CN107983777B - Speed control method for steel rolling process - Google Patents
Speed control method for steel rolling process Download PDFInfo
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- CN107983777B CN107983777B CN201711296902.4A CN201711296902A CN107983777B CN 107983777 B CN107983777 B CN 107983777B CN 201711296902 A CN201711296902 A CN 201711296902A CN 107983777 B CN107983777 B CN 107983777B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2275/00—Mill drive parameters
- B21B2275/02—Speed
- B21B2275/06—Product speed
Abstract
The invention discloses a speed control method for a steel rolling process, which mainly depends on the existing control system for steel rolling production, reconstructs the regulation relation of speed increasing and speed reducing of each frame by a frame biting current signal during production, realizes the conversion that the original steel-drawing rolling state is changed into speed-increasing rolling and the original steel-piling rolling state is changed into micro-steel-drawing rolling, effectively reduces the head-tail size difference of a steel bar, shortens the length of unqualified head-tail size parts, reduces the waste cutting amount and improves the yield.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a speed control method for a steel rolling process.
Background
Along with the construction of high-rise buildings, underground tunnels, oceans, oil and natural gas exploration platforms and other heavy projects, the market has increasingly vigorous demand for large-size steel products and higher quality requirements. In order to obtain the maximum market competitive advantage, production enterprises compete to develop large-specification deformed steel bars, and the maximum-specification deformed steel bars in the market at present reach phi 60.
For rolling large-specification deformed steel bars, because of large rolling load, the deformed steel bars are usually required to be rolled off a stand, and the finished stand is usually selected to be pre-finish rolled or medium rolled; the disadvantages of such a process arrangement are: the production line has no loop between rolling mills, the frames are basically rolled under tension during normal rolling, the head and tail sizes of the deformed steel bar are greatly different, the head or tail longitudinal ribs are unqualified, and the general expression is that the head and tail longitudinal ribs are larger and the middle part is smaller; the production of the deformed steel bars has the main competitive advantages of yield and cost, and the whole production line is not provided with special grinding and finishing equipment like an industrial bar production line; when rolling large-specification deformed steel bars, the scrap cutting amount of the head and the tail of the deformed steel bars has to be increased to ensure the qualified product size, so that the overall economic benefit is seriously influenced.
Disclosure of Invention
The invention aims to provide a speed control method for a steel rolling process, which has the advantages of effectively improving the phenomenon of unqualified head and tail sizes of deformed steel bars, improving the yield and reducing the production cost.
The technical scheme includes that the speed control method used in the steel rolling process comprises a plurality of rolling mills, the rolling mills comprise a plurality of series K1, K2 and K3-Kn, the K1 is a finished product pass rolling mill series, the K2 is a finished product previous pass rolling mill series, the K3 is a finished product previous pass rolling mill series, the Kn is an initial rolling mill series, and the control method comprises the following steps:
(1) programming and inputting a program of the rolling mill according to the diameter of the required finished product deformed steel bar;
(2) the deformed steel enters from Kn to start steel rolling;
(3) When K1 bites steel, delaying for a plurality of ms, and then K2-Kn cascade speed increasing;
(4) and when a current signal that the tail of the deformed steel bar leaves the K3 is obtained, delaying for a plurality of ms, and then carrying out K2-Kn cascade speed reduction.
By adopting the technical scheme, when the deformed steel bar is rolled by the steps, the middle part of the deformed steel bar is in micro-tension rolling between the K1-K2 frames, the screw tail part is in steel drawing rolling between the K1-K2 frames, and the steel rolling operation is carried out under the working state of a high-speed rolling mill, so that the phenomena that the tail part of the deformed steel bar is larger and the middle part of the deformed steel bar is smaller are effectively solved, the size qualification rate of the deformed steel bar production is ensured, and the cost is reduced.
The invention is further configured to: when K1 bites steel, delaying for 50-100 ms, K2-Kn cascade speed increasing.
By adopting the technical scheme, the time delay is in a reasonable range, so that the good steel rolling work of the deformed steel bar is realized when the speed of K2-Kn is increased.
The invention is further configured to: when a current signal that the tail part of the deformed steel bar leaves the K3 is obtained, and after the time delay is 300ms-1400ms, the K2-Kn cascade connection speed reduction is carried out.
By adopting the technical scheme, the delay time is in a reasonable range, so that the K2-Kn speed reduction can not cause the waste of the power of the rolling mill, and meanwhile, the steel rolling work of the later deformed steel bar is facilitated.
The invention is further configured to: K2-Kn cascade acceleration or deceleration is 0.3% -0.5%.
by adopting the technical scheme, the speed reduction and the speed increase are controlled within a reasonable range, so that the deformed steel bar is reasonably and reliably processed.
The invention is further configured to: the K1 running speed is 1000-1500 r/min.
through adopting above-mentioned technical scheme, K1's functioning speed control is in reasonable within range, is convenient for carry out reasonable processing to the screw-thread steel.
The invention is further configured to: the K2 running speed is 1200-1700 r/min.
Through adopting above-mentioned technical scheme, K2's functioning speed control is in reasonable within range, is convenient for carry out reasonable processing to the screw-thread steel.
The invention is further configured to: the K3 running speed is 1500-2000 r/min.
Through adopting above-mentioned technical scheme, K3's functioning speed control is in reasonable within range, is convenient for carry out reasonable processing to the screw-thread steel.
The invention is further configured to: the K2-Kn cascade accelerates or decelerates by 0.4 percent.
By adopting the technical scheme, the most reasonable speed of the rolling mill during speed reduction and speed increase is disclosed, and the deformed steel bar can be conveniently and reasonably processed.
In conclusion, the invention has the following beneficial effects:
1. The reasonable processing of the deformed steel bar can be realized through a simple control program, the phenomena of large head and tail sizes and small middle size of the deformed steel bar are effectively avoided, and the qualified rate of the deformed steel bar production is improved;
2. in the operation process, the speed-up speed amplitude and the speed-up time node of the rolling mill are reasonably controlled, and the size stability of the steel bar and the qualified rate of the thread steel production are further improved.
Drawings
FIG. 1 is a table of the relationship between different gauge deformed steel bars and rolling mill passes;
FIG. 2 is a schematic diagram of the speed control method used in the steel rolling process.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
example (b): a speed control method for steel rolling process comprises a plurality of rolling mills, wherein the rolling mills comprise a plurality of series of K1, K2 and K3-Kn, screw-thread steels with different diameters have different rolling mill series, as shown in figure 1;
As shown in fig. 2, the K1 is a final pass rolling mill train, the K2 is a final pass rolling mill train, the K3 is a final pass rolling mill train, the Kn is an initial rolling mill train, and the control method includes the steps of:
(1) Programming and inputting a program of the rolling mill according to the diameter of the required finished product deformed steel bar;
(2) The deformed steel enters from Kn to start steel rolling;
(3) when K1 bites steel, delaying for 50-100 ms, and then K2-Kn cascade accelerating for 0.3-0.5%;
(4) and when a current signal that the tail of the deformed steel bar leaves K3 is obtained and is delayed for 300-1400 ms, the K2-Kn cascade connection speed reduction is 0.3-0.5%.
the above steps will now be described by way of example.
(1) ∅ 50 screw-thread steel: the rolling mill comprises K1, K2, K3, K4, K5, K6, K7 and K8, wherein K1 is a 10 th rolling mill, K2 is a 9 th rolling mill, K3 is an 8 th rolling mill, K4 is a 7 th rolling mill, K5 is a 6 th rolling mill, K6 is a 5 th rolling mill, K7 is a 4 th rolling mill, K8 is a 3 rd rolling mill, all the rolling mills in K1-K8 are sequentially arranged in a production line, and K1-K8 belong to the rough and medium rolling process.
According to the diameter requirement of ∅ 50 threaded steel, inputting a corresponding program in a rolling mill control system in advance, gradually entering the head of a steel billet into other rolling mills from the tail end of K8 to start steel rolling, obtaining a relevant current signal by the rolling mill control system when the head of the steel billet reaches K1 passes, delaying for 100ms, and then cascading all the rolling mills from K2 to K8 passes to increase the speed by 0.4 percent, so that micro-stack steel rolling of rolled pieces among racks is realized, and the size of a steel bar is favorably increased; when the tail of the steel billet completely leaves K3 passes, the rolling mill control system obtains a relevant current signal again, and after the time delay is 300ms, all rolling mills in K2-K8 passes are subjected to cascade speed reduction by 0.4%, so that the steel billet part in K2 and K1 passes is subjected to steel drawing rolling, and the size of the steel bar is favorably reduced; through the operation control to the steel rolling system, the head and the tail of the deformed steel bar can be effectively and respectively subjected to automatic speed increasing and reducing control, the steel pulling phenomenon of the middle part is reduced, the head and tail sizes of the steel bar are reduced, the waste cutting amount is reduced, the problems that the head and the tail sizes of the deformed steel bar are large and the middle size is small are effectively solved, the size qualified rate of the deformed steel bar production is ensured, and the cost is saved.
(2) ∅ 40 deformed steel: the rolling mill comprises K1, K2, K3, K4, K5, K6, K7, K8, K9, K10, K11 and K12, wherein K1 is a 14 th rolling mill, K2 is a 13 th rolling mill, K3 is a 12 th rolling mill, K4 is an 11 th rolling mill, K5 is a 10 th rolling mill, K6 is a 9 th rolling mill, K7 is an 8 th rolling mill, K8 is a 7 th rolling mill, K9 is a 6 th rolling mill, K10 is a 5 th rolling mill, K11 is a 4 th rolling mill, K12 is a 3 rd rolling mill, all the rolling mills in K1-K12 are sequentially arranged in a production line, K3 and K4 are empty sections, K5-K10 all belong to rough rolling intermediate sections, and K1-K2 belong to finish rolling sections.
According to the diameter requirement of ∅ 40 deformed steel bar, inputting a corresponding program into a rolling mill control system in advance, gradually entering the head of a steel billet into other rolling mills from K12, starting rolling, and after the head of the steel billet is bitten into a rolling mill with K1 passes, obtaining a relevant current signal by the rolling mill control system, delaying 80ms, and then cascading all the rolling mills with K2-K12 passes by 0.4%, so that micro-stacking steel rolling of rolled pieces among racks is realized, and the size of the steel bar is increased; when the tail of the steel billet completely leaves K3 passes, the rolling mill control system obtains related current signals again, the time delay is 1200ms, all rolling mills in K2-K12 passes are in cascade connection and the speed reduction is 0.4%, so that the tail part of the steel billet in K2 and K1 passes is in steel drawing rolling, and the size of the steel bar is favorably reduced.
(3) ∅ 32 deformed steel: the method comprises K1, K2, K3, K4, K5, K6, K7, K8, K9, K10, K11, K12, K13 and K14, wherein K1 is a 16 th rolling mill, K2 is a 15 th rolling mill, K3 is a 14 th rolling mill, K4 is a 13 th rolling mill, K5 is a 12 th rolling mill, K6 is an 11 th rolling mill, K7 is a 10 th rolling mill, K8 is a 9 th rolling mill, K9 is an 8 th rolling mill, K10 is a 7 th rolling mill, K11 is a 6 th rolling mill, K12 is a 5 th rolling mill, K13 is a 4 th mill, K14 is a 3 rd mill, and K14-K14 are arranged in sequence in a production line, wherein K14 and K14-K14 pass rolling mills belong to a rough rolling process and K14-K14 finish rolling process.
Inputting a corresponding program in a rolling mill control system in advance according to the diameter requirement of ∅ 32 deformed steel bar, gradually entering the head of the steel billet into other rolling mills from a K14 pass rolling mill, starting rolling, obtaining a relevant current signal by the rolling mill control system when the head of the steel billet reaches K1 passes, delaying for 50ms, and then cascading all the rolling mills from K2 to K14 passes by 0.3 percent, thereby realizing micro-stack steel rolling of the steel billet rolled piece between racks and being beneficial to the size enlargement of the steel bar; when the tail of the steel billet completely leaves K3 passes, the rolling mill control system obtains related current signals again, after the time delay of 1400ms, all rolling mills in K2-K14 passes are in cascade connection with the speed reduction of 0.3%, and the time delay of 1400ms is in the speed reduction state, so that the tail part of the rolled piece of the steel billet in K2 and K1 passes is in steel drawing rolling, and the size reduction of the steel bar is facilitated.
in this embodiment, the operation speed of K1 is 1000-1500r/min, the operation speed of K2 is 1200-1700r/min, and the operation speed of K3 is 1500-2000 r/min.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. A speed control method for a steel rolling process comprises a plurality of rolling mills, and is characterized in that: the rolling mill comprises a plurality of series K1, K2 and K3-Kn, wherein the series K1 is a rolling mill series of a finished product pass, the series K2 is a rolling mill series of a finished product previous pass, the series K3 is a rolling mill series of a finished product previous pass, the series Kn is an initial rolling mill series, and the control method comprises the following steps:
(1) Programming and inputting a program of the rolling mill according to the diameter of the required finished product deformed steel bar;
(2) the deformed steel enters from Kn to start steel rolling;
(3) When K1 bites steel, delaying for a plurality of ms, and then K2-Kn cascade speed increasing;
(4) And when a current signal that the tail of the deformed steel bar leaves the K3 is obtained, delaying for a plurality of ms, and then carrying out K2-Kn cascade speed reduction.
2. a speed control method for use in a steel rolling process according to claim 1, wherein: when K1 bites steel, and after a delay of 50ms-100ms, the speed of K2-Kn cascade is increased.
3. A speed control method for use in a steel rolling process according to claim 1, wherein: when a current signal that the tail part of the deformed steel bar leaves the K3 is obtained, and after the time delay is 300ms-1400ms, the K2-Kn cascade connection speed reduction is carried out.
4. A speed control method for use in a steel rolling process according to claim 1, wherein: K2-Kn cascade acceleration or deceleration is 0.3% -0.5%.
5. A speed control method for use in a steel rolling process according to claim 1, wherein: the K1 running speed is 1000-1500 r/min.
6. A speed control method for use in a steel rolling process according to claim 1, wherein: the K2 running speed is 1200-1700 r/min.
7. A speed control method for use in a steel rolling process according to claim 1, wherein: the K3 running speed is 1500-2000 r/min.
8. A speed control method for use in a steel rolling process according to claim 1, wherein: the K2-Kn cascade accelerates or decelerates by 0.4 percent.
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| CN201711296902.4A CN107983777B (en) | 2017-12-08 | 2017-12-08 | Speed control method for steel rolling process |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108856306B (en) * | 2018-06-25 | 2020-02-11 | 中冶京诚工程技术有限公司 | Head-to-tail continuous steel feeding rolling method and system |
| CN111774421A (en) * | 2020-06-22 | 2020-10-16 | 江苏永钢集团有限公司 | Rod and wire rod rough rolling head rear-end collision feeding control method |
| CN112077150B (en) * | 2020-08-11 | 2022-04-08 | 中天钢铁集团有限公司 | Control method for effectively reducing waste cutting of long material production line |
| CN112453066B (en) * | 2020-10-27 | 2022-07-29 | 中天钢铁集团有限公司 | Control method for stably controlling steel passing interval of high-speed wire steel rolling |
| CN113600622B (en) * | 2021-07-23 | 2023-08-11 | 首钢水城钢铁（集团）有限责任公司 | Method for controlling size of finished product full bar through multi-line bar segmentation |
| CN114130813A (en) * | 2021-11-30 | 2022-03-04 | 张家港宏昌钢板有限公司 | Head tension adjusting method for controlling cutting uniformity of deformed steel bar |
| CN115382923B (en) * | 2022-08-31 | 2023-06-09 | 唐山市玉田金州实业有限公司 | Reducing sizing mill for high-speed wire rod and production process thereof |
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