CN107030119B - 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
CN107030119B
CN107030119B CN201710272775.8A CN201710272775A CN107030119B CN 107030119 B CN107030119 B CN 107030119B CN 201710272775 A CN201710272775 A CN 201710272775A CN 107030119 B CN107030119 B CN 107030119B
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rack
force
roll
workpiece thickness
rolling
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CN107030119A (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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Abstract

The invention discloses the control methods 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 finished product thickness of the rolling pass reduction rate and rolled piece of each rack of tandem mill of setting, the rolling pass drafts of inverse workpiece thickness a reference value and each rack；Roll-force check is carried out to workpiece thickness a reference value and is corrected, the case where if there is maximum rolling force License Value of the roll-force more than rack permission is calculated, the drafts for then reducing 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, is pricked to the workpiece thickness calculated in roughing mill；According to correct the workpiece thickness value of gained, from roughing mill to tandem mill between roller-way length and The ingot casting thickness calculate extrusion ingot length, according to the extrusion ingot length being calculated cast ingot casting.The present invention solves the problems, such as that 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
Currently, the workpiece thickness setting value of hot continuous rolling is estimated according to knowhow by the technical staff of factory , there is prodigious uncertainty.This workpiece thickness setting value estimated by rule of thumb can cause problems with：In the middle Between base thickness setting value it is bigger than normal when, each rack pressure load may be caused to transfinite and cause 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 increases milling train work( Consumption, and reduce production efficiency.Load is less than normal is also possible to cause to skid between the roll of Continuous mill train and band for pressure, makes The operation of rolling tends to unstable state.Further, since manually there are relatively large deviations for estimation workpiece thickness setting value, further add The big design error of extrusion ingot length.When the extrusion ingot length manually estimated is long, the length for intermediate base easily occur exceeds roughing Roller-way allows the phenomenon that length between machine and tandem mill, and site operation personnel is forced to increase the thickness of intermediate base, leads to tandem mill frame Pressure load transfinites, or takes the measure for increasing in rough rolling process and cutting damage amount end to end, can reduce yield rate in this way.Work as ingot casting When length is too short, yield rate can be also reduced.
Invention content
The object of the present invention is to provide the control methods of a kind of hot continuous rolling workpiece thickness and extrusion ingot length, and this method can To solve the problems, such as that existing hot continuous rolling production yield rate is low.
To solve the above-mentioned 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 includes the following steps：
A, according to the finished product thickness of the rolling pass reduction rate and rolled piece of each rack of the tandem mill of setting, inverse centre base is thick Spend the rolling pass drafts of a reference value and each rack；
B, roll-force check is carried out to workpiece thickness a reference value and corrected：First in the second-level model system of milling train Tube rolling simulation model checks the roll-force of each passage, is more than the maximum that rack allows if there is roll-force is calculated The case where roll-force License Value, then reduces 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, it is thick to be rolled to calculated intermediate base in roughing mill Degree；
C, according to correct gained workpiece thickness value, 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 the extrusion ingot length being calculated.
In the technical solution of the control method of above-mentioned hot continuous rolling workpiece thickness and extrusion ingot length, more specific technical solution It can also be：Tandem mill uses four racks, according to the setting principle of rolling mill practice, the first rack to the rolling road of the 4th rack Secondary reduction ratio is followed successively by a%, b%, c%, d%；The rolling pass drafts of first rack to the 4th rack 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 rack is：
Further, roll-force check is carried out to workpiece thickness a reference value in step B and modified the specific method is as follows：
According to technique initialization, it is known that entrance rolling temperature, the finishing temperature of rolled piece, each rack of the intermediate base in Continuous mill train Reduction in pass technological parameter, and using milling train second-level model system in tube rolling simulation model, calculate the first machine Frame to the rolled piece of the 4th rack roll-force, it is assumed that the roll-force of the rolled piece of the first rack calculated to the 4th rack point It Wei not f1、f2、f3、f4, unit is thousand Ns；The maximum license roll-force of each rack is respectively F1max、F2max、F3max、F4max, unit It is thousand Ns.In order to avoid the phenomenon that roll-force transfinites occurs in each passage, judge as follows：
(1) if there is f1> F1maxWhen, then enable y10.5 millimeter is reduced, carries out roll-force check again, until roll-force No longer transfinite；
(2) if there is f2> F2maxWhen, then enable y20.3 millimeter is reduced, carries out roll-force check again, until roll-force No longer transfinite；
(3) if there is f3> F3maxWhen, then enable y30.2 millimeter is reduced, carries out roll-force check again, until roll-force No longer transfinite；
(4) if there is f4> F4maxWhen, then enable y40.1 millimeter is reduced, carries out roll-force check again, until roll-force No longer transfinite；
Assuming that the rolling pass drafts by n-th modified first rack to the 4th rack 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 repairing Positive workpiece thickness value h 'f, unit is millimeter, and calculating formula is：
h′f=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 For millimeter；H is the thickness of ingot casting, and unit is millimeter.Longer according to ingot casting, the higher principle of yield rate, i.e., intermediate base length is just The good roller-way between roughing mill and tandem mill allows to put that the maximum length value of intermediate base is equal considers, from roughing mill to tandem mill Between roller-way length, that is, maximum allowable intermediate base length.If the value of the L is without departing from the maximum casting that founding process can be cast out Ingot length value, then finally selected extrusion ingot length is the value.If the value of L has exceeded the maximum ingot casting that founding process can be cast out Length 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 the thickness of intermediate base, since the length of ingot casting can pass through casting process And the amount of sawing end to end of ingot casting controls, and thickness is determined by the crystallizer specification of founding process, cannot arbitrarily be changed, Therefore the present invention considers the thickness of ingot casting being considered as given value, only carries out calculation and check to the length of ingot casting.
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 for crossing three above step, obtain optimal workpiece thickness and corresponding thereto The optimal extrusion ingot length answered can prevent the operation of rolling negative due to depressing under the premise of ensureing product mechanical property index Lotus transfinites and interrupts, and avoids the generation of equipment breakdown, at the same avoid since extrusion ingot length and workpiece thickness mismatch and That brings additionally cuts damage end to end, improves yield rate.
Specific implementation mode
With reference to embodiment, the invention will be further described：
The hot continuous rolling workpiece thickness of the present embodiment and the control method of extrusion ingot length, using " 1+4 " hot continuous rolling, this method Include the following steps：
A, according to the finished product thickness of the rolling pass reduction rate and rolled piece of each rack of the tandem mill of setting, inverse centre base is thick Spend the rolling pass drafts of a reference value and each rack.
Assuming that workpiece thickness a reference value is hf, unit is millimeter；According to the setting principle of rolling mill practice, the first rack arrives The rolling pass reduction rate of 4th rack is followed successively by a%=45%, b%=42%, c%=40%, d%=38%；First machine The rolling pass drafts of frame to the 4th rack is followed successively by y1、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 rack is：
B, roll-force check is carried out to workpiece thickness a reference value and corrected：First in the second-level model system of milling train Tube rolling simulation model checks the roll-force of each passage, is more than the maximum that rack allows if there is roll-force is calculated The case where roll-force License Value, then reduces 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, it is thick to be rolled to calculated intermediate base in roughing mill Degree.
According to technique initialization, it is known that entrance rolling temperature, the finishing temperature of rolled piece, each rack of the intermediate base in Continuous mill train The technological parameters such as reduction in pass, and using the tube rolling simulation model in the second-level model system of milling train, can calculate First rack to the rolled piece of the 4th rack roll-force, it is assumed that the rolled piece of the first rack calculated to the 4th rack 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 rack Permit that roll-force is respectively F1max=F2max=F3max=F1max=30,000 thousand Ns.It transfinites in order to avoid roll-force occurs in each passage The phenomenon that, judge as follows：
(1)f1> F1max, enable y1Reduce 0.5 millimeter.
(2)f2< F2max, do not have to the drafts for changing the second rack.
(3)f3> F3max, enable y3Reduce 0.2 millimeter.
(4)f4< F4max, do not have to the drafts for changing the 4th rack.
By judging above it is found that the roll-force of the first rack and third rack transfinites, need to reduce after drafts to this two The roll-force of a rack is checked again.
The drafts y of revised first rack for the first time11=y1- 0.5=15.16-0.5=14.66 millimeters.It presses herein Under lower amount, by the calculating of tube rolling simulation model, by the roll-force f of modified first rack for the first time11=29,500 thousand Ox, f11< F1max, the drafts amendment of the first rack finishes.
The drafts y of revised third rack 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, by the roll-force f of modified third rack for the first time31=30,200 thousand Ns.By In f31> F3max, need to continue to reduce drafts, i.e., the drafts y of second revised third rack32=y31- 0.2=4.1- 0.2=3.9 millimeters.Under this drafts, by the calculating of tube rolling simulation model, by modified third rack for the second time Roll-force f32=29,200 thousand Ns, f32< F3max, the drafts amendment of third rack finishes.
After the roll-force of each passage no longer transfinites, it can be calculated by modified according to revised each reduction in pass Workpiece thickness value h 'f, unit is millimeter, and calculating formula is：
h′f=hp+y4+y32+y2+y11=4+2.45+3.9+7.78+14.66=32.79 millimeters；
Intermediate base is rolled to in roughing mill 32.79 millimeters of thickness as a result,.
C, according to correct gained workpiece thickness value, 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 the extrusion ingot length being calculated.
Roller-way length (i.e. maximum allowable intermediate 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 ingot casting is long Degree is the value.It, only need to be according to founding process if the value of L has exceeded the maximum extrusion ingot length value that founding process can be cast out The maximum extrusion ingot length value that can cast 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 include the following steps：
A, according to the finished product thickness of the rolling pass reduction rate and rolled piece of each rack of the tandem mill of setting, inverse workpiece thickness base The rolling pass drafts of quasi- value and each rack；
B, roll-force check is carried out to workpiece thickness a reference value and corrected：First with the rolling in the second-level model system of milling train Power computation model checks the roll-force of each passage, is more than the maximum rolling that rack allows if there is roll-force is calculated The case where power License Value, then reduces the drafts of the passage, and iterate calculating, is rolled less than or equal to maximum until calculating roll-force Power License Value processed；Calculating is modified to workpiece thickness a reference value again, calculated workpiece thickness is rolled in roughing mill；
C, according to correct the workpiece thickness value of gained, from roughing mill to tandem mill between roller-way length and The ingot casting thickness calculate Extrusion ingot length casts ingot casting according to the extrusion ingot length being 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 uses four racks, and according to the setting principle of rolling mill practice, the rolling pass reduction rate of the first rack to the 4th rack is successively For a%, b%, c%, d%；The rolling pass drafts of first rack to the 4th rack 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 rack 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 Roll-force check is carried out to workpiece thickness a reference value in B and modified the specific method is as follows：
According to technique initialization, it is known that intermediate base is in the entrance rolling temperature of Continuous mill train, the road of the finishing temperature of rolled piece, each rack Secondary drafts technological parameter, and using the tube rolling simulation model in the second-level model system of milling train, calculate the first rack extremely The roll-force of the rolled piece of 4th rack, it is assumed that the roll-force of the rolled piece of the first rack calculated to the 4th rack is respectively f1、f2、f3、f4, unit is thousand Ns；The maximum license roll-force of each rack is respectively F1max、F2max、F3max、F4max, unit thousand Ox；In order to avoid the phenomenon that roll-force transfinites occurs in each passage, judge as follows：
(1) if there is f1> F1maxWhen, then enable y10.5 millimeter is reduced, carries out roll-force check again, until roll-force is no longer It transfinites；
(2) if there is f2> F2maxWhen, then enable y20.3 millimeter is reduced, carries out roll-force check again, until roll-force is no longer It transfinites；
(3) if there is f3> F3maxWhen, then enable y30.2 millimeter is reduced, carries out roll-force check again, until roll-force is no longer It transfinites；
(4) if there is f4> F4maxWhen, then enable y40.1 millimeter is reduced, carries out roll-force check again, until roll-force is no longer It transfinites；
Assuming that the rolling pass drafts by n-th modified first rack to the 4th rack 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 correcting Workpiece thickness value hf', unit is millimeter, and calculating formula is：
hf'=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 examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112474826B (en) * 2020-10-27 2021-10-22 东北大学 Method for calculating thickness distribution of hot continuous rolling intermediate billet
CN113020286B (en) * 2021-02-05 2023-09-15 首钢集团有限公司 Stability control method and device for rolling process

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

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

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