CN110306085B - Multi-cavity high-strength 6061 aluminum alloy applicable to automobile doorsill and preparation method thereof - Google Patents
Multi-cavity high-strength 6061 aluminum alloy applicable to automobile doorsill and preparation method thereof Download PDFInfo
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- CN110306085B CN110306085B CN201910668600.8A CN201910668600A CN110306085B CN 110306085 B CN110306085 B CN 110306085B CN 201910668600 A CN201910668600 A CN 201910668600A CN 110306085 B CN110306085 B CN 110306085B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/05—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions
Abstract
The invention provides a multi-cavity high-strength 6061 aluminum alloy applicable to automobile doorsils and a preparation method thereof, wherein raw materials of the 6061 aluminum alloy comprise 0.6-0.8 wt% of Si, 0.1-0.23 wt% of Mn, 0.7-0.9 wt% of Mg, 0.1-0.3 wt% of Cr, 0.2-0.4 wt% of Fe, 0.12-0.25 wt% of Cu, 0.05-0.18 wt% of Ti and the balance of Al. The preparation method of the 6061 aluminum alloy raw material comprises the following steps: step (1): smelting: obtaining an alloy solution; step (2): and (3) filtering: filtering the alloy solution obtained in the step (1) by adopting a double-stage ceramic filter plate to obtain a standby solution; and (3): casting: preparing the liquid to be used after filtering in the step (2) into a casting blank; and (4): homogenizing: obtaining an aluminum alloy ingot; and (5): extrusion molding: obtaining 6061 aluminum alloy section; and (6): and (3) heat treatment: and 6061 aluminum alloy is obtained. The 6061 aluminum alloy obtained by the method has the characteristics of good forming performance, high strength, high hardness and long service life.
Description
Technical Field
The invention relates to the field of metal materials, in particular to a multi-cavity high-strength 6061 aluminum alloy suitable for an automobile threshold and a preparation method thereof.
Background
In order to meet the requirements of light weight of automobiles, meet the requirements of energy conservation, environmental protection, safety and reliability, various light weight materials are developed rapidly. Compared with the steel material for the automobile, the aluminum alloy material has the advantages of small density, high strength, corrosion resistance and the like, can meet the special requirement of the lightweight automobile, and becomes a main material for replacing the steel material in the lightweight automobile technology. However, due to the limitation of the crystal structure, the forming performance of the common aluminum alloy material is poor, and the defects of cracks, cracking, deformation and the like are easily caused in the forming process.
The invention aims to provide a multi-cavity high-strength 6061 aluminum alloy suitable for an automobile threshold and a preparation method thereof. The aluminum alloy section prepared by the invention has the characteristics of good forming performance, high strength, high hardness and long service life.
Disclosure of Invention
The invention aims to provide a multi-cavity high-strength 6061 aluminum alloy suitable for an automobile threshold and a preparation method thereof. The automobile threshold plate is designed and adopted as a structural component of an automobile body in the past, an equal-section structure is usually adopted, a metal plate with the thickness larger than 1.4mm is manufactured through a rolling process to improve the side impact resistance of the threshold plate, however, along with the light weight of the whole automobile, the oil consumption of the whole automobile is reduced, the fuel economy of the automobile is improved, any part capable of reducing weight on the automobile body needs corresponding weight reduction treatment, but the weight reduction does not mean that the strength and the rigidity of a product are reduced, the production cost of the product is not required to be improved, the strength of the threshold plate cannot be reduced while the weight of the threshold plate is reduced when the automobile threshold plate is designed, the production cost of the product is reduced as much as possible in the production process, the economic benefit of the product is improved, and therefore, the currently used threshold plate structure needs to be optimized. The automobile threshold in the prior art is made of metal plates with the thickness of 1mm and the strength of not less than 1180MPa, and the automobile threshold is made of 6-series aluminum materials and is lighter and more portable besides achieving the performance of steel materials.
Specifically, the invention provides the following technical scheme:
the invention provides a multi-cavity high-strength 6061 aluminum alloy suitable for an automobile threshold, which comprises the following components in percentage by weight:
the 6061 aluminum alloy raw material comprises 0.6-0.8 wt% of Si, 0.1-0.23 wt% of Mn, 0.7-0.9 wt% of Mg, 0.1-0.3 wt% of Cr, 0.2-0.4 wt% of Fe, 0.12-0.25 wt% of Cu, 0.05-0.18 wt% of Ti and the balance of Al.
Further preferably, the 6061 aluminum alloy raw material comprises 0.65-0.7 wt% of Si, 0.11-0.16 wt% of Mn, 0.85-0.9 wt% of Mg, 0.15-0.2 wt% of Cr, 0.25-0.3 wt% of Fe, 0.21-0.24 wt% of Cu, 0.08-0.12 wt% of Ti, and the balance of Al.
Further preferably, the 6061 aluminum alloy raw material comprises 0.68 wt% of Si, 0.15 wt% of Mn, 0.89 wt% of Mg, 0.18 wt% of Cr, 0.25 wt% of Fe, 0.23 wt% of Cu and 0.11 wt% of Ti, and the balance of Al.
The invention provides a preparation method of a multi-cavity high-strength 6061 aluminum alloy suitable for an automobile threshold, which comprises the following steps:
(1) smelting: adding an aluminum ingot into a smelting furnace, setting the temperature of the smelting furnace, adding powdery Mn and Cr into the smelting furnace when the temperature of furnace charge rises to a set value and starts to melt, adding a magnesium ingot, an aluminum-titanium alloy, pure copper and an aluminum-silicon intermediate alloy, and uniformly stirring until the materials are completely melted to obtain an alloy solution;
(2) and (3) filtering: filtering the alloy solution obtained in the step (1) by adopting a double-stage ceramic filter plate to obtain a standby solution;
(3) casting: casting the liquid to be used after being filtered in the step (2) into an aluminum bar, then preserving heat for 10-12h at the temperature of 520-550 ℃, and then raising the temperature to 560-580 ℃ and preserving heat for 7h to obtain a casting blank;
(4) homogenizing: placing the casting blank obtained in the step (3) into homogenization treatment equipment, and preserving heat for 6-8 hours at the temperature of 560-580 ℃ for homogenization treatment to obtain an aluminum alloy ingot subjected to homogenization treatment;
(5) extrusion molding: extruding and molding the aluminum alloy ingot obtained in the step (4) in a 50-55MN extruder to obtain a 6061 aluminum alloy section;
(6) and (3) heat treatment: and (3) preserving the 6061 aluminum alloy section obtained in the step (5) at the temperature of 530-560 ℃, carrying out solution treatment, then quenching in water at room temperature for 3-5 minutes, controlling the quenching transfer time not to exceed 8-10 seconds, finally preserving the heat at the temperature of 160-200 ℃ for 6-10 hours, and carrying out aging treatment to obtain the 6061 aluminum alloy.
Further, the method also comprises the step (7): stretching and straightening: and (3) stretching and straightening the 6061 aluminum alloy, wherein the stretching amount is 1-5%.
Furthermore, the mesh number of the filter plates of the double-stage ceramic filter sheet in the step (2) is 30-40 meshes and 50-60 meshes respectively.
Further, in the extrusion forming process in the step (5), the aluminum alloy ingot is heated to 500-520 ℃, and the temperature gradient is 6-8 ℃.
Further, the temperature of an extrusion cylinder in the extrusion forming process in the step (5) is 400-430 ℃, the temperature of an extrusion die is 460-480 ℃, and the extrusion speed is 4-6 m/min.
The invention has the beneficial effects that:
(1) according to the processing method of the 6061 aluminum alloy, the proportion of the components of the 6061 aluminum alloy is adjusted by adding the Mn element and the Cr element, and the growth of crystal grains is inhibited in the heating process, so that the 6061 aluminum alloy has the characteristics of good forming performance, high strength, high hardness and long service life;
(2) the 6061 aluminum alloy provided by the invention is simple in processing method and easy to operate, and can effectively reduce the extrusion cracks of the 6061 aluminum alloy.
Detailed Description
The invention provides a multi-cavity high-strength 6061 aluminum alloy suitable for an automobile threshold, wherein the 6061 aluminum alloy raw material comprises 0.6-0.8 wt% of Si, 0.1-0.23 wt% of Mn, 0.7-0.9 wt% of Mg, 0.1-0.3 wt% of Cr, 0.2-0.4 wt% of Fe, 0.12-0.25 wt% of Cu, 0.05-0.18 wt% of Ti and the balance of Al; preferably, the 6061 aluminum alloy raw material comprises 0.65-0.7 wt% of Si, 0.11-0.16 wt% of Mn, 0.85-0.9 wt% of Mg, 0.15-0.2 wt% of Cr, 0.25-0.3 wt% of Fe, 0.21-0.24 wt% of Cu and 0.08-0.12 wt% of Ti, and the balance of Al; further preferably, the 6061 aluminum alloy raw material comprises 0.68 wt% of Si, 0.15 wt% of Mn, 0.89 wt% of Mg, 0.18 wt% of Cr, 0.25 wt% of Fe, 0.23 wt% of Cu and 0.11 wt% of Ti, and the balance of Al.
The invention also provides a preparation method of the multi-cavity high-strength 6061 aluminum alloy suitable for the automobile threshold, which comprises the following steps:
(1) smelting: adding an aluminum ingot into a smelting furnace, setting the temperature of the smelting furnace, adding powdery Mn and Cr into the smelting furnace when the temperature of furnace charge rises to a set value and starts to melt, adding a magnesium ingot, an aluminum-titanium alloy, pure copper and an aluminum-silicon intermediate alloy, and uniformly stirring until the materials are completely melted to obtain an alloy solution;
(2) and (3) filtering: filtering the alloy solution obtained in the step (1) by adopting a double-stage ceramic filter plate to obtain a standby solution; the mesh number of the filter plates of the two-stage ceramic filter sheet is respectively 30-40 meshes and 50-60 meshes; preferably, the mesh number of the filter plates of the double-stage ceramic filter sheet is 35 meshes and 55 meshes respectively;
(3) casting: casting the liquid to be used after being filtered in the step (2) into an aluminum bar, then preserving heat for 10-12h at the temperature of 520-550 ℃, and then raising the temperature to 560-580 ℃ and preserving heat for 7h to obtain a casting blank; preferably, the temperature is kept for 11h under the condition of 535 ℃, and then the temperature is raised to 570 ℃ and kept for 7 h;
(4) homogenizing: placing the casting blank obtained in the step (3) into homogenization treatment equipment, and preserving heat for 6-8 hours at the temperature of 560-580 ℃ for homogenization treatment to obtain an aluminum alloy ingot subjected to homogenization treatment; preferably, the temperature is kept for 7 hours at 570 ℃;
(5) extrusion molding: extruding and molding the aluminum alloy ingot obtained in the step (4) in a 50-55MN extruder to obtain a 6061 aluminum alloy section; heating the aluminum alloy ingot to 500-520 ℃ in the extrusion forming process, wherein the temperature gradient is 6-8 ℃; the temperature of an extrusion cylinder in the extrusion forming process is 400-430 ℃, the temperature of an extrusion die is 460-480 ℃, and the extrusion speed is 4-6 m/min; preferably, the aluminum alloy ingot is heated to 510 ℃ in the extrusion forming process, and the temperature gradient is 7 ℃; the temperature of an extrusion cylinder in the extrusion forming process is 415 ℃, the temperature of an extrusion die is 470 ℃, and the extrusion speed is 5 m/min;
(6) and (3) heat treatment: preserving the temperature of the 6061 aluminum alloy section obtained in the step (5) at 530-560 ℃, preserving the heat for 3-6 hours, carrying out solid solution treatment, then quenching in water at room temperature for 3-5 minutes, controlling the quenching transfer time not to exceed 8-10 seconds, finally preserving the heat for 6-10 hours at 160-200 ℃, and carrying out aging treatment to obtain the 6061 aluminum alloy; preferably, the temperature is kept at 545 ℃ for 4 hours, the solution treatment is carried out, then the quenching is carried out in water at room temperature for 4 minutes, the quenching transfer time is controlled not to exceed 9 seconds, and finally the temperature is kept at 180 ℃ for 8 hours;
(7) stretching and straightening: stretching and straightening the 6061 aluminum alloy, wherein the stretching amount is 1-5%; preferably, the amount of stretching is 3%.
The present invention will be further described with reference to specific embodiments, but the present invention is not limited to the following embodiments.
Example 1
A preparation method of a multi-cavity high-strength 6061 aluminum alloy suitable for an automobile threshold comprises the following steps:
(1) smelting: adding an aluminum ingot into a smelting furnace, setting the temperature of the smelting furnace, adding powdery Mn and Cr into the smelting furnace when the temperature of furnace charge rises to a set value and starts to melt, adding a magnesium ingot, an aluminum-titanium alloy, pure copper and an aluminum-silicon intermediate alloy, and uniformly stirring until the materials are completely melted to obtain an alloy solution;
(2) and (3) filtering: filtering the alloy solution obtained in the step (1) by adopting a double-stage ceramic filter plate to obtain a standby solution; the mesh number of the filter plates of the two-stage ceramic filter sheet is respectively 30 meshes and 50 meshes;
(3) casting: casting the liquid to be used filtered in the step (2) into an aluminum bar, then preserving heat for 10 hours at the temperature of 520 ℃, and then raising the temperature to 560 ℃ and preserving heat for 7 hours to obtain a casting blank;
(4) homogenizing: placing the casting blank obtained in the step (3) into homogenization treatment equipment, preserving heat for 6 hours at the temperature of 560 ℃, and carrying out homogenization treatment to obtain an aluminum alloy ingot subjected to homogenization treatment;
(5) extrusion molding: extruding and molding the aluminum alloy ingot obtained in the step (4) in a 50MN extruder to obtain a 6061 aluminum alloy section; heating the aluminum alloy ingot to 500 ℃ in the extrusion forming process, wherein the temperature gradient is 6 ℃; the temperature of the extrusion cylinder in the extrusion forming process is 400 ℃, the temperature of the extrusion die is 460 ℃, and the extrusion speed is 4 m/min;
(6) and (3) heat treatment: preserving the temperature of the 6061 aluminum alloy section obtained in the step (5) at 530 ℃ for 3 hours, carrying out solid solution treatment, then quenching in water at room temperature for 3 minutes, controlling the quenching transfer time not to exceed 8 seconds, finally preserving the temperature at 160 ℃ for 6 hours, and carrying out aging treatment to obtain 6061 aluminum alloy;
(7) stretching and straightening: and (3) stretching and straightening the 6061 aluminum alloy, wherein the stretching amount is 2%.
Example 2
A preparation method of a multi-cavity high-strength 6061 aluminum alloy suitable for an automobile threshold comprises the following steps:
(1) smelting: adding an aluminum ingot into a smelting furnace, setting the temperature of the smelting furnace, adding powdery Mn and Cr into the smelting furnace when the temperature of furnace charge rises to a set value and starts to melt, adding a magnesium ingot, an aluminum-titanium alloy, pure copper and an aluminum-silicon intermediate alloy, and uniformly stirring until the materials are completely melted to obtain an alloy solution;
(2) and (3) filtering: filtering the alloy solution obtained in the step (1) by adopting a double-stage ceramic filter plate to obtain a standby solution; the mesh number of the filter plates of the two-stage ceramic filter sheet is 35 meshes and 55 meshes respectively;
(3) casting: casting the liquid to be used filtered in the step (2) into an aluminum bar, then preserving heat for 11 hours at 530 ℃, and then heating to 570 ℃ and preserving heat for 7 hours to obtain a casting blank;
(4) homogenizing: placing the casting blank obtained in the step (3) into homogenization treatment equipment, preserving heat for 7 hours at 570 ℃, and carrying out homogenization treatment to obtain an aluminum alloy ingot subjected to homogenization treatment;
(5) extrusion molding: extruding and molding the aluminum alloy ingot obtained in the step (4) in a 53MN extruder to obtain a 6061 aluminum alloy section; heating the aluminum alloy ingot to 510 ℃ in the extrusion forming process, wherein the temperature gradient is 7 ℃; the temperature of an extrusion cylinder in the extrusion forming process is 415 ℃, the temperature of an extrusion die is 470 ℃, and the extrusion speed is 5 m/min;
(6) and (3) heat treatment: preserving the temperature of the 6061 aluminum alloy section obtained in the step (5) for 4 hours at 545 ℃, carrying out solution treatment, then quenching in water at room temperature for 4 minutes, controlling the quenching transfer time not to exceed 9 seconds, finally preserving the temperature for 8 hours at 180 ℃, and carrying out aging treatment to obtain a 6061 aluminum alloy;
(7) stretching and straightening: and (3) straightening the 6061 aluminum alloy by stretching, wherein the stretching amount is 3%.
Example 3
(1) Smelting: adding an aluminum ingot into a smelting furnace, setting the temperature of the smelting furnace, adding powdery Mn and Cr into the smelting furnace when the temperature of furnace charge rises to a set value and starts to melt, adding a magnesium ingot, an aluminum-titanium alloy, pure copper and an aluminum-silicon intermediate alloy, and uniformly stirring until the materials are completely melted to obtain an alloy solution;
(2) and (3) filtering: filtering the alloy solution obtained in the step (1) by adopting a double-stage ceramic filter plate to obtain a standby solution; the mesh number of the filter plates of the two-stage ceramic filter sheet is 40 meshes and 60 meshes respectively;
(3) casting: casting the liquid to be used filtered in the step (2) into an aluminum bar, then preserving heat for 12 hours at 550 ℃, and then heating to 580 ℃ and preserving heat for 7 hours to obtain a casting blank;
(4) homogenizing: placing the casting blank obtained in the step (3) into homogenization treatment equipment, preserving heat for 8 hours at 580 ℃, and carrying out homogenization treatment to obtain an aluminum alloy ingot subjected to homogenization treatment;
(5) extrusion molding: extruding and molding the aluminum alloy ingot obtained in the step (4) in a 55MN extruder to obtain a 6061 aluminum alloy section; heating the aluminum alloy ingot to 520 ℃ in the extrusion forming process, wherein the temperature gradient is 8 ℃; the temperature of an extrusion cylinder in the extrusion forming process is 430 ℃, the temperature of an extrusion die is 480 ℃, and the extrusion speed is 6 m/min;
(6) and (3) heat treatment: preserving the temperature of the 6061 aluminum alloy section obtained in the step (5) for 6 hours at the temperature of 560 ℃, carrying out solution treatment, then quenching in water at room temperature for 5 minutes, controlling the quenching transfer time not to exceed 10 seconds, finally preserving the temperature for 10 hours at the temperature of 200 ℃, and carrying out aging treatment to obtain a 6061 aluminum alloy;
(7) stretching and straightening: and (3) stretching and straightening the 6061 aluminum alloy, wherein the stretching amount is 5%.
Verification test
Test example 1
Examples 1-3 were repeated to obtain sufficient 6061 aluminum alloy.
The 6061 aluminum alloy of example 3 is taken as an example. The meter weight of the 6061 aluminum alloy is 18kg/m, and the aluminum alloy is produced in a 55MN extruder, and has no extrusion cracks under the condition that the extrusion speed is up to 6 m/min.
Likewise, the 6061 aluminum alloy of example 1-2 was measured at a pressing speed of up to 6m/min, and no press crack was observed. Also, the 6061 aluminum alloy in example 3 can withstand the highest extrusion speed that is greater than that of examples 1-2.
In addition, taking 6061 aluminum alloy as an example in the prior art, the surface generates extrusion cracks under the condition that the extrusion speed is 2.8 m/min. The test results are shown in table 1:
TABLE 1 extrusion control test results
Therefore, the 6061 aluminum alloy processing method provided by the embodiment of the invention has the advantages of good product performance, high strength, high hardness and long service life.
In conclusion, the 6061 aluminum alloy provided by the embodiment of the invention is simple in processing method and easy to operate, can ensure that the 6061 aluminum alloy has better performance, higher strength, higher hardness and longer service life, and is more suitable for being used on an automobile threshold.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (2)
1. A multi-cavity high-strength 6061 aluminum alloy suitable for automobile doorsils is characterized by comprising 0.68 wt% of Si, 0.15 wt% of Mn, 0.89 wt% of Mg, 0.18 wt% of Cr, 0.25 wt% of Fe, 0.23 wt% of Cu and 0.11 wt% of Ti, and the balance of Al;
the preparation method of the high-strength 6061 aluminum alloy comprises the following steps:
(1) smelting: adding an aluminum ingot into a smelting furnace, setting the temperature of the smelting furnace, adding powdery Mn and Cr into the smelting furnace when the temperature of furnace charge rises to a set value and starts to melt, adding a magnesium ingot, an aluminum-titanium alloy, pure copper and an aluminum-silicon intermediate alloy, and uniformly stirring until the materials are completely melted to obtain an alloy solution;
(2) and (3) filtering: filtering the alloy melt obtained in the step (1) by adopting a two-stage ceramic filter plate to obtain a standby liquid; wherein, the mesh number of the filter plates of the double-stage ceramic filter sheet is 30-40 meshes and 50-60 meshes respectively;
(3) casting: casting the liquid to be used after being filtered in the step (2) into an aluminum bar, then preserving heat for 10-12h at the temperature of 520-550 ℃, and then raising the temperature to 560-580 ℃ and preserving heat for 7h to obtain a casting blank;
(4) homogenizing: placing the casting blank obtained in the step (3) into homogenization treatment equipment, and preserving heat for 6-8 hours at the temperature of 560-580 ℃ for homogenization treatment to obtain an aluminum alloy ingot subjected to homogenization treatment;
(5) extrusion molding: extruding and molding the aluminum alloy ingot obtained in the step (4) in a 50-55MN extruder to obtain a 6061 aluminum alloy section; wherein, the aluminum alloy ingot is heated to 500-520 ℃ in the extrusion forming process, and the temperature gradient is 6-8 ℃; the temperature of an extrusion cylinder in the extrusion forming process is 400-430 ℃, the temperature of an extrusion die is 460-480 ℃, and the extrusion speed is 4-6 m/min;
(6) and (3) heat treatment: and (3) preserving the 6061 aluminum alloy section obtained in the step (5) at the temperature of 530-560 ℃, carrying out solution treatment, then quenching in water at room temperature for 3-5 minutes, controlling the quenching transfer time not to exceed 8-10 seconds, finally preserving the heat at the temperature of 160-200 ℃ for 6-10 hours, and carrying out aging treatment to obtain the 6061 aluminum alloy.
2. The method for preparing a multi-cavity high-strength 6061 aluminum alloy suitable for automobile doorsill according to claim 1, further comprising:
(7) stretching and straightening: and (3) stretching and straightening the 6061 aluminum alloy, wherein the stretching amount is 1-5%.
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| CN112646986A (en) * | 2020-09-09 | 2021-04-13 | 广东吉源铝业有限公司 | Production process of 6061T651 aluminum alloy plate |
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| FR2505877A1 (en) * | 1981-05-15 | 1982-11-19 | Cegedur | METHOD FOR IMPROVING THE FORMABILITY OF ALUMINUM-MAGNESIUM-SILICON ALLOYS AND NEW ALUMINUM-MAGNESIUM-SILICON ALLOYS |
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