CN113843281A - Control method for improving quality of edge of hard-rolled coil - Google Patents
Control method for improving quality of edge of hard-rolled coil Download PDFInfo
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- CN113843281A CN113843281A CN202111010846.XA CN202111010846A CN113843281A CN 113843281 A CN113843281 A CN 113843281A CN 202111010846 A CN202111010846 A CN 202111010846A CN 113843281 A CN113843281 A CN 113843281A
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 238000010008 shearing Methods 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
- 230000008569 process Effects 0.000 claims abstract description 18
- 238000009826 distribution Methods 0.000 claims abstract description 13
- 238000009966 trimming Methods 0.000 claims abstract description 8
- 238000005096 rolling process Methods 0.000 claims description 61
- 238000005520 cutting process Methods 0.000 claims description 14
- 238000003466 welding Methods 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 4
- 238000005097 cold rolling Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 description 7
- 238000001816 cooling Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
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Classifications
-
- 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
- B21B15/0007—Cutting or shearing the product
-
- 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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/38—Control of flatness or profile during rolling of strip, sheets or plates using roll bending
-
- 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
- B21B37/48—Tension control; Compression control
-
- 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
- B21B37/58—Roll-force control; Roll-gap control
-
- 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
- B21B15/0007—Cutting or shearing the product
- B21B2015/0021—Cutting or shearing the product in the rolling direction
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- Engineering & Computer Science (AREA)
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Abstract
The invention provides a control method for improving the quality of a hard-rolled hemmed part, which relates to the field of cold rolling and trimming, and is characterized in that the clearance amount and the overlapping amount of a circle shear are controlled, the parameter control directly influences the distribution of a deformation area, a shearing area and a tearing area in the shearing process, the edge part crack can be caused due to the uneven tearing area, the shearing area is adjusted to 1/6 from 1/4 of the thickness of strip steel through adjusting the clearance amount and the overlapping amount, the axial angle is increased, the friction force between the shearing edge and the surface of the strip steel is reduced in the shearing process, the previous 15m/min is increased to 30m/min through increasing the seam crossing speed of the circle shear, the tearing speed is increased, the flatness of the tearing area is improved, the speed increasing speed is controlled to 10m/min by adopting a method of increasing the speed for many times, the flatness of the tearing area is not high due to reducing the over-increasing speed, the quality of the cut edge is improved.
Description
Technical Field
The invention relates to the technical field of cold rolling and trimming, in particular to a control method for improving the quality of a hard-rolled edge part.
Background
At present, in the cold rolling production process, the quality of the edge part has great influence on the production of a downstream continuous unit, the hidden danger of strip breakage in a furnace is increased for a subsequent continuous annealing unit, and the strip steel with edge cracks can be bent and deformed back and forth through a furnace roller under the action of tension in the continuous expansion annealing process of the crack, so that the strip breakage in the furnace is caused.
Because the edge of the cold-rolled base material hot-rolled coil is thinned in the rolling process, the cooling speed of the edge is high in the cooling process, the quality of the edge is loose or brittle, and the disc shear is widely applied as a key device for cutting off the edge defects of the strip steel and ensuring the width precision. With the diversified development of the cold rolling market, the edge cutting process mainly presents two main directions of steel variety diversification and edge quality beautification, and the parameters of the disc shearing edge process are required to be suitable for different steel types, and the parameters are adjusted to ensure the edge quality.
According to the current tracking condition, the defect mainly occurs within 30 circles of the head and the tail of a hard rolling coil, particularly within about 20m of the core of the hard rolling coil, namely the outer ring of the hot rolling coil, the partial area belongs to the position of hot rolling tension loss, the width is changed, camber is easy to occur, the cooling is fast, the material is easy to be brittle, and poor trimming is easy to occur.
Meanwhile, the head and the tail of the cold-hard roll need to be rolled at a reduced speed due to welding seams, in order to avoid the need of breaking a strip and ensuring the stable rolling of the strip steel due to overlarge rolling force of each stand during the reduction of the speed, additional tension is added during the period, the total tension often acts on the strip steel, 30-50KN is increased compared with the normal rolling process, and under the action of high tension, trimming flaws and rolling cracked edges are easily amplified, so that cracks appear at the edge of the rolled hard roll.
To sum up, the problem of collapsing sword and side cut flaw is difficult to overcome to present widely used clearance volume overlap quantity interlock formula circle shear, and additional tension effect lower extreme rolling defect and side cut defect enlarge specifically to be: the steel strength range aimed at by the gap amount overlapping amount adjusting curve is fixed, and when the local performance of the steel plate is unstable or the steel grade exceeding the limit range appears, the problem of poor trimming appears; the clearance overlap amount linkage type disc shear can solve the problem that the effect is poor in practice by adjusting the clearance overlap amount appropriately in principle when the shear blade is slightly worn; the additional tension is not matched with the rolling force, so that the rolling force of individual frames is overlarge, and the quality problem of edges is caused; the plate shape control characteristic is also an important factor influencing the edge quality, so the invention provides a control method for improving the edge quality of the hard rolled edge.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a novel method for matching a rotary shear process, additional tension allocation among racks and plate shape control, aiming at solving or reducing the problem of edge cracking of a hard rolling edge, and providing new insights in the aspects of shear parameter adjustment, plate shape control, additional tension adjustment and the like to achieve the aim of solving the problem, wherein the proportion of the edge cracking defect after the adjustment is reduced from 16% to 5% before the adjustment, and the remaining edge defects are all caused by the defects of raw materials.
In order to achieve the purpose, the invention adopts the following technical scheme: a control method for improving the quality of a hard rolling edge part comprises the following specific steps:
s1, controlling the clearance and the overlapping amount of the disc shear and controlling the axial angle, wherein the parameter control directly influences the distribution of a deformation area, a shearing area and a tearing area in the shearing process, the tearing area is uneven to cause edge cracks, the shearing area is adjusted to 1/6 from 1/4 of the thickness of the strip steel through adjusting the clearance and the overlapping amount, the axial angle is increased, and the friction force between the shearing edge and the surface of the strip steel in the shearing process is reduced.
And S2, re-checking the shearing kilometer number, and generating forced tearing due to the fact that the shearing edge is over-fatigue to the end cutting edge, so that the junction of the cutting area and the tearing area is not smooth, and the rolled edge is cracked.
S3, rolling force of a rolling mill and additional tension are matched, rolling is carried out in a 5-stand flattening mode, rolling is mainly carried out by means of rolling of a front 4 stand, deformation is distributed to 3 stands and 4 stands more before being adjusted by taking thin strip steel with the thickness of less than 0.5mm as an example, the strip steel in the area is thinner, the distribution deformation is larger than that of a welding seam in the process of reducing the speed, rolling edge cracks are easily caused due to increase of the rolling force acting on the strip steel in a slow speed, the deformation distribution is adjusted to be 53%, 50%, 34% and 26% from 45%, 50%, 43% and 47%, and the additional tension is adjusted to be 40kn between 1-2 stands, 45kn between 2-3 stands, 45kn between 3-4 stands and 35kn between 4-5 stands from 36kn between 1-2 stands, 45kn between 2-3 stands, 40kn between 3-4 stands and 40kn between 4-5 stands.
And S4, adopting micro-moderate wave control in the rolling process, reducing the edge acting force in the steel plate rolling process, and controlling the positive bending of the roller.
In a preferred embodiment, the rolling mill used in the step S3 is a 5-stand 6-roll mill.
As a preferred embodiment, in step S1, the previous disk shear over-weld speed is increased from 15m/min to 30m/min to accelerate the tearing speed and improve the flatness of the torn area, and a multiple-speed-increasing method is adopted to control the speed-increasing rate at 10m/min, and the reduction of the speed-increasing rate leads to low flatness of the torn area, thereby improving the quality of the cut edge.
As a preferred embodiment, the main purpose of changing the distribution of the deformation amount in step S3 is to control the deviation of the roll force setting value of each stand from the actual value within 1MN, so as to reduce the rolling edge crack caused by the roll force fluctuation due to special reasons.
In a preferred embodiment, in step S2, the cutting edge is forcibly replaced when the number of cutting kilometers is controlled to 450 km.
Compared with the prior art, the invention has the advantages and positive effects that,
1. the invention relates to control of clearance and overlap of a circle shear and control of axial angle, wherein the parameter control directly influences the distribution of a deformation zone, a shearing zone and a tearing zone in the shearing process, edge cracks can appear due to the fact that the tearing zone is not flat, the shearing zone is adjusted to 1/6 from 1/4 of the thickness of strip steel through adjustment of the clearance and the overlap, the axial angle is increased, the friction force between a shearing edge and the surface of the strip steel in the shearing process is reduced, the tearing speed is increased to 30m/min from the previous 15m/min through increasing the over-welding speed of the circle shear, the flatness of the tearing zone is improved, the speed increasing speed is controlled to 10m/min through adopting a multi-time speed increasing method, the flatness of the tearing zone is not high due to the fact that the speed is increased too fast, and the trimming quality is improved.
2. The rolling mill is a 5-stand 6-roll rolling mill, rolling is carried out by adopting a 5-stand flattening mode, rolling is mainly carried out by pressing down by a front 4-stand, the amount of deformation before adjusting is more distributed to 3 stands and 4 stands by taking a thin strip steel with the thickness of less than 0.5mm as an example, the strip steel in the area is thinner, the distributed amount of deformation is larger than that in the process of reducing the speed of a welding seam, the rolling edge crack is easily caused by the increase of the rolling force acting on the strip steel due to the slow speed, the amount of deformation is adjusted to be 53%, 50%, 34% and 26% from 45%, 50%, 43% and 47%, the additional tension is adjusted to be 40kn between 1-2 stands, 45kn between 3-4 stands, 40kn between 2-3 stands, 40kn between 3-4 stands, 35kn between 4-5 stands, the additional tension adjustment mainly aims at controlling the deviation of the set value and the actual value of the rolling force of each stand within 1MN, so that the rolling edge crack caused by rolling force fluctuation due to special reasons is reduced.
3. The number of sheared kilometers is rechecked, forced tearing is generated due to over fatigue of a cutting edge of a shear blade, the junction of a cutting area and a tearing area is not smooth, rolled edge cracking is caused, forced replacement is controlled at 450km at present, and the influence on machining due to over fatigue of the shear blade is avoided.
4. The method adopts micro-Zhongunres control, adopts micro-Zhongunres control in the rolling process, reduces the acting force of the edge part in the steel plate rolling process, and controls the positive bending of the roller.
Drawings
FIG. 1 is a graph of tuning data embodying the present invention;
FIG. 2 is a schematic diagram of the present invention showing specific shearing.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
The invention provides a technical scheme that: a control method for improving the quality of a hard rolled hemmed part, S1, control of the clearance and the overlapping amount of a circle shear and shaft angle control, the parameter control directly influences the distribution of a deformation area, a shearing area and a tearing area in the shearing process, the tearing area is uneven to cause edge cracks, the clearance amount and the overlapping amount are adjusted, the shearing area is adjusted to 1/6 from 1/4 of the thickness of the strip steel, the axial angle is increased, the friction force between the shearing edge and the surface of the strip steel is reduced in the shearing process, the speed of the disk shear over-welding seam is increased to 30m/min, the tearing speed is increased, the flatness of a torn area is improved, the speed increasing speed is controlled to 10m/min by adopting a multi-time speed increasing method, the flatness of the torn area is not high due to the fact that the speed is increased too fast is reduced, the trimming quality is improved, and the specific adjustment data are shown in figure 1;
s2, re-checking the shearing kilometer number, and forcibly tearing due to the fact that the shearing edge is over-fatigue to the end cutting edge to cause unsmooth junction between the cutting area and the tearing area and rolling edge crack, wherein the current situation is controlled to be forcibly replaced at 450km, and a specific shearing schematic diagram is shown in figure 2;
s3, the rolling force of the rolling mill and the additional tension, wherein the rolling mill is a 5-stand 6-roll rolling mill, the rolling mill adopts a 5-stand flattening mode, the rolling mill is mainly pressed by a front 4-stand, the front deformation of a thin strip steel with the thickness of less than 0.5mm is adjusted to be more distributed to 3 stands and 4 stands, the strip steel in the region is thinner, the distribution deformation is larger, the rolling edge crack is easily caused by the increase of the rolling force acting on the strip steel due to the slow speed in the process of reducing the speed of a welding seam, the deformation distribution is adjusted to be 53%, 50%, 34% and 26% from 45%, 50%, 43% and 47%, the additional tension is adjusted to be 40kn between 1-2 stands, 45kn between 3-4 stands, 40kn between 2-3 stands, 40kn between 3-4 stands, and 35kn between 4-5 stands, the additional tension adjustment mainly aims at controlling the deviation between the set value and the actual value of the rolling force of each stand within 1MN, so that rolling edge cracks caused by rolling force fluctuation due to special reasons are reduced, and other specifications are adjusted as shown in the table.
Rolling force and additional tension matching meter
And S4, adopting micro-moderate wave control in the rolling process, reducing the edge acting force in the steel plate rolling process, and controlling the positive bending of the roller.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes by using the technical contents disclosed in the above description to other fields, but any simple modification, equivalent change and change made to the above embodiments according to the technical essence of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (5)
1. A control method for improving the quality of a rolled and hard curled portion is characterized by comprising the following specific steps:
s1, controlling the clearance and the overlapping amount of the disc shear and controlling the axial angle, wherein the parameter control directly influences the distribution of a deformation area, a shearing area and a tearing area in the shearing process, the tearing area is uneven to cause edge cracks, the shearing area is adjusted to 1/6 from 1/4 of the thickness of the strip steel through adjusting the clearance and the overlapping amount, the axial angle is increased, and the friction force between the shearing edge and the surface of the strip steel in the shearing process is reduced.
And S2, re-checking the shearing kilometer number, and generating forced tearing due to the fact that the shearing edge is over-fatigue to the end cutting edge, so that the junction of the cutting area and the tearing area is not smooth, and the rolled edge is cracked.
S3, rolling force of a rolling mill and additional tension are matched, rolling is carried out in a 5-stand flattening mode, rolling is mainly carried out by means of rolling of a front 4 stand, deformation is distributed to 3 stands and 4 stands more before being adjusted by taking thin strip steel with the thickness of less than 0.5mm as an example, the strip steel in the area is thinner, the distribution deformation is larger than that of a welding seam in the process of reducing the speed, rolling edge cracks are easily caused due to increase of the rolling force acting on the strip steel in a slow speed, the deformation distribution is adjusted to be 53%, 50%, 34% and 26% from 45%, 50%, 43% and 47%, and the additional tension is adjusted to be 40kn between 1-2 stands, 45kn between 2-3 stands, 45kn between 3-4 stands and 35kn between 4-5 stands from 36kn between 1-2 stands, 45kn between 2-3 stands, 40kn between 3-4 stands and 40kn between 4-5 stands.
And S4, adopting micro-moderate wave control in the rolling process, reducing the edge acting force in the steel plate rolling process, and controlling the positive bending of the roller.
2. A control method for improving the quality of a hard rolled hem according to claim 1, wherein: in the step S3, the rolling machine is a 5-stand 6-roll rolling machine.
3. A control method for improving the quality of a hard rolled hem according to claim 1, wherein: in the step S1, the previous disk shear over-weld speed is increased from 15m/min to 30m/min to accelerate the tearing speed and improve the flatness of the torn area, and a multi-speed-increasing method is adopted to control the speed-increasing rate to 10m/min, reduce the speed-increasing rate too fast to cause the flatness of the torn area not to be high, and improve the trimming quality.
4. A control method for improving the quality of a hard rolled hem according to claim 1, wherein: the main purpose of changing the distribution of the deformation amount in the step S3 is to control the deviation of the roll force set value and the actual value of each stand within 1MN, so as to reduce the rolling edge crack caused by the roll force fluctuation due to special reasons.
5. A control method for improving the quality of a hard rolled hem according to claim 1, wherein: in the step S2, the cutting edge is forcibly replaced when the number of cutting kilometers is controlled to 450 km.
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| CN202111010846.XA CN113843281A (en) | 2021-08-31 | 2021-08-31 | Control method for improving quality of edge of hard-rolled coil |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114807529A (en) * | 2022-05-06 | 2022-07-29 | 天津市新天钢冷轧薄板有限公司 | Process for reducing risk of producing SPCC (SpcC (spray cooled continuous casting) material by continuous annealing furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114807529A (en) * | 2022-05-06 | 2022-07-29 | 天津市新天钢冷轧薄板有限公司 | Process for reducing risk of producing SPCC (SpcC (spray cooled continuous casting) material by continuous annealing furnace |
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