Production process of 6063T4 twelve-cavity motor shell aluminum profile

Abstract

The invention discloses a production process of a 6063T4 twelve-cavity motor shell aluminum profile, and belongs to the technical field of aluminum alloy preparation. An electromagnetic field is introduced in the casting process, grain structures are effectively refined, uniformity is improved, sectional extrusion is combined, the extrusion speed can be more accurately controlled, metal flowing can be effectively balanced, the defect risks of twisting, deformation, cracks and the like of a profile are reduced, complete filling and size precision of a complex section shape are guaranteed, and the production efficiency is improved. Then through a mixed quenching system of strong wind pre-cooling, aerial fog treatment and a water curtain compensation area, the strong wind pre-cooling avoids thermal stress caused by overlarge temperature difference due to sudden drop; uniform strong cooling is realized through aerial fog treatment; the water curtain compensation needle is used for strengthening fixed points of a thick area, quenching blind spots are eliminated, the whole section of the profile can quickly and uniformly pass through a critical temperature interval, the mechanical property of the profile can be guaranteed, warping, deformation and internal stress caused by uneven cooling are effectively reduced, the yield of production can be increased, and the production cost can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aluminum alloy profiles, in particular to a production process of a 6063T4 twelve-cavity motor shell aluminum profile. BACKGROUND

[0002] Aluminum profiles have been widely used in the fields of power electronics, automobile manufacturing, aerospace, etc. due to their small specific gravity, high strength, good electrical and thermal conductivity, corrosion resistance, and easy processing. Among them, 6063 aluminum alloy has become a material for producing various industrial profiles, especially for motor shell, due to its good extrudability, anodic oxidation effect, and comprehensive mechanical properties.

[0003] The motor shell, as a key structural component of the motor, plays a core role in fixing the core and stator assembly and bearing the heat dissipation of the motor. With the continuous improvement of the performance requirements of industrial development on the motor, high power density, miniaturization, and light weight have become the mainstream trend. This requires the motor shell aluminum profile to have more optimal heat dissipation performance while ensuring sufficient structural strength and assembly precision, such as having more heat dissipation fins and more complex air duct structures. Therefore, the demand for complex cross-section aluminum profiles with multiple cavities and thin walls is increasing. The twelve-cavity motor shell profile is a typical representative designed to meet the high-efficiency heat dissipation of high-power motors, which contains multiple independent cooling air duct cavities, greatly increasing the heat dissipation area. However, the production of complex cross-section aluminum profiles with multiple cavities, thin walls, and wide widths faces extremely severe challenges. The traditional production process cannot meet the technical requirements, which are specifically reflected in the following aspects: the cross-section of the 6063T4 twelve-cavity motor shell aluminum profile is huge, and the wall thickness difference is obvious. Due to the uneven flow speed of metal through the multi-cavity die, the flow speed of metal in each part of the profile is different, resulting in inconsistent grain size and texture distribution, which not only affects the surface quality and dimensional accuracy of the profile, but also causes differences in mechanical properties between the cavities. In addition, the factors such as large extrusion force, slow speed, high scrap rate (such as waves, twists, size out-of-tolerance, uneven performance, etc.), and mutual superposition of other factors result in low production efficiency and low pass rate, high manufacturing cost, and serious restriction on large-scale popularization and application. SUMMARY

[0004] Therefore, in order to solve one of the above problems, the present application provides a production process of a 6063T4 twelve-cavity motor shell aluminum profile, and the specific technical solutions are as follows:

[0005] A production process of a 6063T4 twelve-cavity motor shell aluminum profile, the production process comprising the following steps:

[0006] Adding the proportioned raw materials to a melting furnace for melting treatment to obtain an aluminum alloy liquid aluminum alloy melt;

[0007] The aluminum alloy melt is subjected to refining treatment, degassing treatment, filtering treatment and casting treatment to obtain an aluminum bar;

[0008] The aluminum bar is subjected to heating treatment, then extrusion treatment, quenching, straightening treatment, sizing and sawing to obtain a 6063T4 twelve-cavity motor shell aluminum profile;

[0009] The extrusion treatment adopts a segmented control mode, including an initial stage, a filling stage and a discharging stage, the extrusion speed of the initial stage is 0.6 m / min to 1.0 m / min, the extrusion speed of the filling stage is 1.8 m / min to 3.5 m / min, and the extrusion speed of the discharging stage is 1.8 m / min to 2.0 m / min,

[0010] The quenching adopts a water cooling and air cooling hybrid system, the hybrid system includes a strong air pre-cooling zone, an air mist treatment zone and a water curtain compensation zone, the strong air pre-cooling zone adopts a strong air nozzle, the air pressure is 15 kPa to 20 kPa, the air temperature is 45℃ to 80℃, to avoid the surface temperature of the profile from dropping sharply and forming a large temperature difference in the core, and to reduce thermal stress; the air mist treatment zone adopts a plurality of nozzles surrounding the profile, the atomized water is mixed with compressed air and uniformly sprayed onto the surface of the profile, the water pressure is 0.5 MPa to 0.8 MPa, and the air pressure is 0.4 MPa to 0.5 MPa; the water curtain compensation zone adopts a water curtain nozzle that can be angularly flipped to perform spot intensive cooling on the thicker areas of the profile, to eliminate quenching blind spots and ensure uniform cooling of the entire cross section; after quenching, the temperature of the profile should be reduced to <250℃.

[0011] Further, the raw material includes the following components by mass percentage:

[0012] Si 0.42% to 0.48%, Mg 0.52% to 0.56%, Fe 0.05% to 0.15%, Cu 0.01% to 0.05%, Zn 0.01% to 0.05%, Ti 0.01% to 0.05%, Cr 0.01% to 0.02%, Mn 0.01% to 0.05%, single impurity ≤0.05%, total impurities ≤0.12%, and Al balance.

[0013] Further, the temperature of the smelting treatment is 720℃ to 740℃, and the time is 4h to 6h.

[0014] Further, the refining treatment is under a negative pressure atmosphere, and a refining agent is added, the number of refining treatments is not less than two, the time of each refining treatment is 15min to 20min, and the temperature of the refining treatment is 720 to 740℃.

[0015] Further, the addition amount of the refining agent accounts for 2% to 5% of the mass of the aluminum alloy melt.

[0016] Further, the degassing treatment adopts argon, and the amount is 3m 3 / h~5m 3 / h, the rotating speed of the rotor is 500r / min~600r / min, the working pressure of the argon is 0.2MPa~0.3MPa, and the hydrogen content is controlled to be less than or equal to 0.15mL / 100g Al.

[0017] Further, the filtering treatment adopts online filtering by using an online filtering device, and double-stage online filtering is performed by using 30PPi~50PPi and 50PPi~70PPi ceramic foam plates.

[0018] Further, the temperature of the casting treatment is 710℃~720℃, and an electromagnetic field is introduced in the casting process, the frequency of the electromagnetic field is 10Hz~12Hz, and the magnetic field strength is 10000A / m~12000A / m.

[0019] Further, in the aluminum rod heating treatment, the temperature of the mold heating is 470℃~500℃, the time of the mold heating is 9h~24h, and the temperature of the aluminum rod entering the machine is 470℃~490℃.

[0020] Further, the stretching amount of the straightening treatment is 0.8%~1.5%.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] 1. The present application reduces the impurity and gas content in the aluminum alloy melt by optimizing the composition of the aluminum alloy and through refining treatment, degassing treatment and double-stage online filtering, reduces the defects such as porosity and pores of the profile, and effectively refines the grain structure by introducing a specific parameter electromagnetic field in the subsequent casting process, improves the uniformity of the composition, and helps to obtain high-quality and performance-uniform profiles in subsequent extrusion.

[0023] 2. The present application can more accurately control the extrusion speed by optimizing the production process and using the segmented extrusion method, can effectively balance the metal flow, reduce the risk of defects such as twisting, deformation and cracking of the profile, and ensure the complete filling and size accuracy of the complex cross-sectional shape.

[0024] 3.The mixed quenching system of strong wind pre-cooling + air mist treatment + water curtain compensation zone, through the stage-by-stage and multi-mode cooling mode, and strictly controlling the air pressure, air temperature, water pressure and air pressure, realizes the rapid and uniform cooling of the complex multi-cavity profile, wherein the strong wind pre-cooling avoids the thermal stress caused by the too large sudden temperature difference; the air mist treatment realizes the uniform and strong cooling; the water curtain compensation is used for the fixed-point strengthening of the thick area, eliminates the quenching blind spot, makes the whole cross section of the profile quickly and uniformly pass through the critical temperature interval, helps to ensure the mechanical properties of the profile, effectively reduces the warping, deformation and internal stress caused by uneven cooling, and helps to improve the qualified rate of production and reduce the production cost. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application is further described in detail below in combination with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the protection scope of the present application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing specific embodiments only and is not intended to be limiting of the present application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0027] The production process of the 6063T4 twelve-cavity motor shell aluminum profile in an embodiment of the present application comprises the following steps:

[0028] The well-proportioned raw materials are added to a smelting furnace for smelting treatment to obtain an aluminum alloy liquid aluminum alloy melt;

[0029] The aluminum alloy melt is subjected to refining treatment, degassing treatment, filtration treatment and casting treatment to obtain an aluminum bar;

[0030] The aluminum bar is subjected to heating treatment, then extrusion treatment, quenching, straightening treatment, and then fixed-length sawing to obtain the 6063T4 twelve-cavity motor shell aluminum profile;

[0031] The extrusion treatment adopts a segmented control mode, including an initial stage, a filling stage and a discharging stage, the extrusion speed of the initial stage is 0.6 m / min to 1.0 m / min, the extrusion speed of the filling stage is 1.8 m / min to 3.5 m / min, and the extrusion speed of the discharging stage is 1.8 m / min to 2.0 m / min;

[0032] The quenching adopts a mixed system of water cooling and air cooling, the mixed system comprises a strong air pre-cooling area, an air mist treatment area and a water curtain compensation area, the strong air pre-cooling area adopts a strong air nozzle, the wind pressure is 15kPa-20kPa, the wind temperature is 45℃-80℃, the surface temperature of the profile is prevented from suddenly dropping and a great temperature difference is prevented from being formed in the core, and the thermal stress is reduced; the air mist treatment area adopts a plurality of nozzles surrounding the profile, the atomized water is mixed with compressed air, and then is uniformly sprayed to the surface of the profile, the water pressure is 0.5MPa-0.8MPa, and the air pressure is 0.4MPa-0.5MPa; the water curtain compensation area adopts a water curtain nozzle which can be angularly turned over to perform fixed-point intensive cooling on the area of the profile which is relatively thick, blind spots of quenching are eliminated, and uniform cooling of the whole section is ensured; after the quenching is finished, the temperature of the profile should be reduced to <250℃.

[0033] In one of the embodiments, the raw material comprises the following components in mass percentage:

[0034] Si 0.42%-0.48%, Mg 0.52%-0.56%, Fe 0.05%-0.15%, Cu 0.01%-0.05%, Zn 0.01%-0.05%, Ti 0.01%-0.05%, Cr 0.01%-0.02%, Mn 0.01%-0.05%, single impurity ≤0.05%, total impurities ≤0.12%, Al balance.

[0035] In one of the embodiments, the temperature of the smelting treatment is 720℃-740℃, and the time is 4h-6h.

[0036] In one of the embodiments, the refining treatment is: under a negative pressure atmosphere, a refining agent is added, the number of times of the refining treatment is not less than two, the time of each refining treatment is 15min-20min, and the temperature of the refining treatment is 720-740℃.

[0037] In one of the embodiments, the adding amount of the refining agent accounts for 2%-5% of the mass of the aluminum alloy melt.

[0038] In one of the embodiments, the refining agent is hexachloroethane.

[0039] In one of the embodiments, the degassing treatment adopts argon, the amount of the argon is 3m 3 / h-5m 3 / h, the rotating speed of the rotor is 500r / min-600r / min, the working pressure of the argon is 0.2MPa-0.3MPa, and the hydrogen content is controlled to be ≤0.15mL / 100gAl.

[0040] In one of the embodiments, the filtering treatment adopts an online filtering device to perform online filtering, and adopts a double-stage online filtering by using 30PPi-50PPi and 50PPi-70PPi ceramic foam plates.

[0041] In one of the embodiments, the temperature of the casting treatment is 710-720 DEG C, and an electromagnetic field is introduced during the casting process, the frequency of the electromagnetic field is 10-12 Hz, and the magnetic field strength is 10000-12000 A / m.

[0042] In one of the embodiments, the temperature of the mold heating in the aluminum bar heating treatment is 470-500 DEG C, the time of the mold heating is 9-24 h, and the temperature of the aluminum bar entering the machine is 470-490 DEG C.

[0043] In one of the embodiments, the stretching amount of the straightening treatment is 0.8-1.5%.

[0044] The profile obtained in the above scheme has excellent apparent quality, excellent mechanical properties and high qualified rate, and the overall production efficiency is high, which is helpful for large-scale production.

[0045] The embodiments of the application will be described in detail below with specific examples.

[0046] Example 1:

[0047] A raw material of a 6063T4 twelve-cavity motor shell aluminum profile includes the following components in mass percentage: Si 0.46%, Mg 0.52%, Fe 0.05%, Cu 0.01%, Zn 0.02%, Ti 0.03%, Cr 0.01%, Mn 0.01%, single impurity ≤0.05%, total impurities ≤0.12%, and Al balance.

[0048] A production process of a 6063T4 twelve-cavity motor shell aluminum profile, the production process includes the following steps:

[0049] The proportioned raw material is added to a smelting furnace, and smelting treatment is performed at a temperature of 720 DEG C for 5 h to obtain an aluminum alloy liquid aluminum alloy melt;

[0050] The aluminum alloy melt is added with 4% of hexachloroethane based on the mass of the aluminum alloy melt under a negative pressure atmosphere, and refining treatment is performed, and the number of times of the refining treatment is not less than two, the time of each refining treatment is 15 min, the temperature of the refining treatment is 720 DEG C, then degassing treatment is performed, and the degassing treatment adopts argon, and the amount is 3m 3The aluminum rod is obtained by the following steps: the aluminum alloy melt is prepared by adding the raw materials into a smelting furnace and smelting at a temperature of 720 ℃ for 5 h; the aluminum alloy melt is treated by a double-stage on-line filtering device, wherein the double-stage on-line filtering device comprises a 45PPi foam ceramic plate and a 70PPi foam ceramic plate; the aluminum alloy melt is cast at a temperature of 720 ℃; and an electromagnetic field is introduced in the casting process, wherein the electromagnetic field has a frequency of 10 Hz and a magnetic field strength of 10000 A / m.

[0051] The aluminum rod is heated and treated, and the temperature of mold heating in the heating and treatment of the aluminum rod is 470 ℃, the time of mold heating is 10 h, and the temperature of the aluminum rod in the machine is 480 ℃; then the aluminum rod is extruded and treated, and the extrusion and treatment is in a segmented control mode, including an initial stage, a filling stage and a discharging stage, the extrusion speed of the initial stage is 0.6 m / min, the extrusion speed of the filling stage is 2.5 m / min, and the extrusion speed of the discharging stage is 1.8 m / min; then the aluminum rod is quenched, and the quenching adopts a mixed system of water cooling and air cooling, the mixed system comprises a strong wind pre-cooling area, an air mist treatment area and a water curtain compensation area, the strong wind pre-cooling area adopts a strong wind nozzle, the wind pressure is 15 kPa, the wind temperature is 45 ℃, the surface temperature of the profile is prevented from being suddenly reduced, a great temperature difference between the core and the surface is avoided, and thermal stress is reduced; the air mist treatment area adopts a plurality of nozzles surrounding the profile, the atomized water and compressed air are mixed and uniformly sprayed to the surface of the profile, the water pressure is 0.5 MPa, and the air pressure is 0.5 MPa; the water curtain compensation area adopts a water curtain nozzle which can be angularly turned to perform spot strengthening cooling on the thicker area of the profile, blind spots in quenching are eliminated, and the cooling of the whole cross section is ensured to be uniform; after the quenching is completed, the temperature of the profile should be reduced to < 250 ℃.

[0052] The profile is straightened and treated, the stretching amount of the straightening and treatment is 1.0%, and then the profile is cut to a specified size to obtain the 6063T4 twelve-cavity motor shell aluminum profile.

[0053] Embodiment 2

[0054] The raw material of the 6063T4 twelve-cavity motor shell aluminum profile comprises the following components in mass percentage: Si 0.46%, Mg 0.54%, Fe 0.08%, Cu 0.03%, Zn 0.03%, Ti 0.03%, Cr 0.02%, Mn 0.02%, single impurity ≤0.05%, total impurities ≤0.12%, and Al balance.

[0055] A production process of a 6063T4 twelve-cavity motor shell aluminum profile, the production process comprises the following steps:

[0056] The raw materials are added into a smelting furnace, and smelting treatment is performed at a temperature of 720 ℃ for 5 h to obtain an aluminum alloy liquid aluminum alloy melt.

[0057] The aluminum alloy melt is added with 5% of hexachloroethane by mass of the aluminum alloy melt under a negative pressure atmosphere, refined for not less than two times, each time for 20 min, at a temperature of 725℃, and then degassed, using argon, at a dosage of 4m 3 / h, the rotor rotating at 500r / min, the working pressure of argon being 0.3MPa, the hydrogen content being controlled to be ≤0.15mL / 100g Al, and then filtered on line using a 45PPi and 70PPi double-stage on-line filtering foam ceramic plate, and cast at a temperature of 720℃, with an electromagnetic field introduced during casting, the frequency of the electromagnetic field being 12Hz, and the magnetic field strength being 12000A / m, to obtain an aluminum bar;

[0058] The aluminum bar is heated, the mold being heated at a temperature of 480℃ for 10h, and the aluminum bar being heated at a temperature of 490℃; then extruded, the extrusion being controlled in stages, including an initial stage, a filling stage, and a discharging stage, the extrusion speed of the initial stage being 0.8m / min, the extrusion speed of the filling stage being 2.8m / min, and the extrusion speed of the discharging stage being 1.9m / min; then quenched, the quenching being performed using a water cooling and air cooling hybrid system, the hybrid system including a strong air pre-cooling zone, a gas mist treatment zone, and a water curtain compensation zone, the strong air pre-cooling zone using a strong air nozzle, the air pressure being 16kPa, and the air temperature being 45℃, to avoid a sudden drop in the surface temperature of the profile and a large temperature difference between the core and the surface, and to reduce thermal stress, the gas mist treatment zone using a plurality of nozzles surrounding the profile, the atomized water being mixed with compressed air and then sprayed uniformly onto the surface of the profile, the water pressure being 0.6Mpa, and the air pressure being 0.5Mpa, and the water curtain compensation zone using a water curtain nozzle that can be turned at an angle to perform spot strengthening cooling on the thicker areas of the profile, to eliminate quenching blind spots and ensure uniform cooling of the entire cross section; after quenching, the temperature of the profile should be reduced to <250℃;

[0059] The profile is straightened, the straightening being performed at a stretching amount of 1.0%, and then cut to size, to obtain a 6063T4 twelve-cavity motor shell aluminum profile.

[0060] Example 3:

[0061] A raw material for a 6063T4 twelve-cavity motor shell aluminum profile includes the following components by mass percentage: Si 0.48%, Mg 0.56%, Fe 0.12%, Cu 0.03%, Zn 0.03%, Ti 0.04%, Cr 0.01%, Mn 0.03%, single impurity ≤0.05%, total impurities ≤0.12%, and Al the balance.

[0062] A production process of a 6063T4 twelve-cavity motor shell aluminum profile, the production process comprising the following steps:

[0063] Adding the proportioned raw materials into a smelting furnace, and performing smelting treatment for 6h under the condition that the temperature is 720℃, to obtain an aluminum alloy liquid aluminum alloy melt;

[0064] Adding 4% of hexachloroethane of the mass of the aluminum alloy melt into the aluminum alloy melt under a negative pressure atmosphere, performing refining treatment, and the number of times of the refining treatment is not less than two, the time of each refining treatment is 20min, the temperature of the refining treatment is 720℃, then performing degassing treatment, and the degassing treatment adopts argon, the amount is 5m 3 / h, the rotating speed of the rotor is 500r / min, the working pressure of the argon is 0.2MPa, the hydrogen content is controlled to be ≤0.15mL / 100g Al, then performing online filtering by using an online filtering device, performing double-stage online filtering by using 45PPi and 70PPi foam ceramic plates, and performing casting treatment under the condition that the temperature is 720℃, and introducing an electromagnetic field in the casting process, the frequency of the electromagnetic field is 12Hz, the magnetic field strength is 11000A / m, to obtain an aluminum bar;

[0065] Performing heating treatment on the aluminum bar, and the temperature of mold heating in the heating treatment of the aluminum bar is 480℃, the time of mold heating is 9h, and the temperature of the aluminum bar entering the machine is 490℃; then performing extrusion treatment by using a segmented control mode, including an initial stage, a filling stage and a discharging stage, the extrusion speed of the initial stage is 1.0m / min, the extrusion speed of the filling stage is 3.2m / min, and the extrusion speed of the discharging stage is 2.0m / min; then quenching by using a water cooling and air cooling mixed system, the mixed system comprising a strong wind pre-cooling area, an air mist treatment area and a water curtain compensation area, the strong wind pre-cooling area: using a strong wind nozzle, the wind pressure is 20kPa, the wind temperature is 45℃, to avoid the surface temperature of the profile dropping suddenly and forming a great temperature difference in the core, and to reduce thermal stress; the air mist treatment area: using a plurality of nozzles surrounding the profile, mixing the atomized water and compressed air, and uniformly spraying to the surface of the profile, the water pressure is 0.8Mpa, and the air pressure is 0.4Mpa; the water curtain compensation area: using a water curtain nozzle which can be angularly turned to perform fixed-point intensive cooling on the thicker area of the profile, to eliminate quenching blind spots and ensure uniform cooling of the whole cross section; after the quenching is completed, the temperature of the profile should be reduced to <250℃;

[0066] Performing straightening treatment on the profile, the stretching amount of the straightening treatment is 1.0%, then performing fixed-length sawing, to obtain the 6063T4 twelve-cavity motor shell aluminum profile.

[0067] Comparative Example 1:

[0068] Comparative Example 1 is different from Example 3 in that no electromagnetic field is added in Comparative Example 1, and the rest is the same as Example 3.

[0069] Comparative Example 2:

[0070] Comparative Example 2 is different from Example 3 in that the extrusion speed of the extrusion treatment in Comparative Example 2 is 3.0 m / min, and the rest is the same as Example 3.

[0071] Comparative Example 3:

[0072] Comparative Example 3 is different from Example 3 in that the extrusion speed of the extrusion treatment in Comparative Example 3 is 5 m / min, and the rest is the same as Example 3.

[0073] Comparative Example 4:

[0074] Comparative Example 4 is different from Example 3 in that a conventional single air cooling is used in Comparative Example 4, and the rest is the same as Example 3.

[0075] Comparative Example 5:

[0076] Comparative Example 5 is different from Example 3 in that a conventional single water cooling is used in Comparative Example 5, and the rest is the same as Example 3.

[0077] Comparative Example 6:

[0078] Comparative Example 6 is different from Example 3 in that no air mist treatment zone and water curtain compensation zone are used in Comparative Example 6, and the rest is the same as Example 3.

[0079] I. According to the production processes of Examples 1-3 and the production processes of Comparative Examples 1-6, 100 test products are produced in each group, and the qualified rate of each group is recorded. The results are shown in Table 1 below.

[0080] Table 1: Qualified rate

[0081] Group Pass rate Example 1 100 Example 2 100 Example 3 100 Comparative Example 1 99 Comparative Example 2 95 Comparative Example 3 90 Comparative Example 4 89 Comparative Example 5 90 Comparative Example 6 % 86

[0082] From the data analysis of Table 1, it can be seen that the dimensional accuracy of the 6063T4 twelve-cavity motor shell aluminum profile prepared by Examples 1-3 can reach the high-precision or super-high-precision level of GB / T6892-2015 "General Industrial Aluminum and Aluminum Alloy Extruded Profiles"; the 6063T4 twelve-cavity motor shell aluminum profiles prepared by Comparative Examples 1-6 have different degrees of micro-cracks, waves, twists, and size overruns. It is shown that improper extrusion process and quenching treatment process will cause defects of the 6063T4 twelve-cavity motor shell aluminum profile, and the optimization of the extrusion treatment and quenching treatment process of the present application helps to reduce production defects, and thus improves the qualified rate of the 6063T4 twelve-cavity motor shell aluminum profile.

[0083] II. The performance tests were conducted on the samples obtained by the production processes of Examples 1-3 and the comparative samples obtained by the production processes of Comparative Examples 1-6, and the results are shown in Table 2 according to GB / T 6892-2015.

[0084] Table 2: Mechanical property results

[0085]

[0086]

[0087] From the data analysis in Table 2, it can be seen that by applying an electromagnetic field, the uniformity of the profile organization is ensured, while in Comparative Example 1, no electromagnetic field is applied, resulting in a grain refinement effect that is not as good as that of Example 3, and the composition uniformity is poor, thus making the mechanical properties worse than those of Example 3; the extrusion process is optimized, and the extrusion parameters at each stage are optimized, which helps to obtain a profile with more excellent performance while ensuring production quality; the extrusion processes in Comparative Examples 2-3 are changed, resulting in poor mechanical properties; too slow speed can affect production efficiency and organization; too fast speed can result in uneven metal flow, poor surface quality, and coarse grains, thus significantly deteriorating the performance, especially the elongation; the quenching process is optimized, which also helps to improve the mechanical properties of the profile; the quenching processes in Comparative Examples 4-6 are changed; in Comparative Example 4, single air cooling is used, and the cooling capacity is insufficient to achieve full solid solution, resulting in insufficient strength and hardness; in Comparative Example 5, single water cooling is used, although the strength and hardness are acceptable, but the violent cooling method generates a large internal stress, which reduces the plasticity and toughness of the profile (low elongation), and increases the risk of deformation and cracking; in Comparative Example 6, the gas mist treatment and water curtain compensation zone are missing, which cannot achieve uniform cooling of complex sections (such as twelve cavities), resulting in uneven performance of different parts of the profile, the existence of soft spots (areas with lower strength and hardness), and the overall elongation is also affected.

[0088] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not contradict each other, they should be considered within the scope of the present disclosure. Therefore, by optimizing the process, the 6063T4 twelve-cavity motor shell aluminum profile with more excellent mechanical properties can be obtained as a whole.

[0089] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be construed as limiting the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims

1. A process for producing a 6063T4 twelve-cavity motor housing aluminum profile, characterized by, The production process comprises the following steps: The proportioned raw materials are added into a smelting furnace for smelting treatment to obtain an aluminum alloy liquid aluminum alloy melt; The aluminum alloy melt is subjected to refining treatment, degassing treatment, filtering treatment and casting treatment to obtain an aluminum bar; The aluminum bar is subjected to heating treatment, then extrusion treatment, quenching, straightening treatment, sizing and sawing to obtain a 6063T4 twelve-cavity motor shell aluminum profile; The extrusion treatment adopts a segmented control mode, including an initial stage, a filling stage and a discharging stage, the extrusion speed of the initial stage is 0.6 m / min to 1.0 m / min, the extrusion speed of the filling stage is 1.8 m / min to 3.5 m / min, and the extrusion speed of the discharging stage is 1.8 m / min to 2.0 m / min, The quenching adopts a water cooling and air cooling hybrid system, the hybrid system comprises a strong air precooling zone, an air mist treatment zone and a water curtain compensation zone, the strong air precooling zone adopts a strong air nozzle, the air pressure is 15 kPa to 20 kPa, the air temperature is 45℃ to 80℃, to avoid sudden drop of the profile surface temperature and formation of a great temperature difference between the profile center and the profile surface, and to reduce thermal stress; the air mist treatment zone adopts a plurality of nozzles surrounding the profile, the atomized water and compressed air are mixed and uniformly sprayed onto the profile surface, the water pressure is 0.5 MPa to 0.8 MPa, and the air pressure is 0.4 MPa to 0.5 MPa; the water curtain compensation zone adopts a water curtain nozzle which can be angularly turned to perform spot intensive cooling on the thicker area of the profile, to eliminate quenching blind spots and ensure uniform cooling of the whole cross section; after the quenching is completed, the profile temperature should be reduced to < 250℃.

2. The production process according to claim 1, characterized in that, The raw materials comprise the following components in mass percentage: Si 0.42% to 0.48%, Mg 0.52% to 0.56%, Fe 0.05% to 0.15%, Cu 0.01% to 0.05%, Zn 0.01% to 0.05%, Ti 0.01% to 0.05%, Cr 0.01% to 0.02%, Mn 0.01% to 0.05%, single impurity ≤ 0.05%, total impurities ≤ 0.12%, and Al balance.

3. The production process according to claim 1, characterized in that, The smelting treatment temperature is 720℃ to 740℃, and the time is 4h to 6h.

4. The production process according to claim 1, characterized in that, The refining treatment is performed under negative pressure atmosphere and by adding a refining agent, the number of refining treatment is not less than two, the time of each refining treatment is 15min to 20min, and the refining treatment temperature is 720℃ to 740℃.

5. The production process according to claim 4, characterized in that, The adding amount of the refining agent is 2% to 5% of the mass of the aluminum alloy melt.

6. The production process according to claim 1, characterized in that, The gas removal treatment uses argon, and the amount is 3m 3 / h~5m 3 / h, the rotating speed of the rotor is 500r / min~600r / min, the working pressure of the argon is 0.2MPa~0.3MPa, and the hydrogen content is controlled to be ≤0.15mL / 100g Al.

7. The production process according to claim 1, characterized in that, The filtering treatment is performed by using an online filtering device for online filtering, and 30PPi to 50PPi and 50PPi to 70PPi ceramic foam plates are used for double-stage online filtering.

8. The production process according to claim 1, characterized in that, The casting treatment temperature is 710℃ to 720℃, and an electromagnetic field is introduced during the casting process, the frequency of the electromagnetic field is 10Hz to 12Hz, and the magnetic field strength is 10000A / m to 12000A / m.

9. The production process according to claim 1, characterized in that, The temperature of the mold heating in the aluminum bar heating treatment is 470-500 DEG C, the time of the mold heating is 9-24 hours, and the temperature of the aluminum bar entering the machine is 470-490 DEG C.

10. The production process according to claim 1, characterized in that, The stretching amount of the straightening treatment is 0.8-1.5%.

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