CN108213371A - A kind of method of the dynamic adjustment red base pressure of slab caster - Google Patents
A kind of method of the dynamic adjustment red base pressure of slab caster Download PDFInfo
- Publication number
- CN108213371A CN108213371A CN201810001423.3A CN201810001423A CN108213371A CN 108213371 A CN108213371 A CN 108213371A CN 201810001423 A CN201810001423 A CN 201810001423A CN 108213371 A CN108213371 A CN 108213371A
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- China
- Prior art keywords
- pressure
- base pressure
- red base
- driven roller
- shaped section
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
- B22D11/207—Controlling or regulating processes or operations for removing cast stock responsive to thickness of solidified shell
Abstract
The invention discloses a kind of methods of dynamic adjustment red base pressure of slab caster, thickness of solidified slab shell in secondary in each fan-shaped section of strand is calculated by solidification and heat transfer second-level model, red base pressure is steadily adjusted according to different thickness of solidified slab shell in secondary dynamics, realizes driving force adaptive smooth transition under different pouring conditions.It can be adaptive the red base pressure value of setting；It opens the stage of pouring and realizes that cold base is converted to hot base pressure automatically, the technological fluctuation stage automatically updates red base pressure set points according to process of setting, and sets red base pressure change threshold value and can avoid pressure frequent fluctuation.This invention ensures that the adaptive steady adjusting of each red base pressure of driven roller, reduces driving force deficiency and causes stagnant base risk, equipment damage, slab quality defect caused by reduction pressure is excessive.
Description
Technical field
The present invention relates to a kind of methods for adjusting the red base pressure of slab caster more particularly to a kind of dynamic adjustment slab to connect
The method of the red base pressure of casting machine, belongs to continuous casting manufacturing technique technical field.
Background technology
Most domestic plank raw materials for production are all produced by slab caster at present, slab caster metallurgical length compared with
It is long, in most of conticaster normal process production processes, after solidification end is located at aligning area.Slab comes out from crystallizer, is fanning
The slab with certain thickness green shell is oriented to by driven roller offer driving force edge and pulls out, therefore the pressure of driven roller is set in shape section
It puts and conclusive effect is played for driving force.
Fan-shaped sections of slab continuous driven roller transmission torque is larger, and different degrees of bulge power is resisted in transmission process
The reaction force generated with strand aligning.Therefore it is also different in the different fan-shaped fragment position power to be overcome, therefore produce
Generally apply different red base pressure values to the fan shaped section driving roller of different zones in the process, on the one hand ensure driven roller to strand
Conveying provides enough driving forces, on the other hand ensures that pressure will not cause band wick-containing strand to generate middle crack, while to prevent
Only pressure is excessive bigger than normal to machine utilization causes the consequences such as driven roller locking or bearing failure.
Traditional red base pressure control strategy is that continuous casting machine fan-shaped segment is integrally divided into 3-4 section, according to normal process
Under the conditions of metallurgical length, set in each section and different values be set respectively, in casting cycle this value maintain it is constant,
Therefore open pour, draws tail base, change pulling rate（Mouth of a river etc. is changed in bleed-out early warning）In the process, it is often stagnant caused by generation driving force deficiency
Base accident, but set red base pressure value it is bigger than normal and bearing life is caused to decline, strand middle crack the problems such as.
Invention content
The technical problem to be solved in the present invention is to provide a kind of methods of dynamic adjustment red base pressure of slab caster.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of method of the dynamic adjustment red base pressure of slab caster, includes the following steps：
Step 1：Set conticaster cast thickness W and fan-shaped section number；Current fan-shaped section is set as 1；
Step 2：The shell thickness d of each fan-shaped section entrance is calculated using solidification and heat transfer model；
Step 3：Set the minimum red base pressure P of point driven roller of each fan-shaped sectionminAnd the red base pressure P of highestmax；The red base pressure of highest
Power PmaxLess than hydraulic station system pressure；
Step 4：Set the red base pressure change threshold value P for dividing driven roller of fan-shaped sectionc；
Step 5：Set the red base rate of pressure change P for dividing driven roller of fan-shaped sectionv；
Step 6：Set the initial value P of red base pressure for dividing driven roller of fan-shaped section0For Pmin；
Step 7：Whether whether judgement present mode located to judge present mode in casting pattern or tail mold formula；If it turns to
Step 9；Otherwise, step 8 is turned to；
Step 8：Cold base pressure set points are hydraulic station system pressure, and it is pending to pass to driven roller pressure set points P, turn to step
Rapid 17；
Step 9：Judge whether pouring length is more than current fan-shaped section end roller：If so, turn to step 11；Otherwise, step is turned to
10；
Step 10：Cold base pressure set points are hydraulic station system pressure, and it is pending to pass to driven roller pressure set points P, are turned to
Step 17；
Step 11：The red base pressure of current fan-shaped section point driven roller is updated to entrance shell thickness d/W/2*PmaxWith PminIt is larger
Value；
Step 12：Judge whether to meet | P1-P0|>P；If so, turn to step 13；Otherwise, step 16 is turned to；
Step 13：Current fan-shaped section divides the red base assigned pressure of driven roller to give waiting red base pressure Pm；；
Step 14：Judge whether to meet | Pm-P0|≤0.1Mpa；If so, turn to step 15；Otherwise, step 16 is turned to；
Step 15：Update P0=P0 Pm； Pm-P0>It is ﹢, P during 0.1Mpam-P0It is ﹣ during ＜ 0.1Mpa；
Step 16：The red base pressure of current fan-shaped section point driven roller is set as P0, and be transferred to driven roller pressure set points P and wait to hold
Row；
Step 17：PLC adjusts driven roller cylinder pressure value by PID, the driven roller actual pressure for feeding back pressure sensor
Value is with setup pressure value P in ± 0.05Mpa.
The red base pressure change threshold value Pc of driven roller set is 0.3-0.8Mpa；The red base pressure change speed of driven roller of setting
Degree Pv is 0.5-1.5Mpa/min.
Conticaster is needed to be equipped with solidification and heat transfer model, such as slighter compress or dynamic water allocation mould containing heat transfer model in the step 2
The system of block；The step 10 need to be equipped with encoder or the long equipment tracking strand base head of other meters.
The red base pressure set points P of each fan-shaped section0It is performed to be sent under hot base pressure control model to PLC control system
Pressure.
Using having technical effect that acquired by above-mentioned technical proposal：It is red to provide a kind of online dynamic adjustment slab caster
The method of base pressure, this method calculates thickness of solidified slab shell in secondary in each fan-shaped section of strand by solidification and heat transfer second-level model, according to not
Same thickness of solidified slab shell in secondary dynamic steadily adjusts red base pressure, realizes driving force adaptive smooth transition under different pouring conditions.
Description of the drawings
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is the flow chart of the present invention couple.
Specific embodiment
Embodiment 1：
A kind of method of the dynamic adjustment red base pressure of slab caster, includes the following steps：
Step 1：Set conticaster cast thickness W and fan-shaped section number；Current fan-shaped section is set as 1；
Step 2：The shell thickness d of each fan-shaped section entrance is calculated using solidification and heat transfer model；
Step 3：Set the minimum red base pressure P of point driven roller of each fan-shaped sectionminAnd the red base pressure P of highestmax；The red base pressure of highest
Power PmaxLess than hydraulic station system pressure；
Step 4：Set the red base pressure change threshold value P for dividing driven roller of fan-shaped sectionc；
Step 5：Set the red base rate of pressure change P for dividing driven roller of fan-shaped sectionv；
Step 6：Set the initial value P of red base pressure for dividing driven roller of fan-shaped section0For Pmin；
Step 7：Whether whether judgement present mode located to judge present mode in casting pattern or tail mold formula；If it turns to
Step 9；Otherwise, step 8 is turned to；
Step 8：Fan shaped section driving roller pressure is cold base pressure control mode, and cold base pressure set points pass to driving roller pressure and set
Definite value P is pending, turns to step 17；Cold base pressure set points are generally hydraulic station system pressure；
Step 9：Judge whether pouring length is more than current fan-shaped section end roller：If so, turn to step 11；Otherwise, step is turned to
10；
Step 10：Fan shaped section driving roller pressure is cold base pressure control mode, and cold base pressure set points pass to driving roller pressure
Setting value P is pending, turns to step 17；Cold base pressure set points are generally hydraulic station system pressure；
Step 11：The red base pressure of current fan-shaped section point driven roller is updated to P1=max (entrance shell thickness d/W/2*Pmax,
Pmin)；I.e.（Entrance shell thickness d/W/2*Pmax）With PminHigher value；
Step 12：Judge whether to meet | P1-P0|>P；If so, turn to step 13；Otherwise, step 16 is turned to；
Step 13：Current fan-shaped section divides the red base assigned pressure of driven roller to give waiting red base pressure Pm；
Step 14：Judge whether to meet | Pm-P0|≤0.1Mpa；If so, turn to step 15；Otherwise, step 16 is turned to；
Step 15：Update P0=P0 Pm； Pm-P0>It is ﹢, P during 0.1Mpam-P0It is ﹣ during ＜ 0.1Mpa；
Step 16：The red base pressure of current fan-shaped section point driven roller is set as P0, and be transferred to driven roller pressure set points P and wait to hold
Row；
Step 17：PLC adjusts driven roller cylinder pressure value by PID, the driven roller actual pressure for feeding back pressure sensor
Value is with setup pressure value P in ± 0.05Mpa；
The red base pressure change threshold value Pc of driven roller set is 0.3-0.8Mpa；The red base rate of pressure change Pv of driven roller of setting
For 0.5-1.5Mpa/min.
Conticaster is needed to be equipped with solidification and heat transfer model, such as slighter compress or dynamic water allocation mould containing heat transfer model in the step 2
The system of block；The step 10 need to be equipped with encoder or the long equipment tracking strand base head of other meters.
The red base pressure set points P of each fan-shaped section0It is performed to be sent under hot base pressure control model to PLC control system
Pressure.
Slab caster section thickness 260mm in the present embodiment, comprising 12 fan-shaped sections, target pull rate is in 0.8 m/min
- 0.9m/min, is equipped with dynamic soft-reduction model, and conticaster calculates throwing length by encoder.Set the minimum red base of driven roller
Pressure Pmin is 3Mpa and the red base pressure Pmax of highest is 10Mpa；The red base pressure change threshold value Pc of driven roller is set as 0.5Mpa；
The red base rate of pressure change Pv of driven roller is set as 1Mpa/min；It is a certain for pouring into a mould Q345D steel grade pulling rates 0.85m/min
The shell thickness and corresponding hot base pressure setting value that moment heat transfer model calculates are as shown in table 1.By taking 6 sections of change procedures as an example,
After base head is more than 6 sections of last rollers, hot base pressure P0 is initialized as 3Mpa, if shell thickness is above-mentioned 113.7mm, then hot base pressure
Power is adjusted with the rate uniform of 1Mpa/min to 8.5 ± 0.1Mpa, ensures the smooth transition of hot base pressure；If when 6 sections of green shells
When thickness change is 115mm, the hot base pressure updated value P1 being calculated is 8.8Mpa, but P1 is less than change threshold with P0 gaps
Pc is 0.5Mpa, therefore is not adjusted, and this avoid pressure caused by slight technological fluctuation frequently to change.It is obtained above to set
Determine hot base pressure P0 and be transferred to driven roller setting pressure P, hydraulic cylinder makes actual pressure and sensor feedback value according to PID adjustings
In ± 0.05Mpa.
This invention ensures that adaptive steady adjusting of the hot base pressure according to technique change, hot base pressure variation is uniform,
Ensure enough driving forces under each process conditions, avoid the stagnant base accident caused by hot base pressure driving force deficiency less than normal,
Reduce that hot base pressure is excessive to cause strand internal flaw and risk of equipment damage.
Table 1：
Claims (2)
- A kind of 1. method of the dynamic adjustment red base pressure of slab caster, it is characterised in that：Include the following steps：Step 1：Set conticaster cast thickness W and fan-shaped section number；Current fan-shaped section is set as 1；Step 2：The shell thickness d of each fan-shaped section entrance is calculated using solidification and heat transfer model；Step 3：Set the minimum red base pressure P of point driven roller of each fan-shaped sectionminAnd the red base pressure P of highestmax；The red base pressure of highest Power PmaxLess than hydraulic station system pressure；Step 4：Set the red base pressure change threshold value P for dividing driven roller of fan-shaped sectionc；Step 5：Set the red base rate of pressure change P for dividing driven roller of fan-shaped sectionv；Step 6：Set the initial value P of red base pressure for dividing driven roller of fan-shaped section0For Pmin；Step 7：Whether whether judgement present mode located to judge present mode in casting pattern or tail mold formula；If it turns to Step 9；Otherwise, step 8 is turned to；Step 8：Cold base pressure set points are hydraulic station system pressure, and it is pending to pass to driven roller pressure set points P, turn to step Rapid 17；Step 9：Judge whether pouring length is more than current fan-shaped section end roller：If so, turn to step 11；Otherwise, step is turned to 10；Step 10：Cold base pressure set points are hydraulic station system pressure, and it is pending to pass to driven roller pressure set points P, are turned to Step 17；Step 11：The red base pressure of current fan-shaped section point driven roller is updated to entrance shell thickness d/W/2*PmaxWith PminIt is larger Value；Step 12：Judge whether to meet | P1-P0|>P；If so, turn to step 13；Otherwise, step 16 is turned to；Step 13：Current fan-shaped section divides the red base assigned pressure of driven roller to give waiting red base pressure Pm；；Step 14：Judge whether to meet | Pm-P0|≤0.1Mpa；If so, turn to step 15；Otherwise, step 16 is turned to；Step 15：Update P0=P0 Pm； Pm-P0>It is ﹢, P during 0.1Mpam-P0It is ﹣ during ＜ 0.1Mpa；Step 16：The red base pressure of current fan-shaped section point driven roller is set as P0, and be transferred to driven roller pressure set points P and wait to hold Row；Step 17：PLC adjusts driven roller cylinder pressure value by PID, the driven roller actual pressure for feeding back pressure sensor Value is with setup pressure value P in ± 0.05Mpa.
- 2. the method for the dynamic adjustment red base pressure of slab caster according to claim 1, it is characterised in that：The drive of setting The red base pressure change threshold value Pc of dynamic roller is 0.3-0.8Mpa；The red base rate of pressure change Pv of driven roller set is 0.5- 1.5Mpa/min。
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| CN201810001423.3A CN108213371B (en) | 2018-01-02 | 2018-01-02 | A kind of method of the dynamic adjustment red base pressure of slab caster |
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| CN201810001423.3A CN108213371B (en) | 2018-01-02 | 2018-01-02 | A kind of method of the dynamic adjustment red base pressure of slab caster |
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| CN108213371B CN108213371B (en) | 2019-10-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110434305A (en) * | 2019-08-30 | 2019-11-12 | 中国重型机械研究院股份公司 | A kind of system and method controlling the driven loads dynamic equilibrium of sheet billet continuous casting host area |
| CN111185584A (en) * | 2020-02-27 | 2020-05-22 | 北京首钢股份有限公司 | Method and system for controlling casting blank of slab casting machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110434305A (en) * | 2019-08-30 | 2019-11-12 | 中国重型机械研究院股份公司 | A kind of system and method controlling the driven loads dynamic equilibrium of sheet billet continuous casting host area |
| CN111185584A (en) * | 2020-02-27 | 2020-05-22 | 北京首钢股份有限公司 | Method and system for controlling casting blank of slab casting machine |
| CN111185584B (en) * | 2020-02-27 | 2021-10-01 | 北京首钢股份有限公司 | Method and system for controlling casting blank of slab casting machine |
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|---|---|
| CN108213371B (en) | 2019-10-29 |
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