CN114406012A - Method for reducing transverse cracks at head and tail of rolled piece by medium plate steckel mill - Google Patents
Method for reducing transverse cracks at head and tail of rolled piece by medium plate steckel mill Download PDFInfo
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- CN114406012A CN114406012A CN202210060495.1A CN202210060495A CN114406012A CN 114406012 A CN114406012 A CN 114406012A CN 202210060495 A CN202210060495 A CN 202210060495A CN 114406012 A CN114406012 A CN 114406012A
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- Prior art keywords
- rolled piece
- tail
- head
- rolling
- pass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/72—Rear end control; Front end control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B43/00—Cooling beds, whether stationary or moving; Means specially associated with cooling beds, e.g. for braking work or for transferring it to or from the bed
- B21B43/003—Transfer to bed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/06—Removing local distortions
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a method for reducing transverse cracks at the head and the tail of a rolled piece by a medium plate steckel mill, which relates to the technical field of steel production. The head and tail warping and buckling heads are leveled by the empty passage, the cooling speed of descaling water for the head and tail warping and buckling heads during fine descaling is effectively reduced, the temperature difference between the head and the tail of a rolled piece and a body is reduced, the increase of the head and the tail rolling force is reduced, the smooth running and equipment safety of the production of a rolling mill are ensured, and the generation of transverse cracks at the head and the tail of the rolled piece is effectively reduced.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to a method for reducing transverse cracks at the head and the tail of a rolled piece by a medium plate steckel mill.
Background
In the production process of hot rolling medium and heavy plates, process personnel pertinently select the components and the heating temperature of a rolled piece, whether to adopt controlled rolling, whether to adopt on-line quenching water cooling and other processes according to the requirements of customers on the final performance of the rolled piece. Aiming at the working procedures of a rolling mill, the production is organized usually by adopting a TMCP (temperature controlled cold rolling) mode, the head and the tail of a rolled piece are faster than the temperature drop speed of a body due to the cooling effects of cooling water leakage in the rolling mill area, rough/fine descaling water spray and the like in the rolling mill during the rolling process of the rolled piece, the rolling force is changed along with the temperature change of the length direction of the rolled piece during the rolling process, the head and the tail of the rolled piece can be warped or buckled, and after the temperature control of the rolled piece subjected to temperature controlled rolling is finished, the secondary oxidation on the surface of the rolled piece and the falling foreign matters are usually removed by adopting two fine descaling processes. Because of the reason of the buckle head of the rolled piece, when the descaling water is sprayed, the time acting on the head and the tail of the rolled piece is longer than that of the flat rolled piece, the cooling speed of the head and the tail is increased, the rolling force of the head and the tail is 1000-3000 tons larger than that of the body during rolling, transverse cracks are generated due to the low-temperature rolling of the head and the tail of the rolled piece, even the rolling mill is stopped quickly (equipment is stopped), and the risk of equipment damage exists when the non-planning is generated.
In the prior art, a roll gap is mostly decreased on a hot rolled steel plate production line one pass by one pass according to a rolling schedule, and finally the required rolled piece thickness is obtained. The rolled piece is because of surface temperature difference from top to bottom in the rolling mill reciprocal rolling in-process, there is the phenomenon of upwarping or withholding when leading to the rolled piece head and the tail to go out the rolling mill, upwarping or the risk that the part easily leads to colliding the equipment and having the foreign matter to impress and heavy skin production down, strike the cooling for a long time of upwarping or withholding part through finish rolling descaling water to the head and the tail, the head and the tail is very big than rolled piece body temperature difference, between the big 1000 ~ 3000 tons of head and the tail rolling force of rolling time head and the tail, the rolled piece head and the tail low temperature rolling leads to the production of transverse crack, lead to the fact rolled piece head and the tail to process hardening simultaneously, be unfavorable for the control of rolled piece final product quality and mechanical properties.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides a method for reducing the transverse cracks at the head and the tail of a rolled piece by a medium plate steckel mill.
The technical scheme of the invention is further defined as follows:
according to the method for reducing transverse cracks at the head and the tail of the rolled piece for the medium plate steckel mill, the thickness h +/-2-3 mm of the rolled piece in the reference temperature control pass is set for the secondary roll gap of the empty passageway.
In the method for reducing the transverse cracks at the head and the tail of the rolled piece by the medium plate steckel mill, the empty pass is set to be two passes.
According to the method for reducing the transverse cracks at the head and the tail of the rolled piece by the medium plate steckel mill, the rolled piece passes through the mill from the front to the back to level the tail of the rolled piece, and then passes through the mill from the back to the front to level the head of the rolled piece.
After the last pass is finished, the rolled piece is cut by flying shears, cooled by laminar flow and straightened by a hot straightening machine, then cooled by a cooling bed, and cut into finished product sizes by a finishing line according to the requirements of customer orders and put in storage.
The invention has the beneficial effects that: the stability and controllability of TMCP (temperature control controlled cold rolling) production are ensured, compared with the traditional control mode, the head and tail buckle warping heads are leveled through the idle pass, the cooling speed of descaling water on the head and tail buckle warping heads during fine descaling is effectively reduced, the temperature difference between the head and the tail of a rolled piece and a body is reduced, the increase of head and tail rolling force is reduced, the smooth running and equipment safety of rolling mill production are ensured, and the generation of transverse cracks at the head and the tail of the rolled piece is effectively reduced. The stability of the head, middle and tail performance of the steel plate is improved, the saving cost of the subsequent strong cold straightening and flattening can be saved, the unplanned improvement is reduced, and the contract exchange rate is improved.
Drawings
FIG. 1 is a schematic diagram of a conventional rolling process of a rolling mill;
FIG. 2 is a schematic view of a roll gap control mode during idle passing of the rolling mill according to the present invention;
wherein: 1. an upper supporting roller; 1-1, a lower supporting roller; 2. an upper work roll; 2-1, a lower working roll; 3. a fine descaling nozzle is arranged; 3-1, arranging a fine descaling nozzle; 4. and (5) rolling pieces.
Detailed Description
According to the method for reducing the transverse cracks at the head and the tail of the rolled piece for the medium plate steckel mill, when the rolling mill adopts TMCP (temperature controlled cold rolling) to produce the rolled piece with the length of 20mm, the two-stage process requires that the thickness of the finished product is controlled to 960 ℃ by 2.6 times, and the total number of the finished product is 11.
The thickness h =20mm × 2.6=52mm in the controlled temperature pass, the 7 th pass controlled rolling is set by the program, 2 passes of idle pass are added before the controlled rolling pass, the controlled rolling starts to be carried out for the 9 th pass in the rolling pass, and 13 passes of production are counted.
As shown in fig. 2, when the thickness of the rolled piece 4 reaches 52mm in the 6 th pass after rolling, the roll gaps of the 7 th pass and the 8 th pass are idle pass, the roll gap of the working roll 2/2-1 is set to be h +/-2-3 mm with reference to the rolled piece thickness of the temperature control pass, namely 52 +/-2-3 mm, and the roll gap of the 7 th pass and the roll gap of the 8 th pass are set to be 54mm, the rolled piece 4 passes through the rolling mill from the front of the rolling mill to the back of the rolling mill and then flattens the tail of the rolled piece, passes through the rolled piece from the back of the rolling mill to the front of the rolling mill and then returns to the temperature control area in front of the rolling mill to measure the temperature, when the temperature reaches the temperature required by the temperature control, the rolled piece 4 enters the rolling mill to start the descaling 3/3-1 of the finish rolling pass and then enters the subsequent production of the finish rolling pass. After finishing the 13 th pass of rolling, the rolled piece is cut by a flying shear, cooled by laminar flow, straightened by a hot straightener, cooled by a cooling bed, cut into finished product size by a finishing line according to the requirement of a customer order and put in storage.
The head and tail warping and buckling heads are leveled by the empty passage, the cooling speed of descaling water for the head and tail warping and buckling heads during fine descaling is effectively reduced, the temperature difference between the head and the tail of a rolled piece and a body is reduced, the increase of the head and the tail rolling force is reduced, the smooth running and equipment safety of the production of a rolling mill are ensured, and the generation of transverse cracks at the head and the tail of the rolled piece is effectively reduced.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (5)
1. A method for reducing transverse cracks of the head and the tail of a rolled piece by a medium plate steckel mill is characterized by comprising the following steps: when TMCP is adopted for production, a plurality of pass idle pass passes are added in the temperature control pass, when a rolled piece passes through a rolling mill, the rolling mill performs leveling passes on the head and tail warping buckling head part of the rolled piece, forward and reverse corresponding passes are performed to ensure that the head and the tail parts achieve the purpose of leveling, the rolled piece returns to a temperature control area in front of the rolling mill, and when the temperature reaches a set temperature control temperature, the descaling of the finish rolling pass is started, and the rolling pass production is carried out.
2. The method for reducing the occurrence of transverse head and tail cracks of a rolled piece of a medium plate steckel mill according to claim 1, characterized in that: and setting the thickness h +/-2-3 mm of the rolled piece in the reference temperature control pass at the secondary roll gap of the empty passageway.
3. The method for reducing the occurrence of transverse head and tail cracks of a rolled piece of a medium plate steckel mill according to claim 1, characterized in that: the number of empty passes is set to two.
4. The method for reducing the occurrence of transverse head and tail cracks of a rolled piece of a medium plate steckel mill according to claim 3, characterized in that: the rolled piece passes through the rolling mill from the front of the rolling mill to the machine and then the tail of the rolled piece is leveled, and then the rolled piece passes through the machine from the rear of the machine to the front of the machine and then the head of the rolled piece is leveled.
5. The method for reducing the occurrence of transverse head and tail cracks of a rolled piece of a medium plate steckel mill according to claim 1, characterized in that: after the last pass of rolling, the rolled piece is sheared by flying shears, cooled by laminar flow, straightened by a hot straightening machine, cooled by a cooling bed, sheared into finished product size by a finishing line according to the requirement of a customer order and stored.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210060495.1A CN114406012A (en) | 2022-01-19 | 2022-01-19 | Method for reducing transverse cracks at head and tail of rolled piece by medium plate steckel mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210060495.1A CN114406012A (en) | 2022-01-19 | 2022-01-19 | Method for reducing transverse cracks at head and tail of rolled piece by medium plate steckel mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114406012A true CN114406012A (en) | 2022-04-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210060495.1A Pending CN114406012A (en) | 2022-01-19 | 2022-01-19 | Method for reducing transverse cracks at head and tail of rolled piece by medium plate steckel mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114406012A (en) |
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2022
- 2022-01-19 CN CN202210060495.1A patent/CN114406012A/en active Pending
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