Production process of high-performance aluminum pipe for lawn mower

Abstract

This invention relates to a manufacturing process for high-performance lawnmower aluminum tubes, specifically within the field of aluminum tube processing technology. The process includes the following steps: Step 1: An aluminum alloy comprising the following components is extruded using an aluminum alloy extrusion apparatus according to the following mass percentages: Si: 0.51-0.56%, Mg: 0.60-0.65%, Fe: ≤0.2%, Zn: ≤0.05%, Cu: ≤0.05%, Mn: ≤0.05%, with the balance being Al; Step 2: The extruded profile is placed in an aging furnace, heated to 180℃ and held for 6-8 hours. After exiting the furnace, it is cooled by strong airflow at a wind speed greater than 2500 m / s. 3 / h; Step 3: The aged profile is first pickled, then oxidized in a solution of free NH4HF2 and Al3+; Step 4: The profile is placed in a Ni2SO4 solution for a sealing reaction. This invention optimizes the alloy composition ratio of the material and adjusts the extrusion production process, thereby improving material strength, reducing material weight, and lowering costs.

Description

Technical Field

[0001] This invention relates to the field of aluminum tube processing technology, and in particular to a production process for high-performance lawnmower aluminum tubes. Background Technology

[0002] Aluminum alloy profiles are widely used in aerospace, vehicles, ships, building doors and windows, and industrial structures due to their low density, high specific strength, excellent corrosion resistance, and ease of processing and forming. In the field of garden equipment, components such as the control lever and handle of lawnmowers are often made of aluminum alloy tubing to meet the requirements of lightweight and portability.

[0003] Currently, 6063 aluminum alloy is commonly used for the aluminum tubing of lawnmowers used in garden equipment. 6063 aluminum alloy belongs to the Al-Mg-Si system of heat-treatable alloys, with Mg and Si as its main alloying elements. Mg and Si form the strengthening phase Mg2Si. The mechanical properties of 6063 aluminum alloy profiles are closely related to the content of the Mg2Si strengthening phase. When the Mg2Si content is within a certain range, the tensile strength increases approximately linearly with the increase of the Mg2Si content.

[0004] However, the strength of ordinary 6063 aluminum alloy materials in existing technologies is relatively low. To ensure sufficient structural strength in lawnmower aluminum tubing, it is often necessary to increase the wall thickness of the tubing. This leads to increased material costs and an increase in the overall weight of the equipment. For lawnmowers that need to be handheld or carried, the increased weight significantly increases the workload of the operator, easily leading to fatigue during prolonged use. Therefore, it is crucial to improve the mechanical properties of aluminum alloy tubing without excessively increasing the wall thickness, thereby achieving lightweight and low-cost lawnmower aluminum tubing. Summary of the Invention

[0005] To address the aforementioned technical problems, the present invention provides a manufacturing process for high-performance lawnmower aluminum tubes, comprising the following steps:

[0006] Step 1: Place the aluminum alloy containing the following components into an aluminum alloy extrusion machine for extrusion according to the following mass percentages: Si: 0.51-0.56%, Mg: 0.60-0.65%, Fe: ≤0.2%, Zn: ≤0.05%, Cu: ≤0.05%, Mn: ≤0.05%, with the balance being Al;

[0007] Step 2: Place the extruded profile into an aging furnace, heat to 180℃ and hold for 6-8 hours. After removing from the furnace, cool with strong airflow at a speed greater than 2500 m / s. 3 / h;

[0008] Step 3: First, pickle the aged profiles, then expose them to free NH4HF2 and Al. 3+Oxidation treatment is carried out in the solution;

[0009] Step 4: Place the profile in a Ni2SO4 solution for a sealing reaction.

[0010] Preferably, in step one, the aluminum rod temperature of the aluminum alloy extrusion equipment is set to 480-500℃, the die temperature to 470-490℃, the extrusion cylinder temperature to 415-425℃, and the outlet profile temperature to ≥525℃, with strong air cooling at the outlet.

[0011] Preferably, in step one, the temperature of the aluminum rod is checked every 40-50 minutes, and the temperature of the discharge port profile is checked every 20-40 minutes.

[0012] Preferably, a quenching process is performed between step one and step two. The quenching is carried out when the profile is extruded from the aluminum alloy extrusion equipment, with a cooling rate of 100-120℃ / min and the profile extrusion speed controlled at 19-22m / min.

[0013] Preferably, in step two, the temperature is raised from room temperature to 180°C and the holding time is 6-9 hours.

[0014] Preferably, in step three, the pickling solution is an NH4HF2 solution with a concentration of 20-28 g / L, a temperature of 44-55℃, and an oxidation time of 300-500 s.

[0015] Preferably, in step three, the profile is neutralized after pickling and then oxidized. The neutralization process is as follows: the profile is placed in a solution of H2SO4 with a concentration of 140-180 g / L and HNO3 with a concentration of 30-70 g / L at room temperature and reacted for 1-5 minutes.

[0016] Preferably, the concentration of free sulfuric acid in step three is 150-190 g / L, Al 3+ The concentration is <20g / L, and the temperature is 18-22℃.

[0017] Preferably, between step three and step four, there is an oil removal process: adding an oil remover and treating at room temperature for 100-300 seconds.

[0018] Preferably, the concentration of the Ni2SO4 solution in step four is 0.8-1.2 g / L, the pH value is 5.5-6.0, and the solution temperature is 50-59℃.

[0019] The present invention has at least the following beneficial effects:

[0020] 1. By controlling the content of the Mg2Si reinforcing phase to approximately 0.96%, the finished profile exhibits a hardness ≥14.5 degrees, tensile strength ≥265 MPa, yield strength ≥250 MPa, and elongation ≥8%. Compared to existing ordinary 6063 aluminum alloy profiles, the tensile strength of this invention is significantly improved, meeting the requirements for use in lawnmower aluminum tubes under complex stress conditions.

[0021] 2. Due to the significantly improved mechanical properties of the profile in this invention, the wall thickness of the aluminum tube can be significantly reduced under the same load-bearing conditions, thereby reducing the weight of the aluminum tube. This is especially important for handheld and backpack lawnmowers, as lightweight equipment can effectively reduce the physical exertion of operators, reduce fatigue during long-term operation, and improve user experience and work efficiency.

[0022] 3. This invention allows for a reduction in aluminum tube wall thickness while improving material strength, thus reducing the amount of aluminum alloy used per unit length of aluminum tube and lowering raw material costs. Furthermore, the invention employs a rational alloy element ratio, avoiding the use of expensive, high-content alloy elements and further controlling production costs.

[0023] 4. This invention utilizes a multi-step process involving extrusion, aging, oxidation, and surface sealing. The process parameters for each step (such as extrusion temperature, aging temperature and time, and cooling rate) can be achieved on conventional industrial equipment, making operation simple and facilitating mass production. Furthermore, the invention employs online quenching combined with forced-air cooling to effectively ensure the uniformity of the profile's microstructure and the stability of its mechanical properties.

[0024] 5. This invention utilizes multiple surface treatment processes, including pickling, neutralization, oxidation, and nickel salt sealing, to form a dense oxide film and sealing layer on the profile surface, effectively improving the corrosion resistance and surface appearance quality of the aluminum tube. The sealing process uses Ni2SO4 solution, which can complete the sealing of a 1μm thick oxide film in approximately 1.5 minutes, demonstrating high processing efficiency. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 The relationship between the tensile strength of the alloy and the mass fraction of Mg2Si;

[0027] Figure 2 This represents the relationship between the elongation of the alloy and the mass fraction of Mg2Si. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or server that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0030] The manufacturing process for high-performance lawnmower aluminum tube profiles provided by this invention mainly includes the following steps: extrusion treatment, aging treatment, oxidation treatment, and surface sealing. Furthermore, auxiliary processes such as quenching treatment, neutralization treatment, and degreasing treatment can be added between each step as needed to further optimize the mechanical properties and surface quality of the profile. The technical solution of this invention is described in detail below through several embodiments:

[0031] Example 1

[0032] A manufacturing process for high-performance aluminum tubing profiles for lawnmowers includes the following steps:

[0033] Step 1: Add the following aluminum alloy components by mass percentage to an aluminum alloy extrusion machine for extrusion: Si: 0.52%, Mg: 0.60%, Fe: 0.16%, Zn: 0.03%, Cu: 0.01%, Mn: 0.05%, with the balance being Al. Set the aluminum rod temperature to 480℃, die temperature to 482℃, extrusion barrel temperature to 420℃, and the outlet profile temperature to 520℃. Use forced air cooling at the outlet. Check the aluminum rod temperature every 40 minutes and the outlet profile temperature every 20 minutes. Quench the profile as it is extruded from the aluminum alloy extrusion machine at a cooling rate of 110℃ / min, and control the extrusion speed at 19 m / min.

[0034] Step 2: Place the extruded profile into an aging furnace, heat it from room temperature to 180°C and hold it for 8 hours. After removing it from the furnace, cool it with strong air at a wind speed greater than 2500 m³ / h.

[0035] Step 3: The aged profiles are first pickled using an NH4HF2 solution at a concentration of 30 g / L at 45°C for 500 seconds. After pickling, a neutralization treatment is performed: the profiles are placed in a solution of 180 g / L H2SO4 and 70 g / L HNO3 at room temperature for 1 minute. After neutralization, the profiles react with free H2SO4 and Al... 3+ Oxidation treatment was carried out in the solution, with a free sulfuric acid concentration of 180 g / L and Al. 3 The concentration was 20 g / L, and the temperature was 19℃.

[0036] Step 4: Place the profile in a Ni2SO4 solution for a sealing reaction. The Ni2SO4 solution concentration is 1.2 g / L, pH value is 6.0, and solution temperature is 52℃. After the sealing reaction is completed, the finished lawnmower aluminum tube profile is obtained.

[0037] The mechanical properties of the lawnmower aluminum tube profile prepared in this embodiment were tested, and the results were as follows: hardness of 14.8 degrees, tensile strength of 268 MPa, yield strength of 253 MPa, and elongation of 8.2%.

[0038] Example 2

[0039] A manufacturing process for high-performance aluminum tubing profiles for lawnmowers includes the following steps:

[0040] Step 1: Add the following aluminum alloy components by mass percentage to an aluminum alloy extrusion machine for extrusion: Si: 0.53%, Mg: 0.62%, Fe: 0.15%, Zn: 0.05%, Cu: 0.03%, Mn: 0.01%, with the balance being Al. Set the aluminum rod temperature to 487℃, die temperature to 490℃, extrusion barrel temperature to 415℃, and the outlet profile temperature to 530℃. Use forced air cooling at the outlet. Check the aluminum rod temperature every 50 minutes and the outlet profile temperature every 26 minutes. Quench the profile as it is extruded from the aluminum alloy extrusion machine at a cooling rate of 126℃ / min, and control the extrusion speed at 20m / min.

[0041] Step 2: Place the extruded profile into an aging furnace, heat it from room temperature to 180°C and hold it for 6 hours. After removing it from the furnace, cool it with strong air at a wind speed greater than 2500 m³ / h.

[0042] Step 3: The aged profiles are first pickled using an NH4HF2 solution at a concentration of 22 g / L at 50°C for 430 seconds. After pickling, a neutralization treatment is performed: the profiles are placed in a solution of 160 g / L H2SO4 and 30 g / L HNO3 at room temperature for 2 minutes. After neutralization, the profiles react with free H2SO4 and Al... 3+ Oxidation treatment was carried out in the solution, with a free sulfuric acid concentration of 190 g / L and Al. 3+ The concentration was 15 g / L, and the temperature was 18℃.

[0043] Step 4: Place the profile in a Ni2SO4 solution for a sealing reaction. The Ni2SO4 solution concentration is 0.8 g / L, pH value is 5.7, and solution temperature is 59℃. After the sealing reaction is completed, the finished lawnmower aluminum tube profile is obtained.

[0044] The mechanical properties of the lawnmower aluminum tube profile prepared in this embodiment were tested, and the results were as follows: hardness of 14.6 degrees, tensile strength of 266 MPa, yield strength of 251 MPa, and elongation of 8.5%.

[0045] Example 3

[0046] A manufacturing process for high-performance aluminum tubing profiles for lawnmowers includes the following steps:

[0047] Step 1: Add the following aluminum alloy components by mass percentage to an aluminum alloy extrusion machine for extrusion: Si: 0.54%, Mg: 0.63%, Fe: 0.10%, Zn: 0.01%, Cu: 0.07%, Mn: 0.02%, with the balance being Al. Set the aluminum rod temperature to 495℃, die temperature to 473℃, extrusion barrel temperature to 420℃, and the outlet profile temperature to 530℃. Use forced air cooling at the outlet. Check the aluminum rod temperature every 47 minutes and the outlet profile temperature every 32 minutes. Quench the profile as it is extruded from the aluminum alloy extrusion machine at a cooling rate of 120℃ / min, and control the extrusion speed at 19.5 m / min.

[0048] Step 2: Place the extruded profile into an aging furnace, heat it from room temperature to 180℃ and hold it at that temperature for 6 hours. After removing it from the furnace, cool it with strong airflow at a speed greater than 2500 m / s. 3 / h.

[0049] Step 3: The aged profiles are first pickled using an NH4HF2 solution at a concentration of 30 g / L, at 40°C, for 300 seconds. After pickling, a neutralization treatment is performed: the profiles are placed in a solution of 140 g / L H2SO4 and 39 g / L HNO3 at room temperature for 4 minutes. After neutralization, the profiles react with free H2SO4 and Al... 3+ Oxidation treatment was carried out in the solution, with a free sulfuric acid concentration of 150 g / L and Al. 3+ The concentration was 10 g / L, and the temperature was 22℃.

[0050] Step 4: Place the profile in a Ni2SO4 solution for a sealing reaction. The Ni2SO4 solution concentration is 1.1 g / L, pH value is 5.5, and solution temperature is 50℃. After the sealing reaction is completed, the finished lawnmower aluminum tube profile is obtained.

[0051] The mechanical properties of the lawnmower aluminum tube profile prepared in this embodiment were tested, and the results were as follows: hardness of 15.2 degrees, tensile strength of 270 MPa, yield strength of 255 MPa, and elongation of 8.0%.

[0052] Example 4

[0053] A manufacturing process for high-performance aluminum tubing profiles for lawnmowers includes the following steps:

[0054] Step 1: Add the following aluminum alloy components by mass percentage to the aluminum alloy extrusion equipment for extrusion: Si: 0.56%, Mg: 0.64%, Fe: 0.07%, Zn: 0.007%, Cu: 0.05%, Mn: 0.03%, with the balance being Al. Set the aluminum rod temperature to 464℃, die temperature to 475℃, extrusion barrel temperature to 423℃, and the outlet profile temperature to 540℃. Use forced air cooling at the outlet. Check the aluminum rod temperature and the outlet profile temperature every 40 minutes. Quench the profile as it is extruded from the aluminum alloy extrusion equipment at a cooling rate of 100℃ / min, and control the extrusion speed at 21m / min.

[0055] Step 2: Place the extruded profile into an aging furnace, heat it from room temperature to 180°C and hold it for 8 hours. After removing it from the furnace, cool it with strong air at a wind speed greater than 2500 m³ / h.

[0056] Step 3: The aged profiles are first pickled using an NH4HF2 solution at a concentration of 28 g / L, at 40°C, for 300 seconds. After pickling, a neutralization treatment is performed: the profiles are placed in a solution of 170 g / L H2SO4 and 52 g / L HNO3 at room temperature for 5 minutes. After neutralization, the profiles react with free H2SO4 and Al... 3+ Oxidation treatment was carried out in the solution, with a free sulfuric acid concentration of 160 g / L and Al. 3+ The concentration was 8 g / L, and the temperature was 22℃.

[0057] Step 4: Place the profile in a Ni2SO4 solution for a sealing reaction. The Ni2SO4 solution concentration is 0.88 g / L, pH value is 6.0, and solution temperature is 55℃. After the sealing reaction is completed, the finished lawnmower aluminum tube profile is obtained.

[0058] The mechanical properties of the lawnmower aluminum tube profile prepared in this embodiment were tested, and the results were as follows: hardness of 15.0 degrees, tensile strength of 269 MPa, yield strength of 254 MPa, and elongation of 8.3%.

[0059] Example 5

[0060] A manufacturing process for high-performance aluminum tubing profiles for lawnmowers includes the following steps:

[0061] Step 1: Add the following aluminum alloy components by mass percentage to an aluminum alloy extrusion machine for extrusion: Si: 0.51%, Mg: 0.65%, Fe: 0.12%, Zn: 0.02%, Cu: 0.04%, Mn: 0.04%, with the balance being Al. Set the aluminum rod temperature to 500℃, die temperature to 470℃, extrusion barrel temperature to 425℃, and the outlet profile temperature to 525℃. Use forced air cooling at the outlet. Check the aluminum rod temperature every 45 minutes and the outlet profile temperature every 30 minutes. Quench the profile as it is extruded from the aluminum alloy extrusion machine at a cooling rate of 105℃ / min, and control the extrusion speed at 22m / min.

[0062] Step 2: Place the extruded profile into an aging furnace, heat it from room temperature to 180°C and hold it for 7 hours. After removing it from the furnace, cool it with strong air at a wind speed greater than 2500 m³ / h.

[0063] Step 3: The aged profiles are first pickled using an NH4HF2 solution at a concentration of 25 g / L, at a temperature of 48°C, for 400 seconds. After pickling, a neutralization treatment is performed: the profiles are placed in a solution of 150 g / L H2SO4 and 50 g / L HNO3 at room temperature for 3 minutes. After neutralization, the profiles react with free H2SO4 and Al... 3+ The oxidation process was carried out in the solution with a free sulfuric acid concentration of 170 g / L, an Al³⁺ concentration of 12 g / L, and a temperature of 20 °C.

[0064] Step 4: Place the profile in a Ni2SO4 solution for a sealing reaction. The Ni2SO4 solution concentration is 1.0 g / L, pH value is 5.8, and solution temperature is 55℃. After the sealing reaction is completed, the finished lawnmower aluminum tube profile is obtained.

[0065] The mechanical properties of the lawnmower aluminum tube profile prepared in this embodiment were tested, and the results were as follows: hardness of 14.9 degrees, tensile strength of 267 MPa, yield strength of 252 MPa, and elongation of 8.4%.

[0066] Example 6

[0067] A manufacturing process for high-performance aluminum tubing profiles for lawnmowers includes the following steps:

[0068] Step 1: Add the following aluminum alloy components by mass percentage to an aluminum alloy extrusion machine for extrusion: Si: 0.55%, Mg: 0.61%, Fe: 0.08%, Zn: 0.04%, Cu: 0.02%, Mn: 0.03%, with the balance being Al. Set the aluminum rod temperature to 490℃, die temperature to 485℃, extrusion barrel temperature to 418℃, and the outlet profile temperature to 535℃. Use forced air cooling at the outlet. Check the aluminum rod temperature every 42 minutes and the outlet profile temperature every 25 minutes. Quench the profile as it is extruded from the aluminum alloy extrusion machine at a cooling rate of 115℃ / min, and control the extrusion speed at 20.5 m / min.

[0069] Step 2: Place the extruded profile into an aging furnace, heat it from room temperature to 180°C and hold it for 7.5 hours. After removing it from the furnace, cool it with strong air at a wind speed greater than 2500 m³ / h.

[0070] Step 3: The aged profiles are first pickled using an NH4HF2 solution at a concentration of 26 g / L at 52°C for 350 seconds. After pickling, a neutralization treatment is performed: the profiles are placed in a solution of 165 g / L H2SO4 and 60 g / L HNO3 at room temperature for 2.5 minutes. After neutralization, the profiles react with free H2SO4 and Al... 3+ Oxidation treatment was carried out in the solution, with a free sulfuric acid concentration of 185 g / L and Al. 3+ The concentration was 18 g / L, and the temperature was 21℃.

[0071] Step 4: Place the profile in a Ni2SO4 solution for a sealing reaction. The Ni2SO4 solution concentration is 0.9 g / L, pH value is 5.6, and solution temperature is 57℃. After the sealing reaction is completed, the finished lawnmower aluminum tube profile is obtained.

[0072] The mechanical properties of the lawnmower aluminum tube profile prepared in this embodiment were tested, and the results were as follows: hardness of 15.1 degrees, tensile strength of 271 MPa, yield strength of 256 MPa, and elongation of 8.1%.

[0073] Experimental Example

[0074] The products described in Examples 1 to 6 above were subjected to forging, drawing, bending, and elongation tests, and combined with... Figure 1 and Figure 2 As shown, the results are summarized in Table 1.

[0075] Table 1 Mechanical properties of lawnmower aluminum tube profiles prepared in each embodiment

[0076] Example 1 14.8 268 253 8.2 Example 2 14.6 266 251 8.5 Example 3 15.2 270 255 8.0 Example 4 15.0 269 254 8.3 Example 5 14.9 267 252 8.4 Example 6 15.1 271 256 8.1

[0077] As shown in Table 1, the lawnmower aluminum tube profiles prepared using the embodiments of this invention all exhibit good mechanical properties, with a hardness ≥14.5 degrees, tensile strength ≥265 MPa, yield strength ≥250 MPa, and elongation ≥8%. This indicates that by optimizing the alloy composition ratio (Si: 0.51-0.56%, Mg: 0.60-0.65%) and controlling key process parameters such as extrusion temperature (aluminum rod temperature 480-500℃, die temperature 470-490℃, extrusion barrel temperature 415-425℃), quenching cooling rate (100-120℃ / min), and aging regime (180℃ holding for 6-8 hours), high-performance lawnmower aluminum tube profiles can be stably prepared. Furthermore, after oxidation and sealing treatment, the profiles from the embodiments of this invention exhibit uniform color and good surface quality.

[0078] Mg and Si are the main strengthening elements in the aluminum alloy of this invention, forming the strengthening phase Mg₂Si. The higher the Mg content, the greater the amount of Mg₂Si, the greater the heat treatment strengthening effect, and the higher the tensile strength of the profile. However, the deformation resistance also increases, and the plasticity of the alloy decreases somewhat. Magnesium has a significant strengthening effect on aluminum; for every 1% increase in magnesium, the tensile strength increases by approximately 33 MPa. In this invention, the mass percentage of Mg is controlled at 0.60-0.65%, and the mass percentage of Si is controlled at 0.51-0.56%, at which point the mass fraction of Mg₂Si is approximately 0.96%. Experimental verification shows that when the Mg₂Si content is within this range, the profile can simultaneously achieve high tensile strength and good elongation, achieving an optimal balance in comprehensive mechanical properties.

[0079] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

[0080] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A manufacturing process for high-performance lawnmower aluminum tubing, characterized in that, Includes the following steps: Step 1: Place the aluminum alloy containing the following components into an aluminum alloy extrusion machine for extrusion according to the following mass percentages: Si: 0.51-0.56%, Mg: 0.60-0.65%, Fe: ≤0.2%, Zn: ≤0.05%, Cu: ≤0.05%, Mn: ≤0.05%, with the balance being Al; Step 2: Place the extruded profile into an aging furnace, heat to 180℃ and hold for 6-8 hours. After removing from the furnace, cool with strong airflow at a speed greater than 2500 m / s. 3 / h; Step 3: First, pickle the aged profiles, then expose them to free NH4HF2 and Al. 3+ Oxidation treatment is carried out in the solution; Step 4: Place the profile in a Ni2SO4 solution for a sealing reaction.

2. The manufacturing process of the high-performance lawnmower aluminum tube profile according to claim 1, characterized in that, In step one, the aluminum rod temperature of the aluminum alloy extrusion equipment is set to 480-500℃, the die temperature to 470-490℃, the extrusion cylinder temperature to 415-425℃, and the outlet profile temperature to ≥525℃, with strong air cooling at the outlet.

3. The manufacturing process of the high-performance lawnmower aluminum tube profile according to claim 2, characterized in that, In step one, the temperature of the aluminum rod is checked every 40-50 minutes, and the temperature of the discharge port profile is checked every 20-40 minutes.

4. The manufacturing process of the high-performance lawnmower aluminum tube profile according to claim 1, characterized in that, Between step one and step two, there is a quenching process, which is carried out when the profile is extruded from the aluminum alloy extrusion equipment. The cooling rate is 100-120℃ / min, and the profile extrusion speed is controlled at 19-22m / min.

5. The manufacturing process of the high-performance lawnmower aluminum tube profile according to claim 1, characterized in that, In step two, the temperature is raised from room temperature to 180°C and held for 6-9 hours.

6. The manufacturing process of the high-performance lawnmower aluminum tube profile according to claim 1, characterized in that, In step three, the pickling solution is an NH4HF2 solution with a concentration of 20-28 g / L, a temperature of 44-55℃, and an oxidation time of 300-500 s.

7. The manufacturing process of the high-performance lawnmower aluminum tube profile according to claim 1, characterized in that, In step three, the profile is first neutralized after pickling and then oxidized. The neutralization process is as follows: the profile is placed in a solution of H2SO4 with a concentration of 140-180 g / L and HNO3 with a concentration of 30-70 g / L at room temperature and reacted for 1-5 minutes.

8. The manufacturing process of the high-performance lawnmower aluminum tube profile according to claim 1, characterized in that, The concentration of free sulfuric acid mentioned in step three is 150-190 g / L, Al 3+ The concentration is <20g / L, and the temperature is 18-22℃.

9. The manufacturing process of the high-performance lawnmower aluminum tube profile according to claim 1, characterized in that, Between steps three and four, there is an oil removal process: add an oil remover and treat at room temperature for 100-300 seconds.

10. The manufacturing process of the high-performance lawnmower aluminum tube profile according to claim 1, characterized in that, The concentration of the Ni2SO4 solution in step four is 0.8-1.2 g / L, the pH value is 5.5-6.0, and the solution temperature is 50-59℃.

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