Intermediate roll and rolling mill

Abstract

This application belongs to the field of metal forming technology, and particularly relates to intermediate rolls and rolling mills. This application discloses an intermediate roll including a working section comprising a first conical section, a second conical section, and a flat roll section arranged sequentially along the axial direction. The diameters of both the first and second conical sections gradually decrease in the direction away from the flat roll section. The maximum diameter of the first conical section is smaller than the maximum diameter of the second conical section, and the slope of the second conical section is smaller than the slope of the first conical section. This application also discloses a rolling mill including a work roll and the aforementioned intermediate roll. At least two work rolls are symmetrically arranged relative to a first plane, and at least a portion of the working section abuts against the work rolls. The intermediate roll disclosed in this application, through the sequential arrangement of the first and second conical sections, causes the slope of the intermediate roll to gradually increase in the direction away from the flat roll section, thereby gradually widening the roll gap between the intermediate roll and the work roll, improving the uneven internal stress remaining in the sheet metal, and thus reducing diagonal stripe defects in the sheet metal.

Description

Technical Field

[0001] This application belongs to the field of metal forming technology, and particularly relates to intermediate rolls and rolling mills. Background Technology

[0002] Diagonal stripe defects have always been a common challenge in rolling mill shape control. Traditional shape adjustment mechanisms and control systems can only regulate conventional shape defects, and there are no effective measures for controlling diagonal stripe defects. Conventional process adjustment methods are limited and do not significantly improve diagonal stripe defects. Adjusting the rolling mill's precision is fundamental to equipment operation, but it can only prevent the diagonal stripe defect from worsening, not effectively improve it.

[0003] Because there are no bearing seats to fix the working rolls on the rolling mill, the working rolls will move around due to the combined effect of the squeezing of the intermediate rolls and their own thermal expansion during the rolling process, which will squeeze the plate and produce diagonal stripes on both sides of the plate, seriously affecting the plate quality and yield. Summary of the Invention

[0004] This application provides an intermediate roller that can reduce diagonal stripe defects in the sheet material.

[0005] This application provides an intermediate roller, including a working part, which includes a first cone, a second cone, and a flat roller arranged sequentially along the axial direction. The diameters of the first cone and the second cone gradually decrease in the direction away from the flat roller. The maximum diameter of the first cone is smaller than the maximum diameter of the second cone, and the slope of the second cone is smaller than the slope of the first cone.

[0006] According to the first aspect of the present application, the working part further includes a transition part located between the second cone part and the flat roller part. The diameter of the transition part gradually decreases in the direction away from the flat roller part. The maximum diameter of the second cone part is smaller than the maximum diameter of the transition part, and the slope of the transition part is smaller than the slope of the second cone part.

[0007] According to the embodiment of the first aspect of this application, the length of the transition portion in the axial direction is greater than or equal to 200 mm and less than or equal to 250 mm, and the maximum radius difference of the transition portion is greater than or equal to 0.02 mm and less than or equal to 0.04 mm.

[0008] According to the embodiment of the first aspect of this application, the length of the first cone in the axial direction is greater than or equal to 400 mm and less than or equal to 430 mm, and the maximum radius difference of the first cone is greater than or equal to 0.7 mm and less than or equal to 0.9 mm.

[0009] According to the embodiment of the first aspect of this application, the length of the second cone in the axial direction is greater than or equal to 120 mm and less than or equal to 130 mm, and the maximum radius difference of the second cone is greater than or equal to 0.02 mm and less than or equal to 0.04 mm.

[0010] According to an embodiment of the first aspect of this application, the length of the flat roller portion in the axial direction is greater than or equal to 910 mm and less than or equal to 1000 mm.

[0011] According to the first aspect of the present application, it further includes a bearing portion located on both sides of the working portion in the axial direction, and a bearing seat is sleeved on the bearing portion.

[0012] On the other hand, embodiments of this application also provide a rolling mill, including a work roll and an intermediate roll as described above, wherein at least two work rolls are symmetrically arranged with respect to a first plane, and at least a portion of the working part abuts against the work roll.

[0013] According to an embodiment of the second aspect of this application, the intermediate roller includes a first intermediate roller and a second intermediate roller, which are located on different sides of a first plane. The first cone, the second cone, and the flat roller on the first intermediate roller are arranged sequentially along a first direction, and the first cone, the second cone, and the flat roller on the second intermediate roller are arranged sequentially along a second direction, wherein the first direction is opposite to the second direction.

[0014] The intermediate roller of this application embodiment includes a working part, which includes a first cone, a second cone, and a flat roller arranged sequentially along the axial direction. The diameters of the first cone and the second cone gradually decrease in the direction away from the flat roller. The diameter of the first cone is smaller than that of the second cone, and the slope of the second cone is smaller than that of the first cone. By arranging the first cone and the second cone in sequence, the slope of the intermediate roller gradually increases in the direction away from the flat roller, thereby gradually widening the gap between the intermediate roller and the working roller. This reduces the uneven extrusion of the sheet metal by the working roller, facilitates the outward flow of metal, improves the residual uneven internal stress of the sheet metal, and thus reduces the diagonal stripe defects of the sheet metal, improving the quality and yield of the product. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a front view structural diagram of the intermediate roller in some embodiments of this application;

[0017] Figure 2 An example is shown. Figure 1 A partially enlarged schematic diagram of the intermediate roller;

[0018] Figure 3 A front view schematic diagram of an example rolling mill and sheet metal is shown.

[0019] Figure label:

[0020] 100, Intermediate roll; 101, First intermediate roll; 102, Second intermediate roll; 200, Work roll; 300, Plate;

[0021] 10. Working section; 11. First cone section; 12. Second cone section; 13. Flat roller section; 14. Transition section;

[0022] 20. Load-bearing component; 21. Bearing housing;

[0023] x, the axial direction of the intermediate roller (first direction); y, the second direction; z, the first plane. Detailed Implementation

[0024] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0026] The applicant found that in existing technologies, traditional sheet shape control mechanisms and systems can only regulate conventional sheet shape defects, and there are no effective measures for controlling diagonal stripe defects in rolling mills. Conventional process adjustment methods are limited and do not significantly improve diagonal stripe defects. Adjusting the rolling mill precision is fundamental to equipment operation, but it can only prevent the diagonal stripe defect from worsening, not effectively improve it. Because there are no bearing seats to fix the work rolls in the rolling mill, the work rolls are subjected to the combined effects of compression from the intermediate rolls and their own thermal expansion during rolling, causing them to shift and compress the sheet material, producing diagonal stripes on both sides of the sheet, severely affecting sheet quality and yield.

[0027] In view of the above problems, the applicant proposes an intermediate roller, including a working part, which includes a first cone, a second cone, and a flat roller arranged sequentially along the axial direction. The diameters of the first cone and the second cone gradually decrease in the direction away from the flat roller. The diameter of the first cone is smaller than that of the second cone, and the slope of the second cone is smaller than that of the first cone.

[0028] The intermediate roller provided in this application includes a working section, which comprises a first cone, a second cone, and a flat roller arranged sequentially along the axial direction. The diameters of the first cone and the second cone gradually decrease in the direction away from the flat roller. The diameter of the first cone is smaller than that of the second cone, and the slope of the second cone is smaller than that of the first cone. Through the sequential arrangement of the first cone and the second cone, the slope of the intermediate roller gradually increases in the direction away from the flat roller, thereby gradually widening the gap between the intermediate roller and the working roller. This reduces the uneven extrusion of the sheet metal by the working roller, facilitates the outward flow of metal, improves the residual uneven internal stress of the sheet metal, and thus reduces the diagonal stripe defects of the sheet metal, improving product quality and yield.

[0029] The display module provided in the embodiments of this application will now be described with reference to the accompanying drawings. It should be noted that the x-direction in the drawings refers to the first direction and the axial direction of the intermediate roller, and the y-direction refers to the second direction. In the drawings, for ease of drawing, the dimensions are not necessarily proportional to the actual dimensions.

[0030] Please refer to Figure 1 , Figure 1 This is a front view structural diagram of the intermediate roller in some embodiments of this application.

[0031] like Figure 1 As shown, this application provides an intermediate roller 100, including a working part 10. The working part 10 includes a first cone 11, a second cone 12, and a flat roller 13 arranged sequentially along the axial direction (x direction in the figure). The diameters of the first cone 11 and the second cone 12 gradually decrease in the direction away from the flat roller 13. The maximum diameter of the first cone 11 is smaller than the maximum diameter of the second cone 12, and the slope of the second cone 12 is smaller than the slope of the first cone 11.

[0032] Optionally, the flat roller portion 13 can be approximated as a cylinder, and the first cone portion 11 and the second cone portion 12 can be approximated as two frustums. The slope of the first cone portion 11 and the second cone portion 12 is half the taper of the frustum. The taper formula of the frustum is the ratio of the difference between the diameter of the large end and the diameter of the small end to the height of the frustum.

[0033] Optionally, the intermediate roll 100 is used to support the work roll 200 and drive the work roll 200, which is used to directly roll the sheet 300. At least a portion of the working section 10 abuts against the work roll 200, the roll gap between the first conical section 11 and the work roll 200 is larger than the roll gap between the second conical section 12 and the work roll 200, and the roll gap between the second conical section 12 and the work roll 200 is larger than the roll gap between the flat roll section 13 and the work roll 200.

[0034] The intermediate roller 100 provided in this embodiment includes a working part 10. The working part 10 includes a first cone 11, a second cone 12, and a flat roller 13 arranged sequentially along the axial direction x. The diameters of the first cone 11 and the second cone 12 gradually decrease in the direction away from the flat roller 13. The diameter of the first cone 11 is smaller than the diameter of the second cone 12, and the slope of the second cone 12 is smaller than the slope of the first cone 11. By arranging the first cone 11 and the second cone 12 sequentially, the slope of the intermediate roller 100 gradually increases in the direction away from the flat roller 13, thereby gradually widening the gap between the intermediate roller 100 and the working roller 200. This reduces the uneven extrusion of the working roller 200 on the sheet 300, facilitates the outward flow of metal, improves the residual uneven internal stress of the sheet 300, and thus reduces the diagonal stripe defects of the sheet 300, improving product quality and yield.

[0035] In some alternative embodiments, the working part 10 further includes a transition part 14 located between the second cone part 12 and the flat roller part 13. The diameter of the transition part 14 gradually decreases in the direction away from the flat roller part 13. The maximum diameter of the second cone part 12 is smaller than the maximum diameter of the transition part 14, and the slope of the transition part 14 is smaller than the slope of the second cone part 12.

[0036] Optionally, the transition portion 14 can also be viewed as an approximate frustum, with the slope of the transition portion 14 being half the taper of the frustum. The connection points between the flat roller portion 13, the transition portion 14, the second cone portion 12, and the first cone portion 11 can be rounded to ensure a smooth transition between the portions.

[0037] Optionally, the diameter of the transition portion 14, the first cone portion 11, and the second cone portion 12 along the axial direction x can vary uniformly or non-uniformly.

[0038] The intermediate roller 100 provided in this embodiment, through the sequential arrangement of the first cone 11, the second cone 12 and the transition portion 14, makes the slope of the intermediate roller 100 gradually increase in the direction away from the flat roller portion 13, reducing the edge compression of the work roller 200 on the plate 300 and reducing the waviness defect in the plate 300; at the same time, due to the effect of the transition portion 14, the sudden increase of the roller gap is reduced, the smoothness of the metal flowing outward is improved, and the diagonal stripe defect in the plate 300 is further reduced.

[0039] Please refer to Figures 1 to 2, Figure 2 An example is shown. Figure 1 This is a magnified view of a portion of the intermediate roller. For ease of drawing, the dimensions in the drawing are not necessarily proportional to the actual dimensions.

[0040] like Figure 2 As shown, in some optional embodiments, the length of the transition portion 14 in the axial x direction is greater than or equal to 200 mm and less than or equal to 250 mm, and the maximum radius difference of the transition portion 14 is greater than or equal to 0.02 mm and less than or equal to 0.04 mm.

[0041] Optionally, the maximum radius difference of the transition section 14 is the radius difference between the upper and lower base surfaces of the frustum containing the transition section 14. Alternatively, it can be understood as the cone height H3 of the transition section 14 being greater than or equal to 0.02 mm and less than or equal to 0.04 mm, and the cone depth L3 of the transition section 14 being greater than or equal to 200 mm and less than or equal to 250 mm. The slope of the transition section 14 can be obtained by dividing the cone height by the cone depth. For example, when the cone height H3 of the transition section 14 is equal to 0.02 mm and the cone depth L3 of the transition section 14 is equal to 200 mm, the slope of the transition section 14 is 0.0001.

[0042] In some optional embodiments, the length of the first cone 11 in the axial x direction is greater than or equal to 400 mm and less than or equal to 430 mm, and the maximum radius difference of the first cone 11 is greater than or equal to 0.7 mm and less than or equal to 0.9 mm.

[0043] Optionally, the maximum radius difference of the first cone 11 is the radius difference between the upper and lower base surfaces of the frustum containing the first cone 11. Alternatively, it can be understood that the cone height H1 of the first cone 11 is greater than or equal to 0.7 mm and less than or equal to 0.9 mm, and the cone depth L1 of the first cone 11 is greater than or equal to 400 mm and less than or equal to 430 mm. The slope of the first cone 11 can be obtained by dividing the cone height by the cone depth. For example, when the cone height H1 of the first cone 11 is equal to 0.7 mm and the cone depth L1 of the first cone 11 is equal to 400 mm, the slope of the first cone 11 is 0.00175.

[0044] In some optional embodiments, the length of the second cone 12 in the axial x direction is greater than or equal to 120 mm and less than or equal to 130 mm, and the maximum radius difference of the second cone 12 is greater than or equal to 0.02 mm and less than or equal to 0.04 mm.

[0045] Optionally, the maximum radius difference of the second cone 12 is the radius difference between the upper and lower base surfaces of the frustum containing the first cone 11. Alternatively, it can be understood that the cone height H2 of the second cone 12 is greater than or equal to 0.02 mm and less than or equal to 0.04 mm, and the cone depth L1 of the first cone 11 is greater than or equal to 120 mm and less than or equal to 130 mm. The slope of the second cone 12 can be obtained by dividing the cone height by the cone depth. For example, when the cone height H2 of the second cone 12 is equal to 0.02 mm and the cone depth L2 of the second cone 12 is equal to 120 mm, the slope of the second cone 12 is equal to 0.00017.

[0046] In this embodiment, the slope of the second cone 12 of the intermediate roller 100 is slightly greater than that of the transition portion 14, and the slope of the first cone 11 is much greater than that of the transition portion 14. Through the multi-level slope changes of the transition portion 14, the second cone 12 and the first cone 11, the slope of the first cone 11 meets the requirements of the roll gap, while the transition portion 14 and the second cone 12 transition in multiple levels, reducing the sudden increase of the roll gap, improving the smoothness of the metal flowing outward, and further reducing the diagonal stripe defects of the plate 300.

[0047] In some alternative embodiments, the length of the flat roller portion 13 in the axial x direction is greater than or equal to 910 mm and less than or equal to 1000 mm.

[0048] Optionally, the working section 10 has a total length of 1720 mm in the axial x direction, and the rolling mill including the intermediate roll 100 can roll various plates with a width of less than 1720 mm. When the rolling mill needs to roll plates of other sizes, the intermediate roll 100 can be enlarged or reduced proportionally, so that the first cone 11, the second cone 12 and the transition section 14 on the intermediate roll 100 can function.

[0049] Optionally, an existing intermediate roller also includes a working section, which is also 1720 mm long. However, this working section only includes a first cone section, a transition section, and a flat roller section. The first cone section has a cone depth of 360 mm, the transition section has a cone depth of 70 mm, and the flat roller section is 1290 mm long. The tapered coverage area of ​​this intermediate roller is relatively narrow, and the double-sided diagonal stripe area of ​​the board cannot be completely eliminated.

[0050] The intermediate roller 100 provided in this embodiment reduces the length of the flat roller portion 13, widens the tapered coverage area of ​​the edge, and further reduces the area range of the diagonal stripes.

[0051] In some alternative embodiments, the intermediate roller 100 further includes a support portion 20 located on both sides of the working portion 10 in the axial x direction, and a bearing seat 21 is sleeved on the support portion 20.

[0052] In summary, the intermediate roller 100 provided in this embodiment includes a working part 10, which includes a first cone 11, a second cone 12, and a flat roller 13 arranged sequentially along the axial direction x. The diameters of the first cone 11 and the second cone 12 gradually decrease in the direction away from the flat roller 13. The diameter of the first cone 11 is smaller than that of the second cone 12, and the slope of the second cone 12 is smaller than that of the first cone 11. Through the sequential arrangement of the first cone 11 and the second cone 12, the slope of the intermediate roller 100 gradually increases in the direction away from the flat roller 13, thereby gradually widening the gap between the intermediate roller 100 and the working roller 200. This reduces the uneven extrusion of the working roller 200 on the sheet 300, facilitates the outward flow of metal, improves the residual uneven internal stress of the sheet 300, and thus reduces the diagonal stripe defects of the sheet 300, improving product quality and yield.

[0053] Please refer to Figure 3 , Figure 3 A front view schematic diagram of an example rolling mill and sheet metal is shown.

[0054] An embodiment of the second aspect of this application also provides a rolling mill, including work rolls 200 and intermediate rolls 100 of any of the embodiments of the first aspect described above. At least two work rolls 200 are symmetrically arranged with respect to a first plane z, and at least a portion of the working section 10 abuts against the work rolls 200.

[0055] Optionally, the length of the work roll 200 is less than the length of the intermediate roll 100. Figure 3 The 300 plate material is made of high-strength steel with a width of 1250mm.

[0056] Optionally, the rolling mill can be a 6-roll mill, an 18-roll mill, or a 20-roll mill. A 6-roll mill includes two sets of work rolls, two sets of intermediate rolls, and two sets of support rolls (not shown). Compared to a 6-roll mill, 18-roll and 20-roll mills also have multiple sets of lateral support roll systems arranged around the upper and lower work rolls, and the diameter of the work rolls in 18-roll and 20-roll mills is smaller than that in 6-roll mills.

[0057] Optionally, during the rolling process, both the exit and inlet sides of the sheet 300 are subjected to tensile force, which makes the sheet 300 taut. The sheet 300 is subjected to uniform force and there is no oblique force, which further reduces the oblique stripe defect of the sheet 300.

[0058] Optionally, during the rolling process, the pressure on the exit side of the sheet 300 is greater than the pressure on the inlet side, which promotes the flow of metal towards the inlet side and avoids metal accumulation that could cause diagonal stripe defects.

[0059] Since the rolling mill provided in the second aspect of this application includes the intermediate roll of any of the embodiments of the first aspect, the rolling mill provided in the second aspect of this application has the beneficial effects of the intermediate roll of any of the embodiments of the first aspect, which will not be repeated here.

[0060] In some optional embodiments, the intermediate roller 100 includes a first intermediate roller 101 and a second intermediate roller 102, which are located on different sides of a first plane z. A first conical portion 11, a second conical portion 12, and a flat roller portion 13 on the first intermediate roller 101 are arranged sequentially along a first direction x. The first conical portion 11, the second conical portion 12, and the flat roller portion 13 on the second intermediate roller 102 are arranged sequentially along a second direction y, where the first direction x is opposite to the second direction y.

[0061] Optional, such as Figure 3 As shown, the first conical portion 11, the second conical portion 12, and the flat roller portion 13 on the first intermediate roller 101 are arranged sequentially from left to right, while the first conical portion 11, the second conical portion 12, and the flat roller portion 13 on the second intermediate roller 102 are arranged sequentially from right to left. Optionally, the sheet material 300 is located between the two work rollers 200, and the two work rollers 200 directly contact and roll the sheet material 300 on both surfaces. The diameter of the work rollers 200 is smaller than the diameter of the intermediate roller 100. The first direction x and the second direction y are both parallel to the first plane z.

[0062] The rolling mill provided in this embodiment sets the two intermediate rolls 100 in opposite directions, so that the roll gaps on the left and right sides are symmetrical and the impact on the sheet is consistent. This avoids the problem of one side having an excessively large roll gap and the other side having no roll gap, which would cause a serious defect of diagonal stripes on one side of the sheet.

[0063] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. An intermediate roll characterized by, The working part comprises a first taper part, a second taper part and a flat roller part arranged in sequence along an axial direction, the first taper part and the second taper part gradually decrease in diameter in a direction away from the flat roller part, the maximum diameter of the first taper part is smaller than that of the second taper part, and the slope of the second taper part is smaller than that of the first taper part; The working part further comprises a transition part between the second taper part and the flat roller part, the transition part gradually decreases in diameter in a direction away from the flat roller part, the maximum diameter of the second taper part is smaller than that of the transition part, and the slope of the transition part is smaller than that of the second taper part; The connecting position between the flat roller part, the transition part, the second taper part and the first taper part is provided with a rounded corner, and the diameters of the transition part, the first taper part and the second taper part change uniformly along the axial direction; The length of the transition part in the axial direction is greater than or equal to 200 mm and less than or equal to 250 mm, the maximum radius difference of the transition part is greater than or equal to 0.02 mm and less than or equal to 0.04 mm, and the maximum radius difference of the transition part is the radius difference between the upper base and the lower base of the circular truncated cone in which the transition part is located; The length of the first taper part in the axial direction is greater than or equal to 400 mm and less than or equal to 430 mm, the maximum radius difference of the first taper part is greater than or equal to 0.7 mm and less than or equal to 0.9 mm, and the maximum radius difference of the first taper part is the radius difference between the upper base and the lower base of the circular truncated cone in which the first taper part is located; The length of the second taper part in the axial direction is greater than or equal to 120 mm and less than or equal to 130 mm, the maximum radius difference of the second taper part is greater than or equal to 0.02 mm and less than or equal to 0.04 mm, and the maximum radius difference of the second taper part is the radius difference between the upper base and the lower base of the circular truncated cone in which the second taper part is located; The length of the flat roller part in the axial direction is greater than or equal to 910 mm and less than or equal to 1000 mm.

2. The intermediate roll of claim 1, wherein Further comprising a bearing part located on both sides of the working part in the axial direction, and a bearing seat is sleeved on the bearing part.

3. A rolling mill characterized by, The intermediate roller comprises a first intermediate roller and a second intermediate roller, the first intermediate roller and the second intermediate roller are located on different sides of the first plane, the first taper part, the second taper part and the flat roller part on the first intermediate roller are arranged in sequence along a first direction, the first taper part, the second taper part and the flat roller part on the second intermediate roller are arranged in sequence along a second direction, and the first direction is opposite to the second direction.

4. The rolling mill of claim 3, wherein, ​

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