阅读说明：本技术 一种6μm高强度压延铜箔的轧制方法 (Rolling method of 6-micron high-strength rolled copper foil ) 是由 谢从友 于 2019-10-25 设计创作，主要内容包括：本发明涉及铜箔压延技术领域,特别涉及一种6μm高强度压延铜箔的轧制方法,涉及压延铜箔加工领域,其特征在于,包括以下步骤：1)轧制母材制备：先将铜熔炼铸造成锭,再经热轧开坯、粗轧、预精轧以及退火,得到厚度0.08mm的合金轧制母材,晶粒度≤20μm；2)铜箔轧制：轧制油粘度为5.1～6.2mm/s<Sup>2</Sup>,轧制总共分6个轧制道次进行,最终轧制得到厚度6μm、抗拉强度≥500N/mm<Sup>2</Sup>的高强度压延铜箔。通过以上方法可实现一种6μm压延铜箔的轧制,使其厚度公差≤0.3μm,抗拉强度为500～600MPa,延伸率≥1.0%,表面粗糙度Ra为0.05～0.12μm。(The invention relates to the technical field of copper foil rolling, in particular to a rolling method of a 6 mu m high-strength rolled copper foil, which relates to the field of rolled copper foil processing and is characterized by comprising the following steps: 1) preparing a rolling base material: firstly, smelting and casting copper into ingots, and then carrying out hot rollingCogging, rough rolling, pre-finish rolling and annealing to obtain an alloy rolling base metal with the thickness of 0.08mm, wherein the grain size is less than or equal to 20 mu m; 2) copper foil rolling: the viscosity of the rolling oil is 5.1-6.2 mm/s 2 The rolling is carried out in 6 rolling passes in total, and the final rolling is carried out to obtain the steel with the thickness of 6 mu m and the tensile strength of more than or equal to 500N/mm 2 The high-strength rolled copper foil of (1). The rolling of the rolled copper foil with the thickness of 6 mu m can be realized by the method, the thickness tolerance is less than or equal to 0.3 mu m, the tensile strength is 500-600 MPa, the elongation is more than or equal to 1.0%, and the surface roughness Ra is 0.05-0.12 mu m.)

1. A rolling method of a 6 μm high-strength rolled copper foil is characterized by comprising the following steps:

1) preparing a rolling base material: firstly, smelting and casting copper into ingots, and then carrying out hot rolling cogging, rough rolling, pre-fine rolling and annealing to obtain an alloy rolling base metal of 0.08-0.10 mm;

2) copper foil rolling: the rolling is divided into 6 rolling passes in total;

the pass 1 processing rate is 40-44%, and the entrance unit tension is 4.0-5.0 kg/mm²The outlet unit tension is 7.5-8.5 kg/mm²The rolling force is 36-38 t, the rolling speed is 300-350 m/min, the roll bending force is 6.5-8.5 t, the tilting force is 0.5-1.5 t, and the target plate shape value is-2I;

the pass 2 processing rate is 37-39%, and the entrance unit tension is 7.5-8.5 kg/mm²The outlet unit tension is 9.5-10.5 kg/mm²The rolling force is 34-36 t, the rolling speed is 400-450 m/min, the roll bending force is 6.5-7.5 t, the tilting force is 0.5-1.5 t, and the target plate shape value is-4I;

the pass 3 processing rate is 37-39%, and the entrance unit tension is 10.0-11.0 kg/mm²The outlet unit tension is 12.0-14.0 kg/mm²The rolling force is 33-35 t, the rolling speed is 450-500 m/min, the roll bending force is 6.5-8.5 t, the tilting force is 0.5-1.5 t, and the target plate shape value is-6I;

the 4 th pass working rate is 34-36%, and the entrance unit tension is 13.0-15.0 kg/mm²The outlet unit tension is 16.0-18.0 kg/mm²The rolling force is 33-34 t, the rolling speed is 500-550 m/min, the roll bending force is 6.5-8.5 t, the tilting force is 0.5-1.5 t, and the target plate shape value is-6I;

the 5 th pass working rate is 33-35%, and the entrance unit tension is 15.0-17.0 kg/mm²The outlet unit tension is 18.0-20.0 kg/mm²The rolling force is 32-33 t, the rolling speed is 500-550 m/min, the roll bending force is 6.5-8.5 t, the tilting force is 0.5-1.5 t, and the target plate shape value is-8I;

the 6 th pass working rate is 19-23%, and the entrance unit tension is 18.0-20.0 kg/mm²The outlet unit tension is 20.0-22.0 kg/mm²The rolling force is 32-33 t, the rolling speed is 500-550 m/min, the roll bending force is 6.5-8.5 t, the tilting force is 0.5-1.5 t, and the target plate shape value is-10I.

2. The rolling method of a 6 μm high-strength rolled copper foil according to claim 1, wherein the grain size of the rolled alloy base material produced in step 1) is 20 μm or less.

3. The method for rolling a 6 μm high-strength rolled copper foil according to claim 1, wherein the kinematic viscosity of the rolling oil for rolling in the step 2) is 5.1 to 6.2mm/s²The filtering precision of rolling oil is less than or equal to 1 mu m.

4. The method of rolling a 6 μm high-strength rolled copper foil according to claim 1, wherein the width of the roll surface of the rolling work roll in step 2) is divided into 13 sections, each section corresponding to an individually adjustable rolling oil spray nozzle, each spray nozzle being capable of controlling the temperature and pressure of the rolling oil.

5. The method for rolling a 6 μm high-strength rolled copper foil according to claim 1, wherein the rolling oil used in the rolling step 2) is divided into cold oil and hot oil according to temperature, the cold oil temperature is controlled to 15 to 35 ℃, the hot oil temperature is controlled to 50 to 80 ℃, and the injection pressure is 0 to 8 bar.

6. The rolling method of 6 μm high-strength rolled copper foil according to claim 1, characterized in that the ironing gas is removed at the take-up in step 2) using an ironing roll, the ironing roll pressure: the 1 st to 4 th passes are 130 to 200kpa, and the 5 th to 6 th passes are 60 to 130 kpa.

7. The method for rolling a 6 μm high-strength rolled copper foil according to claim 1, wherein the surface roughness Ra of the work roll for rolling in step 2) is 0.03 μm or less, and the roundness and taper accuracy of the work roll are 0.002mm or less.

8. The method of rolling a 6 μm high-strength rolled copper foil according to claim 1, wherein a circular target plate profile curve having a narrow middle and two loose sides is used in the step 2).

9. The method for rolling a 6 μm high-strength rolled copper foil according to claim 1, wherein a sleeve having a roundness accuracy of 0.05mm or less is selected as the rolling tool in step 2).

Technical Field

The invention relates to the technical field of rolled copper foil, in particular to a rolling method of 6 mu m rolled copper foil.

Background

The rolled copper foil is obtained by firstly smelting and casting copper into ingots, and then carrying out hot rolling cogging, rough rolling, pre-finish rolling, annealing and finished product rolling on the ingots to finally obtain a copper foil product with the target thickness. The rolled copper foil can be used for producing not only pure copper foil but also alloy copper foil so as to meet the use requirements of different industries.

With the rapid development of new generation electronic information technology and new energy automobile industry, higher requirements are put forward on long-term endurance, light weight and rapid charging of lithium ion batteries, and thus the demands on negative electrode materials based on high energy density, high strength and long service life are particularly urgent. The rolled copper foil is a preferred material for manufacturing a new-generation high-energy-density lithium ion battery due to the advantages of compact structure, high strength, low roughness, alloying and the like, but the rolled copper foil for the lithium battery is limited to the rolling difficulty for a long time, the thickness of the rolled copper foil for the lithium ion battery is always maintained at 9-25 mu m, the strength is not high, the product is rough, and the flexibility is poor.

Disclosure of Invention

The invention aims to provide a rolling method of a 6-micron rolled copper foil, which ensures that the tensile strength of the copper foil is more than or equal to 500MPa, the thickness tolerance is less than or equal to 0.3 micron, the plate type is less than or equal to 8I, the surface roughness Ra is as follows: 0.08 to 0.20 μm.

The invention is realized by adopting the following technical scheme, and the rolling method of the 6 mu m high-strength rolled copper foil comprises the following steps:

1) preparing a rolling base material: firstly, smelting and casting copper into ingots, and then carrying out hot rolling cogging, rough rolling, pre-fine rolling and annealing to obtain an alloy rolling base metal of 0.08-0.10 mm;

2) copper foil rolling: the rolling is divided into 6 rolling passes in total;

the pass 1 processing rate is 40-44%, and the entrance unit tension is 4.0-5.0 kg/mm²The outlet unit tension is 7.5-8.5 kg/mm²The rolling force is 36-38 t, the rolling speed is 300-350 m/min, the roll bending force is 6.5-8.5 t, the tilting force is 0.5-1.5 t, and the target plate shape value is-2I;

the pass 2 processing rate is 37-39%, and the entrance unit tension is 7.5-8.5 kg/mm²The outlet unit tension is 9.5-10.5 kg/mm²The rolling force is 34-36 t, the rolling speed is 400-450 m/min, the roll bending force is 6.5-7.5 t, the tilting force is 0.5-1.5 t, and the target plate shape value is-4I;

the 3 rd pass working ratio is37 to 39%, and an inlet unit tension of 10.0 to 11.0kg/mm²The outlet unit tension is 12.0-14.0 kg/mm²The rolling force is 33-35 t, the rolling speed is 450-500 m/min, the roll bending force is 6.5-8.5 t, the tilting force is 0.5-1.5 t, and the target plate shape value is-6I;

the 4 th pass working rate is 34-36%, and the entrance unit tension is 13.0-15.0 kg/mm²The outlet unit tension is 16.0-18.0 kg/mm²The rolling force is 33-34 t, the rolling speed is 500-550 m/min, the roll bending force is 6.5-8.5 t, the tilting force is 0.5-1.5 t, and the target plate shape value is-6I;

the 5 th pass working rate is 33-35%, and the entrance unit tension is 15.0-17.0 kg/mm²The outlet unit tension is 18.0-20.0 kg/mm²The rolling force is 32-33 t, the rolling speed is 500-550 m/min, the roll bending force is 6.5-8.5 t, the tilting force is 0.5-1.5 t, and the target plate shape value is-8I;

the 6 th pass working rate is 19-23%, and the entrance unit tension is 18.0-20.0 kg/mm²The outlet unit tension is 20.0-22.0 kg/mm²The rolling force is 32-33 t, the rolling speed is 500-550 m/min, the roll bending force is 6.5-8.5 t, the tilting force is 0.5-1.5 t, and the target plate shape value is-10I.

Preferably, the crystal grain size of the base metal of the rolled alloy prepared in the step 1) is less than or equal to 20 microns.

Preferably, the kinematic viscosity of the rolling oil for rolling in the step 2) is 5.1-6.2 mm/s²The filtering precision of rolling oil is less than or equal to 1 mu m.

Preferably, the width of the roll surface of the rolling working roll is divided into 13 sections in the step 2), each section corresponds to a rolling oil nozzle which can be independently adjusted, and each nozzle can control the temperature and the pressure of rolling oil.

Preferably, the rolling oil used in the rolling process in the step 2) is divided into cold oil and hot oil according to temperature, the temperature of the cold oil is controlled to be 15-35 ℃, the temperature of the hot oil is controlled to be 50-80 ℃, and the injection pressure is 0-8 bar.

Preferably, ironing and pressing degassing at the rolling position by using an ironing roller in the step 2), wherein the pressure of the ironing roller is as follows: the 1 st to 4 th passes are 130 to 200kpa, and the 5 th to 6 th passes are 60 to 130 kpa.

Preferably, the surface roughness Ra of the working roll for rolling in the step 2) is less than or equal to 0.03 mu m, and the roundness and the taper precision of the working roll are less than or equal to 0.002 mm.

Preferably, the step 2) uses a circular arc target plate-type curve with a tight middle and two loose sides.

Preferably, the sleeve with the roundness precision less than or equal to 0.05mm is selected as a rolling tool in the step 2).

The invention has the beneficial effects that: the rolling of the 6-micron rolled copper foil can be realized by controlling the conditions, so that the thickness tolerance is less than or equal to 0.3 micron, the tensile strength is 500-600 MPa, the elongation is more than or equal to 1.0%, and the surface roughness Ra is 0.05-0.12 micron.

Detailed Description

The following specific embodiments of the present invention are given to further illustrate the technical solution of the present invention, but the embodiments of the present invention are not limited to the following specific embodiments.