CN114798753B - Automatic rolling method for weak-strength weld joint of continuous rolling mill - Google Patents
Automatic rolling method for weak-strength weld joint of continuous rolling mill Download PDFInfo
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- CN114798753B CN114798753B CN202210424481.3A CN202210424481A CN114798753B CN 114798753 B CN114798753 B CN 114798753B CN 202210424481 A CN202210424481 A CN 202210424481A CN 114798753 B CN114798753 B CN 114798753B
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- 238000005096 rolling process Methods 0.000 title claims abstract description 220
- 238000000034 method Methods 0.000 title claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 161
- 239000010959 steel Substances 0.000 claims abstract description 161
- 238000003466 welding Methods 0.000 claims abstract description 136
- 238000003825 pressing Methods 0.000 claims abstract description 24
- 238000010008 shearing Methods 0.000 claims description 57
- 238000009826 distribution Methods 0.000 claims description 17
- 230000009467 reduction Effects 0.000 claims description 16
- 238000005520 cutting process Methods 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 description 9
- 239000013072 incoming material Substances 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 5
- 230000000881 depressing effect Effects 0.000 description 5
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 241001391944 Commicarpus scandens Species 0.000 description 1
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- 230000003111 delayed effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
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- 230000033764 rhythmic process Effects 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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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
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
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Abstract
The invention discloses an automatic rolling method of a weak-strength welding seam of a continuous rolling mill, which comprises a continuous rolling mill basic automatic system, wherein the continuous rolling mill basic automatic system is connected with a pressing automatic controller, welding seam strength identification information comprising a welding seam strength classification preset value and an overwelding seam finished product target thickness addition amount set according to the welding seam strength classification preset value is set through the continuous rolling mill basic automatic system, a welding seam automatic tracker used for detecting a strip steel welding seam is arranged at an inlet of the continuous rolling mill, when the welding seam automatic tracker detects the strip steel welding seam, a welding seam signal is sent to the pressing automatic controller, and the pressing automatic controller is combined with welding seam strength identification information of the basic automatic system according to the received welding seam signal to control strip steel of different strength welding seams to pass through welding seams by adopting different rolling methods when passing through each rack of the continuous rolling mill. The invention solves the problem of strip breakage during the process of passing the welding seam through the weak-strength welding seam strip steel, realizes the maximization of the productivity of the continuous rolling mill unit, and reduces the workload of manual intervention.
Description
Technical Field
The invention belongs to the technical field of continuous rolling of strip steel, and particularly relates to an automatic rolling method for a weak-strength welding line of a continuous rolling mill.
Background
With the development of light weight of automobiles, high-strength steel, particularly ultra-high-strength steel, has been widely used in recent years for automobile bodies. The problem of easy breakage of welding lines occurs in the continuous rolling process of high-strength steel, particularly high-strength steel (QP steel, quenching and Partitioning), the welding lines are brittle, the occurrence rate of breakage of the welding lines exceeds 50% once during rolling, the unit productivity is severely restricted, the roll surface is easily damaged after the breakage occurs, the roll consumption cost is increased, the production rhythm is influenced by roll replacement, and the productivity is lost. In order to solve the problem, a method of manually passing through a welding line and throwing a small roll is adopted once, and the loss is very large. In addition, with the increase of labor cost in recent years, it is increasingly desired that the rolling process be as little humanized, unmanned, intelligent as possible, and it is preferable to realize "one-key rolling". Therefore, the full-automatic control of the rolling process has been a trend.
Aiming at the problem that a continuous rolling mill is easy to break when passing through a welding line, in the prior method adopted, chinese patent CN200510046497.1 discloses a dynamic thickening rolling method for controlling the breakage of a cold-rolled thin strip steel, the method mainly aims at the problem that the welding line breakage problem cannot be avoided when the thicknesses of the produced high-strength steel and the ultra-high-strength steel reach 0.5mm or more, the strip steel with normal welding line strength is required to be obviously lost by the method, and the welding line with extremely weak welding line strength is required to be obviously lost; chinese patent CN201010614776.4 discloses a method for automatically controlling and rolling a weld, which keeps the tension of the strip steel basically unchanged, and the risk of breakage of the weld still exists for the weld with weak strength, and the automatic rolling is not performed for the weld with different strength, so in the process of fully automatic production of steel rolling, a solution for reducing the problem of breakage of the weld with weak strength in the rolling of high-strength steel and ultra-high-strength steel is needed to be proposed in the industry.
Disclosure of Invention
In order to solve at least one of the technical problems, the invention provides an automatic rolling method for a weak-strength welding seam of a tandem mill.
The aim of the invention is achieved by the following technical scheme:
the invention provides a continuous rolling mill weak strength welding seam automatic rolling method, which comprises a continuous rolling mill basic automatic system, wherein the continuous rolling mill basic automatic system is connected with a pressing automatic controller, welding seam strength identification information comprising a welding seam strength classification preset value and an overwelding seam finished product thickness addition amount set according to the welding seam strength classification preset value is set through the continuous rolling mill basic automatic system, a welding seam automatic tracker for detecting a strip steel welding seam is arranged at an inlet of a continuous rolling mill, when the welding seam automatic tracker detects the strip steel welding seam, a welding seam signal is sent to the pressing automatic controller, and the pressing automatic controller is combined with welding seam strength identification information of the basic automatic system according to the received welding seam signal to control strip steel of different strength welding seams to pass through the welding seam by adopting different rolling methods when passing through each rack of the continuous rolling mill.
As a further improvement, the weld strength classification preset values are classified into three types, namely normal rolling, low tension rolling under low pressure and blank passing weld.
As a further improvement, when the preset value of the weld joint strength classification is normal rolling, the automatic controller is pressed down to control the continuous rolling mill to roll the weld joint of the strip steel in a conventional normal rolling method; when the preset value of the weld joint strength classification is low-pressure low-tension rolling, the automatic rolling controller is used for controlling the continuous rolling mill to reduce speed, starting from the last frame, according to the distribution rule of the cold continuous rolling reduction, the rolling target thickness is adjusted forward from frame to frame, the rolling tension is reduced to 80% of the normal tension, and the rolling of the strip steel at the tail of the forward strip steel, the weld joint of the strip steel and the head of the backward strip steel at the same time under low pressure is realized; when the preset value of the strength classification of the welding line is the empty passing welding line, the automatic controller is pressed down to control the continuous rolling mill to reduce speed, the tail of the strip steel which moves forward gradually lifts the roller forwards from the last frame to pass through the welding line, and the automatic rolling is carried out again by the roller after the welding line of the strip steel passes through the last frame and the speed is increased.
As a further improvement, when the low-tension rolling passing weld joint is adopted by the low-pressure low-tension welding seam strip steel, the positive bending force of each working roll of the continuous rolling mill is increased by 18% -22% in order to reduce the stress of two side edge parts of the welding seam of the strip steel.
As a further improvement, when the target thickness adding amount of the finished product of the overseam is set according to the preset value of the intensity classification of the weld, the target thickness adding amount of the finished product of the overseam is defaulted to 0 when the preset value of the intensity classification of the weld is normal rolling, the target thickness adding amount of the finished product of the overseam is defaulted to be larger than the value of the thickness of the strip steel when the preset value of the intensity classification of the weld is blank passing the weld, and the target thickness adding amount of the finished product of the overseam is defaulted to 0.2mm when the preset value of the intensity classification of the weld is low tension rolling.
As a further improvement, outlet flying shears and a coiling machine are respectively and sequentially arranged at the outlet of the continuous rolling mill.
As a further improvement, the split roll shearing mode of the outlet flying shears is set by the continuous mill basic automation system, and comprises an advance shearing mode, a front economic shearing mode, a normal shearing mode, a rear economic shearing mode and a rear shearing mode.
As a further improvement, in the advanced shearing mode, the outlet flying shears select to shear and divide rolls at a starting adjusting point of the target thickness of the strip steel advancing roll tail; in the front economic shearing mode, the outlet flying shears shear and separate rolls according to the length required by stable tension building of the coiling machine; in a normal shearing mode, the outlet flying shears cut the strip steel according to conventional logic shears; in the back economic shearing mode, the strip steel welding seam passes through the outlet flying shears for 1 meter, and then the outlet flying shears start to cut and roll; in the hysteresis cutting mode, the strip steel coil to be forwarded is coiled on a coiling machine, the thickness dynamic adjustment section of the strip steel coil to be forwarded is coiled together, and then the strip steel coil is coiled again by the flying shears.
As a further improvement, the split-coil shearing mode is set according to a weld strength classification preset value, and when the weld strength classification preset value is normal rolling, the split-coil shearing mode is a normal shearing mode; when the preset value of the weld joint strength classification is low-tension rolling under low pressure or the weld joint is passed through in a blank mode, (1) if the width of the forward strip steel roll is more than 3mm greater than that of the backward strip steel roll, the roll separation shearing mode is a hysteresis shearing mode; (2) If the width of the forward strip steel coil is smaller than that of the backward strip steel coil by more than 3mm, the coil separating shearing mode is an advance shearing mode; (3) When the difference between the widths of the front and rear strip steel rolls is within + -3 mm, the roll-dividing shearing mode is a front economic shearing mode.
As a further improvement, the strip steel with the weak strength weld joint is rolled by adopting an original weld joint passing continuous rolling mill.
The invention provides a continuous rolling mill weak strength welding seam automatic rolling method, which comprises a continuous rolling mill basic automatic system, wherein the continuous rolling mill basic automatic system is connected with a pressing automatic controller, welding seam strength identification information comprising a welding seam strength classification preset value and an overwelding seam finished product thickness addition amount set according to the welding seam strength classification preset value is set through the continuous rolling mill basic automatic system, a welding seam automatic tracker used for detecting a strip steel welding seam is arranged at an inlet of a continuous rolling mill, when the welding seam automatic tracker detects the strip steel welding seam, a welding seam signal is sent to the pressing automatic controller, and the pressing automatic controller is combined with welding seam strength identification information of the basic automatic system according to the received welding seam signal to control strip steel of different strength welding seams to pass through the welding seam by adopting different rolling methods when passing through each rack of the continuous rolling mill. When the automatic rolling mill rolling device is used, when the strip steel with different strength welding seams passes through the automatic welding seam tracker, the automatic welding seam tracker sends a welding seam signal to the automatic rolling mill rolling controller after detecting the welding seam of the strip steel, the automatic rolling controller determines whether to dynamically adjust the target thickness of the strip steel before and after the welding seam and reduce rolling tension according to the strength classification value of the welding seam of the strip steel, normal passing of the strip steel before and after the weak strength welding seam or automatic rolling with small rolling reduction or automatic blank passing are realized, and the breakage rate of the strip steel with the weak strength welding seam during rolling is reduced.
The invention has the following beneficial effects:
(1) The problem of broken strip when the strip steel with the weak strength weld joint passes through the weld joint rolling is solved;
(2) The strip steel with normal welding seams is automatically rolled in a conventional mode;
(3) The productivity and the yield of the continuous rolling mill set are improved;
(4) The shutdown loss is reduced;
(5) The roller consumption is reduced;
(6) The production cost is reduced;
(7) The automatic steel rolling is realized, the manual intervention workload in the rolling process is reduced, and conditions are created for improving the labor efficiency and the per-man steel yield.
Drawings
The invention will be further described with reference to the accompanying drawings, in which embodiments do not constitute any limitation of the invention, and other drawings can be obtained by one of ordinary skill in the art without inventive effort from the following drawings.
FIG. 1 is a schematic flow chart of the present invention;
FIG. 2 is a schematic diagram of a five stand tandem mill apparatus layout according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a second six-stand tandem mill arrangement according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a tandem rolling mill apparatus layout of a third and fourth embodiment of the present invention.
In the figure: 11, strip steel; 12, a first stand of a continuous rolling mill; 13, a second stand of the continuous rolling mill; 14, a third rack of the continuous rolling mill; 15, a fourth stand of the continuous rolling mill; 16, a fifth stand of the continuous rolling mill; 17, a sixth stand of the continuous rolling mill; 21, a weld automatic tracker; 22, exporting flying shears; 23, a coiling machine.
Detailed Description
In order to make the technical solution of the present application better understood by those skilled in the art, the present application will be described in further detail with reference to the accompanying drawings and the specific embodiments, and it should be noted that the embodiments of the present application and features in the embodiments may be combined with each other without conflict.
Referring to fig. 1, the embodiment of the invention provides an automatic rolling method for a weak-strength welding seam of a continuous rolling mill, which comprises a continuous rolling mill basic automatic system, wherein the continuous rolling mill basic automatic system is connected with a pressing automatic controller, the pressing automatic controller is connected with a control end of the continuous rolling mill, and the pressing automatic controller is also connected with a process controller.
The method comprises the steps of setting weld strength identification information comprising a weld strength classification preset value and an overweld finished product target thickness addition amount set according to the weld strength classification preset value through a continuous rolling mill basic automation system, wherein the weld strength classification preset value is divided into three types, namely normal rolling N, low-tension rolling L under low pressure and blank passing weld K.
When the preset value of the weld joint strength classification is normal rolling, the automatic controller is pressed down to control the continuous rolling mill to roll the weld joint of the strip steel 11 by a conventional normal rolling method; when the preset value of the weld joint strength classification is low-pressure low-tension rolling, the automatic rolling controller is used for controlling the continuous rolling mill to reduce the speed, starting from the last frame, according to the distribution rule of the cold continuous rolling reduction, the rolling target thickness is adjusted forward from frame to frame, the rolling tension is reduced to 80% of the normal tension, and the strip tail of the forward strip steel 11, the weld joint of the strip steel 11 and the strip head of the backward strip steel 11 are simultaneously used for rolling the strip steel under low-pressure low-tension; when the preset value of the strength classification of the welding line is the empty passing welding line, the automatic controller is pressed down to control the continuous rolling mill to reduce speed, the tail of the strip steel 11 which moves forward gradually lifts the roll forward from the last frame to pass through the welding line, and the automatic rolling is carried out again by the roll after the welding line of the strip steel 11 passes through the last frame and the speed is increased. After the preset value of the weld joint strength classification is set, the method is divided into a manual mode or an automatic mode, in the manual mode, the preset value of the weld joint strength classification defaults to be a normal rolling value, when low-pressure low-tension rolling is needed, the preset value of the weld joint strength classification is manually modified to be a low-pressure low-tension rolling value, and when empty passing weld joint is needed, the preset value of the weld joint strength classification is manually modified to be an empty passing weld joint value; in the automatic mode, the automatic controller is pressed down by the continuous rolling mill to continuously inquire a static table of the process controller according to the welding grades before and after the welding seam, and the static table is dynamically maintained by technicians of the continuous rolling mill.
When the target thickness adding amount of the finished overseam product is set according to the preset value of the weld strength classification, the target thickness adding amount of the finished overseam product of the strip steel 11 defaults to 0 when the preset value of the weld strength classification is normal rolling, the target thickness adding amount of the finished overseam product of the strip steel 11 defaults to a value larger than the thickness of the strip steel 11 when the preset value of the weld strength classification is blank passing through the weld, the target thickness adding amount of the finished overseam product of the strip steel 11 defaults to 0.2mm when the preset value of the weld strength classification is low tension rolling, and the target thickness adding amount of the finished overseam product of the strip steel 11 can be manually modified.
An automatic seam tracker 21 for detecting the seam of the strip steel is arranged at the inlet of the continuous rolling mill, the automatic seam tracker 21 can be a visual sensor or a finished product on the existing market, is not limited herein, and mainly obtains the seam information of the strip steel 11. When the automatic weld tracker 21 detects the weld of the strip steel 11, a weld signal is sent to a pressing automatic controller, and when the automatic rolling mill pressing automatic controller receives the weld signal, the starting time of the tail target thickness of the forward strip steel coil is adjusted according to the distance from the automatic weld tracker 21 to the last frame of the continuous rolling mill, the tail incoming material thickness of the forward strip steel coil, the finished product target thickness and the rolling reduction distribution of the continuous rolling mill, and the length of the tail target thickness adjustment of the forward strip steel coil is controlled within a range of 30 meters. The automatic pressing controller is used for controlling the strip steel 11 with different welding seams to pass through each rack of the continuous rolling mill by adopting different rolling methods according to the received welding seam signals and the welding seam strength identification information of the basic automatic system.
As a further preferred embodiment, for the strip steel 11 with a weak strength welding seam, the edge of the welding seam is not dug by edge-digging scissors after welding and edge-digging scissors before a circle shear, if edge-digging is needed by circle shear feeding or retracting, the edge-digging is delayed after the welding seam or the edge-digging is advanced before the welding seam, the welding seam is avoided, and the original welding seam is adopted to pass through a rolling mill. In addition, when the weak strength welded seam strip steel 11 is rolled by adopting low tension at low pressure, in order to reduce the stress of two side edge parts of the welded seam of the strip steel 11, the positive bending force of each working roll of the continuous rolling mill is increased by 18% -22%, and more preferably, the positive bending force of each working roll of the continuous rolling mill is increased by 20%.
As a further preferred embodiment, outlet flying shears 22 and coiler 23 are provided in this order at the outlet of the continuous rolling mill, respectively. The split roll shear mode of the outlet flying shears 22 is set by the continuous mill base automation system and includes a 1-advance shear mode, a 2-front economy shear mode, a 3-normal shear mode, a 4-rear economy shear mode, and a 5-lag shear mode.
In the advanced cutting mode, the outlet flying shears 22 select to cut and slit the strip at the starting adjusting point of the target thickness of the tail of the strip of the forward strip, and the tail of the strip of the forward strip can be ensured to be rolled according to the target thickness in consideration of the control hysteresis; in the front economic shearing mode, the outlet flying shears 22 shear and divide rolls according to the length required by the stable tension building of the coiling machine 23, the tail of the forward strip steel coil and the welding line are wrapped on the coiling machine 23 together, the stable tension building of the welding line of the strip steel 11 is realized, and the post strip steel after the stable tension building can start rolling according to the normal target thickness; in the normal shearing mode, the outlet flying shears 22 cut the strip steel 11 into rolls according to conventional logic shears; in the back economic shearing mode, the strip steel 11 is sheared and coiled again by the outlet flying shears 22 after passing through 1 meter of the outlet flying shears 22; in the hysteresis cutting mode, the strip steel coil to be forwarded winds the dynamic thickness adjusting section of the strip steel coil to be forwarded on the winding machine 23, and then the strip steel coil is wound again by the flying shears 22, so that the strip steel to be forwarded is rolled according to the normal target thickness from the strip head.
As a further preferable embodiment, the split-coil shearing mode is set according to a weld strength classification preset value, and when the weld strength classification preset value is normal rolling, the split-coil shearing mode is a normal shearing mode; when the preset value of the weld joint strength classification is low-tension rolling under low pressure or the weld joint is passed through in a blank mode, (1) if the width of the forward strip steel coil is more than 3 mm greater than the width of the backward strip steel coil, the coil separating shearing mode is a lag shearing mode; (2) If the width of the strip steel forward coil is smaller than the width of the strip steel backward coil by more than 3 mm, the coil separating and shearing mode is an advance shearing mode, so that the edge of the wide strip steel is prevented from being clamped and broken during the coiling; (3) When the difference between the forward and backward coil widths of the strip steel is within +/-3 mm, the coil separating shearing mode is a front economic shearing mode.
In the first embodiment of the invention:
As shown in FIG. 2, when the five-stand continuous rolling mill is used for rolling, the length between stands is 5m, the automatic weld joint tracker 21 is arranged at the position 5m in front of the first stand 12 of the continuous rolling mill, the outlet flying shear 22 is arranged at the position 6m behind the fifth stand 16 of the rolling mill, and the distance between the outlet flying shear 22 and the coiling machine 23 is 1.5 m. The pass weld rolling logic is shown in figure 1. When high-strength steel is rolled, the weld strength is lower, the continuous rolling mill cannot roll according to a default normal mode when passing through the weld of the strip steel 11, and an operator modifies the preset value of the weld strength classification into L on an operation picture of a basic automation system of the continuous rolling mill. And after the preset value of the weld joint strength classification is modified to L in the continuous mill basic automation system, the target thickness adding amount of the finished product of the overweld joint is defaulted to be 0.2mm. When the welding seam of the strip steel 11 reaches the automatic welding seam tracker 21 in front of the continuous rolling mill, the automatic rolling mill depressing controller decelerates the continuous rolling mill, starts from the last frame (namely the fifth frame), adjusts and improves the rolling target thickness forward from frame to frame according to the distribution rule of the cold continuous rolling depressing rate, reduces the tension between frames to 80% of the original target tension, and realizes the low-pressure small-tension rolling of the strip steel 11 in front of and behind the welding seam.
The rolling machine basic automation system defaults to a 3-normal shearing mode in a rolling machine basic automation system, the thickness of the incoming material of the forward strip steel coil is 2.8mm 1280mm, the thickness of the finished product is 1.2mm, the thickness of the incoming material of the backward strip steel coil is 2.5mm 1250mm, the thickness of the finished product is 1.0mm, and the five-rack pressing distribution ratio of the forward strip steel coil is as shown in the following table 1:
table 1 example one roll reduction ratio distribution ratio
| Rack | A frame | Two frames | Three-frame | Four-rack | Five-rack |
| Reduction ratio (%) | 37.14 | 28.08 | 21.61 | 11.27 | 1.90 |
The following strip coil reduction distribution ratios are shown in table 2:
table 2 example two proportion of the rolling reduction of the downstream strip
| Rack | A frame | Two frames | Three-frame | Four-rack | Five-rack |
| Reduction ratio (%) | 38.26 | 30.15 | 19.76 | 10.25 | 1.58 |
When the weld of the strip steel 11 reaches the weld automatic tracker 21 before the continuous rolling mill, the continuous rolling mill depressing automatic controller reduces the speed of the continuous rolling mill to 60mpm, and immediately increases the target thickness of the forward strip steel coil by 0.2mm, wherein the increased target thickness of the forward strip steel coil by 0.2mm is set according to the current five-rack rolling reduction distribution proportion of the forward strip steel coil, the forward strip steel coil is sequentially regulated by a fifth rack, and the target thickness and the regulating quantity of the forward strip steel coil outlet of each rack passing the weld stage of the strip steel 11 are shown in table 3:
table 3 example one frame over-weld stage advancing strip coil exit target thickness and adjustment
| Rack | An inlet | A frame | Two frames | Three-frame | Four-rack | Five-rack |
| Before welding (mm) | 2.8 | 2.206 | 1.756 | 1.411 | 1.230 | 1.2 |
| When passing the weld joint (mm) | 2.8 | 2.280 | 1.887 | 1.584 | 1.427 | 1.4 |
| Adjustment quantity (mm) | 0.074 | 0.131 | 0.173 | 0.197 | 0.2 |
Then, the target thickness of the backward strip steel coil is also increased by 0.2mm, the increased 0.2mm is set according to the current rolling reduction distribution proportion of each frame of the backward strip steel coil, the first frame sequentially adjusts the backward strip steel 11 to be in a normal rolling state after passing through the welding line of the strip steel 11, and the target thickness and the adjustment quantity of the outlet of the backward strip steel coil of each frame after passing through the welding line stage of the strip steel 11 are shown in the table 4:
Table 4 example one frame passing weld stage post strip coil exit target thickness and adjustment
| Rack | An inlet | A frame | Two frames | Three-frame | Four-rack | Five-rack |
| When passing the weld joint (mm) | 2.5 | 2.003 | 1.611 | 1.354 | 1.220 | 1.2 |
| After passing the weld (mm) | 2.5 | 1.926 | 1.474 | 1.177 | 1.024 | 1.0 |
| Adjustment quantity (mm) | -0.077 | -0.137 | -0.177 | -0.196 | -0.2 |
Before the continuous rolling mill passes the welding seam, an operator changes the coil separating shearing mode of a basic automation system of the continuous rolling mill into a 5-lag shearing mode, and after the welding seam of the strip steel 11 is wrapped in the coiling machine 23, the back-going strip steel coil starts to roll normally from front to back frame to frame according to the target thickness of the product. When the starting point of the normal target thickness of the backward strip coil passes through the outlet flying shears 22, the backward strip coil starts to be sheared, and when the backward strip coil is stably tensioned in the coiling machine 23, the machine set starts to automatically roll at a speed up.
In the second embodiment of the invention:
As shown in fig. 3, in the case of the six-stand continuous rolling mill, the inter-stand length is 5.5m, the automatic weld tracker 21 is disposed 15 m in front of the first stand 12, the outlet flying shears 22 are disposed 5m behind the sixth stand 17 of the rolling mill, and the outlet flying shears are separated from the coiler by 2.0 m. The pass weld rolling logic is shown in figure 1. When high-strength steel (welding grade 5) is rolled, the weld strength is relatively low, and the continuous rolling mill cannot roll in a normal mode when passing through the weld. If the product with the welding grade of 1 is welded with the product, as can be seen from the table 5, the preset value of the welding line strength classification is K; if the product of weld grade 4 is welded thereto, it can be seen from Table 5 that the weld strength classification preset is L.
Table 5 example of preset values for strength classification of two-grade weld joint
In the embodiment, the welding grade of the forward strip steel coil is 4, the thickness of the incoming material is 2.5mm by 1280mm, the thickness of the finished product is 1.0mm, the welding grade of the backward strip steel coil is 5, the thickness of the incoming material is 2.6mm by 1300mm, the thickness of the finished product is 1.3mm, and the target thickness adding amount of the overseam finished product is manually modified to be 0.3mm by an operator after welding the strip steel 11 weld joint. When the welding seam of the strip steel 11 reaches the automatic welding seam tracker 21 in front of the continuous rolling mill, the automatic welding seam tracker 21 is far away from the first stand, in order to reduce loss, when the welding seam reaches 5 meters in front of the first stand, the continuous rolling mill presses down the automatic controller to reduce the speed of the continuous rolling mill, and from the sixth stand, the rolling target thickness is improved by adjusting the stand by stand according to the distribution rule of the cold continuous rolling reduction, the strip steel 11 before and after the welding seam is rolled under low pressure and low tension, and the tension between the stands is reduced to 80% of the original target tension.
The coil-separating shearing mode in this example is preset to be an advance shearing mode, the six-rack pressing distribution ratio of the forward strip coil is shown in table 6, and the downstream strip coil pressing distribution ratio is shown in table 7.
Table 6 proportion of Rolling reduction of Forward strip
| Rack | A frame | Two frames | Three-frame | Four-rack | Five-rack | Six-rack |
| Distribution ratio (%) | 26.57 | 21.9 | 19.76 | 19.96 | 10.53 | 1.28 |
Table 7 proportion of the reduction ratio of the second example of the downstream strip coil
| Rack | A frame | Two frames | Three-frame | Four-rack | Five-rack | Six-rack |
| Distribution ratio (%) | 27.57 | 21.31 | 20.34 | 17.45 | 11.87 | 1.46 |
When the weld joint of the strip steel 11 reaches the starting dynamic adjustment position, the continuous rolling mill depressing automatic controller reduces the speed of the continuous rolling mill to 50mpm, and increases the target thickness of the forward strip steel coil by 0.3mm, wherein the increased target thickness of the forward strip steel coil by 0.3mm is set according to the current frame depressing ratio distribution proportion of the forward strip steel coil, the forward strip steel coil is sequentially adjusted by a sixth frame, and the target thickness and the adjustment quantity of the forward strip steel coil at the stage of passing the weld joint of each frame are shown in table 8.
Table 8 example two target thickness and adjustment of the exit of the advancing coil at the seam crossing stage of each frame
| Rack | An inlet | A frame | Two frames | Three-frame | Four-rack | Five-rack | Six-rack |
| Before welding (mm) | 2.5 | 2.101 | 1.773 | 1.477 | 1.177 | 1.019 | 1.0 |
| When passing the weld joint (mm) | 2.5 | 2.181 | 1.918 | 1.681 | 1.442 | 1.315 | 1.3 |
| Adjustment quantity (mm) | 0.080 | 0.145 | 0.204 | 0.265 | 0.296 | 0.3 |
Then, the target thickness of the backward strip steel coil is also increased by 0.3mm, the increased 0.3mm is set according to the current rolling reduction distribution proportion of each frame of the backward strip steel coil, the first frame is sequentially and backwards adjusted to be in a normal rolling state after the welding line is passed, and the target thickness and the adjustment quantity of the outlet of the backward strip steel coil at the welding line passing stage of each frame are shown in table 9.
Table 9 example two target thickness and adjustment of the post-roll exit from each frame over-weld stage
| Rack | An inlet | A frame | Two frames | Three-frame | Four-rack | Five-rack | Six-rack |
| When passing the weld joint (mm) | 2.6 | 2.324 | 2.111 | 1.908 | 1.733 | 1.615 | 1.6 |
| After passing the weld (mm) | 2.6 | 2.242 | 1.965 | 1.700 | 1.473 | 1.319 | 1.3 |
| Adjustment quantity (mm) | -0.082 | -0.146 | -0.208 | -0.260 | -0.296 | -0.3 |
When the starting point of the thickness added rolling of the tail of the front strip steel 11 reaches 1m before the outlet flying shear 22, shearing is performed in advance, and after the welding line of the tail of the front strip steel is wrapped in the coiling machine 23, the rear strip steel starts to roll normally according to the target thickness of the product and starts to speed up.
The third embodiment of the invention:
As shown in fig. 4, in the four-stand continuous rolling mill, the inter-stand length is 5m, the automatic weld tracker 21 is arranged at the front 10m of the first stand 12 of the continuous rolling mill, the outlet flying shear 22 is arranged at the rear 6m of the fourth stand 15, and the distance between the outlet flying shear 22 and the coiler 23 is 2.5 m. The pass weld rolling logic is shown in figure 1. The thickness of the incoming material of the forward strip steel coil is 2.3mm or 1150mm, the thickness of the finished product is 1.0mm, the thickness of the incoming material of the backward strip steel coil is 2.3mm or 1150mm, and the thickness of the finished product is 1.0mm. When the preset value of the strength classification of the welding seam is changed into K, the welding seam starts to automatically slow down to 40mpm according to theoretical calculation before reaching the automatic weld tracker 21, when the welding seam of the strip steel 11 reaches the automatic weld tracker 21, the automatic continuous rolling mill pressing controller corrects the welding seam position of the strip steel 11, when the welding seam reaches the first frame 12 of the continuous rolling mill, the automatic continuous rolling mill pressing controller controls the continuous rolling mill to automatically lift the roller from the back to the front and pass the welding seam from the front to the back, and when the welding seam of the strip steel 11 passes through the fourth frame 15 of the rolling mill, the automatic continuous rolling mill pressing controller controls the continuous rolling mill to start rolling from the front to the back from the frame to the back. In this embodiment, a preset frame of a split-coil cutting mode is further provided on an operation frame of the rolling mill basic automation L1 system, and is divided into a 1-advanced cutting mode, a 2-normal cutting mode, and a 3-delayed cutting mode, and the system defaults to the 2-normal cutting mode, and the preset value can be manually modified.
In the above description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than as described herein, and therefore should not be construed as limiting the scope of the present invention.
In summary, while the above-described preferred embodiments have been described, it should be noted that although various changes and modifications can be made by those skilled in the art, it is intended that such changes and modifications be included within the scope of the present invention unless they depart from the scope of the present invention.
Claims (8)
1. The automatic rolling method of the weak-strength welding seam of the continuous rolling mill comprises a continuous rolling mill basic automatic system, wherein the continuous rolling mill basic automatic system is connected with a pressing automatic controller, and is characterized in that welding seam strength identification information comprising a welding seam strength classification preset value and an overwelding seam finished product thickness addition amount set according to the welding seam strength classification preset value is set through the continuous rolling mill basic automatic system, a welding seam automatic tracker used for detecting a strip steel welding seam is arranged at an inlet of the continuous rolling mill, a welding seam signal is sent to the pressing automatic controller when the welding seam automatic tracker detects the strip steel welding seam, and the pressing automatic controller is combined with welding seam strength identification information of the basic automatic system according to the received welding seam signal to control strip steel of welding seams with different strengths to pass through welding seams of each rack of the continuous rolling mill by adopting different rolling methods;
The weld strength classification preset values are divided into three types, namely normal rolling, low tension rolling under low pressure and blank passing weld;
When the preset value of the weld joint strength classification is normal rolling, the automatic controller is pressed down to control the continuous rolling mill to roll the weld joint of the strip steel by a conventional normal rolling method; when the preset value of the weld joint strength classification is low-pressure low-tension rolling, the automatic rolling controller is used for controlling the continuous rolling mill to reduce speed, starting from the last frame, according to the distribution rule of the cold continuous rolling reduction, the rolling target thickness is adjusted forward from frame to frame, the rolling tension is reduced to 80% of the normal tension, and the rolling of the strip steel at the tail of the forward strip steel, the weld joint of the strip steel and the head of the backward strip steel at the same time under low pressure is realized; when the preset value of the strength classification of the welding line is the empty passing welding line, the automatic controller is pressed down to control the continuous rolling mill to reduce speed, the tail of the strip steel which moves forward gradually lifts the roller forwards from the last frame to pass through the welding line, and the automatic rolling is carried out again by the roller after the welding line of the strip steel passes through the last frame and the speed is increased.
2. The automatic rolling method for the weak-strength weld joint of the continuous rolling mill according to claim 1, wherein when the weak-strength weld joint strip steel is rolled by adopting low tension at low pressure to pass the weld joint, the positive bending force of each working roll of each stand of the continuous rolling mill is increased by 18% -22% in order to reduce the stress of two side edge parts of the weld joint of the strip steel.
3. The automatic rolling method for the weak-strength weld joint of the continuous rolling mill according to claim 1, wherein when the target thickness addition amount of the finished product of the weld joint is set according to the preset value of the weld joint strength classification, the target thickness addition amount of the finished product of the weld joint is defaulted to 0 when the preset value of the weld joint strength classification is normal rolling, the target thickness addition amount of the finished product of the weld joint is defaulted to a value larger than the thickness of the strip steel when the preset value of the weld joint strength classification is blank passing the weld joint, and the target thickness addition amount of the finished product of the weld joint is defaulted to 0.2mm when the preset value of the weld joint strength classification is low-pressure low-tension rolling.
4. The automatic rolling method for the weak-strength weld joint of the continuous rolling mill according to claim 1, wherein the outlet flying shears and the coiling machine are respectively arranged at the outlet of the continuous rolling mill in sequence.
5. The automatic rolling method for weak-strength weld joints of a continuous mill according to claim 4, wherein the split-roll shearing mode of the outlet flying shears is set by a basic automation system of the continuous mill, and the split-roll shearing mode comprises an advance shearing mode, a front economic shearing mode, a normal shearing mode, a rear economic shearing mode and a rear shearing mode.
6. The automatic rolling method of the weak-strength weld joint of the continuous rolling mill according to claim 5, wherein in the advanced shearing mode, the outlet flying shears select to shear and separate rolls at a starting adjusting point of the target thickness of the strip steel advancing tail coil; in the front economic shearing mode, the outlet flying shears shear and separate rolls according to the length required by stable tension building of the coiling machine; in a normal shearing mode, the outlet flying shears cut the strip steel according to conventional logic shears; in the back economic shearing mode, the strip steel welding seam passes through the outlet flying shears for 1 meter, and then the outlet flying shears start to cut and roll; in the hysteresis cutting mode, the strip steel coil to be forwarded is coiled on a coiling machine, the thickness dynamic adjustment section of the strip steel coil to be forwarded is coiled together, and then the strip steel coil is coiled again by the flying shears.
7. The automatic rolling method for the weak-strength weld joint of the continuous rolling mill according to claim 5, wherein the split-coil shearing mode is set according to a weld joint strength classification preset value, and when the weld joint strength classification preset value is normal rolling, the split-coil shearing mode is a normal shearing mode; when the preset value of the weld joint strength classification is low-tension rolling under low pressure or the weld joint is passed through in a blank mode, (1) if the width of the forward strip steel roll is more than 3mm greater than that of the backward strip steel roll, the roll separation shearing mode is a hysteresis shearing mode; (2) If the width of the forward strip steel coil is smaller than that of the backward strip steel coil by more than 3mm, the coil separating shearing mode is an advance shearing mode; (3) When the difference between the widths of the front and rear strip steel rolls is within + -3 mm, the roll-dividing shearing mode is a front economic shearing mode.
8. The automatic rolling method for the weak-strength weld joint of the continuous rolling mill according to claim 1, wherein the strip steel with the weak-strength weld joint is rolled by adopting an original weld joint to pass through the continuous rolling mill.
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| CN1857809A (en) * | 2005-05-20 | 2006-11-08 | 鞍山钢铁集团公司 | Dynamic thickening rolling process of controlling break of cold rolled thin strip steel |
| CN105251776A (en) * | 2014-07-16 | 2016-01-20 | 鞍钢股份有限公司 | Cold continuous rolling mill strip steel tracking processing method |
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| CN101780480B (en) * | 2009-01-16 | 2012-05-30 | 宝山钢铁股份有限公司 | Strip steel head thickness control compensation method when welding seam passes through frame |
| CN102172634B (en) * | 2010-12-30 | 2012-12-12 | 攀钢集团钢铁钒钛股份有限公司 | Method for rolling welding line under automatic control |
| JP5637906B2 (en) * | 2011-03-08 | 2014-12-10 | 株式会社神戸製鋼所 | Thickness control method and thickness control device for cold rolling mill |
| CN104324939B (en) * | 2014-09-04 | 2017-10-10 | 首钢京唐钢铁联合有限责任公司 | Strip steel rolling method |
| CN113926863A (en) * | 2020-06-29 | 2022-01-14 | 宝山钢铁股份有限公司 | Strip steel speed control method and electronic equipment and medium thereof |
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| CN1857809A (en) * | 2005-05-20 | 2006-11-08 | 鞍山钢铁集团公司 | Dynamic thickening rolling process of controlling break of cold rolled thin strip steel |
| CN105251776A (en) * | 2014-07-16 | 2016-01-20 | 鞍钢股份有限公司 | Cold continuous rolling mill strip steel tracking processing method |
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