CN102294365A - Method for improving calculation accuracy of rolling force - Google Patents
Method for improving calculation accuracy of rolling force Download PDFInfo
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- CN102294365A CN102294365A CN2010102092476A CN201010209247A CN102294365A CN 102294365 A CN102294365 A CN 102294365A CN 2010102092476 A CN2010102092476 A CN 2010102092476A CN 201010209247 A CN201010209247 A CN 201010209247A CN 102294365 A CN102294365 A CN 102294365A
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Abstract
The invention provides a method for improving the calculation accuracy of rolling force. The method comprises the following steps of: weighing a lower roll system and a connecting rod by using an upward pressuring hydraulic cylinder; drawing a compensating curve of the bending force of a working roll and an intermediate roll according to measured bending force and rolling force; and adding force applied to a steel plate by the working roll or intermediate roll with a compensating coefficient during the cylinder bending action into calculation of rolling force. According to the method, the calculation result of the rolling force is more accurate, the measurement, calculation and control accuracies of the rolling force are remarkably increased, and a technical basis is laid for the application of at least 60 tons of rolling force. In particular, the production of strip steel with excessive low hardness such as IF steel and the like is ensured, the yield strength loss of the steel plate can be lowered, strip steel with high deep punching and deep pressing performance is provided for users, and the market competitiveness of enterprises and products is improved.
Description
Technical field
The invention belongs to the steel rolling process field, relate in particular to a kind of method that is used to improve cold rolling six burnishing-in complete machine roll-forces calculating and control accuracy.
Background technology
At present, domestic cold rolled continuous annealing production line adopts six burnishing-in complete machines to carry out polishing mostly, six burnishing-in complete machines systems by frame, up and down backing roll, intermediate calender rolls and upper working rolls and lower working rolls are formed up and down, its kind of drive employing underdrive, kinematic link is located at lower support roller one side.Below the bearing housing of lower support roller both sides, respectively have one press hydraulic cylinder be responsible for roll gap closure and open.After the complete closure of each roll gap, the power that hydraulic cylinder continues upwards to apply will act on the band steel between the upper working rolls and lower working rolls and form roll-force.Therefore so-called roll-force is the pressure that upper and lower working roll imposes on the band steel.Each piston side and cylinder bar side that presses hydraulic cylinder all is equipped with pressure sensor, detects the hydraulic cylinder pressure at two ends up and down, simultaneously the observed pressure value is flowed to the calculating that polishing machine programmable logic controller (being called for short PLC) is used for roll-force.
Be provided with 4 hydraulic cylinders in upper and lower workroll bearing case and intermediate calender rolls bearing housing inboard separately, can apply just curved power to the intermediate calender rolls both sides in the closed fully back of roll gap, the shape that changes intermediate calender rolls is beneficial to control band steel plate type.All have pressure sensor to detect on the piston side of 4 hydraulic cylinders and the cylinder bar lateral line, the observed pressure value is given the calculating that PLC is used for the intermediate calender rolls bending roller force.
Also be provided with 4 hydraulic cylinders in upper and lower workroll bearing case inboard, can apply positive and negative bending roller force to the working roll both sides in the closed fully back of roll gap, the shape that changes working roll is beneficial to control band steel plate type.All there is pressure sensor to detect on piston side and the cylinder bar lateral line, and gives the calculating that PLC is used for work roll bending power the observed pressure value.
The roller hydraulic cylinder is the further direction of smooth band steel of bearing housing positive roller; Otherwise the direction that pushes away the band steel is negative roller.Positive roller presses hydraulic cylinder with minimizing and makes progress to the pressure of steel plate.
At present, the roll-force computing formula that generally adopts is:
Roll-force=fore side pressure * piston area-bar lateral pressure * bar lateral area-cylinder bar weight+transmission side pressure * piston area-bar lateral pressure * bar lateral area-cylinder bar weight-lower support roller weight-following intermediate calender rolls weight-bottom working roll weight-top working roll weight-kinematic link weight.The polishing machine adopts to be measured roll indirectly in the mode that presses hydraulic cylinder bottom setting pressure sensor and is applied to roll-force on the steel plate.This method simple installation is convenient to safeguard.But it is lower support roller, following intermediate calender rolls and the weight of bottom working roll and the weight of motor and connecting rod that measurement result need be removed steel plate lower rollers system.Because these all are field replaceable units, and weight is bigger, weight mostly is estimated value in addition, all replaces with constant in the roll-force calculating formula, certain deviation occurs thereby cause roll-force to calculate.In addition, in the operation of rolling, roller system applied force also is accumulated in the measurement of rolling force system, and the characteristics of polishing machine are big bending roller force, little roll-force, the roller system can provide the power of 196KN, rolling force measurement is caused very big influence, and therefore must carry out adequate compensation could eliminate this influence.
The roll-force of cold rolling levelling machine employing both at home and abroad is all in 80～600 tons of scopes, 80 tons is the minimum roll-force that guarantees that safety is smooth, after roll-force is less than 80 tons, can occur that steel plate skids with roll, roll can not contact fully with the band steel even fault such as broken belt.Owing to be subjected to the restriction of this minimum roll-force, thereby bring certain difficulty for band steel elongation control, cause being with the actual percentage elongation of steel greater than setting value, and be difficult to the percentage elongation index that reaches predetermined.For rank steel plates such as deep-draw, extra-deep drawing steels, low more roll-force can obtain lower percentage elongation and set, and can reduce the loss of steel plate yield strength, for product provides stronger deep-draw ability.This just requires planisher that littler minimum roll-force is arranged.Roll-force computational methods before using will produce certain roll-force deviation, and this has just limited the reduction of smooth minimum roll-force.
Summary of the invention
Purpose of the present invention is exactly at above-mentioned defective, provides a kind of simple, is convenient to operation, improves measurement of rolling force and computational accuracy conscientiously, realizes using the control method of 60 tons of minimum roll-forces.
For reaching this purpose, the present invention has adopted following technical solution:
A kind of method that improves the roll-force computational accuracy, its concrete steps and method are:
1, roller system and kinematic link meter are heavy:
Carry out the time of roll gap Zero positioning behind the each replacing of the utilization roll, two below the startup lower support roller bearing case press hydraulic cylinder, press hydraulic cylinder and hold up lower support roller, following intermediate calender rolls, bottom working roll, when bottom working roll does not touch steel plate as yet, stop, and the holding position is constant; By being located at the pressure sensor that presses on the hydraulic cylinder, will surveying lower roll system and connecting rod weight and flow to milling train PLC record, and adopt assembly average as calculating roller system and connecting rod weight.
2, bending roller force compensation measuring and calculating:
Lifting presses hydraulic cylinder, stablizes the roll gap position behind upper and lower working roll pressing roll gap; Utilize hydraulic cylinder between the upper and lower workroll bearing case and upper and lower working roll and the hydraulic cylinder between the intermediate calender rolls bearing housing separately then, set up and the change bending roller force, by being installed in pressure sensor and the rolling PLC on each hydraulic cylinder, parted hair is measured and is write down different bending roller forces and pairing roll-force, sets up the relation between bending roller force and the roll-force; After repeatedly measuring, form roller compensated curve figure, and be applied in the bending roller force penalty coefficient.
3, roll-force is calculated:
The roll-force computing formula is:
Roll-force=fore side pressure * piston area-bar lateral pressure * bar lateral area-cylinder bar weight+transmission side pressure * piston area-bar lateral pressure * bar lateral area-cylinder bar weight-calculating roller system and connecting rod weight-top working roll weight-work roll bending cylinder are made power-middle roll bending cylinder that the time spent applies steel plate and are made the power that the time spent applies steel plate.
In the formula: work roll bending cylinder is made bending roller force * work roll bending penalty coefficient that power=working roll that the time spent applies steel plate is measured;
Middle roll bending cylinder is made bending roller force * intermediate calender rolls roller penalty coefficient that power=intermediate calender rolls that the time spent applies steel plate is measured.
The roller penalty coefficient of intermediate calender rolls and working roll is under the different roll-force conditions:
| Roll-force (ton) | The work roll bending penalty coefficient | Intermediate calender rolls roll bending roller penalty coefficient |
| 0 | 1 | 1 |
| 100 | 1 | 0.7 |
| 200 | 0.7 | 0.25 |
| 300 | 0.35 | 0.17 |
| 400 | 0.16 | 0.14 |
| 500 | 0.1 | 0.12 |
| 600 | 0.02 | 0.11 |
| 700 | 0 | 0.1 |
| 800 | 0 | 0.09 |
Beneficial effect of the present invention is:
Because the present invention adopts actual measurement roller system and kinematic link weight, and the metering method of averaging, therefore make roller system and kinematic link weight more near actual; Different characteristics according to working roll and intermediate calender rolls, bending roller force is carried out statistical analysis, form roller compensated curve figure, the bending roller force that the bending roller force and the intermediate calender rolls of different roll-force condition bottom working rolls measurements are measured carries out corresponding compensation respectively, and include the roll-force computing formula in, make roll-force result of calculation more accurate, can significantly improve measurement of rolling force, calculating and control accuracy, use for minimum 60 tons of roll-forces and established technical foundation.Especially the production for hardness dead-soft band steel such as IF (extra-deep drawing) steel provides assurance, and need not to eliminate the yield point elongation of band steel, can reduce the loss of steel plate yield strength, thereby have the band steel that performance is pressed in good deep-draw deeply, and improve the enterprise and the competitiveness of product in market for the user provides.
Description of drawings
Accompanying drawing is six roller planisher roll system structure schematic diagrames.
Among the figure: upper support roller 1, go up intermediate calender rolls 2, top working roll 3, go up in the middle of roll bending cylinder 4, top working roll bearing housing 5, band steel 6, work roll bending cylinder 7, bottom working roll bearing housing 8, bottom working roll 9, down in the middle of roll bending cylinder 10, intermediate calender rolls bearing housing 11, kinematic link 12, lower support roller bearing case 13, transmission side press hydraulic cylinder 14, lower support roller 15 down, intermediate calender rolls 16, fore side press hydraulic cylinder 17 down.
The specific embodiment
Accompanying drawing is six roller planisher roll system structure schematic diagrames, and by accompanying drawing as seen, six roller planisher rollers system is made up of upper support roller 1, last intermediate calender rolls 2, top working roll 3, bottom working roll 9, following intermediate calender rolls 16 and lower support roller 15.Adopt underdrive, kinematic link 12 is located at the right side of lower support roller bearing case 13.Be respectively equipped with below both sides lower support roller bearing case 13 that a transmission side presses hydraulic cylinder 14 and fore side presses hydraulic cylinder 17, its effect is to be responsible for the folding of roll gap and to press being with steel 6 to carry out skin pass rolling.
Roll bending cylinder 4 in the middle of being provided with on 4 between top working roll bearing housing 3 and last intermediate calender rolls bearing housing applies just curved power in the closed fully back of roll gap to the intermediate calender rolls both sides.Between top working roll bearing housing 3 and bottom working roll bearing housing 8, also be provided with 4 work roll bending cylinders 7, can apply positive and negative bending roller force to the working roll both sides in the closed fully back of roll gap.Equally, also be provided with 4 down middle roll bending cylinders 10 between bottom working roll bearing housing 8 and following intermediate calender rolls bearing housing 11, in the closed fully back of roll gap the intermediate calender rolls both sides applied just curved power, the shape of change intermediate calender rolls is beneficial to control band steel plate type.In addition, on the piston side of all hydraulic cylinder and curved cylinder and cylinder bar lateral line, all be provided with pressure sensor, be responsible for the pressure detecting at these hydraulic cylinder two ends, and give the calculating that PLC is used for work roll bending power the observed pressure value.
The concrete steps that the present invention improves the method for roll-force computational accuracy are:
1, carrying out roller system and kinematic link meter weighs:
According to technological requirement, all to carry out the Zero positioning of roll gap behind each replacing roll, the present invention utilizes the time of roll gap Zero positioning just, starting transmission sides below the lower support roller bearing case 13 presses hydraulic cylinder 14 and fore side and presses hydraulic cylinder 17 and promote lower rolls system and move up, press hydraulic cylinder and hold up lower support roller 12 when two, following intermediate calender rolls 16, bottom working roll 9 and bottom working roll 9 do not stop when touching band steel 6, make the roll gap of possessing 10mm between top working roll 3 and the bottom working roll 9, the holding position is constant then, and press hydraulic cylinder 14 and fore side and press pressure sensor on the hydraulic cylinder 17 by being located at transmission side, to survey bottom working roll 9, following intermediate calender rolls 16, the gross weight of lower support roller 15 and kinematic link 12 flows to milling train PLC record, for the weight that makes measurement and metrology more accurate, can repeatedly repeat said process, and adopt assembly average as calculating roller system and connecting rod weight.
2, carry out bending roller force compensation measuring and calculating:
Roller system applied force is inevitable also to be accumulated in the measurement of rolling force system, the characteristics of polishing machine are the little roll-forces of big bending roller force, the roller system can provide the power of 196KN altogether, and this causes very big influence to measurement of rolling force, and must obtain corresponding compensation could the actual roll-force of true reflection.But bending roller force is to act on the bearing housing, and pressing the pressure that hydraulic cylinder 14 and fore side press the reflection of hydraulic cylinder 17 upward pressure sensors with transmission side is non-linear dependence, therefore adopts the method for stablizing the roll gap position behind the pressing roll gap to determine offset.
Promote at first that transmission side presses hydraulic cylinder 14 and fore side presses hydraulic cylinder 17, behind upper and lower working roll pressing roll gap, stablize the roll gap position; Utilize then between the upper and lower workroll bearing case 4 work roll bending cylinders 7 and last in the middle of roll bending cylinders 4, down in the middle of roll bending cylinder 10, change bending roller force, by being installed in pressure sensor and the rolling PLC on each hydraulic cylinder, parted hair is measured and is write down different bending roller forces and pairing roll-force, sets up the relation between bending roller force and the roll-force; After repeatedly measuring, form roller compensated curve figure, and be applied in the bending roller force penalty coefficient.The roller penalty coefficient of intermediate calender rolls and working roll is under the different roll-force conditions:
| Roll-force (ton) | The work roll bending penalty coefficient | Intermediate calender rolls roll bending roller penalty coefficient |
| 0 | 1 | 1 |
| 100 | 1 | 0.7 |
| 200 | 0.7 | 0.25 |
| 300 | 0.35 | 0.17 |
| 400 | 0.16 | 0.14 |
| 500 | 0.1 | 0.12 |
| 600 | 0.02 | 0.11 |
| 700 | 0 | 0.1 |
| 800 | 0 | 0.09 |
3, roll-force is calculated:
After calculating roller system and connecting rod weight and bending roller force penalty coefficient were determined, the power that can be rolled was calculated.
Roll-force=fore side pressure * piston area-bar lateral pressure * bar lateral area-cylinder bar weight+transmission side pressure * piston area-bar lateral pressure * bar lateral area-cylinder bar weight-calculating roller system and connecting rod weight-top working roll weight-work roll bending cylinder are made power-middle roll bending cylinder that the time spent applies steel plate and are made the power that the time spent applies steel plate.
Wherein: work roll bending cylinder is made bending roller force * work roll bending penalty coefficient that power=working roll that the time spent applies steel plate is measured;
Middle roll bending cylinder is made bending roller force * intermediate calender rolls roller penalty coefficient that power=intermediate calender rolls that the time spent applies steel plate is measured.
Detailed calibration process of the present invention and program are:
The 1st step, hydraulic cylinder are withdrawn fully, reset to demarcate to finish signal, 0 signal of hydraulic cylinder that resets, 0 signal of the roll-force that resets.Forbid the roll-force control model.
The 2nd step, 0 signal of setting hydraulic cylinder, setting the hydraulic cylinder extension elongation is 0, system is normal with the checking Position of Hydraulic Cylinder.The roll-force that resets claims roller heavily to finish signal.
The 3rd step, disabled position control model are calculated transmission side and fore side hydraulic cylinder and are reached roll line Theoretical Calibration position.Set to demarcate and finish signal.
The 4th step, the order of startup hydraulic valve enable position control mode, the given 10mm of position setting value (hydraulic cylinder is apart from roll line 10mm), and positioner is gone to desired location by set-point slope work control hydraulic cylinder.
The 5th goes on foot, forbids the roll-force control model.
The 6th step, 0 signal of set roll-force, record fore side and transmission side roll-force actual value will be as side-play amount (roll-force of measuring will deduct this weight later on), and the set roll-force claims roller heavily to finish signal.
The 7th step, positioner intermesh determination 15mm, hydraulic cylinder press the work of set-point slope.
The 8th step, setting are demarcated and are finished signal, and request of demarcating and activation signal reset.
Claims (2)
1. a method that improves the roll-force computational accuracy is characterized in that, concrete steps and method are:
(1), roller system and kinematic link meter are heavy:
Carry out the time of roll gap Zero positioning behind the each replacing of the utilization roll, two below the startup lower support roller bearing case press hydraulic cylinder, hold up the lower support roller, do not stop when intermediate calender rolls, bottom working roll and bottom working roll touch steel plate as yet down when pressing hydraulic cylinder, and the holding position is constant, by being located at the pressure sensor that presses on the hydraulic cylinder, to survey lower roll system and connecting rod weight and flow to milling train PLC record, and adopt assembly average as calculating roller system and connecting rod weight;
(2), bending roller force compensation measuring and calculating:
Lifting presses hydraulic cylinder, stablizes the roll gap position behind upper and lower working roll pressing roll gap; Utilize hydraulic cylinder between the upper and lower workroll bearing case and upper and lower working roll and the hydraulic cylinder between the intermediate calender rolls bearing housing separately then, set up and the change bending roller force, by being installed in pressure sensor and the rolling PLC on each hydraulic cylinder, parted hair is measured and is write down different bending roller forces and pairing roll-force, sets up the relation between bending roller force and the roll-force; After repeatedly measuring, form roller compensated curve figure, and be applied in the bending roller force penalty coefficient;
(3, roll-force calculates:
The roll-force computing formula is:
Roll-force=fore side pressure * piston area-bar lateral pressure * bar lateral area-cylinder bar weight+transmission side pressure * piston area-bar lateral pressure * bar lateral area-cylinder bar weight-calculating roller system and connecting rod weight-top working roll weight-work roll bending cylinder are made power-middle roll bending cylinder that the time spent applies steel plate and are made the power that the time spent applies steel plate;
In the formula: work roll bending cylinder is made bending roller force * work roll bending penalty coefficient that power=working roll that the time spent applies steel plate is measured;
Middle roll bending cylinder is made bending roller force * intermediate calender rolls roller penalty coefficient that power=intermediate calender rolls that the time spent applies steel plate is measured.
2. the method for raising roll-force computational accuracy according to claim 1 is characterized in that, the roller penalty coefficient of intermediate calender rolls and working roll is under the different roll-force conditions:
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| CN2010102092476A CN102294365A (en) | 2010-06-25 | 2010-06-25 | Method for improving calculation accuracy of rolling force |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103917309A (en) * | 2012-06-26 | 2014-07-09 | 新日铁住金株式会社 | Sheet metal rolling device |
| CN105855298A (en) * | 2015-01-23 | 2016-08-17 | 鞍钢股份有限公司 | Method for calculating hot rolling force of high-precision boron-containing steel |
| CN109261724A (en) * | 2018-09-14 | 2019-01-25 | 北京科技大学设计研究院有限公司 | A method of improving preset model precision under multi items rolling mode |
| CN111250551A (en) * | 2020-01-15 | 2020-06-09 | 首钢京唐钢铁联合有限责任公司 | Method and system for controlling bending force of finishing machine |
| TWI711496B (en) * | 2020-01-21 | 2020-12-01 | 中國鋼鐵股份有限公司 | Method for improving setting of temperature control rolling process |
| CN112207139A (en) * | 2020-11-04 | 2021-01-12 | 攀枝花学院 | Method for calculating rolling force of six-roller temper mill |
| CN114570774A (en) * | 2022-03-22 | 2022-06-03 | 首钢智新迁安电磁材料有限公司 | Rolling force calculation method and device of rolling mill |
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| US5412966A (en) * | 1993-07-16 | 1995-05-09 | Worldclass Industries, Inc. | Push-pull pickle line |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103917309A (en) * | 2012-06-26 | 2014-07-09 | 新日铁住金株式会社 | Sheet metal rolling device |
| CN103917309B (en) * | 2012-06-26 | 2016-03-23 | 新日铁住金株式会社 | The rolling device of sheet metal |
| CN105855298A (en) * | 2015-01-23 | 2016-08-17 | 鞍钢股份有限公司 | Method for calculating hot rolling force of high-precision boron-containing steel |
| CN109261724A (en) * | 2018-09-14 | 2019-01-25 | 北京科技大学设计研究院有限公司 | A method of improving preset model precision under multi items rolling mode |
| CN111250551A (en) * | 2020-01-15 | 2020-06-09 | 首钢京唐钢铁联合有限责任公司 | Method and system for controlling bending force of finishing machine |
| CN111250551B (en) * | 2020-01-15 | 2022-03-18 | 首钢京唐钢铁联合有限责任公司 | Method and system for controlling bending force of finishing machine |
| TWI711496B (en) * | 2020-01-21 | 2020-12-01 | 中國鋼鐵股份有限公司 | Method for improving setting of temperature control rolling process |
| CN112207139A (en) * | 2020-11-04 | 2021-01-12 | 攀枝花学院 | Method for calculating rolling force of six-roller temper mill |
| CN114570774A (en) * | 2022-03-22 | 2022-06-03 | 首钢智新迁安电磁材料有限公司 | Rolling force calculation method and device of rolling mill |
| CN114570774B (en) * | 2022-03-22 | 2024-04-12 | 首钢智新迁安电磁材料有限公司 | Rolling force calculation method and device of rolling mill |
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Application publication date: 20111228 |