CN101554650A - Method for controlling online calibration of pulling-straightening roller gap under light pressure of bloom caster - Google Patents
Method for controlling online calibration of pulling-straightening roller gap under light pressure of bloom caster Download PDFInfo
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- CN101554650A CN101554650A CNA2009100116793A CN200910011679A CN101554650A CN 101554650 A CN101554650 A CN 101554650A CN A2009100116793 A CNA2009100116793 A CN A2009100116793A CN 200910011679 A CN200910011679 A CN 200910011679A CN 101554650 A CN101554650 A CN 101554650A
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Abstract
A method for controlling the online calibration of a pulling-straightening roller gap under the light pressure of a bloom caster belongs to the process field of the bloom caster under the light pressure in steel production. The method comprises the following steps of: (1) determining the object pulling rate v0 of the online calibration roll gap; (2) recording the roll gap value and the number of instantaneous roll gaps; (3) calculating the average value Si of each roll gap and the difference Di between the average value Si and the average S1 of a No. 1 roll gap; (4) calibrating the roll gap and implementation calibration on each pulling-straightening roller according to the roll gap Di from step (3), with the roll gap value of a pulling-straightening roller equal to the roll gap value of No. 1 roller plus Di. The online roll gap calibration method can calibrate the roll gap when in pouring for each time, can ensure the accurate implementation of the proposal under presupposition pressure, thereby obviously reducing the center segregation of a casting slab, reducing or even eliminating the occurrence of center shrinkage and center porosity.
Description
Technical field
The bloom continuous casting that the invention belongs in the iron and steel production is gently depressed technology field, particularly relates to a kind of control method of pulling-straightening roller gap under light pressure of bloom caster on-line proving.
Background technology
The strand cross dimension is greater than the large square bland continuous-casting machine of 220mm * 220mm mainly cast high-quality steel and steel alloy, in order to rolling high-strength degree shaped steel, wire rod, channel-section steel, angle steel, round steel and seamless steel pipe etc. to internal soundness and the strict steel grade of compression ratio.Because the large square bland continuous-casting machine casting blank cross-section size is big, thereby the casting blank solidification time is longer, strand produce center segregation, center porosity, etc. the tendentiousness of central defect bigger.Center segregation is formed in the casting process with loose the earliest, and in the heating in later stage, the operation of rolling, be difficult to effective elimination, mechanical performance of products and decay resistance are produced injurious effects, therefore how effectively to prevent from and alleviate element segregation in process of setting to produce high-quality most important with the high added value steel grade for the hot-working character of the energy loss that reduces subsequent handling, raising product.So how to eliminate center segregation from the source is the important content that the researcher and the producer pay close attention to loosening always.It is exactly wherein effective means that continuous casting billet is gently depressed technology, and it produces the solidification shrinkage amount that certain drafts compensates strand by exerting pressure near the liquid core of continuous casting billet end, reaches to eliminate center segregation and loose purpose.
Think through big quantity research and practice: only choosing suitable drafts could full remuneration solidify the volume shrinkage mass of terminal point molten steel in process of setting, just can prevent flowing of enrichment solute molten steel, reach the purpose of eliminating central pipe, center segregation and center porosity.And can the setting scheme of drafts accurately implement to follow the accuracy of straightening roller (being depress roller) demarcation directly related.In the actual production that bloom is gently depressed, adopt now the off-line roll gap calibration usually, because the periodicity of off-line calibration, make and depress gently that being implemented in of scheme demarcated early stage and the later stage changes to some extent, bloom quality instability after causing implementing gently to depress; Off-line calibration reduces the operating rate of conticaster simultaneously.
Invention aspect disclosed relevant roll gap calibration is mostly at the milling train aspect, and wherein relevant conticaster aspect is less, and mostly is the roll gap measurement device of conticaster.As to invent CN2183233 be a kind of measurement mechanism can be realized the conticaster roll gap by conticaster with dummy bar automatic measurement.The off-line calibration fado adopts roll gap measurement device or dummy bar to demarcate.
Summary of the invention
Low in order to solve existing roll gap calibration technical efficiency, there is weak points such as implementing gently to depress back bloom quality instability, the invention provides a kind of control method of roll gap of energy on-line proving large square bland continuous-casting machine straightening roller.The present invention realizes online demarcation to bloom straightening machine roll gap by the on-line proving program in opening the process of watering.
The technical solution adopted for the present invention to solve the technical problems is:
(1) determines the target pulling rate v of on-line proving roll gap
0
Determine the target pulling rate v of on-line proving roll gap according to the default setting pulling rate of gently depressing scheme
0The setting pulling rate of gently depressing scheme is the target pulling rate of on-line proving roll gap, the terminal point that solidifies according to steel grade drops on position in the straightening machine, make the position that terminal point drops on second from the bottom or third from the bottom straightening roller of solidifying of steel grade by the control pulling rate, the position of dropping on penult straightening roller that wherein two-phase section of steel grade is bigger, the position of dropping on third from the bottom straightening roller that the two-phase section of steel grade is less;
(2) number of record gap values between rollers and instantaneous roll gap
As average pull rate v by the 1# roller
0-0.01＞v
Mean＞v
0+ 0.01 and variance δ＜0.008 o'clock, write down instantaneous gap values between rollers second every t
Number n with instantaneous roll gap
j, t is between 1 and 7, and j is a roller number;
Average pull rate
Be the instantaneous pulling rate every resulting section unit t second, n
iThe number of times of the instantaneous pulling rate that begins to add up for being born from crystallizer;
(3) calculate the mean value S of each roller gap
iAnd with the mean value S of 1# roller gap
1Between poor D
i
(4) mark plain-barreled roll seam
Roll gap difference D according to step (3)
iEach straightening roller is marked flat, the gap values between rollers+D of gap values between rollers=No. 1 roller of straightening roller i
i
Wherein, the gap values between rollers of No. 1 roller is this gap values between rollers of strand section unit through the 1# roller time.
To the strand from the crystallizer birth is that order is divided into different section unit with time, the content of section unit record comprises gap values between rollers, pulling rate, cast length, heat (batch) number, life-span etc., the section unit all can write down gap values between rollers every the regular hour, can arbitrarily extract the gap values between rollers in the section unit if necessary.The section unit writes down gap values between rollers, t interval 1～7 second second every t among the present invention.
This method is applicable to bloom size 220～380mm * 300～480mm, continuous casting pulling rate 0.50～0.80m/min, 20～40 ℃ of the degrees of superheat.
Beneficial effect of the present invention: adopt online roll gap calibration method of the present invention, can whenever water the inferior demarcation of carrying out roll gap when watering of opening, can guarantee to preset and depress the accurate enforcement of scheme and then obviously reduce the strand center segregation, reduce even eliminate the appearance of central pipe and center porosity.
Description of drawings
Fig. 1 is the schematic diagram before and after the roll gap calibration;
Fig. 2 is the flow chart of online roll gap calibration;
Fig. 3 is No. 1 roller average pull rate calculation flow chart;
Fig. 4 is the schematic diagram of the online detection of roll gap;
Fig. 5 is by roll gap difference mark plain-barreled roll seam schematic diagram.
The specific embodiment
In conjunction with the accompanying drawings the present invention is described further:
As shown in Figure 1, the straightening roller is uneven before not demarcating, and promptly other roller gap value and 1# roller are inconsistent.When the straightening roller is implemented gently to depress, be to be measuring roll, do not drop into gently and depress that other depress roller then deducts drafts on 1# roller gap basis, so need demarcate each roller gap with the 1# roller.Consistent by each roll gap after the on-line proving with the 1# roller.
As shown in Figure 2, the flow chart of online roll gap calibration of the present invention may further comprise the steps:
(1) determines the target pulling rate
According to steel grade and casting machine manufacturing condition, determine the suitable scheme of gently depressing, determine the target pulling rate v of on-line proving roll gap according to the default setting pulling rate of gently depressing scheme
0, the setting pulling rate of the scheme of gently depressing is the target pulling rate of on-line proving roll gap.Wherein gently depress set pulling rate determine drop on position in the straightening machine according to the terminal point that solidifies of certain steel grade, make the position that terminal point drops on each and every one straightening roller second from the bottom or third from the bottom of solidifying of certain steel grade by the control pulling rate, size according to the two-phase section of different steel grades is determined, two-phase section is bigger drops on penult, and less drops on third from the bottom.
(2) number of record gap values between rollers and instantaneous roll gap
To the strand from the crystallizer birth is that order is divided into different section unit with time, and time interval scope 1-7s can get 5s, and the attribute of these unit comprises: pulling rate, cast length, heat (batch) number, life-span etc.During on-line proving, by the tracking to pulling rate, judge whether the average pull rate of 1# roller is stable, the calculation process of average pull rate as shown in Figure 3.Average pull rate v by the section unit
MeanJudge with variance δ whether pulling rate is stabilized to target pulling rate v
0, average pull rate is
Be the instantaneous pulling rate every the resulting section of 5s unit, n
iThe number of times of the instantaneous pulling rate that begins to add up for being born from crystallizer; Variance is
。As average pull rate v by 1# roller section unit
0-0.01＞v
Mean＞v
0+ 0.01 and variance δ＜0.008, think that this moment pulling rate is stable, can carry out 1# roller gap detection record.
Begin strand is demarcated after pulling rate is stable, enter the demarcation state, calibration process as shown in Figure 4.After entering detected state, the 1# roller detects the 3m strand that detects section and pass through the 1# roller afterwards from first, and as the test section among Fig. 4, other roller also detects identical test section.When certain straightening roller is passed through in the test section, write down the instantaneous gap values between rollers of this straightening roller every 5s
, record adds up to n
i, i is a roller number.
(3) calculate the mean value S of each roller gap
iAnd with the mean value S of 1# roller gap
1Between poor D
i
The instantaneous gap values between rollers of each roller that obtains according to step (2)
With the record frequency n
i, ask the mean value of each roll gap then
All the other each rollers and 1# roller are poor D
i=S
i-S
1
(4) mark plain-barreled roll seam
Mark flat according to the roll gap difference that step (3) obtains to each roller.As shown in Figure 5 after demarcation is finished, as certain section unit P
0In 1# roller following time, the gap values between rollers of record 1# roller, and be written to the section unit; This unit P that cuts into slices
0When going to following time of straightening roller i, the gap values between rollers+D of gap values between rollers=No. 1 roller of the straightening roller i of this moment
iExcept that No. 1 roller, other each cycle of each roller all can calculate once, realizes flat each straightening roller of mark.
Embodiment (one)
(1) casting machine device parameter: full arc shape large square bland continuous-casting machine, radius 12m, the aligning section of straightening machine and horizontal segment casting roller diameter 450mm, casting machine metallurgical length 33.149m (liquid level is to the flame cutting machine initial point).The distribution of straightening roller is as shown in table 1.
Each roller position of table 1 straightening machine
(2) strand size 280mm * 325mm, steel grade is GCr15, and depressing total amount is 10mm, and steel grades, cast temperature and pulling rate are as shown in table 2.
Table 2 steel grades, cast temperature and pulling rate
(3) during the integral bearing steel, when pulling rate was 0.78m/min, solidifying the final position was 23.4m, so the setting pulling rate of gently depressing is 0.78m/min, determined that the target pulling rate of roll gap calibration also is 0.78m/min.
(4) cold base strand size and setting drafts are as shown in table 3.
The table of comparisons of table 3 heat (batch) number, cold base size and setting drafts
Table 3 is the experimental datas in the hot examination process of bearing steel GCr15, carries out according to YB/T2011-2004 " continuous casting steel machine square billet and rectangular bloom " standard.As seen after GCr15 adopted on-line proving, the setting drafts of gently depressing can be crossed accurate enforcement.By come into operation conventional detection base sample behind the on-line proving roll gap of tracking, to find and gently depress the base sample of set amount deviation in 0.4mm and can reach 100%, deviation is that 0 base sample can reach 84.27%, detecting the base sample is 89 (comprising heat examination base sample).
Embodiment (two)
(1) each parameter of casting machine equipment such as embodiment ()
(2) strand size 280mm * 325mm, steel grade is SWRH82B, and depressing total amount is 9mm, and steel grades, cast temperature and pulling rate are as shown in table 4.
Table 4 steel grades, cast temperature and pulling rate
When (3) casting SWRH82B, when pulling rate was 0.80m/min, solidifying the final position was 23.3m, so the setting pulling rate of gently depressing is 0.80m/min, determined that the target pulling rate of roll gap calibration also is 0.80m/min.
(4) cold base strand size and setting drafts are as shown in table 5.
The table of comparisons of table 5 heat (batch) number, cold base size and setting drafts
Table 5 is the experimental datas in the hot examination process of SWRS82B, and detection method is with bearing steel GCr15.As seen after SWRH82B adopted on-line proving, the setting drafts of gently depressing can be crossed accurate enforcement.By come into operation conventional detection base sample behind the on-line proving roll gap of tracking, to find and gently depress the base sample of set amount deviation in 0.4mm and can reach 100%, deviation is that 0 base sample can reach 87.84%, detecting the base sample is 148 (comprising heat examination base sample).
Embodiment (three)
(1) each parameter of casting machine equipment such as embodiment ()
(2) strand size 280mm * 325mm, steel grade is SWRH72A, and depressing total amount is 9mm, and steel grades, cast temperature and pulling rate are as shown in table 6.
Table 6 steel grades, cast temperature and pulling rate
When (3) casting SWRH72A, when pulling rate was 0.75m/min, solidifying the final position was 22.0m, so the setting pulling rate of gently depressing is 0.75m/min, determined that the target pulling rate of roll gap calibration also is 0.75m/min.
(4) cold base strand size and setting drafts are as shown in table 7.
The table of comparisons of table 7 heat (batch) number, cold base size and setting drafts
Table 7 is the experimental datas in the hot examination process of SWRS72A, and detection method is with bearing steel GCr15.As seen after adopting on-line proving, the setting drafts of gently depressing can be crossed accurate enforcement.By come into operation conventional detection base sample behind the on-line proving roll gap of tracking, to find and gently depress the base sample of set amount deviation in 0.4mm and can reach 100%, deviation is that 0 base sample can reach 86.21%, detecting the base sample is 58 (comprising heat examination base sample).
Claims (3)
1, a kind of control method of pulling-straightening roller gap under light pressure of bloom caster on-line proving is characterized in that may further comprise the steps:
(1) determines the target pulling rate v of on-line proving roll gap
0
Determine the target pulling rate v of on-line proving roll gap according to the default setting pulling rate of gently depressing scheme
0The setting pulling rate of gently depressing scheme is the target pulling rate of on-line proving roll gap, the terminal point that solidifies according to steel grade drops on position in the straightening machine, make the position that terminal point drops on second from the bottom or third from the bottom straightening roller of solidifying of steel grade by the control pulling rate, the position of dropping on penult straightening roller that wherein two-phase section of steel grade is bigger, the position of dropping on third from the bottom straightening roller that the two-phase section of steel grade is less;
(2) number of record gap values between rollers and instantaneous roll gap
As average pull rate v by the 1# roller
0-0.01＞v
Mean＞v
0+ 0.01 and variance δ＜0.008 o'clock, write down instantaneous gap values between rollers second every t
Number n with instantaneous roll gap
j, t is between 1 and 7, and j is a roller number;
Average pull rate
Be the instantaneous pulling rate every resulting section unit t second, n
iThe number of times of the instantaneous pulling rate that begins to add up for being born from crystallizer;
(3) calculate the mean value S of each roller gap
iAnd with the mean value S of 1# roller gap
1Between poor D
i
D
i＝S
i-S
1；
(4) mark plain-barreled roll seam
Roll gap difference D according to step (3)
iEach straightening roller is marked flat, the gap values between rollers+D of gap values between rollers=No. 1 roller of straightening roller i
i
Wherein, the gap values between rollers of No. 1 roller is this gap values between rollers of strand section unit through the 1# roller time.
2,, it is characterized in that described target pulling rate 0.50～0.80m/min, 20～40 ℃ of the degrees of superheat according to the control method of the described pulling-straightening roller gap under light pressure of bloom caster on-line proving of claim 1.
3,, it is characterized in that bloom size 220～380mm * 300～480mm according to the control method of the described pulling-straightening roller gap under light pressure of bloom caster on-line proving of claim 1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100116793A CN101554650B (en) | 2009-05-22 | 2009-05-22 | Method for controlling online calibration of pulling-straightening roller gap under light pressure of bloom caster |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100116793A CN101554650B (en) | 2009-05-22 | 2009-05-22 | Method for controlling online calibration of pulling-straightening roller gap under light pressure of bloom caster |
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|---|---|
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| CN101554650B CN101554650B (en) | 2011-01-26 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102000789A (en) * | 2010-12-08 | 2011-04-06 | 中冶连铸技术工程股份有限公司 | Continuous casting machine and small square billet soft reduction device |
| CN104858385A (en) * | 2015-05-22 | 2015-08-26 | 中冶连铸技术工程有限责任公司 | Light reduction or heavy reduction control method and device based on billet caster |
| CN105033214A (en) * | 2015-08-28 | 2015-11-11 | 东北大学 | Basic roll gap making method for wide and thick slab casting machine |
| CN105458204A (en) * | 2014-09-10 | 2016-04-06 | 上海梅山钢铁股份有限公司 | Crystallizer hot working state recognition device and method |
| CN106001478A (en) * | 2016-07-08 | 2016-10-12 | 首钢总公司 | Formulating method of slab continuous casting machine foundation roller gap technology |
| CN107583961A (en) * | 2017-10-16 | 2018-01-16 | 辽宁科技大学 | A kind of cold continuous rolling is without strip roll gap calibration control method |
| CN114054708A (en) * | 2021-10-18 | 2022-02-18 | 首钢集团有限公司 | Roll gap control method and device |
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2009
- 2009-05-22 CN CN2009100116793A patent/CN101554650B/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102000789A (en) * | 2010-12-08 | 2011-04-06 | 中冶连铸技术工程股份有限公司 | Continuous casting machine and small square billet soft reduction device |
| CN102000789B (en) * | 2010-12-08 | 2013-01-30 | 中冶连铸技术工程股份有限公司 | Continuous casting machine and small square billet soft reduction device |
| CN105458204A (en) * | 2014-09-10 | 2016-04-06 | 上海梅山钢铁股份有限公司 | Crystallizer hot working state recognition device and method |
| CN105458204B (en) * | 2014-09-10 | 2017-12-19 | 上海梅山钢铁股份有限公司 | Crystallizer heat engineering state identification device and method |
| CN104858385A (en) * | 2015-05-22 | 2015-08-26 | 中冶连铸技术工程有限责任公司 | Light reduction or heavy reduction control method and device based on billet caster |
| CN105033214A (en) * | 2015-08-28 | 2015-11-11 | 东北大学 | Basic roll gap making method for wide and thick slab casting machine |
| CN105033214B (en) * | 2015-08-28 | 2017-03-22 | 东北大学 | Basic roll gap making method for wide and thick slab casting machine |
| CN106001478A (en) * | 2016-07-08 | 2016-10-12 | 首钢总公司 | Formulating method of slab continuous casting machine foundation roller gap technology |
| CN106001478B (en) * | 2016-07-08 | 2018-01-23 | 首钢总公司 | A kind of formulating method of slab caster basis roll gap technique |
| CN107583961A (en) * | 2017-10-16 | 2018-01-16 | 辽宁科技大学 | A kind of cold continuous rolling is without strip roll gap calibration control method |
| CN107583961B (en) * | 2017-10-16 | 2018-11-16 | 辽宁科技大学 | A kind of cold continuous rolling is without strip roll gap calibration control method |
| CN114054708A (en) * | 2021-10-18 | 2022-02-18 | 首钢集团有限公司 | Roll gap control method and device |
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