Preparation method of high-elongation aluminum magnesium alloy wire

Abstract

The invention relates to the technical field of metal materials, in particular to a preparation method of a high-elongation aluminum magnesium alloy wire. And pouring aluminum, refining, casting, drawing and doubling. The high-elongation aluminum-magnesium alloy wire is finally manufactured by improving the composition raw materials and the process and coordinating and matching all the steps.

Description

[Technical field]

[0001] The invention relates to the technical field of metal materials, and in particular to a method for preparing a high-elongation aluminum-magnesium alloy wire. [Background technology]

[0002] At present, aluminum-magnesium alloy wire, as a shielding electronic communication material that can replace pure copper round wire, occupies a prominent position in the aluminum alloy gold wire market. It is widely used in the field of information transmission, supporting broadband transmission networks and communication networks in emerging industries, and is used in military industry and aerospace fields.

[0003] Ordinary aluminum-magnesium alloy wires are usually made by mixing aluminum ingots, magnesium ingots, copper and other raw materials, and then undergoing processes such as smelting, degassing and impurity removal, heat treatment, and drawing. At present, the aluminum-magnesium alloy wires obtained by this method are often not ideal in terms of tensile properties and elongation. In addition, the traditional process uses aluminum ingot remelting to prepare aluminum liquid, which is then used in subsequent processes, but this method is more energy-consuming and causes a waste of resources.

[0004] Based on this, the present application proposes a method for preparing a high elongation aluminum-magnesium alloy wire to solve the above problems. [Summary of the invention]

[0005] In view of the above, it is necessary to provide a method for preparing a high elongation aluminum-magnesium alloy wire. The present invention manufactures a high elongation aluminum-magnesium alloy wire through the synergistic effect between various steps.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A method for preparing a high elongation aluminum-magnesium alloy wire, the method comprising the following steps:

[0008] (1) Aluminum pouring: Pour aluminum liquid into the smelting furnace, adjust the natural gas burner to make the aluminum liquid temperature uniform and maintain at 710-730℃, put copper powder, manganese powder, chromium powder and rare earth powder into the furnace and stir;

[0009] (2) Refining: put the refining agent into the refining cage, push it into the smelting furnace, and slowly push it until the refining cage touches the bottom of the smelting furnace. Push it back and forth twice to complete one refining. After the second refining is completed, put the magnesium ingot into a special metal cage, press it under the aluminum liquid surface and move it back and forth to melt the magnesium ingot into the aluminum liquid. After the magnesium pressing is completed, continue refining. Refining is performed 3-5 times per furnace, and the alloy liquid is obtained for standby use after standing for 25-35 minutes.

[0010] (3) Casting: The alloy liquid refined in step (2) is placed in a traction furnace through a launder and is horizontally and continuously tractioned by a traction machine to obtain Aluminum alloy rod;

[0011] (4) Drawing: The aluminum alloy rod is drawn The initial wire is annealed in the middle and then drawn at high speed. The middle wire is pulled by multiple pulls. The intermediate wire is finally drawn into a high-speed micro-drawing machine after continuous annealing combined with rapid water spray cooling. Aluminum-magnesium alloy wire;

[0012] (5) Wire doubling: Extending the original process chain, the aluminum-magnesium alloy wire is subjected to oil immersion and wire doubling processes to make multiple strands of wire doubling wire, that is, high elongation aluminum-magnesium alloy wire is obtained. The multiple strands are specifically 4, 6 or 8 strands.

[0013] Furthermore, the raw materials constituting the alloy liquid are as follows, by weight percentage: 0.08-0.10% magnesium ingot, 0.02-0.04% copper powder, 0.03-0.05% manganese powder, 0.04-0.06% chromium powder and 0.003-0.006% rare earth powder, and the rest is aluminum liquid.

[0014] Furthermore, the rare earth powder is prepared by the following method: anhydrous methanol and rare earth sulfate are mixed, the pH is adjusted to 6.5-7.0 by an acid-base regulator, the temperature is adjusted to 30-45°C, then hectorite is added thereto, stirred for 45-55 minutes, and then centrifuged, the obtained product is washed 2-3 times with deionized water, and then dried to obtain rare earth powder.

[0015] Furthermore, the mass ratio of the rare earth sulfate, anhydrous methanol and hectorite is 1:1-2:0.5-0.8.

[0016] Furthermore, the refining agent in step (2) is a degassing cake, the amount of the degassing cake is 1 cylinder / time, and the degassing cake is obtained by mixing ammonium chloride and hexachloroethane in a mass ratio of 10-20:1.

[0017] Furthermore, the centrifugal separation is carried out at a rotation speed of 1500-1800 r / min.

[0018] The present invention has at least the following beneficial effects:

[0019] 1. The present invention proposes a high elongation aluminum-magnesium alloy wire. During the smelting process, electrolytic aluminum liquid is used for direct preparation, replacing the traditional aluminum ingot remelting operation, which is more energy-saving and environmentally friendly, and improves efficiency. However, the experiment found that the wire prepared by the conventional process after direct preparation of electrolytic aluminum liquid has an unsatisfactory elongation, which limits the use of the wire. This may be caused by the insufficient degree of fusion of each alloy component. Based on this, the present application further improves the composition of the raw materials and the preparation process to obtain an aluminum-magnesium alloy wire with high tensile strength and high elongation.

[0020] 2. The present invention proposes a high elongation aluminum-magnesium alloy wire. First, electrolytic aluminum liquid is used as the main raw material for direct preparation. Then, in order to improve the elongation of the wire obtained after preparation, the applicant further adds rare earth powder. The rare earth powder is prepared by dissolving rare earth sulfate in anhydrous methanol to convert the rare earth metal element from a solid state into an ion dissolved in the solution; then, hectorite is added under a neutral condition of pH 6.5-7.0, and the rare earth powder is finally obtained by fully stirring. It is found in experiments that the addition of the rare earth powder can effectively improve the elongation of the wire. The applicant can This may be because the rare earth powder promotes the subsequent melting of various raw materials in the magnesium-aluminum alloy, reduces the interaction between the various raw materials, and makes the various components of the alloy liquid evenly combined, the product performance is uniform and stable, and the elongation is high; in addition, the applicant also adds a refining agent for refining treatment, and the refining effect is good. The gas content after refining reaches 0.12ml / 100g, thereby further improving the strength and elongation of the finished wire. The various technical means adopted in the present invention cooperate and promote each other, and the overall effect produced is far higher than the simple addition of the effects produced by a single technical means, and has outstanding progress. [Specific implementation method]

[0021] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0022] Any feature disclosed in this specification (including any appended claims and abstract), unless otherwise stated, is merely an example of a series of equivalent or similar features.

[0023] Embodiment 1:

[0024] This embodiment provides a method for preparing a high elongation aluminum-magnesium alloy wire, the method comprising the following steps:

[0025] (1) Aluminum pouring: pouring aluminum liquid into a smelting furnace, adjusting the natural gas burner to make the aluminum liquid temperature uniform and maintained at 710°C, and adding copper powder, manganese powder, chromium powder and rare earth powder into the furnace for stirring; the rare earth powder is prepared by the following method: mixing anhydrous methanol with rare earth sulfate, adjusting the pH to 6.5 with an acid-base regulator, and adjusting the temperature to 30°C, then adding hectorite thereto, stirring for 45 minutes, and then centrifuging at a speed of 1500r / min, washing the obtained product twice with deionized water, and then drying to obtain rare earth powder; the mass ratio of the rare earth sulfate, anhydrous methanol and hectorite is 1:1:0.5;

[0026] (2) Refining: a refining agent is placed in a refining cage, which is pushed into a smelting furnace and slowly pushed until the refining cage contacts the bottom of the smelting furnace. The cage is pushed back and forth twice to complete one refining. After the second refining, the magnesium ingot is placed in a special metal cage, pressed below the surface of the aluminum liquid and moved back and forth to melt the magnesium ingot into the aluminum liquid. After the magnesium pressing is completed, the refining is continued. Each furnace is refined three times, and the alloy liquid is allowed to stand for 25 minutes to be obtained for standby use. The refining agent is a degassing cake, and the amount of the degassing cake is 1 cylinder / time. The degassing cake is obtained by mixing ammonium chloride and hexachloroethane in a mass ratio of 10:1.

[0027] The raw materials constituting the alloy liquid are as follows, by weight percentage: 0.08% magnesium ingot, 0.02% copper powder, 0.03% manganese powder, 0.04% chromium powder and 0.003% rare earth powder, and the rest is aluminum liquid;

[0028] (3) Casting: The alloy liquid refined in step (2) is placed in a traction furnace through a launder and is horizontally and continuously tractioned by a traction machine to obtain Aluminum alloy rod;

[0029] (4) Drawing: The aluminum alloy rod is drawn The initial wire is annealed in the middle and then drawn at high speed. The middle wire is pulled by multiple pulls. The intermediate wire is finally drawn into a high-speed micro-drawing machine after continuous annealing combined with rapid water spray cooling. Aluminum-magnesium alloy wire;

[0030] (5) Wire doubling: Extending the original process chain, the aluminum-magnesium alloy wire is subjected to oil immersion and wire doubling processes to make multiple strands of wire doubling wire, that is, a high elongation aluminum-magnesium alloy wire is obtained. Specifically, the multiple strands are 4 strands.

[0031] Embodiment 2:

[0032] This embodiment provides a method for preparing a high elongation aluminum-magnesium alloy wire, the method comprising the following steps:

[0033] (1) Aluminum pouring: pouring aluminum liquid into a smelting furnace, adjusting the natural gas burner to make the aluminum liquid temperature uniform and maintained at 720°C, and adding copper powder, manganese powder, chromium powder and rare earth powder into the furnace for stirring; the rare earth powder is prepared by the following method: mixing anhydrous methanol with rare earth sulfate, adjusting the pH to 6.7 with an acid-base regulator, and adjusting the temperature to 38°C, then adding hectorite thereto, stirring for 50 minutes, and then centrifuging at a speed of 1700 r / min, washing the obtained product twice with deionized water, and then drying to obtain rare earth powder; the mass ratio of the rare earth sulfate, anhydrous methanol and hectorite is 1:1.5:0.7;

[0034] (2) Refining: a refining agent is placed in a refining cage, which is pushed into a smelting furnace and slowly pushed until the refining cage contacts the bottom of the smelting furnace. The cage is pushed back and forth twice to complete one refining. After the second refining, the magnesium ingot is placed in a special metal cage, pressed below the surface of the aluminum liquid and moved back and forth to melt the magnesium ingot into the aluminum liquid. After the magnesium pressing is completed, the refining is continued. Each furnace is refined 4 times and allowed to stand for 30 minutes to obtain an alloy liquid for standby use. The refining agent is a degassing cake, and the amount of the degassing cake is 1 cylinder / time. The degassing cake is obtained by mixing ammonium chloride and hexachloroethane in a mass ratio of 15:1.

[0035] The raw materials constituting the alloy liquid are as follows, by weight percentage: 0.09% magnesium ingot, 0.03% copper powder, 0.04% manganese powder, 0.05% chromium powder and 0.005% rare earth powder, and the rest is aluminum liquid;

[0036] (3) Casting: The alloy liquid refined in step (2) is placed in a traction furnace through a launder and is horizontally and continuously tractioned by a traction machine to obtain Aluminum alloy rod;

[0037] (4) Drawing: The aluminum alloy rod is drawn The initial wire is annealed in the middle and then drawn at high speed. The middle wire is pulled by multiple pulls. The intermediate wire is finally drawn into a high-speed micro-drawing machine after continuous annealing combined with rapid water spray cooling. Aluminum-magnesium alloy wire;

[0038] (5) Wire doubling: Extending the original process chain, the aluminum-magnesium alloy wire is subjected to oil immersion and wire doubling processes to make multiple strands of wire doubling wire, that is, a high elongation aluminum-magnesium alloy wire is obtained. The multiple strands are specifically 6 strands.

[0039] Embodiment 3:

[0040] This embodiment provides a method for preparing a high elongation aluminum-magnesium alloy wire, the method comprising the following steps:

[0041] (1) Aluminum pouring: pouring aluminum liquid into a smelting furnace, adjusting the natural gas burner to make the aluminum liquid temperature uniform and maintained at 730°C, and adding copper powder, manganese powder, chromium powder and rare earth powder into the furnace for stirring; the rare earth powder is prepared by the following method: mixing anhydrous methanol with rare earth sulfate, adjusting the pH to 7.0 with an acid-base regulator, and adjusting the temperature to 45°C, then adding hectorite thereto, stirring for 55 minutes, and then centrifuging at a speed of 1800 r / min, washing the obtained product with deionized water for 3 times, and then drying to obtain rare earth powder; the mass ratio of the rare earth sulfate, anhydrous methanol and hectorite is 1:2:0.8;

[0042] (2) Refining: a refining agent is placed in a refining cage, which is pushed into a smelting furnace and slowly pushed until the refining cage contacts the bottom of the smelting furnace. The cage is pushed back and forth twice to complete one refining. After the second refining, the magnesium ingot is placed in a special metal cage, pressed below the surface of the aluminum liquid and moved back and forth to melt the magnesium ingot into the aluminum liquid. After the magnesium pressing is completed, the refining is continued. Each furnace is refined 5 times and allowed to stand for 35 minutes to obtain an alloy liquid for standby use. The refining agent is a degassing cake, and the amount of the degassing cake is 1 cylinder / time. The degassing cake is obtained by mixing ammonium chloride and hexachloroethane in a mass ratio of 20:1.

[0043] The raw materials constituting the alloy liquid are as follows, by weight percentage: 0.10% magnesium ingot, 0.04% copper powder, 0.05% manganese powder, 0.06% chromium powder and 0.006% rare earth powder, and the rest is aluminum liquid;

[0044] (3) Casting: The alloy liquid refined in step (2) is placed in a traction furnace through a launder and is horizontally and continuously tractioned by a traction machine to obtain Aluminum alloy rod;

[0045] (4) Drawing: The aluminum alloy rod is drawn The initial wire is annealed in the middle and then drawn at high speed. The middle wire is pulled by multiple pulls. The intermediate wire is finally drawn into a high-speed micro-drawing machine after continuous annealing combined with rapid water spray cooling. Aluminum-magnesium alloy wire;

[0046] (5) Wire doubling: Extending the original process chain, the aluminum-magnesium alloy wire is subjected to oil immersion and wire doubling processes to make multiple strands of wire doubling wire, that is, high elongation aluminum-magnesium alloy wire is obtained. The multiple strands are specifically 8 strands.

[0047] Experimental example:

[0048] In order to illustrate the practical value of this application, the applicant compares the main properties of aluminum-magnesium alloy wires obtained by different preparation methods, and groups them as follows:

[0049] Group 1: aluminum-magnesium alloy wire prepared by the method described in Example 2;

[0050] Group 2: Remove rare earth powder, and other methods are the same as Group 1;

[0051] The third group: removing the hectorite from the rare earth powder, and the other methods were the same as the first group;

[0052] Group 4: The degassing cake is potassium chloride, and other methods are the same as those of Group 1;

[0053] Group 5: The degassing cake is ammonium chloride, and the other methods are the same as those of Group 1;

[0054] Group 6: Replace the ammonium chloride in the degassing cake with potassium chloride, and the other methods are the same as the first group.

[0055] The partial properties of the aluminum-magnesium alloy wires prepared by the above-mentioned methods are compared, and the results are shown in Table 1:

[0056] Table 1 Comparison of main properties of each group of aluminum-magnesium alloy wires

[0057] Elongation(%) tensile strength Group 1 12％ 339 Group 2 9％ 301 Group 3 8％ 310 Group 4 9％ 276 Group 5 5％ 281 Group 6 6％ 269

[0058] According to the results in Table 1, the aluminum-magnesium alloy wire prepared by the method of the present application has the characteristics of high strength and high elongation, and its preparation process is simple, easy to operate, and worthy of promotion. However, after removing or changing the rare earth powder in the second and third groups, the effect of the present application cannot be achieved, indicating that the homemade rare earth powder of the present application has the effect of improving strength and elongation. The fourth to sixth groups indicate that the degassing cake of the present application can improve the refining effect, thereby achieving the improvement of the performance of the aluminum-magnesium alloy wire. In addition, the applicant found in the test process that the gas content reached 0.12ml / 100g after the first group of refining, thereby avoiding wire breakage due to pores during the drawing process and improving the elongation.

[0059] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A method for preparing a high elongation aluminum-magnesium alloy wire, characterized in that: The method comprises the following steps: (1) Aluminum pouring: Pour aluminum liquid into the smelting furnace, adjust the natural gas burner to make the aluminum liquid temperature uniform and maintain at 710-730℃, put copper powder, manganese powder, chromium powder and rare earth powder into the furnace and stir; (2) Refining: put the refining agent into the refining cage, push it into the smelting furnace, and slowly push it until the refining cage touches the bottom of the smelting furnace. Push it back and forth twice to complete one refining. After the second refining is completed, put the magnesium ingot into a special metal cage, press it under the aluminum liquid surface and move it back and forth to melt the magnesium ingot into the aluminum liquid. After the magnesium pressing is completed, continue refining. Refining is performed 3-5 times per furnace, and the alloy liquid is obtained for standby use after standing for 25-35 minutes. (3) Casting: The alloy liquid refined in step (2) is placed in a traction furnace through a launder, and the aluminum alloy rod is obtained by horizontal continuous traction by a traction machine; (4) Drawing: The aluminum alloy rod is drawn into a primary wire, which is then subjected to intermediate annealing and high-speed rough drawing to obtain an intermediate wire. Multiple continuous drawing is performed to obtain an intermediate wire, and finally, after continuous annealing combined with rapid water spray cooling, it enters a high-speed micro-drawing machine and is drawn into a φ0.1-0.18 mm aluminum-magnesium alloy wire; (5) Wire drawing: Extend the original process chain, and make the aluminum-magnesium alloy wire through oil immersion and wire drawing process to make multiple strands of wire drawing wire, that is, obtain high elongation aluminum-magnesium alloy wire.

2. The method according to claim 1, characterized in that: The raw materials constituting the alloy liquid are as follows, by weight percentage: 0.08-0.10% of magnesium ingot, 0.02-0.04% of copper powder, 0.03-0.05% of manganese powder, 0.04-0.06% of chromium powder and 0.003-0.006% of rare earth powder, and the rest is aluminum liquid.

3. The method according to claim 1 or 2, characterized in that: The rare earth powder is prepared by the following method: anhydrous methanol and rare earth sulfate are mixed, the pH is adjusted to 6.5-7.0 by using an acid-base regulator, and the temperature is adjusted to 30-45°C, then hectorite is added thereto, stirred for 45-55 minutes, and then centrifuged, and the obtained product is washed 2-3 times with deionized water, and then dried to obtain rare earth powder.

4. The method according to claim 3, characterized in that The mass ratio of the rare earth sulfate, anhydrous methanol and hectorite is 1:1-2:0.5-0.

8.

5. The method according to claim 1, characterized in that The refining agent in step (2) is a degassing cake, the amount of the degassing cake is 1 cylinder / time, and the degassing cake is obtained by mixing ammonium chloride and hexachloroethane in a mass ratio of 10-20:

1.

6. The method according to claim 3, characterized in that The centrifugal separation is carried out at a rotation speed of 1500-1800 r / min.