CN109807192B - Method for controlling flanging of high-magnetic-induction oriented silicon steel coil - Google Patents
Method for controlling flanging of high-magnetic-induction oriented silicon steel coil Download PDFInfo
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- CN109807192B CN109807192B CN201910090974.6A CN201910090974A CN109807192B CN 109807192 B CN109807192 B CN 109807192B CN 201910090974 A CN201910090974 A CN 201910090974A CN 109807192 B CN109807192 B CN 109807192B
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Abstract
The invention discloses a method for controlling the flanging of a high magnetic induction oriented silicon steel coil, which comprises the following nine procedures of normalized cooling, rolling, trimming, rewinding, continuous annealing, high-temperature annealing, stretching annealing, laser scoring and finishing, shearing and subpackaging to prepare the high magnetic induction oriented silicon steel coil and control the flanging; when the method is used on site, the flanging amount of the high-temperature HIB of 0.18-0.3 mm series is obviously reduced. According to the invention, through implementation of measures, the generation of flanging is greatly reduced, and the yield is improved by 0.5%.
Description
Technical Field
The invention relates to the field of oriented silicon steel manufacturing, in particular to a method for controlling the flanging of a high-magnetic-induction oriented silicon steel coil.
Background
The high magnetic induction grain-oriented silicon steel is an important electrical soft magnetic material and is mainly applied to the manufacture of large-scale power transformers and high-efficiency energy-saving variable iron cores. The defect of flanging in the production process of the oriented silicon steel always troubles the important defect of normal production of the oriented silicon steel. The defect appears as: after high-temperature annealing, the steel strip is deformed due to the action of thermal stress and bulges in the width direction, and the height h of the bulge can reach 30mm (shown in figure 1), so that flattening stretching annealing is required. The strip is typically flattened by a 0.25% to 0.75% elongation draw anneal at about 860 c. After the annealing is finished, the steel strip is flat, the plate shape becomes good, and the influence of edge burrs on the coiling process is increased. If the edge burrs are large and reach about 30 mu, the edge burrs are superposed to cause edge protrusion when the edge is rolled by stretching and flattening (CT), and the edge is cracked and cracked under the action of rolling tension. The stretching and flattening operator can only adopt manual control EPC misalignment 10mm to carry out coiling.
After the stretching, flattening, annealing and coiling are finished, edge waves are increased during edge finishing and shearing; at the moment, the steel clamping is easily caused at the chute of the rotary shear due to the large edge wave, an operator handles the waste force when the steel clamping is waste, and the potential safety hazard also exists. Because the maximum width of the finishing trimming edge is 60mm, the steel coil still needs to be subjected to size change treatment, and the capacity is influenced.
The macrostructure of the finished product is analyzed, and the characteristics are that a local fine crystal band is formed on the edge part, or secondary recrystallization is not developed completely or the grain size is greatly different. Aiming at the phenomenon, the existing coping strategy is generally to reduce the temperature difference of cold and hot spots of the steel coil in the high-temperature annealing process as much as possible by adjusting the high-temperature annealing process, adjusting the combustion state of the high-temperature annealing furnace and improving the type of the bottom plate, thereby improving the edge quality of the steel coil. However, the technology has high difficulty in realization and high adjustment risk, and can not completely solve the problem of flanging defect.
Disclosure of Invention
The invention provides a method for controlling the flanging of a high-magnetic induction oriented silicon steel coil aiming at the defect of flanging in the production process of the existing oriented silicon steel, and the method controls the flanging of the oriented silicon steel by controlling the way of controlling the burr quantity during pickling cooling and edge re-shearing and controlling the misalignment quantity during continuous annealing under the condition of not repeatedly adjusting a high-temperature annealing process.
In order to achieve the purpose, the invention designs a method for controlling the flanging of a high magnetic induction oriented silicon steel coil, which comprises nine procedures of normalized cooling, rolling, trimming, rewinding (steel coil needing to be repaired), continuous annealing, high-temperature annealing, stretching annealing, laser scoring (according to the requirement) and finishing, shearing and subpackaging to prepare the high magnetic induction oriented silicon steel coil and control the flanging, and is characterized in that:
1) normalizing and cooling: along the running direction of the steel belt, a normalized uniform cooling control technology is adopted, and the steel belt is symmetrically distributed on the upper part and the lower part of the steel beltAn upper spray pipe and a lower spray pipe, wherein the distance of the spray medium covering width direction is ensured to be 1.05-1.2 m, and nozzles are respectively arranged on the upper spray pipe and the lower spray pipe, wherein the spray pressure is 0.3-0.4 Mpa, and the dosage of the cooling medium is 40m3/h～60m3/h；
2) Rolling: after the CP unit normalizing annealing is finished, rolling the hot rolled plate into a cold rolled sheet with the thickness of 0.08-0.30 mm by a twenty-high rolling mill, wherein the control value of the edge part of the target plate shape curve of 1 pass is 10-15I in the rolling process, and keeping wide rolling; the shape control adopts a quadratic control process to realize wide loose edge rolling, ensure the waviness to be below 2 percent, the number of the waves to be 6/meter and the wave height to be below 3mm, and avoid the cracking caused by rolling;
3) trimming: after the rolling process is finished, a steel coil with edge crack larger than or equal to 5mm is arranged on one side, and the steel coil is subjected to single-side edge cutting; the step avoids the burr control difficulty during trimming the two sides of the steel coil;
4) rewinding: when edge cracks with the thickness of more than or equal to 5mm exist on two sides, the overlap amount of a cutting edge is set according to the thickness of no more than 10% of the plate thickness during edge cutting, and the residual burrs after edge cutting of the high-magnetic induction oriented silicon steel with the thickness of 0.18 mm-0.30 mm series are controlled to be less than 20 mu;
5) and (3) continuous annealing: the misalignment amount during continuous annealing and coiling was controlled to 2 mm. If the local misalignment amount exceeds the standard, the clamp can collide the edge when in lifting operation; cannot be eliminated when the edge is impacted after high-temperature annealing. And then, when the coil is carried out by drawing annealing, a bulge is formed at the edge collision position to form a flanging.
Further, in the step 1), 13 nozzles are arranged on the upper spray pipe, 14 nozzles are arranged on the lower spray pipe, and the rated flow of 4 nozzles at the end parts of two sides of each spray pipe is 50% -60% smaller than that of the rest nozzles.
Still further, in the step 1), the sprayed cooling water is industrial filtered water, and the physicochemical indexes are that the pH value is: 7.2-8.2, SS: ave < 5.0mg/l, total hardness: 6.3-8.36 dH.
The invention has the beneficial effects that:
1. when the method is used on site, the flanging amount of the high-temperature HIB of 0.18-0.3 mm series is obviously reduced.
2. The method greatly reduces the flanging by implementing the measure, and improves the yield by 0.5 percent.
Drawings
FIG. 1 is a schematic drawing of the deformation of a steel strip after high temperature annealing.
Detailed Description
The present invention is described in further detail below with reference to specific examples so as to be understood by those skilled in the art.
Example 1
The method for controlling the flanging of the high magnetic induction oriented silicon steel coil is used for preparing the high magnetic induction oriented silicon steel coil A with the thickness of 0.27mm, and the method prepares the high magnetic induction oriented silicon steel coil A through nine procedures of normalized cooling, rolling, trimming, rewinding (the steel coil needing to be repaired), continuous annealing, high-temperature annealing, stretching annealing, laser scoring (according to needs) and finishing, shearing and subpackaging, and controls the flanging thereof, wherein:
1) normalizing and cooling, wherein upper spray pipes and lower spray pipes are symmetrically distributed on the upper part and the lower part of the steel strip along the running direction of the steel strip by adopting a normalizing uniform cooling control technology, the distance of the spray medium covering width direction is ensured to be 1.05-1.2 m, nozzles are uniformly distributed on the upper spray pipes and the lower spray pipes, 13 nozzles are arranged on the upper spray pipes, 14 nozzles are arranged on the lower spray pipes, the rated flow of 4 nozzles at the end parts of the two sides of each spray pipe is 8.5L/h, the rated flow of other nozzles is 20L/h, the spray pressure is 0.3-0.4 MPa, and the consumption of the cooling medium is 45m3H; the sprayed cooling water is industrial filtered water, and the physical and chemical indexes are pH: 7.2-8.2, SS: ave < 5.0mg/l, total hardness: 6.3-8.36 dH;
2) rolling: after the CP unit normalizing annealing is finished, rolling a hot rolled plate with the thickness of 2.3mm by a twenty-high rolling mill to obtain a cold-rolled sheet with the thickness of 0.08-0.30 mm, wherein in the rolling process, the target edge of a target plate shape curve of 1 pass is controlled by 10I, the target edge of the target plate shape curve is actually controlled by 12I, and wide rolling is kept; the shape control adopts a quadratic control process to realize wide loose edge rolling, ensure the waviness to be below 2 percent, the number of the waves to be 6/meter and the wave height to be below 3mm, and avoid the cracking caused by rolling; actually measuring the wave length of the roll A to be 1.8%;
3) trimming: after the rolling process is finished, the coil A has no edge crack, and for continuous verification, the coil A and the coil A are transported to a CW unit for single-edge cutting, and the step avoids the burr control difficulty during edge cutting of two edges of the steel coil;
4) rewinding: when the overlap amount of the cutting edge is set in the step, the overlap amount of the roll A is set to be 0.02mm, and the burr of the roll A after edge shearing is actually measured to be 10 mu and less than 20 mu;
5) and (3) continuous annealing: staggered layers of the A roll continuous annealing CA unit are controlled to be 1mm when the A roll continuous annealing CA unit rolls; and no collision damage is generated in the lifting process from the CA unit to the annular furnace unit.
The high magnetic induction oriented silicon steel coil A does not have a flanging defect when passing through a CT unit, the control is successful, the average silicon steel procedure yield of the high magnetic induction oriented silicon steel coil A is 87.5 percent, the average silicon steel procedure yield of the silicon steel coil A is 87.3 percent, the level is better than that of a synchronous steel coil by 86.4 percent, the flanging defect is eliminated, and the high magnetic induction oriented silicon steel yield can be improved.
Example 2
The method for controlling the flanging of the high magnetic induction oriented silicon steel coil is used for preparing the high magnetic induction oriented silicon steel coil B with the thickness of 0.30mm, and the method prepares the high magnetic induction oriented silicon steel coil B through nine procedures of normalized cooling, rolling, trimming, rewinding (the steel coil needing to be repaired), continuous annealing, high-temperature annealing, stretching annealing, laser scoring (according to needs) and finishing, shearing and subpackaging, and controls the flanging thereof, wherein:
1) normalizing and cooling, wherein upper spray pipes and lower spray pipes are symmetrically distributed on the upper part and the lower part of the steel strip along the running direction of the steel strip by adopting a normalizing uniform cooling control technology, the distance of the spray medium covering width direction is ensured to be 1.05-1.2 m, nozzles are uniformly distributed on the upper spray pipes and the lower spray pipes, 13 nozzles are arranged on the upper spray pipes, 14 nozzles are arranged on the lower spray pipes, the rated flow of 4 nozzles at the end parts of the two sides of each spray pipe is 9L/h, the rated flow of other nozzles is 20L/h, the spray pressure is 0.3-0.4 Mpa, and the consumption of the cooling medium is 55m3H; the sprayed cooling water is industrial filtered water, and the physical and chemical indexes are pH: 7.2-8.2, SS: ave < 5.0mg/l, total hardness: 6.3-8.36 dH;
2) rolling: after the CP unit normalizing annealing is finished, rolling a hot rolled plate with the thickness of 2.3mm by a twenty-high rolling mill to obtain a cold-rolled sheet with the thickness of 0.08-0.30 mm, wherein in the rolling process, the target edge of a target plate shape curve of 1 pass is controlled by 10I, the target edge of the target plate shape curve is actually controlled by 12I, and wide rolling is kept; the shape control adopts a quadratic control process to realize wide loose edge rolling, ensure the waviness to be below 2 percent, the number of the waves to be 6/meter and the wave height to be below 3mm, and avoid the cracking caused by rolling; actually measuring the wave length of the roll B to be 1.65%;
3) trimming: after the rolling process is finished, no edge crack occurs in the roll B. For continuous verification, the coil B is transported to a CW unit for single-side edge cutting, and the step avoids the burr control difficulty during edge cutting of two sides of the steel coil;
4) rewinding: when the step sets the overlap amount of the shear blade, the overlap amount of the roll B is set to be 0.025 mm. Actually measuring the burrs of the roll B after edge shearing to be 16 mu and less than 20 mu;
5) and (3) continuous annealing: staggered layers of the roll B continuous annealing CA unit are controlled to be 1mm when the roll B continuous annealing CA unit rolls; and no collision damage is generated in the lifting process from the CA unit to the annular furnace unit.
The high magnetic induction oriented silicon steel coil B does not have the flanging defect when passing through a CT unit, the control is successful, the average silicon steel procedure yield of the high magnetic induction oriented silicon steel coil B is 86.7 percent, the average silicon steel procedure yield of the silicon steel coil A is 86.2 percent, the average silicon steel procedure yield is better than that of a synchronous steel coil by 85.8 percent, the flanging defect is eliminated, and the high magnetic induction oriented silicon steel yield can be improved.
Other parts not described in detail are prior art. Although the present invention has been described in detail with reference to the above embodiments, it is only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and the embodiments are within the scope of the present invention.
Claims (3)
1. The utility model provides a method for controlling high magnetic induction orientation silicon steel coil turn-ups, this method is through normalizing cooling, rolling, side cut, recoiling, continuous annealing, high temperature annealing, tensile annealing, laser nick and finishing shearing subpackage nine big processes preparation obtain high magnetic induction orientation silicon steel coil to control its turn-ups, its characterized in that:
1) normalizing and cooling: along the running direction of the steel strip, a normalized uniform cooling control technology is adopted, upper spray pipes and lower spray pipes are symmetrically distributed on the upper side and the lower side of the steel strip, the distance of the spray medium covering width direction is ensured to be 1.05-1.2 m, and nozzles are uniformly arranged on the upper spray pipes and the lower spray pipes, wherein the spray pressure is 0.3-0.4 Mpa, and the dosage of the cooling medium is 40m3/h～60m3/h；
2) Rolling: after the CP unit normalizing annealing is finished, rolling the hot rolled plate into a cold rolled sheet with the thickness of 0.08-0.30 mm by a twenty-high rolling mill, wherein the control value of the edge part of the target plate shape curve of 1 pass is 10-15I in the rolling process, and keeping wide rolling; the shape control adopts a quadratic control process to realize wide loose edge rolling, ensure the waviness to be below 2 percent, the number of the waves to be 6/meter and the wave height to be below 3mm, and avoid the cracking caused by rolling;
3) trimming: after the rolling process is finished, a steel coil with edge crack larger than or equal to 5mm is arranged on one side, and the steel coil is subjected to single-side edge cutting; the step avoids the burr control difficulty during trimming the two sides of the steel coil;
4) rewinding: when edge cracks with the thickness of more than or equal to 5mm exist on two sides, the overlap amount of a cutting edge is set according to the thickness of no more than 10% of the plate thickness during edge cutting, and the residual burrs after edge cutting of the high-magnetic induction oriented silicon steel with the thickness of 0.18 mm-0.30 mm series are controlled to be less than 20 mu;
5) and (3) continuous annealing: the misalignment amount during continuous annealing and coiling was controlled to 2 mm.
2. The method for controlling the flanging of the high-magnetic-induction oriented silicon steel coil according to claim 1, is characterized in that: in the step 1), 13 nozzles are arranged on the upper spray pipe, 14 nozzles are arranged on the lower spray pipe, and the rated flow of 4 nozzles at the end parts of two sides of each upper spray pipe and each lower spray pipe is 50-60% smaller than that of the rest nozzles.
3. The method for controlling the flanging of the high-magnetic-induction oriented silicon steel coil according to claim 1, is characterized in that: in the step 1), the sprayed cooling water is industrial filtered water, and the physical and chemical indexes are that the pH value is as follows: 7.2-8.2, SS: ave < 5.0mg/l, total hardness: 6.3-8.36 dH.
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