CN107030119A - The control method of hot continuous rolling workpiece thickness and extrusion ingot length - Google Patents

The control method of hot continuous rolling workpiece thickness and extrusion ingot length Download PDF

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Publication number
CN107030119A
CN107030119A CN201710272775.8A CN201710272775A CN107030119A CN 107030119 A CN107030119 A CN 107030119A CN 201710272775 A CN201710272775 A CN 201710272775A CN 107030119 A CN107030119 A CN 107030119A
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roll
force
frame
workpiece thickness
rolling
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CN107030119B (en
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许磊
黄明辉
蒋婷
刘栩
李毅波
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GUANGXI LIUZHOU YINHAI ALUMINUM INDUSTRY Co Ltd
Central South University
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GUANGXI LIUZHOU YINHAI ALUMINUM INDUSTRY Co Ltd
Central South University
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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
    • B21B37/165—Control of thickness, width, diameter or other transverse dimensions responsive mainly to the measured thickness of the product
    • 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
    • B21B37/70—Length control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/04—Thickness, gauge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/12—Length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/12—Rolling load or rolling pressure; roll force

Abstract

The invention discloses the control method of a kind of hot continuous rolling workpiece thickness and extrusion ingot length, it is related to metal-pressed machine technical field, this method is according to the rolling pass reduction ratio and the finished product thickness of rolled piece of each frame of tandem mill of setting, the rolling pass drafts of inverse workpiece thickness a reference value and each frame；Roll-force check is carried out to workpiece thickness a reference value and is corrected, if there is the situation for calculating maximum rolling force License Value of the roll-force more than frame permission, then reduce the drafts of the passage, iterate calculating, until calculating roll-force is less than or equal to maximum rolling force License Value；Calculating is modified to workpiece thickness a reference value again, pricked in roughing mill to the workpiece thickness calculated；Workpiece thickness value according to obtained by amendment, from roughing mill to tandem mill between roller-way length and The ingot casting thickness calculate extrusion ingot length, cast ingot casting according to obtained extrusion ingot length is calculated.The present invention solves the problem of existing hot continuous rolling production yield rate is low.

Description

The control method of hot continuous rolling workpiece thickness and extrusion ingot length
Technical field
The present invention relates to metal-pressed machine technical field, especially a kind of control hot continuous rolling workpiece thickness and ingot casting are long The method of degree.
Background technology
At present, the workpiece thickness setting value of hot continuous rolling is to be estimated by the technical staff of factory according to knowhow , with very big uncertainty.It is this to estimate that obtained workpiece thickness setting value cause problems with by rule of thumb：It is central Between base thickness setting value it is bigger than normal when, each frame pressure load may be caused to transfinite and trigger accident；When workpiece thickness setting value When less than normal, roughing mill rolling pass will be caused excessive, and the passage of tandem mill pressure load is less than normal, not only adds milling train work( Consumption, and reduce production efficiency.Load is less than normal also can result in skidding between the roll of Continuous mill train and band for pressure, makes The operation of rolling tends to unstable state.Further, since manually estimation workpiece thickness setting value has relatively large deviation, further add The big design error of extrusion ingot length.When the extrusion ingot length manually estimated is long, the length for middle base easily occur exceeds roughing Roller-way allows the phenomenon of length between machine and tandem mill, and site operation personnel is forced to increase the thickness of middle base, causes tandem mill frame Pressure load transfinites, or takes and increase the measure for cutting damage amount end to end in rough rolling process, can so reduce yield rate.Work as ingot casting When length is too short, yield rate can be also reduced.
The content of the invention
It is an object of the invention to provide the control method of a kind of hot continuous rolling workpiece thickness and extrusion ingot length, this method can To solve the problem of existing hot continuous rolling production yield rate is low.
In order to solve the above problems, the technical solution adopted by the present invention is：This hot continuous rolling workpiece thickness and ingot casting are long The control method of degree comprises the following steps：
A, rolling pass reduction ratio and the finished product thickness of rolled piece according to each frame of tandem mill of setting, inverse workpiece thickness base The rolling pass drafts of quasi- value and each frame；
B, workpiece thickness a reference value is carried out roll-force check and to correct：First with the rolling in the second-level model system of milling train Power computation model, the roll-force to each passage is checked, and exceedes the maximum rolling that frame allows if there is roll-force is calculated The situation of power License Value, then reduce the drafts of the passage, and iterate calculating, is rolled until calculating roll-force less than or equal to maximum Power License Value processed；Calculating is modified to workpiece thickness a reference value again, pricked in roughing mill to the workpiece thickness calculated；
C, the workpiece thickness value according to obtained by amendment, from roughing mill to tandem mill between roller-way length and The ingot casting thickness calculate Extrusion ingot length, ingot casting is cast according to obtained extrusion ingot length is calculated.
In the technical scheme of the control method of above-mentioned hot continuous rolling workpiece thickness and extrusion ingot length, more specifically technical scheme It can also be：Tandem mill is using four frames, according to the setting principle of rolling mill practice, the first frame to the rolling road of the 4th frame Secondary reduction ratio is followed successively by a%, b%, c%, d%；The rolling pass drafts of first frame to the 4th frame is followed successively by y1、y2、 y3、y4, unit is millimeter；The finished product thickness of rolled piece is hp, unit is millimeter；Assuming that workpiece thickness a reference value is hf, unit is Millimeter；Then the calculating formula of the workpiece thickness a reference value in step A is：
The calculating formula of the rolling pass drafts of each frame is：
Further, the specific method for carrying out roll-force check to workpiece thickness a reference value in step B and correcting is as follows：
According to technique initialization, it is known that middle base is in the road of the entrance rolling temperature, the finishing temperature of rolled piece, each frame of Continuous mill train Secondary drafts technological parameter, and using the tube rolling simulation model in the second-level model system of milling train, calculate the first frame extremely The roll-force of the rolled piece of 4th frame, it is assumed that the roll-force of the rolled piece of the first frame calculated to the 4th frame is respectively f1、f2、f3、f4, unit is thousand Ns；The maximum license roll-force of each frame is respectively F1max、F2max、F3max、F4max, unit is thousand Ox.In order to avoid the phenomenon that roll-force transfinites occurs in each passage, progress judges as follows：
(1) if there is f1＞ F1maxWhen, then make y10.5 millimeter is reduced, roll-force check is carried out again, until roll-force is no longer Transfinite；
(2) if there is f2＞ F2maxWhen, then make y20.3 millimeter is reduced, roll-force check is carried out again, until roll-force is no longer Transfinite；
(3) if there is f3＞ F3maxWhen, then make y30.2 millimeter is reduced, roll-force check is carried out again, until roll-force is no longer Transfinite；
(4) if there is f4＞ F4maxWhen, then make y40.1 millimeter is reduced, roll-force check is carried out again, until roll-force is no longer Transfinite；
Assuming that the rolling pass drafts of the first frame to the 4th frame by n-th amendment is followed successively by y1n、y2n、y3n、y4n, Unit is millimeter；After the roll-force of each passage no longer transfinites, calculated according to revised each reduction in pass by amendment Workpiece thickness value hf', unit is millimeter, and calculating formula is：
hf'=hp+y4n+y3n+y2n+y1n。
Further, the calculating formula of extrusion ingot length is in step C：
Wherein, L is the length of ingot casting, and unit is millimeter；GmaxFor the roller-way length between from roughing mill to tandem mill, unit is milli Rice；H is the thickness of ingot casting, and unit is millimeter.It is longer according to ingot casting, the higher principle of yield rate, i.e., in the middle of base length just with Roller-way allows the maximum length value for putting middle base equal to consider between roughing mill and tandem mill, from roughing mill to tandem mill between Roller-way length is maximum allowable middle base length.If the value of the L is long without departing from the maximum ingot casting that founding process can be cast out Angle value, then finally selected extrusion ingot length is the value.If the maximum extrusion ingot length that L value can be cast out beyond founding process Value, then only the maximum extrusion ingot length value that need to can be cast out according to founding process casts ingot casting.
The thickness and length of ingot casting all have an impact to the thickness of middle base, because the length of ingot casting can pass through casting process And the amount of sawing end to end of ingot casting is controlled, and thickness is determined by the crystallizer specification of founding process, it is impossible to arbitrarily change, Therefore the present invention considers the thickness of ingot casting being considered as given value, and the only length to ingot casting carries out calculation and check.
By adopting the above-described technical solution, the present invention has the advantages that compared with prior art：The present invention is logical Calculating control roughing mill rolling and the founding process of three above step are crossed, optimal workpiece thickness and corresponding thereto is obtained The optimal extrusion ingot length answered, on the premise of product mechanical property index is ensured, can prevent the operation of rolling negative due to pressure Lotus is transfinited and interrupted, it is to avoid the generation of equipment breakdown, while avoiding because extrusion ingot length and workpiece thickness are mismatched That brings additionally cuts damage end to end, improves yield rate.
Embodiment
With reference to embodiment, the invention will be further described：
The hot continuous rolling workpiece thickness and the control method of extrusion ingot length of the present embodiment, using " 1+4 " hot continuous rolling, this method includes Following steps：
A, rolling pass reduction ratio and the finished product thickness of rolled piece according to each frame of tandem mill of setting, inverse workpiece thickness base The rolling pass drafts of quasi- value and each frame.
Assuming that workpiece thickness a reference value is hf, unit is millimeter；According to the setting principle of rolling mill practice, the first frame is arrived The rolling pass reduction ratio of 4th frame is followed successively by a%=45%, b%=42%, c%=40%, d%=38%；First machine Frame is followed successively by y to the rolling pass drafts of the 4th frame1、y2、y3、y4, unit is millimeter；The finished product thickness of rolled piece is hp=4 Millimeter.
Then workpiece thickness a reference value hfFor：
The rolling pass drafts of each frame is：
B, workpiece thickness a reference value is carried out roll-force check and to correct：First with the second-level model system of milling train Tube rolling simulation model, the roll-force to each passage is checked, and exceedes the maximum that frame allows if there is roll-force is calculated The situation of roll-force License Value, then reduce the drafts of the passage, and iterate calculating, is less than or equal to most until calculating roll-force Big roll-force License Value；Calculating is modified to workpiece thickness a reference value again, pricks thick to the middle base calculated in roughing mill Degree.
According to technique initialization, it is known that entrance rolling temperature, the finishing temperature of rolled piece, each frame of the middle base in Continuous mill train The technological parameter such as reduction in pass, and using the tube rolling simulation model in the second-level model system of milling train, can calculate First frame to the rolled piece of the 4th frame roll-force, it is assumed that the rolled piece of the first frame calculated to the 4th frame rolls Power processed is respectively f1=32,000 thousand Ns, f2=28,000 thousand Ns, f3=31,000 thousand Ns, f4=25,000 thousand Ns；The maximum of each frame Permit that roll-force is respectively F1max=F2max=F3max=F1max=30,000 thousand Ns.Transfinited in order to avoid roll-force occurs in each passage Phenomenon, progress judge as follows：
(1)f1＞ F1max, make y1Reduce 0.5 millimeter.
(2)f2＜ F2max, without the drafts for changing the second frame.
(3)f3＞ F3max, make y3Reduce 0.2 millimeter.
(4)f4＜ F4max, without the drafts for changing the 4th frame.
Judge more than, the roll-force of the first frame and the 3rd frame transfinite, it is necessary to reduce after drafts to this two The roll-force of individual frame is checked again.
The drafts y of revised first frame for the first time11=y1- 0.5=15.16-0.5=14.66 millimeters.Press herein Under lower amount, by the calculating of tube rolling simulation model, the roll-force f of the first frame by first time amendment11=29,500 thousand Ox, f11＜ F1max, the drafts amendment of the first frame finishes.
The drafts y of revised 3rd frame for the first time31=y3- 0.2=4.3-0.2=4.1 millimeters.In this drafts Under, by the calculating of tube rolling simulation model, the roll-force f of the 3rd frame by first time amendment31=30,200 thousand Ns.By In f31＞ F3max, need to continue to reduce drafts, i.e., the drafts y of second revised 3rd frame32=y31- 0.2=4.1- 0.2=3.9 millimeters.Under this drafts, by the calculating of tube rolling simulation model, by the 3rd frame of amendment for the second time Roll-force f32=29,200 thousand Ns, f32＜ F3max, the drafts amendment of the 3rd frame finishes.
After the roll-force of each passage no longer transfinites, it can be calculated by amendment according to revised each reduction in pass Workpiece thickness value hf1, unit is millimeter, and calculating formula is：
hf'=hp+y4+y32+y2+y11=4+2.45+3.9+7.78+14.66=32.79 millimeters；
Thus, middle base is pricked to 32.79 millimeters of thickness in roughing mill.
C, the workpiece thickness value according to obtained by amendment, from roughing mill to tandem mill between roller-way length and The ingot casting thickness come Extrusion ingot length is calculated, ingot casting is cast according to obtained extrusion ingot length is calculated.
Roller-way length (i.e. maximum allowable middle base length) between from roughing mill to tandem mill is Gmax=150000 millimeters； The thickness of ingot casting is H=600 millimeters；Extrusion ingot length is：
If the value of the L is without departing from the maximum extrusion ingot length value that founding process can be cast out, finally selected extrusion ingot length is The value., only need to be according to founding process institute energy if the maximum extrusion ingot length value that L value can be cast out beyond founding process The maximum extrusion ingot length value that casts out casts ingot casting.

Claims (4)

1. the control method of a kind of hot continuous rolling workpiece thickness and extrusion ingot length, it is characterised in that comprise the following steps：
A, rolling pass reduction ratio and the finished product thickness of rolled piece according to each frame of tandem mill of setting, inverse workpiece thickness base The rolling pass drafts of quasi- value and each frame；
B, workpiece thickness a reference value is carried out roll-force check and to correct：First with the rolling in the second-level model system of milling train Power computation model, the roll-force to each passage is checked, and exceedes the maximum rolling that frame allows if there is roll-force is calculated The situation of power License Value, then reduce the drafts of the passage, and iterate calculating, is rolled until calculating roll-force less than or equal to maximum Power License Value processed；Calculating is modified to workpiece thickness a reference value again, pricked in roughing mill to the workpiece thickness calculated；
C, the workpiece thickness value according to obtained by amendment, from roughing mill to tandem mill between roller-way length and The ingot casting thickness calculate Extrusion ingot length, ingot casting is cast according to obtained extrusion ingot length is calculated.
2. the control method of hot continuous rolling workpiece thickness according to claim 1 and extrusion ingot length, it is characterised in that：Tandem rolling Machine is using four frames, and according to the setting principle of rolling mill practice, the rolling pass reduction ratio of the first frame to the 4th frame is successively For a%, b%, c%, d%；The rolling pass drafts of first frame to the 4th frame is followed successively by y1、y2、y3、y4, unit is milli Rice；The finished product thickness of rolled piece is hp, unit is millimeter；Assuming that workpiece thickness a reference value is hf, unit is millimeter；Then in step A The calculating formula of workpiece thickness a reference value be：
The calculating formula of the rolling pass drafts of each frame is：
3. the control method of hot continuous rolling workpiece thickness according to claim 2 and extrusion ingot length, it is characterised in that：Step The specific method for carrying out roll-force check to workpiece thickness a reference value in B and correcting is as follows：
According to technique initialization, it is known that middle base is in the road of the entrance rolling temperature, the finishing temperature of rolled piece, each frame of Continuous mill train Secondary drafts technological parameter, and using the tube rolling simulation model in the second-level model system of milling train, calculate the first frame extremely The roll-force of the rolled piece of 4th frame, it is assumed that the roll-force of the rolled piece of the first frame calculated to the 4th frame is respectively f1、f2、f3、f4, unit is thousand Ns；The maximum license roll-force of each frame is respectively F1max、F2max、F3max、F4max, unit is thousand Ox；In order to avoid the phenomenon that roll-force transfinites occurs in each passage, progress judges as follows：
(1) if there is f1＞ F1maxWhen, then make y10.5 millimeter is reduced, roll-force check is carried out again, until roll-force is no longer Transfinite；
(2) if there is f2＞ F2maxWhen, then make y20.3 millimeter is reduced, roll-force check is carried out again, until roll-force is no longer Transfinite；
(3) if there is f3＞ F3maxWhen, then make y30.2 millimeter is reduced, roll-force check is carried out again, until roll-force is no longer Transfinite；
(4) if there is f4＞ F4maxWhen, then make y40.1 millimeter is reduced, roll-force check is carried out again, until roll-force is no longer Transfinite；
Assuming that the rolling pass drafts of the first frame to the 4th frame by n-th amendment is followed successively by y1n、y2n、y3n、y4n, Unit is millimeter；After the roll-force of each passage no longer transfinites, calculated according to revised each reduction in pass by amendment Workpiece thickness value h 'f, unit is millimeter, and calculating formula is：
h′f=hp+y4n+y3n+y2n+y1n。
4. the control method of hot continuous rolling workpiece thickness according to claim 3 and extrusion ingot length, it is characterised in that：Step The calculating formula of extrusion ingot length is in C：
Wherein, L is the length of ingot casting, and unit is millimeter；GmaxFor the roller-way length between from roughing mill to tandem mill, unit is milli Rice；H is the thickness of ingot casting, and unit is millimeter.
CN201710272775.8A 2017-04-24 2017-04-24 The control method of hot continuous rolling workpiece thickness and extrusion ingot length Active CN107030119B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112474826A (en) * 2020-10-27 2021-03-12 东北大学 Method for calculating thickness distribution of hot continuous rolling intermediate billet
CN113020286A (en) * 2021-02-05 2021-06-25 首钢集团有限公司 Stability control method and device in rolling process

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Publication number Priority date Publication date Assignee Title
JPS5841610A (en) * 1981-09-04 1983-03-10 Kawasaki Steel Corp Rolling method for thick plate
CN101337237A (en) * 2008-08-14 2009-01-07 苏州有色金属研究院有限公司 Thickness automatic allocation process of single-frame double coiling-aluminum hot milling roll
CN101382798A (en) * 2008-09-27 2009-03-11 苏州有色金属研究院有限公司 Process setting method for single-frame double-coiling aluminium hot-rolling mill
CN102728624A (en) * 2011-04-13 2012-10-17 宝山钢铁股份有限公司 Method for setting load distribution of finish rolling band steel
CN105107849A (en) * 2015-09-29 2015-12-02 东北大学 Hot continuous rolling intermediate billet thickness calculating method
CN105665443A (en) * 2016-03-30 2016-06-15 首钢总公司 Rolling technology of producing pipeline steel of extreme specifications through wide-heavy plate mill

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5841610A (en) * 1981-09-04 1983-03-10 Kawasaki Steel Corp Rolling method for thick plate
CN101337237A (en) * 2008-08-14 2009-01-07 苏州有色金属研究院有限公司 Thickness automatic allocation process of single-frame double coiling-aluminum hot milling roll
CN101382798A (en) * 2008-09-27 2009-03-11 苏州有色金属研究院有限公司 Process setting method for single-frame double-coiling aluminium hot-rolling mill
CN102728624A (en) * 2011-04-13 2012-10-17 宝山钢铁股份有限公司 Method for setting load distribution of finish rolling band steel
CN105107849A (en) * 2015-09-29 2015-12-02 东北大学 Hot continuous rolling intermediate billet thickness calculating method
CN105665443A (en) * 2016-03-30 2016-06-15 首钢总公司 Rolling technology of producing pipeline steel of extreme specifications through wide-heavy plate mill

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112474826A (en) * 2020-10-27 2021-03-12 东北大学 Method for calculating thickness distribution of hot continuous rolling intermediate billet
CN112474826B (en) * 2020-10-27 2021-10-22 东北大学 Method for calculating thickness distribution of hot continuous rolling intermediate billet
CN113020286A (en) * 2021-02-05 2021-06-25 首钢集团有限公司 Stability control method and device in rolling process
CN113020286B (en) * 2021-02-05 2023-09-15 首钢集团有限公司 Stability control method and device for rolling process

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