Aluminum alloy bracket with flattened ends and its processing technology and application

Abstract

The present invention relates to the technical field of aluminum alloy processing and preparation, and discloses an aluminum alloy bracket with flattened ends, a processing technology, and an application thereof. The processing technology comprises: 1) designing alloy composition, 2) smelting and casting, 3) homogenizing and heat preservation, 4) extrusion molding, 5) end stamping and flattening processing, and 6) aging treatment. The designed alloy composition is Mg 0.7-1.0wt%, Si 0.7-1.0wt%, with the Mg / Si ratio controlled within 1.0-1.3; Fe 0.1-0.3wt%, with the Si-Fe content difference controlled within a range of 0.5-0.7wt%; Cu 0.1-0.3wt%, Mn 0.4-0.6wt%, Cr 0.05-0.20wt%, La 0.05-0.2wt%, with the content and control range of Mn+Cr+La being 0.6-0.8wt%; Sn 0.05-0.20wt%, and the balance being Al. The aluminum alloy bracket processing technology of the present invention not only improves the performance and quality of the product, but also increases production efficiency and reduces production costs by optimizing alloy composition, improving smelting casting and extrusion molding processes, and simplifying heat treatment processes, and has significant advantages.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloy processing and preparation, and in particular to a low-cost, high-strength, two-end-flattened aluminum alloy bracket, and a processing technology and application thereof. Background Art

[0002] Aluminum alloys are widely used in the automotive industry due to their light weight, high strength, and excellent corrosion resistance, particularly in the manufacture of automotive structural parts and engine components. Extrusion molding is a key method in the processing of aluminum alloys, where aluminum alloy raw materials are pressed through a mold into a desired profile. However, due to their unique physical and chemical properties, aluminum alloys are prone to cracking and deformation during subsequent processing after extrusion molding. Therefore, the subsequent processing of aluminum alloys has become an important research area.

[0003] Existing automotive aluminum alloy brackets typically utilize a process that involves extruding the profile, annealing the profile, flattening the profile ends, and then performing offline solution treatment and aging. This process involves extruding the aluminum alloy into a profile. The profile is then annealed to eliminate internal stress, reduce material strength, and improve its plasticity and toughness. The annealed profile is then flattened at both ends to achieve the desired component shape. Finally, the finished component undergoes offline solution treatment and aging to improve its mechanical properties.

[0004] However, the existing automotive aluminum alloy bracket processing process has the following problems: 1) The profile needs to undergo high-temperature heating and slow cooling during the annealing process, which is not only time-consuming and energy-consuming, but also easily causes the profile size to change, affecting the accuracy of the final component. 2) During the flattening process at both ends, the solid solution process may cause the internal grain size of the aluminum alloy to increase, thereby causing the plasticity and toughness of the aluminum alloy to decrease, and it is easy to cause problems such as cracking and deformation, which not only affects the quality of the parts, but also increases the difficulty and cost of processing. 3) The annealing plus offline solid solution and aging treatment process is relatively complicated, which not only prolongs the production cycle, but also increases production costs. Therefore, the existing process needs to be further improved. Summary of the Invention

[0005] The purpose of the present invention is to provide a processing technology for flattening an aluminum alloy bracket at both ends that takes into account cost, strength and elongation, and 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 processing technology for an aluminum alloy bracket with flattened ends comprises the following steps.

[0008] 1) Design of alloy composition: By precisely controlling the content of various elements in the aluminum alloy, such as Mg, Si, Fe, Cu, Mn, Cr, Sn, La, etc., the aluminum alloy has good plasticity and toughness, while ensuring that the profile will not crack, deform, or have other problems during subsequent processing.

[0009] Among them, the Mg content is 0.7-1.0wt%, the Si content is 0.7-1.0wt%, and the Mg / Si ratio is controlled at 1.0-1.3. This control is mainly to avoid excessive Si reducing the plasticity of the material, and also to avoid too little Si affecting the strength after aging.

[0010] The Fe content is 0.1-0.3 wt%, and the difference between the Si element content and the Fe element content, Si-Fe, is controlled in the range of 0.5-0.7 wt%. This control is mainly to avoid the effective Si content being too low to affect the material strength.

[0011] The Cu content is 0.1-0.3 wt%, mainly to improve the strength of the material; the Mn content is 0.4-0.6wt%, the Cr content is 0.05-0.20wt%, and the La content is 0.05-0.2wt%. Among them, the composition control range of the sum of the Mn content, Cr content and La content (Mn+Cr+La) is 0.6-0.8wt%. This control is mainly to increase the recrystallization temperature of the material, reduce the grain size of the material, and thus greatly improve the plasticity of the material; the Sn content is 0.05-0.20wt%, mainly to delay the effect of hardening caused by natural aging and avoid the influence of long natural aging time on the performance after artificial aging.

[0012] 2) Melting and Casting: The aluminum alloy is placed in a melting furnace and heated to 700-750°C. Once completely melted, the aluminum liquid undergoes refining and online degassing to control the hydrogen content to less than 0.15ml / 100g. Impurities are filtered using a 50-mesh filter plate, and then the aluminum bar is cast into a 100mm diameter aluminum bar. Here, high-precision filter plates are used to filter impurities and strictly control the hydrogen content in the aluminum liquid to ensure the quality of the aluminum liquid and improve the performance of the profile.

[0013] 3) Homogenization and Insulation: Homogenize the aluminum bars at a temperature of 550-570°C for 8-10 hours. After homogenization, the cooling rate should be greater than 300°C / hour. By precisely controlling the temperature and time of the homogenization and insulation, as well as the subsequent cooling rate, the uniform structure and properties of the profiles are ensured.

[0014] 4) Extrusion molding: Heat the homogenized aluminum rod to 500-520℃ and put it into the extruder to extrude a round tube bracket profile with a wall thickness of 2mm and an outer diameter of 20mm. The extrusion profile discharge speed is 6-8m / min, the extrusion outlet temperature is ≥530℃, and the material is quickly cooled by water after discharge.

[0015] The appropriate extrusion temperature and speed, as well as the precisely controlled discharge port temperature, ensure the accurate size and shape of the profile, while avoiding problems such as cracking and deformation of the profile during the extrusion process.

[0016] 5) End stamping and flattening processing: The end stamping and flattening processing is directly carried out when the profile is not aged, without the need for annealing treatment, which greatly reduces the processing steps and heat treatment steps, improves production efficiency and reduces production costs.

[0017] 6) Aging treatment: After the parts are processed, they can be directly subjected to artificial aging treatment. The aging temperature is 160-180℃ and the insulation time is 8-10h, which greatly shortens the production cycle and reduces production costs.

[0018] Through the above technical means, the present invention not only solves the problems that arise in the annealing and flattening processing of profiles in the prior art, but also greatly reduces the processing steps and heat treatment steps, improves production efficiency, reduces production costs, and at the same time ensures the quality of parts.

[0019] Compared with the existing technology, the present invention primarily solves the following technical problems: 1) It solves the problem that the existing technology requires profiles to undergo high-temperature heating and slow cooling during annealing, which is not only time-consuming and energy-consuming, but also easily causes the profile dimensions to change, affecting the precision of the final component. 2) It solves the problem that the existing technology solves the problem that the profiles are prone to cracking and deformation during the flattening process at both ends due to the low plasticity and toughness of aluminum alloys, which not only affects the quality of the components but also increases the difficulty and cost of processing. 3) It solves the problem that the existing technology solves the complex process of annealing plus offline solution treatment and aging treatment, which not only prolongs the production cycle but also increases production costs.

[0020] On the other hand, the present invention further provides an aluminum alloy bracket with flattened ends, which is manufactured using the above-mentioned automotive aluminum alloy bracket processing technology.

[0021] On the other hand, the present invention also provides the use of the aluminum alloy bracket with flattened ends as described above in automobile parts.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects.

[0023] The aluminum alloy bracket processing technology provided by this invention omits the two steps of profile annealing and offline solution treatment, greatly simplifying the processing flow, improving production efficiency, and reducing production costs. Furthermore, by reducing the heat treatment process, it also avoids the quality fluctuations that may be caused by excessive heat treatment, thereby improving product consistency and stability.

[0024] 2. The aluminum alloy bracket processing technology provided by the present invention directly performs flattening processing on both ends after extruding the profile, avoiding the dimensional changes that may occur in the profile during the annealing process, thereby improving the accuracy and consistency of the parts.

[0025] 3. The aluminum alloy bracket processing technology provided by the present invention ensures the plasticity and toughness of the aluminum alloy profile by precisely controlling the alloy composition and the melting and casting process before the flattening processing at both ends, thereby reducing problems such as cracking and deformation that may occur during the flattening processing at both ends, and improving the quality and yield of parts.

[0026] 4. The aluminum alloy bracket processing technology provided by the present invention is placed naturally for 2-7 days before aging treatment to avoid the situation where the hardness is too high during natural aging and affects the effect of artificial aging, thereby improving the effect of aging treatment and further improving the mechanical properties of parts.

[0027] 5. The aluminum alloy bracket processing technology provided by the present invention ensures the structure and performance of the aluminum alloy profile by precisely controlling the extrusion temperature, speed and outlet temperature, as well as the subsequent rapid cooling through water, thereby improving the performance and reliability of the product.

[0028] In general, the aluminum alloy bracket processing technology of the present invention not only improves the performance and quality of the product, but also improves production efficiency and reduces production costs by optimizing alloy composition, improving smelting casting and extrusion molding processes, and simplifying heat treatment processes, and has significant advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Shown is a sample of an automotive aluminum alloy bracket with flattened ends, produced using Example 1 of the present invention.

[0030] Figure 2-Figure 3 The sample shown is a picture of the cracks that occurred in Comparative Example 1. DETAILED DESCRIPTION

[0031] 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.

[0032] 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

[0033] A process for processing an automotive aluminum alloy bracket with flattened ends, comprising the following specific steps: Step 1: Alloy composition design. First, elements such as Mg, Si, Fe, Cu, Mn, Cr, Sn, and La are precisely proportioned, with the following components: Mg content of 0.75%, Si content of 0.73%, a Mg / Si ratio of 1.03, Fe content of 0.15%, a Si-Fe content difference of 0.58%, Cu content of 0.28%, Mn content of 0.45%, Cr content of 0.12%, Sn content of 0.10%, La content of 0.14%, and a total of Mn, Cr, and La content of 0.71%. The remainder is Al. All calculations are by weight percentage.

[0034] Step 2: Melting and Casting Process: The aluminum alloy material is placed in a melting furnace and heated to 750°C. After complete melting, the hydrogen content of the aluminum liquid is controlled within 0.15ml / 100g through refining and online degassing. Impurities are filtered using a 50-mesh filter plate, and then cast into aluminum bars with a diameter of 100mm.

[0035] Step 3: Homogenization and heat preservation. Homogenize the aluminum bar at a temperature of 550°C for 8 hours. The cooling rate after homogenization needs to be greater than 300°C / h.

[0036] Step 4: Extrusion molding. The homogenized aluminum rod is heated to 500℃ and placed in an extruder. A round tube bracket profile with a wall thickness of 2mm and an outer diameter of 20mm is extruded. The extrusion profile discharge speed is 8m / min, and the temperature of the extrusion outlet is ≥530℃. After discharge, the profile is quickly cooled by running water.

[0037] Step 5: Punching and flattening of the ends. When the profile is not aged, use a punching machine to flatten the ends of the profile.

[0038] Step 6: Aging treatment: After the parts are processed, they are aged at 170°C for 8 hours.

[0039] The aluminum alloy bracket sample for automobiles with both ends flattened, as shown in Figure 1, prepared in this embodiment, has basically no flattening or cracking phenomenon. Example

[0040] A process for processing an automotive aluminum alloy bracket with flattened ends, comprising the following specific steps: Step 1: Alloy composition design. First, elements such as Mg, Si, Fe, Cu, Mn, Cr, Sn, and La are precisely proportioned, with the following components: Mg at 0.95%, Si at 0.75%, a Mg / Si ratio of 1.27, Fe at 0.2%, a Si-Fe difference of 0.6%, Cu at 0.15%, Mn at 0.55%, Cr at 0.10%, Sn at 0.12%, and La at 0.08%, with the sum of Mn, Cr, and La at 0.73%. The remainder is Al. All calculations are by weight percentage.

[0041] Step 2: Melting and Casting Process: The aluminum alloy material is placed in a melting furnace and heated to 700°C. After complete melting, the hydrogen content of the aluminum liquid is controlled within 0.15ml / 100g through refining and online degassing. Impurities are filtered using a 50-mesh filter plate, and then cast into aluminum bars with a diameter of 100mm.

[0042] Step 3: Homogenization and heat preservation. Homogenize the aluminum bar at a temperature of 560°C for 8 hours. The cooling rate after homogenization needs to be greater than 300°C / h.

[0043] Step 4: Extrusion molding. The homogenized aluminum rod is heated to 510℃ and placed in an extruder. A round tube bracket profile with a wall thickness of 2mm and an outer diameter of 20mm is extruded. The extrusion profile discharge speed is 7m / min, and the temperature of the extrusion outlet is ≥530℃. After discharge, the profile is quickly cooled by running water.

[0044] Step 5: Punching and flattening of the ends. When the profile is not aged, use a punching machine to flatten the ends of the profile.

[0045] Step 6: Aging treatment: After the parts are processed, they are aged at 170°C for 8 hours. Example

[0046] A process for processing an automotive aluminum alloy bracket with flattened ends, comprising the following specific steps: Step 1: Alloy composition design. First, elements such as Mg, Si, Fe, Cu, Mn, Cr, Sn, and La are precisely proportioned, with the following components: Mg content of 0.93%, Si content of 0.88%, a Mg / Si ratio of 1.06, Fe content of 0.21%, a Si-Fe content difference of 0.67%, Cu content of 0.26%, Mn content of 0.58%, Cr content of 0.14%, Sn content of 0.08%, La content of 0.06%, and a total of Mn, Cr, and La content of 0.78%. The remainder is Al. All calculations are by weight percentage.

[0047] Step 2: Melting and Casting Process: The aluminum alloy material is placed in a melting furnace and heated to 730°C. After complete melting, the hydrogen content of the aluminum liquid is controlled within 0.15ml / 100g through refining and online degassing. Impurities are filtered using a 50-mesh filter plate, and then cast into aluminum bars with a diameter of 100mm.

[0048] Step 3: Homogenization and heat preservation: Homogenize the aluminum bar at a temperature of 565°C for 8 hours. The cooling rate after homogenization needs to be greater than 300°C / h.

[0049] Step 4: Extrusion molding. The homogenized aluminum rod is heated to 515℃ and placed in an extruder. A round tube bracket profile with a wall thickness of 2mm and an outer diameter of 20mm is extruded. The extrusion profile discharge speed is 6m / min, and the temperature of the extrusion outlet is ≥530℃. After discharge, the profile is quickly cooled by running water.

[0050] Step 5: Punching and flattening of the ends. When the profile is not aged, use a punching machine to flatten the ends of the profile.

[0051] Step 6: Aging treatment: After the parts are processed, they are aged at 170°C for 8 hours.

[0052] Comparative Example 1

[0053] A process for processing an automotive aluminum alloy bracket with flattened ends, comprising the following specific steps: Step 1: Alloy composition design. First, elements such as Mg, Si, Fe, Cu, Mn, Cr, Sn, and La are precisely proportioned, with the following components: Mg content of 0.72%, Si content of 0.88%, a Mg / Si ratio of 0.82, Fe content of 0.22%, a Si-Fe content difference of 0.66%, Cu content of 0.27%, Mn content of 0.45%, Cr content of 0.14%, Sn content of 0.10%, and La content of 0.10%, with the sum of Mn, Cr, and La controlled at 0.69%; the remainder being Al. All calculations are by weight percentage.

[0054] Step 2: Melting and Casting Process: The aluminum alloy material is placed in a melting furnace and heated to 750°C. After complete melting, the hydrogen content of the aluminum liquid is controlled within 0.15ml / 100g through refining and online degassing. Impurities are filtered using a 50-mesh filter plate, and then cast into aluminum bars with a diameter of 100mm.

[0055] Step 3: Homogenization and heat preservation: Homogenize the aluminum bar at a temperature of 565°C for 8 hours. The cooling rate after homogenization needs to be greater than 300°C / h.

[0056] Step 4: Extrusion molding. The homogenized aluminum rod is heated to 500℃ and placed in an extruder. A round tube bracket profile with a wall thickness of 2mm and an outer diameter of 20mm is extruded. The extrusion profile discharge speed is 8m / min, and the temperature of the extrusion outlet is ≥530℃. After discharge, the profile is quickly cooled by running water.

[0057] Step 5: Punching and flattening of the ends. When the profile is not aged, use a punching machine to flatten the ends of the profile.

[0058] Step 6: Aging treatment: After the parts are processed, they are aged at 170°C for 8 hours.

[0059] The aluminum alloy bracket for automobiles with flattened ends prepared in this comparative example has cracks. Figure 2 、 Figure 3 shown.

[0060] Comparative Example 2.

[0061] A process for processing an automotive aluminum alloy bracket with flattened ends, comprising the following specific steps: Step 1: Alloy composition design. First, elements such as Mg, Si, Fe, Cu, Mn, Cr, Sn, and La are precisely proportioned, with the following components: Mg at 0.86%, Si at 0.67%, a Mg / Si ratio of 1.28, Fe at 0.28%, a Si-Fe difference of 0.39%, Cu at 0.15%, Mn at 0.43%, Cr at 0.14%, Sn at 0.12%, and La at 0.08%, with the sum of Mn, Cr, and La at 0.63%. The remainder is Al. All calculations are by weight percentage.

[0062] Step 2: Melting and Casting Process: The aluminum alloy material is placed in a melting furnace and heated until completely melted. The hydrogen content of the aluminum liquid is controlled within 0.15ml / 100g through refining and online degassing. Impurities are filtered using a 50-mesh filter plate, and then it is cast into aluminum bars with a diameter of 100mm.

[0063] Step 3: Homogenization and heat preservation: Homogenize the aluminum bar at a temperature of 565°C for 8 hours. The cooling rate after homogenization needs to be greater than 300°C / h.

[0064] Step 4: Extrusion molding. The homogenized aluminum rod is heated to 500℃ and placed in an extruder. A round tube bracket profile with a wall thickness of 2mm and an outer diameter of 20mm is extruded. The extrusion profile discharge speed is 8m / min, and the temperature of the extrusion outlet is ≥530℃. After discharge, the profile is quickly cooled by running water.

[0065] Step 5: Punching and flattening of the ends. When the profile is not aged, use a punching machine to flatten the ends of the profile.

[0066] Step 6: Aging treatment: After the parts are processed, they are aged at 170°C for 8 hours.

[0067] Comparative Example 3.

[0068] A process for processing an automotive aluminum alloy bracket with flattened ends, comprising the following specific steps: Step 1: Alloy composition design. First, elements such as Mg, Si, Fe, Cu, Mn, Cr, Sn, and La are precisely proportioned, with the following components: Mg at 0.86%, Si at 0.77%, a Mg / Si ratio of 1.12, Fe at 0.20%, a Si-Fe difference of 0.57%, Cu at 0.18%, Mn at 0.41%, Cr at 0.06%, Sn at 0.11%, and La at 0.07%, with the sum of Mn, Cr, and La at 0.54%. The remainder is Al. All calculations are by weight percentage.

[0069] Step 2: Melting and Casting Process: The aluminum alloy material is placed in a melting furnace and heated until completely melted. The hydrogen content of the aluminum liquid is controlled within 0.15ml / 100g through refining and online degassing. Impurities are filtered using a 50-mesh filter plate, and then it is cast into aluminum bars with a diameter of 100mm.

[0070] Step 3: Homogenization and heat preservation: Homogenize the aluminum bar at a temperature of 565°C for 8 hours. The cooling rate after homogenization needs to be greater than 300°C / h.

[0071] Step 4: Extrusion molding. The homogenized aluminum rod is heated to 500℃ and placed in an extruder. A round tube bracket profile with a wall thickness of 2mm and an outer diameter of 20mm is extruded. The extrusion profile discharge speed is 8m / min, and the temperature of the extrusion outlet is ≥530℃. After discharge, the profile is quickly cooled by running water.

[0072] Step 5: Punching and flattening of the ends. When the profile is not aged, use a punching machine to flatten the ends of the profile.

[0073] Step 6: Aging treatment: After the parts are processed, they are aged at 170°C for 8 hours.

[0074] Comparative Example 4.

[0075] A process for processing an automotive aluminum alloy bracket with flattened ends, comprising the following specific steps: Step 1: Alloy composition design. First, elements such as Mg, Si, Fe, Cu, Mn, Cr, Sn, and La are precisely proportioned, with the following components: Mg content of 0.77%, Si content of 0.72%, a Mg / Si ratio of 1.07, Fe content of 0.15%, a Si-Fe content difference of 0.57%, Cu content of 0.22%, Mn content of 0.47%, Cr content of 0.10%, Sn content of 0.02%, La content of 0.10%, and a total of Mn, Cr, and La content of 0.67%. The remainder is Al. All calculations are by weight percentage.

[0076] Step 2: Melting and Casting Process: The aluminum alloy material is placed in a melting furnace and heated until completely melted. The hydrogen content of the aluminum liquid is controlled within 0.15ml / 100g through refining and online degassing. Impurities are filtered using a 50-mesh filter plate, and then it is cast into aluminum bars with a diameter of 100mm.

[0077] Step 3: Homogenization and heat preservation: Homogenize the aluminum bar at a temperature of 565°C for 8 hours. The cooling rate after homogenization needs to be greater than 300°C / h.

[0078] Step 4: Extrusion molding. The homogenized aluminum rod is heated to 500℃ and placed in an extruder. A round tube bracket profile with a wall thickness of 2mm and an outer diameter of 20mm is extruded. The extrusion profile discharge speed is 8m / min, and the temperature of the extrusion outlet is ≥530℃. After discharge, the profile is quickly cooled by running water.

[0079] Step 5: Punching and flattening of the ends. When the profile is not aged, use a punching machine to flatten the ends of the profile.

[0080] Step 6: Aging treatment. After the parts are processed, they are aged at 170°C for 8 hours.

[0081] Tensile strength after aging MPa Yield strength after aging MPa Elongation after aging % Flattening yield after 2 days Yield rate after 7 days of flattening Flattening yield after 10 days Example 1 342 305 13.5 100% 100% 88% Example 2 338 299 14.7 100% 100% 94% Example 3 351 312 14.3 100% 100% 91% Comparative Example 1 345 310 10.2 80% 65% 43% Comparative Example 2 298 261 15.2 100% 100% 98% Comparative Example 3 341 302 13.2 98% 95% 85% Comparative Example 4 332 295 14.2 100% 92% 80% .

[0082] As can be seen from Table 1, the alloy composition design of the present invention is particular. When one or more of the composition design features changes, one or more of the strength, elongation, and flattening yield will deteriorate, and the effect of taking all the strength, elongation, and flattening yield into consideration cannot be achieved.

[0083] Due to the advanced nature of the present invention, it has broad application prospects in the automotive manufacturing, metal processing, and aluminum alloy materials fields. In the automotive manufacturing field, the present invention provides a novel process for processing automotive aluminum alloy brackets with flattened ends. This process not only improves the mechanical properties of the aluminum alloy brackets, but also significantly reduces the number of component processing steps, thereby reducing production costs. Furthermore, due to the advantages of aluminum alloys such as light weight, high strength, and excellent corrosion resistance, the present invention has broad application prospects in the manufacturing of automotive structural parts and engine components. In the metal processing field, the present invention provides a novel process for processing aluminum alloy profiles. This process not only improves the plasticity and toughness of aluminum alloy profiles, but also prevents problems such as cracking and deformation during processing. Furthermore, due to the excellent machinability of aluminum alloys, the present invention has broad application prospects in the metal processing field. In the aluminum alloy materials field, the present invention provides a novel process for processing aluminum alloy materials. This process not only improves the mechanical properties of aluminum alloy materials, but also prevents problems such as cracking and deformation during processing. Furthermore, due to the excellent overall performance of aluminum alloy materials, the present invention has broad application prospects in the aluminum alloy materials field.

[0084] In general, due to its unique process and technical advantages, the present invention can not only improve the quality and performance of aluminum alloy products, but also significantly reduce production costs and improve production efficiency. Therefore, it has broad application prospects and market demand in application fields such as automobile manufacturing, metal processing and aluminum alloy materials.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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 process for processing an aluminum alloy bracket with flattened ends, characterized in that: Here are the steps: 1) Design alloy composition: Precisely control the content of various elements in the aluminum alloy, including Mg 0.7-1.0wt%, Si 0.7-1.0wt%, Mg / Si ratio controlled at 1.0-1.3; Fe 0.1-0.3wt%, the difference between Si and Fe content controlled at 0.5-0.7wt%; Cu 0.1-0.3wt%, Mn 0.4-0.6wt%, Cr 0.05-0.20wt%, La 0.05-0.2wt%, the sum of Mn, Cr, and La content controlled at 0.6-0.8wt%; Sn 0.05-0.20wt%; the balance is Al; 2) Melting and Casting: The aluminum alloy material is placed in a melting furnace, heated and completely melted, and then the hydrogen content of the aluminum liquid is controlled within 0.15ml / 100g through refining and online degassing. Impurities are filtered using a filter plate, and then the aluminum is cast into aluminum bars; 3) Homogenization and insulation: The aluminum bars are homogenized to ensure uniform structure and performance of the profiles. During the homogenization and insulation step, the homogenization and insulation temperature is 550-570℃, the insulation time is 8-10h, and the cooling rate after homogenization is greater than 300℃ / h. 4) Extrusion molding: The homogenized aluminum rod is heated and placed in an extruder to extrude a round tube bracket profile. During the extrusion molding step, the homogenized aluminum rod is heated to 500-520°C and placed in an extruder. The extruded profile is discharged at a speed of 6-8 m / min, and the temperature at the extrusion outlet is ≥530°C. After discharge, the profile is quickly cooled by passing through water. 5) End stamping and flattening processing: the end stamping and flattening processing is directly carried out when the profile is not aged; 6) Aging treatment: After the parts are processed, artificial aging treatment is carried out. During the aging treatment step, the aging temperature is 160-180℃ and the holding time is 8-10h.

2. The process for processing an aluminum alloy bracket with flattened ends according to claim 1, characterized in that: In the melting and casting step, the heating and melting temperature is 700-750°C.

3. The process for processing an aluminum alloy bracket with flattened ends according to claim 1, characterized in that: In the smelting and casting steps, the filter plate is a high-precision filter plate with a pore size less than 50 meshes.

4. An aluminum alloy bracket with flattened ends, characterized in that: The bracket is manufactured by using the processing technology of an aluminum alloy bracket with flattened ends as described in any one of claims 1 to 3.

5. Application of the aluminum alloy bracket with flattened ends as claimed in claim 4 in automobile parts.

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