Quenching method of high-performance thin-wall multi-cavity aluminum alloy profile

Abstract

The invention discloses a quenching method for a high-performance thin-wall multi-cavity aluminum alloy profile, and belongs to the technical field of aluminum alloy machining. The quenching method is carried out in a quenching tank, and at least two groups of nozzles are arranged on each of two side walls and the bottom surface, extending in the length direction of the aluminum alloy section, of the quenching tank; and during quenching, the water pressure of cooling water sprayed out of the nozzle is larger than or equal to 1000 kPa, and the flow is larger than or equal to 16 L / min. According to the quenching method provided by the invention, on the premise of ensuring that the product does not deform, the mechanical property of the aged product can be ensured at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum alloy processing, and in particular relates to a super-strong quenching method for a high-performance thin-wall multi-cavity aluminum alloy profile. Background Art

[0002] Thin-walled multi-cavity aluminum alloy profiles have excellent thermal insulation performance, good sound insulation effect, and light weight but stable structure. They are widely used in construction, transportation, aerospace and other fields. Due to the characteristics of thin walls and multiple cavities, this type of product is difficult to manufacture and has high costs. In the quenching process, since this type of aluminum alloy profile has many cavities and there are differences in wall thickness at different positions, when using traditional aluminum alloy profile quenching methods, there are problems such as difficulty in cooling the inner cavity, incomplete quenching of the inner cavity, high distortion rate of the profile, and unstable performance of the profile after quenching, which in turn affect product quality and increase production costs. In response to the above problems, quenching methods with low cooling efficiency such as wind and water mist are currently used to reduce product deformation, waves and other defects. For example, a thin-walled multi-cavity profile extrusion process disclosed in the Chinese invention patent with application number 201910509760.8 quenches the extruded multi-cavity aluminum alloy profile by air cooling quenching or water mist quenching. However, since it is impossible to fix the supersaturated solid solution in a high temperature state to room temperature in a short period of time, the use of this type of quenching method will affect the mechanical properties of the product after aging. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a quenching method suitable for thin-walled multi-cavity aluminum alloy profiles that can ensure the mechanical properties of the product after aging while preventing defects such as product deformation and waves, so as to prepare a high-performance thin-walled multi-cavity aluminum alloy profile.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a quenching method for high-performance thin-walled multi-cavity aluminum alloy profiles, which is carried out in a quenching tank, wherein the quenching tank is provided with at least two groups of nozzles on the two side walls and the bottom surface extending along the length direction of the aluminum alloy profile; during quenching, the water pressure of the cooling water sprayed from the nozzle is ≥1000kPa, and the flow rate is ≥16L / min.

[0005] The beneficial effect of the present invention is that the quenching method provided by the present invention can improve the supersaturated solid solution degree of the aluminum alloy profile during quenching by changing the distribution of the nozzles in the quenching tank and greatly increasing the water pressure and flow rate of the cooling water sprayed from the nozzles, thereby ensuring the mechanical properties of the product after aging while ensuring that the product does not deform. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a structural schematic diagram of the nozzle distribution in the quenching tank according to a specific embodiment of the present invention; Figure 2 A front cross-sectional view of a nozzle according to a specific embodiment of the present invention; Figure 3 A top view of a nozzle according to a specific embodiment of the present invention; Description of labels: 1. Thin-walled multi-cavity aluminum alloy profiles; 2. Nozzle; 21. Water spray hole. DETAILED DESCRIPTION

[0007] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0008] Please refer to Figure 1 A quenching method for a high-performance thin-walled multi-cavity aluminum alloy profile is carried out in a quenching tank, wherein at least two sets of nozzles are respectively provided on two side walls and a bottom surface extending along the length direction of the aluminum alloy profile; during quenching, the water pressure of the cooling water sprayed from the nozzle is ≥1000 kPa, and the flow rate is ≥16 L / min.

[0009] From the above description, it can be seen that the beneficial effects of the present invention are: the quenching method provided by the present invention changes the distribution of the nozzles in the quenching tank, and at the same time greatly increases the water pressure of the cooling water sprayed from the nozzles to more than 1000 kPa, and greatly increases the flow rate of the cooling water sprayed from the nozzles to 16 L / min, so that the cooling rate can reach more than 100 ℃ / s, and can form a uniform coverage of the product axially to achieve uniform cooling of multiple cavities, so that the supersaturated solid solution degree of the aluminum alloy profile during quenching is improved, and then the product after aging has better performance in mechanical properties, which is more than 10% higher than the traditional cooling method, and the product will not have the problem of distortion and deformation.

[0010] Furthermore, the water pressure is 1000~1100 kPa.

[0011] Furthermore, the flow rate is 16-18 L / min, preferably 17.5 L / min.

[0012] From the above description, it can be seen that controlling the water pressure and flow rate within the above range can ensure uniform and rapid cooling of thin-walled multi-cavity aluminum alloy profiles without causing problems such as cracking, deformation, uneven hardness or insufficient hardness due to excessive cooling.

[0013] Furthermore, the distance between each group of nozzles is 80-120 mm, such as 90 mm, 100 mm or 110 mm.

[0014] Furthermore, each group of nozzles located on the side wall includes three nozzles arranged in sequence along the height (thickness) direction of the thin-walled multi-cavity aluminum alloy profile; each group of nozzles located on the bottom surface includes three nozzles arranged in sequence along the width direction of the thin-walled multi-cavity aluminum alloy profile.

[0015] Furthermore, the thin-walled multi-cavity aluminum alloy profile 1 is located within the spray range of the nozzle 2. The horizontal plane of the topmost nozzle of each group of nozzles located on the side wall is higher than the horizontal plane of the top surface of the thin-walled multi-cavity aluminum alloy profile.

[0016] From the above description, we can see that Figure 1 The cross-sectional view or end view of the aluminum alloy profile is shown in FIG. By arranging the nozzles in the above manner, it is not necessary to arrange the nozzles above the thin-walled multi-cavity aluminum alloy profile, which can reduce the number of nozzles used while ensuring sufficient and rapid cooling.

[0017] Please refer to Figure 2 and 3 Furthermore, the spray shape of the nozzle 2 is fan-shaped, and the spray angle is 80°. The nozzle 2 includes a water spray hole 21, which is a flat hole, and a water guide surface is provided in the water outlet direction of the water spray hole 21. The spray shape of the water spray hole is fan-shaped, and the spray angle is 80°. The application of this nozzle helps to achieve high-pressure and high-flow spray, while improving the uniformity of cooling and avoiding the phenomenon of uneven hot and cold inside and outside.

[0018] Furthermore, the wall thickness of the thin-walled multi-cavity aluminum alloy profile is ≥1.8 mm.

[0019] Furthermore, the distance between the nozzle and the outer wall of the thin-walled multi-cavity aluminum alloy profile is 80-120 mm. Control of this distance is conducive to achieving rapid and stable cooling.

[0020] Furthermore, the transmission speed of the thin-walled multi-cavity aluminum alloy profile 1 in the quenching tank is 10-13 m / min, such as 10 m / min, 10.5 m / min, 11 m / min, 11.5 m / min, 12 m / min, 12.5 m / min, and 13 m / min.

[0021] From the above description, it can be seen that thin-walled multi-cavity aluminum alloy profiles are quenched and cooled while being extruded. Controlling the transmission speed at 10~13m / min during the cooling process can ensure sufficient cooling. It should not be too fast or too slow, which will affect the mechanical properties of the product.

[0022] Please refer to Figures 1 to 3 , Embodiment 1: A high-performance thin-walled multi-cavity aluminum alloy profile quenching method is carried out in a quenching tank. During quenching, the thin-walled multi-cavity aluminum alloy profile is extruded and quenched and cooled at the same time. The transmission speed of the thin-walled multi-cavity aluminum alloy profile in the quenching tank is 12 m / min. The wall thickness of the thin-walled multi-cavity aluminum alloy profile is 1.8 mm. The two side walls of the quenching tank extending along the length direction of the aluminum alloy profile are each provided with 20 groups of nozzles; the distance between the groups is 100 mm; each group of nozzles located on the side wall includes three nozzles arranged in sequence along the height direction of the thin-walled multi-cavity aluminum alloy profile; the horizontal plane of the topmost nozzle of each group of nozzles located on the side wall is higher than the horizontal plane of the top surface of the thin-walled multi-cavity aluminum alloy profile; There are 20 groups of nozzles on the bottom surface of the quenching tank. Each group of nozzles on the bottom surface includes three nozzles arranged in sequence along the width direction of the thin-walled multi-cavity aluminum alloy profile. The distance between the groups is 100 mm. During quenching, the cooling water sprayed from the nozzle has a water pressure of 1000 kPa and a flow rate of 17.5 L / min. The spray shape of the nozzle is fan-shaped and the spray angle is 80°.

[0023] Embodiment 2: The difference between the second embodiment and the first embodiment is that the number of groups of nozzles arranged on the side wall and the bottom surface is 30 each, the water pressure of the cooling water sprayed from the nozzles is 1100 kPa, and the wall thickness of the cavity aluminum alloy profile is 2 mm.

[0024] Comparative Example 1: The difference between Comparative Example 1 and Example 1 is that the water pressure of the cooling water sprayed from the nozzle is 600 kPa, the flow rate is 6 L / min, the spray shape of the nozzle is fan-shaped, and the spray angle is 65°; the top surface of the quenching tank is also provided with nozzles corresponding to the bottom surface.

[0025] The products obtained in Example 1 and Comparative Example 1 were tested, and the results are shown in Table 1.

[0026] Table 1

[0027] In summary, the quenching method provided by the present invention cools quickly and evenly, and will not cause cracking or deformation of the product. At the same time, it ensures the mechanical properties of the product after aging, and can prepare high-performance thin-walled multi-cavity aluminum alloy profiles. Compared with the use of other conventional quenching methods, the quality consistency of the same batch of products is significantly improved.

[0028] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A quenching method for high-performance thin-walled multi-cavity aluminum alloy profiles, characterized in that: The process is carried out in a quenching tank, wherein at least two groups of nozzles are respectively arranged on the two side walls and the bottom surface extending along the length direction of the aluminum alloy profile; during quenching, the water pressure of the cooling water sprayed from the nozzles is ≥1000 kPa, and the flow rate is ≥16 L / min.

2. The quenching method according to claim 1, characterized in that: The water pressure is 1000~1100 kPa.

3. The quenching method according to claim 1, characterized in that: The flow rate is 16~18L / min.

4. The quenching method according to claim 1, characterized in that: The distance between each set of nozzles is 80~120mm.

5. The quenching method according to claim 1, characterized in that: Each group of nozzles located on the side wall includes three nozzles arranged in sequence along the height direction of the thin-walled multi-cavity aluminum alloy profile; each group of nozzles located on the bottom surface includes three nozzles arranged in sequence along the width direction of the thin-walled multi-cavity aluminum alloy profile.

6. The quenching method according to claim 5, characterized in that: The horizontal plane at which the topmost nozzle of each group of nozzles located on the side wall is located is higher than the horizontal plane at which the top surface of the thin-walled multi-cavity aluminum alloy profile is located.

7. The quenching method according to claim 1, characterized in that: The spray shape sprayed by the nozzle is fan-shaped, and the spray angle is 80°.

8. The quenching method according to claim 1, characterized in that: The wall thickness of thin-walled multi-cavity aluminum alloy profiles is ≥1.8mm.

9. The quenching method according to claim 1, characterized in that: The distance between the nozzle and the outer wall of the thin-walled multi-cavity aluminum alloy profile is 80-120 mm.

10. The quenching method according to claim 1, characterized in that: The transmission speed of thin-walled multi-cavity aluminum alloy profiles in the quenching tank is 10~13m / min.

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