en) * | 1992-01-29 | 1997-03-19 | 川崎製鉄株式会社 | Rolling mill train in section steel rolling |
| JP3555289B2 (en) * | 1995-12-15 | 2004-08-18 | Ｊｆｅスチール株式会社 | Manufacturing method for section steel |
| DE19628369A1 (en) * | 1996-07-13 | 1998-01-15 | Schloemann Siemag Ag | Process for rolling finished profiles from a preliminary profile |
| DE19729991A1 (en) * | 1997-07-12 | 1999-01-14 | Schloemann Siemag Ag | Process for casting and rolling and a rolling stand arrangement for rolling finished profiles (sheet piling profiles) from a preliminary profile close to the final dimension coming from a continuous casting device |
| TW355149B (en) * | 1996-12-04 | 1999-04-01 | Schloemann Siemag Ag | A method of rolling pre-formed steel into finished steel using a roller frame device in reciprocating motion |
| CN1299843C (en) * | 2003-08-27 | 2007-02-14 | 鞍钢新轧钢股份有限公司 | Short flow path manufacturing method of heavy rail |
| CN202087575U (en) * | 2011-06-01 | 2011-12-28 | 中冶赛迪工程技术股份有限公司 | Profile steel rolling production line |
| CN106140814B (en) * | 2016-08-10 | 2018-08-28 | 中冶华天工程技术有限公司 | The big-and-middle reversible big mill of proximate matter Stand Mill |
| CN206936012U (en) * | 2017-06-27 | 2018-01-30 | 中冶华天工程技术有限公司 | Heavy section steel rolled steel production system |
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