A method for processing deviation of cold-rolled strip steel

Abstract

The present invention discloses a method for processing deviation of cold-rolled strip steel. After first determining that deviation occurs at the head of the steel strip, the tension on the head of the steel strip is cancelled, and the clamping roller and the straightening machine are opened. At this time, the head of the steel strip is not affected by external force. Then, the deviated head of the steel strip is corrected by a centering device. Then, a power device is operated to drive the steel coil to perform a first reverse rotation, a forward rotation and a second reverse rotation in sequence. After the steel strip head is retreated and loosened, it is rotated onto the steel coil, thereby quickly eliminating the deviation of the steel strip head and the partial deviation of the steel strip on the outer ring of the steel coil, thereby realizing an efficient and fast processing method, greatly improving work efficiency, and reducing the speed reduction or downtime of the production line.

Description

Technical Field

[0001] The present application relates to the field of metallurgical processing technology, and in particular to a method for processing deviation of cold-rolled strip steel. Background Art

[0002] Currently, in the production process of the continuous rolling mill, when the strip is uncoiled in the entrance area, the strip will deviate at the entrance pinch rollers or straightening machine. The deviation will cause the edge of the strip to be scratched to varying degrees, and the time required to deal with the accident is long, which will also cause a large amount of waste.

[0003] In the environment of maintaining stability, reducing costs and increasing efficiency, it is imperative to break through the bottleneck of production lines and improve the ability of production lines to handle accidents. Summary of the invention

[0004] In view of the defects existing in the prior art, the present application provides a method for processing the deviation of cold-rolled strip steel, so as to solve the problem in the prior art that the steel strip needs to be decelerated and stopped after the steel strip deviates.

[0005] The above-mentioned purpose of the present invention is mainly achieved through the following technical solutions:

[0006] A method for processing deviation of cold-rolled strip steel, comprising:

[0007] Confirm that the steel strip head is offset;

[0008] Remove the tension on the steel strip head and open the pinch roller and straightening machine;

[0009] Correct the deflected steel strip head by the centering device;

[0010] Control the first reversal of the steel coil until the steel strip head retreats;

[0011] Control the steel coil to rotate forward until the steel coil becomes loose;

[0012] Control the steel coil to reverse for the second time until the steel strip head rotates onto the steel coil;

[0013] Thread the steel belt head.

[0014] Further, when it is confirmed that there is a deviation between the center line of the steel strip head and the rolling center line, it is confirmed that the steel strip head is offset.

[0015] Furthermore, the deviation is not less than 30 mm.

[0016] Furthermore, during the first reversal of the steel coil, the pinch rollers and the straightening machine remain pressed against the steel strip.

[0017] Further, after the driven steel coil is reversed for the first time, the straightening machine is opened.

[0018] Furthermore, when the steel coil is reversed for the first time, rotated forwardly, and reversed for the second time, the rotation speed of the steel coil is 30 m / min.

[0019] Furthermore, during the forward rotation of the steel coil, after observing that 1-2 turns of strip steel appear to be loose on the outer ring of the steel coil, the rotation of the steel coil is stopped.

[0020] Furthermore, the threading process of the steel strip head includes: operating the uncoiler to drive the steel coil forward by inching, and threading the steel strip head into the pinch roller and the straightening machine in turn, operating the pinch roller and the straightening machine to press down, and operating the anti-wrinkle roller until the steel strip has a tension of not less than 25KN.

[0021] Furthermore, the uncoiler is operated by inching to drive the steel coil to rotate continuously in the forward direction. When the steel strip head moves to the centering device, when the deviation between the center line of the steel strip head and the rolling center line is not less than 30 mm, the clamping rollers and the straightening machine are opened, and the centering device is repeatedly operated to clamp the steel strip head until the deviation between the center line of the steel strip head and the rolling center line is less than 30 mm.

[0022] Furthermore, after the steel strip is threaded, when scraping occurs in the width direction of the strip, the scraping is flattened or the strip in the scraping area is cut off by adjusting the parameters of the straightening machine.

[0023] Compared with the prior art, the advantages of the present invention are:

[0024] In actual application, the present invention first determines that the steel strip head is offset, then cancels the tension on the steel strip head, and opens the clamping roller and the straightening machine. At this time, the steel strip head is not affected by external force, and then the offset steel strip head is corrected by the centering device. Then, the power device is operated to drive the steel coil to perform the first reverse rotation, forward rotation and the second reverse rotation in sequence. After the steel strip head is retreated and loosened, it is rotated onto the steel coil, thereby quickly eliminating the offset of the steel strip head and the partial offset of the steel strip on the outer ring of the steel coil, thereby realizing an efficient and fast processing method, greatly improving work efficiency, and reducing the speed reduction or downtime of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic diagram of the equipment of the cold-rolled steel strip production line provided in the embodiment of the present application;

[0027] In the figure: 1. Steel coil; 2. Steel strip head; 3. Centering device; 4. Pinch roller; 5. Straightening machine; 6. Unwinder mandrel; 7. Strip threading guide; 8. Anti-wrinkle roller. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. The specific structures and functional details disclosed herein are only used to describe the exemplary embodiments of the present invention. However, the present invention can be embodied in many alternative forms, and it should not be understood that the present invention is limited to the embodiments set forth herein.

[0029] like Figure 1 As shown, a method for processing deviation of cold-rolled strip steel comprises:

[0030] Confirm that the steel strip head 2 is offset. Specifically, a rule can be set that whenever there is a deviation between the center line of the steel strip head 2 and the rolling center line, it can be determined that the steel strip head 2 is offset.

[0031] During the actual processing and production process, the moving extension direction of the steel strip head 2 is the same as the extension direction of the rolling center line. As the steel strip head 2 moves, the deviation between the center line of the steel strip head 2 and the rolling center line can be intuitively compared. In order to enable the operator to observe the deviation more intuitively, a clearly visible reference line can be marked on the moving path of the steel strip head 2, and the reference line coincides with the rolling center line in the projection on the width extension plane at the steel strip head 2; at the same time, optionally or simultaneously, a comparison line can be marked at the steel strip head 2, and the comparison line coincides with the rolling center line in the projection on the width extension plane at the steel strip head 2.

[0032] The tension on the steel strip head 2 is cancelled, and the pinch roller 4 and the straightening machine 5 are turned on. After the pinch roller 4 is turned on, the pinch roller 4 does not apply external force to the steel coil 1. After the straightening machine 5 is turned on, the steel coil 1 is not subjected to the clamping force of the straightening machine 5. The tension on the steel coil 1 can be determined to be 0 KN.

[0033] When canceling the tension on the steel strip head 2, the tension of the uncoiler can be removed first. At this time, when it is determined that the tension of the steel coil 1 is 0KN, the anti-wrinkle roller 8 is pressed down, and the clamping roller 4 and the straightening machine 5 are operated to open, so that the steel coil 1 can be driven to rotate forward or reverse, and the ends of the steel strip head 2 are not restricted in a fixed position.

[0034] The offset steel strip head 2 is corrected by the centering device 3. After the correction by the centering device 3, the center line of the steel strip head 2 can be made to coincide with the rolling center line. No matter which side of the steel strip head 2 in its width direction is offset, it can be corrected by the centering device 3 and the steel strip head 2 can be kept centered.

[0035] The steel coil 1 is driven to reverse for the first time until the steel strip head 2 retreats.

[0036] It is worth mentioning that when the steel coil 1 is rotating, when the steel strip head 2 is driven to move toward the straightening machine 5, the rotation direction of the steel coil 1 in this state is defined as forward rotation. When the steel coil 1 is driven to reverse, the steel strip head 2 that is unfolded and sent out is wound on the steel coil 1 again while the steel coil 1 reverses. In the actual processing and production process, no matter in which direction the steel coil 1 rotates, it is defined as forward rotation and reverse rotation, the corresponding purpose of recovering the steel strip head 2 to the steel coil 1 can be achieved.

[0037] After the steel strip head 2 retreats a certain distance, the steel coil 1 is driven to rotate forward. The forward rotation here refers to the description of the first reversal mentioned above, and is opposite to the direction of the first reversal, until the steel coil 1 becomes loose, specifically, the outer ring of the steel coil 1 becomes loose.

[0038] After the outer ring of the steel coil 1 is loosened, the steel coil 1 is driven to reverse for the second time. The forward rotation here refers to the description of the first reversal above, and the direction is the same as the first reversal, until the steel strip head 2 rotates onto the steel coil 1.

[0039] At this point, the offset portion of the steel coil 1 has been processed and corrected, and the steel strip head 2 can be directly threaded and the subsequent production and processing procedures can be started.

[0040] Because the steel strip head 2 is corrected to the center position under the action of the centering device 3, that is, at this time, there is no offset at the steel strip head 2, but there is a certain offset between the steel coil 1 and the steel strip at the steel strip head 2. After the steel coil 1 retreats a certain distance, the outer ring of the steel coil 1 is loosened by driving the steel coil 1 to rotate forward. Even if the offset strip steel wrapped around the steel coil 1 will have tension canceled during the loosening process, after the outer ring of the steel coil 1 is loosened, one end of the offset section of the strip steel is at the steel strip head 2, that is, the corrected steel strip head 2, and the other end of the offset section of the strip steel is the end of the steel coil 1 that has not been offset, and the offset section of the strip steel is not affected by external force, then the offset section of the strip steel can restore the deviation. It is worth noting that the number of loose circles of the outer ring of the steel coil 1 can be selected according to the length of the offset section of the strip steel, that is, the strip steel is driven to rotate forward until the offset section of the strip steel is not wrapped around the steel coil 1.

[0041] In actual production operations, after the driven steel coil 1 completes the second reversal, the anti-wrinkle roller 8 can be pressed down onto the steel belt to ensure that tension can be applied to the steel belt after the steel belt is threaded.

[0042] After eliminating the deviation of the steel strip, the steel coil 1 is driven to reverse for the second time, and the unwinding part and the steel strip head 2 are wound around the steel coil 1 again, so as to facilitate the subsequent threading and processing operations of the steel strip head 2.

[0043] When the steel strip head 2 is threaded, the threading guide plate 7 may be extended toward the steel strip head 2 to facilitate the pulling and threading of the steel strip head 2 .

[0044] The principle of this embodiment is: in actual use, after determining that the steel strip head 2 is offset, the tension on the steel strip head 2 is canceled, and the clamping roller 4 and the straightening machine 5 are opened. At this time, the steel strip head 2 is not affected by external force, and then the offset steel strip head 2 is corrected by the centering device 3, and then the steel coil 1 is driven by the operating power device to perform the first reverse rotation, forward rotation and second reverse rotation in sequence. After the steel strip head 2 is retreated and loosened, it is rotated to the steel coil 1, and then the offset of the steel strip head 2 and the partial steel strip offset existing in the outer ring of the steel coil 1 are quickly eliminated, thereby realizing an efficient and fast processing method, greatly improving work efficiency, and reducing the speed reduction or downtime of the production line.

[0045] Further, on the basis of the above embodiment, in order to meet the actual production requirements and the margin allowed by production, the deviation is not less than 30 mm.

[0046] Furthermore, on the basis of the above-mentioned embodiment, during the first reversal of the steel coil 1, the clamping roller 4 and the straightening machine 5 remain pressed on the steel strip, thereby keeping the steel strip head 2 in the corrected state during the retraction process, that is, the center line of the steel strip head 2 always maintains no deviation from the rolling center line during the retraction process.

[0047] Further, on the basis of the above embodiment, after the steel coil 1 is driven to reverse for the first time, the straightening machine 5 is opened, that is, after the steel strip head 2 retreats a certain distance, the straightening machine 5 is separated from the steel strip.

[0048] Further, based on the above embodiment, the rotation speed of the steel coil 1 is 30m / min during the first reverse rotation, forward rotation and second reverse rotation, and is controlled by inching. Inching means that one or more devices can be selected individually to facilitate speed control.

[0049] Further, on the basis of the above embodiment, during the forward rotation process of the steel coil 1, after observing that 1-2 turns of the strip steel on the outer ring of the steel coil 1 are loose, the rotation of the steel coil 1 is stopped.

[0050] Furthermore, on the basis of the above-mentioned embodiment, the threading process of the steel strip head 2 includes: operating the uncoiler by inching, driving the steel coil 1 to rotate forward through the uncoiler core shaft 6, and successively inserting the steel strip head 2 into the clamping roller 4 and the straightening machine 5, operating the clamping roller 4 and the straightening machine 5 to press down, and operating the anti-wrinkle roller 8 until the steel strip has a tension of not less than 25KN.

[0051] Furthermore, on the basis of the above embodiment, the uncoiler is operated by jogging, and the steel coil 1 is driven to continuously rotate forward by the uncoiler core shaft 6. When the steel strip head 2 moves to the centering device 3, when the deviation between the center line of the steel strip head 2 and the rolling center line is not less than 30 mm, the clamping roller 4 and the straightening machine 5 are opened, and the centering device 3 is repeatedly operated to clamp the steel strip head 2 until the deviation between the center line of the steel strip head 2 and the rolling center line is less than 30 mm.

[0052] The centering device 3 can be two linked clamps, and the two clamps move toward or away from each other at the same time. The two clamps are symmetrically arranged along the rolling center line. When the two clamps are moving, the distance between the two clamps and the rolling center line is always kept the same. When the offset state of the steel strip head 2 is biased towards one of the clamps, the offset steel strip head 2 is corrected in the process of the two clamps approaching each other at the same time.

[0053] Further, based on the above embodiment, after the steel strip head 2 is threaded, when scraping occurs in the width direction of the strip, the scraping is flattened or the strip in the scraping area is cut off by adjusting the parameters of the straightening machine 5 .

[0054] Specifically, during the operation, there are several different degrees of scraping treatment methods:

[0055] (1) Light scraping

[0056] When the steel strip is observed to be bent to a height of no more than 15 mm along the width direction and a bending angle of no more than 45°, and no edge cracks occur, the parameters of the straightening machine 5 can be reduced to within the range of 2.0-3.5 mm, and the bent portion can be flattened using the downward pressure of the straightening machine 5 to reduce unnecessary scrap removal.

[0057] (2) Moderate scraping

[0058] When edge cracks are observed on the steel strip and the cracks are no larger than 6mm, first confirm whether the next process of the steel coil 1 is trimming material and the single-side trimming amount of the steel strip. If the next process of the steel coil 1 is trimming material and the single-side trimming amount of the steel strip should be no less than 8mm, the scraping defect can be directly taken to the next process for cutting. This method can save processing time and improve the yield rate.

[0059] (3) Heavy scraping

[0060] When edge cracks are observed on the steel strip, and if the edge cracks are larger than 6mm, the scraped edge part of the steel strip shall be cut off first, and then it shall be confirmed whether the subsequent part of the strip has any signs of deviation. The basis for judging whether there are signs of deviation is the offset between the single side of the outer ring steel strip of steel coil 1 and the end of steel coil 1, and the offset shall be not less than 20mm. If serious sickle bend occurs within 220m from the head of the steel strip, in order to avoid deviation again during the process of sending the head of the steel strip to the welding machine, the sickle bend section defect of the steel strip shall be completely removed at the slitting shear.

[0061] It should be understood that the terms first, second, etc. are only used to distinguish descriptions and should not be understood as indicating or suggesting relative importance. Although the terms first, second, etc. may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another unit. For example, the first unit may be referred to as the second unit, and similarly, the second unit may be referred to as the first unit without departing from the scope of the exemplary embodiments of the present invention.

[0062] It should be understood that the term "and / or" in this article is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" in this article describes another relationship between associated objects, indicating that two relationships may exist. For example, A / and B can represent two situations: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0063] It should be understood that in the description of the present invention, the terms "upper", "vertical", "inside", "outside" and the like indicate orientations or positional relationships that are customarily placed when the disclosed product is used, or are orientations or positional relationships that are customarily understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0064] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] The terms used herein are only used to describe specific embodiments and are not intended to limit the exemplary embodiments of the present invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates the opposite meaning. It should also be understood that the terms "include", "comprising", "including", and / or "comprising" when used herein specify the existence of the claimed features, integers, steps, operations, units, and / or components, and do not exclude the existence or increase of one or more other features, quantities, steps, operations, units, components, and / or their combinations.

[0066] Specific details are provided in the following description to facilitate a complete understanding of the exemplary embodiments. However, it should be understood by those of ordinary skill in the art that the exemplary embodiments may be implemented without these specific details. In other embodiments, well-known processes, structures, and techniques may not be shown in unnecessary detail to avoid making the exemplary embodiments unclear.

[0067] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for treating deviation of cold-rolled strip, characterized in that: It includes: Confirm that the steel strip head is offset; Remove the tension on the steel strip head and open the pinch roller and straightening machine; Correct the deflected steel strip head by the centering device; Control the first reversal of the steel coil, and keep the pinch roller and the straightening machine pressed on the steel strip until the head of the steel strip retreats and the straightening machine opens; Control the steel coil to rotate forward until the steel coil becomes loose; Control the steel coil to reverse for the second time until the steel strip head rotates onto the steel coil; Thread the steel belt head.

2. The method for treating the deviation of cold-rolled strip according to claim 1, characterized in that: When it is confirmed that there is a deviation between the center line of the steel strip head and the rolling center line, it is confirmed that the steel strip head is offset.

3. The method for treating deviation of cold-rolled strip according to claim 2, characterized in that: The deviation is not less than 30 mm.

4. The method for treating deviation of cold-rolled strip according to claim 1, characterized in that: When the steel coil is reversed for the first time, rotated forwardly and reversed for the second time, the rotation speed of the steel coil is 30m / min.

5. The method for treating deviation of cold-rolled strip according to claim 1, characterized in that: During the forward rotation of the steel coil, stop rotating the steel coil after observing that 1-2 turns of strip steel appear to be loose on the outer ring of the steel coil.

6. The method for treating deviation of cold-rolled strip according to claim 1, characterized in that: The threading process of the steel strip head includes: operating the uncoiler to drive the steel coil forward, and threading the steel strip head into the pinch roller and the straightening machine in turn, operating the pinch roller and the straightening machine to press down, and operating the anti-wrinkle roller until the steel strip has a tension of not less than 25KN.

7. The method for treating deviation of cold-rolled strip according to claim 6, characterized in that: The uncoiler is operated by inching to drive the steel coil to rotate continuously in the forward direction. When the steel strip head moves to the centering device, when the deviation between the center line of the steel strip head and the rolling center line is not less than 30 mm, open the clamping roller and the straightening machine, and repeatedly operate the centering device to clamp the steel strip head until the deviation between the center line of the steel strip head and the rolling center line is less than 30 mm.

8. The method for treating deviation of cold-rolled strip according to claim 1, characterized in that: After the steel strip is threaded, when scraping occurs in the width direction of the strip, the scraping is flattened or the strip in the scraping area is cut off by adjusting the parameters of the straightening machine.

Images