Rapid aging treatment method for aluminum alloy monofilament and aluminum alloy monofilament

Abstract

The invention discloses a rapid aging treatment method of an aluminum alloy monofilament and the aluminum alloy monofilament. The method comprises the following steps: preparing an aluminum alloy rod with a required diameter; the prepared aluminum alloy rod is subjected to heat treatment, the elongation of the aluminum alloy rod is increased to the set elongation, and the aluminum alloy rod subjected to heat treatment is obtained; drawing the aluminum alloy rod subjected to heat treatment into an aluminum alloy monofilament; and the aluminum alloy single wire is subjected to aging treatment at the temperature of 90-140 DEG C, heat preservation is conducted for 0.5-1 h, and the target aluminum alloy single wire is obtained. And the aging treatment efficiency of the aluminum alloy monofilament and the performance stability of the aluminum alloy monofilament are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloy monofilament preparation, and in particular to a rapid aging treatment method for aluminum alloy monofilament and the aluminum alloy monofilament. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Aluminum alloy conductors are widely used as conductors for overhead power transmission lines due to their light weight and excellent conductivity. During the manufacturing process, aluminum alloy conductors undergo an aging treatment to improve their strength, hardness, and corrosion resistance.

[0004] Currently, when aluminum alloy wires are aged, the aging temperature used is 150°C-190°C, and the aging holding time is 4-8 hours. This has technical problems such as unstable aging performance and low aging treatment efficiency. Summary of the Invention

[0005] In order to solve the above problems, the present invention proposes a rapid aging treatment method for aluminum alloy monofilaments and aluminum alloy monofilaments, which improves the aging treatment efficiency of the aluminum alloy monofilaments and the performance stability of the aluminum alloy monofilaments.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] Firstly, a rapid aging treatment method for aluminum alloy monofilament is proposed, comprising:

[0008] Prepare an aluminum alloy rod of desired diameter;

[0009] performing heat treatment on the prepared aluminum alloy rod to increase the elongation of the aluminum alloy rod to a set elongation, thereby obtaining a heat-treated aluminum alloy rod;

[0010] Drawing the heat-treated aluminum alloy rod into aluminum alloy monofilament;

[0011] The aluminum alloy single wire is subjected to aging treatment at 90° C. to 140° C. and kept warm for 0.5 to 1 hour to obtain the target aluminum alloy single wire.

[0012] Furthermore, the required diameter is within a diameter error range, which is 9.5 mm ± Δd, where Δd is an allowable error.

[0013] Furthermore, the prepared aluminum alloy rod is heat-treated at 190° C. to 220° C. and kept warm for 1.5 h to 2.5 h to obtain a heat-treated aluminum alloy rod.

[0014] Furthermore, the set elongation of the aluminum alloy rod after heat treatment is greater than 10% and less than or equal to 14%.

[0015] Furthermore, the heat-treated aluminum alloy rod is drawn into an aluminum alloy monofilament, and the drawing speed is controlled to be greater than or equal to 8 m / s and less than or equal to 12 m / s.

[0016] Furthermore, the tensile strength of the drawn aluminum alloy monofilament is greater than 320 MPa and less than or equal to 400 MPa.

[0017] Furthermore, the electrical conductivity of the drawn aluminum alloy monofilament is greater than 52.5% IACS and less than or equal to 54.5% IACS.

[0018] Furthermore, the electrical conductivity of the target aluminum alloy monofilament is greater than 53.5% IACS and less than or equal to 56% IACS.

[0019] Furthermore, the elongation of the target aluminum alloy monofilament is greater than or equal to 6% and less than or equal to 9%.

[0020] In a second aspect, an aluminum alloy monofilament is proposed, which is prepared by using the rapid aging treatment method for an aluminum alloy monofilament proposed in the first aspect.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention provides a rapid aging treatment method for aluminum alloy monofilaments and the aluminum alloy monofilaments. The method first performs a heat treatment on a prepared aluminum alloy rod to preliminarily improve the elongation and tensile strength of the aluminum alloy rod. Thereafter, the heat-treated aluminum alloy rod is drawn to form an aluminum alloy single wire. During the drawing process, the material grains are refined again, so that the tensile strength and electrical conductivity of the aluminum alloy rod are further improved. Finally, the aluminum alloy single wire only needs to be aged at 90° C. to 140° C. and kept warm for 0.5 to 1 hour to slightly improve the tensile strength and electrical conductivity of the aluminum alloy single wire. The tensile strength, elongation and electrical conductivity of the target aluminum alloy monofilament finally obtained can meet quality requirements. The method greatly improves the production efficiency of the aluminum alloy monofilament and reduces energy consumption, and the performance of the prepared target aluminum alloy monofilament is more stable.

[0023] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The present invention is a flow chart of a rapid aging treatment method for aluminum alloy monofilament disclosed in an embodiment. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] In the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0029] Example 1

[0030] In order to improve the aging treatment efficiency of aluminum alloy monofilaments and improve the performance and stability of aluminum alloy monofilaments, a rapid aging treatment method for aluminum alloy monofilaments is disclosed in this embodiment. Figure 1 As shown, including:

[0031] Prepare an aluminum alloy rod of desired diameter;

[0032] performing heat treatment on the prepared aluminum alloy rod to increase the elongation of the aluminum alloy rod to a set elongation, thereby obtaining a heat-treated aluminum alloy rod;

[0033] Drawing the heat-treated aluminum alloy rod into aluminum alloy monofilament;

[0034] The aluminum alloy single wire is subjected to aging treatment at 90° C. to 140° C. and kept warm for 0.5 to 1 hour to obtain the target aluminum alloy single wire.

[0035] The required diameter is within a diameter error range of 9.5 mm ± Δd, where Δd is an allowable error. The allowable error is determined based on actual needs and may be 0.2 mm, 0.3 mm, or 0.5 mm.

[0036] The prepared aluminum alloy rod is heat-treated at 190° C. to 220° C. and kept warm for 1.5 hours to 2.5 hours to obtain the heat-treated aluminum alloy rod.

[0037] The set elongation of the aluminum alloy rod during heat treatment is greater than 10% and less than or equal to 14%.

[0038] The heat-treated aluminum alloy rod is drawn into an aluminum alloy monofilament, and the drawing speed is controlled to be greater than or equal to 8 m / s and less than or equal to 12 m / s.

[0039] The tensile strength of the drawn aluminum alloy monofilament is greater than 320 MPa and less than or equal to 400 MPa.

[0040] The electrical conductivity of the drawn aluminum alloy monofilament is greater than 52.5% IACS and less than or equal to 54.5% IACS.

[0041] The electrical conductivity of the target aluminum alloy monofilament is greater than 53.5% IACS and less than or equal to 56% IACS.

[0042] The elongation of the target aluminum alloy monofilament is greater than or equal to 6% and less than or equal to 9%.

[0043] Taking the preparation of 6201 aluminum alloy single wire as an example, a rapid aging treatment method for aluminum alloy single wire disclosed in the embodiments of this application is described in detail, ensuring that the conductivity, tensile strength, and elongation of the prepared 6201 aluminum alloy single wire are far higher than the national standards. The method includes high-temperature heat treatment of an aluminum alloy rod with a diameter of 9.5 mm, a wire drawing process for the aluminum alloy rod, and high-temperature rapid aging of the aluminum alloy single wire, specifically including:

[0044] S1. Prepare a 6201 aluminum alloy rod with a diameter of 9.5 mm by casting and hot rolling.

[0045] S2. Place a 6201 aluminum alloy rod with a diameter of 9.5 mm into a heat treatment furnace for heat treatment, wherein the heat treatment temperature is 190° C. to 220° C., that is, the heat treatment temperature is greater than or equal to 190° C. and less than or equal to 220° C., and the heat preservation time is 1.5 h to 2.5 h, and the heat preservation time is greater than or equal to 1.5 h and less than or equal to 2.5 h; so that after the heat treatment, the tensile strength of the aluminum alloy rod is increased to 220 MPa to 270 MPa, and the elongation is increased to greater than 10% and less than or equal to 14%, that is, the strength of the aluminum alloy rod after the heat treatment is greater than 220 MPa and less than or equal to 270 MPa, and the elongation is greater than 10% and less than or equal to 14%.

[0046] S3. The heat-treated aluminum alloy rod is drawn into aluminum alloy single wire using a 13-die aluminum drawing machine, with multiple dies used for drawing. The drawing speed is controlled between 8 m / s and 12 m / s, i.e., greater than or equal to 8 m / s and less than or equal to 12 m / s. The drawing die utilizes a nanofilm with a low friction coefficient to reduce the probability of single wire breakage during the drawing process. During the drawing process, the material grains are refined, significantly improving the tensile strength and electrical conductivity of the 6201 aluminum alloy rod, with the tensile strength increased to 320 MPa to 400 MPa and the electrical conductivity increased to 52.5% IACS to 54.5% IACS. In other words, the tensile strength of the drawn aluminum alloy single wire is greater than 320 MPa and less than or equal to 400 MPa, and the electrical conductivity of the drawn aluminum alloy single wire is greater than 52.5% IACS and less than or equal to 54.5% IACS.

[0047] S4. The aluminum alloy monofilaments drawn into coils in S3 are subjected to a high-temperature aging treatment at a temperature of 90°C to 140°C for 0.5 to 1 hour to obtain the final 6201 aluminum alloy monofilaments. High-temperature aging promotes dislocation recovery in the aluminum alloy monofilaments, reduces microdefects, and improves the material's electrical conductivity and elongation. The shorter holding time also prevents grain growth after refinement, ensuring sufficient grain boundaries for electron scattering. This results in a final 6201 aluminum alloy monofilament with an electrical conductivity of 53.5% to 56% IACS and an elongation of 6% to 9%. In other words, the final 6201 aluminum alloy monofilaments have an electrical conductivity greater than 53.5% IACS and less than or equal to 56% IACS, and an elongation greater than or equal to 6% and less than or equal to 9%. This good elongation ensures the safety of the aluminum alloy monofilaments during the stranding process, preventing breakage.

[0048] The present invention discloses a rapid aging method for aluminum alloy monofilaments, combining heat treatment of aluminum alloy rods with aging treatment of aluminum alloy monofilaments. The performance focus is on the increased elongation achieved by this process, while ensuring that the tensile strength and electrical conductivity of the resulting 6201 aluminum alloy monofilaments far exceed national standards. National standards stipulate that the electrical conductivity of LHA1 aluminum alloy monofilaments must be no less than 52.5% IACS, and that aluminum alloy monofilaments with a diameter of 3.5 mm or less must have a tensile strength of 325 MPa or more and an elongation of 3% or more; aluminum alloy monofilaments with a diameter of 3.5 mm or more must have a tensile strength of 315 MPa or more and an elongation of 3% or more; and that LHA2 aluminum alloy monofilaments must have a conductivity of no less than 53% IACS, a tensile strength of 295 MPa or more, and an elongation of 3.5% or more.

[0049] The embodiment of the present application discloses a rapid aging treatment method for aluminum alloy monofilaments. By pre-positioning the heat treatment process on the aluminum alloy rod, the performance of the 6201 aluminum alloy monofilament after aging can be ensured to be more stable, the first-time qualified rate of the product can be improved, and quality loss can be reduced. The aging time is shortened from the original 4-8 hours to 0.5-1 hour, which greatly reduces the energy consumption of the heat treatment, shortens the production waiting time, and improves production efficiency.

[0050] Example 2

[0051] In this embodiment, an aluminum alloy monofilament is disclosed, which is prepared by using the rapid aging treatment method for an aluminum alloy monofilament disclosed in Example 1.

[0052] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.

Claims

1. A rapid aging treatment method for aluminum alloy monofilament, characterized in that: include: Prepare an aluminum alloy rod of desired diameter; performing heat treatment on the prepared aluminum alloy rod to increase the elongation of the aluminum alloy rod to a set elongation, thereby obtaining a heat-treated aluminum alloy rod; Drawing the heat-treated aluminum alloy rod into aluminum alloy monofilament; The aluminum alloy single wire is subjected to aging treatment at 90° C. to 140° C. and kept warm for 0.5 to 1 hour to obtain the target aluminum alloy single wire.

2. The rapid aging treatment method for aluminum alloy monofilament according to claim 1, characterized in that: The required diameter is within a diameter error range, which is 9.5 mm ± Δd, where Δd is the allowable error.

3. The rapid aging treatment method for aluminum alloy monofilament according to claim 1, characterized in that: The prepared aluminum alloy rod is heat-treated at 190° C. to 220° C. and kept warm for 1.5 hours to 2.5 hours to obtain the heat-treated aluminum alloy rod.

4. The rapid aging treatment method for aluminum alloy monofilament according to claim 1, characterized in that: The set elongation of the aluminum alloy rod during heat treatment is greater than 10% and less than or equal to 14%.

5. The rapid aging treatment method for aluminum alloy monofilament according to claim 1, characterized in that: The heat-treated aluminum alloy rod is drawn into an aluminum alloy monofilament, and the drawing speed is controlled to be greater than or equal to 8 m / s and less than or equal to 12 m / s.

6. The rapid aging treatment method for aluminum alloy monofilament according to claim 1, characterized in that: The tensile strength of the drawn aluminum alloy monofilament is greater than 320 MPa and less than or equal to 400 MPa.

7. The rapid aging treatment method for aluminum alloy monofilament according to claim 1, characterized in that: The electrical conductivity of the drawn aluminum alloy monofilament is greater than 52.5% IACS and less than or equal to 54.5% IACS.

8. The rapid aging treatment method for aluminum alloy monofilament according to claim 1, characterized in that: The electrical conductivity of the target aluminum alloy monofilament is greater than 53.5% IACS and less than or equal to 56% IACS.

9. The rapid aging treatment method for aluminum alloy monofilament according to claim 1, characterized in that: The elongation of the target aluminum alloy monofilament is greater than or equal to 6% and less than or equal to 9%.

10. An aluminum alloy monofilament, characterized in that: The aluminum alloy monofilament is prepared by the rapid aging treatment method according to any one of claims 1 to 9.

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