Rapid processing method of high-performance rolled copper foil

Abstract

The invention discloses a rapid processing method of a high-performance rolled copper foil material, and belongs to the technical field of rolled copper foils. A copper alloy base material is subjected to cold rolling, annealing treatment is conducted every two passes, the annealing temperature ranges from 200 DEG C to 600 DEG C, the annealing time ranges from 1 h to 5 h, the single-pass machining rate is not higher than 60%, and except the last pass, the other single-pass machining rates are not lower than 30%. According to the method for rapidly preparing the copper alloy rolled copper foil, the production speed can be greatly increased, compared with a traditional preparation mode, the copper alloy rolled copper foil has the better plate shape and the higher ductility, more importantly, the production efficiency is improved by one time or above, the production speed is increased to a great extent, and obvious preparation advantages are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of rolled copper foil, and in particular relates to a rapid processing method for a high-performance rolled copper foil material. Background Art

[0002] With the rapid development of communication, automobile, electronics, aerospace and other fields, the importance of communication is self-evident. As electronic equipment develops towards miniaturization and high density, copper foil, as one of the basic components of circuit board substrate, must develop towards ultra-thin and high-strength. Therefore, higher requirements are also put forward for the various performance indicators of copper foil, such as thickness, strength, hardness, ductility, corrosion resistance, anti-side corrosion performance, etc.

[0003] Traditional pure copper foil is difficult to meet the requirements in some aspects, while copper alloy foil has advantages such as higher strength and corrosion resistance compared to red copper foil. The design and development of copper alloy foil has become one of the current research hotspots. However, due to the higher mechanical properties of copper alloy, more problems need to be solved in the foil preparation process. For example, the higher hardness makes it more difficult to control the plate shape of the material during the rolling process. In addition, the number of rolling passes required in the foil preparation process is greatly increased, which means that the production efficiency is greatly reduced compared to red copper.

[0004] The current method of preparing rolled copper foil is mainly to perform multiple passes of rolling on the copper alloy base material until the size and performance meet the application requirements. The alloy foil prepared in this way has high strength, but the elongation is often less than 3%, and the production efficiency is low, which limits the application of the foil in some aspects. According to relevant reports, during the alloy rolling process, as the number of passes gradually increases, the material's work hardening ability gradually deteriorates, and the multi-pass rolling process will lead to problems such as high difficulty in plate shape control, low elongation, and low preparation efficiency. Summary of the invention

[0005] In view of the problems of high difficulty in controlling plate shape, low elongation and low preparation efficiency in the rolling process of preparing rolled copper foil in the prior art, the present invention provides a rapid processing method for high-performance rolled copper foil, which improves the elongation of the foil, improves the plate shape and improves the production efficiency by regulating the annealing temperature, annealing time and the rolling process after annealing.

[0006] The present invention is achieved through the following technical solutions: A rapid processing method for high-performance rolled copper foil comprises the following steps: cold rolling a copper alloy base material, performing annealing treatment every two passes, wherein the annealing temperature is 200-600°C, the annealing time is 1-5 hours, the single pass processing rate is not higher than 60%, and the processing rates of the remaining single passes except the last pass are not lower than 30%.

[0007] Furthermore, the copper alloy base material is a copper alloy plate with a thickness of 0.1-0.2 mm.

[0008] Furthermore, the cold rolling speed is 400-800 m / min.

[0009] Furthermore, the annealing heating rate is 5-20°C / min.

[0010] Furthermore, the annealing is performed in a protective atmosphere of argon or nitrogen, and after the annealing is completed, the material is further cooled to room temperature in the protective atmosphere.

[0011] Furthermore, the cold-rolled sheet is subjected to surface treatment.

[0012] Furthermore, the surface treatment includes degreasing and drying. Beneficial Effects The method for quickly preparing copper alloy rolled copper foil of the present invention greatly improves the production speed, has a better plate shape and a higher elongation compared to the traditional rolling method, and more importantly, the production efficiency is more than doubled, which greatly improves the production speed and has obvious preparation advantages. DETAILED DESCRIPTION

[0013] The above contents of the present invention are further described in detail below through examples, but this should not be understood as the scope of the above subject matter of the present invention being limited to the following examples, and all technologies implemented based on the above contents of the present invention belong to the scope of the present invention.

[0014] Example 1 Base material: Commercially purchased H62 brass with a thickness of 0.20 mm, the composition of which is Cu-60.6-63.5%, Fe < 0.15%, Pb < 0.08%, P < 0.01%, other unavoidable impurities < 0.5%, and the balance is Zn; (1) The first rolling process: the initial thickness is 0.20 mm, the processing rate is 50%, the outlet thickness is 0.1 mm, and the rolling speed is 400 m / min; (2) The second rolling process: the initial thickness is 0.10 mm, the processing rate is 40%, the outlet thickness is 0.060 mm, and the rolling speed is 350 m / min. After the first two rolling passes, the hardness of the foil increases significantly and the internal stress increases. Annealing treatment is performed at this time. (3) First annealing treatment: annealing temperature is 350°C, heating rate is 10°C / min, annealing time is 4h, annealing is carried out in a high-purity N2 atmosphere. After annealing, continue to cool to room temperature in N2 atmosphere; (4) The third rolling process: initial thickness is 0.060 mm, processing rate is 40%, outlet thickness is 0.036 mm, and rolling speed is 350 m / min; (5) The fourth rolling process: the initial thickness is 0.036 mm, the processing rate is 8%, the outlet thickness is 0.033 mm, the rolling speed is 350 m / min and the rolling speed is 400 m / min; (6) Surface treatment: Degreasing and drying were carried out at a speed of 50 m / min and a temperature of 70°C during the drying process to obtain a 0.033 mm rolled copper foil. The prepared foil had a good shape, small tolerance fluctuation, a hardness of 150 HV, a strength of 470 MPa, and an elongation of 7%.

[0015] Example 2 Base material: Commercially purchased H70 brass with a thickness of 0.15 mm, the composition of which is Cu-69-70%, Fe < 0.15%, Pb < 0.08%, P < 0.01%, other unavoidable impurities < 0.5%, and the balance is Zn; (1) The first rolling process: the initial thickness is 0.150 mm, the processing rate is 50%, the outlet thickness is 0.075 mm, and the rolling speed is 500 m / min; (2) Second rolling process: initial thickness is 0.075 mm, processing rate is 40%, outlet thickness is 0.045 mm, and rolling speed is 550 m / min; (3) First annealing treatment: annealing temperature is 300°C, heating rate is 10°C / min, annealing time is 3h, annealing is carried out in a high-purity N2 atmosphere. After annealing, continue to cool to room temperature in N2 atmosphere; (4) The third rolling process: initial thickness is 0.045 mm, processing rate is 40%, outlet thickness is 0.027 mm, and rolling speed is 350 m / min; (5) The fourth rolling process: the initial thickness is 0.027 mm, the processing rate is 33.3%, the outlet thickness is 0.018 mm, the rolling speed is 350 m / min, and the rolling speed is 800 m / min; (6) Surface treatment: Degreasing and drying were carried out at a speed of 50 m / min and a temperature of 70°C during the drying process to obtain a 0.018 mm rolled copper foil. The prepared foil had a good shape, small tolerance fluctuation, a hardness of 138 HV, a strength of 420 MPa, and an elongation of 9%.

[0016] Example 3 Base material: Commercially purchased H62 brass with a thickness of 0.20 mm, the composition by mass percentage is Cu-98.8, Cr-0.65%, Zr-0.65%, Fe-0.05% and other unavoidable impurities-0.2%; (1) The first rolling process: the initial thickness is 0.200 mm, the processing rate is 40%, the outlet thickness is 0.16 mm, and the rolling speed is 500 m / min; (2) Second rolling process: initial thickness is 0.160 mm, processing rate is 30%, outlet thickness is 0.112 mm, and rolling speed is 500 m / min; (3) First annealing treatment: annealing temperature is 300°C, heating rate is 10°C / min, annealing time is 3h, annealing is carried out in a high-purity N2 atmosphere. After annealing, continue to cool to room temperature in N2 atmosphere; (4) The third rolling process: initial thickness is 0.112 mm, the pressing amount is 40%, the outlet thickness is 0.672 mm, and the rolling speed is 550 m / min; (5) The fourth rolling process: the initial thickness is 0.672 mm, the processing rate is 30%, the outlet thickness is 0.047 mm, and the rolling speed is 550 m / min; (6) Second annealing treatment: annealing temperature is 300°C, heating rate is 10°C / min, annealing time is 3h, annealing is carried out in a high-purity N2 atmosphere. After annealing, continue to cool to room temperature in N2 atmosphere. After annealing, continue to cool to room temperature in N2 atmosphere. (7) Fifth rolling process: initial thickness is 0.047 mm, processing rate is 40%, outlet thickness is 0.028 mm, and rolling speed is 550 m / min; (8) The sixth rolling process: initial thickness is 0.028 mm, processing rate is 35.7%, exit thickness is 0.018 mm, and rolling speed is 350 m / min; (9) Surface treatment: Degreasing and drying were carried out at a speed of 50 m / min and a temperature of 70°C during the drying process to obtain a 0.018 mm rolled copper foil. The prepared foil had a good shape, small tolerance fluctuation, a hardness of 152 HV, a strength of 485 MPa, and an elongation of 7%.

[0017] Comparative Example 1 Base material: the same as that of Example 3; (1) The first rolling process: the initial thickness is 0.200 mm, the processing rate is 40%, the outlet thickness is 0.16 mm, and the rolling speed is 500 m / min; (2) Second rolling process: initial thickness is 0.16 mm, processing rate is 30%, outlet thickness is 0.112 mm, and rolling speed is 550 m / min; (3) The third rolling process: initial thickness is 0.112 mm, processing rate is 30%, outlet thickness is 0.078 mm, and rolling speed is 550 m / min; (4) The fourth rolling process: the initial thickness is 0.078 mm, the processing rate is 20%, the outlet thickness is 0.0627 mm, and the rolling speed is 350 m / min; (5) Fifth rolling process: initial thickness is 0.0627 mm, processing rate is 15%, outlet thickness is 0.053 mm, and rolling speed is 350 m / min; (6) The sixth rolling process: the initial thickness is 0.053 mm, the processing rate is 12%, the outlet thickness is 0.047 mm, and the rolling speed is 350 m / min; (7) The seventh rolling process: the initial thickness is 0.047 mm, the processing rate is 10%, the outlet thickness is 0.042 mm, and the rolling speed is 350 m / min; (8) The eighth rolling process: initial thickness is 0.042 mm, processing rate is 10%, outlet thickness is 0.038 mm, and rolling speed is 350 m / min; (9) Ninth rolling process: initial thickness is 0.038 mm, processing rate is 30%, outlet thickness is 0.034 mm, and rolling speed is 350 m / min; (10) The tenth rolling process: initial thickness is 0.034 mm, processing rate is 10%, outlet thickness is 0.30 mm, and rolling speed is 350 m / min; (11) Eleventh rolling process: initial thickness 0.030 mm, processing rate 10%, exit thickness 0.027 mm, rolling speed 350 m / min; (12) Twelfth rolling process: initial thickness is 0.027 mm, processing rate is 10%, exit thickness is 0.0243, rolling speed is 350 m / min; (13) Thirteenth rolling process: initial thickness is 0.0243 mm, processing rate is 5%, exit thickness is 0.0219, rolling speed is 350 m / min; (14) Fourteenth rolling process: initial thickness is 0.0219 mm, processing rate is 5%, outlet thickness is 0.0197 mm, rolling speed is 350 m / min; (15) The fifteenth rolling process: initial thickness is 0.0197 mm, processing rate is 5%, outlet thickness is 0.0187 mm, and rolling speed is 350 m / min; (16) Sixteenth rolling process: initial thickness is 0.0187 mm, processing rate is 3.7%, exit thickness is 0.018 mm, rolling speed is 350 m / min; (17) Surface treatment: Degreasing and drying were carried out at a speed of 70 m / min and a temperature of 90°C during the drying process to obtain a 0.018 mm rolled copper foil. The prepared foil had a good shape, increased tolerance fluctuation, a hardness of 162 HV, a strength of 515 MPa, and an elongation of 3%.

[0018] Compared with traditional non-annealing rolling, setting a suitable annealing process in the middle of rolling can greatly reduce the number of rolling passes, thereby greatly improving production efficiency. It can be clearly found in the process flow of Example 3 and Comparative Example 1 that continuous rolling requires at least 16 passes to thin the plate to the target thickness of 0.018 mm, and after two annealing processes, only 6 rolling passes are required, which is enough to illustrate the superiority of this annealing and rolling combination method for preparing alloy foil.

[0019] The above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention.

Claims

1. A rapid processing method for high-performance rolled copper foil, characterized in that: The copper alloy base material is cold rolled and annealed every two passes. The annealing temperature is 200-600°C, the annealing time is 1-5 hours, and the single pass processing rate is not higher than 60%. Except for the last pass, the other single pass processing rates are not less than 30%.

2. The rapid processing method of high-performance rolled copper foil according to claim 1, characterized in that: The copper alloy parent material is a copper alloy plate with a thickness of 0.1-0.2 mm.

3. The rapid processing method of high-performance rolled copper foil according to claim 1, characterized in that: The cold rolling speed is 400-800 m / min.

4. The rapid processing method of high-performance rolled copper foil according to claim 1, characterized in that: The annealing heating rate is 5~20℃ / min.

5. The rapid processing method of high-performance rolled copper foil according to claim 1, characterized in that: The annealing is carried out in a protective atmosphere of argon or nitrogen. After the annealing is completed, the material is cooled to room temperature in the protective atmosphere.

6. The rapid processing method of high-performance rolled copper foil according to claim 1, characterized in that: The cold rolled sheet is surface treated.

7. The rapid processing method of high-performance rolled copper foil according to claim 1, characterized in that: The surface treatment includes degreasing and drying.