CN111451291A - Method for improving coil shape quality of hot-rolled strip steel - Google Patents
Method for improving coil shape quality of hot-rolled strip steel Download PDFInfo
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- CN111451291A CN111451291A CN202010269399.9A CN202010269399A CN111451291A CN 111451291 A CN111451291 A CN 111451291A CN 202010269399 A CN202010269399 A CN 202010269399A CN 111451291 A CN111451291 A CN 111451291A
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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
- 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
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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
- B21C47/02—Winding-up or coiling
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- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
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Abstract
The invention relates to a method for improving the coil quality of hot-rolled strip steel, wherein the tail stop state is set after 21-36 seconds of delay after the head of a coiler bites steel, and when the tail of the strip steel is detected to leave a pinch roll after the tail throws the steel, the tail automatic stop control starts, and a winding drum stops according to a deceleration curve; when the tail of the strip steel enters a determined range from a starting stop position, determining a tail stop position point according to a tail-to-tail conversion time sequence, and correspondingly delaying coil stripping time in a coiling machine after normal coiling is finished; the advantages are that: the invention introduces the pre-judgment of the tail-to-tail position after the coiling machine at the head of the hot rolled strip bites the steel and the calculation and judgment of the automatic rotation angle after the contraposition delay, and can selectively determine the final coil stripping position point according to the operation requirement, thereby improving the coil shape quality of the hot rolled strip, and reducing the probability of coil flattening caused by the abrasion of a winding drum, insufficient tension, insufficient cooling water capacity and large roll gap deviation of a wrapper roll.
Description
Technical Field
The invention relates to a method for improving the coil shape quality of hot-rolled strip steel.
Background
Advanced high-strength steel plates produced by hot rolling and hot-rolled steel plates with special uses require high impact property, crushing strength, fatigue property, cold bending property and the like; besides the good mechanical properties and forming properties, the steel plate also has good welding performance, spot welding performance, corrosion resistance, aging stability, performance uniformity and stability, and good damping performance. However, these steels have a general problem in the production process: flat rolls, typical varieties are: automobile steel, weather-resistant steel, military steel, cutting tool steel and dual-phase steel. In the production process, because in the coiling procedure of the coiling machine, the steel plate winding drum with the thickness less than 6 millimeters has the reverse function when the steel plate is uncoiled, in order to prevent the easy flat coil steel type from being drawn out, when the tail part stops at the left and right positions of a 5 o' clock pointer after coiling, because the transverse diameter of the coil diameter of the flat coil steel type is greater than the longitudinal diameter of the coil diameter, when the coil unloading trolley supports the steel coil to leave the coiling machine, the steel coil is often found to collide the winding drum due to the contact friction force in the moment to generate reverse sliding, so that the tail end of the steel coil is clamped in a north side frame of the coiling machine, and the normal production work of the. In the flat-rolled steel grade, the flat-rolling degree has obvious correlation with a coiler, and compared with the steel rolled by a winding drum, the steel rolled by the winding drum is not tight enough, and the reason of causing the flat rolling is suspected to be that the steel rolled by the winding drum is not tight enough. In order to ensure that the drum is tight enough when the steel is coiled, the secondary expansion position of the loaded drum needs to be obviously smaller than that of the unloaded drum, but the secondary expansion position is limited by the structure of the equipment and cannot be realized by increasing the secondary expansion stroke directly. Meanwhile, due to abrasion of a coiler drum, the expansion and contraction quantity in the coiling process at the middle and later stages cannot meet the requirement, and the accuracy of the key part can be selectively recovered according to the relative slip influence degree. Therefore, optimization is required in terms of process and control timing.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for improving the coiling quality of hot-rolled strip steel, tail control points are added in coiling machines of all frames, meanwhile, a section of coil unloading delay is added at the tail point position after a pinch roll throws steel, the influence caused by tension control lag and reel abrasion is compensated, meanwhile, judgment of automatic rotation of the coiling machines is introduced, the coiling quality of the hot-rolled strip steel is improved, the unevenness and flat coil occurrence rate of the strip steel are reduced, and the production efficiency is improved.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method of improving the coil quality of hot rolled steel strip comprising:
1) calculation of position of tail point of strip steel tail parking position
Delaying for 21-36 seconds after the head of the recoiling machine bites steel, starting to set a tail stop state, after the tail throws steel, when the tail of the strip steel is detected to leave a pinch roll, starting tail automatic stop control, and stopping a winding drum according to a deceleration curve;
a) delaying 30 seconds after the pinch roll of the 1# coiler bites steel, starting to calculate the position of a tail aligning point, finishing calculation after the F7 rack throws steel, setting a tail aligning program while throwing, starting a rotation control program of the 1# coiler after the steel coil stops rotating and stays in the coiler for 50 seconds, and directly executing the position of the tail aligning point according to the program setting;
b) after the pinch roll of the 2# coiler bites steel, the position of the tail end alignment position begins to be calculated after delaying 35 seconds, the calculation is completed after the F7 machine frame throws steel, the tail end alignment program is set when the steel coil is put into use, after the steel coil stops rotating, the rotation control program of the 2# coiler is started after the steel coil stays in the coiler for 50 seconds, and the position of the tail end alignment position is directly executed according to the program setting;
c) delaying 40 seconds after the pinch roll of the 3# coiler bites steel, starting to calculate the position of a tail aligning point, finishing calculation after the F7 rack throws steel, setting a tail aligning program while throwing, starting a rotation control program of the 3# coiler after the steel coil stops rotating and stays in the coiler for 60 seconds, and directly executing the position of the tail aligning point according to the program setting;
2) determining an actual coil stripping location point according to the calculated position of the tail point
When the tail of the strip steel enters a determined range from a starting stop position, determining a tail stop position point according to a tail-to-tail conversion time sequence, and correspondingly delaying coil stripping time in a coiling machine after normal coiling is finished;
a) after the coiling machine stops rotating, the coiling machine delays for 50-120 seconds and then unloads coils, even if the deformation resistance of the strip steel is uniform after the phase change in the coiling machine is completed in a temperature region, and the coils are unloaded after the friction force between coil layers is uniform;
b) and during coil unloading, the coil is unloaded after the coil is rotated forwards by 80-95 degrees in the coiling machine.
Calculating the position of the tail end point of the parking position of the tail part of the strip steel in the step 1):
a＝θA－θX (1)
θX＝sin-1[(Dm－Dp)/2Ld]＝(Dm－Dp)×180/(2πLd)[DEG](2)
Lc＝LdCOSθX＝Ld(1-sin2θX)1/2＝Ld×(1-θX2)1/2
＝Ld×(1-θX2/2)＝Ld×[1-(Dm－Dp)/8(Ld)](3)
Lx＝Dp×a/2 (4)
Ltotal＝Lb+Lx+Lc(5)
θtotal＝[2Ltotal/Dm+θs-a]×180°/π (6)
in the formula (1) -formula (6), theta A is an included angle between a rolling line and a connecting line of a lower pinch roll and a winding drum in unit of degree, theta X is an included angle between L c and L d in unit of degree, L b is a distance from a hot metal detector HMD to the lower pinch roll in unit of mm, L c is a length from a strip steel to the strip steel in unit of mm, theta s is a tail parking target position, Dm is a diameter of the strip steel in unit of mm, Dp is a diameter of the lower pinch roll in unit of mm, theta total is a total rotating angle of the remaining length in unit of degree, L d is a distance from the lower pinch roll to a winding drum axis in unit of mm, DEG is an angle in unit of mm, and a is a parking angle in unit of degree.
In step 2) b):
if the vehicle stops at the 2 o 'clock position, the vehicle rotates forwards by 90 degrees to the 5 o' clock position to unload the coil from the tail;
if the vehicle stops at the 5 o 'clock position, the vehicle rotates forwards and rotates 450 degrees to the 7 o' clock position to unload the coil from the tail;
if the vehicle stops at the 7 o 'clock position, the vehicle rotates in the forward direction by 270 degrees to the 5 o' clock position to unload the coil from the tail.
Compared with the prior art, the invention has the beneficial effects that:
the invention introduces the pre-judgment of the tail-to-tail position and the calculation judgment of the automatic rotation angle after the contraposition delay after biting the steel by the coiling machine at the head of the strip steel, and can selectively determine the final coil stripping position point according to the operation requirement, thereby improving the shape quality of the hot-rolled strip steel coil, reducing the probability of occurrence of flat coils caused by abrasion of a coiling drum, insufficient tension, insufficient cooling water capacity and large roll gap deviation of a wrapper roll, avoiding the influence on the shape of the strip steel coil, avoiding defective products of plate shape unevenness caused by the occurrence of the flat coils, improving the quality of the coil shape and the plate shape, greatly reducing the accident time and improving the production efficiency.
Drawings
FIG. 1 is a schematic diagram of rotation timing parameters.
In the drawing, a is a stopping angle in unit of degree, Dm is the diameter of a steel coil in unit of mm, theta s is a tail stopping target position in unit of degree, theta A is an included angle between a rolling line and a connecting line of a lower pinch roll and a winding drum in unit of degree, L d is a distance between the lower pinch roll and a winding drum axis in unit of mm, theta X is an included angle between L c and L d in unit of degree, L b is a distance between a hot metal detector and the lower pinch roll in unit of mm, Dp is the diameter of the lower pinch roll in unit of mm, and L c is a length between the lower pinch roll and the steel coil in unit of mm.
Detailed Description
The present invention is described in detail below, but it should be noted that the practice of the present invention is not limited to the following embodiments.
A method of improving the coil quality of hot rolled steel strip comprising:
1) calculation of position of tail point of strip steel tail parking position
Delaying for 21-36 seconds after the head of the recoiling machine bites steel, starting to set a tail stop state, after the tail throws steel, when the tail of the strip steel is detected to leave a pinch roll, starting tail automatic stop control, and stopping a winding drum according to a deceleration curve;
a) delaying 21-36 seconds after the pinch roll of the 1# coiler bites steel, starting to calculate the position of a tail aligning point, finishing calculation after the F7 rack throws steel, setting a tail program while throwing, starting a 1# coiler rotation control program after the steel coil stops rotating and stays in the coiler for 26-53 seconds, and directly executing the tail aligning point according to the program setting;
b) delaying 23-38 seconds after the pinch roll of the 2# coiler bites steel, starting to calculate the position of a tail aligning point, finishing calculation after the F7 rack throws steel, setting a tail aligning program while throwing, starting a 2# coiler rotation control program after the steel coil stops rotating and stays in the coiler for 28-56 seconds, and directly executing the tail aligning position according to the program setting;
c) delaying 23-46 seconds after the pinch roll of the 3# coiler bites steel, starting to calculate the position of the tail end point, finishing calculation after the F7 rack throws steel, setting a tail program while throwing, starting a rotation control program of the 3# coiler after the steel coil stops rotating and stays in the coiler for 38-61 seconds, and directly executing the position of the tail end point according to the program setting;
2) determining an actual coil stripping location point according to the calculated position of the tail point
When the tail of the strip steel enters a determined range from a starting stop position, determining a tail stop position point according to a tail-to-tail conversion time sequence, and correspondingly delaying coil stripping time in a coiling machine after normal coiling is finished;
a) after the coiling machine stops rotating, the coiling machine delays for 50-120 seconds and then unloads coils, even if the deformation resistance of the strip steel is uniform after the phase change in the coiling machine is completed in a temperature region, and the coils are unloaded after the friction force between coil layers is uniform;
b) when in coil unloading, the coil is unloaded after rotating forward 80-95 degrees in the coiling machine:
if the vehicle stops at the 2 o 'clock position, the vehicle rotates forwards by 90 degrees to the 5 o' clock position to unload the coil from the tail;
if the vehicle stops at the 5 o 'clock position, the vehicle rotates forwards and rotates 450 degrees to the 7 o' clock position to unload the coil from the tail;
if the vehicle stops at the 7 o 'clock position, the vehicle rotates in the forward direction by 270 degrees to the 5 o' clock position to unload the coil from the tail.
Calculating the position of the tail end point of the parking position of the tail part of the strip steel in the step 1):
a＝θA－θX (1)
θX＝sin-1[(Dm－Dp)/2Ld]＝(Dm－Dp)×180/(2πLd)[DEG](2)
Lc＝LdCOSθX＝Ld(1-sin2θX)1/2＝Ld×(1-θX2)1/2
＝Ld×(1-θX2/2)＝Ld×[1-(Dm－Dp)/8(Ld)](3)
Lx＝Dp×a/2 (4)
Ltotal＝Lb+Lx+Lc (5)
θtotal＝[2Ltotal/Dm+θs-a]×180°/π (6)
in the formula (1) -formula (6), theta A is an included angle between a rolling line and a connecting line of a lower pinch roll and a winding drum in unit of degree, theta X is an included angle between L c and L d in unit of degree, L b is a distance from a hot metal detector HMD to the lower pinch roll in unit of mm, L c is a length from a strip steel to the strip steel in unit of mm, theta s is a tail parking target position, Dm is a diameter of the strip steel in unit of mm, Dp is a diameter of the lower pinch roll in unit of mm, theta total is a total rotating angle of the remaining length in unit of degree, L d is a distance from the lower pinch roll to a winding drum axis in unit of mm, DEG is an angle in unit of mm, and a is a parking angle in unit of degree.
Claims (3)
1. A method for improving the coil shape quality of hot rolled strip steel is characterized by comprising the following steps:
1) calculation of position of tail point of strip steel tail parking position
Delaying for 21-36 seconds after the head of the recoiling machine bites steel, starting to set a tail stop state, after the tail throws steel, when the tail of the strip steel is detected to leave a pinch roll, starting tail automatic stop control, and stopping a winding drum according to a deceleration curve;
a) delaying 30 seconds after the pinch roll of the 1# coiler bites steel, starting to calculate the position of a tail aligning point, finishing calculation after the F7 rack throws steel, setting a tail aligning program while throwing, starting a rotation control program of the 1# coiler after the steel coil stops rotating and stays in the coiler for 50 seconds, and directly executing the position of the tail aligning point according to the program setting;
b) after the pinch roll of the 2# coiler bites steel, the position of the tail end alignment position begins to be calculated after delaying 35 seconds, the calculation is completed after the F7 machine frame throws steel, the tail end alignment program is set when the steel coil is put into use, after the steel coil stops rotating, the rotation control program of the 2# coiler is started after the steel coil stays in the coiler for 50 seconds, and the position of the tail end alignment position is directly executed according to the program setting;
c) delaying 40 seconds after the pinch roll of the 3# coiler bites steel, starting to calculate the position of a tail aligning point, finishing calculation after the F7 rack throws steel, setting a tail aligning program while throwing, starting a rotation control program of the 3# coiler after the steel coil stops rotating and stays in the coiler for 60 seconds, and directly executing the position of the tail aligning point according to the program setting;
2) determining an actual coil stripping location point according to the calculated position of the tail point
When the tail of the strip steel enters a determined range from a starting stop position, determining a tail stop position point according to a tail-to-tail conversion time sequence, and correspondingly delaying coil stripping time in a coiling machine after normal coiling is finished;
a) after the coiling machine stops rotating, the coiling machine delays for 50-120 seconds and then unloads coils, even if the deformation resistance of the strip steel is uniform after the phase change in the coiling machine is completed in a temperature region, and the coils are unloaded after the friction force between coil layers is uniform;
b) and during coil unloading, the coil is unloaded after the coil is rotated forwards by 80-95 degrees in the coiling machine.
2. The method for improving the coil quality of the hot-rolled strip steel according to claim 1, wherein the tail position of the strip steel tail parking position in the step 1) is calculated by the following steps:
a＝θA－θX (1)
θX＝sin-1[(Dm－Dp)/2Ld]＝(Dm－Dp)×180/(2πLd)[DEG](2)
Lc＝LdCOSθX＝Ld(1-sin2θX)1/2＝Ld×(1-θX2)1/2
＝Ld×(1-θX2/2)＝Ld×[1-(Dm－Dp)/8(Ld)](3)
Lx＝Dp×a/2 (4)
Ltotal＝Lb+Lx+Lc (5)
θtotal＝[2Ltotal/Dm+θs-a]×180°/π (6)
in the formula (1) -formula (6), theta A is an included angle between a rolling line and a connecting line of a lower pinch roll and a winding drum in unit of degree, theta X is an included angle between L c and L d in unit of degree, L b is a distance from a hot metal detector HMD to the lower pinch roll in unit of mm, L c is a length from a strip steel to the strip steel in unit of mm, theta s is a tail parking target position, Dm is a diameter of the strip steel in unit of mm, Dp is a diameter of the lower pinch roll in unit of mm, theta total is a total rotating angle of the remaining length in unit of degree, L d is a distance from the lower pinch roll to a winding drum axis in unit of mm, DEG is an angle in unit of mm, and a is a parking angle in unit of degree.
3. The method of claim 1, wherein in step 2) b):
if the vehicle stops at the 2 o 'clock position, the vehicle rotates forwards by 90 degrees to the 5 o' clock position to unload the coil from the tail;
if the vehicle stops at the 5 o 'clock position, the vehicle rotates forwards and rotates 450 degrees to the 7 o' clock position to unload the coil from the tail;
if the vehicle stops at the 7 o 'clock position, the vehicle rotates in the forward direction by 270 degrees to the 5 o' clock position to unload the coil from the tail.
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Cited By (9)
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| CN111922092A (en) * | 2020-08-11 | 2020-11-13 | 洛阳万基铝加工有限公司 | Control method of ironing roller device |
| CN111981992A (en) * | 2020-07-31 | 2020-11-24 | 唐山钢铁集团微尔自动化有限公司 | Steel coil diameter calculation method |
| CN112845608A (en) * | 2020-12-02 | 2021-05-28 | 邯郸钢铁集团有限责任公司 | Method for judging wear degree of drying roller in acid washing |
| CN113305176A (en) * | 2021-04-30 | 2021-08-27 | 首钢京唐钢铁联合有限责任公司 | Strip steel coiling method, device, equipment and storage medium |
| CN113305177A (en) * | 2021-05-12 | 2021-08-27 | 首钢京唐钢铁联合有限责任公司 | Coiling machine, method and device for clearing tracking information of plate coil of coiling machine and storage medium |
| CN114480804A (en) * | 2021-12-09 | 2022-05-13 | 鞍钢股份有限公司 | Method for controlling flat rolling of cold-rolled dual-phase steel |
| CN114535353A (en) * | 2022-03-17 | 2022-05-27 | 山东钢铁集团日照有限公司 | Safe coil unloading method for hot rolling coiler |
| CN114833199A (en) * | 2021-10-14 | 2022-08-02 | 天津市新宇彩板有限公司 | Control method and control system for tail flicking of right side of strip steel of acid continuous rolling unit |
| CN115283451A (en) * | 2022-08-31 | 2022-11-04 | 鞍钢股份有限公司 | Method for improving precision of pinch roll of hot rolling coiler |
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| CN111981992B (en) * | 2020-07-31 | 2022-05-27 | 唐山钢铁集团微尔自动化有限公司 | Steel coil diameter calculation method |
| CN111981992A (en) * | 2020-07-31 | 2020-11-24 | 唐山钢铁集团微尔自动化有限公司 | Steel coil diameter calculation method |
| CN111922092A (en) * | 2020-08-11 | 2020-11-13 | 洛阳万基铝加工有限公司 | Control method of ironing roller device |
| CN112845608A (en) * | 2020-12-02 | 2021-05-28 | 邯郸钢铁集团有限责任公司 | Method for judging wear degree of drying roller in acid washing |
| CN113305176A (en) * | 2021-04-30 | 2021-08-27 | 首钢京唐钢铁联合有限责任公司 | Strip steel coiling method, device, equipment and storage medium |
| CN113305176B (en) * | 2021-04-30 | 2023-02-03 | 首钢京唐钢铁联合有限责任公司 | Strip steel coiling method, device, equipment and storage medium |
| CN113305177A (en) * | 2021-05-12 | 2021-08-27 | 首钢京唐钢铁联合有限责任公司 | Coiling machine, method and device for clearing tracking information of plate coil of coiling machine and storage medium |
| CN114833199A (en) * | 2021-10-14 | 2022-08-02 | 天津市新宇彩板有限公司 | Control method and control system for tail flicking of right side of strip steel of acid continuous rolling unit |
| CN114833199B (en) * | 2021-10-14 | 2024-02-06 | 天津市新宇彩板有限公司 | Control method and control system for tail flicking of right side of strip steel of acid tandem rolling unit |
| CN114480804A (en) * | 2021-12-09 | 2022-05-13 | 鞍钢股份有限公司 | Method for controlling flat rolling of cold-rolled dual-phase steel |
| CN114535353A (en) * | 2022-03-17 | 2022-05-27 | 山东钢铁集团日照有限公司 | Safe coil unloading method for hot rolling coiler |
| CN115283451A (en) * | 2022-08-31 | 2022-11-04 | 鞍钢股份有限公司 | Method for improving precision of pinch roll of hot rolling coiler |
| CN115283451B (en) * | 2022-08-31 | 2024-05-14 | 鞍钢股份有限公司 | Method for improving precision of pinch roll of hot rolling coiling machine |
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