Secondary annealing production process and device for aluminum foil

Abstract

The invention discloses a secondary annealing production process and device for an aluminum foil, which comprises the following steps of: continuously rolling a blank twice to reduce the thickness, annealing for the first time, continuously reducing the thickness through continuous rolling twice, annealing for the second time, and continuously rolling twice to obtain a final finished product aluminum foil. The traditional primary annealing process is optimized into the secondary annealing process, and the blank is rolled before and after each time of annealing, so that the elongation of the obtained aluminum foil is improved, and the surface of the aluminum foil is free from the defects of dark surface and bright spots.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aluminum foil production, in particular to a secondary annealing production process and device for aluminum foil. BACKGROUND

[0002] The aluminum alloy coil is usually a product after the aluminum alloy plate is continuously rolled and thinned by a press and then is coiled by a coiling machine. The aluminum alloy coil in the prior art adopts 1235H14 blank, but the produced aluminum alloy coil has dark bright spots. In order to solve this problem, 8011 blank is used, but only one annealing is usually performed in the production process, so that the elongation of the produced product is less than 7%, thereby failing to meet the requirements. SUMMARY

[0003] In order to solve the above problems in the prior art, the present application provides a secondary annealing production process and device for aluminum foil.

[0004] In order to achieve the above technical effects, the present application adopts the following scheme:

[0005] A secondary annealing production process for aluminum foil, comprising the following steps:

[0006] S1, preparing a blank, selecting 8011 blank;

[0007] S2, performing first rolling on the blank to thin the thickness of the blank to 6.8mm;

[0008] S3, performing second rolling on the blank to thin the thickness of the blank to 3.8mm;

[0009] S4, performing first annealing on the blank thinned to 3.8mm;

[0010] S5, performing third rolling on the blank after the first annealing to thin the thickness of the blank to 1.8mm;

[0011] S6, performing fourth rolling on the blank to thin the thickness of the blank to 0.8mm;

[0012] S7, performing second annealing on the blank thinned to 0.8mm;

[0013] S8, performing fifth rolling on the blank after the second annealing to thin the thickness of the blank to 0.4mm;

[0014] S9, performing sixth rolling on the blank to thin the thickness of the blank to 0.03mm to obtain finished aluminum foil.

[0015] In the preferred technical scheme, the temperature rising, temperature keeping and temperature falling in the first annealing process are designed as 200℃ / 4h-580℃ / 23h.

[0016] The preferred technical solution is that the heating, holding and cooling processes in the second annealing process are designed as follows: 200℃ / 4h-340℃ / 240℃-300℃ / 260℃+2h.

[0017] In the preferred technical solution, the interval between the first annealing and the second annealing is 2-5 hours.

[0018] A secondary annealing production apparatus for aluminum foil includes a feeding mechanism, a first rolling mechanism, a first winding mechanism, a first annealing furnace, a second rolling mechanism, a second winding mechanism, a second annealing furnace, a third rolling mechanism, and a third winding mechanism arranged sequentially; wherein the first rolling mechanism, the second rolling mechanism, and the third rolling mechanism each have two continuous rolling sections.

[0019] In a preferred embodiment, the feeding mechanism includes a feeding platform, a push rod, a drive block, a drive screw, and a first motor. One end of the feeding platform is located near the first rolling mechanism. Two side blocks protrude from the upper end of the feeding platform along its length. The two side blocks are spaced apart, and a push rod that moves on the feeding platform is perpendicularly between the two side blocks. Each side block has a strip-shaped through hole parallel to its length direction. A sliding slider is fitted inside the strip-shaped through hole. One end of the slider is fixedly connected to the push rod, and the other end of the slider extends out of the side block and is fixedly connected to the drive block. A threaded hole is horizontally opened through the drive block. The drive screw is horizontally positioned and fits through the threaded hole. The drive screw is rotatably mounted on the side block and driven to rotate by the first motor mounted on the feeding platform.

[0020] In a preferred embodiment, the first rolling mechanism, the second rolling mechanism, and the third rolling mechanism have identical structures. The first rolling mechanism includes two rolling sections arranged sequentially along the feeding direction. Each rolling section includes a first support frame, a support roll, a rolling roll, and a second motor. Both the support roll and the rolling roll are rotatably mounted on the first support frame. The length of both the support roll and the rolling roll is perpendicular to the feeding direction. The rolling roll is located above the support roll. The rolling roll is driven to rotate by the second motor mounted on the first support frame. Both ends of the support roll are provided with a limiting edge protruding from the circumferential wall of the support roll. The limiting edge is arranged in a ring around the circumference of the support roll. The rolling roll rotates while pressing against the limiting edge. The distance between the rolling roll and the support roll matches the thickness of the aluminum plate to be rolled.

[0021] In a preferred embodiment, the first rolling mechanism, the second rolling mechanism, and the third rolling mechanism have the same structure. The first rolling mechanism includes a second support frame, a rolling shaft, and a third motor. The rolling shaft is rotatably mounted on the second support frame and is driven to rotate by the third motor. The length direction of the rolling shaft is perpendicular to the feeding direction.

[0022] In a preferred embodiment, the first annealing furnace and the second annealing furnace have the same structure. The first annealing furnace includes an outer shell. The outer shell has material inlets on its opposite side walls along the feeding direction. A lifting and closing door is provided at each material inlet. Vertical slide rails are provided on both sides of the material inlets. The closing door has a sliding groove that matches the slide rail. The closing door is mounted on the slide rail and slides through the sliding groove. A hydraulic cylinder for driving the closing door to slide vertically is installed on the outer shell. Several heating tubes are provided on the inner wall of the outer shell.

[0023] In a preferred embodiment, the first rolling mechanism is mounted on a first track and moves, and the second rolling mechanism is mounted on a second track and moves. The first track and the second track have the same structure. The first track is set along the feeding direction and passes through the material inlets on both sides of the first annealing furnace. A slide block is slidably mounted on the first track, and the first rolling mechanism is mounted on the slide block. The sliding is driven by a first screw mechanism set along the first track.

[0024] Compared with existing technologies, the beneficial effects are:

[0025] In this invention, the elongation of the obtained aluminum foil is improved by optimizing the traditional single-stage annealing process into a two-stage annealing process, and the blank is rolled before and after each annealing, thereby eliminating defects such as dark and bright spots on the surface of the aluminum foil. Attached Figure Description

[0026] Figure 1 This is a process flow diagram of the present invention;

[0027] Figure 2 This is a schematic diagram of the device structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the feeding structure in this invention;

[0029] Figure 4 This is a schematic diagram of the first rolling mechanism in this invention;

[0030] Figure 5 This is a schematic diagram of the structure of the first track and the first annealing furnace in this invention.

[0031] Reference numerals: 1. Feeding mechanism; 2. First rolling mechanism; 3. First rolling mechanism; 4. First annealing furnace; 5. First track; 6. Second rolling mechanism; 7. Second rolling mechanism; 8. Second annealing furnace; 9. Third rolling mechanism; 10. Third rolling mechanism; 11. Second track; 12. Feeding platform; 13. Side baffle; 14. Strip-shaped through hole; 15. Drive block; 16. Drive screw; 17. First motor; 18. First support frame; 19. Support roller; 20. Rolling roller; 21. Second support frame; 22. Slide block; 23. Outer shell; 24. Enclosing door; 25. Hydraulic cylinder; 26. Rolling roller; 27. Slide rail. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] A secondary annealing process for aluminum foil includes the following steps:

[0034] S1. Prepare the raw material, select 8011 raw material;

[0035] S2. Perform the first rolling on the billet to reduce its thickness to 6.8 mm;

[0036] S3. Perform a second rolling process on the billet to reduce its thickness to 3.8 mm;

[0037] S4. Perform the first annealing on the blank rolled to 3.8 mm;

[0038] S5. The billet after the first annealing is rolled a third time to reduce the thickness of the billet to 1.8 mm.

[0039] S6. Perform a fourth rolling process on the billet to reduce its thickness to 0.8 mm;

[0040] S7. Perform a second annealing on the billet rolled to 0.8 mm;

[0041] S8. The billet after the second annealing is rolled for the fifth time to reduce the thickness of the billet to 0.4 mm.

[0042] S9. The blank is rolled for the sixth time to reduce its thickness to 0.03 mm to obtain the finished aluminum foil.

[0043] By optimizing the traditional single-stage annealing process into a two-stage annealing process, and rolling the blank before and after each annealing, the elongation of the obtained aluminum foil is improved, resulting in an elongation greater than 9% when the product thickness is between 0.03 and 0.036 mm, and the aluminum foil surface is free of defects such as dark spots and bright spots.

[0044] The preferred technical solution is that the heating, holding and cooling processes in the first annealing process are designed to be 200℃ / 4h-580℃ / 23h.

[0045] The preferred technical solution is that the heating, holding and cooling processes in the second annealing process are designed as follows: 200℃ / 4h-340℃ / 240℃-300℃ / 260℃+2h.

[0046] In the preferred technical solution, the interval between the first annealing and the second annealing is 2-5 hours.

[0047] A secondary annealing production apparatus for aluminum foil includes a feeding mechanism 1, a first rolling mechanism 2, a first rolling mechanism 3, a first annealing furnace 4, a second rolling mechanism 6, a second rolling mechanism 7, a second annealing furnace 8, a third rolling mechanism 9, and a third rolling mechanism 10 arranged sequentially; wherein the first rolling mechanism 2, the second rolling mechanism 6, and the third rolling mechanism 9 each have two continuous rolling sections.

[0048] In a preferred embodiment, the feeding mechanism 1 includes a feeding platform 12, a push rod, a drive block 15, a drive screw 16, and a first motor 17. One end of the feeding platform 12 is located near the first rolling mechanism 2. Two side blocks 13 protrude from the upper end of the feeding platform 12 along its length. The two side blocks 13 are spaced apart, and a push rod that moves on the feeding platform 12 is vertically positioned between the two side blocks 13. A strip-shaped through hole 14 parallel to the length direction of the side block 13 is provided on the side block 13. A sliding slider is matched in the strip-shaped through hole 14. One end of the slider is fixedly connected to the push rod, and the other end of the slider extends out of the side block 13 and is fixedly connected to the drive block 15. A threaded hole is horizontally opened through the drive block 15. The drive screw 16 is horizontally positioned and matches the threaded hole. The drive screw 16 is rotatably mounted on the side block 13 and driven to rotate by the first motor 17 mounted on the feeding platform 12.

[0049] In a preferred embodiment, the first rolling mechanism 2, the second rolling mechanism 6, and the third rolling mechanism 9 have identical structures. The first rolling mechanism 2 includes two rolling sections arranged sequentially along the feeding direction. Each rolling section includes a first support frame 18, a support roller 19, a rolling roller 20, and a second motor. The support roller 19 and the rolling roller 20 are rotatably mounted on the first support frame 18. The lengths of the support roller 19 and the rolling roller 20 are perpendicular to the feeding direction. The rolling roller 20 is located above the support roller 19. The rolling roller 20 is driven to rotate by the second motor mounted on the first support frame 18. Each end of the support roller 19 has a limiting edge protruding from its circumferential wall. The limiting edge is arranged in a ring around the circumference of the support roller 19. The rolling roller 20 rotates while pressing against the limiting edge. The distance between the rolling roller 20 and the support roller 19 matches the thickness of the aluminum plate to be rolled.

[0050] In a preferred embodiment, the first rolling mechanism 3, the second rolling mechanism 7, and the third rolling mechanism 10 have the same structure. The first rolling mechanism 3 includes a second support frame 21, a rolling shaft, and a third motor. The rolling shaft is rotatably mounted on the second support frame 21 and is driven to rotate by the third motor. The length direction of the rolling shaft is perpendicular to the feeding direction.

[0051] In a preferred embodiment, the first annealing furnace 4 and the second annealing furnace 8 have the same structure. The first annealing furnace 4 includes an outer shell 23. The outer shell 23 has material inlets on its opposite side walls along the feeding direction. A lifting and closing door 24 is provided at each material inlet. Vertical slide rails 27 are provided on both sides of the material inlet. The closing door 24 has a sliding groove that matches the slide rail 27. The closing door 24 is mounted on the slide rail 27 and slides through the sliding groove. A hydraulic cylinder 25 is installed on the outer shell 23 to drive the closing door 24 to slide vertically. A plurality of heating tubes are provided on the inner wall of the outer shell 23.

[0052] In a preferred embodiment, the first rolling mechanism 3 is mounted on the first track 5 and moves, and the second rolling mechanism 7 is mounted on the second track 11 and moves. The first track 5 and the second track 11 have the same structure. The first track 5 is set along the feeding direction and passes through the material inlets on both sides of the first annealing furnace 4. A slide block 22 is slidably mounted on the first track 5, and the first rolling mechanism 3 is mounted on the slide block 22. The sliding is driven by a first screw mechanism set along the first track 5.

[0053] Working principle description: The billet is placed on the feeding platform 12 between the side stops 13 on both sides, and the push rod is pressed against the rear end of the billet. Then, the first motor 17 drives the drive screw 16 to rotate, thereby driving the push rod to move on the feeding platform 12, pushing the billet towards the first rolling mechanism 2 for two consecutive rolling operations. The height of the upper end of the support roller 19 is the same as the height of the upper end of the feeding platform 12. The billet is conveyed to the upper end of the support roller 19 under the push of the push rod. The rolling roller 20 rotates under the drive of the second motor, squeezing the billet between the rolling roller 20 and the support roller 19, thereby rolling the billet. The width change of the billet during rolling is restricted by the limiting edges on both sides of the support roller 19. In the first rolling mechanism 3, the rolling shaft rotates under the drive of the third motor, rolling the billet through the first rolling mechanism 2. After the billet is rolled by the rolling mechanism 2, it is rolled into a roll. Then, the closed door 24 on one side of the first annealing furnace 4 is opened, and the first rolling mechanism 3 slides into the first annealing furnace 4 along the first track 5 under the drive of the first screw mechanism. The closed door 24 of the first annealing furnace 4 is closed, and the rolled billet is annealed in the first annealing furnace 4. After annealing, the closed door 24 on the other side of the first annealing furnace 4 is opened, and the first rolling mechanism 3 is sent to one side of the second rolling mechanism 6. After being rolled twice by the second rolling mechanism 6, the second rolling mechanism 7 rolls the billet into a roll and sends it into the second annealing furnace 8 for annealing. After annealing, it is moved to the side of the third rolling mechanism 9 and rolled twice by the third rolling mechanism 9 into a finished aluminum foil and then rolled into a roll by the third rolling mechanism 10.

[0054] The distance between the support roll 19 and the rolling roll 20 in the first rolling mechanism 2, the second rolling mechanism 6 and the third rolling mechanism 9 is reduced one by one according to the process requirements, thereby gradually reducing the thickness of the billet after rolling.

[0055] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0057] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention.

Claims

1. A secondary annealing production process of aluminum foil, characterized by, The method comprises the following steps: S1, preparing a blank, selecting a 8011 blank; S2, first rolling the blank to a thickness of 6.8mm; S3, second rolling the blank to a thickness of 3.8mm; S4, first annealing the blank rolled to a thickness of 3.8mm; S5, third rolling the blank after the first annealing to a thickness of 1.8mm; S6, fourth rolling the blank to a thickness of 0.8mm; S7, second annealing the blank rolled to a thickness of 0.8mm; S8, fifth rolling the blank after the second annealing to a thickness of 0.4mm; S9, sixth rolling the blank to a thickness of 0.03mm to obtain a finished aluminum foil.

2. The secondary annealing production process of aluminum foil according to claim 1, characterized in that, The temperature rising, temperature holding and temperature falling in the first annealing process are designed as 200℃ / 4h-580℃ / 23h.

3. The secondary annealing process for aluminum foil according to claim 1, wherein The temperature rising, temperature holding and temperature falling in the second annealing process are designed as 200℃ / 4h-340℃ / 240℃-300℃ / 260℃+2h.

4. The secondary annealing process for aluminum foil according to claim 1, wherein The interval between the first annealing and the second annealing is 2-5h.

5. An apparatus for producing secondary annealing of aluminum foil based on the production process according to claim 1, characterized by, The feeding mechanism (1), the first rolling mechanism (2), the first coiling mechanism (3), the first annealing furnace (4), the second rolling mechanism (6), the second coiling mechanism (7), the second annealing furnace (8), the third rolling mechanism (9) and the third coiling mechanism (10) are sequentially arranged; the first rolling mechanism (2), the second rolling mechanism (6) and the third rolling mechanism (9) each have two continuous rolling parts.

6. The apparatus for producing secondary annealing of aluminum foil according to claim 1, wherein The feeding mechanism (1) comprises a feeding platform (12), a pushing rod, a driving block (15), a driving screw rod (16) and a first motor (17); one end of the feeding platform (12) is arranged close to the first rolling mechanism (2) along the length direction; two side stops (13) are arranged on the upper end of the feeding platform (12) along the length direction; a pushing rod is arranged between the two side stops (13) and moves on the feeding platform (12); a strip-shaped through hole (14) is arranged on the side stop (13) and parallel to the length direction of the side stop (13); a sliding block is arranged in the strip-shaped through hole (14); one end of the sliding block is fixedly connected with the pushing rod; the other end of the sliding block extends out of the side stop (13) and is fixedly connected with the driving block (15); a threaded hole is horizontally arranged on the driving block (15); the driving screw rod (16) is horizontally arranged and matches the threaded hole; the driving screw rod (16) is rotatably arranged on the side stop (13) and is driven to rotate by the first motor (17) arranged on the feeding platform (12).

7. The apparatus for producing secondary annealing of aluminum foil according to claim 1, wherein The first rolling mechanism (2), the second rolling mechanism (6) and the third rolling mechanism (9) are consistent in structure, wherein the first rolling mechanism (2) comprises two rolling parts arranged in sequence along the feeding direction, the rolling part comprises a first support frame (18), a support roller (19), a rolling roller (20) and a second motor, the support roller (19) and the rolling roller (20) are rotatably mounted on the first support frame (18), the length of the support roller (19) and the rolling roller (20) is perpendicular to the feeding direction, the rolling roller (20) is located above the support roller (19), the rolling roller (20) is driven to rotate by the second motor mounted on the first support frame (18), the two ends of the support roller (19) are provided with a limiting guide protruding from the circumferential wall of the support roller (19), the limiting guide is arranged in a ring shape around the circumference of the support roller (19), the rolling roller (20) rotates on the limiting guide, and the distance between the rolling roller (20) and the support roller (19) matches the thickness of the aluminum plate to be rolled.

8. The apparatus for producing secondary annealing of aluminum foil according to claim 1, wherein The first rolling mechanism (2), the second rolling mechanism (6) and the third rolling mechanism (9) are consistent in structure, wherein the first rolling mechanism (2) comprises two rolling parts arranged in sequence along the feeding direction, the rolling part comprises a first support frame (18), a support roller (19), a rolling roller (20) and a second motor, the support roller (19) and the rolling roller (20) are rotatably mounted on the first support frame (18), the length of the support roller (19) and the rolling roller (20) is perpendicular to the feeding direction, the rolling roller (20) is located above the support roller (19), the rolling roller (20) is driven to rotate by the second motor mounted on the first support frame (18), the two ends of the support roller (19) are provided with a limiting guide protruding from the circumferential wall of the support roller (19), the limiting guide is arranged in a ring shape around the circumference of the support roller (19), the rolling roller (20) rotates on the limiting guide, and the distance between the rolling roller (20) and the support roller (19) matches the thickness of the aluminum plate to be rolled.

9. The apparatus for producing secondary annealing of aluminum foil according to claim 1, wherein The first rolling mechanism (2), the second rolling mechanism (6) and the third rolling mechanism (9) are consistent in structure, wherein the first rolling mechanism (2) comprises two rolling parts arranged in sequence along the feeding direction, the rolling part comprises a first support frame (18), a support roller (19), a rolling roller (20) and a second motor, the support roller (19) and the rolling roller (20) are rotatably mounted on the first support frame (18), the length of the support roller (19) and the rolling roller (20) is perpendicular to the feeding direction, the rolling roller (20) is located above the support roller (19), the rolling roller (20) is driven to rotate by the second motor mounted on the first support frame (18), the two ends of the support roller (19) are provided with a limiting guide protruding from the circumferential wall of the support roller (19), the limiting guide is arranged in a ring shape around the circumference of the support roller (19), the rolling roller (20) rotates on the limiting guide, and the distance between the rolling roller (20) and the support roller (19) matches the thickness of the aluminum plate to be rolled.

10. The apparatus for producing secondary annealing of aluminum foil according to claim 1, wherein The first rolling mechanism (2), the second rolling mechanism (6) and the third rolling mechanism (9) are consistent in structure, wherein the first rolling mechanism (2) comprises two rolling parts arranged in sequence along the feeding direction, the rolling part comprises a first support frame (18), a support roller (19), a rolling roller (20) and a second motor, the support roller (19) and the rolling roller (20) are rotatably mounted on the first support frame (18), the length of the support roller (19) and the rolling roller (20) is perpendicular to the feeding direction, the rolling roller (20) is located above the support roller (19), the rolling roller (20) is driven to rotate by the second motor mounted on the first support frame (18), the two ends of the support roller (19) are provided with a limiting guide protruding from the circumferential wall of the support roller (19), the limiting guide is arranged in a ring shape around the circumference of the support roller (19), the rolling roller (20) rotates on the limiting guide, and the distance between the rolling roller (20) and the support roller (19) matches the thickness of the aluminum plate to be rolled.

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