A high-strength, energy-absorbing aluminum alloy profile and its processing technology and application

Abstract

The present invention relates to the technical field of aluminum alloy processing and preparation, and discloses a high-strength and energy-absorbing aluminum alloy profile, its processing technology and application. By adjusting the content of elements such as Mg, Si, Cu, Fe, Mn, La, and Ce, the extrusion deformation resistance of the aluminum alloy material is reduced, and the extrusion efficiency can be increased by more than 20% compared with the conventional 6082 alloy, while maintaining high material strength and plasticity; by improving the heat treatment process, the production efficiency is improved, and the microstructure of the aluminum alloy material is improved, thereby improving its mechanical properties. Specifically, it includes a material preparation step, a homogenization heat treatment step, an extrusion molding step, a pre-aging treatment step, and a secondary aging treatment step. By optimizing the composition and heat treatment process of the aluminum alloy material, the present invention makes the tensile strength of the produced profile greater than 340MPa, the yield strength greater than 300MPa, the elongation after fracture greater than 10%, and the material bending angle greater than 80°, thereby meeting the requirements of automobile safety.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloy processing and preparation, and in particular to a high-strength and energy-absorbing aluminum alloy profile and a processing technology and application thereof. Background Art

[0002] The automobile rocker beam is a critical safety component, connecting the vehicle's underbody structure to the side structures and bearing loads from the road and lateral forces. Therefore, it must be high-strength, easily absorb energy, and possess excellent formability. Aluminum alloys, due to their lightweight, high-strength, and excellent formability, are an ideal choice for automobile rocker beams. In the prior art, 6082 aluminum alloy is commonly used for automobile rocker beams. 6082 aluminum alloy is a commonly used aluminum alloy with excellent overall performance. During the production process, the aluminum alloy is first cast, then heat treated, and finally extruded into the automobile rocker beam profile. The heat treatment process primarily includes homogenization heat treatment, extrusion-line solution treatment, and artificial aging. A reasonable heat treatment process can improve the microstructure of the aluminum alloy, thereby enhancing its mechanical properties.

[0003] However, existing technologies for producing automotive rocker beam profiles still present several challenges: 1. Existing 6082 aluminum alloy material exhibits high resistance to deformation during extrusion, resulting in low extrusion efficiency and limiting the minimum wall thickness of the produced profile, hindering lightweighting of the rocker beam. 2. Existing 6082 alloy, when used in the production of automotive rocker beam profiles, exhibits low tensile strength and yield strength, resulting in a narrow bending angle, which cannot meet the requirements for lightweighting and also results in high material costs.

[0004] Therefore, the existing technology has problems such as low production efficiency, high material cost and insufficient mechanical properties when producing automobile door sill beam profiles. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-strength, energy-absorbing aluminum alloy profile processing technology with low extrusion resistance and high strength, so as to at least provide a beneficial option or create conditions for solving one or more technical problems existing in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solutions.

[0007] A high-strength and energy-absorbing aluminum alloy profile processing process, the steps of which are as follows.

[0008] 1) Optimize the composition of aluminum alloy materials: by adjusting the content of elements such as Mg, Si, Cu, Fe, Mn, La, and Ce, the Mg content is 0.7%-1.0%, the Si content is 0.7%-1.0%, and the Cu content is 0.05%-0.35%; the Mg / Si ratio is controlled in the range of 0.8-1.3 to avoid excessive Si causing a large number of elemental silicon particles, thereby affecting the plasticity of the profile, resulting in a reduction in the bending angle and fragmentation under column pressure; the sum of the Mg, Si, and Cu contents Mg+Si+Cu is controlled in the range of 1.6%-1.9% to ensure sufficient strengthening phase elements, avoid the decrease in strength caused by too little strengthening phase, and avoid the increase in material quenching sensitivity caused by too many strengthening phase elements and the decrease in material plasticity; Fe content 0.05%-0.25%, Mn content 0.1%-0.3%; the difference between Si and Fe content, Si-Fe, is controlled within 0.6%-0.8%, ensuring sufficient Si element to participate in strengthening and avoiding the strength loss caused by too little effective Si element content; Mn / Fe range is 0.8-1.4, ensuring sufficient Mn element to promote the transformation of Fe phase to α phase and avoid the adverse effect of β-Fe phase on plasticity; La content is 0.05%-0.15%, Ce content is 0.05%-0.15%; the sum of Mn, La, and Ce content Mn+La+Ce is controlled within 0.20%-0.40%, ensuring sufficient refinement of the material grain structure while avoiding excessive element content that affects the material's quenching sensitivity. The above element ratio makes the aluminum alloy material have low extrusion deformation resistance and can increase extrusion efficiency by more than 20% compared to conventional 6082 alloy, while maintaining high material strength and plasticity. The above contents are all weight percentages.

[0009] 2) Improved heat treatment process: By improving the heat treatment process, production efficiency is improved, and the microstructure of the aluminum alloy material and its mechanical properties are improved. Specifically, the aluminum rod is first subjected to homogenization heat treatment at a temperature of 540°C-560°C and a homogenization holding time of 8h-12h. After homogenization, it is rapidly cooled at a cooling rate of 300°C / h. Then, different extruded rod gentle discharge rates are selected according to different types of profiles, and water cooling or water spray cooling is performed. Finally, pre-aging and secondary aging are carried out. The pre-aging temperature is 100°C-120°C, the pre-aging holding time is 1h-2h, and the secondary aging temperature is 160°C-180°C, and the aging time is 4h-10h.

[0010] In some implementations, the aluminum alloy profile in the shape of a category letter is extruded, the extrusion rod temperature is 480-500°C, the profile discharge speed is 7-12m / min, and the discharge port temperature is 540-550°C.

[0011] In some embodiments, a multi-grid integrated aluminum alloy profile is obtained by extrusion, the extrusion rod temperature is 480-500°C, the profile discharge speed is 6-8m / min, and the discharge port temperature is 540-550°C.

[0012] By optimizing the composition and heat treatment process of the aluminum alloy material, the present invention ensures that the tensile strength of the produced profile is greater than 340MPa, the yield strength is greater than 300MPa, the elongation after fracture is greater than 10%, and the bending angle of the material is greater than 80°, thus meeting the requirements of automobile safety.

[0013] By optimizing the composition and heat treatment process of the aluminum alloy material, the present invention enables the thinnest wall thickness of the produced profile to be as low as 1.5 mm, helping to achieve lightweighting of the threshold beam and significantly reducing material and extrusion production costs.

[0014] On the other hand, the present invention further provides a high-strength and energy-absorbing aluminum alloy profile, which is manufactured using the high-strength and energy-absorbing aluminum alloy profile processing technology described above.

[0015] On the other hand, the present invention also provides the use of the high-strength and energy-absorbing aluminum alloy profile described above in the production of automobile door sill beams.

[0016] Compared with the prior art, the present invention mainly solves the following technical problems.

[0017] 1) The problem of existing 6082 aluminum alloy materials having large resistance to extrusion deformation, resulting in low extrusion efficiency, is solved. By optimizing the composition and heat treatment process of the aluminum alloy material, the material's resistance to extrusion deformation is reduced, and the extrusion efficiency can be increased by more than 20% compared with conventional 6082 alloy.

[0018] 2) The problem that the existing technology for producing automobile door sill beam profiles has low tensile strength and yield strength, and the material bending angle is small, which cannot meet the safety requirements under the conditions of automobile lightweighting and weight reduction. By optimizing the composition of aluminum alloy materials and the heat treatment process, the tensile strength of the produced profiles is greater than 340MPa, the yield strength is greater than 300MPa, the elongation after fracture is greater than 10%, and the material bending angle is greater than 80°, which meets the automobile safety requirements.

[0019] 3) This technology solves the high material cost problem in the production of automobile rocker beam profiles using existing technologies. By optimizing the composition of aluminum alloy materials and the heat treatment process, the thinnest wall thickness of the produced profile can be reduced to 1.5mm, helping to achieve lightweighting of the rocker beam and significantly reducing material and extrusion production costs.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects.

[0021] First, the aluminum alloy material of the present invention features precisely controlled contents of Mg, Si, Cu, Fe, Mn, La, and Ce, resulting in high strength, good energy absorption, and excellent formability, meeting the safety requirements of automotive sill beams. Furthermore, the Mn / Fe ratio is within a specific range, further optimizing the material's microstructure and improving its mechanical properties.

[0022] Second, the precisely controlled homogenization heat treatment temperature and time, along with the rapid cooling rate, optimize the aluminum alloy's microstructure, thereby improving its mechanical properties. Furthermore, the precisely controlled pre-aging and secondary aging temperatures and times further enhance the aluminum alloy's mechanical properties.

[0023] 3. The extrusion process of the present invention is precisely controlled, so that the aluminum alloy material has less resistance during extrusion deformation, thereby improving the extrusion efficiency. The thinnest wall thickness of the produced profile can reach 1.5mm, which is conducive to lightweighting the threshold beam and greatly reduces the material and extrusion production costs.

[0024] Fourth, the tensile strength, yield strength, elongation after fracture, and bending angle of the profiles produced by the present invention are significantly improved, thus meeting automotive safety requirements. Overall, the aluminum alloy material and its heat treatment process of the present invention not only enhance the mechanical properties of automotive sill beams, but also increase production efficiency and reduce material costs, thus possessing broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Shown is a column pressure test diagram of the aluminum alloy profile for automobile door sill beam prepared in Example 1 of the present invention.

[0026] Figure 2 Shown is a column pressure test diagram of the aluminum alloy profile for automobile door sill beam prepared in Comparative Example 1 of the present invention. DETAILED DESCRIPTION

[0027] The following further describes the specific embodiments of the present invention to make the technical solutions and beneficial effects of the present invention clearer and more specific. The following embodiments are exemplary and intended to explain the present invention, but are not to be construed as limiting the present invention.

[0028] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. Example

[0029] A process for processing aluminum alloy profiles for automobile door sill beams comprises the following steps.

[0030] Step 1: Material Preparation. First, prepare an aluminum rod with a diameter of 228 mm. Its composition, by weight, is as follows: Mg content 0.74%, Si content 0.80%, Cu content 0.15%, Mg / Si ratio controlled at 0.95, Mg+Si+Cu content 1.69%, Fe content 0.15%, Mn content 0.18%, Si-Fe content 0.65%, Mn / Fe ratio 1.2, La content 0.08%, Ce content 0.10%, Mn+La+Ce content 0.36%, and the remainder is Al.

[0031] Step 2: Homogenization Heat Treatment. Place the aluminum bar in a homogenization furnace for homogenization heat treatment. The homogenization heat treatment temperature is 550°C and the homogenization holding time is 10 hours. After homogenization, rapidly cool the bar at a cooling rate of 300°C / hour.

[0032] Step 3: Extrusion. Depending on the type of profile, select different extrusion rod temperatures and discharge speeds. In this example, the extrusion process is for a sill beam profile in the shape of a letter "G" (likely a type of interior door sill). The extrusion rod temperature is 480°C, the profile discharge speed is 10 m / min, the discharge port temperature is 550°C, and water cooling is used.

[0033] Step 4: Pre-aging treatment: Pre-age the extruded profile at 100°C for 1 hour.

[0034] Step 5: Secondary aging treatment: The pre-aged profile is subjected to secondary aging treatment at 180°C for 6 hours.

[0035] The aluminum alloy profile for automobile door sill beam prepared in this embodiment was subjected to column pressure test, and the results are as follows: Figure 1 As shown. Figure 1 It can be seen that the aluminum alloy profile for automobile sill beams produced in this embodiment passes the column pressure test and meets the high-strength and energy-absorbing requirements of the aluminum alloy profile for automobile sill beams. Example

[0036] A process for processing aluminum alloy profiles for automobile door sill beams comprises the following steps.

[0037] Step 1: Material Preparation. First, prepare an aluminum rod with a diameter of 228 mm. Its composition, by weight percentage, is as follows: Mg content 0.89%, Si content 0.80%, Cu content 0.17%, Mg / Si ratio controlled at 1.11, Mg+Si+Cu content 1.86, Fe content 0.19%, Mn content 0.20%, Si-Fe content 0.61%, Mn / Fe ratio 1.05, La content 0.08%, Ce content 0.10%, Mn+La+Ce content 0.38%, and the remainder is Al.

[0038] Step 2: Homogenization Heat Treatment. Place the aluminum bar in a homogenization furnace for homogenization heat treatment. The homogenization heat treatment temperature is 560°C and the homogenization holding time is 10 hours. After homogenization, rapidly cool the bar at a cooling rate of 300°C / hour.

[0039] Step 3: Extrusion molding: Extrusion of the sill beam profile in the shape of a font, with an extrusion rod temperature of 500°C, a profile discharge speed of 10m / min, a discharge port temperature of 550°C, and water cooling.

[0040] Step 4: Pre-aging treatment: The extruded profile is pre-aged at 100°C for 1.5 hours.

[0041] Step 5: Secondary aging treatment: The pre-aged profile is subjected to secondary aging treatment at 170°C for 6 hours. Example

[0042] A process for processing aluminum alloy profiles for automobile door sill beams comprises the following steps.

[0043] Step 1: Material Preparation. First, prepare an aluminum rod with a diameter of 381 mm. Its composition, by weight percentage, is as follows: Mg content 0.93%, Si content 0.82%, Cu content 0.10%, Mg / Si ratio controlled at 1.1, Mg+Si+Cu content 1.85%, Fe content 0.12%, Mn content 0.12%, Si-Fe content 0.70%, Mn / Fe ratio 1.0, La content 0.07%, Ce content 0.08%, Mn+La+Ce content 0.27%, and the remainder is Al.

[0044] Step 2: Homogenization Heat Treatment. Place the aluminum bar in a homogenization furnace for homogenization heat treatment. The homogenization heat treatment temperature is 560°C and the homogenization holding time is 10 hours. After homogenization, rapidly cool the bar at a cooling rate of 300°C / hour.

[0045] Step 3: Extrusion. Depending on the type of profile, select different extrusion rod temperatures and discharge speeds. In this example, a multi-grid, integrated sill beam profile was extruded with an extrusion rod temperature of 500°C, a profile discharge speed of 6 m / min, a discharge port temperature of 545°C, and water spray cooling.

[0046] Step 4: Pre-aging treatment: The extruded profile is pre-aged at 110°C for 1.5 hours.

[0047] Step 5: Secondary aging treatment: The pre-aged profile is subjected to secondary aging treatment at 165°C for 10 hours. Example

[0048] A process for processing aluminum alloy profiles for automobile door sill beams comprises the following steps.

[0049] Step 1: Material Preparation. First, prepare an aluminum rod with a diameter of 381 mm. Its composition, by weight, is as follows: Mg content 0.72%, Si content 0.73%, Cu content 0.30%, Mg / Si ratio controlled to 0.99, Mg+Si+Cu content 1.65%, Fe content 0.12%, Mn content 0.12%, Si-Fe content 0.61%, Mn / Fe ratio 1, La content 0.06%, Ce content 0.07%, Mn+La+Ce content 0.25%, and the remainder is Al.

[0050] Step 2: Homogenization Heat Treatment. Place the aluminum bar in a homogenization furnace for homogenization heat treatment. The homogenization heat treatment temperature is 550°C and the homogenization holding time is 12 hours. After homogenization, rapidly cool the bar at a cooling rate of 300°C / h.

[0051] Step 3: Extrusion. Depending on the type of profile, the extrusion rod temperature and discharge speed are selected. In this example, a multi-grid, integrated sill beam profile is extruded with a rod temperature of 490°C, a profile discharge speed of 8 m / min, a discharge port temperature of 545°C, and water spray cooling.

[0052] Step 4: Pre-aging treatment: Pre-age the extruded profile at 110°C for 2 hours.

[0053] Step 5: Secondary aging treatment: The pre-aged profile is subjected to secondary aging treatment at 170°C for 8 hours.

[0054] Comparative Example 1.

[0055] A processing technology for aluminum alloy profiles for automobile door sill beams is basically the same as that of Example 1, except that:

[0056] 1) Step 1: In the material preparation step, the aluminum rod composition is as follows by weight percentage: Mg content 0.65%, Si content 0.86%, Cu content 0.32%, Mg / Si ratio controlled to 0.76, Mg+Si+Cu content 1.83%, Fe content 0.2%, Mn content 0.22%, Si-Fe content 0.64%, Mn / Fe ratio 1.1, La content 0.06%, Ce content 0.08%, Mn+La+Ce content 0.36%, and the rest is Al.

[0057] 2) During the extrusion molding step, the profile discharge speed is 12m / min.

[0058] The aluminum alloy profiles for automobile door sill beams prepared in this comparative example were subjected to column pressure tests, and the results were as follows: Figure 2 As shown. Figure 2It can be seen that the aluminum alloy profile for automobile sill beams prepared in this comparative example fails the column pressure test and cannot meet the high-strength and energy-absorbing requirements of the aluminum alloy profile for automobile sill beams.

[0059] In order to better reflect the progress of the present invention, the present invention also conducted comparative tests of Comparative Examples 2 to 6. The process parameters of Comparative Examples 2 to 6 are shown in Tables 1 and 2.

[0060] Table 1. Aluminum alloy material composition of Examples 1-4 and Comparative Examples 1-6

[0061] .

[0062] Table 2. Comparison of heat treatment processes for Examples 1-4 and Comparative Examples 1-6

[0063] .

[0064] It should be noted that Table 1 and Table 2 are used to illustrate the differences between different embodiments and different comparative examples, and the parts not shown in Table 1 and Table 2 are the same.

[0065] Performance testing.

[0066] The performance tests were conducted on the aluminum alloy profiles for automobile door sill beams prepared in Examples 1-4 and Comparative Examples 1-6. The results are shown in Table 3.

[0067] Table 3. Performance test comparison table of Examples 1-4 and Comparative Examples 1-6

[0068] .

[0069] As can be seen from Table 3, when one or more of the aluminum alloy material composition or heat treatment process changes, one or more of the strength and energy absorption performance of the resulting aluminum alloy profile deteriorates. This shows that the technical effects of the present invention are the result of the combined effects of optimizing the aluminum alloy material composition and the heat treatment process.

[0070] Furthermore, due to the advanced nature of the present invention, it has broad applications in fields such as automotive engineering, materials science, and heat treatment processes. In the automotive engineering field, the high-strength, energy-absorbing aluminum alloy material for automotive sill beams and its heat treatment process can effectively address existing issues in the production of automotive sill beam profiles. First, the aluminum alloy material of the present invention exhibits low resistance to deformation during extrusion, which improves extrusion efficiency and reduces material costs. It also achieves lightweighting of the sill beam, meeting the demand for lightweighting in automobiles. Second, when producing profiles, the aluminum alloy material of the present invention exhibits high tensile strength and yield strength, high elongation after fracture, and a large bending angle, meeting automotive safety requirements. Therefore, the present invention has broad application prospects in the automotive engineering field. In the materials science field, the aluminum alloy material of the present invention and its heat treatment process can serve as a new type of high-strength, energy-absorbing aluminum alloy material for various materials requiring high strength, high energy absorption, and good formability. Due to its unique alloy composition and heat treatment process, the aluminum alloy material of the present invention possesses excellent mechanical properties and formability, meeting the needs of a variety of applications. Therefore, the present invention has broad application prospects in the materials science field. In the field of heat treatment processes, the heat treatment process of the present invention can be used as a new, efficient, and energy-saving heat treatment process for aluminum alloy materials, and can be applied to various aluminum alloy materials that require high strength, good energy absorption, and good formability. Due to its simple and efficient heat treatment process, the heat treatment process of the present invention can improve production efficiency, while also preventing internal defects in aluminum alloy materials and improving their mechanical properties. Therefore, the present invention has broad application prospects in the field of heat treatment processes.

[0071] In general, the high-strength and energy-absorbing aluminum alloy material for automobile door sill beams and its heat treatment process of the present invention have excellent mechanical properties and forming properties due to their unique alloy composition and heat treatment process, can meet the needs of the automotive, material and heat treatment fields, and have broad application prospects and market demand.

[0072] It should be noted that the various technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art could make numerous modifications and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention. Any portions not described in the specific embodiments represent prior art or common knowledge.

[0074] It should also be noted that, in the description of the present invention, the content of the present invention can be more easily understood by referring to the above detailed description of the preferred embodiment of the present invention and the included embodiments. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In the event of a conflict, the definitions in this specification shall prevail.

[0075] As used herein, the term "prepared from" is used synonymously with "comprising." As used herein, the terms "comprising," "including," "having," "containing," or any other variations thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0076] In the present invention, when amount, concentration or other value or parameter is expressed as a range, preferred range or a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including a range of "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5" etc. When a numerical range is described in the present invention, unless otherwise stated, the range is intended to include its end value and all integers and fractions within the range.

[0077] In addition, the indefinite articles "a" and "an" before the elements or components of the present invention do not limit the quantity requirement (i.e., the number of times the elements or components appear). Therefore, "a" or "an" should be interpreted as including one or at least one, and elements or components in the singular also include plural forms, unless the number is obviously intended to be singular.

Claims

1. A high-strength and energy-absorbing aluminum alloy profile processing technology, characterized in that: Here are the steps: 1) Material preparation: prepare aluminum bars. The composition of the aluminum bars is as follows by weight percentage: Mg 0.7-1.0%, Si 0.7-1.0%, Cu 0.05-0.35%, Mg / Si ratio is controlled to be 0.8-1.3, the sum of Mg, Si, and Cu contents is controlled to be 1.6-1.9%, Fe content is 0.05-0.25%, Mn content is 0.1-0.3%, the difference between Si and Fe contents is controlled to be 0.6-0.8%, Mn / Fe ratio is 0.8-1.4, La content is 0.05-0.15%, Ce content is 0.05-0.15%, the sum of Mn, La, and Ce contents is controlled to be 0.2-0.4%, and the rest is Al; 2) Homogenization heat treatment: Place the aluminum rod in a homogenization furnace for homogenization heat treatment; the homogenization heat treatment temperature is 540-560℃, and the homogenization holding time is 8-12h; after homogenization treatment, cool rapidly at a cooling rate of more than 300℃ / h; 3) Extrusion molding: extruding the aluminum rod after homogenization heat treatment to obtain aluminum alloy profiles; 4) Pre-aging treatment: pre-aging the extruded aluminum alloy profile at a temperature of 100-120°C for 1-2 hours; 5) Secondary aging treatment: the pre-aged profile is subjected to secondary aging treatment at a temperature of 160-180°C for 4-10 hours to obtain a high-strength and energy-absorbing aluminum alloy profile.

2. The high-strength and energy-absorbing aluminum alloy profile processing technology according to claim 1 is characterized in that: In the extrusion molding step, different extruded rod gentle discharge speeds are set according to different types of aluminum alloy profiles obtained by extrusion.

3. The high-strength and energy-absorbing aluminum alloy profile processing technology according to claim 1 is characterized in that: In the extrusion molding step, a category-shaped aluminum alloy profile is extruded, the extrusion rod temperature is 480-500°C, the profile discharge speed is 7-12m / min, and the discharge port temperature is 540-550°C.

4. The high-strength and energy-absorbing aluminum alloy profile processing technology according to claim 1 is characterized in that: In the extrusion molding step, a multi-grid integrated aluminum alloy profile is extruded, the extrusion rod temperature is 480-500°C, the profile discharge speed is 6-8m / min, and the discharge port temperature is 540-550°C.

5. A high-strength and energy-absorbing aluminum alloy profile processing process according to claim 3 or 4, characterized in that: Aluminum alloy profiles are water-cooled after extrusion.

6. A high-strength and energy-absorbing aluminum alloy profile, characterized in that: The high-strength and energy-absorbing aluminum alloy profile is produced by using the processing technology of any one of claims 1 to 5.

7. The high-strength and energy-absorbing aluminum alloy profile according to claim 6, characterized in that: The thinnest wall thickness of high-strength and energy-absorbing aluminum alloy profiles is 1.5mm.

8. Use of the high-strength and energy-absorbing aluminum alloy profile according to any one of claims 6 to 7 in the production of automobile door sill beams.

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