CN108380674A - A kind of Wide and Thick Slab production constant speed rolling nose control method - Google Patents
A kind of Wide and Thick Slab production constant speed rolling nose control method Download PDFInfo
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- CN108380674A CN108380674A CN201810146380.8A CN201810146380A CN108380674A CN 108380674 A CN108380674 A CN 108380674A CN 201810146380 A CN201810146380 A CN 201810146380A CN 108380674 A CN108380674 A CN 108380674A
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- rolling
- temperature
- control system
- constant speed
- steel plate
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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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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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
- B21B37/46—Roll speed or drive motor control
Abstract
The present invention relates to the technology of the finish rolling stage nose of heavy plate mill control, more particularly to a kind of Wide and Thick Slab produces constant speed rolling nose control method.The present invention uses constant speed rolling method, and steel plate head tail can be made to obtain smooth plate shape through the invention, and steel plate flatness is high, and can reduce the abnormal generation of rolling, reduces nose to the injury protection of milling equipment milling equipment.Present invention mainly solves the differences of the linear velocity using milling train upper working rolls and lower working rolls insufficient present on current nose control method.
Description
Technical field
The present invention relates to the technology of the finish rolling stage nose of heavy plate mill control, more particularly to a kind of Wide and Thick Slab produces constant speed
Roll nose control method.
Background technology
In present Heavy plate production, the steel plates such as controlled rolling technique productions high-level boat plate, high-tensile structural steel are generally used.
So-called controlled rolling is exactly by making all rolling technological parameters (heating temperature, the temperature of each rolling pass, drafts)
It optimizes, so that austenitic state is mutually become the rolling mill practice of fine ferrite structure, to improve the comprehensive of steel plate
Energy.Baosteel 5M Thick Plate Plants roughing mill and finishing mill work compound, are calculated with same model, and optimize distribution rolling pass rule
Journey, by the matching of rolling rhythm, roughing mill provides qualified intermediate base for finishing mill.So the operation of rolling is generally divided into four
Stage, i.e. shaping stage, broadening stage, after finish rolling stage and the finish rolling stage after temperature before temperature.Wherein preceding three phases are in roughing
Machine is completed, and is rolled substantially in recrystallization zone, and fourth stage is completed in finishing mill, is generally rolled in non-crystal region.
In production, the steel plate nose after temperature control is difficult to control, and holding gauge is thicker, control temperature is lower, and situation is got over
Seriously.Be abnormal in the special heavy plate of rolling largely can not continue normally to roll since nose is serious, and this
The serious special heavy plate of nose is difficult to be flattened with press, leads to steel plate poor flatness.The serious steel plate of nose after temperature control simultaneously
There is a great harm for milling equipment, this serious nose will be long-term to the injury of milling train, roll, roller-way, and consequence is serious.
Invention content
The present invention is to solve above-mentioned technological deficiency, provides a kind of Wide and Thick Slab production constant speed rolling nose control method.This hair
It is bright to use constant speed rolling method, steel plate head tail can be made to obtain smooth plate shape through the invention, steel plate flatness is high, and can
To reduce the abnormal generation of rolling, nose is reduced to the injury protection of milling equipment milling equipment.Present invention mainly solves profits
With the difference of the linear velocities of milling train upper working rolls and lower working rolls insufficient present on current nose control method.
The technical scheme is that；A kind of Wide and Thick Slab production constant speed rolling nose control method, includes the following steps；
S1；The transmission of operation of rolling data：Before finish rolling rolling, plate size and rolling mode are by manufacture automatic control
System is transmitted to automatic process control system system, the size of steel plate and RPM schedule by automatic process control system system according to slab and
Rolling target steel plate thickness calculate, according to the ability of milling train carry out precomputation, arrange rolling pass, by mill model machine according to
The requirement of thickness is according to the value for calculating the RPM schedule for sending setting to Basic automation control system；
S2；Temperature control steel plate finish rolling phase sets：Determine slab controlled rolling final performance mainly has holding gauge, temperature control
Add up drafts after start rolling temperature, temperature control after finishing temperature, temperature control afterwards, so finishing temperature and performance indicator are also one after temperature control
A considerable index formulates the finish rolling stage by manufacture automatic control system and waits for temperature thickness, and the finished product for being 1.6-3 times is thick
Degree, and the finish rolling start rolling temperature after temperature is formulated, manufacture automatic control system handle waits for that temperature thickness and finish rolling start rolling temperature are transmitted to
Automatic process control system system, by automatic process control system system-computed Chu Zong road numbers and passage sharing of load；
S3；Finishing mill constant speed RPM schedule is set：Biting speed and mill speed are equal, acceleration zero；
S4；The setting of SKI values：SKI values are provided by Basic automation control system, the case where using constant speed RPM schedule
Under, SKI values are -1, i.e. lower roll linear velocity slower than lower roll linear velocity 1%.
The beneficial effects of the invention are as follows；The present invention is used by improving biting speed, reducing rolling maximum speed, makes to sting steel
Speed reaches consistent with rolling maximum speed, and doing so can make acceleration be zero, and constant speed RPM schedule can be formed in rolling,
Its rate curve is close to trapezoidal rate curve.Warping phenomenon end to end can be solved in this way, keeps steel-plate shape smooth, and nothing is stuck up after aligning
Qu Xianxiang, cold strong pressing rate is low, and reduces the injury to milling equipment.Use through the invention：It solves slab to roll
Machine can effectively control steel plate nose in controlled rolling, using constant speed rolling method, and the flatness of steel plate is made to be improved, can be with
Make to roll rear steel plate unevenness control in 1-2mm/m.Present invention adaptation is wide, can be adapted for needing using controlled rolling method
On heavy plate mill, there is wide Technique Popularizing foreground.
Description of the drawings
Triangular velocity curve when Fig. 1 is rolling and corresponding effect of rolling figure.
Trapezoidal rate curve when Fig. 2 is rolling and corresponding effect of rolling figure.
Specific implementation mode
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；It is attached in order to more preferably illustrate the present embodiment
Scheme certain components to have omission, zoom in or out, does not represent the size of actual product；To those skilled in the art,
The omitting of some known structures and their instructions in the attached drawings are understandable.Being given for example only property of position relationship described in attached drawing
Illustrate, should not be understood as the limitation to this patent.
As shown in Figure 1, art methods principle is fairly simple, the steel plate that upper and lower surface temperature difference generates mainly is solved
Nose is effective using the control of SKI values (sticking up discount value) to carry out steel plate nose if temperature difference is not very big.But
It is from execute-in-place practice, start rolling temperature is relatively low after upper and lower surface temperature difference is larger or steel plate temperature control, simply uses SKI
Value (sticking up discount value) just seems that effect is inadequate to carry out the control of steel plate nose.Yield strength is rolled in Wide and Thick Slab production process
More than 400Mpa, finished product thickness is more than 40mm, when rolling low temperature controlled rolling steel plate, can produce when finish rolling start rolling temperature is less than 820 DEG C
Raw serious steel plate nose phenomenon.Reason is analyzed, is because milling train forms an acceleration from biting speed to rolling maximum speed
Process, generate a triangular velocity curve.It is big in finish rolling stage rolling yield strength, the low steel plate of finish rolling start rolling temperature
When, this accelerator just will produce nose.Such nose, steel-plate shape can become very poor, and straightener can not thorough leveling.
Embodiment 1；
The prior art is compared, the present invention provides a kind of Wide and Thick Slab production constant speed rolling nose control method, including following step
Suddenly；
S1；The transmission of operation of rolling data：Before finish rolling rolling, plate size and rolling mode are by manufacture automatic control
System is transmitted to automatic process control system system, the size of steel plate and RPM schedule by automatic process control system system according to slab and
Rolling target steel plate thickness calculate, according to the ability of milling train carry out precomputation, arrange rolling pass, by mill model machine according to
The requirement of thickness is according to the value for calculating the RPM schedule for sending setting to Basic automation control system；
S2；Temperature control steel plate finish rolling phase sets：Determine slab controlled rolling final performance mainly has holding gauge, temperature control
Add up drafts after start rolling temperature, temperature control after finishing temperature, temperature control afterwards, so finishing temperature and performance indicator are also one after temperature control
A considerable index formulates the finish rolling stage by manufacture automatic control system and waits for temperature thickness, and the finished product for being 1.6-3 times is thick
Degree, and the finish rolling start rolling temperature after temperature is formulated, manufacture automatic control system handle waits for that temperature thickness and finish rolling start rolling temperature are transmitted to
Automatic process control system system see the table below 1 by automatic process control system system-computed Chu Zong road numbers and passage sharing of load；
Table 1：Mill load parameter list
| Holding gauge multiple | Roll total road number | Passage maximum rolling force | Passage peak torque |
| 1.6 | 3 | 40NM | 2500KNM |
| 2 | 4-5 | 40NM | 2500KNM |
| 2.5 | 5 | 50NM | 2800KNM |
| 3 | 7 | 50NM | 2800KNM |
S3；Finishing mill constant speed RPM schedule is set：Biting speed and mill speed are equal, and acceleration zero is shown in Table 2；
Table 2：Rolling mill speed parameter setting table
| Finishing mill | |
| Biting speed | 1.5m/s |
| Mill speed | 1.5m/s |
| Acceleration | 0m/s2 |
S4；The setting of SKI values：SKI values are provided by Basic automation control system, the case where using constant speed RPM schedule
Under, SKI values are -1, i.e. lower roll linear velocity slower than lower roll linear velocity 1%.
This technology is used by improving biting speed, reducing rolling maximum speed, makes biting speed and rolling maximum speed
Reach consistent, doing so can make acceleration be zero, and constant speed RPM schedule can be formed in rolling, and rate curve is close to trapezoidal
Rate curve is shown in Fig. 2.Warping phenomenon end to end can be solved in this way, keep steel-plate shape smooth, it is cold to rectify without warping phenomenon after aligning
Pressing rate is low, and reduces the injury to milling equipment.
In place of the main difference of the present invention and the prior art：
1, constant speed RPM schedule can be formed in rolling.Biting speed is set to reach consistent with rolling maximum speed, acceleration
It is zero, can completes to roll with constant speed, formed and approached and trapezoidal rate curve system to avoid nose is generated when milling train accelerates
Degree.
2, using small SKI values (linear speed angle value).Analysis find excessive SKI values upper and lower roll speed difference can be caused big and on
Roller load increases, and upper roller has slipping phenomenon, and upper surface actual linear velocity only can be slower than lower surface linear velocity after upper roller is skidded, and rises
Opposite effect has been arrived, steel plate nose is exacerbated；Compared with using big SKI values, small SKI values can accomplish upper and lower roll speed difference
Less, the load of upper and lower roll is also not much different, and constant speed RPM schedule, which is used in combination, can effectively contain steel plate nose.
Embodiment 2；
Steel grade：Q550CFD, billet size：228X2100X3682mm rolls yield strength 550Mpa, finished product thickness
30mm, intermediate base wait for that temperature thickness is 3 times of finished product thicknesses, i.e. 90mm, 790 DEG C of finish rolling stage start rolling temperature, finish rolling 7 passages of rolling.
Finishing pass mill speed parameter setting：Biting speed 1.5m/s, highest mill speed 1.5m/s, actual acceleration 0m/s2。
The plate shape that steel plate after rolling is completed in finish rolling with constant speed is smooth, and integral plate unevenness is controlled in 1.2mm/m.
Embodiment 3；
Steel grade：AH40-TM, billet size：228X1900X3202mm rolls yield strength 400Mpa, finished product thickness
40mm, intermediate base wait for that temperature thickness is 2 times of finished product thicknesses, i.e. 80mm, 820 DEG C of finish rolling stage start rolling temperature, finish rolling 5 passages of rolling.
Finishing pass mill speed parameter setting：Biting speed 1.5m/s, highest mill speed 1.5m/s, actual acceleration 0m/s2。
The plate shape that steel plate after rolling is completed in finish rolling with constant speed is smooth, and integral plate unevenness is controlled in 1.6mm/m.
Embodiment 4；
Steel grade：B-HARD400B billet sizes：228X2100X2856mm rolls yield strength 400Mpa, finished product thickness
50mm, intermediate base wait for that temperature thickness is 1.8 times of finished product thicknesses, i.e. 90mm, 820 DEG C of finish rolling stage start rolling temperature, finish rolling rolling 5
It is secondary.Finishing pass mill speed parameter setting：Biting speed 1.5m/s, highest mill speed 1.5m/s, actual acceleration 0m/
s2.The plate shape that steel plate after rolling is completed in finish rolling with constant speed is smooth, and integral plate unevenness is controlled in 2mm/m.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
All any modification, equivalent and improvement etc., should be included in the claims in the present invention made by within the spirit and principle of invention
Protection domain within.
Claims (1)
1. a kind of Wide and Thick Slab produces constant speed rolling nose control method, which is characterized in that include the following steps；
S1；The transmission of operation of rolling data：Before finish rolling rolling, plate size and rolling mode are by manufacture automatic control system
It is transmitted to automatic process control system system, the size and RPM schedule of steel plate are by automatic process control system system according to slab and rolling
Target steel plate thickness calculates, and carries out precomputation according to the ability of milling train, rolling pass is arranged, by mill model machine according to thickness
Requirement according to calculate to Basic automation control system send setting RPM schedule value；
S2；Temperature control steel plate finish rolling phase sets：Determine slab controlled rolling final performance mainly have holding gauge, temperature control after open
It rolls and adds up drafts after temperature, temperature control after finishing temperature, temperature control, so finishing temperature and performance indicator are also a phase after temperature control
When important index, the finish rolling stage is formulated by manufacture automatic control system and waits for temperature thickness, is 1.6-3 times of finished product thickness, and
And the finish rolling start rolling temperature after temperature is formulated, manufacture automatic control system handle waits for that temperature thickness and finish rolling start rolling temperature are transmitted to process certainly
Dynamic networked control systems, by automatic process control system system-computed Chu Zong road numbers and passage sharing of load；
S3；Finishing mill constant speed RPM schedule is set：Biting speed and mill speed are equal, acceleration zero；
S4；The setting of SKI values：SKI values are provided by Basic automation control system, using constant speed RPM schedule,
SKI values are -1, i.e. lower roll linear velocity slower than lower roll linear velocity 1%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810146380.8A CN108380674B (en) | 2018-02-12 | 2018-02-12 | Constant-speed rolling head warping control method for wide and thick plate production |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810146380.8A CN108380674B (en) | 2018-02-12 | 2018-02-12 | Constant-speed rolling head warping control method for wide and thick plate production |
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| CN108380674A true CN108380674A (en) | 2018-08-10 |
| CN108380674B CN108380674B (en) | 2020-03-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111014306A (en) * | 2019-12-28 | 2020-04-17 | 新疆八一钢铁股份有限公司 | Method for improving low-temperature rolled plate shape warping of thick-specification wind power steel |
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| CN111014306A (en) * | 2019-12-28 | 2020-04-17 | 新疆八一钢铁股份有限公司 | Method for improving low-temperature rolled plate shape warping of thick-specification wind power steel |
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