A method for improving chatter in a single stand reciprocating rolling mill

Abstract

The application discloses a method for improving the generation of chatter marks of a single-stand reciprocating rolling mill, and the single-stand reciprocating rolling mill comprises a lower supporting roller driven by a main oil cylinder, a first intermediate roller, a first working roller, a second working roller, a second intermediate roller and an upper supporting roller are sequentially arranged upwards from the lower supporting roller, the first working roller and the second working roller are drivingly connected with a main shaft coupling; wherein, when the lower supporting roller and the upper supporting roller are calibrated without a strip, the calibration force is set to 9-11 MN, the output fluctuation of the rolling force of the main oil cylinder is reduced, and the control precision is improved; and when the single-stand reciprocating rolling mill is operated, the lower supporting roller is lifted by the main oil cylinder rising, so that the adjacent roller surfaces between the lower supporting roller, the first intermediate roller, the first working roller, the second working roller, the second intermediate roller and the upper supporting roller are pressed against each other, and a rolling force of 2-15 MN is generated; the application can effectively improve the problem of the generation of chatter marks in time, so that the surface quality of the strip is improved.

Description

Technical Field

[0001] This invention relates to the field of steel plate processing, and specifically to a method for improving the chatter marks generated in a single-stand reciprocating rolling mill. Background Technology

[0002] In the current single-stand reciprocating rolling mill production process, strip steel surfaces often exhibit alternating light and dark stripes perpendicular to the rolling direction, also known as tremor marks. The occurrence of tremor marks has an adverse impact on steel rolling production, making it difficult for products to meet customer quality requirements for strip steel surfaces, and leading to an increase in the number of roll changes, which significantly affects the production efficiency of strip steel products.

[0003] Therefore, the applicant urgently needs to find an advanced technical solution to determine the cause of mill chatter marks. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a method for improving the generation of chatter marks in a single-stand reciprocating rolling mill, which can improve the problem of chatter marks in a timely and effective manner, thereby improving the surface quality of the strip steel.

[0005] The technical solution adopted in this invention is as follows: A method for improving chatter marks in a single-stand reciprocating rolling mill, the single-stand reciprocating rolling mill comprising a lower support roll (11a) driven by a main hydraulic cylinder (16), and, sequentially arranged upwards from the lower support roll (11a) are a first intermediate roll (12a), a first work roll (13a), a second work roll (13b), a second intermediate roll (12b), and an upper support roll (11b), the first work roll (13a) and the second work roll (13b) being drivenly connected to a main coupling (14); wherein, in the operation of the lower support roll (11a) and the upper support roll (12a)... 11b) When performing stripless calibration, the calibration force is set to 9-11MN to reduce the output fluctuation of the rolling force of the main oil cylinder (16) and improve the control accuracy; and when the single-stand reciprocating mill is running, the lower support roll (11a) is lifted by the main oil cylinder (16), so that the adjacent roll surfaces between the lower support roll (11a), the first intermediate roll (12a), the first work roll (13a), the second work roll (13b), the second intermediate roll (12b) and the upper support roll (11b) are pressed together to generate a rolling force of 2MN-15MN.

[0006] Preferably, when the single-stand reciprocating rolling mill is running, the main coupling (14) rotates synchronously to drive the first work roll (13a) and the second work roll (13b) to rotate, wherein the first work roll (13a) drives the first intermediate roll (12a) to rotate, and the first intermediate roll (12a) drives the lower support roll (11a) to rotate; the second work roll (13b) drives the second intermediate roll (12b) to rotate, and the second intermediate roll (12b) drives the upper support roll (11b) to rotate.

[0007] Preferably, copper sliding plates (15) are installed on both sides of the bearing seats of the lower support roller (11a), the first intermediate roller (12a), the first working roller (13a), the second working roller (13b), the second intermediate roller (12b), and the upper support roller (11b); wherein, the copper sliding plates (15) of the first intermediate roller (12a) and the copper sliding plates (15) of the second intermediate roller (12b) are pressed together with their corresponding mounting plates on the outlet side, and the copper sliding plates (15) of the lower support roller (11a), the first working roller (13a), the second working roller (13b), and the upper support roller (11b) are pressed together with their corresponding mounting plates on the outlet side.

[0008] Preferably, the total diameter of the lower support roller (11a), the first intermediate roller (12a), the first working roller (13a), the second working roller (13b), the second intermediate roller (12b), and the upper support roller (11b) is not less than 3600mm.

[0009] Preferably, the calibration force is set to 9.8-10.2MN, and the total roller diameter is not less than 3800mm.

[0010] Preferably, the diameter of the lower support roller (11a) is equal to the diameter of the upper support roller (11b); the diameter of the first intermediate roller (12a) is equal to the diameter of the second intermediate roller (12b); the diameter of the first working roller (13a) is equal to the diameter of the second working roller (13b); wherein the diameter of the first intermediate roller (12a) is greater than the diameter of the first working roller (13a) and less than the diameter of the lower support roller (11a).

[0011] Preferably, the diameter of the lower support roller (11a) is in the range of 1020-1050mm, the diameter of the first intermediate roller (12a) is in the range of 440-490mm, and the diameter of the first working roller (13a) is in the range of 380-425mm.

[0012] Preferably, the centerline of the first intermediate roller (12a) and the centerline of the second intermediate roller (12b) are respectively provided with an eccentric distance of 2.5-3.5mm.

[0013] Preferably, the main coupling (14) is regularly maintained and dynamically balanced.

[0014] Preferably, the severely worn copper slide plate (15) is inspected and replaced regularly, and an inspection and replacement log is established; the thickness of the installed liner is checked regularly, and it is replaced in time when the thickness exceeds the allowable deviation.

[0015] This application proposes a roll group structure design consisting of a lower support roll, a first intermediate roll, a first work roll, a second work roll, a second intermediate roll, and an upper support roll. When calibrating the lower and upper support rolls without strip steel, the calibration force is set to 9-11MN to reduce the output fluctuation of the main hydraulic cylinder's rolling force, which can significantly improve the thickness control accuracy. During equipment operation, the main hydraulic cylinder rises and lifts the lower support roll, causing the adjacent roll surfaces of the lower support roll, the first intermediate roll, the first work roll, the second work roll, the second intermediate roll, and the upper support roll to press against each other, generating a rolling force of 2MN-15MN. This structural design can effectively and promptly improve the problem of chatter marks, thereby improving the surface quality of the strip steel. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a single-stand reciprocating rolling mill structure according to a specific embodiment of the present invention. Detailed Implementation

[0017] This invention discloses a method for improving chatter marks in a single-stand reciprocating rolling mill. The single-stand reciprocating rolling mill includes a lower support roll driven by a main hydraulic cylinder. From the lower support roll upwards, a first intermediate roll, a first work roll, a second work roll, a second intermediate roll, and an upper support roll are arranged sequentially. The first work roll and the second work roll are driven and connected to the main coupling. When calibrating the lower support roll and the upper support roll without strip steel, the calibration force is set to 9-11MN to reduce the output fluctuation of the rolling force of the main hydraulic cylinder and improve the control accuracy. When the single-stand reciprocating rolling mill is running, the lower support roll is raised by the main hydraulic cylinder, so that the adjacent roll surfaces of the lower support roll, the first intermediate roll, the first work roll, the second work roll, the second intermediate roll, and the upper support roll are pressed together to generate a rolling force of 2MN-15MN.

[0018] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0019] For a method to improve chatter marks in a single-stand reciprocating rolling mill, please refer to [link / reference]. Figure 1 The single-stand reciprocating rolling mill shown includes a lower support roll 11a driven by a main hydraulic cylinder 16 (including main hydraulic cylinders 16 located on the left and right sides of the bottom of the lower support roll 11a respectively). A first intermediate roll 12a, a first work roll 13a, a second work roll 13b, a second intermediate roll 12b, and an upper support roll 11b are sequentially arranged upwards from the lower support roll 11a. The first work roll 13a and the second work roll 13b are drivenly connected to the main coupling 14. During stripless steel calibration of the lower support roll 11a and the upper support roll 11b, the calibration force... Set to 9-11MN, this calibration force has been verified to make the calculated values ​​of each roll gap and rolling force closer to the actual values, reduce the output fluctuation of the rolling force of the main hydraulic cylinder 16, and improve the control accuracy. Moreover, when the single-stand reciprocating mill is running, the lower support roll 11a is lifted by the main hydraulic cylinder 16, so that the adjacent roll surfaces between the lower support roll 11a, the first intermediate roll 12a, the first work roll 13a, the second work roll 13b, the second intermediate roll 12b, and the upper support roll 11b are pressed together to generate a rolling force of 2MN-15MN.

[0020] Preferably, in this embodiment, during the operation of a single-stand reciprocating rolling mill, the main coupling 14 rotates synchronously, driving the first work roll 13a and the second work roll 13b to rotate. The first work roll 13a drives the first intermediate roll 12a to rotate, and the first intermediate roll 12a drives the lower support roll 11a to rotate. The second work roll 13b drives the second intermediate roll 12b to rotate, and the second intermediate roll 12b drives the upper support roll 11b to rotate. Preferably, in this embodiment, the lower support roll 11a, the first intermediate roll 12a, and the first work roll 13a... The bearing seats on both sides of the second working roller 13b, the second intermediate roller 12b, and the upper support roller 11b are all equipped with copper sliding plates 15; wherein, the copper sliding plates 15 of the first intermediate roller 12a and the second intermediate roller 12b and their corresponding mounting plates (not shown in the figure) are pressed together on the exit side, and the copper sliding plates 15 of the lower support roller 11a, the first working roller 13a, the second working roller 13b, and the upper support roller 11b and their corresponding mounting plates (not shown in the figure) are pressed together on the exit side.

[0021] Preferably, in this embodiment, the total diameter of the lower support roller 11a, the first intermediate roller 12a, the first working roller 13a, the second working roller 13b, the second intermediate roller 12b, and the upper support roller 11b is not less than 3600mm; more preferably, in this embodiment, the calibration force is set to 9.8-10.2MN (10MN is specifically used in this embodiment), and the total diameter of the rollers is not less than 3800mm.

[0022] Preferably, in this embodiment, the diameter of the lower support roll 11a is equal to the diameter of the upper support roll 11b; the diameter of the first intermediate roll 12a is equal to the diameter of the second intermediate roll 12b; and the diameter of the first work roll 13a is equal to the diameter of the second work roll 13b. The diameter of the first intermediate roll 12a is larger than the diameter of the first work roll 13a and smaller than the diameter of the lower support roll 11a. This is equivalent to using a structure with a large-diameter support roll, a large-diameter intermediate roll, and a small-diameter work roll, thus achieving the required roll specifications for the rolling mill and effectively improving the chatter marks that may occur during the operation of a single-stand reciprocating rolling mill. More preferably, in this embodiment, the diameter of the lower support roller 11a is in the range of 1020-1050mm, the diameter of the first intermediate roller 12a is in the range of 440-490mm, and the diameter of the first working roller 13a is in the range of 380-425mm.

[0023] Preferably, in order to ensure the expected rolling force is generated and to avoid chatter marks as much as possible, in this embodiment, the center line of the first intermediate roll 12a and the center line of the second intermediate roll 12b are respectively provided with an eccentric distance of 2.5-3.5mm. More preferably, in this embodiment, the center line of the first intermediate roll 12a and the center line of the second intermediate roll 12b are respectively provided with an eccentric distance of 3mm.

[0024] Preferably, in this embodiment, the main coupling 14 is regularly maintained and dynamically balanced; each copper slide plate 15 is regularly inspected and replaced, and a replacement log for the copper slide plate 15 is established; the thickness of the mounting liner is regularly inspected, and it is replaced in time when the thickness exceeds the allowable deviation, thereby further realizing the standardized management of key structures in the single-stand reciprocating rolling mill, which further effectively improves the chatter defects of the rolling mill products.

[0025] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0026] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for improving chatter marks generated in a single-stand reciprocating rolling mill, characterized in that, The single-stand reciprocating rolling mill includes a lower support roll (11a) driven by a main hydraulic cylinder (16). From the lower support roll (11a) upwards, a first intermediate roll (12a), a first work roll (13a), a second work roll (13b), a second intermediate roll (12b), and an upper support roll (11b) are sequentially arranged. The first work roll (13a) and the second work roll (13b) are drivenly connected to the main coupling (14). The lower support roll (11a) and the upper support roll (11b) are used for stripless steel marking. When the timing is set, the calibration force is set to 9-11MN to reduce the output fluctuation of the rolling force of the main oil cylinder (16) and improve the control accuracy; and when the single-stand reciprocating rolling mill is running, the lower support roll (11a) is lifted by the main oil cylinder (16), so that the adjacent roll surfaces between the lower support roll (11a), the first intermediate roll (12a), the first work roll (13a), the second work roll (13b), the second intermediate roll (12b) and the upper support roll (11b) are pressed together to generate a rolling force of 2MN-15MN; When the single-stand reciprocating rolling mill is running, the main coupling (14) rotates synchronously, driving the first work roll (13a) and the second work roll (13b) to rotate. The first work roll (13a) drives the first intermediate roll (12a) to rotate, and the first intermediate roll (12a) drives the lower support roll (11a) to rotate. The second work roll (13b) drives the second intermediate roll (12b) to rotate, and the second intermediate roll (12b) drives the upper support roll (11b) to rotate. The lower support roller (11a), the first intermediate roller (12a), the first working roller (13a), the second working roller (13b), the second intermediate roller (12b), and the upper support roller (11b) are all equipped with copper sliding plates (15) on both sides of the bearing seats. Among them, the copper sliding plates (15) of the first intermediate roller (12a) and the copper sliding plates (15) of the second intermediate roller (12b) are pressed together with their corresponding mounting plates on the outlet side. The copper sliding plates (15) of the lower support roller (11a), the first working roller (13a), the second working roller (13b), and the upper support roller (11b) are pressed together with their corresponding mounting plates on the outlet side. The total diameter of the lower support roller (11a), the first intermediate roller (12a), the first working roller (13a), the second working roller (13b), the second intermediate roller (12b), and the upper support roller (11b) is not less than 3600mm; The diameter of the lower support roller (11a) is equal to the diameter of the upper support roller (11b); the diameter of the first intermediate roller (12a) is equal to the diameter of the second intermediate roller (12b); the diameter of the first working roller (13a) is equal to the diameter of the second working roller (13b); wherein the diameter of the first intermediate roller (12a) is greater than the diameter of the first working roller (13a) and less than the diameter of the lower support roller (11a); The diameter of the lower support roller (11a) is 1020-1050mm, the diameter of the first intermediate roller (12a) is 440-490mm, and the diameter of the first working roller (13a) is 380-425mm. The centerline of the first intermediate roller (12a) and the centerline of the second intermediate roller (12b) are respectively provided with an eccentric distance of 2.5-3.5mm.

2. The method for improving chatter marks in a single-stand reciprocating rolling mill according to claim 1, characterized in that, The calibration force is set to 9.8-10.2MN, and the total roller diameter is not less than 3800mm.

3. The method for improving chatter marks in a single-stand reciprocating rolling mill according to claim 1, characterized in that, The main coupling (14) shall be regularly maintained and dynamically balanced.

4. The method for improving chatter marks in a single-stand reciprocating rolling mill according to claim 1, characterized in that, Regularly inspect and replace severely worn copper slide plates (15), and establish an inspection and replacement log; regularly check the thickness of the installed liner plates, and replace them in time when the thickness exceeds the allowable deviation.

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