Novel tinned copper-clad aluminum alloy wire coating process and preparation method

Abstract

The invention discloses a novel tin-plated copper-clad aluminum alloy wire coating process and a preparation method, and the novel tin-plated copper-clad aluminum alloy wire coating process comprises the following steps: rolling an aluminum alloy material into an aluminum alloy rod through a continuous casting and rolling process in a smelting process; removing an oxide layer on the surface of the aluminum alloy rod; the surface of the aluminum alloy rod with the surface oxide layer removed is coated with a copper strip; drawing and exhausting after coating the copper strip to form a copper-coated aluminum alloy wire blank; the copper-clad aluminum alloy wire blank is subjected to drawing, medium wire drawing, fine wire drawing and annealing treatment to form a copper-clad aluminum alloy wire; and the copper-clad aluminum alloy wire enters a tinning machine and is coated with a tinning layer on the surface to form the tinned copper-clad aluminum alloy wire. The core wire of the tin-plated copper-clad aluminum alloy wire is the copper-clad aluminum alloy wire, the outer layer of the copper-clad aluminum alloy wire is copper, the interior of the copper-clad aluminum alloy wire is made of a high-strength and high-conductivity aluminum alloy material, and the mechanical property and the electrical property of the tin-plated copper-clad aluminum alloy wire are superior to those of a copper-clad aluminum wire, a copper-clad aluminum alloy wire and an aluminum-magnesium wire which are used at present.

Description

Technical Field

[0001] The invention relates to the technical field of electric wires and cables, and in particular to a novel tinned copper clad aluminum alloy wire coating process and a preparation method. Background Art

[0002] Copper is widely used in the world as the most cost-effective conductor material. However, factors such as resource scarcity and high prices have brought many difficulties to the production of material application companies. The research and development of high-performance, low-cost and resource-rich materials that can replace pure copper has become a top priority for material application companies. This can not only alleviate the problem of scarce copper resources in my country, but also greatly reduce the production cost of related products.

[0003] In recent years, copper-clad aluminum alloy wire has been widely used in my country to replace pure copper or aluminum-magnesium alloy as shielding braided wire. Its advantages are: the conductivity is similar to that of pure aluminum, but the strength can reach nearly 180 MPa (20°C soft state), which can meet the requirements of communication cable shielding layer braiding wire and greatly reduce the production cost. At present, the communication cable shielding layer braided wire and grounding wire in 3G and 4G mobile communication base stations are mostly made of this material, but its weakness is: since the modified aluminum alloy rod is very sensitive to trace elements, it is difficult to control during the smelting process, and mechanical properties are often unstable, resulting in frequent wire breakage during drawing and unstable production efficiency. In addition, due to the limitations of strength and conductivity, it still cannot replace pure copper in some application fields that require both electrical and mechanical properties of the wire material (such as new energy vehicles, etc.). Summary of the invention

[0004] The purpose of the present invention is to provide a novel tin-plated copper-clad aluminum alloy wire coating process and preparation method to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a novel tinned copper clad aluminum alloy wire coating process, comprising the following steps:

[0006] S1. During the smelting process, the aluminum alloy material is rolled into an aluminum alloy rod through a continuous casting and rolling process;

[0007] S2, removing the oxide layer on the surface of the aluminum alloy rod;

[0008] S3, coating the copper strip on the surface of the aluminum alloy rod from which the surface oxide layer has been removed;

[0009] S4, after the copper strip is coated, it is drawn and exhausted to form a copper-clad aluminum alloy wire billet;

[0010] S5, forming a copper-clad aluminum alloy wire conductor by subjecting the copper-clad aluminum alloy wire billet to drawing, medium wire drawing, fine wire drawing, and annealing treatment;

[0011] S6. The copper-clad aluminum alloy wire enters the tinning machine and is coated with a tin layer on the surface to form a tinned copper-clad aluminum alloy wire.

[0012] Preferably, the aluminum alloy rod after rolling in step S2 is first drawn to a peeling size and then placed in a peeling device to remove the oxide layer on the surface.

[0013] Preferably, the copper-clad aluminum alloy wire enters a tinning machine, and tin is attached to the surface of the copper layer through annealing and hot-dip plating to form a tinned copper-clad aluminum alloy wire.

[0014] Preferably, after the oxide layer on the surface of the aluminum alloy rod is removed, it needs to be sent into a closed device filled with protective gas.

[0015] Preferably, the protective gas is selected from argon, helium, high-purity nitrogen, carbon dioxide or a mixture thereof.

[0016] Preferably, the copper strip is coated on the surface of the aluminum alloy rod from which the surface oxide layer has been removed, and the copper seam is connected as a whole by welding.

[0017] Preferably, the coated copper strip is welded by a continuous welding process using a argon arc welder.

[0018] Preferably, the trace chemical elements in the aluminum alloy material include: silicon, iron, zinc, copper, magnesium, boron and rare earth elements, and the weight percentage of the chemical composition of the aluminum alloy material is: 0.03%≤silicon≤0.15%, 0.5%≤iron≤1.0%, 0.05%≤zinc≤0.1%, 0.1%≤copper≤0.3%, 0.05%≤magnesium≤0.1%, 0.001%≤boron≤0.04%, 0.2%≤rare earth≤0.5%, and the rest is aluminum.

[0019] A method for preparing a novel tinned copper-clad aluminum alloy wire comprises any one of the novel tinned copper-clad aluminum alloy wire cladding processes described above.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The core wire of the tinned copper clad aluminum alloy wire is a copper clad aluminum alloy conductor. The outer layer of the copper clad aluminum alloy conductor is copper, and the interior is a high-strength and high-conductivity aluminum alloy material. The mechanical and electrical properties are better than the currently used copper clad aluminum wire, copper clad aluminum alloy wire and aluminum-magnesium wire. The cost is relatively low. It can replace pure copper in high-end application fields and meet performance requirements, and can significantly reduce material costs. The processing technology can ensure the quality of the tinned copper clad aluminum alloy wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1 The present invention provides a technical solution: a novel tinned copper clad aluminum alloy wire coating process, comprising the following steps:

[0025] S1. During the smelting process, the aluminum alloy material is rolled into an aluminum alloy rod through a continuous casting and rolling process;

[0026] S2, removing the oxide layer on the surface of the aluminum alloy rod;

[0027] S3, coating the copper strip on the surface of the aluminum alloy rod from which the surface oxide layer has been removed;

[0028] S4, after the copper strip is coated, it is drawn and exhausted to form a copper-clad aluminum alloy wire billet;

[0029] S5, forming a copper-clad aluminum alloy wire conductor by subjecting the copper-clad aluminum alloy wire billet to drawing, medium wire drawing, fine wire drawing, and annealing treatment;

[0030] S6. The copper-clad aluminum alloy wire enters the tinning machine and is coated with a tin layer on the surface to form a tinned copper-clad aluminum alloy wire.

[0031] In the present invention, the aluminum alloy rod after rolling in step S2 is first drawn to a peeling size and then placed in a peeling device to remove the oxide layer on the surface.

[0032] In the present invention, the copper-clad aluminum alloy wire enters a tinning machine, and tin is attached to the surface of the copper layer through annealing and hot-dip treatment to form a tinned copper-clad aluminum alloy wire.

[0033] In the present invention, after the oxide layer on the surface of the aluminum alloy rod is removed, it needs to be sent into a closed device filled with protective gas.

[0034] In the present invention, the protective gas is selected from argon, helium, high-purity nitrogen, carbon dioxide or a mixture thereof.

[0035] In the present invention, the copper strip is coated on the surface of the aluminum alloy rod from which the surface oxide layer has been removed, and the copper seams are connected as a whole by welding.

[0036] In the present invention, the coated copper strip is welded by a continuous welding process using a argon arc welding machine.

[0037] In the present invention, the trace chemical elements in the aluminum alloy material include: silicon, iron, zinc, copper, magnesium, boron and rare earth elements, and the weight percentage of the chemical composition of the aluminum alloy material is: 0.03%≤silicon≤0.15%, 0.5%≤iron≤1.0%, 0.05%≤zinc≤0.1%, 0.1%≤copper≤0.3%, 0.05%≤magnesium≤0.1%, 0.001%≤boron≤0.04%, 0.2%≤rare earth≤0.5%, and the rest is aluminum.

[0038] A method for preparing a novel tinned copper-clad aluminum alloy wire comprises any one of the novel tinned copper-clad aluminum alloy wire cladding processes described above.

[0039] The present invention comprises the following steps: during the smelting process, rolling the aluminum alloy material into an aluminum alloy rod through a continuous casting and rolling process; removing the oxide layer on the surface of the aluminum alloy rod; coating the surface of the aluminum alloy rod with the oxide layer removed with a copper strip; drawing and exhausting the copper strip after coating to form a copper-clad aluminum alloy wire blank; subjecting the copper-clad aluminum alloy wire blank to drawing, medium wire drawing, fine wire drawing and annealing treatment to form a copper-clad aluminum alloy conductor; and the copper-clad aluminum alloy conductor enters a tinning machine to coat the surface with a tinning layer to form a tinned copper-clad aluminum alloy wire.

[0040] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field. Although the embodiments of the present invention have been shown and described, it is understood by ordinary technicians in the field that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. New tinned copper clad aluminum alloy wire coating process, Features: The steps include: S1. During the smelting process, the aluminum alloy material is rolled into an aluminum alloy rod through a continuous casting and rolling process; S2, removing the oxide layer on the surface of the aluminum alloy rod; S3, coating the copper strip on the surface of the aluminum alloy rod from which the surface oxide layer has been removed; S4, after the copper strip is coated, it is drawn and exhausted to form a copper-clad aluminum alloy wire billet; S5, forming a copper-clad aluminum alloy wire conductor by subjecting the copper-clad aluminum alloy wire billet to drawing, medium wire drawing, fine wire drawing, and annealing treatment; S6. The copper-clad aluminum alloy wire enters the tinning machine and is coated with a tin layer on the surface to form a tinned copper-clad aluminum alloy wire.

2. The novel tinned copper clad aluminum alloy wire coating process according to claim 1, Features: In step S2, the rolled aluminum alloy rod is first drawn to a peeling size and then placed in a peeling device to remove the oxide layer on the surface.

3. The novel tinned copper clad aluminum alloy wire coating process according to claim 1, Features: The copper-clad aluminum alloy wire enters a tinning machine, and tin is attached to the surface of the copper layer through annealing and hot-dip treatment to form a tinned copper-clad aluminum alloy wire.

4. The novel tinned copper clad aluminum alloy wire coating process according to claim 1, Features: After the oxide layer on the surface of the aluminum alloy rod is removed, it needs to be sent into a closed device filled with protective gas.

5. The novel tinned copper clad aluminum alloy wire coating process according to claim 4, Features: The protective gas is selected from argon, helium, high-purity nitrogen, carbon dioxide or a mixture thereof.

6. The novel tinned copper clad aluminum alloy wire coating process according to claim 1, Features: The copper strip is coated on the surface of the aluminum alloy rod from which the surface oxide layer has been removed, and the copper seam is connected as a whole by welding.

7. The novel tinned copper clad aluminum alloy wire coating process according to claim 6, Features: The coated copper strip is welded by a continuous welding process using a argon arc welding machine.

8. The novel tinned copper clad aluminum alloy wire coating process according to claim 1, Features: The trace chemical elements in the aluminum alloy material include: silicon, iron, zinc, copper, magnesium, boron and rare earth elements. The weight percentage of the chemical composition of the aluminum alloy material is: 0.03%≤silicon≤0.15%, 0.5%≤iron≤1.0%, 0.05%≤zinc≤0.1%, 0.1%≤copper≤0.3%, 0.05%≤magnesium≤0.1%, 0.001%≤boron≤0.04%, 0.2%≤rare earth≤0.5%, and the rest is aluminum.

9. Preparation method of new tinned copper clad aluminum alloy wire, Features: The invention comprises a novel tin-plated copper-clad aluminum alloy wire coating process as described in any one of claims 1 to 8.

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