An EDT rolling texturing roll for aluminum alloy sheet and its driving method

Abstract

An EDT rolling texturing roll for aluminum alloy sheets and its driving method. A flat head sleeve is rotatably arranged on the outer cylindrical surface of the shaft head on the driving side of the texturing roll, and the texturing roll is connected to the output shaft of the reducer through the flat head sleeve. When the texturing roll is working, the flat head sleeve rotates with the output shaft of the reducer connected to it, and the texturing roll rotates synchronously with the rolling speed of the aluminum alloy strip, thus isolating the driving connection between the texturing roll and the output shaft of the reducer. Even if there is a large diameter difference between the smooth roll and the texturing roll, it still will not cause the reducer to generate a closed torque. Therefore, when the smooth roll or the texturing roll needs to be repaired and reground, only the smooth roll or the texturing roll with severe wear needs to be repaired and reground separately, thereby reducing the workload of repairing and regrounding the working roll and extending the service life of the working roll. When the texturing roll of the present invention is in use, there is no need to change the existing structure of the reducer, and it is also applicable to the rolling production line of the existing reducer without a shifting structure that has been put into use. Therefore, it is easier to promote and apply.

Description

Technical Field

[0001] The present invention relates to the technical field of EDT rolling equipment for aluminum alloy sheets, and particularly relates to an EDT rolling texturing roll for aluminum alloy sheets and a driving method thereof. Background Art

[0002] Most metal strip rolling adopts the double-roll drive mode of work rolls. Two output shafts of a speed reducer synchronously drive a pair of rolling work rolls to rotate for rolling the metal strip; in recent years, with the development trend of lightweight automotive sheets, more and more aluminum alloy strip materials have been promoted and applied as blanks for automotive sheets; during the rolling production process of automotive aluminum alloy strip materials, the last pass must undergo small-pressure EDT rolling (texturing rolling); when performing EDT rolling on aluminum alloy strip materials, one of the pair of rolling work rolls used is a smooth roll, and the other is a textured roll (i.e., a texturing roll) with a surface treated by electric spark discharge; since the surface wear rates of the smooth roll and the texturing roll are different during the rolling process, their maintenance and regrinding frequencies and regrinding amounts are also different; at the initial stage of use of the pair of rolling work rolls used for EDT rolling, their diameters are the same, so there will be no problem of closed torque in the speed reducer when using double-roll drive; however, as the use time of the rolling work rolls increases and the number of maintenance and regrinding times increases, a large diameter difference will occur between the smooth roll and the texturing roll. The diameter difference will cause the linear velocities of their outer surfaces to be different at the same rotational speed, resulting in a closed torque problem in the speed reducer. As the diameter difference between the smooth roll and the texturing roll increases, the closed torque also becomes larger and larger, which increases the load between the gears of the speed reducer, shortens the service life, and even causes the speed reducer to be damaged when the closed torque is too large.

[0003] At present, there are two solutions to solve the problem of closed torque during EDT rolling. The first solution is as follows: when one of the smooth roll and the textured roll needs to be reground, regardless of the wear condition of the other roll, both rolls must be reground together to achieve the same working diameter, so as to solve the problem of closed torque of the speed reducer; however, this method increases the workload of work roll maintenance and regrinding, and at the same time shortens the service life of the work roll, thus affecting the economic benefits of the enterprise. Another solution to solve the problem of closed torque during EDT rolling is to modify the structural design of the speed reducer and add a shifting device to the original speed reducer. During normal rolling, the two output shafts of the speed reducer rotate synchronously. During EDT rolling, the speed reducer is switched to a single-shaft output mode through the shifting device, and the output shaft connected to the textured roll is disengaged from the drive connection, that is, no drive torque is input to the textured roll; however, due to the large structure, high torque and high speed of the rolling mill speed reducer, the cost of adding a shifting structure is relatively high, and at the same time it also affects the reliability of the speed reducer operation. Therefore, this solution is not the best solution; in addition, this solution is only applicable to newly built rolling production lines and is not applicable to existing rolling production lines with speed reducers without shifting structures that have been built and put into use. Therefore, this solution is not easy to promote and apply. Summary of the Invention

[0004] In order to overcome the deficiencies in the background technology, the present invention discloses a textured roll for EDT rolling of aluminum alloy sheets. A flat head sleeve is rotatably arranged on the outer cylindrical surface of the shaft head on the drive side of the textured roll. The outer dimension of the textured roll with the flat head sleeve is exactly the same as that of the original textured roll. Therefore, there is no need to modify the speed reducer and any structural dimensions connected to the textured roll; when this structured textured roll is in use, the flat head sleeve rotates with the output shaft of the speed reducer connected to it, and the textured roll rotates synchronously with the rolling speed of the aluminum alloy strip, thus isolating the drive connection between the textured roll and the output shaft of the speed reducer. Even if there is a large diameter difference between the smooth roll and the textured roll, the speed reducer will still not generate closed torque. Therefore, when the smooth roll or the textured roll needs to be repaired and reground, only the severely worn smooth roll or textured roll needs to be repaired and reground separately, thereby reducing the workload of work roll maintenance and regrinding, extending the service life of the work roll, and improving the economic benefits of the enterprise; in addition, this textured roll for EDT rolling of aluminum alloy sheets is also applicable to existing rolling production lines with speed reducers without shifting structures that have been built and put into use. Therefore, it is easy to promote and apply.

[0005] In order to achieve the above-mentioned invention object, the present invention adopts the following technical solution: An EDT rolling texturing roll for aluminum alloy plates, on the outer cylindrical surface of the shaft head on the driving side of the texturing roll, a flat head sleeve is rotatably arranged, and a blind cover is fixedly arranged on the outer end face of the flat head sleeve; after the flat head sleeve and the blind cover are arranged, the outer shape dimensions of the texturing roll are exactly the same as those of the original texturing roll. Therefore, without changing the reducer and any structural dimensions connected to the texturing roll, the normal connection between the texturing roll and the reducer can be achieved; when this structural texturing roll is in use, the flat head sleeve rotates with the output shaft of the reducer connected to it, and the texturing roll rotates synchronously with the rolling speed of the aluminum alloy strip, thereby isolating the driving connection between the texturing roll and the output shaft of the reducer. Even if there is a large diameter difference between the smooth roll and the texturing roll, the reducer will not generate a closed torque; when this structural texturing roll is working normally, the rotational speed difference between the flat head sleeve and the texturing roll is extremely small. Therefore, the wear between the flat head sleeve and the texturing roll is relatively small, and a clearance connection structure can be directly adopted between the flat head sleeve and the texturing roll.

[0006] Further, the flat head sleeve is rotatably connected to the shaft head on the driving side of the texturing roll through a bearing or a bearing bush; adopting the bearing or bearing bush connection structure can further reduce the wear between the flat head sleeve and the texturing roll and improve the service life of the texturing roll.

[0007] Further, a clutch is arranged between the blind cover and the end face of the shaft head on the driving side of the texturing roll; after a flat head sleeve is rotatably arranged on the outer cylindrical surface of the shaft head on the driving side of the texturing roll, although the driving isolation between the texturing roll and the output shaft of the reducer is achieved, another problem it brings is that: in the acceleration stage at the initial stage of EDT rolling, since the acceleration of the texturing roll is completely provided by the direct drive of the aluminum alloy plate, when the acceleration at the initial stage of EDT rolling is relatively fast and the maximum acceleration that the aluminum alloy plate can provide is less than the minimum acceleration actually required by the texturing roll, a "slipping" phenomenon will occur between the aluminum alloy plate and the texturing roll, resulting in a "flower pulling" problem on the textured surface of the aluminum alloy plate; to avoid this problem, it is necessary to limit the maximum acceleration in the acceleration stage at the initial stage of EDT rolling, so the acceleration time at the initial stage of EDT rolling is prolonged, reducing the production efficiency of EDT rolling; after a clutch is arranged between the blind cover and the end face of the shaft head on the driving side of the texturing roll, in the acceleration stage of the texturing roll at the initial stage of rolling, it is jointly driven and accelerated by the aluminum alloy plate to be rolled and the clutch, thereby increasing the maximum acceleration allowed at the initial stage of EDT rolling and solving the problems of prolonged acceleration time at the initial stage of EDT rolling and reduced production efficiency of EDT rolling.

[0008] Furthermore, an electromagnetic clutch or a magnetorheological fluid clutch is adopted for the clutch. Both the electromagnetic clutch and the magnetorheological fluid clutch can provide an accelerating torque for the texturing roll at the initial stage of EDT rolling. However, correspondingly, when there is a diameter difference between the texturing roll and the smooth roll, a closed torque will also be generated in the speed reducer. To prevent the closed torque from being too large and causing the shortening of the service life of the speed reducer or even overload damage, it is necessary to control the maximum transmission torque that the electromagnetic clutch or the magnetorheological fluid clutch can provide. Among them, the maximum transmission torque that the electromagnetic clutch can provide is determined by its structural design and is a fixed value. Among them, the maximum transmission torque that the magnetorheological fluid clutch can provide is determined by its working current. Therefore, it has the characteristics of being autonomously controllable. It can flexibly set its maximum working torque according to specific needs, while solving the problems of extended acceleration time and reduced production efficiency at the initial stage of EDT rolling, and ensuring the service life and overload damage problem of the speed reducer.

[0009] A driving method for the texturing roll in EDT rolling of aluminum alloy sheets. During the EDT rolling process of aluminum alloy sheets, in the acceleration stage at the initial stage of rolling and the normal rolling stage of aluminum alloy sheets, the texturing roll is driven to rotate by the aluminum alloy sheets to be rolled. This driving method for the texturing roll in EDT rolling of aluminum alloy sheets actually corresponds to the situation where no clutch is provided between the blind cover and the texturing roll.

[0010] Furthermore, during the EDT rolling process of aluminum alloy sheets, in the acceleration stage at the initial stage of rolling, the texturing roll is jointly driven and accelerated to rotate by the aluminum alloy sheets to be rolled and the clutch. In the normal rolling stage of aluminum alloy sheets, the clutch stops working, and the texturing roll is driven to rotate by the aluminum alloy sheets to be rolled to maintain synchronization with the rolling speed of the aluminum alloy sheets. This driving method for the texturing roll in EDT rolling of aluminum alloy sheets actually corresponds to the situation where a clutch is provided between the blind cover and the texturing roll.

[0011] Due to the above - mentioned technical solution, the present invention has the following beneficial effects: An EDT rolling texturing roll for aluminum alloy sheets and its driving method disclosed by the present invention rotate a flat - head sleeve on the outer cylindrical surface of the shaft head on the driving side of the texturing roll. After setting the flat - head sleeve, the external dimensions of the texturing roll are exactly the same as those of the original texturing roll. Therefore, there is no need to modify the reducer and any structural dimensions connected to the texturing roll. When this structural texturing roll is in use, the flat - head sleeve rotates with the output shaft of the reducer connected to it, and the texturing roll rotates synchronously with the rolling speed of the aluminum alloy strip. Thus, the driving connection between the texturing roll and the output shaft of the reducer is isolated. Even if there is a large diameter difference between the smooth roll and the texturing roll, the reducer will not generate a closing torque. Therefore, when the smooth roll or the texturing roll needs to be repaired and reground, only the severely worn smooth roll or texturing roll needs to be repaired and reground separately. This reduces the workload of repairing and regrinding the working rolls, extends the service life of the working rolls, and improves the economic benefits of the enterprise. In addition, when this EDT rolling texturing roll for aluminum alloy sheets is in use, there is no need to modify the existing reducer structure, and it is also applicable to the existing rolling production lines with reducers without a shifting structure that have been built and put into use. Therefore, it is easier to promote and apply. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the EDT rolling texturing roll for aluminum alloy sheets in Embodiment 1;

[0013] Figure 2 Schematic diagram of the EDT rolling texturing roll for aluminum alloy sheets in Embodiment 2;

[0014] Figure 3 Schematic diagram of the EDT rolling texturing roll for aluminum alloy sheets in Embodiment 3;

[0015] Figure 4 Schematic diagram of the EDT rolling texturing roll for aluminum alloy sheets in Embodiment 4;

[0016] Figure 5 Schematic diagram of the EDT rolling texturing roll for aluminum alloy sheets in Embodiment 5;

[0017] Figure 6 Schematic diagram of the A - A cross - sectional structure of the EDT rolling texturing roll for aluminum alloy sheets in Embodiment 5; <A

[0018] Figure 7 Schematic diagram of the principle of the driving method of the EDT rolling texturing roll for aluminum alloy sheets in Embodiment 3;

[0019] Figure 8 Schematic diagram of the principle of the driving method of the EDT rolling texturing roll for aluminum alloy sheets in Embodiment 4.

[0020] In the figure: 1. Reducer; 2. Output shaft of the reducer; 3. Texturing roll; 4. Flat head sleeve; 5. Bearing; 6. Bearing locking nut; 7. Through cover; 8. Blind cover; 9. Clutch; 10. Journal bearing; 11. Pin; 12. Bearing housing; 13. Electric slip ring. Detailed implementation mode

[0021] The present invention can be explained in detail through the following embodiments, and the purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. Embodiment 1:

[0022] See the attached drawings of the specification Figure 1 : An EDT rolling texturing roll for aluminum alloy sheets. A flat head sleeve 4 is rotatably arranged on the outer cylindrical surface of the driving side shaft head of the texturing roll 3. There is a clearance fit between the outer cylindrical surface of the driving side shaft head of the texturing roll 3 and the inner hole of the flat head sleeve 4. The outer end face of the flat head sleeve 4 is fixedly provided with a blind cover 8 through bolts. After the flat head sleeve 4 and the blind cover 8 are provided, the outer shape and structure dimensions of the texturing roll are exactly the same as those of the original texturing roll. Therefore, without changing the reducer and any structural dimensions connected to the texturing roll, the normal connection between the texturing roll 3 and the reducer can be realized; in this embodiment, in order to prevent the flat head sleeve 4 from falling off the outer cylindrical surface of the driving side shaft head of the texturing roll 3, an anti-drop groove is provided on the outer cylindrical surface of the driving side shaft head of the texturing roll 3. The flat head sleeve 4 is evenly provided with anti-drop threaded holes corresponding to the anti-drop groove, and anti-drop bolts are arranged in the anti-drop threaded holes. The end of the anti-drop bolt extends into the anti-drop groove of the texturing roll 3. Embodiment 2:

[0023] See the attached drawings of the specification Figure 2 : In this embodiment, a clutch 9 is arranged between the blind cover 8 and the end face of the driving side shaft head of the texturing roll 3. The clutch 9 adopts an electromagnetic clutch, and the clutch 9 is fixedly arranged in the inner hole of the blind cover 8; a connection hole is provided at the right end of the texturing roll 3, a connection shaft is provided at the left end of the clutch 9, and the connection shaft is arranged in the connection hole at the right end of the texturing roll 3, and torque is transmitted through a flat key; in this embodiment, an electric slip ring 13 is also fixedly arranged on the driving side shaft head of the texturing roll 3. The electric slip ring 13 is electrically connected to the clutch 9 through a wire, and the wire is arranged in the inner hole of the driving side shaft head of the texturing roll 3. Embodiment 3:

[0024] See the attached drawings of the specification Figure 3 : In this embodiment, a pair of tapered bearings 5 are arranged between the flat head sleeve 4 and the outer circumference of the driving side shaft head of the texturing roll 3; the bearings 5 are axially positioned on the flat head sleeve 4 through the stepped holes arranged at both ends of the flat head sleeve 4, and the bearings 5 are axially fixed on the texturing roll 3 through the bearing locking nuts 6 arranged on the driving side shaft head of the texturing roll 3, and at the same time, the clearance of the bearings 5 is eliminated; a through cover 7 is fixedly arranged at the left end of the flat head sleeve 4, and a sealing ring is arranged between the through cover 7 and the texturing roll 3. Embodiment 4:

[0025] See the appended description Figure 4 : In this embodiment compared with Embodiment 3, a clutch 9 is provided between the end face of the driving side shaft head of the dull cover 8 and the dulling roll 3. The clutch 9 is a magnetorheological fluid clutch; in this embodiment, a slip ring 13 is also fixedly provided on the driving side shaft head of the dulling roll 3. Embodiment 5:

[0026] See the appended description Figure 5 、 6 : In this embodiment, a bearing bush 10 is provided between the flat head sleeve 4 and the outer circumference of the driving side shaft head of the dulling roll 3. The bearing bush 10 is a semi-circular ring structure divided into upper and lower parts. A pin 11 is provided between the bearing bush 10 and the flat head sleeve 4 to prevent the bearing bush 10 from axially moving; there is a small interference fit between the outer cylindrical surface of the bearing bush 10 and the inner hole of the flat head sleeve 4, and a clearance fit between the inner hole of the bearing bush 10 and the outer cylindrical surface of the driving side shaft head of the dulling roll 3.

[0027] Taking the EDT rolling dulling roll of aluminum alloy sheet in Embodiment 3 as an example, the driving method of the EDT rolling dulling roll of aluminum alloy sheet is described as follows: See the appended description Figure 7 , the smooth roll and the dulling roll 3 are rotatably arranged on the rolling mill body through the bearing seats 12 and bearings. The two output shafts 2 of the speed reducer 1 are respectively connected to the smooth roll and the dulling roll 3 through universal couplings. Since a flat head sleeve 4 is rotatably arranged at the end of the driving side shaft head of the dulling roll 3, the driving torque of the output shaft of the speed reducer 1 and the dulling roll 3 is completely isolated, that is, the driving torque of the output shaft of the speed reducer 1 has no driving effect on the dulling roll 3; during the EDT rolling process of the aluminum alloy sheet, during the acceleration stage at the initial stage of rolling and the normal rolling stage of the aluminum alloy sheet, the dulling roll 3 is driven to rotate by the aluminum alloy sheet to be rolled; during the acceleration stage at the initial stage of rolling, the torque for driving the dulling roll 3 by the aluminum alloy sheet to be rolled is mainly used to overcome the rotational inertia of the dulling roll 3 to make the dulling roll 3 rotate at an accelerated speed; during the normal rolling stage of the aluminum alloy sheet, the torque for driving the dulling roll 3 by the aluminum alloy sheet to be rolled is mainly used to overcome the rotational friction of the bearing 5. At this time, the driving torque of the aluminum alloy sheet to be rolled on the dulling roll 3 is extremely small, only making the dulling roll 3 rotate synchronously with the rolling speed of the aluminum alloy strip.

[0028] Taking the EDT rolling dulling roll of aluminum alloy sheet in Embodiment 4 as an example, the driving method of the EDT rolling dulling roll of aluminum alloy sheet is described as follows: See the appended description Figure 8, the smooth roll and the textured roll 3 are rotationally arranged on the rolling mill body through the bearing seats 12 and bearings. The two output shafts of the speed reducer 1 are respectively connected to the smooth roll and the textured roll 3 through universal couplings. Since a magnetorheological fluid clutch is provided between the blank cover 8 on the driving side of the textured roll 3 and the end face of the shaft head on the driving side of the textured roll 3, the driving torque of the textured roll 3 and the output shaft of the speed reducer 1 can be independently controlled. That is, by adjusting the output torque of the magnetorheological fluid clutch, the driving torque output from the output shaft of the speed reducer 1 to the textured roll 3 can be controlled. During the EDT rolling process of the aluminum alloy sheet, in the acceleration stage at the initial stage of rolling, the magnetorheological fluid clutch is set with an optimal output torque. The textured roll 3 is jointly driven and accelerated by the aluminum alloy sheet to be rolled and the clutch 9, so that the EDT rolling at the initial stage has the advantages of short acceleration time and high production efficiency. At the same time, the service life of the speed reducer can be guaranteed, and the problem that the speed reducer is not damaged by overload due to excessive closed torque can be avoided. During the normal rolling stage of the aluminum alloy sheet, the magnetorheological fluid clutch is closed. Therefore, the textured roll 3 and the output shaft of the speed reducer 1 are basically completely isolated, that is, the driving torque of the output shaft of the speed reducer 1 has almost no driving effect on the textured roll 3. Therefore, even if there is a large diameter difference between the smooth roll and the textured roll 3, the speed reducer will not generate closed torque.

[0029] The parts not detailed in the present invention are the prior art.

Claims

1. A driving method for an EDT rolling texturing roll of an aluminum alloy sheet. An outer circumferential surface of a driving side shaft head of the texturing roll (3) is rotatably provided with a flat head sleeve (4), and a blind cover (8) is fixedly arranged on an outer side end surface of the flat head sleeve (4); the flat head sleeve (4) is rotatably connected with the driving side shaft head of the texturing roll (3) through a bearing (5) or a bearing bush (10); characterized in that: During the EDT rolling process of aluminum alloy sheets, in the acceleration stage at the initial stage of rolling and the normal rolling stage of aluminum alloy sheets, the textured roll (3) is driven to rotate by the aluminum alloy sheet being rolled.

2. A driving method for an EDT rolling texturing roll of an aluminum alloy sheet. An outer cylindrical surface of a driving side shaft head of the texturing roll (3) is rotatably provided with a flat head sleeve (4), and a blanking cover (8) is fixedly arranged on an outer end face of the flat head sleeve (4); the flat head sleeve (4) is rotatably connected with the driving side shaft head of the texturing roll (3) through a bearing (5) or a bearing bush (10); a clutch (9) is arranged between the blanking cover (8) and an end face of the driving side shaft head of the texturing roll (3); characterized in that: During the EDT rolling process of aluminum alloy sheets, in the acceleration stage at the initial stage of rolling, the textured roll (3) is jointly driven by the aluminum alloy sheet being rolled and the clutch (9) to accelerate and rotate; During the normal rolling stage of aluminum alloy sheets, the textured roll (3) is driven to rotate by the aluminum alloy sheet being rolled to maintain synchronization with the rolling speed of the aluminum alloy sheet.

3. The driving method of the EDT rolling texturing roll for aluminum alloy sheets according to claim 2, characterized in that: The clutch (9) uses an electromagnetic clutch or a magnetorheological fluid clutch.

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