Preparation method of 6101 aluminum alloy plate for conductive flexible connection

Abstract

The invention discloses a preparation method of a 6101 aluminum alloy plate for conductive flexible connection, and aims to solve the problem of low conductivity of a traditional process. The method comprises the steps of smelting and casting, sawing and milling treatment, heating and hot rolling, cold rolling, incomplete solid solution, secondary cold rolling, aging and the like. Solid solution elements are reduced by controlling raw material components, the process of ingot casting, hot rolling, cold rolling, incomplete solid solution, cold rolling and aging is adopted, the conductivity is improved through incomplete solid solution, the strength loss is made up through subsequent cold rolling, and the mechanical property and the bending property are guaranteed through accurate aging. The thickness of the product is 0.2 mm-0. 5mm, and the product has high conductivity, strength and good bending performance, can effectively replace a copper foil and a 1060 aluminum foil, and is suitable for the field of conductive flexible connection.

Description

Technical Field

[0001] This invention belongs to the field of aluminum alloy processing and manufacturing technology, and specifically relates to a method for preparing 6-series aluminum alloy coils for conductive flexible connections. Background Technology

[0002] In the new energy vehicle industry, the materials used in conductive flexible interconnect products are mainly copper foil and 1060 aluminum foil, with a thickness range of 0.2-0.5mm. While copper foil offers stable performance, it is relatively expensive and heavy, while 1060 aluminum foil, although meeting lightweight requirements, has relatively low strength.

[0003] 6101 aluminum alloy, as a low-alloy aluminum alloy, is strengthened primarily by introducing Mg and Si elements. The strength of the product is improved through the solid solution effect of Mg or the formation of a Mg₂Si dispersed phase. However, the introduction of alloying elements forms a solid solution with the aluminum matrix. This process causes distortion of the matrix lattice, increases electron scattering, and ultimately leads to a decrease in the material's electrical conductivity. Summary of the Invention

[0004] In view of this, the present invention discloses a method for preparing 6101 aluminum alloy sheet for conductive flexible connectors, comprising the following steps:

[0005] S1. The 6101 aluminum alloy raw material is put into the melting furnace for melting, and then cast to obtain 6101 aluminum alloy flat ingots;

[0006] S2. Sawing the ingot derrick and gate of the 6014A aluminum alloy flat ingot and milling the solidified shell layer on its surface.

[0007] S3. The milled ingot is heated in a pusher furnace at a temperature of 480-560℃ for 2-12 hours.

[0008] S4. Hot rolling of the heated 6101 aluminum alloy flat ingot at a final rolling temperature of 290-330℃ to obtain a 6101 aluminum alloy hot-rolled coil with a good surface.

[0009] S5. Cool the 6101 aluminum alloy hot-rolled coil to room temperature and then cold-roll and coil it to obtain a 6101 aluminum alloy cold-rolled coil.

[0010] S6. The 6101 aluminum alloy cold-rolled sheet obtained in step S5 is subjected to solution treatment. The solution treatment process involves heating the 6101 aluminum alloy cold-rolled coil to 440℃~460℃, holding it at that temperature for 30 seconds, and then water-quenching it to room temperature.

[0011] S7. The 6101 aluminum alloy cold-rolled sheet after solution treatment is cold-rolled again;

[0012] S8. The cold-rolled 6101 aluminum alloy sheet is straightened and cleaned;

[0013] S9. After straightening and cleaning, the 6101 aluminum alloy cold-rolled sheet is subjected to aging treatment to obtain 6101 aluminum alloy sheet.

[0014] The traditional production process of 6101 aluminum alloy is: ingot casting - hot rolling - cold rolling - solution treatment - aging. The above process achieves the mechanical properties of the material by aging or over-aging treatment after full solution treatment, but the problem caused by this is that the electrical conductivity is low.

[0015] The production process of this application is as follows: ingot casting - hot rolling - cold rolling - incomplete solution treatment - cold rolling - aging. Performance optimization is achieved through three key steps: first, by using incomplete solution treatment, its conductivity is improved; then, through cold rolling after incomplete solution treatment, the work hardening effect generated during cold rolling improves the strength of the aluminum alloy sheet, compensating for the strength loss caused by incomplete solution treatment; finally, by precisely controlling the aging process, the bending performance is significantly improved while ensuring the mechanical properties of the product. This produces 6101 aluminum alloy sheets with a thickness range of 0.2mm~0.5mm, which have high electrical conductivity, strength and good bending performance, and can effectively replace copper foil and 1060 aluminum foil.

[0016] As a supplement to the technical solution of the present invention, in step S1, the 6101 aluminum alloy raw material is as follows by mass fraction: 0.35%≤Si≤0.5%, Fe≤0.1%, Cu≤0.05%, Mn≤0.01%, 0.35%≤Mg≤0.55%, Cr≤0.01%, Zn≤0.05%, B≤0.06%, single impurity ≤0.05%, total impurities ≤0.15%, and the balance is Al.

[0017] In this application, to ensure the electrical conductivity of the material, the content of solid solution elements in the aluminum body is reduced, thereby achieving both improved electrical conductivity and guaranteed strength.

[0018] As a supplement to the technical solution of this invention, in step S1, the aluminum alloy melting temperature is 730℃~760℃. After melting, the molten aluminum alloy is transferred to a holding furnace, where a chlorine-argon mixed gas is introduced for refining for 0.5-2 hours. The casting temperature is 670℃~690℃, the casting speed is 45~55mm / min, and argon gas is introduced into the casting channel to remove hydrogen. AlTi5B1 refining agent is added to refine the ingot grains.

[0019] As a supplement to the technical solution of the present invention, in step S2, the ingot drawing end is sawn 400mm, the gate end is sawn 150mm, and then the upper and lower surfaces of the flat ingot are milled 12mm, and the side surface is milled 7mm.

[0020] As a supplement to the technical solution of the present invention, in step S5, the cold rolling rate is 60%~90%. A large processing rate is beneficial to the recrystallization and nucleation of grains in the subsequent solid solution process, which refines the grains and improves the product strength and bending performance.

[0021] As a supplement to the technical solution of the present invention, in step S7, one to three cold rolling passes are performed. As the degree of work hardening increases, the processing rate is gradually reduced to prevent the product from cracking at the edges.

[0022] Specifically, when 70% < total cold rolling processing rate ≤ 85% in step S7, three passes of cold rolling are performed, with processing rates of 40%-50%, 30%-40%, and 25%-35% respectively.

[0023] When 50% < total cold rolling processing rate ≤ 75% in step S7, two-pass cold rolling is performed, with processing rates of 40%-50% and 30%-40% respectively.

[0024] When the total cold rolling processing rate in step S7 is ≤50%, cold rolling is performed in one pass, with a pass processing rate ≤50%.

[0025] As a supplement to the technical solution of this invention, in step S9, the aging process involves heating to 200℃~250℃ and holding at that temperature for 6h~10h. While aging improves the tensile properties of the product, it also leads to softening due to work hardening, grain recovery, and recrystallization, thus improving the product's bending properties. By adjusting the aging process, the strength and bending properties of the product are balanced.

[0026] Beneficial effects: This invention optimizes the traditional 6101 aluminum alloy production process by using a process of melting and casting, hot rolling, cold rolling, incomplete solution treatment, cold rolling, and aging. Incomplete solution treatment improves electrical conductivity, while cold rolling hardens the material to enhance strength, thus compensating for the strength loss caused by incomplete solution treatment. Finally, by controlling the aging process, the mechanical properties of the product are guaranteed while the bending performance is improved. This results in the production of 6101 aluminum alloy sheets with high electrical conductivity, mechanical properties, and bending performance, meeting the requirements for conductive flexible interconnect products in the new energy vehicle field. Detailed Implementation

[0027] The embodiments of the present invention will be described in further detail below. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0028] Example 1:

[0029] A method for preparing 6101 aluminum alloy sheet for conductive flexible connectors includes the following steps:

[0030] S1. Prepare the 6101 aluminum alloy raw materials by mass fraction as follows: Si: 0.41%, Fe: 0.07%, Cu: 0.02%, Mn: 0.01%, Mg: 0.43%, Cr: 0.01%, Zn: 0.03%, B: 0.01%, individual impurities ≤0.05%, total impurities ≤0.15%, and the balance is Al.

[0031] The 6101 aluminum alloy raw material was put into a melting furnace for melting at a temperature of 730℃. After melting, the molten aluminum alloy was transferred to a holding furnace, where a chlorine-argon mixed gas was introduced for refining for 1 hour. The casting temperature was 670℃, the casting speed was 52 mm / min, and argon gas was introduced into the casting channel to remove hydrogen. AlTi5B1 grain refiner was added to refine the ingot grains, and then casting was performed to obtain 6101 aluminum alloy flat ingots.

[0032] S2. Sawing the ingot drawing end and the gate end of the 6014A aluminum alloy flat ingot, and milling the solidified shell layer on its surface. Sawing the ingot drawing end 400mm and the gate end 150mm, then milling the upper and lower surfaces of the flat ingot 12mm and the side surface 7mm.

[0033] S3. The milled ingot is heated in a pusher furnace at a temperature of 520℃ for 8 hours.

[0034] S4. The heated 6101 aluminum alloy flat ingot is hot rolled at a final rolling temperature of 300℃ to obtain a 3mm thick 6101 aluminum alloy hot-rolled coil with a good surface.

[0035] S5. Cool the 6101 aluminum alloy hot-rolled coil to room temperature and then cold-roll it to 1 mm before coiling it to obtain a 6101 aluminum alloy cold-rolled coil with a processing rate of 66.67%.

[0036] S6. The 6101 aluminum alloy cold-rolled sheet obtained in step S5 is subjected to solution treatment. The solution treatment process is to heat the 6101 aluminum alloy cold-rolled coil to 455°C, hold it for 30 seconds, and then water-quench it to room temperature.

[0037] S7. Perform one cold rolling pass on the solution-treated 6101 aluminum alloy cold-rolled sheet. The first cold rolling pass reduces the sheet thickness from 1.0 mm to 0.5 mm.

[0038] S8. The cold-rolled 6101 aluminum alloy sheet is straightened and cleaned;

[0039] S9. After straightening and cleaning, the 6101 aluminum alloy cold-rolled sheet is subjected to aging treatment. The aging process is to heat to 240℃ and hold for 6 hours. After aging, 6101 aluminum alloy sheet is obtained.

[0040] Example 2:

[0041] A method for preparing 6101 aluminum alloy sheet for conductive flexible connectors includes the following steps:

[0042] S1. Prepare the 6101 aluminum alloy raw materials by mass fraction as follows: Si: 0.39%, Fe: 0.06%, Cu: 0.02%, Mn: 0.01%, Mg: 0.41%, Cr: 0.01%, Zn: 0.03%, B: 0.01%, individual impurities ≤0.05%, total impurities ≤0.15%, and the balance is Al.

[0043] The 6101 aluminum alloy raw material was put into a melting furnace for melting at a temperature of 730℃. After melting, the molten aluminum alloy was transferred to a holding furnace, where a chlorine-argon mixed gas was introduced for refining for 1 hour. The casting temperature was 670℃, the casting speed was 51 mm / min, and argon gas was introduced into the casting channel to remove hydrogen. AlTi5B1 grain refiner was added to refine the ingot grains, and then casting was performed to obtain 6101 aluminum alloy flat ingots.

[0044] S2. Sawing the ingot drawing end and the gate end of the 6014A aluminum alloy flat ingot, and milling the solidified shell layer on its surface. Sawing the ingot drawing end 400mm and the gate end 150mm, then milling the upper and lower surfaces of the flat ingot 12mm and the side surface 7mm.

[0045] S3. The milled ingot is heated in a pusher furnace at a temperature of 520℃ for 8 hours.

[0046] S4. The heated 6101 aluminum alloy flat ingot is hot rolled at a final rolling temperature of 308℃ to obtain a 3mm thick 6101 aluminum alloy hot-rolled coil with a good surface.

[0047] S5. Cool the 6101 aluminum alloy hot-rolled coil to room temperature and then cold-roll it to 1 mm before coiling it to obtain a 6101 aluminum alloy cold-rolled coil with a processing rate of 66.67%.

[0048] S6. The 6101 aluminum alloy cold-rolled sheet obtained in step S5 is subjected to solution treatment. The solution treatment process is to heat the 6101 aluminum alloy cold-rolled coil to 455°C, hold it for 30 seconds, and then water-quench it to room temperature.

[0049] S7. The 6101 aluminum alloy cold-rolled sheet after solution treatment is subjected to two cold rolling passes. The first cold rolling reduces the sheet thickness from 1.0 mm to 0.6 mm, and the second cold rolling reduces the sheet thickness from 0.6 mm to 0.4 mm.

[0050] S8. The cold-rolled 6101 aluminum alloy sheet is straightened and cleaned;

[0051] S9. After straightening and cleaning, the 6101 aluminum alloy cold-rolled sheet is subjected to aging treatment. The aging process is to heat to 230℃ and hold for 8 hours. After aging, 6101 aluminum alloy sheet is obtained.

[0052] Example 3:

[0053] A method for preparing 6101 aluminum alloy sheet for conductive flexible connectors includes the following steps:

[0054] S1. Prepare the 6101 aluminum alloy raw materials by mass fraction as follows: Si: 0.39%, Fe: 0.06%, Cu: 0.02%, Mn: 0.01%, Mg: 0.41%, Cr: 0.01%, Zn: 0.03%, B: 0.01%, individual impurities ≤0.05%, total impurities ≤0.15%, and the balance is Al.

[0055] The 6101 aluminum alloy raw material was put into a melting furnace for melting at a temperature of 730℃. After melting, the molten aluminum alloy was transferred to a holding furnace, where a chlorine-argon mixed gas was introduced for refining for 1 hour. The casting temperature was 690℃, the casting speed was 53 mm / min, and argon gas was introduced into the casting channel to remove hydrogen. AlTi5B1 grain refiner was added to refine the ingot grains, and then casting was performed to obtain 6101 aluminum alloy flat ingots.

[0056] S2. Sawing the ingot drawing end and the gate end of the 6014A aluminum alloy flat ingot, and milling the solidified shell layer on its surface. Sawing the ingot drawing end 400mm and the gate end 150mm, then milling the upper and lower surfaces of the flat ingot 12mm and the side surface 7mm.

[0057] S3. The milled ingot is heated in a pusher furnace at a temperature of 520℃ for 8 hours.

[0058] S4. The heated 6101 aluminum alloy flat ingot is hot rolled at a final rolling temperature of 304℃ to obtain a 3mm thick 6101 aluminum alloy hot-rolled coil with a good surface.

[0059] S5. Cool the 6101 aluminum alloy hot-rolled coil to room temperature and then cold-roll it to 1 mm before coiling it to obtain a 6101 aluminum alloy cold-rolled coil with a processing rate of 66.67%.

[0060] S6. The 6101 aluminum alloy cold-rolled sheet obtained in step S5 is subjected to solution treatment. The solution treatment process is to heat the 6101 aluminum alloy cold-rolled coil to 450°C, hold it for 30 seconds, and then water-quench it to room temperature.

[0061] S7. The 6101 aluminum alloy cold-rolled sheet after solution treatment is subjected to two cold rolling passes. The first cold rolling reduces the sheet thickness from 1.0 mm to 0.5 mm, and the second cold rolling reduces the sheet thickness from 0.5 mm to 0.3 mm.

[0062] S8. The cold-rolled 6101 aluminum alloy sheet is straightened and cleaned;

[0063] S9. After straightening and cleaning, the 6101 aluminum alloy cold-rolled sheet is subjected to aging treatment. The aging process is to heat to 220℃ and hold for 8 hours. After aging, 6101 aluminum alloy sheet is obtained.

[0064] Example 4:

[0065] A method for preparing 6101 aluminum alloy sheet for conductive flexible connectors includes the following steps:

[0066] S1. Prepare the 6101 aluminum alloy raw materials by mass fraction as follows: Si: 0.39%, Fe: 0.06%, Cu: 0.02%, Mn: 0.01%, Mg: 0.41%, Cr: 0.01%, Zn: 0.03%, B: 0.01%, individual impurities ≤0.05%, total impurities ≤0.15%, and the balance is Al.

[0067] The 6101 aluminum alloy raw material was put into a melting furnace for melting at a temperature of 740℃. After melting, the molten aluminum alloy was transferred to a holding furnace, where a chlorine-argon mixed gas was introduced for refining for 1 hour. The casting temperature was 680℃, the casting speed was 50 mm / min, and argon gas was introduced into the casting channel to remove hydrogen. AlTi5B1 grain refiner was added to refine the ingot grains, and then casting was performed to obtain 6101 aluminum alloy flat ingots.

[0068] S2. Sawing the ingot drawing end and the gate end of the 6014A aluminum alloy flat ingot, and milling the solidified shell layer on its surface. Sawing the ingot drawing end 400mm and the gate end 150mm, then milling the upper and lower surfaces of the flat ingot 12mm and the side surface 7mm.

[0069] S3. The milled ingot is heated in a pusher furnace at a temperature of 520℃ for 8 hours.

[0070] S4. The heated 6101 aluminum alloy flat ingot is hot rolled at a final rolling temperature of 316℃ to obtain a 3mm thick 6101 aluminum alloy hot-rolled coil with a good surface.

[0071] S5. Cool the 6101 aluminum alloy hot-rolled coil to room temperature and then cold-roll it to 1 mm before coiling it to obtain a 6101 aluminum alloy cold-rolled coil with a processing rate of 66.67%.

[0072] S6. The 6101 aluminum alloy cold-rolled sheet obtained in step S5 is subjected to solution treatment. The solution treatment process is to heat the 6101 aluminum alloy cold-rolled coil to 445°C, hold it for 30 seconds, and then water-quench it to room temperature.

[0073] S7. The solution-treated 6101 aluminum alloy cold-rolled sheet is subjected to three cold rolling passes. The first cold rolling reduces the sheet thickness from 1.0 mm to 0.5 mm, the second cold rolling reduces the sheet thickness from 0.5 mm to 0.3 mm, and the third cold rolling reduces the sheet thickness from 0.3 mm to 0.2 mm.

[0074] S8. The cold-rolled 6101 aluminum alloy sheet is straightened and cleaned;

[0075] S9. After straightening and cleaning, the 6101 aluminum alloy cold-rolled sheet is subjected to aging treatment. The aging process is to heat to 210℃ and hold for 9 hours. After aging, 6101 aluminum alloy sheet is obtained.

[0076] The mechanical properties and electrical conductivity of the 6101 aluminum alloy sheets prepared in Examples 1 to 4 were tested, and the results are shown in the table below.

[0077] Table 1.6101 Aluminum Alloy Sheet Tensile Properties and Electrical Conductivity

[0078]

[0079] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing 6101 aluminum alloy sheet for conductive flexible connectors, characterized in that, Includes the following steps: S1. The 6101 aluminum alloy raw material is put into the melting furnace for melting, and then cast to obtain 6101 aluminum alloy flat ingots; S2. Sawing the ingot end and gate end of the 6014A aluminum alloy flat ingot, and milling the solidified shell layer on its surface; S3. The milled ingot is heated in a pusher furnace at a temperature of 480-560℃ for 2-12 hours. S4. Hot rolling of the heated 6101 aluminum alloy flat ingot at a final rolling temperature of 290-330℃ to obtain 6101 aluminum alloy hot-rolled plate. S5. Cold-roll and coil the 6101 aluminum alloy hot-rolled sheet to obtain a 6101 aluminum alloy cold-rolled sheet; S6. The 6101 aluminum alloy cold-rolled sheet obtained in step S5 is subjected to solution treatment. The solution treatment process is to heat the 6101 aluminum alloy cold-rolled sheet to 440℃~460℃, hold it for 30s, and then perform gas quenching. S7. The 6101 aluminum alloy cold-rolled sheet after solution treatment is cold-rolled again; S8. The cold-rolled 6101 aluminum alloy sheet is straightened and cleaned; S9. After straightening and cleaning, the 6101 aluminum alloy cold-rolled sheet is subjected to aging treatment to obtain 6101 aluminum alloy sheet.

2. The method for preparing a 6101 aluminum alloy sheet for conductive flexible connectors according to claim 1, characterized in that, In step S1, the 6101 aluminum alloy raw material is as follows by mass fraction: 0.35%≤Si≤0.5%, Fe≤0.1%, Cu≤0.05%, Mn≤0.01%, 0.35%≤Mg≤0.55%, Cr≤0.01%, Zn≤0.05%, B≤0.06%, single impurity ≤0.05%, total impurities ≤0.15%, and the balance is Al.

3. The method for preparing a 6101 aluminum alloy sheet for conductive flexible connectors according to claim 1, characterized in that, In step S1, the aluminum alloy melting temperature is 730℃~760℃. After melting, the molten aluminum alloy is transferred to a holding furnace, where a chlorine-argon mixed gas is introduced for refining for 0.5-2 hours. The casting temperature is 670℃~690℃, the casting speed is 45~55mm / min, and argon gas is introduced into the casting channel to remove hydrogen. AlTi5B1 refining agent is added to refine the ingot grains.

4. The method for preparing a 6101 aluminum alloy sheet for conductive flexible connectors according to claim 1, characterized in that, In step S2, the ingot drawing end is sawn 400mm and the gate end is sawn 150mm. Then, the upper and lower surfaces of the flat ingot are milled 12mm and the side surface is milled 7mm.

5. The method for preparing a 6101 aluminum alloy sheet for conductive flexible connectors according to claim 1, characterized in that, In step S5, the cold rolling rate is 60%~90%.

6. The method for preparing a 6101 aluminum alloy sheet for conductive flexible connectors according to claim 1, characterized in that, In step S7, one to three cold rolling passes are performed. When 70% < total cold rolling processing rate ≤ 85% in step S7, three passes of cold rolling are performed, with processing rates of 40%-50%, 30%-40%, and 25%-35% respectively. When 50% < total cold rolling processing rate ≤ 75% in step S7, two-pass cold rolling is performed, with processing rates of 40%-50% and 30%-40% respectively. When the total cold rolling processing rate in step S7 is ≤50%, cold rolling is performed in one pass, with a pass processing rate ≤50%.

7. The method for preparing a 6101 aluminum alloy sheet for conductive flexible connectors according to claim 1, characterized in that, In step S9, the aging process involves heating to 200℃~250℃ and holding for 6h~10h.

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