CN110614279B - Automatic head and tail pressing control method for single-stand roughing mill - Google Patents
Automatic head and tail pressing control method for single-stand roughing mill Download PDFInfo
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- CN110614279B CN110614279B CN201910845406.2A CN201910845406A CN110614279B CN 110614279 B CN110614279 B CN 110614279B CN 201910845406 A CN201910845406 A CN 201910845406A CN 110614279 B CN110614279 B CN 110614279B
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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
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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
- B21B37/72—Rear end control; Front end control
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Abstract
The invention provides an automatic head and tail pressing control method for a single-stand roughing mill, and belongs to the technical field of metal processing. The method comprises the steps of firstly calculating the dynamic adjustment time of a pressure head roll gap and a tail pressing roll gap according to the set lengths of a pressure head wedge-shaped section and a tail pressing wedge-shaped section, then calculating the roll gap adjustment amount corresponding to the set values of the pressure head amount and the tail pressing amount, calculating the adjustment step length of the pressure head roll gap and the tail pressing roll gap in each PLC scanning period according to the dynamic adjustment time and the roll gap adjustment amount of the roll gap, calculating the length of a rolled piece before rolling corresponding to the length by the set lengths of the tail pressing parallel section and the tail pressing wedge-shaped section, and finally controlling the lifting and the pressing actions of the roll gap by tracking the rolled length of the rolled piece and the length to be rolled at the tail. The method changes the thickness and shape of the head and the tail by changing the lengths of the flat traveling section and the wedge-shaped section and the tail pressing amount of the pressure head, is flexible and convenient, and can meet the requirements of the pressure head and the tail pressing under different working conditions on a production field.
Description
Technical Field
The invention relates to the technical field of metal processing, in particular to an automatic head and tail pressing control method for a single-stand roughing mill.
Background
Rough rolling is an important process in the process of hot rolling metal, a raw material plate blank is reversibly rolled by a rough rolling mill to produce an intermediate blank or plate with a thin thickness, and the intermediate blank is sent to a finishing mill group for continuous rolling and coiled by a coiling machine. In the rolling process of a rough rolling mill, the end parts (head part and tail part) of a plate blank can generate various irregular shapes, in order to enable the plate blank to smoothly enter a finish rolling mill and ensure the end parts of a plate strip to be level, the head and the tail of an intermediate blank need to be sheared, and a proper pressure head of the intermediate blank presses the tail, so that the weight of scrap materials sheared by the head and the tail can be reduced, and the yield is improved; under normal conditions, the head and tail temperature of the plate blank is lower, and the biting speed and the throwing speed of a roughing mill are lower, so that the head and tail thickness of the intermediate blank is thicker, the control of the finish rolling thickness is adversely affected, and the head and tail thickness out-of-tolerance can be improved by proper pressure head tail pressing of the intermediate blank; the thickness of the intermediate billet cannot be too thin due to the limitation of the lengths of the roller ways before and after rough rolling, the head of the intermediate billet is thick, the head of the finishing mill cannot be bitten into the intermediate billet, and the head of the finishing mill cannot be bitten into the intermediate billet.
The rough rolling mill head and tail pressing method generally comprises the steps of roughly setting a head and tail pressing amount, and then simply controlling the roll gap of the rolling mill to be lifted up or pressed down according to a certain slope, but for different alloys and different thickness and width specifications, the head and tail pressing length and the head and tail pressing amount are not fixed, so that a flexible and accurate head and tail pressing control method is needed to meet different field process requirements.
Disclosure of Invention
The invention aims to solve the technical problem of providing an automatic head and tail pressing control method for a single-stand roughing mill, which realizes different shapes of the pressing head pressing tail by controlling the lengths of the parallel section and the wedge-shaped section of the pressing head pressing tail and the pressing head pressing tail amount, and is flexible and convenient.
The method comprises the following steps:
s1: setting the length L according to the wedge-shaped section of the pressure head2Setting length L of pressing tail wedge-shaped section4Calculating the dynamic adjustment time t of the roll gap of the pressure headheadAnd the dynamic adjustment time t of the tail pressing roll gaptailThe calculation formula is as follows:
thead＝L2/[v1(1+f)]，ttail＝L4/[v2(1+f)]，
in the formula, v1Setting value v for the bite speed of the rolling mill2Setting the throwing speed of the rolling mill, wherein f is a forward slip value;
s2: according to the functional relation between the thickness of the rolled piece and the roll gap of the rolling mill in the spring equation of the rolling mill, calculating the pressure head quantity set value delta HheadAnd tail-pressing amount set value delta HtailCorresponding roll gap adjustment quantity Delta SheadAnd Δ StailThe calculation formula is as follows: delta Shead＝ΔHhead(1-CQ/CM)，ΔStail＝ΔHtail(1-CQ/CM)，
In the formula, CQ is the plasticity coefficient of a rolled piece, and CM is the rigidity coefficient of a rolling mill;
s3: according to the roll gap dynamic adjustment time and the roll gap adjustment amount obtained in S1 and S2, calculatingPressure head roll gap adjusting step length delta S of each PLC scanning periodshAdjusting step length delta S of pinch roll gapstThe calculation formula is as follows: delta Ssh＝ΔShead·ts/thead，ΔSst＝ΔStail·ts/ttail，
In the formula, tsThe scanning period of the PLC controller;
s4: the length L is set by the tail pressing parallel section according to the principle that the volumes of the rolled pieces in the same section are equal before and after rolling3Setting length L of pressing tail wedge-shaped section4Calculating the corresponding length L of the rolled piece before rollingtailThe calculation formula is as follows: l istail＝[L3(h-ΔHtail)+L4(2h-ΔHtail)/2]/H，
In the formula, H is the thickness of the rolled piece after rolling, and H is the thickness of the rolled piece before rolling;
s5: preset roll gap S issued by L2 process control system0Minus Δ SheadAs a target roll gap, finishing pre-swinging of the roll gap of the rolling mill before rolling;
s6: after the rolling mill bites in, the rolled piece begins to be rolled for a length HMTKPerforming tracking when HMTKEqual to the length L of the parallel segment of the pressure head1At the beginning of the rolling mill roll gap by Delta SshLifting the step length, when the total adjustment amount of the roll gap is equal to delta SheadWhen the roll gap uplifting action is stopped, wherein HMTKThe calculation formula of (2) is as follows: hMTK═ v (1+ f) dt, where v is the mill actual line speed;
s7: when the tail part of the rolled piece leaves the position detection instrument MD of the rolled piece closest to the rolling mill on the inlet side of the rolling mill, the tail part of the rolled piece is started to remain the length T to be rolledMTKPerforming tracking when T isMTKIs equal to LtailAt the beginning of the rolling mill roll gap by Delta SstStep-length pressing, when the total adjustment amount of the roll gap pressing is equal to Delta StailAt the same time, the roll gap depressing action is stopped, wherein TMTKThe calculation formula of (2) is as follows: t isMTK＝LMD-∫v(1-β)dt，
In the formula, LMDThe distance between a rolled piece position detecting instrument MD and a roughing mill is β, and the value is a backward slip value。
The set values of the length of the wedge-shaped segment of the pressure head and the length of the wedge-shaped segment of the pressure tail in the S1 are limited by the minimum value, the minimum value is related to the maximum adjustment step length of the roll gap of the rolling mill in each PLC scanning period and the rolling speed, and the set length minimum value L of the wedge-shaped segment of the pressure head2_min＝v1(1+f)ΔSheadts/ΔSs_maxSetting the minimum length L of the tail pressing wedge-shaped section4min＝v2(1+f)ΔStailts/ΔSs_max，
Wherein: delta Ss_maxAnd adjusting the step length for the roll gap of the rolling mill to the maximum extent in each PLC scanning period.
And in the S5, the roll gap of the rolling mill consists of an electric roll gap and a hydraulic roll gap, the roll gap is adjusted by the hydraulic roll gap in the tail pressing process, and the electric roll gap is kept constant in the process.
In S7, the inlet direction of the rolling mill is consistent with the rolling direction, if the rolling direction is from left to right, the left side of the rolling mill is the inlet direction, if the rolling direction is from right to left, the right side of the rolling mill is the inlet direction, and the rolled piece position detectors are arranged on the two sides of the roughing mill.
The rolled piece position detecting instrument is generally a hot metal detector or a cold metal detector, and the distance range between the rolled piece position detecting instrument and the rolling mill is 5.0-10.0 m.
L above1、L2、L3、L4、ΔHheadAnd Δ HtailThe L2 process control system classifies and issues according to different alloys, different thicknesses and different widths, and an operator can perform L comparison on an HMI picture1、L2、L3、L4、ΔHheadAnd Δ HtailManual intervention of the parameter settings, where Δ HheadAnd Δ HtailThe value range of (A) is 0.0-5.0 mm.
And in the tail pressing process of the pressure head, the speed of the rolling mill is kept constant, and the AGC thickness control function is not put into use in the process.
The method is used for a single-stand reversible roughing mill for steel rolling and a single-stand reversible roughing mill for nonferrous metal rolling.
The technical scheme of the invention has the following beneficial effects:
in the scheme, the different head and tail thickness shapes of the rolled piece can be realized according to the flexibly set pressure head and tail pressing length and the pressure head and tail pressing amount of different product specifications, and the head and tail pressing process is accurately controlled by tracking the head and tail length of the rolled piece. The method is simple, flexible and convenient to implement, can be implemented on the premise of not increasing any hardware, and has a good effect.
Drawings
FIG. 1 is a process diagram of the automatic head tail control method of the single stand roughing mill of the present invention;
FIG. 2 is a control flow chart of the automatic head tail control method of the single-stand roughing mill of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides an automatic head and tail pressing control method for a single-stand roughing mill.
As shown in fig. 2, the method comprises the steps of:
s1: setting the length L according to the wedge-shaped section of the pressure head2Setting length L of pressing tail wedge-shaped section4Calculating the dynamic adjustment time t of the roll gap of the pressure headheadAnd the dynamic adjustment time t of the tail pressing roll gaptailThe calculation formula is as follows:
thead＝L2/[v1(1+f)]，ttail＝L4/[v2(1+f)]，
in the formula, v1Setting value v for the bite speed of the rolling mill2Setting the throwing speed of the rolling mill, wherein f is a forward slip value;
s2: according to the functional relation between the thickness of the rolled piece and the roll gap of the rolling mill in the spring equation of the rolling mill, calculating the pressure head quantity set value delta HheadAnd tail-pressing amount set value delta HtailCorresponding roll gap adjustment quantity Delta SheadAnd Δ StailThe calculation formula is as follows: delta Shead＝ΔHhead(1-CQ/CM)，ΔStail＝ΔHtail(1-CQ/CM)，
In the formula, CQ is the plasticity coefficient of a rolled piece, and CM is the rigidity coefficient of a rolling mill;
s3: calculating the adjustment step length delta S of the roll gap of the pressure head in each PLC scanning period according to the dynamic adjustment time and the adjustment quantity of the roll gap obtained in S1 and S2shAdjusting step length delta S of pinch roll gapstThe calculation formula is as follows: delta Ssh＝ΔShead·ts/thead，ΔSst＝ΔStail·ts/ttail，
In the formula, tsThe scanning period of the PLC controller;
s4: the length L is set by the tail pressing parallel section according to the principle that the volumes of the rolled pieces in the same section are equal before and after rolling3Setting length L of pressing tail wedge-shaped section4Calculating the corresponding length L of the rolled piece before rollingtailThe calculation formula is as follows: l istail＝[L3(h-ΔHtail)+L4(2h-ΔHtail)/2]/H，
In the formula, H is the thickness of the rolled piece after rolling, and H is the thickness of the rolled piece before rolling;
s5: preset roll gap S issued by L2 process control system0Minus Δ SheadAs a target roll gap, finishing pre-swinging of the roll gap of the rolling mill before rolling;
s6: after the rolling mill bites in, the rolled piece begins to be rolled for a length HMTKPerforming tracking when HMTKEqual to the length L of the parallel segment of the pressure head1At the beginning of the rolling mill roll gap by Delta SshLifting the step length, when the total adjustment amount of the roll gap is equal to delta SheadWhen the roll gap uplifting action is stopped, wherein HMTKThe calculation formula of (2) is as follows: hMTK═ v (1+ f) dt, where v is the mill actual line speed;
s7: when the tail part of the rolled piece leaves the position detection instrument MD of the rolled piece closest to the rolling mill on the inlet side of the rolling mill, the tail part of the rolled piece is started to remain the length T to be rolledMTKPerforming tracking when T isMTKIs equal to LtailAt the beginning of the rolling mill roll gap by Delta SstStep-length pressing, when the total adjustment amount of the roll gap pressing is equal to Delta StailWhile stopping the roll gapA pressing action, wherein TMTKThe calculation formula of (2) is as follows: t isMTK＝LMD-∫v(1-β)dt，
In the formula, LMDThe distance between the rolled piece position detecting instrument MD and the roughing mill is β, and the backward slip value is obtained.
The inlet direction of the rolling mill is consistent with the rolling direction, if the rolling direction is from left to right, the left side of the rolling mill is the inlet direction, if the rolling direction is from right to left, the right side of the rolling mill is the inlet direction, and the rolled piece position detecting meters are arranged on the two sides of the roughing mill.
The rolled piece position detecting instrument is generally a hot metal detector or a cold metal detector, and the distance range between the rolled piece position detecting instrument and the rolling mill is 5.0-10.0 m.
L above1、L2、L3、L4、ΔHheadAnd Δ HtailThe L2 process control system classifies and issues according to different alloys, different thicknesses and different widths, and an operator can perform L comparison on an HMI picture1、L2、L3、L4、ΔHheadAnd Δ HtailManual intervention of the parameter settings, where Δ HheadAnd Δ HtailThe value range of (A) is 0.0-5.0 mm.
And in the tail pressing process of the pressure head, the speed of the rolling mill is kept constant, and the AGC thickness control function is not put into use in the process.
The method is used for a single-stand reversible roughing mill for steel rolling and a single-stand reversible roughing mill for nonferrous metal rolling.
The following description is given with reference to specific examples.
The scheme is implemented on a single-stand reversible rough rolling mill on a 1+7 hot continuous rolling production line of a certain steel mill, the thickness of a raw material plate blank is 220.0mm, the width is 1650.0mm, the length is 8500mm, the target thickness of an intermediate blank is 35.0mm, the steel grade is Q235B, the number of times of a rough rolling total rolling pass is 7, the head and the tail of the pressure are actually applied in the last pass, and a parameter L is controlled1＝1.0m，L2＝0.8m，L3＝1.5m，L4＝1.0m，ΔHhead＝2.0mm，ΔHtail＝2.0mm。
As shown in fig. 1, the specific implementation steps are as follows:
the method comprises the following steps: setting the length L according to the wedge-shaped section of the pressure head2Length L of wedge-shaped pressing tail section4Calculating the dynamic adjustment time t of the roll gap of the pressure headheadAnd the dynamic adjustment time t of the tail pressing roll gaptailThe calculation formula is as follows: t is thead＝L2/[v1(1+f)]，ttail＝L4/[v2(1+f)]，
In the formula, v1The biting speed of the rolling mill is 1.5m/s, v2The throwing speed of the rolling mill is set to be 2.0m/s, f is a forward slip value and is set to be 0.11;
the set values of the length of the wedge-shaped section of the pressure head and the length of the wedge-shaped section of the pressure tail are limited by the minimum value, the minimum value is related to the maximum adjustment step length of each PLC scanning period of the roll gap of the rolling mill and the rolling speed, and the set length of the wedge-shaped section of the pressure head is the minimum value L2_min＝v1(1+f)ΔSheadts/ΔSs_maxSetting the minimum length L of the tail pressing wedge-shaped section4min＝v2(1+f)ΔStailts/ΔSs_max，
Wherein: delta Ss_maxThe maximum adjustment step length of the roll gap of the rolling mill in each PLC scanning period is 0.02 mm.
Step two: calculating the set value delta H of the pressure head quantity according to the functional relation between the thickness of the rolled piece and the roll gap of the rolling mill in the spring equation of the rolling millheadAnd tail-pressing amount set value delta HtailCorresponding roll gap adjustment quantity Delta SheadAnd Δ StailThe calculation formula is as follows: delta Shead＝ΔHhead(1-CQ/CM)，ΔStail＝ΔHtail(1-CQ/CM)，
In the formula, CQ is the plastic coefficient of a rolled piece and takes the value of 187.0t/mm, CM is the rigidity coefficient of a rolling mill and takes the value of 550.0 t/mm;
step three: according to the dynamic roll gap adjusting time and the roll gap adjusting quantity, calculating the pressure head roll gap adjusting step length delta S of each PLC scanning periodshAdjusting step length delta S of pinch roll gapstThe calculation formula is as follows: delta Ssh＝ΔShead·ts/thead，ΔSst＝ΔStail·ts/ttail，
In the formula, tsThe scanning period of the PLC controller is 0.004 s;
step four: the length L is set by the tail pressing parallel section according to the principle that the volumes of the rolled pieces in the same section are equal before and after rolling3Setting length L of pressing tail wedge-shaped section4Calculating the corresponding length L of the rolled piece before rollingtailThe calculation formula is as follows: l istail＝[L3(h-ΔHtail)+L4(2h-ΔHtail)/2]/H，
In the formula, H is the thickness of the rolled piece after rolling and is 35.0mm, and H is the thickness of the rolled piece before rolling and is 44.5 mm;
step five: preset roll gap S issued by L2 process control system0Minus Δ SheadAs a target roll gap, a pre-swing of the roll gap of the rolling mill before rolling is completed, wherein S0The value is 36.7mm, the roll gap of the rolling mill consists of an electric roll gap and a hydraulic roll gap, the roll gap is adjusted by the hydraulic roll gap in the tail pressing process of the pressing head, and the electric roll gap is kept constant in the process;
step six: after the rolling mill bites in, the rolled piece begins to be rolled for a length HMTKPerforming tracking when HMTKEqual to the length L of the parallel segment of the pressure head1At the beginning of the rolling mill roll gap by Delta SshLifting the step length, stopping the lifting action of the roll gap when the total adjustment amount of the lifting of the roll gap is equal to delta shear, wherein HMTKThe calculation formula of (2) is as follows: hMTK＝∫v(1+f)dt，
Wherein v is the actual linear speed of the rolling mill;
step seven: when the tail part of the rolled piece leaves the position detection instrument MD of the rolled piece closest to the rolling mill on the inlet side of the rolling mill, the tail part of the rolled piece is started to remain the length T to be rolledMTKPerforming tracking when T isMTKIs equal to LtailAt the beginning of the rolling mill roll gap by Delta SstStep-length pressing, when the total adjustment amount of the roll gap pressing is equal to Delta StailAt the same time, the roll gap depressing action is stopped, wherein TMTKThe calculation formula of (2) is as follows: t isMTK＝LMD-∫v(1-β)dt，
In the formula, LMDThe distance between a rolled piece position detection instrument MD and a roughing mill is 6.5m, and β is a backward slip value which is 0.13.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. An automatic head and tail pressing control method for a single-frame roughing mill is characterized by comprising the following steps: the method comprises the following steps:
s1: setting the length L according to the wedge-shaped section of the pressure head2Setting length L of pressing tail wedge-shaped section4Calculating the dynamic adjustment time t of the roll gap of the pressure headheadAnd the dynamic adjustment time t of the tail pressing roll gaptailThe calculation formula is as follows:
thead＝L2/[v1(1+f)]，ttail＝L4/[v2(1+f)]，
in the formula, v1Setting value v for the bite speed of the rolling mill2Setting the throwing speed of the rolling mill, wherein f is a forward slip value;
s2: according to the functional relation between the thickness of the rolled piece and the roll gap of the rolling mill in the spring equation of the rolling mill, calculating the pressure head quantity set value delta HheadAnd tail-pressing amount set value delta HtailCorresponding roll gap adjustment quantity Delta SheadAnd Δ StailThe calculation formula is as follows: delta Shead＝ΔHhead(1-CQ/CM)，ΔStail＝ΔHtail(1-CQ/CM)，
In the formula, CQ is the plasticity coefficient of a rolled piece, and CM is the rigidity coefficient of a rolling mill;
s3: calculating the adjustment step length delta S of the roll gap of the pressure head in each PLC scanning period according to the dynamic adjustment time and the adjustment quantity of the roll gap obtained in S1 and S2shAdjusting step length delta S of pinch roll gapstThe calculation formula is as follows: delta Ssh＝ΔShead·ts/thead，ΔSst＝ΔStail·ts/ttail，
In the formula, tsThe scanning period of the PLC controller;
s4: the length L is set by the tail pressing parallel section according to the principle that the volumes of the rolled pieces in the same section are equal before and after rolling3Setting length L of pressing tail wedge-shaped section4Calculating the corresponding length L of the rolled piece before rollingtailThe calculation formula is as follows: l istail＝[L3(h-ΔHtail)+L4(2h-ΔHtail)/2]/H，
In the formula, H is the thickness of the rolled piece after rolling, and H is the thickness of the rolled piece before rolling;
s5: preset roll gap S issued by L2 process control system0Minus Δ SheadAs a target roll gap, finishing pre-swinging of the roll gap of the rolling mill before rolling;
s6: after the rolling mill bites in, the rolled piece begins to be rolled for a length HMTKPerforming tracking when HMTKEqual to the length L of the parallel segment of the pressure head1At the beginning of the rolling mill roll gap by Delta SshLifting the step length, when the total adjustment amount of the roll gap is equal to delta SheadWhen the roll gap uplifting action is stopped, wherein HMTKThe calculation formula of (2) is as follows: hMTK＝∫v(1+f)dt，
Wherein v is the actual linear speed of the rolling mill;
s7: when the tail part of the rolled piece leaves the position detection instrument MD of the rolled piece closest to the rolling mill on the inlet side of the rolling mill, the tail part of the rolled piece is started to remain the length T to be rolledMTKPerforming tracking when T isMTKIs equal to LtailAt the beginning of the rolling mill roll gap by Delta SstStep-length pressing, when the total adjustment amount of the roll gap pressing is equal to Delta StailAt the same time, the roll gap depressing action is stopped, wherein TMTKThe calculation formula of (2) is as follows: t isMTK＝LMD-∫v(1-β)dt，
In the formula, LMDThe distance between the rolled piece position detecting instrument MD and the roughing mill is β, and the backward slip value is obtained.
2. The automatic head and tail pressing control method of the single-stand roughing mill according to claim 1, characterized in that: the minimum value L of the set length of the wedge-shaped section of the middle pressure head in S12_min＝v1(1+f)ΔSheadts/ΔSs_maxSetting the minimum length L of the tail pressing wedge-shaped section4min＝v2(1+f)ΔStailts/ΔSs_max，
Wherein: delta Ss_maxAnd adjusting the step length for the roll gap of the rolling mill to the maximum extent in each PLC scanning period.
3. The automatic head and tail pressing control method of the single-stand roughing mill according to claim 1, characterized in that: the roll gap of the rolling mill in the S5 is composed of an electric roll gap and a hydraulic roll gap, the roll gap is adjusted in the tail pressing process of the pressing head through the hydraulic roll gap, and in the process, the electric roll gap is kept constant.
4. The automatic head and tail pressing control method of the single-stand roughing mill according to claim 1, characterized in that: and in the S7, the inlet direction of the rolling mill is consistent with the rolling direction, and the rolled piece position detection instruments are arranged on two sides of the roughing mill.
5. The automatic head and tail pressing control method of the single-stand roughing mill according to claim 4, characterized in that: the rolled piece position detection instrument is a hot metal detector or a cold metal detector, and the distance range between the rolled piece position detection instrument and the rolling mill is 5.0-10.0 m.
6. The automatic head and tail pressing control method of the single-stand roughing mill according to claim 1, characterized in that: said L1、L2、L3、L4、ΔHheadAnd Δ HtailThe L2 process control system classifies and issues according to different alloys, different thicknesses and different widths, and an operator can perform L comparison on an HMI picture1、L2、L3、L4、ΔHheadAnd Δ HtailManual intervention of the parameter settings, where Δ HheadAnd Δ HtailThe value range of (A) is 0.0-5.0 mm.
7. The automatic head and tail pressing control method of the single-stand roughing mill according to claim 1, characterized in that: and in the tail pressing process of the pressure head, the speed of the rolling mill is kept constant, and the AGC thickness control function is not put into use in the process.
8. The automatic head and tail pressing control method of the single-stand roughing mill according to claim 1, characterized in that: the method is used for a single-stand reversible roughing mill for steel rolling or a single-stand reversible roughing mill for nonferrous metal rolling.
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| CN111957751B (en) * | 2020-07-10 | 2022-04-08 | 北京科技大学设计研究院有限公司 | Method for controlling head and tail thinning wedge in reversible rolling process of steckel mill |
| CN112024601B (en) * | 2020-07-27 | 2022-05-20 | 北京科技大学设计研究院有限公司 | Steckel mill strip steel head position tracking method |
| CN112337970A (en) * | 2020-10-22 | 2021-02-09 | 河南中孚高精铝材有限公司 | Double-frame cold rolling mill bottoming thick head control method |
| CN112588835B (en) * | 2020-11-19 | 2022-07-08 | 北京科技大学设计研究院有限公司 | AGC starting time control method for '1 + 3' furnace coil rolling line steckel mill |
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