A strip steel rolling method

Abstract

The present invention discloses a strip steel rolling method, which belongs to the technical field of metal material processing, and solves the technical problem that the existing rolling method is inefficient in processing defects on the strip steel. A strip steel rolling method comprises the following steps: judging whether the strip steel has defects; providing a reversible rolling mill, wherein the two rolling directions of the reversible rolling mill are respectively the first rolling direction and the second rolling direction, and the sections with defects on the strip steel are the defective sections, and the sections without defects on the strip steel are the complete sections; rolling the strip steel, and rolling each complete section alternately in the first rolling direction and the second rolling direction until the rolling pass reaches the target pass. The present application reduces the number of roll changes and the number of reciprocating rolling passes, shortens the rolling time of defective strip steel, and reduces the workload of operators.

Description

Technical Field

[0001] The invention belongs to the technical field of metal material processing, and in particular relates to a strip steel rolling method. Background Art

[0002] When a single-stand reversible rolling mill produces strip steel, if there are certain defects such as scars, holes, etc. in the middle part (in the length direction) of the rolled strip steel, and such defects cannot be rolled, the general method is: cutting the strip steel near the defect, dividing the strip steel into two sub-rolls, avoiding the defective part, and rolling them separately. This method is a conventional split-roll rolling method. Since one steel coil is divided into two sub-rolls, auxiliary operations such as coiling, centering, strip threading, and roll changing are required twice, and the number of reciprocating rolling passes is twice the original, the production time is long, and the workload of the operator is increased. Summary of the invention

[0003] The present application aims to at least to some extent solve the technical problem of low efficiency of existing rolling methods in processing defects on strip steel. To this end, the present application provides a strip steel rolling method.

[0004] The technical solution of this application is as follows:

[0005] A strip steel rolling method comprises the following steps:

[0006] Determine whether the strip has defects;

[0007] A reversible rolling mill is provided, and a steel strip is arranged on the reversible rolling mill, wherein the two rolling directions of the reversible rolling mill are respectively a first rolling direction and a second rolling direction, and a section on the steel strip having defects is a defective section, and a section on the steel strip having no defects is a complete section;

[0008] The strip is rolled, a complete section is rolled alternately in a first rolling direction and a second rolling direction until the rolling passes reach a target number, the position of the defective section is adjusted so that another complete section of the strip is located on the roll of the reversible rolling mill, and another complete section is rolled alternately in the first rolling direction and the second rolling direction until the rolling passes reach the target number.

[0009] In some embodiments, in the step of determining whether the steel strip has defects, if the steel strip has no defects, the reversible rolling mill does not stop.

[0010] In some embodiments, in the step of determining whether the steel strip has defects, if the steel strip has two or more defects, then in the step of rolling the steel strip, a plurality of the complete sections are rolled sequentially along the length direction of the steel strip.

[0011] In some embodiments, before the step of rolling the steel strip, the method further comprises:

[0012] Determine whether the required number of passes is an odd number of passes or an even number of passes;

[0013] If the required pass is an even number, each of the complete sections is rolled in sequence along the first direction until the rolling pass reaches the first target pass, and each of the complete sections is rolled in sequence along the second direction until the rolling pass reaches the second target pass;

[0014] Wherein, the first direction and the second direction are both located in the length direction of the strip on the reversing rolling mill, and the first direction is opposite to the second direction;

[0015] The first target pass is an odd-numbered pass, and the sum of the first target pass and the second target pass is the required pass.

[0016] In some embodiments, the second target rolling pass is one rolling pass.

[0017] In some embodiments, if the required number of passes is an odd number of passes, each of the complete segments is rolled sequentially along the first direction until the rolling passes reach the required number of passes.

[0018] In some embodiments, during the step of rolling the steel strip, image data of the surface of the steel strip is acquired in real time.

[0019] In some embodiments, the step of providing a reversible rolling mill further includes providing an image acquisition device, wherein the image acquisition device is disposed on a frame of the reversible rolling mill.

[0020] In some embodiments, in the step of providing an image acquisition device, a controller is also provided, wherein the controller is connected to the image acquisition device and can drive the lifting and lowering of the rollers on the frame of the reversible rolling mill.

[0021] In some embodiments, the controller may shut down and / or start up the reversing mill.

[0022] The embodiments of the present application have at least the following beneficial effects:

[0023] It can be seen from the above technical scheme that the strip rolling method disclosed in the present invention performs multiple passes of rolling on the strip without cutting the strip, and the entire rolling process only requires one auxiliary operation such as coiling, centering, and threading, which correspondingly reduces the number of roll changes and the number of reciprocating rolling passes, shortens the rolling time of defective strips, improves rolling efficiency, and reduces the workload of operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic diagram of the process of a strip steel rolling method in an embodiment of the present application is shown;

[0026] Figure 2-Figure 9 The rolling process of a steel strip in an embodiment of the present application is shown;

[0027] Figure 10-12 Another strip steel rolling process in an embodiment of the present application is shown;

[0028] Markings in the figure: 1-left coiler, 2-right coiler, 3-roller, 4-defect. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0030] In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.

[0031] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0032] like Figure 1 As shown, this embodiment provides a strip steel rolling method, comprising the following steps:

[0033] Step 1: Determine whether the strip has defects.

[0034] Specifically, it is possible to determine whether the steel strip has defects by collecting images during the production process. If the judgment result is that the steel strip has no defects, or the defects on the steel strip can be rolled, the steel strip can be directly rolled using the existing rolling mill on the production line.

[0035] Step 2: Provide a reversible rolling mill, set the strip on the reversible rolling mill, with the two rolling directions of the reversible rolling mill being the first rolling direction and the second rolling direction respectively, and the defective section on the strip being the defective section, and the section without defects on the strip being the complete section.

[0036] If the result of the judgment is that the steel strip has defects that cannot be rolled, a reversible rolling mill is provided, and the steel strip is rolled by utilizing the characteristic of the reversible rolling mill that can be rolled forward and backward. A coiler is respectively provided at the head end and the tail end of the reversible rolling mill, and the two coilers are respectively used to roll the steel strip to form a steel coil. The line between the head end and the tail end of the reversible rolling mill is the rolling direction of the reversible rolling mill, and the first rolling direction is opposite to the second rolling direction. At least one set of rollers is provided on the frame of the reversible rolling mill, and the steel strip passes through the gap between the two rollers, and the frame can control the gap between the two rollers. Of course, steel strips without defects can also be rolled using the reversible rolling mill, and the reversible rolling mill does not stop during the rolling process.

[0037] Step 3: Roll the strip, alternately roll a complete section in the first rolling direction and the second rolling direction until the rolling pass reaches the target pass, adjust the position of the defective section so that another complete section of the strip is located on the roll of the reversible rolling mill, and alternately roll another complete section in the first rolling direction and the second rolling direction until the rolling pass reaches the target pass.

[0038] It can be understood that in step 3, during the rolling of the steel strip, the roll gap of the reversible rolling mill is adjustable, so that the rolling process skips the defective section of the steel strip and continues to roll the complete section of the steel strip. The roll gap can be adjusted based on the image of the steel strip obtained by the acquisition so that the defective section leaves the rolling area of ​​the reversible rolling mill, or when to adjust the roll gap can be determined by the operator. Among them, rolling once in the first rolling direction or the second rolling direction is called a pass.

[0039] Compared with the existing method of shearing near the defect, the rolling method of this embodiment does not roll the defect of the strip, nor does it need to perform shearing operations, and further does not need to perform auxiliary operations such as coiling, centering, strip threading, and roll changing again, which undoubtedly greatly reduces the degree of backseat in the rolling process and improves the efficiency of rolling the strip. Moreover, by rolling a single complete section in the forward and reverse directions of the reversible rolling mill, the rolling of the next complete section can be carried out after the rolling pass of a single complete section on the strip meets the demand, without skipping the defective section multiple times, and the rolling efficiency of the strip with defects can be further improved.

[0040] In step 1, if there is only one defect on the strip, the strip has one defective section and two complete sections, and the defective section is located between the two complete sections. During the rolling process, after one complete section is rolled according to the required pass, the other complete section can be rolled. The required pass is the pass that the strip needs to be rolled. It should be noted that if the defect exists at the head or tail of the strip, the reversible rolling mill adjusts the reversible rolling mill during the rolling process.

[0041] If the steel coil has more than two defects, considering that the strip is long and linear, step 3 also includes rolling multiple complete sections in sequence along the length direction of the strip to improve rolling efficiency.

[0042] Before step 3, the method further includes step 300: determining whether the required pass number is an odd pass number or an even pass number.

[0043] If the required pass is an odd number, each complete section is rolled in sequence along the first direction until the rolling pass reaches the required pass, that is, the target pass is equal to the required pass. It can be understood that the rolling process for a single complete section includes n rolling passes in the first rolling direction and n-1 rolling passes in the second rolling direction, and the strip is rolled from the head of the strip. After the single complete section is rolled for an odd number of passes, the roll of the reversible mill is just located in front of the defective section. The roll gap of the reversible mill is adjusted, and the reversible mill keeps running in the first rolling direction, so that the defective section can be quickly moved out of the rolling area of ​​the reversible mill, and the rolling efficiency is high.

[0044] If the required pass is an even number, each complete section is rolled in sequence along the first direction until the rolling pass reaches the first target pass, and then each complete section is rolled in sequence along the second direction until the rolling pass reaches the second target pass; wherein the first direction and the second direction are both located in the length direction of the strip on the reversible rolling mill, and the first direction is opposite to the second direction; the first target pass is an odd number, and the sum of the first target pass and the second target pass is the required pass.

[0045] It can be understood that the complete segments on the strip are rolled in the first direction in sequence, and each rolling operation is an odd-numbered pass. This makes it possible that after the rolling is completed according to the first target pass, the rollers of the reversible rolling mill are just located in front of the defective segment, and the running direction of the strip is just such that the reversible rolling mill can quickly remove the defective segment without changing the rolling direction. After all the complete segments on the strip are rolled for the first target pass, the second rolling operation is performed in the second direction starting from the tail of the strip. Since the required pass is an even-numbered pass, when the first target pass is an odd-numbered pass, the second target pass level is an odd-numbered pass, thereby allowing the second rolling operation to run quickly. In the case where the length of the complete segment on the strip is long, making each rolling of the complete segment an odd-numbered pass can effectively reduce the situation where the reversible rolling mill drives the strip to run idly, improve rolling efficiency, and reduce energy consumption during operation. In this embodiment, the rolling pass of the second target pass is one time, which is convenient for operation.

[0046] Step 3 also includes step 301: acquiring image data of the strip surface in real time during the rolling process. Specifically, there may be hidden defects on the surface of the strip. During the rolling process of multiple passes, the hidden defects appear. Generally speaking, such defects also exist as unrollable defects. Therefore, by acquiring image data of the strip surface in real time, the defect data of the strip can be judged more accurately, which is beneficial to the rolling of defective strip.

[0047] Therefore, in step 2, this embodiment also provides an image acquisition device and a controller, and the image acquisition device is arranged on the frame of the reversible rolling mill to obtain information on whether there are non-rollable defects on the surface of the strip, and the type of non-rollable defects can be set according to the operation requirements. The controller is connected to the image acquisition device, and the controller can drive the lifting and lowering of the rollers on the frame of the reversible rolling mill. When the image acquisition device acquires and identifies non-rollable defects on the strip, the controller will drive the two rollers working together to separate, and the defective section will pass through the area where the rollers are located without stopping the coiler, so as to further improve the operation efficiency and reduce the operation difficulty of the operator. Of course, the controller can shut down and / or start the reversible rolling mill. Specifically, when the controller determines that the defects on the surface of the strip acquired by the image acquisition device are too large, and the two rollers are too late to separate, the controller can directly shut down the reversible rolling mill and the coiler matched with the mill to avoid the defects from damaging the roller surface.

[0048] Reference Figure 2-Figure 9 This embodiment provides a specific rolling method, wherein there is only one defect 4 on the strip a, the required number of passes is three, the two coilers are respectively a left coiler 1 and a right coiler 2, the direction from the left coiler 1 to the right coiler 2 is the first direction, the steel coil formed by the strip is rolled up to the left coiler 1, and the strip is threaded, referring to Figure 2, at this time, defect 4 is located on the steel coil of the left coiler 1; refer to Figure 3 , drive the reversible rolling mill to roll the strip a along the first direction. After the first complete section is rolled, refer to Figure 4 , drive the reversible rolling mill to roll the strip a along the second direction. After the second rolling of the first complete section is completed, refer to Figure 5 , driving the reversible rolling mill to roll the strip a in the first direction to complete the three-pass rolling of the first complete section, referring to Figure 6 , open the gap between the two rolls 3, move the defective section to the right coiler 2, and allow the second complete section to enter the rolling interval. Figure 7 , drive the reversible rolling mill to roll the strip a along the first direction, after the second complete section of the rolling is completed, refer to Figure 8 , drive the reversible rolling mill to roll the strip a along the second direction. After the second pass rolling of the second complete section is completed, refer to Fig. 9 , drive the reversible rolling mill to roll the strip a along the first direction to complete the three-pass rolling of the second complete section. At this point, the strip a is rolled except for the defective section, and the coil unloading operation can be carried out, and the defective section can be cut off or welded in other units.

[0049] This embodiment also provides another specific rolling method, in which there is only one defect 4 on the strip steel b, and the required number of passes is four. Figure 2-Figure 9 After completing the three-pass rolling of two complete sections of strip steel b, defect 4 is now on the strip steel on the right coiler 2. Fig.10 , driving the reversible rolling mill to roll a complete section of strip b in the second direction for the fourth pass, referring to Fig.11 , open the gap between the two rolls 3, move the defective section to the left coiler 1, and allow the other complete section to enter the rolling interval, refer to Fig.12 , drive the reversible rolling mill to roll another complete section of strip b along the second direction for the fourth pass, thus completing the four-pass rolling of strip b. After completion, the coil unloading operation can be carried out, and defective sections can be cut off or welding can be performed in other units.

[0050] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0051] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element 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 application.

[0052] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0053] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0054] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0056] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0057] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A strip steel rolling method, characterized in that: The following steps are involved: Determine whether the strip has defects; A reversible rolling mill is provided, and a steel strip is arranged on the reversible rolling mill, wherein the two rolling directions of the reversible rolling mill are respectively a first rolling direction and a second rolling direction, and a section on the steel strip having defects is a defective section, and a section on the steel strip having no defects is a complete section; Determine whether the required pass is an odd pass or an even pass; if the required pass is an even pass, then sequentially roll each of the complete sections along the first direction until the rolling pass reaches a first target pass, and then sequentially roll each of the complete sections along the second direction until the rolling pass reaches a second target pass; wherein the first direction and the second direction are both located in the length direction of the strip on the reversible rolling mill, and the first direction is opposite to the second direction; the first target pass is an odd pass, and the sum of the first target pass and the second target pass is the required pass; The strip is rolled, a complete section is rolled alternately in a first rolling direction and a second rolling direction until the rolling passes reach a target pass, and the adjustable roll gap feature of the reversible rolling mill is utilized so that after the rolling process skips over the defective section of the strip, another complete section of the strip is positioned on the rolls of the reversible rolling mill, and another complete section is rolled alternately in the first rolling direction and the second rolling direction until the rolling passes reach the target pass.

2. The strip rolling method according to claim 1, characterized in that: In the step of judging whether the steel strip has defects, if the steel strip has no defects, the reversible rolling mill does not stop.

3. The strip rolling method according to claim 1, characterized in that: In the step of judging whether the steel strip has defects, if the steel strip has two or more defects, then in the step of rolling the steel strip, a plurality of the complete sections are rolled sequentially along the length direction of the steel strip.

4. The strip rolling method according to claim 1, characterized in that: The second target rolling pass is one time.

5. The strip rolling method according to claim 1, characterized in that: If the required number of passes is an odd number of passes, each of the complete sections is rolled sequentially along the first direction until the rolling number of passes reaches the required number of passes.

6. The strip rolling method according to claim 1, characterized in that: In the step of rolling the steel strip, image data of the surface of the steel strip is acquired in real time.

7. The strip rolling method according to claim 1, characterized in that: The step of providing a reversible rolling mill also includes providing an image acquisition device, which is arranged on the frame of the reversible rolling mill.

8. The strip rolling method according to claim 7, characterized in that: In the step of providing an image acquisition device, the step also includes providing a controller, which is connected to the image acquisition device and can drive the lifting and lowering of the rollers on the frame of the reversible rolling mill.

9. The strip rolling method according to claim 8, characterized in that: The controller may shut down and / or start up the reversing mill.

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