CN117299813A - Control method for hot rolled strip steel coiling shape - Google Patents
Control method for hot rolled strip steel coiling shape Download PDFInfo
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- CN117299813A CN117299813A CN202310938750.2A CN202310938750A CN117299813A CN 117299813 A CN117299813 A CN 117299813A CN 202310938750 A CN202310938750 A CN 202310938750A CN 117299813 A CN117299813 A CN 117299813A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 98
- 239000010959 steel Substances 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004804 winding Methods 0.000 claims abstract description 46
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims description 22
- 238000001514 detection method Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 3
- 241000277275 Oncorhynchus mykiss Species 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 8
- 230000000903 blocking effect Effects 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 238000012937 correction Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/14—Guiding, positioning or aligning work
- B21B39/16—Guiding, positioning or aligning work immediately before entering or after leaving the pass
-
- 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
- B21C47/02—Winding-up or coiling
-
- 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
- B21C47/34—Feeding or guiding devices not specially adapted to a particular type of apparatus
- B21C47/3433—Feeding or guiding devices not specially adapted to a particular type of apparatus for guiding the leading end of the material, e.g. from or to a coiler
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0057—Coiling the rolled product
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Winding, Rewinding, Material Storage Devices (AREA)
Abstract
The invention relates to a control method for hot rolled strip steel coiling shape, which comprises the steps of initially setting the opening degree of a side guide plate to be strip steel width, allowance, first short stroke amount and second short stroke amount, adjusting the opening degree of the side guide plate according to the entering position of the strip steel head, controlling the roll gap of a pinch roll by adopting position control and pressure control, setting the number of turns of a coil-assisting roll to be 2-3, and setting the coiling tension to be 5-30N/mm 2 The coiling advance rate and the coiling lag rate are controlled, the advance rate of the laminar cooling roller way is 10% -25%, the lag rate of the output roller way is 10% -20%, the advance rate of the pinch roller is 4% -15%, the lag rate is 0% -11%, and the coil is coiledThe advance rate of the cylinder is 15-20%, and the advance rate of the auxiliary winding roller is 15-20%; the invention ensures that the head part of the strip steel enters the pinch roll in a good in-team state, obviously reduces the tower-shaped blockage rate of the hot rolled steel coil, improves the coil shape of the tail part of the strip steel, ensures that the coiling is not loosened, greatly improves the coil shape of the steel coil, and improves the yield and economic benefit.
Description
Technical Field
The invention relates to the technical field of hot rolled strip steel, in particular to a control method for the coiling shape of the hot rolled strip steel.
Background
According to the design requirement of a product outline, the hot rolled strip production line has the thickness of 1.2-19 mm and the width of 900-1630 mm, and the variety covers more than 60 varieties of products such as cold rolled raw materials, steel for automobile structures, marine steel, steel for containers, high-strength steel, pipeline steel and the like, the coiling difficulty is very high for wide and thick specification and high-strength series strip steel, the requirement on the coiling capability of a coiling machine is higher and higher, the coiling shape is the most important quality problem in the coiling area, the coiling shape is relatively poor, a slight sleeve lifting phenomenon exists at the inlet of the coiling machine after finish rolling and throwing, the phenomenon increases the risk of overlapping the tail part of the strip steel, meanwhile, the tail part coiling shape is also adversely affected, and from the aspects of production and sales, the tower-shaped strip steel coil can generate the following problems: (1) On a walking beam of a production line, serious tower shapes cause difficult centering and gravity center deviation of steel coils, and turn-over accidents in the transportation process of the walking beam are easy to cause; (2) In the lifting process, the tower shape of the inner ring and the outer ring brings inconvenience to the lifting of the clamp, the clamp is slightly scratched on the protruding strip steel edge, the steel curling is damaged, the protruding strip steel edge is heavy, the clamp cannot contact the inner ring of the steel coil, and the clamp cannot be clamped normally; (3) The larger tower-shaped steel coil is not easy to be shipped, and the packing belt is broken to form loose coils; (4) If the tower-shaped steel coil is rewound by a finishing unit, the cost is increased.
Chinese patent publication No. CN 113275383B discloses an automatic adjustment method for the shape of hot rolled strip coil, which comprises: in response to detecting that the head of the strip steel reaches a set position, driving the auxiliary winding roller to approach the winding drum to start auxiliary winding operation; acquiring the state of the auxiliary winding roller in real time; switching the coiling mode of the auxiliary roller to a stepping mode, a pressure closed-loop control mode or a position closed-loop control mode according to the state of the auxiliary roller so that the auxiliary roller guides the head of the strip steel to be coiled on a winding drum; and in response to detecting that the coiling of the head part of the strip steel is finished, driving the auxiliary winding roller to be far away from the winding drum to finish the auxiliary winding operation. In the process of winding up, different winding control modes are selected according to the states of the winding up roller, so that the winding up roller is ensured to be rapidly and accurately switched to a reasonable control mode under different equipment states, and the winding quality and effective protection equipment are ensured; the switching process is automatically executed without manual intervention, so that the hysteresis and the irregularity of manual adjustment are avoided, the coiling stability of the strip steel is ensured, and the labor intensity is effectively reduced; however, this patent only controls the coil shape from the aspect of the auxiliary winding roller, and cannot realize accurate control of the coil shape of the steel coil.
Chinese patent publication No. CN 110000220B discloses an automatic adjustment method for hot rolled strip coil shape, which sets four parameters, namely, the actual opening degree SG1 of the guide, the set opening degree SG2 of the guide, the working side pressure FW of the guide, and the transmission side pressure FD; when SG1-SG2 is more than 10mm, the guide rule acts by taking the set value as the target value; when FW-FD is more than 5KN, the steel plate is proved to deviate to the working side, if the opening degree change of the guide rule is less than 10mm, the pressure of the working side of the pinch roll is increased, and the steel plate is limited to deviate to the working side until FW-FD is less than 5KN; when FW-FD is less than-5 KN, the steel plate is proved to deviate to the transmission side, if the opening degree change of the guide rule is smaller than 10mm, the pressure of the transmission side of the pinch roll is increased, and the steel plate is limited to deviate to the transmission side until FW-FD is more than-5 KN; when SG1-SG2 is more than 10mm and |FW-FD| > 5KN are simultaneously provided, only the adjustment of the opening degree is executed, and when SG1-SG2 is more than 10mm, the guide rule acts by taking a set value as a target value, the adjustment of pinch roll pressure is not carried out, the offset of the steel plate can be corrected at all times, and the coil shape of the steel coil is ensured; however, the patent does not consider the lead rate and the lag rate caused by the inertia of the tail part of the strip steel, and the phenomenon of unreeling easily occurs.
Disclosure of Invention
The invention provides a control method for coiling shape of hot rolled strip steel, which ensures that the head of the strip steel enters a pinch roll in a good queue state by controlling the opening degree of a side guide plate in the coiling process, obviously reduces the tower-shaped blocking rate of a hot rolled steel coil, reduces the deviation degree of the strip steel by controlling the position and the pressure of the pinch roll, improves the coiling shape of the tail part of the strip steel, and ensures that the coiling is not loosened by controlling the coiling number of a wrapper roll, the coiling tension, the coiling advance rate and the lag rate; greatly improves the coil shape of the steel coil and improves the yield and the economic benefit.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
a control method for the coiling shape of hot rolled strip steel comprises the following steps:
(1) The opening degree of the side guide plate is initially set to be the width of the strip steel, the allowance, the first short stroke amount and the second short stroke amount, and the opening degree of the side guide plate is adjusted according to the entering position of the head part of the strip steel;
(2) The pinch roll gap control adopts position control and pressure control;
(3) Setting the number of turns of the auxiliary winding roller to be 2-3;
(4) The winding tension is set to be 5-30N/mm 2 ；
(5) The coiling advance rate and the coiling lag rate are controlled, the advance rate of the laminar cooling roller way is 10% -25%, the lag rate of the output roller way is 10% -20%, the advance rate of the pinch roller is 4% -15%, the lag rate is 0% -11%, the advance rate of the winding drum is 15% -20%, and the advance rate of the auxiliary winding roller is 15% -20%.
Further, the openings of the side guide plates are initially set to start when the finish rolling working roller F2 bites steel, the head of the strip steel is detected to enter the side guide plates to execute a first short stroke, the side guide plates at the two sides simultaneously close the first short stroke amount/2 inwards, the head of the strip steel is detected to reach the pinch roller to execute a second short stroke, and the side guide plates at the two sides simultaneously close the second short stroke amount/2 inwards.
Further, the margin value of the side guide plate set by the margin of the detection data of the pattern strip steel is reduced by 4-6 mm for the side guide plate with the width smaller than or equal to 1250 mm.
Furthermore, the position control is used before the strip steel bites into the pinch roll, the pinch roll pressure control is used when the strip steel head is wound on the winding drum for 2-3 circles to establish a tension signal, and the strip steel tail is switched back to the position control after leaving the pinch roll.
Compared with the prior art, the invention has the beneficial effects that:
1) The opening degree of the side guide plate in the coiling process is controlled, so that the head of the strip steel enters the pinch roll in a good queue state, and the tower-shaped blocking rate of the hot rolled steel coil is obviously reduced;
2) The deviation degree of the strip steel is reduced by controlling the position and the pressure of the pinch rolls, and the rolling shape of the tail part of the strip steel is improved;
3) The winding non-loose sleeve is ensured by controlling the winding circle number, the winding tension and the winding advance rate and the winding lag rate of the auxiliary winding roller;
4) Greatly improves the coil shape of the steel coil and improves the yield and the economic benefit.
Drawings
FIG. 1 is a schematic view of the short stroke control of the take-up entry side guide of the present invention.
FIG. 2 is a schematic drawing of a carbon steel tension control according to the present invention.
Fig. 3 is a schematic diagram of high strength steel tension control.
Detailed Description
The following is a further description of embodiments of the invention, taken in conjunction with the accompanying drawings:
the invention relates to a control method for coiling shape of hot rolled strip steel, which comprises the following steps:
(1) The opening degree of the side guide plates is initially set to be the width of the strip steel, the allowance D, the first short stroke quantity A and the second short stroke quantity B, the initial setting of the opening degree of the side guide plates is started at the moment when the finish rolling working rolls bite steel, the opening degree of the side guide plates is adjusted according to the entering position of the head of the strip steel, the head of the strip steel enters the side guide plates to execute the first short stroke, the side guide plates at the two sides simultaneously close A/2 inwards, the head of the strip steel is guided for the first time, the head of the strip steel is detected to reach the pinch rolls to execute the second short stroke, the side guide plates at the two sides simultaneously close B/2 inwards, and the head of the strip steel is guided for the second time;
referring to fig. 1, the process control of the first short stroke, the second short stroke, the dynamic adjustment and the manual adjustment is shown in fig. 1, when strip steel enters a pinch roll and passes through 15m, a side guide plate enters a dynamic deviation correction control state, in this state, the opening degree of the side guide plate is dynamically adjusted according to the measured value of a coiling inlet width meter, when the coiling inlet width meter is normal and has no fault, the dynamic deviation correction control is effective, when the width meter has faults, the dynamic deviation correction control is interrupted, the side guide plate moves to a starting position of the dynamic deviation correction control, meanwhile, an operator performs manual intervention on the opening degree of the side guide plate through a monitoring device, and on the basis of dynamic deviation correction, the opening degree of the side guide plate is manually corrected;
the residual quantity value of the side guide plate set by the detection data of the pattern strip steel is reduced by 5mm aiming at the side guide plate with the width smaller than or equal to 1250mm, the tower-shaped blocking rate of the hot rolled steel coil after adjustment is obviously reduced, and the tower-shaped blocking rate before and after adjustment is shown in the table 1:
TABLE 1
| Width of (L) | Equal to 1250mm | Less than 1250mm |
| Adjusting front tower-shaped blocking rate | 2.885％ | 5.240％ |
| Post-adjustment tower-shaped blocking rate | 0.654％ | 3.365％ |
| Rate of decrease | 2.231％ | 1.875％ |
(2) The pinch roll gap control adopts position control and pressure control, before strip steel bites into the pinch roll, the pinch roll gap adopts a position control mode, when the head of the strip steel winds 3 circles on a winding drum, and tension signals are established, the pinch roll gap control is switched from the position control to the pressure control, after the tail of the strip steel leaves the pinch roll, the position control mode of the pinch roll is switched back to the pressure control mode, the strip steel is polished thick at a finish rolling working roll F7, the tension control is lost, the pinch roll is lifted, the pressure of the pinch roll is reduced, the levelness of the pinch roll is regulated, the deviation degree of the strip steel is reduced, and the shape of the tail of the strip steel is improved.
(3) The number of turns of the auxiliary winding roller is set to be 2-3, winding starts to be 2.5 turns, the auxiliary winding roller is wound in a holding state and is performed in a pressure control mode until the number of turns of the winding set to be 2.5 turns is completed, and the auxiliary winding roller is opened after tension is established.
(4) The winding tension is set to be 5-30N/mm 2 The rolling is too tight to cause the performance of stretching the image strip steel on the strip steel, the rolling is too loose to generate flat rolls, and meanwhile, interlayer dislocation of a cold rolling user in the uncoiling process is caused to cause fluctuation of uncoiling tension and scratch between layers of the steel coil;
referring to FIG. 2, for carbon steel, after tension is established between the drum and the finish rolling work roll F7, the tension remains constant, and when the tail of the strip leaves the finish rolling work roll F2, the drum begins to reduce the tension knowing that the tail of the strip leaves the finish rolling work roll F5;
referring to fig. 3, for high-strength steel, the winding torque required for strip steel coiling is changed with the increase of the coil diameter due to its own high hardness and strength, so that a stepwise tension control mode is adopted between the finish rolling working roll F7 and the winding drum, under which the coiling tension gradually decreases with the increase of the coil coiling diameter.
(5) The head of the strip steel enters an output track after exiting a finish rolling working roll F7, at the moment, the output track rotates at a leading speed exceeding the finish rolling working roll F7 by a certain proportion, wherein the proportion is the leading rate, after the tail of the strip steel leaves the finish rolling working roll F7, a winding drum is decelerated by 7M/M x s, the strip steel at the tail still keeps the original speed to move forwards due to inertia and then gradually decelerates, meanwhile, the tension after the tail of the strip steel leaves the finish rolling working roll F7 disappears, and the tail of the strip steel has a 'forward-flushing' trend, so that the output track adopts the later speed control at the moment, and the hysteresis rate is controlled;
lead rate and lag rate of the winding model:
1) Setting the advance rate of a coiling laminar cooling roller way at the second-stage end to be 10-25%, increasing the advance rate from 8% to 10% according to the taper trend at the first-stage end according to the set advance rate, and setting the hysteresis rate of an output roller way to be 10-20%, wherein the thicker the steel belt is, the smaller the hysteresis rate is, the thinner the steel belt is, and the larger the hysteresis rate is;
the head of the strip steel loses tension when leaving the last stand, so that the head is wrinkled, the coiling of the strip steel is affected, the speed of a G roller way is controlled to be larger than the rolling speed of the last stand, so that the forward tension is kept when the head of the strip steel enters the G roller way, the coiling is convenient, the lead rate of the G roller way is the ratio of the difference value between the speed of the G roller way and the speed of a last stand rolling machine to the speed of the last stand rolling machine, and the lead rate of a G track is as follows:
g roller way advance = fgld (Hid) (1)
Wherein Hid is the thickness of the incoming strip steel in the classification table;
fgld (): a table of the advance rate of the thickness grade G roller way;
similar to the lead rate of the G roller way, the tail part of the strip steel loses tension when leaving the tail frame, so that the tail part is wrinkled, the speed of the G roller way is controlled to be smaller than that of a tail frame rolling mill, and the tail part is continuously kept at the backward tension for coiling;
the hysteresis ratio of the G roll table refers to the ratio of the difference between the speed of the last stand rolling mill and the speed of the G roll table to the speed of the last stand rolling mill, and the formula is as follows:
g roller hysteresis = fglg (Hid) (2)
Wherein Hid is the thickness of the incoming strip steel in the classification table;
fgld: a table of hysteresis ratios for the thickness grade G roller table;
2) The lead rate of the pinch roll is 4% -15%, the lag rate is 0% -11%, the lead rate of the pinch roll is the same as the lead rate of the G roller way, the strip steel is wound in tension, the speed is also based on the speed of the last frame, and the lead rate formula of the pinch roll is as follows:
pinch roll advance = fpld (Hid) (3)
Wherein fpld is a table of advance rates for the thickness pinch rolls;
3) The advancing rate of the winding drum is 15% -20%, the advancing rate of the winding drum has the same effect as other advancing rates, and the formula is as follows:
spool advance = fmld (Hid) (4)
Wherein fmld is a table of advance rate for thickness gear reels;
4) The advance rate of the auxiliary winding roller is 15% -20%, the effect of the advance rate of the auxiliary winding roller is the same as that of other equipment, the head of the strip steel is kept in tension for winding, the speed is also based on the speed of the last frame, and the formula is as follows:
wrapper roll advance = fwld (Hid) (5)
Wherein fwld is a table of advance rates for thickness grade wrapper rolls.
The above examples are implemented on the premise of the technical scheme of the present invention, and detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the above examples. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (4)
1. The control method of the hot rolled strip steel coiling shape is characterized by comprising the following steps:
(1) The opening degree of the side guide plate is initially set to be the width of the strip steel, the allowance, the first short stroke amount and the second short stroke amount, and the opening degree of the side guide plate is adjusted according to the entering position of the head part of the strip steel;
(2) The pinch roll gap control adopts position control and pressure control;
(3) Setting the number of turns of the auxiliary winding roller to be 2-3;
(4) The winding tension is set to be 5-30N/mm 2 ；
(5) The coiling advance rate and the coiling lag rate are controlled, the advance rate of the laminar cooling roller way is 10% -25%, the lag rate of the output roller way is 10% -20%, the advance rate of the pinch roller is 4% -15%, the lag rate is 0% -11%, the advance rate of the winding drum is 15% -20%, and the advance rate of the auxiliary winding roller is 15% -20%.
2. The method according to claim 1, wherein the openings of the side guide plates are initially set to start at the time of biting of the finish rolling work roll F2, the first short stroke is performed by detecting the entry of the head of the strip into the side guide plates, the first short stroke amount/2 is simultaneously closed inward by the side guide plates, the second short stroke is performed by detecting the arrival of the head of the strip at the pinch roll, and the second short stroke amount/2 is simultaneously closed inward by the side guide plates.
3. The method according to claim 1, wherein the margin is a margin value of a side guide set by the detection data of the pattern strip, and the margin is reduced by 4 to 6mm for a side guide having a width of 1250mm or less.
4. The method according to claim 1, wherein the position control is performed before the strip is fed into the pinch rolls, the pinch roll pressure control is performed when the strip head is wound 2 to 3 turns around the reel to establish a tension signal, and the strip tail is switched back to the position control after leaving the pinch rolls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310938750.2A CN117299813A (en) | 2023-07-28 | 2023-07-28 | Control method for hot rolled strip steel coiling shape |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310938750.2A CN117299813A (en) | 2023-07-28 | 2023-07-28 | Control method for hot rolled strip steel coiling shape |
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| Publication Number | Publication Date |
|---|---|
| CN117299813A true CN117299813A (en) | 2023-12-29 |
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ID=89259287
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310938750.2A Pending CN117299813A (en) | 2023-07-28 | 2023-07-28 | Control method for hot rolled strip steel coiling shape |
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| Country | Link |
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| CN (1) | CN117299813A (en) |
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2023
- 2023-07-28 CN CN202310938750.2A patent/CN117299813A/en active Pending
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