CN102851483A - Method for eliminating strip steel vibration at the fast cool section of continuous annealing furnace - Google Patents
Method for eliminating strip steel vibration at the fast cool section of continuous annealing furnace Download PDFInfo
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- CN102851483A CN102851483A CN2011101808854A CN201110180885A CN102851483A CN 102851483 A CN102851483 A CN 102851483A CN 2011101808854 A CN2011101808854 A CN 2011101808854A CN 201110180885 A CN201110180885 A CN 201110180885A CN 102851483 A CN102851483 A CN 102851483A
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Abstract
The invention involves a strip steel quality control method for a continuous annealing furnace, particularly involves a method for eliminating strip steel vibration at the fast cool section of the continuous annealing furnace. Two sides of the strip steel of the fast cool section are provided with a group of blowers, respectively. The method includes step (1) reducing the strip steel speed to 90-95% of the original value; and step (2) gaining the strip steel tension to 1.02-1.05 times of the original value. The method effectively solves the problem on the vibration of the strip steel passing through a cooling blower, ensures the product quality, improves the production benefit by the effective modification, and reduces further generation of defects of the strip steel.
Description
Technical field
The present invention relates to the strip quality control method of continuous annealing furnace, relate in particular to a kind of continuous annealing furnace zone steel chattering elimination method.
Background technology
In the C612 continuous annealing furnace, the band steel carries out continuous annealing through heating zone, soaking zone, slow cooling section, the stove section such as fast cold section, wherein fast cold section RCS uses the blower fan blowing to realize that the band steel cools off fast, be provided with three groups of cooling blowers among first pass in RCS, every group is comprised of two blower fans, wherein first group of each blower fan of blower fan has two blowing mouths, and second and third each blower fan of group blower fan has three blowing mouths, as shown in Figure 1; After C612 puts into effect, band steel chatter phenomenon often occurs fast cold section of RCS, as above to iris out the zone particularly serious for figure.When flutter was quite serious, the band steel can rub with blower fan, and cause the band steel to wipe and scratch defective, even broken belt.
Hot is the process of a cooling from heating zone through equal forge hot arrival slow cooling section with steel, belt steel temperature can be down to about 660 ℃ in this process, but this also is quite high temperature, technique initialization requirement belt steel temperature is down to about 410 ℃ when entering fast cold section, this just means that belt steel temperature needs to decrease by about 200 ℃ at short notice, in order to reach 200 ℃ the range of decrease, No. 1 cooling blower must add the high-power band steel of advertising, when the thinner and wind-force of supplied materials is larger, band steel stable speed operation reaches threshold value, if slightly having, the too high or air door of fan adjusting angle of speed this moment is not inconsistent, just can cause the flutter of band steel, even produce steel defect.
Chatter phenomenon is not all can produce at all annealed wires, just when producing some band steel material, some annealing furnace occurs, recurrent phenomenon in the Thin Strip Steel annealing operation of rolling particularly, and this is also perplexing spot check production, at present, spot check person can not adopt an effective measure and slows down when flutter occurs.
Summary of the invention
The present invention is intended to address the aforementioned drawbacks, and provides a kind of continuous annealing furnace fast cold section strip steel chattering elimination method.Flutter Problem when the present invention effectively solves with steel process cooling blower has been guaranteed quality product, by effective improvement, has improved productivity effect, has reduced the further generation of steel defect.
For addressing the above problem.
The fast cold section strip steel chattering elimination method of a kind of continuous annealing furnace of the present invention, described fast cold section band steel two is seen both sides and is respectively equipped with one group of blower fan, and it comprises:
The fast cold section strip steel chattering elimination method of described continuous annealing furnace, it also comprises step 3, adjusts air blower: the air door of fan angle of inclination is increased, so that the positive blowing of band steel weakens.
The present invention increases strip tension and air door of fan adjustment is eliminated fast cold section flutter by reducing strip speed, has guaranteed quality product, avoids having an accident.
Description of drawings
Below, the present invention is further illustrated by reference to the accompanying drawings:
Fig. 1 is the synoptic diagram of fast cold section of the continuous annealing furnace studied of invention;
Fig. 2 is band steel wire speed range of decrease distribution plan.
Embodiment
As shown in Figure 1: the fast cold section strip steel chattering elimination method of a kind of continuous annealing furnace, described fast cold section band steel 1 both sides are respectively equipped with one group of blower fan 2, and it comprises: step 1, with steel 1 Speed Reduction original 90-95% extremely; Step 2 is with the original 1.02-1.05 of steel 1 tension force gain trace doubly.
Embodiment:
Because in band steel 1 high-speed cruising, less stable expects to produce easily flutter during blower fan 2 high-power blowing when thin especially, and at this moment, method that can be by the central sections reduction of speed is slowed down the generation of flutter so that the band steel is stable.When rolling unit is the high speed unit, speed generally remains on 600-700mpm, when flutter occurs, strip speed is carried out reduction of speed, stablize by analysis when eliminating flutter, the band steel wire speed range of decrease is normal distribution, so setup control circle, so that having 99.73%, the idea in the control chart drops in the control limit, in medullary ray both sides stochastic distribution, that is to say, control limit is made as medullary ray ± 3 times standard deviation, draws control circle: range of decrease x=7%, the threshold value that historical failure data that Here it is are determined by 95% fiducial limit according to above method.Such as Fig. 2.
That is to say that when flutter occurs the band steel is carried out reduction of speed, the reduction of speed amplitude is 7% of current strip speed.
Tension force between step 2, increase band steel
In when, with steel more serious flutter occuring when, show that the suffered wind-force in band steel both sides is uneven, cause band steel section that larger displacement occurs, strengthen strip tension and set this moment, and the equalizing strip steel is stressed, can eliminate chatter phenomenon.
This tension force setting model is to add that according to the convention analysis that tension force is set the recurrence of measured data comes.According to convention, the principal element that impact is set tension force with steel is: with thickness, width and the speed of steel.Owing to taked compensation in the speed factor aforesaid method, so here just without a moment's thought.The relation of strip tension and thickness and width generally can be described as: the more wide thicker tension force of band steel is also larger.Its mathematic(al) representation is:
Or:
Wherein: T is tension force [N], and Th is thickness [mm], and Wd is width [mm],
Be coefficient.By the field measurement data analysis, model (2) not only can not the Effective Raise precision, and extendability is poorer than model (1) on the contrary, and therefore, we select model (1).According to the convention that tension force is set, generally adopt the formal representation of unit tension, consider the relation of dimension and parameter, it is as follows that (1) formula is become the unit tension form:
Wherein:
The gain factor of setting for reducing the flutter generation, a and b are coefficient, a and b value see the following form:
Table:
Increase strip tension according to the serious situation of band steel flutter, can draw according to statistical study, when occuring, flutter increases strip tension, find through the statistical study that strip tension is constantly increased process, strip tension is crossed conference and broken belt danger occurred, too small generation flutter, when flutter occurring, adjust strip tension so that the hypertension that flutter disappears is normal distribution, so setup control circle, so that having 99.31%, the idea in the control chart drops in the control limit, in medullary ray both sides stochastic distribution, that is to say, control limit is made as medullary ray ± 2.5 times standard deviation, draws control circle: range of decrease x=3%, the threshold value that historical failure data that Here it is are determined by 95% fiducial limit according to above method.Tension force gain 3% can effectively improve flutter situation, then gain factor
=1.03.
For example: for steel grade T-3CA, thickness is 300mm, and width is 900 mm, and the unit tension of fast cold section section is calculated as follows:
（4）
Step 3, adjustment air door of fan
Claims (2)
1. fast cold section strip steel chattering elimination method of continuous annealing furnace, described fast cold section strip steel is respectively equipped with one group of blower fan through both sides, it is characterized in that it comprises:
Step 1 is reduced to original 90-95% to strip speed;
Step 2, the original 1.02-1.05 of strip tension gain trace doubly.
2. the fast cold section strip steel chattering elimination method of continuous annealing furnace according to claim 1 is characterized in that it also comprises step 3, adjusts air blower: the air door of fan angle of inclination is increased, so that the positive blowing of band steel weakens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101808854A CN102851483A (en) | 2011-06-30 | 2011-06-30 | Method for eliminating strip steel vibration at the fast cool section of continuous annealing furnace |
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| CN2011101808854A CN102851483A (en) | 2011-06-30 | 2011-06-30 | Method for eliminating strip steel vibration at the fast cool section of continuous annealing furnace |
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| CN102851483A true CN102851483A (en) | 2013-01-02 |
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| CN2011101808854A Pending CN102851483A (en) | 2011-06-30 | 2011-06-30 | Method for eliminating strip steel vibration at the fast cool section of continuous annealing furnace |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2786140Y (en) * | 2005-03-31 | 2006-06-07 | 宝山钢铁股份有限公司 | High-speed air jetting and laminar flow cooling device for continuous annealing of strip steel |
| CN1962103A (en) * | 2006-11-28 | 2007-05-16 | 中冶南方工程技术有限公司 | Method for preventing vibration of steel bar under high-speed rolling station of ultra-thin plate |
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2011
- 2011-06-30 CN CN2011101808854A patent/CN102851483A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2786140Y (en) * | 2005-03-31 | 2006-06-07 | 宝山钢铁股份有限公司 | High-speed air jetting and laminar flow cooling device for continuous annealing of strip steel |
| CN1962103A (en) * | 2006-11-28 | 2007-05-16 | 中冶南方工程技术有限公司 | Method for preventing vibration of steel bar under high-speed rolling station of ultra-thin plate |
Non-Patent Citations (1)
| Title |
|---|
| 林鹤等: "《轧制液对带钢冷轧机颤振的影响》", 《钢铁》, vol. 31, no. 10, 31 October 1996 (1996-10-31) * |
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Address after: 201900 Shanghai city Baoshan District Meipu Road No. 335 Applicant after: SHANGHAI BAOSTEEL INDUSTRY TECHNOLOGICAL SERVICE Co.,Ltd. Address before: 201900 Shanghai city Baoshan District Meipu Road No. 335 Applicant before: Shanghai Baosteel Industrial Inspection Co.,Ltd. Address after: 201900 Shanghai city Baoshan District Meipu Road No. 335 Applicant after: Shanghai Baosteel Industrial Inspection Co.,Ltd. Address before: 201900 Shanghai city Baoshan District Meipu Road No. 335 Applicant before: Shanghai Baosteel Industry Inspection Corp. |
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Application publication date: 20130102 |