6061 aluminum alloy chip solid-state recycled extruded material and method of making

Abstract

The application relates to a 6061 aluminum alloy chip solid-state recycling extrusion material and a preparation method, and the preparation method comprises the following steps: step 1, cleaning and drying 6061 aluminum alloy chips to obtain clean chips; step 2, placing the clean chips into a mold to be cold-pressed into a blank by using a hydraulic machine; step 3, loading the blank after cold pressing into a rubber mold to be cold isostatic pressed by using an isostatic pressing machine; step 4, hot extruding the cold isostatic pressing blank by using an extruding machine to obtain an extrusion product; step 5, solid solution treating the extruded product, setting the furnace temperature to 550 DEG C, entering the furnace after being heated to the temperature, keeping warm for a certain time, and quenching; and step 6, aging treating the material after quenching, setting the furnace temperature to 170 DEG C, keeping warm for a certain time, and taking out. In the production process of the aluminum alloy profile, the cold isostatic pressing is adopted in the pre-compaction stage, and the extrusion temperature, the extrusion ratio and the aging time in the extrusion process are controlled, so that the aluminum alloy profile with excellent mechanical properties can be prepared.

Description

A solid recycled extruded material of 6061 aluminum alloy chips and its preparation method Technical Field

[0001] This invention relates to the field of aluminum alloy technology, specifically to a solid recycled extruded material of 6061 aluminum alloy chips and its preparation method. Background Technology

[0002] The recycling of aluminum alloy chips is of great significance for promoting efficient resource recycling, reducing production costs, and minimizing environmental pollution. Especially for 6061 aluminum alloy, a material widely used in aerospace, automotive, and construction, the development of solid-state recycling technology has become an urgent need within the industry.

[0003] Hot extrusion, as a core technology for solid-state recycling, directly reprocesses waste and chips through physical methods, avoiding the energy consumption and environmental impact of traditional smelting processes. Recent research and patented technologies have focused on the effective recycling and utilization of aluminum alloy chips, particularly improving material properties through optimization of the hot extrusion process. During hot extrusion, precise control of key process parameters such as extrusion temperature, rate, and extrusion ratio is crucial for grain refinement and material performance improvement. Furthermore, subsequent aging treatment promotes the uniform distribution of precipitated phases, further enhancing the material's mechanical properties. Patent literature shows that innovative pretreatment technologies and extrusion die designs have a significant impact on improving chip recycling efficiency and optimizing the microstructure of recycled materials. For example, reducing material oxidation and loss through specific pretreatment processes, and achieving more uniform material flow and microstructure control through improved extrusion dies, both contribute to improving the performance of recycled materials.

[0004] Despite advancements in existing technologies, challenges remain, such as material loss during pretreatment, cleanliness control, and optimization of process parameters. Future research needs to further explore more effective pretreatment methods, develop precise process parameter control technologies, and design more rational extrusion dies, aiming to achieve efficient and high-value utilization of aluminum alloy chips. In conclusion, solid-state recycling technology for aluminum alloy chips and related patent innovations are of great significance for promoting the recycling of aluminum resources and achieving green manufacturing. With continuous technological advancements, we look forward to realizing more environmentally friendly and efficient solutions for the recycling and reuse of aluminum alloy chips in the future.

[0005] Current solid-state recycling processes for 6061 aluminum alloy chips generally suffer from low performance, long production cycles, and high energy consumption. Therefore, a novel method for preparing solid-state recycled 6061 aluminum alloy chip extrusions is needed. Summary of the Invention

[0006] To address the problems existing in the prior art, the purpose of this invention is to provide a solid recycled 6061 aluminum alloy chip extrusion and its preparation method, which can improve the strengthening effect of the solid recycled 6061 aluminum alloy chip extrusion and obtain aluminum alloy profiles with good mechanical properties while saving more energy.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A method for preparing solid recycled 6061 aluminum alloy chip extrusion, characterized by comprising the following steps:

[0009] Step 1: Clean and dry the 6061 aluminum alloy chips to obtain clean chips;

[0010] Step 2: Place the cleaned chips into a mold and cold press them with a hydraulic press to form a blank;

[0011] Step 3: Load the cold-pressed billet into a rubber mold and perform cold isostatic pressing using an isostatic press;

[0012] Step 4: Use an extruder to hot-extrude the cold isostatic billet to obtain the extruded product;

[0013] Step 5: Perform solution treatment on the extruded product. Set the furnace temperature to 540-560℃, place the product into the furnace at the set temperature, hold for a certain time, and then quench it.

[0014] Step 6: Perform aging treatment on the water-quenched material. Set the furnace temperature to 160-180℃ and hold for a period of time. Then remove the material.

[0015] Furthermore, in step 1, the chips are cleaned with anhydrous ethanol as the cleaning agent using ultrasound at room temperature (25°C) for 15 minutes, and then the cleaned chips are placed in a drying oven and dried at 60°C for 15 minutes.

[0016] Furthermore, in step 2, the cold pressing pressure is 850 MPa, and the holding time is 5-10 seconds.

[0017] Furthermore, in step 3, the cold isostatic pressure is 250 MPa, and the holding time is 90-120 s.

[0018] Furthermore, in step 4, the preheating temperature of the cold isostatic pressing billet is 400-450℃, the extrusion ratio is 15-60, and the extrusion speed is 2-4 mm per second.

[0019] Furthermore, in step 4, the preheating temperature of the cold isostatic pressing billet during the extrusion process is 400-500℃, the extrusion ratio is set to 10-60, and the extrusion bar forward speed is 3mm / s.

[0020] Furthermore, in step 5, the furnace temperature is set to 550℃, the holding time is 80min, and after the solution treatment is completed, the furnace is directly quenched in water for cooling, with a quenching transfer time of less than 2s.

[0021] Furthermore, in step 6, the furnace temperature is set to 170℃, and the holding time is 4-14 hours.

[0022] A solid recycled extruded material of 6061 aluminum alloy chips is prepared by the above-mentioned preparation method.

[0023] Furthermore, the solid recycled extruded material of 6061 aluminum alloy chips comprises the following components: Mg 0.80-0.90 wt.%, Si 0.70-0.80 wt.%, Fe 0.20 wt.%, Cu≤0.20 wt.%, Mn 0.05-0.10 wt.%, Cr 0.15 wt.%, Ti 0.03 wt.%, Zn 0.04 wt.%, with the balance being Al.

[0024] In summary, the present invention has the following advantages:

[0025] In the production process of aluminum alloy profiles, by using cold isostatic pressing in the pre-compaction stage and controlling the heating temperature of the extruded billet, the extrusion ratio, and the use of aging methods during the extrusion process, the strengthening effect of 6061 aluminum alloy can be improved, the energy consumption required for 6061 alloy to reach peak strength can be significantly reduced, the productivity of the alloy can be improved, and the products can be well applied to actual factory production. Attached Figure Description

[0026] Figure 1 is a flowchart of an embodiment of the present invention. Detailed Implementation

[0027] The present invention will now be described in further detail.

[0028] Example 1

[0029] As shown in Figure 1, 6061 aluminum alloy chips (composition shown in Table 1) were cleaned and dried. Anhydrous ethanol was used as the cleaning agent, and ultrasonic cleaning was performed at room temperature (25°C) for 15 minutes. After that, the cleaned chips were placed in a drying oven and dried at 60°C for 15 minutes to obtain clean chips.

[0030] The cleaned chips are placed into a mold and cold-pressed into a blank using a hydraulic press. The process conditions are: cold pressing pressure 850 MPa, holding time 5 s.

[0031] The cold-pressed billet is placed into a rubber mold and subjected to cold isostatic pressing using an isostatic press. The process conditions are: cold isostatic pressing pressure 250 MPa, holding time 90 s.

[0032] The extruded product is obtained by hot extrusion of cold isostatic billets using an extruder. The process conditions are: extrusion ratio 56.3, extrusion temperature 425℃, and extrusion bar forward speed 3mm / s.

[0033] The extruded product is subjected to solution treatment at a furnace temperature of 550℃. The product is placed in the furnace at the set temperature and held for 80 minutes. After solution treatment, it is directly quenched in water for cooling, with a quenching transfer time of less than 2 seconds.

[0034] The water-quenched material was subjected to aging treatment, with the furnace temperature set at 170℃ and held for 4 hours.

[0035] Example 2

[0036] The 6061 aluminum alloy chips (composition shown in Table 1) were cleaned and dried. Anhydrous ethanol was used as the cleaning agent, and the chips were cleaned ultrasonically at room temperature (25°C) for 15 minutes. After that, the cleaned chips were placed in a drying oven and dried at 60°C for 15 minutes to obtain clean chips.

[0037] The cleaned chips are placed into a mold and cold-pressed into a blank using a hydraulic press. The process conditions are: cold pressing pressure 850 MPa, holding time 5 s.

[0038] The cold-pressed billet is placed into a rubber mold and subjected to cold isostatic pressing using an isostatic press. The process conditions are: cold isostatic pressing pressure 250 MPa, holding time 90 s.

[0039] The extruded product is obtained by hot extrusion of cold isostatic billets using an extruder. The process conditions are: extrusion ratio 14.1, extrusion temperature 425℃, and extrusion bar forward speed 3mm / s.

[0040] The extruded product is subjected to solution treatment at a furnace temperature of 550℃. The product is placed in the furnace at the set temperature and held for 80 minutes. After solution treatment, it is directly quenched in water for cooling, with a quenching transfer time of less than 2 seconds.

[0041] The water-quenched material was subjected to aging treatment at a furnace temperature of 170°C for 10 hours. (Example 3)

[0042] The 6061 aluminum alloy chips (composition shown in Table 1) were cleaned and dried. Anhydrous ethanol was used as the cleaning agent, and the chips were cleaned ultrasonically at room temperature (25°C) for 15 minutes. After that, the cleaned chips were placed in a drying oven and dried at 60°C for 15 minutes to obtain clean chips.

[0043] The cleaned chips are placed into a mold and cold-pressed into a blank using a hydraulic press. The process conditions are: cold pressing pressure 850 MPa, holding time 5 s.

[0044] The cold-pressed billet is placed into a rubber mold and subjected to cold isostatic pressing using an isostatic press. The process conditions are: cold isostatic pressing pressure 250 MPa, holding time 90 s.

[0045] The extruded product is obtained by hot extrusion of cold isostatic billets using an extruder. The process conditions are: extrusion ratio 56.3, extrusion temperature 400℃, and extrusion bar forward speed 3mm / s.

[0046] The extruded product is subjected to solution treatment at a furnace temperature of 550℃. The product is placed in the furnace at the set temperature and held for 80 minutes. After solution treatment, it is directly quenched in water for cooling, with a quenching transfer time of less than 2 seconds.

[0047] The water-quenched material was subjected to aging treatment, with the furnace temperature set at 170℃ and held for 10 hours.

[0048] Example 4

[0049] The 6061 aluminum alloy chips (composition shown in Table 1) were cleaned and dried. Anhydrous ethanol was used as the cleaning agent, and the chips were cleaned ultrasonically at room temperature (25°C) for 15 minutes. After that, the cleaned chips were placed in a drying oven and dried at 60°C for 15 minutes to obtain clean chips.

[0050] The cleaned chips are placed into a mold and cold-pressed into a blank using a hydraulic press. The process conditions are: cold pressing pressure 850 MPa, holding time 5 s.

[0051] The cold-pressed billet is placed into a rubber mold and subjected to cold isostatic pressing using an isostatic press. The process conditions are: cold isostatic pressing pressure 250 MPa, holding time 90 s.

[0052] The extruded product is obtained by hot extrusion of cold isostatic billets using an extruder. The process conditions are: extrusion ratio 56.3, extrusion temperature 425℃, and extrusion bar forward speed 3mm / s.

[0053] The extruded product is subjected to solution treatment at a furnace temperature of 550℃. The product is placed in the furnace at the set temperature and held for 80 minutes. After solution treatment, it is directly quenched in water for cooling, with a quenching transfer time of less than 2 seconds.

[0054] The water-quenched material was subjected to aging treatment, with the furnace temperature set at 170℃ and held for 10 hours.

[0055] Example 5

[0056] The 6061 aluminum alloy chips (composition shown in Table 1) were cleaned and dried. Anhydrous ethanol was used as the cleaning agent, and the chips were cleaned ultrasonically at room temperature (25°C) for 15 minutes. After that, the cleaned chips were placed in a drying oven and dried at 60°C for 15 minutes to obtain clean chips.

[0057] The clean chips are put into a mold and cold-pressed by a hydraulic press to form a blank. Process conditions: cold pressing pressure 850 MPa, pressure holding time 5 s.

[0058] The cold-pressed blank is loaded into a rubber mold and cold isostatic pressing is carried out using an isostatic press. Process conditions: cold isostatic pressing pressure 250 MPa, pressure holding time 90 s.

[0059] The cold isostatic pressed blank is hot-extruded using an extruder to obtain an extrusion product. Process conditions: extrusion ratio 56.3, extrusion temperature 425 °C, forward speed of the extrusion rod 3 mm / s.

[0060] The extruded product is subjected to solution treatment. The furnace temperature is set at 550 °C, put into the furnace when reaching the temperature, hold for 80 min, and directly quenched into water for cooling after the solution treatment ends. The quenching transfer time is less than 2 s.

[0061] The water-quenched material is subjected to aging treatment. The furnace temperature is set at 170 °C and hold for 12 h.

[0062] Table 1. Mass percentage (wt.%) of each component of 6061 aluminum alloy chips

[0063]

[0064] The aluminum alloy profiles of Examples 1 to 5 are subjected to mechanical property tests. The mechanical properties tested include tensile strength and elongation rate. Among them, 3 parallel specimens are selected for testing in each example. The obtained mechanical properties are compared with the product performance requirements: when both performance indicators are higher than the product performance requirements, the sample is qualified; when one performance data is lower than the product performance requirements, the sample is unqualified. The specific data and the qualification status of the samples are shown in Table 2.

[0065] Table 2. Comparison of mechanical property data of aluminum alloy extrusions in Examples 1 to 5

[0066]

[0067] As can be seen from Table 2, the aluminum alloy extrusions of Examples 1, 4, and 5 of the present invention all meet the product performance requirements. The tensile strength of the aluminum alloy extrusions of Examples 1, 4, and 5 of the present invention is between 178.3 and 268.4 Mpa, and the elongation rate is between 17.5 and 24.3, which is significantly higher than the product performance requirements. In contrast, the aluminum alloy extrusions of Examples 2 and 3 do not meet the product performance requirements, that is, the products are unqualified.

[0068] Specifically, comparing Examples 2 and 4, it can be seen that Example 4, by increasing the extrusion ratio, improved the tensile strength of the extruded product compared to Example 2, increasing it by 115.3 MPa, thus meeting the product performance requirements and ensuring the quality of the aluminum alloy extruded material. Comparing Examples 3 and 4, it can be seen that Example 4, by increasing the extrusion temperature, improved the tensile strength of the extruded product compared to Example 3, increasing it by 89.1 MPa, thus meeting the product performance requirements and ensuring the quality of the aluminum alloy extruded material. Comparing Examples 1, 4, and 5, it can be seen that the optimal aging time for the alloy under the stated conditions (aging temperature 170℃) is 10 hours, at which point the tensile strength is 268.4 MPa. Therefore, in the production process of aluminum alloy profiles, by using cold isostatic pressing in the pre-compaction stage and by controlling the heating temperature of the extruded billet, the extrusion ratio, and the aging time during the extrusion process, the strengthening effect of 6061 aluminum alloy chip solid-state recycled profiles can be improved, thereby obtaining aluminum alloy profiles with good mechanical properties with lower energy consumption.

[0069] In summary, this invention improves the tensile strength and elongation of aluminum alloy shavings solid recycled profiles by controlling key production factors such as cold pressing pressure, cold pressing holding time, cold isostatic pressing pressure, cold isostatic pressing holding time, extrusion temperature, extrusion ratio, aging temperature, and aging time during the production process of aluminum alloy shavings solid recycled profiles. Furthermore, by optimizing the aging scheme, the heat treatment time of aluminum alloy extrusions is significantly shortened, meeting industrial production needs while increasing the productivity of the aluminum alloy extrusions and greatly reducing energy consumption.

[0070] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A method for preparing solid recycled extruded material from 6061 aluminum alloy chips, characterized in that: The process includes the following steps: Step 1: Clean and dry the 6061 aluminum alloy chips to obtain clean chips; Step 2: Place the clean chips into a mold and cold press them into a billet using a hydraulic press. The cold pressing pressure is 850 MPa, and the holding time is 5-10 seconds; Step 3: Place the cold-pressed billet into a rubber mold and perform cold isostatic pressing using an isostatic press. The cold isostatic pressing pressure is 250 MPa, and the holding time is 90-120 seconds; Step 4: Use an extruder to hot extrude the cold isostatic pressing billet to obtain the extruded product. The preheating temperature of the cold isostatic pressing billet is 425℃, the extrusion ratio is 56.3, and the extrusion speed is 3 mm per second; Step 5: Perform solution treatment on the extruded product. Set the furnace temperature to 550℃, place the product in the furnace at the set temperature, hold for 80 minutes, and then quench it after solution treatment. The quenching transfer time is less than 2 seconds; Step 6: Perform aging treatment on the water-quenched material. Set the furnace temperature to 170℃, hold for 10 hours, and then remove the product.

2. The method for preparing a solid recycled extruded material of 6061 aluminum alloy chips according to claim 1, characterized in that: In step 1, the chips are cleaned with anhydrous ethanol as the cleaning agent and ultrasonically cleaned at room temperature (25°C) for 15 minutes. After that, the cleaned chips are placed in a drying oven and dried at 60°C for 15 minutes.

3. The method for preparing a solid recycled extruded material of 6061 aluminum alloy chips according to claim 1 or 2, characterized in that: The solid recycled extruded material of 6061 aluminum alloy chips includes the following components: Mg 0.80-0.90 wt.%, Si 0.70-0.80 wt.%, Fe 0.20 wt.%, Cu≤ 0.20 wt.%, Mn 0.05-0.10 wt.%, Cr 0.15 wt.%, Ti 0.03 wt.%, Zn 0.04 wt.%, with the balance being Al.

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