CN108838236B - Control method for uncoiling tower shape of strip steel - Google Patents
Control method for uncoiling tower shape of strip steel Download PDFInfo
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- 239000002994 raw material Substances 0.000 claims abstract description 32
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
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Abstract
The invention discloses a control method of an uncoiling tower shape of strip steel, which comprises the following steps: clamping the inner ring of the raw material coil which is off-line from the rolling mill; uncoiling and feeding the raw material coil subjected to the clamping operation to obtain a fed coil; adjusting the pressure of a compression roller of the feeding coil according to the uncoiling parameter of the feeding coil; and adjusting the tension of an uncoiler according to the radius of the feeding coil to obtain a first tension, and controlling the feeding coil by the first tension. The method solves the problem that the uncoiling tower shape of the strip steel is easy to generate in the production of the galvanized product in the prior art.
Description
Technical Field
The invention relates to the technical field of galvanized product production, in particular to a control method of an uncoiling tower shape of strip steel.
Background
With the development of the domestic steel industry market, the adjustment of product structure, the development and expansion of specification and the upgrading of quality become the main research directions of steel enterprises. Among the galvanized products produced by the hot galvanizing unit, the ultrathin galvanized products with the thickness of less than 0.35mm are mainly applied to back plates, side plates and panels of white household appliances such as washing machines, refrigerators, air conditioners and the like, and have higher requirements on the surface quality of the products. With the low processing costs and high surface quality requirements faced by home appliance manufacturers, the market demand for home appliance panels to this specification is increasing.
At present, continuous hot galvanizing line is when producing thin specification product, the phenomenon that the inner circle of raw material coil of strip was taken out often can appear when the decoiler is opened a book, the turriform problem of decoiling promptly, it generally begins to take place to open a book the 100 meters of strip head about, increase along with belted steel is opened a book the length, belted steel is opened a book the turriform and can be serious gradually, belted steel takes place the skew in the decoiler dabber gradually, when the frame that rectifies reachs extremely spacing, belted steel skew to the roller edge, thereby lead to unable normal decoiling, the production rhythm and the steady operation of line are produced in the direct influence, the serious condition can lead to producing the line deceleration, great.
Therefore, the problem of the uncoiling tower shape of the strip steel is easy to generate in the production of galvanized products in the prior art.
Disclosure of Invention
The embodiment of the invention provides a control method of a strip steel uncoiling tower shape, which is used for solving the problem that the strip steel uncoiling tower shape is easy to generate in the production of a galvanized product in the prior art.
In order to solve the technical problem, an embodiment of the present invention provides a method for controlling an uncoiling tower shape of strip steel, including:
clamping the inner ring of the raw material coil which is off-line from the rolling mill;
uncoiling and feeding the raw material coil subjected to the clamping operation to obtain a fed coil;
adjusting the pressure of a compression roller of the feeding coil according to the uncoiling parameter of the feeding coil;
and adjusting the tension of an uncoiler according to the radius of the feeding coil to obtain a first tension, and controlling the feeding coil by the first tension.
Optionally, the unwinding parameter includes a radius R, an unwinding angle α, and an elastic-plastic bending moment value M generated by the winding up coil, and the adjusting the pressure P of the winding up roll according to the unwinding parameter of the winding up coil specifically includes:
optionally, the adjusting the tension of the uncoiler according to the radius of the upper coil to obtain the first tension includes:
obtaining a tension coefficient according to the radius of the winding roll;
and adjusting the tension of the uncoiler according to the tension coefficient to obtain the adjusted tension, and taking the adjusted tension as the first tension.
Optionally, the obtaining a tension coefficient according to the radius of the upper coil comprises:
when the radius is 500-1000 mm, the relation between the tension coefficient k and the radius R is that k is 0.0006R + 0.4;
when the radius is 1000-1700 mm, the tension coefficient k is 1;
when the radius is 1700-2200 mm, the relation between the tension coefficient k and the radius R is as follows: k is-0.0006R + 2.02.
Optionally, after the raw material roll subjected to the clamping operation is uncoiled and fed to obtain a fed coil, the method further includes:
and judging whether the center line of the winding up coil is superposed with the center line of the uncoiler unit, if not, adjusting the position of the winding up coil to be superposed with the center line of the uncoiler unit.
Optionally, before the adjusting the position of the upper coil to coincide with the center line of the unwinder, the method further comprises:
obtaining the offset of the upper coil;
and if the offset is greater than a preset offset, setting the offset as the preset offset.
Optionally, the setting the offset to the preset offset specifically includes:
and setting the offset as the preset offset by setting a control function.
Optionally, the setting the offset to the preset offset specifically includes:
setting the offset to the preset offset 500 meters before uncoiling.
Optionally, after the adjusting the tension of the uncoiler according to the radius of the upper coil to obtain the first tension, the method further comprises:
and judging whether the looseness degree of the inner ring of the upper coil exceeds a threshold value, if so, performing offline on the upper coil, and if not, further adjusting the first tension to be a second tension, wherein the second tension is smaller than the first tension.
Optionally, the elastic-plastic bending moment value M generated by the online coil is specifically:
wherein h is the thickness of the strip steel, h1The height of the elastic zone on the cross section of the strip steel is shown, b is the width of the strip steel, and deltas is the yield strength of the strip steel.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
the control method for the uncoiling tower shape of the strip steel, provided by the embodiment of the application, is characterized in that before the raw material coil is uncoiled and uncoiled, the inner ring of the raw material coil which is subjected to coil winding and coil winding from a rolling mill is clamped, the expansion of a mandrel after the coil winding is carried out can be prevented, the phenomenon that the inner ring is loosened is avoided, so that the uncoiling tower shape of the coil winding caused by the coil winding and the coil winding on the coil winding is avoided to a certain extent, the pressure of a compression roller of the coil winding is adjusted according to the uncoiling parameter of the coil winding, the deviation of the inner ring in the operation process of the coil winding can be prevented through adjusting the pressure of the compression roller, the tension of an uncoiler is further adjusted according to the radius of the coil winding on the coil winding, the control is carried out on the coil winding, the uncoiling tension can be adjusted in the coil winding state of the coil winding.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a method of controlling decoiling of strip steel in an embodiment of the present invention;
FIG. 2 is a graph showing the force analysis of the upper coil at the uncoiler in the embodiment of the present invention;
fig. 3 is a tension control diagram of an unwinder in an embodiment of the invention.
Detailed Description
The embodiment of the invention provides a control method of a strip steel uncoiling tower shape, which is used for solving the problem that the strip steel uncoiling tower shape is easy to generate in the production of a galvanized product in the prior art.
In order to solve the technical problems in the prior art, the general idea of the technical scheme provided by the embodiment of the application is as follows:
the quality of the raw material coil is controlled, namely, after the raw material coil is off-line from a rolling mill, the inner ring is clamped, so that the inner ring is prevented from being loosened, the pressure roller pressure of the feeding coil is adjusted according to the uncoiling parameter of the feeding coil, the inner ring can be prevented from deviating in the operation process of the feeding coil through the adjustment of the pressure roller pressure, the tension of an uncoiler is further adjusted according to the radius of the feeding coil, the feeding coil is controlled, the uncoiling tension can be adjusted in the feeding coil state in different sizes, the uncoiling tower shape is prevented, and the problem that the uncoiling tower shape is easily generated in the production of galvanized products in the prior art is solved.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the embodiments and specific features of the embodiments of the present invention are detailed descriptions of the technical solutions of the present invention, and are not limitations of the technical solutions of the present invention, and the technical features of the embodiments and examples of the present invention may be combined with each other without conflict.
In this embodiment, a method for controlling the uncoiling tower shape of strip steel is provided, referring to fig. 1, the method includes:
step S101: clamping the inner ring of the raw material coil which is off-line from the rolling mill;
specifically, the applicant found through a great deal of experiments that when a continuous hot galvanizing production line produces galvanized products, particularly galvanized products with the specification of less than 0.35mm, the inner ring of the raw steel coil is often drawn out when an uncoiler uncoils, namely, the uncoiling tower shape. Through analysis, the uncoiling tower shape phenomenon generally begins to occur about 100 meters of an uncoiling strip head, and the uncoiling tower shape problem of the strip steel becomes more serious along with the increase of the uncoiling length of the strip steel. Specifically, the applicant carried out systematic and comprehensive analysis from three aspects of raw materials, equipment precision and uncoiling process parameters respectively.
(1) Sour rolling raw material production parameter analysis
By back checking the tracking curve of the production process of the acid rolling raw material, the data in the parameter table are found to be normal, the speed curve and the tension curve are both in a reasonable operation range, and the stability of the production process of the acid rolling raw material can be seen to have no obvious influence on the galvanized uncoiling tower shape due to the fluctuation of the production process of the acid rolling raw material.
(2) Shape analysis of sour rolled stock
After the uncoiling tower shape phenomenon is generated, the integral strip steel on the raw material strip shape diagram has no obvious strip shape asymmetry phenomenon, no obvious edge wave, middle wave or rib wave phenomenon and no obvious strip shape unevenness phenomenon, and the influence of the raw material strip shape on the uncoiling tower shape can be eliminated by checking the strip shape of the accident coil.
(3) Uncoiling process parameter analysis
By means of video recording of the production running state of the return-check accident rolls, the phenomenon that the inner rings of the raw material rolls are loosened is found, and the inner rings are obviously bent into an oval shape. From video, the tower appearance was found to be gradual and severe from the start of the run, and was not abrupt in the tape. Then, the coil tail coil is observed to find obvious gaps among the layers, the main reason is that when thin strip steel is produced, as the supporting force of the strip steel is small, once the inner ring of a raw material coil is loosened, a loose layer of contact can be caused to appear on the inner ring when a mandrel expands after the raw material coil is wound, the interlayer friction force is reduced sharply, in the subsequent operation process, the loose layer of contact is gradually expanded, and at the moment, the deviation rectifying action can generate interlayer dislocation, so that the uncoiling tower shape is caused.
In step S101, before the raw material roll is unwound and fed, the embodiment of the present invention performs quality control on the raw material roll, that is, performs a clamping operation on an inner ring of the raw material roll, so as to avoid an inner ring unwinding phenomenon, and the raw material roll may be stuck to the raw material roll after being clamped in a specific implementation process.
Then, step S102 is executed: and (4) uncoiling and feeding the raw material coil subjected to the clamping operation to obtain a fed coil.
Step S103 is performed next: and adjusting the pressure of the compression roller of the winding according to the unwinding parameter of the winding.
Specifically, in the uncoiling process, the uncoiler is provided with a press roller for pressing the upper coil (strip), and the brake torque is increased to facilitate normal uncoiling. In the prior art, the pressure of the press roll is fixed, so that the uncoiling and the material guiding are not facilitated. In the embodiment of the invention, the compression roller force of the feeding coil is dynamically adjusted according to the uncoiling parameters of the feeding coil, the expansion of the loose contact layer in the operation process of the feeding coil can be effectively prevented by adjusting the compression roller pressure, so that the interlayer dislocation of the loose contact layer in the production process is effectively prevented, and the problem that the uncoiling tower shape is easily generated in the production of galvanized products in the prior art is solved.
And step S104 is executed again: and adjusting the tension of the uncoiler according to the radius of the coil to obtain a first tension, and controlling the coil to be coiled with the first tension.
Specifically, during normal unwinding, the tension set value of the unwinder is constant, and the torque applied to the coiler during threading is the maximum, and thus the tower phenomenon is most likely to occur. The general method of calculating the unwinding tension T is: t is δ b, where b is the strip width, h is the strip thickness, and δ is the unit tension. According to the embodiment of the invention, the tension of the uncoiler is adjusted according to the radius of the upper coil, so that the uncoiling tower shape is avoided.
As an alternative embodiment, adjusting the tension of the unwinder according to the radius of the wound coil comprises:
obtaining a tension coefficient according to the radius of the winding roll;
and adjusting the tension of the uncoiler according to the tension coefficient.
Specifically, the radius may be measured first, and then the tension coefficient may be obtained from the correspondence between the radius and the tension coefficient.
As an alternative embodiment, obtaining the tension coefficient according to the radius of the wound coil comprises:
when the radius is 500-1000 mm, the relation between the tension coefficient k and the radius R is that k is 0.0006R + 0.4;
when the radius is 1000-1700 mm, the tension coefficient k is 1;
when the radius is 1700-2200 mm, the relation between the tension coefficient k and the radius R is as follows: k is-0.0006R +2.02
Specifically, when a thin-gauge galvanized product is actually produced, the tension of the uncoiler is increased by a coefficient, and the coefficient is adjusted according to the change of the coil diameter, thereby changing the tension set value. The relation between the radius and the tension coefficient is specifically shown in fig. 3, and the embodiment of the invention designs a tension control method for an uncoiler according to the relation between the radius of the coiled material and the tension coefficient, so that the problem of tower uncoiling is effectively solved.
The embodiment of the invention provides a control method for uncoiling towers of strip steel, relates to an inlet area of a continuous hot galvanizing production line, and is an important control technology for stable production of ultrathin galvanized products. Aiming at the technical research of the stabilization production of the galvanized inlet section, the invention provides a corresponding control method by analyzing a series of key process problems which influence the smooth and stable production line, such as the problem of the uncoiling tower shape of strip steel, and the like, thereby effectively improving the stability of the through plate of the inlet section and realizing the stabilized production of the inlet section. The method has positive promoting effects on further promoting capacity optimization, structure adjustment, cost reduction, quality improvement, market expansion and the like.
In the method provided by the embodiment of the present invention, as an optional implementation manner, the unwinding parameter includes a radius R, an unwinding angle α, and an elasto-plastic bending moment value M generated by the winding-up roll, and the roll pressure P of the winding-up roll is adjusted according to the unwinding parameter of the winding-up roll, specifically:
specifically, as can be seen from the force analysis of the coiling steel strip at the uncoiler, the pressure P of the press roll is related to the sine value, the radius and the bending moment value of the uncoiling angle, so that the corresponding relationship between the pressure P of the press roll and the uncoiling parameter can be obtained, and the force analysis chart is shown in fig. 2. The compression roller pressure can be adjusted according to the specific parameters of the coiling in the mode, so that the coiling machine is suitable for coiled materials of different types and properties. The range of nip pressure for different widths and thicknesses of the upper wraps is shown in table 1.
TABLE 1 compression roller pressure parameters
More specifically, the elastic-plastic bending moment value M generated by the online coil is specifically as follows:
wherein h is the thickness of the strip steel, h1The height of the elastic zone on the cross section of the strip steel is shown, b is the width of the strip steel, and deltas is the yield strength of the strip steel.
In order to ensure the smooth operation of the uncoiler, the embodiment of the present invention uncoils and coils the raw material coil after the clamping operation is performed, and after the coil is obtained, the embodiment of the present invention further includes:
and judging whether the central line of the winding up coil is superposed with the central line of the uncoiler unit, if not, adjusting the position of the winding up coil to be superposed with the central line of the uncoiler unit.
In order to guarantee the centering operation during the uncoiling process, before the position of the coiling is adjusted to be coincident with the central line of the uncoiler, the method further comprises the following steps:
obtaining the offset of the upper coil;
and if the offset is larger than the preset offset, setting the offset as the preset offset.
Specifically, the applicant has found, by analyzing the actual production log data and the practice in the actual production, that there is usually a certain degree of deviation of the on-line coil after the on-line coil is completed, which is determined by the accuracy of the on-line trolley, and therefore it is necessary to start the centering adjustment after the on-line tension operation. According to the embodiment of the invention, the offset of the upper coil relative to the central line of the production line is obtained firstly, and then adjustment is carried out. Generally, the offset is generally far larger than the preset offset in operation, so that the centering adjustment amplitude is large, and the impact on unwinding is also large. In order to reduce the adjustment amplitude, in the embodiment of the present invention, when the offset is greater than the preset offset, the offset is set as the preset offset, and the preset offset may be set according to an actual situation, for example, 5mm, 3mm, 1mm, and the like.
More specifically, setting the offset amount to the preset offset amount may be achieved by:
the offset is set to a preset offset by setting a control function.
Specifically, the method may be implemented by setting a control function in the primary control system, where the control function may be a locker, and when the offset is greater than the preset offset, locking the current offset to the preset offset.
As an optional implementation manner, setting the offset as the preset offset specifically includes:
500 meters before opening a book sets up the offset into presetting the offset to can avoid the centering great action to appear, the centering system is to the horizontal impact force of coil of strip when reducing to open a book, and then reduces the emergence of opening a book turriform.
As an alternative implementation, after the tension of the uncoiler is adjusted according to the radius of the upper coil to obtain the first tension, the method provided by the embodiment of the present invention further includes:
and judging whether the looseness degree of the inner ring of the upper coil exceeds a threshold value, if so, performing offline on the upper coil, and if not, further adjusting the first tension to be a second tension, wherein the second tension is smaller than the first tension.
Specifically, the quality of the wound coil can be judged according to the looseness degree of the inner ring of the wound coil, if the looseness degree exceeds a threshold value, the content of the inner ring is serious, so that the winding-off operation is adopted to avoid influencing the subsequent process, if the inner ring is not loosened or the looseness degree is light, the inlet tension of the wound coil is reduced, namely the first tension is adjusted to be the second tension, specifically, the inlet tension can be adjusted to be 50% -70% of a preset tension value, and further action on the inner ring is reduced in a mode of adjusting the inlet tension. As an optional implementation manner, after the tension is adjusted, the embodiment of the present invention may further dynamically adjust the deviation rectification system, and specifically, the deviation rectification may be adjusted from automatic deviation rectification to manual deviation rectification.
In order to more clearly illustrate the beneficial effects of the embodiments of the present invention, a specific embodiment is described in detail below, and by using the existing zinc-plated product production process, when strip steel is uncoiled, the data statistics of each zinc-plated production line shows that 23 uncoiling turriform problems occur in 1# zinc-plated line in total, and 28 uncoiling turriform problems occur in 2# zinc-plated line in total, which results in 34 production line slowdowns and 6 production line stop accidents in total. After the method is adopted, the phenomenon of tower shape uncoiling can be effectively prevented. The number of times of uncoiling the tower shape of the No. 1 unit of the galvanizing production line is reduced to 6 times from 23 times, and the number of times of uncoiling the tower shape of the No. 2 unit of the galvanizing production line is reduced to 4 times from 28 times, so that a better effect is achieved.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
the control method for the uncoiling tower shape of the strip steel, provided by the embodiment of the application, is characterized in that before the raw material coil is uncoiled and uncoiled, the inner ring of the raw material coil which is subjected to coil winding and coil winding from a rolling mill is clamped, the expansion of a mandrel after the coil winding is carried out can be prevented, the phenomenon that the inner ring is loosened is avoided, so that the uncoiling tower shape of the coil winding caused by the coil winding and the coil winding on the coil winding is avoided to a certain extent, the pressure of a compression roller of the coil winding is adjusted according to the uncoiling parameter of the coil winding, the deviation of the inner ring in the operation process of the coil winding can be prevented through adjusting the pressure of the compression roller, the tension of an uncoiler is further adjusted according to the radius of the coil winding on the coil winding, the control is carried out on the coil winding, the uncoiling tension can be adjusted in the coil winding state of the coil winding.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A control method for uncoiling tower shape of strip steel is characterized by comprising the following steps:
clamping the inner ring of the raw material coil which is off-line from the rolling mill;
uncoiling and feeding the raw material coil subjected to the clamping operation to obtain a fed coil;
judging whether the central line of the upper coil is superposed with the central line of the uncoiler unit, if not, obtaining the offset of the upper coil; if the offset is larger than a preset offset, setting the offset as the preset offset 500 meters before uncoiling, and adjusting the position of the upper coil on the uncoiler unit according to the set preset offset;
adjusting the pressure of a compression roller of the feeding coil according to the uncoiling parameter of the feeding coil;
and adjusting the tension of an uncoiler according to the radius of the feeding coil to obtain a first tension, and controlling the feeding coil by the first tension.
2. The method according to claim 1, characterized in that the unwinding parameters comprise the radius R of the upper coil, the unwinding angle α and the elasto-plastic bending moment value M generated by the upper coil, and the roll pressure P of the upper coil is adjusted according to the unwinding parameters of the upper coil, specifically:
3. the method of claim 1, wherein said adjusting the tension of the unwinder based on the radius of the upper coil to obtain a first tension comprises:
obtaining a tension coefficient according to the radius of the winding roll;
and adjusting the tension of the uncoiler according to the tension coefficient to obtain the adjusted tension, and taking the adjusted tension as the first tension.
4. The method of claim 3, wherein obtaining the tension coefficient based on the radius of the upper coil comprises:
when the radius is 500-1000 mm, the relation between the tension coefficient k and the radius R is that k is 0.0006R + 0.4;
when the radius is 1000-1700 mm, the tension coefficient k is 1;
when the radius is 1700-2200 mm, the relation between the tension coefficient k and the radius R is as follows: k is-0.0006R + 2.02.
5. The method of claim 1, wherein the setting the offset amount to the preset offset amount is specifically:
and setting the offset as the preset offset by setting a control function.
6. The method of claim 1, wherein after said adjusting the tension of the unwinder according to the radius of the upper coil to obtain a first tension, the method further comprises:
and judging whether the looseness degree of the inner ring of the upper coil exceeds a threshold value, if so, performing offline on the upper coil, and if not, further adjusting the first tension to be a second tension, wherein the second tension is smaller than the first tension.
7. The method according to claim 2, characterized in that the values M of the elasto-plastic bending moments generated by the winding are specified as:
wherein h is the thickness of the strip steel, h1The height of the elastic zone on the cross section of the strip steel is shown, b is the width of the strip steel, and deltas is the yield strength of the strip steel.
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| CN111644486A (en) * | 2020-04-27 | 2020-09-11 | 邯郸钢铁集团有限责任公司 | Method for preventing strip steel from being uncoiled and coiled in tower shape |
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| JPS57140831A (en) * | 1981-02-25 | 1982-08-31 | Nippon Steel Corp | Preventing method for slip during unwinding of annealed coil |
| CN102430612B (en) * | 2011-10-20 | 2014-02-05 | 攀钢集团西昌钢钒有限公司 | Operation method for controlling tower shapes of inner and outer rings of steel coils |
| CN104289557A (en) * | 2013-07-16 | 2015-01-21 | 大力神铝业股份有限公司 | Method for controlling aluminum coil to be uncoiled and loosened |
| CN103861895B (en) * | 2014-03-12 | 2016-02-03 | 攀钢集团西昌钢钒有限公司 | Eliminate the method for steel roll tower shaped defect |
| CN106743894B (en) * | 2016-11-18 | 2018-12-14 | 首钢京唐钢铁联合有限责任公司 | Tension control method of uncoiler |
| CN206632133U (en) * | 2017-03-30 | 2017-11-14 | 天津润成铁塔制造有限公司 | A kind of bipyramid head for steel tower production is without expanding-contracting type sawing sheet device |
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2018
- 2018-06-29 CN CN201810712075.0A patent/CN108838236B/en active Active
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