CN101091965A - Method for controlling load balance of rolling mill for cold rolled steel strip driven by dual electrical motors - Google Patents
Method for controlling load balance of rolling mill for cold rolled steel strip driven by dual electrical motors Download PDFInfo
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- CN101091965A CN101091965A CN 200610046999 CN200610046999A CN101091965A CN 101091965 A CN101091965 A CN 101091965A CN 200610046999 CN200610046999 CN 200610046999 CN 200610046999 A CN200610046999 A CN 200610046999A CN 101091965 A CN101091965 A CN 101091965A
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Abstract
The invention discloses a control method for load balance of cold-strip steel rolling mill of double motor drive. The feature is that it is realized by control the technical parameter of roller, technical parameter of emulsion, dynamically adjusting rolling unit tension, percent of reduction and acceleration of raising speed of driving motor. The invention could compensate the work roller friction by the control parameters of percent of reduction, unit tension and acceleration of driving motor according to the actual parameter of rolling strip steel. The method could improve the stability during rolling process and control the motor speed difference caused by load difference by 3%.
Description
Technical field
The invention belongs to the steel rolling field, be applicable to the production process control of the rolling mill for cold rolled steel strip of Belt Driven by Double Motor, specifically is the control method of load balance of rolling mill for cold rolled steel strip driven by dual electrical motors.
Technical background
In the cold rolling of strip steel production process,, can cause the as-rolled condition difference in the up-down rollers rolling deformation district because the rolling technological parameter of up-down rollers exists difference.Because the as-rolled condition difference of upper working rolls and lower working rolls makes rolling loads such as upper working rolls and lower working rolls roll-force, roll torque there are differences.
Be provided with two motor load balance control functions of up-down rollers transmission in the cold-rolling mill control system for Belt Driven by Double Motor.The purpose of this motor load balance control is for the electric current, the motor torque that guarantee the up-down rollers driving motor unanimity of exerting oneself in rolling process, otherwise the operation of rolling can't be carried out.
The speed of an independent work drive motor is provided with ring and speed control outer shroud in the load control in the control system of each driving motor, so can accurately be controlled.But be controlled in certain scope in order to satisfy the two load difference of driving motor when rolling, the control of the balancing the load of motor is satisfied the consistent requirement of up-down rollers driving motor load by the speed of adjusting motor.
Like this, if there is bigger difference in the up-down rollers rolling load in the operation of rolling, can cause that like this there is big difference in the load of up-down rollers driving motor, the adjustment of the load balancing control system by motor can make the speed difference of up-down rollers motor obviously increase.The increase of up-down rollers motor speed difference makes the speed difference of upper working rolls and lower working rolls increase, when the speed difference of upper working rolls and lower working rolls is increased to certain value, gently then belt steel surface will produce the slide mark defective, heavy then with steel because of the stranding that is subjected to up-down rollers roll the effect broken belt cause production accident.
Because there are the problems referred to above in the cold-rolling mill of Belt Driven by Double Motor, therefore newly-built in recent years cold-rolling mill generally adopts single motor kind of drive.But the cold-rolling mill of Belt Driven by Double Motor still is used for actual production at present in a large number, therefore is necessary to take suitable method to overcome the above-mentioned shortcoming of double motor drive system.
Summary of the invention
At the problem that exists in the existing Belt Driven by Double Motor cold-rolling mill production technology, the present invention proposes a kind of integrated control method, it is the control method of load balance of rolling mill for cold rolled steel strip driven by dual electrical motors, upper working rolls and lower working rolls speed difference in the operation of rolling can be controlled at small range, thereby guarantee the stable of the operation of rolling, avoid producing steel strip surface defect, do not influence normal milling train production process.
Technical scheme of the present invention is such, by determining what roller technology parameter, emulsion process parameter value, acceleration when dynamically adjusting rolling unit tension force, reduction ratio and driving motor raising speed were realized.
Each parameter of the present invention is as follows:
The roller technology parameter comprises that working roll roughness, maximum rolling cycle of roll and working roll are joined the roller technology parameter value of roller diameter difference,
Wherein,
The work roll surface roughness: 0.9 μ m～1.1 μ m,
The maximum rolling cycle: 4200 tons,
It is poor that maximum is joined roller: 4mm.
The emulsion technological parameter is:
Flow＞5000l/min,
Concentration: 3.0～3.5%,
PH value: 5～8,
Electrical conductivity＜120 μ s/cm,
Saponification number＞120mg KOH/g,
E.S.I:40～60%, E.S.I are represented the physical quantity of the stability of emulsion,
Temperature: 55～60 ℃,
Pressure: 8～10Bar,
Upper working rolls and lower working rolls emulsion flow-rate ratio: 0.8～0.85.
Milling train exporting unit tension force controlling value is,
When working roll rolling cycle 0～2000 ton hour, unit tension numerical value is 1.0 σ Mpa;
When working roll rolling cycles 2000～3000 ton hour, unit tension numerical value is 1.15 σ Mpa;
When working roll rolling cycles 3000～4200 ton hour, unit tension numerical value is 1.4 σ Mpa.
Wherein σ is a milling train exporting unit tension force.
Milling train exporting unit tension force controlling value,
When working roll rolling cycle 0～2000 ton hour, reduction ratio numerical value 1.0r%,
When working roll rolling cycles 2000～3000 ton hour, reduction ratio numerical value 0.9r%,
When working roll rolling cycles 3000～4200 ton hour, reduction ratio numerical value 0.7r%,
Wherein r is a reduction ratio.
Motor raising speed Acceleration Control,
Working roll rolling cycle 0～2500 ton hour on duty, acceleration value 1.0m/s
2,
Working roll rolling cycles 2500～4200 ton hour on duty, acceleration value 0.6m/s
2
Above-mentioned parameter of the present invention can adopt wherein two or more or adopt simultaneously, load balance of rolling mill for cold rolled steel strip driven by dual electrical motors is controlled.
The present invention adopts method that computer controlled automatic and measuring technique, friction combine with lubricating status control and cold continuous rolling band steel Dynamic Rolling Process rules technology that the contact with the strip rolling load of deformed area of upper working rolls and lower working rolls in the cold-strip steel operation of rolling is carried out Comprehensive Control, in the hope of roll-force, the roll torque balance in the deformed area up and down, it is poor to reduce rolling load, thereby reduces the upper working rolls and lower working rolls speed difference that up-down rollers driving motor load difference causes.Can improve the stability of the operation of rolling significantly by above-mentioned integrated control method, the motor speed difference that causes owing to upper working rolls and lower working rolls rolling load difference can be controlled in 3%.
Description of drawings
The present invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is a Belt Driven by Double Motor milling train schematic diagram,
Fig. 2 is a driving motor speed measured data in the operation of rolling under embodiment 1 process conditions,
Fig. 3 is a driving motor speed measured data in the operation of rolling under embodiment 2 process conditions,
Fig. 4 is a driving motor speed measured data in the operation of rolling under embodiment 3 process conditions.
The specific embodiment
As shown in Figure 1,2,3 is upper and lower working roll, and 1,4 is upper and lower backing roll, and 5 is steel plate, and 6,7 is the up-down rollers driving motor.
The present invention determines original work roll surface roughness working range by a large amount of industrial experiments: 0.9～1.1 μ m; 4200 tons of maximum rolling cycles of working roll; It is 4mm that upper and lower working roll is joined roller diameter difference maximum.When working roll is joined roller, if upper working rolls and lower working rolls diameter difference during greater than 1mm the major diameter working roll be used for top roll, if the diameter difference during less than 1mm the high roll of surface roughness be used for top roll.Determine emulsion technological parameter (table 1) by a large amount of industrial experiments:
Table 1 emulsion technological parameter
| Parameter name | Numerical value |
| Flow (l/min) | ＞5000 |
| Concentration (%) | 3.0～3.5 |
| |
5～8 |
| Electrical conductivity (μ s/cm) | ＜120 |
| Saponification number (mg KOH/g) | ＞120 |
| E.S.I (%) (physical quantity of the stability of expression emulsion) | 40～60 |
| Temperature (℃) | 55～60 |
| Pressure (Bar) | 8～10 |
In the operation of rolling, by to the control of the opening degree of valve in the emulsion spraying system equipment, the emulsion injection flow that makes top working roll is 0.8～0.85 with the ratio of the emulsion injection flow of bottom working roll.
When the rolled band steel total amount of working roll changes, the acceleration (table 4) when dynamically adjusting milling train exporting unit tension force (table 2), reduction ratio (table 3) and up-down rollers driving motor raising speed according to the rolling total amount of working roll.
Table 2 milling train exporting unit tension force control letter
| The roll rolling cycle (ton) | Unit tension numerical value (Mpa) |
| 0～2000 2000～3000 3000～4200 | 1.0σ 1.15σ 1.4σ |
Table 3 milling train reduction ratio controlling value
| The roll rolling cycle (ton) | Reduction ratio numerical value (%) |
| 0～2000 2000～3000 3000～4200 | 1.0r 0.9r 0.7r |
Table 4 motor raising speed Acceleration Control value
| The roll rolling cycle (ton) | Acceleration value (m/s2) |
| 0～2500 2500～4200 | 1.0 0.6 |
In table 2 and the table 3, tension force σ of milling train exporting unit and reduction ratio r are not fixed values, and they are to be got by calculating according to steel grade, the specification of rolled band steel by control system computer model system.
The present invention proposes on the basis of control system calculated value, unit tension, reduction ratio and motor raising speed acceleration is dynamically revised according to the roll rolling cycle.
Embodiment 1:
The original rugosity just of upper and lower working roll is respectively: 0.91 μ m, 0.95 μ m.The rolled band steel total amount of working roll is 1524 tons during belt steel rolling.Belt steel rolling steel grade st12, inlet thickness 2.19mm, reduction ratio r are 20%, the wide 1250mm of strip.The tension force σ of milling train exporting unit is 120Mpa in the operation of rolling, and motor acceleration is 1m/s in the accelerator
2
Concentration of emulsion used is 3.25%, and temperature is 57 ℃, and pH value is 6.1, and electrical conductivity is 101 μ s/cm, and saponification number is 170mg KOH/g, and E.S.I is 51%, expulsion pressure 9.1Bar, working roll emulsion injection flow 5140l/min.
Under above-mentioned technological parameter condition, the torque of up-down rollers driving motor and speed actual value such as Fig. 2 in the belt steel rolling process.
Embodiment 2:
The original rugosity just of upper and lower working roll is respectively: 0.98 μ m, 0.94 μ m.The rolled band steel total amount of working roll is 2422 tons during belt steel rolling.Belt steel rolling steel grade spcc, inlet thickness 2.17mm, the wide 1220mm of strip.The initial depression rate r of computer settings is 18%, is 0.9 * 18% through revised reduction ratio.The tension force σ of milling train exporting unit of computer initial setting is 125Mpa, and exporting unit's tension force is 1.15 * 125Mpa after revising, and the motor acceleration of initial setting is 1m/s
2, revised acceleration is 0.8m/s
2
Concentration of emulsion used is 3.5%, and temperature is 58 ℃, and pH value is 6.4, and electrical conductivity is 106 μ s/cm, and saponification number is 173mg KOH/g, and E.S.I is 55%, expulsion pressure 9.7Bar, working roll emulsion injection flow 5410l/min.
Under above-mentioned technological parameter condition, the torque of up-down rollers driving motor and speed actual value such as Fig. 3 in the belt steel rolling process.
Embodiment 3:
The original rugosity just of upper and lower working roll: 1.04 μ m, 1.14 μ m.The rolled band steel total amount of working roll is 3104 tons during belt steel rolling.Belt steel rolling steel grade st12, inlet thickness 1.15mm, the wide 1225mm of strip.The initial depression rate r of computer settings is 33%, is 0.7 * 33% through revised reduction ratio.The tension force σ of milling train exporting unit of computer initial setting is 125Mpa, and exporting unit's tension force is 1.4 * 125Mpa after revising, and the motor acceleration of initial setting is 1m/s
2, revised acceleration is 0.6m/s
2
Concentration of emulsion used is 3.5%, and temperature is 59 ℃, and pH value is 7.2, and electrical conductivity is 103 μ s/cm, and saponification number is 170mg KOH/g, and E.S.I is 51%, expulsion pressure 9.3Bar, working roll emulsion injection flow 5141l/min.
Under above-mentioned technological parameter condition, the torque of up-down rollers driving motor and speed actual value such as Fig. 4 in the belt steel rolling process.
In the operations of rolling such as embodiment 1～embodiment 3, the real data of up-down rollers driving motor speed can be found, adopt roller technology parameter of the present invention, emulsion technological parameter and corresponding dynamic rolling procedure, the operation of rolling of band steel is stable, and the speed difference of the motor of up-down rollers all is controlled in 3%.
Claims (7)
1, a kind of control method of cold strip mill working roll balancing the load of Belt Driven by Double Motor is characterized in that: by determining what roller technology parameter, emulsion process parameter value, acceleration when dynamically adjusting rolling unit tension force, reduction ratio and driving motor raising speed were realized.
2, the control method of the cold strip mill working roll balancing the load of a kind of Belt Driven by Double Motor according to claim 1, it is characterized in that, the roller technology parameter comprises that working roll roughness, maximum rolling cycle of roll and working roll are joined the roller technology parameter value of roller diameter difference
Wherein,
The work roll surface roughness: 0.9 μ m～1.1 μ m,
Maximum rolling cycle: 4200T,
It is poor that maximum is joined roller: 4mm.
3, the control method of the cold strip mill working roll balancing the load of a kind of Belt Driven by Double Motor according to claim 1 is characterized in that, the emulsion technological parameter is,
Flow＞5000l/min,
Concentration: 3.0～3.5%,
PH value: 5～8,
Electrical conductivity＜120 μ s/cm,
Saponification number＞120mg KOH/g,
E.S.I:40～60%, E.S.I are represented the physical quantity of the stability of emulsion,
Temperature: 55～60 ℃,
Pressure: 8～10Bar,
Upper working rolls and lower working rolls emulsion flow-rate ratio: 0.8～0.85.
4, the control method of the cold strip mill working roll balancing the load of a kind of Belt Driven by Double Motor according to claim 1 is characterized in that, milling train exporting unit tension force controlling value is,
When working roll rolling cycle 0～2000 ton hour, unit tension numerical value is 1.0 σ Mpa;
When working roll rolling cycles 2000～3000 ton hour, unit tension numerical value is 1.15 σ Mpa;
When working roll rolling cycles 3000～4200 ton hour, unit tension numerical value is 1.4 σ Mpa.
σ initial setting unit tension wherein.
5, the control method of the cold strip mill working roll balancing the load of a kind of Belt Driven by Double Motor according to claim 1 is characterized in that,
When working roll rolling cycle 0～2000 ton hour, reduction ratio numerical value 1.0r%,
When working roll rolling cycles 2000～3000 ton hour, reduction ratio numerical value 0.9r%,
When working roll rolling cycles 3000～4200 ton hour, reduction ratio numerical value 0.7r%,
Wherein r is the rolling reduction ratio of initial setting.
6, the control method of the cold strip mill working roll balancing the load of a kind of Belt Driven by Double Motor according to claim 1 is characterized in that, motor raising speed Acceleration Control,
Working roll rolling cycle 0～2500 ton hour on duty, acceleration value 1.0m/s
2,
Working roll rolling cycles 2500～4200 ton hour on duty, acceleration value 0.6m/s
2
7, according to the control method of the cold strip mill working roll balancing the load of the described a kind of Belt Driven by Double Motor of claim 2～6, it is characterized in that, adopt in the above-mentioned parameter two or more or adopt simultaneously and control.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101658872B (en) * | 2008-08-29 | 2011-12-07 | 株式会社日立制作所 | Hot-rolled tension control device and tension control method |
| CN102296169A (en) * | 2010-06-25 | 2011-12-28 | 上海宝钢工业检测公司 | Early warning method for pocking marks on surface of strip steel of annealing set |
| WO2012068828A1 (en) * | 2010-11-26 | 2012-05-31 | 宝山钢铁股份有限公司 | Cold rolling method for preventing high silicon strip steel from breaking |
| CN101934288B (en) * | 2009-06-30 | 2014-08-27 | 上海宝信软件股份有限公司 | Cold continuous rolling reduction distribution method |
| CN104550236A (en) * | 2015-01-07 | 2015-04-29 | 王乐 | Cold rolling process capable of preventing broken edge wave defect of ultrathin steel strip |
| CN109261728A (en) * | 2018-09-29 | 2019-01-25 | 安阳合力创科冶金新技术股份有限公司 | A kind of cold-pilgered bar milling train is double to drive synchronisation control means |
| CN110129545A (en) * | 2019-04-28 | 2019-08-16 | 首钢智新迁安电磁材料有限公司 | A kind of method and apparatus improving annealing furnace tension force stability |
| CN110369517A (en) * | 2019-07-31 | 2019-10-25 | 日照宝华新材料有限公司 | A method of there is scratch in control jockey pulley skidding |
| CN111438186A (en) * | 2020-03-31 | 2020-07-24 | 首钢京唐钢铁联合有限责任公司 | Preparation method of five-tandem mill strip steel |
| CN113295491A (en) * | 2021-05-24 | 2021-08-24 | 河海大学 | Metallographic preparation device for material science and engineering |
| CN114210730A (en) * | 2022-02-21 | 2022-03-22 | 山西太钢不锈钢精密带钢有限公司 | Production method for improving rolling efficiency of stainless steel precision strip steel |
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2006
- 2006-06-19 CN CNB2006100469999A patent/CN100551567C/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101658872B (en) * | 2008-08-29 | 2011-12-07 | 株式会社日立制作所 | Hot-rolled tension control device and tension control method |
| CN101934288B (en) * | 2009-06-30 | 2014-08-27 | 上海宝信软件股份有限公司 | Cold continuous rolling reduction distribution method |
| CN102296169B (en) * | 2010-06-25 | 2015-06-17 | 上海宝钢工业技术服务有限公司 | Early warning method for pocking marks on surface of strip steel of annealing set |
| CN102296169A (en) * | 2010-06-25 | 2011-12-28 | 上海宝钢工业检测公司 | Early warning method for pocking marks on surface of strip steel of annealing set |
| WO2012068828A1 (en) * | 2010-11-26 | 2012-05-31 | 宝山钢铁股份有限公司 | Cold rolling method for preventing high silicon strip steel from breaking |
| US9056343B2 (en) | 2010-11-26 | 2015-06-16 | Baoshan Iron & Steel Co., Ltd. | Cold-rolling method for preventing fracture of high-silicon strip steel |
| CN104550236A (en) * | 2015-01-07 | 2015-04-29 | 王乐 | Cold rolling process capable of preventing broken edge wave defect of ultrathin steel strip |
| CN109261728A (en) * | 2018-09-29 | 2019-01-25 | 安阳合力创科冶金新技术股份有限公司 | A kind of cold-pilgered bar milling train is double to drive synchronisation control means |
| CN110129545A (en) * | 2019-04-28 | 2019-08-16 | 首钢智新迁安电磁材料有限公司 | A kind of method and apparatus improving annealing furnace tension force stability |
| CN110369517A (en) * | 2019-07-31 | 2019-10-25 | 日照宝华新材料有限公司 | A method of there is scratch in control jockey pulley skidding |
| CN111438186A (en) * | 2020-03-31 | 2020-07-24 | 首钢京唐钢铁联合有限责任公司 | Preparation method of five-tandem mill strip steel |
| CN111438186B (en) * | 2020-03-31 | 2022-01-18 | 首钢京唐钢铁联合有限责任公司 | Preparation method of five-tandem mill strip steel |
| CN113295491A (en) * | 2021-05-24 | 2021-08-24 | 河海大学 | Metallographic preparation device for material science and engineering |
| CN114210730A (en) * | 2022-02-21 | 2022-03-22 | 山西太钢不锈钢精密带钢有限公司 | Production method for improving rolling efficiency of stainless steel precision strip steel |
| CN114210730B (en) * | 2022-02-21 | 2022-04-26 | 山西太钢不锈钢精密带钢有限公司 | Production method for improving rolling efficiency of stainless steel precision strip steel |
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