CN101992215B - Axial movement control method for continuously variable crown (CVC) working roll - Google Patents
Axial movement control method for continuously variable crown (CVC) working roll Download PDFInfo
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- CN101992215B CN101992215B CN2009100564075A CN200910056407A CN101992215B CN 101992215 B CN101992215 B CN 101992215B CN 2009100564075 A CN2009100564075 A CN 2009100564075A CN 200910056407 A CN200910056407 A CN 200910056407A CN 101992215 B CN101992215 B CN 101992215B
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Abstract
The invention relates to an axial movement control method for a continuously variable crown (CVC) working roll and relates to a method for controlling the shape of a cold-rolling strip steel plate. The method solves the problem that the strip steel material production changes a lot and the problem that the axial movement position value of the working roll cannot stably transit to the axial movement position value of the next strip steel target working roll during continuous production. The method comprises the following steps of: defining the thickness grade and the width grade of the strip steel; establishing a working roll axial movement position setting value table; acquiring characteristic data of the working roll; determining the total length and the direction of the axial movement of the working roll; determining total movement times; determining one strip steel constant speed; determining total movement time; determining movement interval time; outputting the axial movement position value and the movement direction of the working roll; and stably rolling for one minute. By the method, a strip steel rolling mill unit can be automatically adapted to the production of the strip steel with different material characteristics; one plate shape can be automatically controlled to be converted into another plate shape; the target control precision is higher; and the method is easy and convenient to operate and has wide adaptability.
Description
Technical field
The present invention relates to use in a kind of smelting iron and steel the production technology of " the CVC working roll moves axially " control cold-rolled strip steel shape, particularly a kind of CVC working roll moves axially optimal control method.
Background technology
Roll is the visual plant of rolling cold-strip steel attenuation, and the CVC working roll move axially control be the key of guaranteeing that plate shape is straight.The roll equipment of the invention of the Germany of CVC roll " SMS enlightening mug(unit of measure) limited company ".As shown in Figure 1.Fig. 1 is the axially movable sketch map of CVC working roll.
In order to reach the straight control of plate shape, generally at the upper and lower configuration CVC of band steel 3 working roll, promptly top working roll 1, and bottom working roll 2, each working roll have two-way mobile function.(a) among the figure moves axially the center for the CVC working roll; (b) move axially the positive direction position for the CVC working roll; (c) move axially the negative direction position for the CVC working roll.As shown in the figure, the recessed side of each CVC working roll is done vertically to move away from central point and is called positive direction and moves, and the protruding side of each CVC working roll is done vertically to move away from central point and is called negative direction and moves.When rolling cold-strip steel, according to width of incoming band steel and thickness, confirm its working roll value of moving axially, utilize the convexity of current roll gap, the control belt plate shape improves plate shape glacing flatness, reduces plate shape error.Therefore how effectively controlling working roll moves axially the position, makes its both effectively normal rolled band steel, does not produce new plate shape error again.Being the requirement of user to product quality on the one hand, also is the requirement that cold-rolling process improves lumber recovery on the other hand, and this is an important topic that generally receives publicity and need need to be resolved hurrily in the field of business.
The characteristics that the CVC technology is the most outstanding are to move axially through CVC working roll shown in Figure 1, can continuously change the convexity of roll gap, and a cover roll can satisfy the rolling procedure of different convexitys, and roll gap convexity adjustment capability is very strong simultaneously.Straight for guaranteeing milling train exit plate shape in cold-rolled process; The band steel shape control target curve of each frame or each rolling pass is that proportionally the convexity principle of invariance is set, and roll gap convexity control ability is to weigh a very important index of milling train plate shape control ability undoubtedly.When high-speed rolling band steel, how band steel supplied materials dynamic variable specification moves axially the goal-setting position with the CVC working roll, is the key issue of common concern.Above-mentioned CVC working roll positive direction moves, and makes belt plate shape become intermediate thin, the shape that both sides are thick; CVC working roll negative direction moves, and makes belt plate shape become thick middle, the shape that both sides are thin.Because it is different with the product technological requirement of making pop can to make Automobile Plate, the belt plate shape shape need is different, and producing continuously is can't working roll be moved axially the goal-setting value.
The open source literature that has occurred at present some relevant CVC technical research in the industry, example:
Chinese patent number 01813956.6 (milling train with a pair of CVC roll) is the technology of utilizing the shift position control belt plate shape of CVC roll, and it is with the application's difference: the one, Roller Machining become the shape of CVC in the grinding roller workshop; The 2nd, through the contact zone of horizontal force moment, moment is reduced through the CVC grinding part of an inclination; The 3rd, the radius change curve of CVC roll; The 4th, the best slope of roll.
Chinese patent number 200610029704.7 (Working roll moving devices) are the technology of utilizing roll shift position control belt plate shape, and itself and the application's difference is: one is a fixed block; The 2nd, movable block.Three is cover mobile devices.
Belt plate shape mainly is to move axially through working roll, changes current roll gap convexity, and through the variation of roll gap convexity, the load of eliminating between strip edge portion's working roll and the backing roll distributes, and improves the control of strip convexity, realizes plate shape flatness control.It is to confirm according to the thickness specification and the width specifications of incoming band steel that the CVC working roll that process computer adopted of prior art moves axially positional value.These setting values are the empirical values that constantly accumulate in the production process.Setting value is thickness specification and the width specifications according to rolled band steel; The empirical value that the scene obtains; Deposit in the process computer; Process computer moves axially the position setting value table according to the thickness and the corresponding working roll of width of current preparation rolled band steel, sends working roll and moves axially positional value and moving direction.Table 1 is that existing working roll moves axially the position setting value table.
Table 1: existing working roll moves axially the position setting value table
And the real work roll shaft is to shift position and moving direction fixed condition really: the one, and after work roll changing finished, recessed side of CVC working roll or protruding side were done moving away from central point vertically.The 2nd, produce and shut down, the physical location state of working roll axial location in frame.That is to say that working roll axial location and direction are definite before rolled band steel, and move to corresponding target location.When rolled band steel, it is only to make fine tune in existing position that working roll moves axially, and is the uniform wear that solves working roll.
Existing process computer calculates the axially movable positional value of working roll according to production status and band steel supplied materials specification.Production status has dual mode: the one, and to beginning when rolling, the working roll that from table, reads this band steel correspondence moves axially positional value from production line stop.The operator is according to given setting value, and the manual adjustments working roll moves to the goal-setting position.The 2nd, continuous production; The thickness specification of front and back band steel is consistent with width specifications; Axially movable positional value of working roll and direction were inherited when last winding steel was produced, and last band steel production is accomplished, and follow-up band steel is produced continuously; Directly export axially movable positional value of working roll and the moving direction of inheriting, promptly the axially movable positional value of working roll is constant.
Fig. 2 is that existing C VC working roll moves axially trajectory diagram, and the A line is shift position, the long center of top working roll among the figure, and the B line is shift position, the long center of bottom working roll, as can be seen from Figure 2, and because of the band steel of producing is the product of same specification.Upper working rolls and lower working rolls is axially done slightly to move.
The advantage of the control method of prior art is: the one, and band steel specifications vary is little, and the working roll shift position is little, and roll gap convexity changes in amplitude is little, and the control of plate shape is stable; The 2nd, the band steel is produced continuously, and next winding steel specification is identical with current production band steel, and then axially movable positional value of working roll and moving direction are produced the control data of being with steel with inheriting.The shortcoming of the control method of prior art: the one, current production coil of strip and next coil volume are with the Target Board shape that the steel specifications vary is big, the type that manufactures a finished product requires different, and working roll moves axially the position can't smooth transition be with the axially movable position setting value of working roll of steel to next; Make the working roll of next band steel move axially the goal-setting value; Production line must be shut down, and just can reach the corresponding working roll of next band steel and move axially the position, that is to say; Plate shape shape can't be from intermediate thin; The thick plate shape shape in both sides automatically switches to thick middle, the plate shape shape that both sides are thin, or can't be from thick middle; The thin plate shape shape in both sides automatically switches to intermediate thin, the plate shape shape that both sides are thick; The 2nd, because of the axially movable positional value of working roll of band steel before inheriting, working roll moves axially position actual value and goal-setting value deviation is big, and it is no longer controlled to produce belt plate shape, causes that the fluctuation of roll gap convexity is big, and the belt plate shape error is big.The result has a lot of plate shape errors on the band steel after working roll moves axially, band steel lumber recovery is low.
Summary of the invention
The objective of the invention is in order to solve the problem that prior art exists; Provide a kind of CVC working roll to move axially optimal control method; Utilize this method to decide working roll to move axially position and the band steel production of adaptation dissimilar material properties automatically, solve when producing continuously, produce the belt steel material variation greatly; Working roll moves axially the position and can't smooth transition moves axially the problem of positional value to next band steel target working roll, guarantees that production line produces continually and steadily.
The objective of the invention is to realize through following technical scheme:
A kind of CVC working roll moves axially control method, is the method for control cold-rolled strip steel shape, it is characterized in that may further comprise the steps:
The 1st step is divided belt steel thickness grade and strip width grade, sets up working roll and moves axially the position setting value table;
The 2nd step, collecting work roller performance data comprises the actual value of current rolled band steel and the setting value of preparation rolled band steel;
The 3rd step; According to current rolled band steel actual value of collecting and the setting value of preparing rolled band steel; Confirm that the working roll of preparing rolled band steel moves axially total length S and moving direction; Wherein, to move axially direction be to prepare the corresponding working roll of rolled band steel to move axially direction to the working roll of said definite preparation rolled band steel; The working roll of said definite preparation rolled band steel moves axially total length S and is obtained by following formula: S=S
1-S
2, S wherein
1For preparing the setting value that the rolled band steel working roll moves axially the position, S
2Move axially the actual value of position for current band steel working roll;
The 4th step moves axially total length S according to working roll, confirms that working roll moves axially total times N that moves, and N is obtained by following formula: N=S/k, and wherein k is each movement value of operating and setting;
The 5th step in the production of rolled band steel unit, is confirmed a band steel constant speedpump v;
The 6th step according to band steel constant speedpump v, confirms that working roll moves axially total time T, and T is obtained by following formula: T=S
k/ v, wherein S
kBe that the band steel of setting passes through mill length;
The 7th step; According to the working roll of confirming move axially total length S, working roll moves axially total times N and total traveling time T of moving; Confirm that working roll moves axially each Ti blanking time that moves; Ti is obtained by following formula: Ti=(T-S/Vs)/N, and wherein Vs is that working roll moves axially speed, Vs is 1.5mm/s;
The 8th step, next is prepared rolled band steel and gets into rolled band steel unit and begin rollingly, start working roll and move axially control, according to each move blanking time Ti with total times N that moves, the output services roll shaft is to shift position value and moving direction;
The 9th step, working roll move axially positional value and have arrived desired value, stable rolling 1 minute.
Beneficial effect of the present invention:
CVC working roll of the present invention moves axially control method and oppositely moves from slightly moving to convert into significantly; Automatically realize being transformed into the control of another kind of plate shape shape from a kind of plate shape shape; The target control precision is higher; Operate easylier, adaptability is more extensive, can adapt to the band steel production of different qualities material.
When production line continuous rolling band steel, adopt method adjustment working roll of the present invention to move axially the position, can guarantee that belt plate shape keeps stable, saved the adjustment working roll shift position time again, on this basis, improved band steel finished product rate again significantly.
When production belt steel material characteristic changes, adopt method adjustment working roll of the present invention to move axially, need not the operator stop to produce, this has changed original operator shuts down earlier, again the problem of adjustment.The self adaptation productivity is strong, has guaranteed that production line produces continually and steadily.
For further specifying above-mentioned purpose of the present invention, design feature and effect, below will combine accompanying drawing that the present invention is elaborated.
Description of drawings
Fig. 1 is the axially movable sketch map of CVC working roll;
Fig. 2 moves axially trajectory diagram for existing C VC working roll;
Fig. 3 moves axially the control method flow chart for CVC working roll of the present invention;
Fig. 4 moves axially the flow chart of total length and moving direction for working roll;
Fig. 5 is total flow chart that moves number of times;
Fig. 6 moves axially the flow chart of total time for working roll;
Fig. 7 is each flow chart that moves blanking time;
Fig. 8 moves axially trajectory diagram for CVC working roll of the present invention;
Fig. 9 moves axially the flow chart of positional value and moving direction for working roll.
The specific embodiment
Accompanying drawing below in conjunction with embodiment is elaborated to the specific embodiment that CVC working roll of the present invention moves axially control method.
Fig. 3 moves axially the control method flow chart for CVC working roll of the present invention, and is as shown in the figure:
Table 2: working roll moves axially the position setting value table
In the present embodiment, divide belt steel thickness grade and width grade, strip width is divided into 5 grades, belt steel thickness is divided into 5 grades, through level of thickness and width grade corresponding relation, confirms that working roll moves axially the position setting value relation table.
Table 3: the actual value table of rolled band steel
| The steel reel number | Product type | Belt steel thickness (mm) | Strip width (mm) | Actual shift position (mm) | Actual moving direction |
| 8010023800 | Pop can | 0.575 | 1005 | -46 | Negative |
Table 4: the setting value table of preparing rolled band steel
| The steel reel number | Product type | Belt steel thickness (mm) | Strip width (mm) | Actual shift position (mm) | Actual moving direction |
| 8010023900 | Automobile Plate | 1.35 | 890 | 72 | Just |
S wherein
1For preparing the setting value that the rolled band steel working roll moves axially the position, S
2Move axially the actual value of position for current band steel working roll.
Working roll moves axially direction, and to move axially direction with the working roll of preparing rolled band steel be the target moving direction, and setting structure such as table 5 (is the setting structure of example with above-mentioned table 3, table 4) are as shown in table 5, at this moment, and S
1Be 72mm, S
2For-46mm, according to formula 1, working roll moves axially total length:
S=S
1-S
2=72mm-(46mm)=and 118mm, moving direction is a forward.
Table 5: the working roll of preparing rolled band steel moves axially total length and moving direction
| The steel reel number | Working roll moves axially total length S (mm) | Moving direction |
| 8010023900 | 118 | Just |
In sum, the job step of above-mentioned steps 303 is as shown in Figure 4, and Fig. 4 comprises following flow process for working roll moves axially the flow chart of total length and moving direction:
Step 401 reads actual value (the steel reel number CN of current rolled band steel that leaves the current rolled band steel in the table 3 in
2, product type PT
2, thickness T H
2, width W I
2, shift position S
2, moving direction SF
2);
Step 402 reads the setting value that leaves the preparation rolled band steel in the table 4 in and (prepares the steel reel number CN of rolled band steel
1, product type PT
1, thickness T H
1, width W I
1, shift position S
1, moving direction SF
1);
Step 403 is differentiated actual moving direction (current rolled band steel) and is set whether consistent (SF of moving direction (preparation rolled band steel)
2==SF
1);
Step 404 if the result is consistent in the step 403, turns back to and stops the execution work roll shaft to moving, and promptly prepares not carry out moving method of the present invention after rolling band steel gets into milling train;
Step 405 if the result is inconsistent in the step 403, is utilized above-mentioned formula 1 to calculate and is moved total length S;
Step 406 is differentiated working roll and is moved axially total length whether between transportable minimum of a value and transportable maximum, and working roll moves axially minimum of a value and is-85mm; Maximum is 85mm, referring to table 1, and band steel Breadth Maximum 1200mm; The long 1400mm of the working roll body of roll, band steel and working roll initial position such as Fig. 1 in frame, then working roll is at the each side residue 100mm of band steel; In the present embodiment, negative sense moves and is-90mm, and forward moves and is 90mm; Then the working roll minimum of a value that moves axially total length is-180mm, and maximum is 180mm;
Step 407 if working roll moves axially total length outside transportable minimum of a value and transportable maximum, is explained make mistakes (exceed makeing mistakes of capacity of equipment, system sends the value of going beyond the limit of error message, and system stops to carry out this moving method automatically);
Step 408, working roll move axially total length between transportable minimum of a value and transportable maximum, and working roll axially moves axially direction toward the working roll of preparing rolled band steel and moves.
Step 304 moves axially each variable quantity (5mm/ time) that moves that total length and user set according to working roll, confirms total mobile number of times.Fig. 5 is total flow chart that moves number of times, comprises following flow process:
Step 501 reads working roll and moves axially total length S;
Step 502 reads each variable quantity k (constant) of moving (routine 5mm/ time, the operator can revise this k value through the dialogue picture);
Step 503, always mobile times N is: N=S/k ... Formula 2.
Step 305 according to the industry characteristics (working roll moves axially in the process, can produce continuously by rolled band steel, can guarantee that again strip shape quality keeps continual and steady) of rolled band steel unit, is confirmed a unit constant speed control interval.This unit industry characteristics confirm that strip speed v is the most suitable at 80 meters/minute～160 meters/minute.It is example that present embodiment is controlled at 100 meters/minute with strip speed v constant speed.
Step 306 is set a band steel through mill length S
k, pass through mill length S according to the band steel of constant speedpump v and setting
k, confirm that working roll moves axially total time T, T=S
k/ v ... Formula 3.
Production line of rolling mill is from shutting down stable rolling band steel, and the band steel has a wedge shape change procedure, and it is 300 meters that this section strip steel is converted to normal band steel length when rolling.The present invention is when continuous rolling band steel, and the adjustment working roll moves axially the position, so under constant speed state, adjusting CVC working roll moves axially and begins to terminal procedure, setting the band steel is 250 meters through mill length.That is to say, set the band steel through the corresponding band steel of mill length through rolling time, be exactly axially movable total time of CVC working roll, constant speedpump v is 100 meters/minute, according to formula 3 evaluation work roll shafts to mobile total time T.Fig. 6 is the flow chart that working roll moves axially total time in the step 306, comprises following flow process:
Step 601 reads band steel constant speedpump value v;
Step 602 reads the band steel through mill length S
k
Step 603 obtains moving total time T=S
k/ v ... Formula 4.
Step 307 moves axially total length S, axially movable total times N and the total traveling time T of moving of working roll according to the above-mentioned fixed working roll of having confirmed, reaches working roll and moves axially speed Vs, confirms that working roll moves axially each Ti blanking time that moves.
Each blanking time Ti of moving is: Ti=(T-S/Vs)/N ... Formula 5.
Wherein, T is that working roll moves axially total time T, and S is that working roll moves axially total length, and Vs is that working roll moves axially speed.N is total times N that moves, and to move axially speed Vs be 1.5mm/s to working roll here.Fig. 7 is each flow chart that moves blanking time in the step 307, comprises following flow process:
Step 701 reads working roll and moves axially total times N that moves;
Step 702 reads working roll and moves axially total traveling time T;
Step 703 reads working roll and moves axially speed Vs;
Step 704 obtains moving Ti blanking time according to formula 5 at every turn.
Initial value Sp:Sp=current rolled band steel working roll in shift position moves axially position actual value S2,
Maximum movable length Smax:Smax=moves total length S,
Move countdown blanking time Ti
0: Ti
0=0;
Move time counter Si:Si=0,
Self adaptation side-play amount Ss:Ss=0,
Top roll shift position setting value Szt:Szt=0,
Lower roll shift position setting value Szb:Szb=0;
Step 903 is differentiated and whether is moved the number of times Counter Value less than total times N that moves;
Step 905 if the result is in the step 903, continues to move, and the state of this moment is:
Move time counter Si:Si=Si+1,
Self adaptation side-play amount Ss:Ss=Ss+ moves variable quantity k (k=5mm/ constant) at every turn,
Move countdown blanking time Ti
0: Ti
0=mobile at every turn Ti blanking time (according to formula 5);
Whether step 906 differentiates self adaptation side-play amount Ss greater than maximum movable length Smax;
Step 908 is not if whether the result differentiates maximum movable length Smax greater than 0 in the step 906;
Top roll shift position setting value Szt=Sp-Ss, Sp are the shift position initial value, and Ss is the self adaptation side-play amount,
Lower roll shift position setting value Szb=-Szt;
Top roll shift position setting value Szt=Sp+Ss,
Lower roll shift position setting value Szb=-Szt;
Step 912 moves countdown blanking time Ti0 counter and carries out countdown (subtraction).
If the result is not in the step 903, repeating step 912,
If the result is in the step 903, repeating step 903.
A ' expression top working roll is away from the motion track of central shaft among Fig. 8, and top working roll moves axially track.B ' expression bottom working roll is away from the motion track of central shaft, and bottom working roll moves axially track.Compare with Fig. 2, to move axially be that negative direction moves to the expression working roll among Fig. 2, and band steel shape is that band steel thick middle, band steel both sides are thin, and can only do to move by a small margin, and upper working rolls and lower working rolls is done axially can only move in the same side.Motion track begins to change from Fig. 2 motion track among Fig. 8; During beginning, it is negative direction that working roll moves axially direction, (c) among band steel shape such as Fig. 1; Upper working rolls and lower working rolls moves axially and carries out; A ' and B ' move to infall, (a) among expression upper working rolls and lower working rolls shift position such as Fig. 1, and band steel shape is got back to reset condition.When the motion track of B ' last, the motion track of A ' is down, it is that positive direction moves that the expression working roll moves axially.Arrive the shift position of goal-setting at last, (b) among expression upper working rolls and lower working rolls shift position such as Fig. 1 is to move total length from the beginning shift position to vertical range the final position.
Method of the present invention is through test, and the mobile working roller switches to another kind of finished product type from a kind of finished product type automatically, and strip shape quality is stable during switching.
Those of ordinary skill in the art will be appreciated that; Above embodiment is used for explaining the object of the invention; And be not with opposing qualification of the present invention; As long as in essential scope of the present invention, all will drop in the scope of claim of the present invention variation, the modification of the above embodiment.
Claims (4)
1. a CVC working roll moves axially control method, is the method for control cold-rolled strip steel shape, it is characterized in that may further comprise the steps:
The 1st step is divided belt steel thickness grade and strip width grade, sets up working roll and moves axially the position setting value table;
The 2nd step, collecting work roller performance data comprises the actual value of current rolled band steel and the setting value of preparation rolled band steel;
The 3rd step; According to current rolled band steel actual value of collecting and the setting value of preparing rolled band steel; Confirm that the working roll of preparing rolled band steel moves axially total length S and moving direction; Wherein, to move axially direction be to prepare the corresponding working roll of rolled band steel to move axially direction to the working roll of said definite preparation rolled band steel; The working roll of said definite preparation rolled band steel moves axially total length S and is obtained by following formula: S=S
1-S
2, S wherein
1For preparing the setting value that the rolled band steel working roll moves axially the position, S
2Move axially the actual value of position for current band steel working roll;
The 4th step moves axially total length S according to working roll, confirms that working roll moves axially total times N that moves, and N is obtained by following formula: N=S/k, and wherein k is each movement value of operating and setting;
The 5th step is confirmed a band steel constant speedpump v in the production of rolled band steel unit;
The 6th step according to band steel constant speedpump v, confirms that working roll moves axially total time T, and T is obtained by following formula: T=S
k/ v, wherein S
kBe that the band steel of setting passes through mill length;
The 7th step; According to the working roll of confirming move axially total length S, working roll moves axially total times N and total traveling time T of moving; Confirm that working roll moves axially each Ti blanking time that moves; Ti is obtained by following formula: Ti=(T-S/Vs)/N, and wherein Vs is that working roll moves axially speed, Vs is 1.5mm/s;
The 8th step, next is prepared rolled band steel and gets into rolled band steel unit and begin rollingly, start working roll and move axially control, according to each move blanking time Ti with total times N that moves, the output services roll shaft is to shift position value and moving direction;
The 9th step, working roll move axially positional value and have arrived desired value, stable rolling 1 minute.
2. CVC working roll as claimed in claim 1 moves axially control method, it is characterized in that:
In said the 1st step, strip width is divided into 5 grades, belt steel thickness is divided into 5 grades, through level of thickness and width grade corresponding relation, confirms that working roll moves axially the position setting value relation table.
3. CVC working roll as claimed in claim 1 moves axially control method, it is characterized in that:
In said the 2nd step,
The actual value of said current rolled band steel comprises: the steel reel number, and product type, finished strip thickness, strip width, working roll move axially position actual value and working roll moves axially direction;
The setting value of said preparation rolled band steel comprises: the steel reel number, and product type, finished strip thickness, strip width, working roll moves axially position setting value, and working roll moves axially direction.
4. CVC working roll as claimed in claim 1 moves axially control method, it is characterized in that:
In said the 5th step, the industry characteristics of said rolled band steel unit are meant that working roll moves axially in the process, and rolled band steel is produced continuously and kept continual and steady, and said band steel constant speedpump is 100 meters/minute.
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| CN108273853B (en) * | 2018-01-19 | 2019-09-03 | 山东钢铁集团日照有限公司 | A kind of continuous hot-rolling mill working roll intelligence roller shifting method |
| WO2020156787A1 (en) * | 2019-01-28 | 2020-08-06 | Primetals Technologies Germany Gmbh | Changing the effective contour of a running surface of a working roll during the hot rolling of rolling stock in a roll stand to form a rolled strip |
| CN110170534B (en) * | 2019-05-15 | 2020-07-03 | 柳州钢铁股份有限公司 | Control method for automatic roll shifting of intermediate roll of rolling mill |
| CN112186488A (en) * | 2020-10-07 | 2021-01-05 | 罗根激光科技（武汉）有限公司 | Timed frequency doubling crystal automatic displacement system |
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