CN112108525A - Air cooling control method for reducing temperature of rolled piece and steel rolling production line - Google Patents
Air cooling control method for reducing temperature of rolled piece and steel rolling production line Download PDFInfo
- Publication number
- CN112108525A CN112108525A CN202010978567.1A CN202010978567A CN112108525A CN 112108525 A CN112108525 A CN 112108525A CN 202010978567 A CN202010978567 A CN 202010978567A CN 112108525 A CN112108525 A CN 112108525A
- Authority
- CN
- China
- Prior art keywords
- rolled piece
- rolling
- rolled
- straightening
- mill group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
- B21B39/06—Pushing or forcing work into pass
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses an air cooling control method for reducing the temperature of a rolled piece and a steel rolling production line, wherein the method improves the technological process of rolling control and cooling control into the process of rolling by a middle rolling mill group → the rolled piece enters a transverse rack straightening toothed plate → each rolled piece finishes rolling by a finishing rolling mill group, and the rolled piece on the straightening toothed plate is stepped by one step → a steel moving trolley takes materials from the straightening toothed plate → the rolled piece is bitten into the finishing rolling mill group for rolling; setting a material taking position of the steel moving trolley according to the cooling requirement specified by the variety steel process file; the air cooling time of the rolled piece on the straightening toothed plate is controlled, so that the rolled piece is naturally cooled to the target temperature, the problems of large temperature difference of the core surface of the rolled piece, surface faceting, surface quality defects and the like caused by water cooling are avoided, and the steel running accident caused by collision of the head of the rolled piece with a nozzle is avoided.
Description
Technical Field
The invention belongs to the technical field of rolling control and cooling control, and particularly relates to an air cooling control method for reducing the temperature of a rolled piece and a steel rolling production line.
Background
The controlled rolling and controlled cooling process on a steel rolling production line is an important technical means for improving the internal structure performance of steel, and the cooling measure mainly adopted by the controlled rolling at present is through water cooling. Water cooling's equipment is a plurality of water-cooling tank usually, and every water-cooling tank has 3 ~ 4 steel passageways of crossing to the rolled piece that adapts to different specifications passes, and every crosses the steel passageway and has a plurality of nozzle to constitute again, and the water yield and the water pressure of every nozzle can be with valve regulation size and height, so that fall to required temperature with the rolled piece temperature. The process has the following defects:
(1) the water cooling is a rapid cooling mode, so that the temperature difference of the surface of the rolled piece core is large, the maximum temperature difference can reach 400 ℃ just after the rolled piece core is taken out of a water cooling box, and the temperature difference is over 90 ℃ before the rolled piece core enters a finishing mill even if the rolled piece core is returned to the temperature for a short time;
(2) the circumferential pressures of the water-cooling nozzles are different, so that the surface of a rolled piece is cooled unevenly as if the surface is a 'flower face';
(3) the inner hole of the nozzle is easy to scratch a rolled piece, so that the surface quality defect is caused;
(4) the head of a rolled piece is easy to impact a nozzle, so that a steel running accident is caused.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide an air cooling control method for reducing the temperature of a rolled piece, which aims to solve the problems of surface temperature difference and surface temperature unevenness of a water-through cooling core and easy scratching, bumping and steel running of the rolled piece.
Another object of the present invention is to provide a rolling line for carrying out the above method.
The technical scheme is as follows: the invention relates to an air cooling control method for reducing the temperature of a rolled piece, which comprises the following steps:
(1) conveying rolled pieces rolled by the middle rolling mill group into a stepping tooth type transverse moving rack for air cooling, and sequentially placing the rolled pieces according to the forward moving sequence of the straightening toothed plates, wherein one rolled piece is placed on each straightening toothed plate;
(2) controlling the stepping time of a rolled piece on the straightening toothed plate according to the rolling time of the finishing mill group, so that the rolled piece steps by one step when the finishing mill group finishes rolling one rolled piece;
(3) setting a material taking position of the steel moving trolley according to the surface reduced temperature of the rolled piece in each step and the cooling requirement specified by the variety steel;
(4) and when the finishing mill group finishes rolling one piece, the steel moving trolley takes one rolled piece from the straightening toothed plate at the material taking position and sends the rolled piece to the finishing mill group for rolling.
In the step (1), the heating furnace is controlled to balance the tapping and the rolling rhythm of the intermediate rolling mill group, and the steel moving trolley can take a rolled piece from the straightening toothed plate at the material taking position when the finishing rolling mill group finishes rolling one piece. After the rolled piece is prevented from entering the transverse moving rack, the steel moving trolley cannot take the rolled piece at the position of the preset straightening toothed plate.
In the step (2), the time for stepping the rolled pieces by one step is the sum of the pure rolling time of each rolled piece in the finishing mill group and the interval time of two rolled pieces.
The pure rolling time of each rolled piece in the finishing mill group is 90 +/-2 seconds, and the interval time between the rolled pieces is 5 +/-1 seconds.
Furthermore, six straightening toothed plates are arranged on the stepping tooth type transverse moving rack. Because the natural air cooling temperature reduction speed of the rolled piece on the straightening toothed plates is about 0.2-0.3 ℃/s, six straightening toothed plates are arranged, the air cooling time can be controlled within a large range of 95-570 seconds, the surface temperature of the step-by-step process is reduced by about 19-28.5 ℃, the maximum temperature of the six straightening toothed plates can be reduced by 114-171 ℃, the core surface temperature does not exceed 40 ℃, and the cooling requirement of most steel grades can be met.
Corresponding to the air cooling control method for reducing the temperature of the rolled piece, the steel rolling production line for implementing the method comprises a middle rolling mill group, a finishing rolling mill group and a stepping tooth-type traverse rack, wherein the stepping tooth-type traverse rack is arranged between the middle rolling mill group and the finishing rolling mill group.
And the length of the straightening toothed plate is more than or equal to that of a rolled piece rolled by the medium rolling mill set. The rolled piece that the assurance intermediate rolling mill group provided can be placed down without the segmentation to avoid influencing the accuse cold rhythm because of the segmentation.
Has the advantages that: compared with the prior art, the method improves the process flow of rolling control and cooling control into the process flow of rolling by a middle rolling mill group → the rolled piece enters a transverse moving rack straightening toothed plate → the finishing rolling mill group finishes rolling each time, the rolled piece on the straightening toothed plate is taken by one step → a steel moving trolley takes the material from the straightening toothed plate → the rolled piece is bitten into the finishing rolling mill group for rolling; setting a material taking position of the steel moving trolley according to the cooling requirement specified by the variety steel process file; the air cooling time of the rolled piece on the straightening toothed plate is controlled, so that the rolled piece is naturally cooled to the target temperature, the problems of large temperature difference of the core surface of the rolled piece, surface faceting, surface quality defects and the like caused by water cooling are avoided, and the steel running accident caused by collision of the head of the rolled piece with a nozzle is avoided.
Drawings
FIG. 1 is a process flow diagram of a steel rolling line according to the present invention;
figure 2 is a schematic view of a straightening tooth plate structure of a step tooth traversing stage employed in the method of the present invention.
Detailed Description
The present invention will be described in further detail with reference to fig. 1 and 2.
The process flow of the steel rolling production line is heating furnace heating → medium rolling → traverse rack air cooling → finish rolling, namely a stepping tooth-type traverse rack is arranged in front of a finish rolling unit and used for realizing the requirements of rolling control and cooling control.
Specifically, the technical requirements of the stepping tooth type traverse rack are as follows:
(1) the length of the straightening toothed plate 1 requires that the length of a rolled piece 10 provided by a medium rolling mill set can be placed without segmentation;
(2) the number of the straightening toothed plates 1 is set according to requirements, six teeth are preferably set for improving the adaptability of steel types, and a rolled piece 10 can be placed in each tooth;
(3) the steel moving trolley of the rack can take materials from any position of 1 st to 6 th teeth.
In actual production, the need to adjust the cooling parameters includes: the steel tapping speed of the heating furnace, the rolling rhythm of the intermediate rolling mill set, the material taking position of the steel moving trolley and the rolling speed of the finishing rolling mill set. Typically, each product 10 is rolled in the finishing train for a net rolling time of about 90 seconds with a product interval of about 5 seconds, thus setting the step by step time to 95 seconds. Through measurement and calculation, the natural air cooling temperature reduction speed of the rolled piece on the straightening tooth is about 0.2-0.3 ℃/s. When the steel moving trolley takes materials from the 1 st tooth, the air cooling time of the rolled piece is about 95s, and the surface temperature is reduced by 19-28.5 ℃; when the material taking position moves backwards by one tooth, the surface temperature is reduced by 19-28.5 ℃. When the steel moving trolley takes materials from the 6 th tooth, the air cooling time of a rolled piece is about 570s, the surface temperature can be reduced by 114-171 ℃, the temperature difference of the core surface does not exceed 40 ℃, and the surface color is uniform without the phenomenon of 'faceting'.
The air cooling control process comprises the following implementation steps:
1. setting a material taking position of the steel moving trolley according to the cooling requirement specified by the variety steel process file; and materials are taken from different straightening tooth plates 1 according to different cooling requirements.
2. Controlling the rolling rhythm of the middle rolling mill set, and simultaneously, uniformly tapping by a heating furnace to prevent the rolled piece from being missed at the position of a preset straightening tooth by a steel moving trolley after the rolled piece enters a transverse moving rack;
3. a rolled piece enters a first tooth of a straightening toothed plate of the transverse moving rack;
4. when the finishing mill group finishes rolling one piece, the stepping toothed plate carries the rolled piece to step by one step until the set material taking position of the steel moving trolley is reached;
5. and taking materials by the steel moving trolley, and transferring the materials to a finishing mill group for rolling.
Claims (10)
1. An air cooling control method for reducing the temperature of a rolled piece is characterized by comprising the following steps:
(1) conveying rolled pieces rolled by the middle rolling mill group into a stepping tooth type transverse moving rack for air cooling, and sequentially placing the rolled pieces according to the forward moving sequence of the straightening toothed plates, wherein one rolled piece is placed on each straightening toothed plate;
(2) controlling the stepping time of a rolled piece on the straightening toothed plate according to the rolling time of the finishing mill group, so that the rolled piece steps by one step when the finishing mill group finishes rolling one rolled piece;
(3) setting a material taking position of the steel moving trolley according to the surface reduced temperature of the rolled piece in each step and the cooling requirement specified by the variety steel;
(4) and when the finishing mill group finishes rolling one piece, the steel moving trolley takes one rolled piece from the straightening toothed plate at the material taking position and sends the rolled piece to the finishing mill group for rolling.
2. The air cooling control method for reducing the temperature of a rolled piece according to claim 1, wherein in the step (1), the balanced tapping of the heating furnace and the rolling rhythm of the intermediate rolling mill set are controlled, so that the steel moving trolley can take one rolled piece from the straightening toothed plate at the taking position every time the finishing rolling mill set finishes rolling one piece.
3. The air-cooling control method for reducing the temperature of a rolled piece according to claim 1, wherein in the step (2), the rolled piece is stepped by one step for the sum of the pure rolling time of each rolled piece in the finishing mill group and the interval time of two rolled pieces.
4. An air cooling control method for reducing the temperature of a rolled piece according to claim 3, wherein the pure rolling time of each rolled piece in the finishing mill group is 90 ± 2 seconds, and the interval time between the rolled pieces is 5 ± 1 seconds.
5. An air-cooling control method for reducing the temperature of a rolled piece according to claim 4, characterized in that the stepping tooth-type traverse rack is provided with six straightening tooth plates in total.
6. The air cooling control method for reducing the temperature of a rolled piece according to claim 1, wherein the length of the straightening tooth plate is more than or equal to the length of the rolled piece rolled by the intermediate rolling mill group.
7. A steel rolling production line for implementing the air cooling control method for reducing the temperature of rolled pieces according to claim 1, characterized by comprising an intermediate rolling mill group, a finishing rolling mill group and a stepping tooth-like traverse rack arranged between the intermediate rolling mill group and the finishing rolling mill group.
8. Steel rolling production line according to claim 7, characterized in that said stepped toothed traverser is provided with a total of six straightening toothed plates.
9. The steel rolling production line of claim 7, wherein the length of the straightening tooth plate is more than or equal to the length of a rolled piece rolled by the intermediate rolling mill group.
10. The rolling line of claim 7, further comprising a heating furnace disposed before the intermediate mill train.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010978567.1A CN112108525A (en) | 2020-09-16 | 2020-09-16 | Air cooling control method for reducing temperature of rolled piece and steel rolling production line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010978567.1A CN112108525A (en) | 2020-09-16 | 2020-09-16 | Air cooling control method for reducing temperature of rolled piece and steel rolling production line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112108525A true CN112108525A (en) | 2020-12-22 |
Family
ID=73803209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010978567.1A Pending CN112108525A (en) | 2020-09-16 | 2020-09-16 | Air cooling control method for reducing temperature of rolled piece and steel rolling production line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112108525A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113649421A (en) * | 2021-07-07 | 2021-11-16 | 阳春新钢铁有限责任公司 | Control system and method for temperature drop compensation of finish rolling inlet |
-
2020
- 2020-09-16 CN CN202010978567.1A patent/CN112108525A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113649421A (en) * | 2021-07-07 | 2021-11-16 | 阳春新钢铁有限责任公司 | Control system and method for temperature drop compensation of finish rolling inlet |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104826872B (en) | A kind of controlled rolling method eliminating Surfaces of Hot Rolled Strip chromatic aberration defect | |
| CN104550237B (en) | For producing the continuous casting-Direct Rolling device and method of Bar Wire Product and section bar | |
| JPH06503853A (en) | Process and plant for producing steel strip with cold-rolled properties and products obtained directly in hot-rolling lines | |
| CN205988958U (en) | A kind of wire and rod continuous casting billet is exempted from heating and is directly rolled system | |
| CN109097534B (en) | Very thin precise stainless steel strip busbar bright annealing technology | |
| CN106955896B (en) | Water tank parameter on-line tuning system and method based on rolled piece head and tail temperature difference | |
| CN112108525A (en) | Air cooling control method for reducing temperature of rolled piece and steel rolling production line | |
| CN102492813A (en) | Production technology of stainless steel band for weaving reed | |
| CN205732313U (en) | Intermediate blank quickly cooling device | |
| CN108070710A (en) | A kind of steel plate temperature control process for quenching based on roller quenching machine | |
| CN214211746U (en) | Steel rolling production line | |
| CN109092906B (en) | A kind of on-line tuning method of five Stands Cold Tandem Mills group slipping phenomenon | |
| CN105695727B (en) | A kind of board-shape control method of steel plate on-line solution processing | |
| CN108941213B (en) | Rolling method for controlling structural uniformity of high-strength hot-rolled steel plate | |
| CN207057282U (en) | Water tank parameter on-line tuning system based on rolled piece head and tail temperature difference | |
| CN110355213A (en) | Short route production medium carbon steel 50Mn2V's batches staggered floor control method | |
| CN111910060B (en) | Free-restraint quenching machine and free-restraint quenching process for thin and wide plates | |
| CN110548763B (en) | Method for reducing buckling of thick plate | |
| CN110438324B (en) | Vacuum annealing method for cold-rolled titanium plate | |
| CN107150067A (en) | Wire coiling rolling line and production method | |
| KR20100012740A (en) | Wire-rod manufacturing method | |
| CN111633040A (en) | Method for controlling water ripples on lower surface of Carter steel | |
| CN104307897B (en) | A kind of process eliminating belt steel surface pit defect | |
| CN220547456U (en) | Cooling device used before steel rolling process | |
| CN114042761B (en) | Control method for eliminating laminar cooling wave shape of thin pattern plate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |