Aluminum profile heat treatment method

Abstract

The present invention belongs to the field of heat treatment technology, in particular to a heat treatment method for aluminum profiles. Aiming at the existing problems of insufficient tensile strength and limited yield strength, the following scheme is proposed, which comprises the following steps: S1: preparing an aluminum profile heat treatment solution, wherein the raw materials of the aluminum profile heat treatment solution include 3.0 to 7.0 parts by weight of mixed rare earth chloride, 1.0 to 2.0 parts by weight of chromium dichloride, 41 to 45 parts by weight of hyperbranched polyglycerol (hPG) and 48 to 52 parts by weight of methanol; S2: conveying the aluminum profile to be heat treated into a medium frequency furnace, controlling the medium frequency furnace, starting the medium frequency furnace, and uniformly heating the aluminum profile to 220° C. to 320° C.; S3: after the heating is completed, performing an insulation treatment on the aluminum profile for 24 to 48 hours, injecting nitrogen and hydrogen successively during the heat treatment process, and then using the aluminum profile heat treatment solution for solid solution quenching, which can enhance the mechanical properties of the aluminum profile, improve the tensile strength, and enhance the yield strength.

Description

Technical Field

[0001] The present invention relates to the field of heat treatment technology, in particular to a heat treatment method for aluminum profiles. Background Art

[0002] Patent application number 202210390230.8 discloses an efficient heat treatment method for aluminum profiles in a roller hearth furnace, and the method steps are as follows: (1) laying a first layer of aluminum profiles on the material frame, and then placing a first layer of spacers in the spacer holes on the support plates and ear racks of each spacer rack; (2) placing a second layer of aluminum profiles on the spacers of the first layer, and then placing the second layer of spacers as in the steps; (3) after the material frame is full of profiles, installing the profile pressure strips and fixing them with bolts; (4) inserting fixing pins to fix the fixed positions of the spacer racks and the spacers, and the connecting positions of the ear racks and the spacers, thus completing the framing step of the aluminum profiles, and hoisting the material frame into the roller hearth furnace entrance for roller hearth furnace production; the present invention has the advantages of light weight of the material frame, low heat absorption, and small area of quenching and cooling of the profiles. It can also effectively limit the deformation of the profiles, reduce the downtime of the roller hearth furnace, improve production efficiency, and reduce the maintenance cost of the roller hearth furnace.

[0003] However, the roller-hearth furnace's efficient heat treatment method for aluminum profiles also has some problems. For example, the existing aluminum profiles use traditional heat treatment methods, but due to their large grains, the material's tensile strength is insufficient, the yield strength is limited, and the mechanical properties are limited. Summary of the Invention

[0004] Based on the problems of insufficient tensile strength and limited yield strength in the background art, the present invention proposes a heat treatment method for aluminum profiles.

[0005] The present invention provides a method for heat treating an aluminum profile, comprising the following steps:

[0006] S1: preparing an aluminum profile heat treatment solution, wherein the raw materials of the aluminum profile heat treatment solution include 3.0 to 7.0 parts by weight of mixed rare earth chloride, 1.0 to 2.0 parts of chromium dichloride, 41 to 45 parts of hyperbranched polyglycerol (hPG), and 48 to 52 parts of methanol;

[0007] S2: The aluminum profile to be heat treated is conveyed into the medium frequency furnace, the medium frequency furnace is controlled, the medium frequency furnace is started, and the aluminum profile is evenly heated to 220℃~320℃;

[0008] S3: After the heating is completed, the aluminum profile is kept warm for 24 to 48 hours. During the insulation process, 99.9% pure nitrogen is injected into the furnace, and the insulation temperature is controlled at 220°C to 320°C. After the insulation is completed, 99.9% pure hydrogen is injected into the medium frequency furnace to replace the nitrogen in the furnace. The medium frequency furnace controls the aluminum profile to cool down to 130°C at a rate of 25°C per hour. The aluminum profile is then taken out of the medium frequency furnace and air-cooled.

[0009] S4: Place the cooled aluminum profile into the medium frequency furnace for secondary heating, control the medium frequency furnace, start the medium frequency furnace, and evenly heat the aluminum profile to 550℃~600℃. After heating, perform heat preservation treatment on the aluminum profile;

[0010] S5: After the insulation is completed, the aluminum profile is subjected to solid solution quenching using an aluminum profile heat treatment solution;

[0011] S6: Obtain an aluminum profile heat treatment solution, pour the aluminum profile heat treatment solution into deionized water, use a high-speed stirring device to mix the aluminum profile heat treatment solution and deionized water, mix them evenly to obtain a diluted solution, place the aluminum profile after solid solution quenching into the diluted solution for cooling, and perform aging treatment to obtain an aluminum profile. The aluminum profile undergoes two heat treatments, and nitrogen and hydrogen are injected successively during the heat treatment process, and then the aluminum profile heat treatment solution is used for solid solution quenching, which can enhance the mechanical properties of the aluminum profile, improve the tensile strength, and enhance the yield strength.

[0012] Preferably, in S1, the mixed rare earth chloride is composed of a mixture of light rare earth chlorides of La, Ce, Pr, Nd, Sm, Eu and Gd to ensure a strengthening effect on the aluminum profile.

[0013] Preferably, in S1, the method for preparing the aluminum profile heat treatment solution is as follows: obtaining mixed rare earth chloride, chromium dichloride, hyperbranched polyglycerol (Hyperbranched Polyglycerol, hPG) and methanol, pouring the mixed rare earth chloride into methanol for mixed dissolution, pouring chromium dichloride into hyperbranched polyglycerol (Hyperbranched Polyglycerol, hPG) for mixed dissolution, and then pouring the two mixed liquids into a reactor for stirring reaction, and mixing to form an aluminum profile heat treatment solution. The prepared aluminum profile heat treatment solution has good effect.

[0014] Preferably, in S2, the heating rate of the medium frequency furnace is controlled at 40°C per second, and the temperature of the aluminum profile is continued to be heated for 30 minutes to 45 minutes after it rises to 220°C to 320°C, which can ensure the heat treatment effect on the aluminum profile.

[0015] Preferably, in S3, the aluminum profile needs to be cooled to 40° C. to 50° C. during air cooling. Air cooling is to place the aluminum profile outdoors for natural cooling to enhance the treatment effect on the aluminum profile.

[0016] Preferably, in S4, the medium frequency furnace controls the temperature of the aluminum profile to be maintained at 540° C. to 610° C. during the insulation process, and the insulation is performed for 30 minutes to 60 minutes to enhance the heat treatment effect.

[0017] Preferably, in S5, the temperature of the solution quenching is controlled at 460° C. to 600° C., and the holding time of the solution is controlled at 3 hours to 7 hours, so that the solution quenching effect is good.

[0018] Preferably, in S6, the weight ratio of the aluminum profile heat treatment solution to deionized water is controlled at 1:10 to enhance the treatment effect on the aluminum profile.

[0019] Preferably, in S6, the dilution solution further comprises sodium hydroxide, and 5 to 8 grams of sodium hydroxide are added per liter of the dilution solution to enhance the surface treatment effect on the aluminum profile.

[0020] Preferably, in S6, the cooled aluminum profile is put into an aging furnace for aging treatment, the temperature in the aging furnace is controlled in the range of 190°C to 200°C, and the aluminum profile is taken out of the aging furnace after 180 minutes of heat preservation treatment. After being taken out of the furnace, it is immediately cooled using air cooling equipment, and finally epoxy resin paint or acrylic resin paint is baked to ensure the aging treatment effect and protect the aluminum profile.

[0021] Beneficial effects of the present invention:

[0022] The aluminum profile undergoes two heat treatments, and nitrogen and hydrogen are injected successively during the heat treatment process, and then solution quenching is performed using the aluminum profile heat treatment solution, which can enhance the mechanical properties of the aluminum profile, improve the tensile strength, and enhance the yield strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The working flow diagram proposed by the present invention. DETAILED DESCRIPTION

[0024] The present invention will be further explained below with reference to specific embodiments.

[0025] Reference Figure 1 , Example 1

[0026] This embodiment provides a heat treatment method for aluminum profiles, comprising the following steps:

[0027] S1: preparing an aluminum profile heat treatment solution, wherein the raw materials of the aluminum profile heat treatment solution include 6.2 parts by weight of mixed rare earth chloride, 1.8 parts of chromium dichloride, 41 parts of hyperbranched polyglycerol (hPG) and 51 parts of methanol, wherein the mixed rare earth chloride is a mixture of light rare earth chlorides of La, Ce, Pr, Nd, Sm, Eu and Gd. The preparation method of the aluminum profile heat treatment solution comprises the following steps: obtaining mixed rare earth chloride, chromium dichloride, hyperbranched polyglycerol (hPG) and methanol, pouring the mixed rare earth chloride into methanol for mixed dissolution, pouring the chromium dichloride into hyperbranched polyglycerol (hPG) for mixed dissolution, and then pouring the two mixed solutions into a reactor for stirring and reacting to prepare the aluminum profile heat treatment solution;

[0028] S2: The aluminum profile to be heat treated is conveyed into the medium frequency furnace, the medium frequency furnace is controlled, the medium frequency furnace is started, and the aluminum profile is evenly heated to 290°C. The heating rate of the medium frequency furnace is controlled at 40°C per second. After the temperature of the aluminum profile rises to 290°C, heating is continued for 37 minutes;

[0029] S3: After the heating is completed, the aluminum profile is kept warm for 43 hours. During the insulation process, 99.9% pure nitrogen is injected into the furnace, and the insulation temperature is controlled at 280°C. After the insulation is completed, 99.9% pure hydrogen is injected into the medium frequency furnace to replace the nitrogen in the furnace. The medium frequency furnace controls the aluminum profile to cool down to 130°C at a rate of 25°C per hour. The aluminum profile is then taken out of the medium frequency furnace and air-cooled. The aluminum profile needs to be cooled to 46°C during air cooling. Air cooling is to place the aluminum profile outdoors for natural cooling.

[0030] S4: Place the cooled aluminum profile into the medium frequency furnace for secondary heating, control the medium frequency furnace, start the medium frequency furnace, and evenly heat the aluminum profile to 550℃~600℃. After heating, perform heat preservation on the aluminum profile. During the heat preservation process, the medium frequency furnace controls the temperature of the aluminum profile to be maintained at 570℃ for 45 minutes.

[0031] S5: After the insulation is completed, the aluminum profile is solution-quenched using the aluminum profile heat treatment solution. The solution quenching temperature is controlled at 560°C and the solution insulation time is controlled at 4 hours.

[0032] S6: Obtain an aluminum profile heat treatment solution, pour the aluminum profile heat treatment solution into deionized water, use a high-speed stirring device to mix the aluminum profile heat treatment solution and deionized water, control the weight ratio of the aluminum profile heat treatment solution and deionized water to be 1:10, mix them evenly to obtain a diluted solution, the diluted solution also includes sodium hydroxide, and 6 grams of sodium hydroxide is added per liter of diluted solution, the aluminum profile after solution quenching is placed in the diluted solution for cooling, and the cooled aluminum profile is placed in an aging furnace for aging treatment, the temperature in the aging furnace is controlled within the range of 190°C to 200°C, and the aluminum profile is taken out of the aging furnace after the heat preservation treatment for 180 minutes. After being taken out of the furnace, it is immediately cooled using air cooling equipment, and finally, epoxy resin paint or acrylic resin paint is baked, and the aluminum profile is obtained by aging treatment.

[0033] Reference Figure 1 , Example 2

[0034] This embodiment provides a heat treatment method for aluminum profiles, comprising the following steps:

[0035] S1: preparing an aluminum profile heat treatment solution, wherein the raw materials of the aluminum profile heat treatment solution include 5.8 parts by weight of mixed rare earth chloride, 1.2 parts of chromium dichloride, 43 parts of hyperbranched polyglycerol (hPG) and 50 parts of methanol, wherein the mixed rare earth chloride is a mixture of light rare earth chlorides of La, Ce, Pr, Nd, Sm, Eu and Gd. The preparation method of the aluminum profile heat treatment solution comprises the following steps: obtaining mixed rare earth chloride, chromium dichloride, hyperbranched polyglycerol (hPG) and methanol, pouring the mixed rare earth chloride into methanol for mixed dissolution, pouring the chromium dichloride into hyperbranched polyglycerol (hPG) for mixed dissolution, and then pouring the two mixed solutions into a reactor for stirring and reacting to prepare the aluminum profile heat treatment solution;

[0036] S2: The aluminum profile to be heat treated is conveyed into the medium frequency furnace, the medium frequency furnace is controlled, the medium frequency furnace is started, and the aluminum profile is evenly heated to 290°C. The heating rate of the medium frequency furnace is controlled at 40°C per second. After the temperature of the aluminum profile rises to 290°C, heating is continued for 37 minutes;

[0037] S3: After the heating is completed, the aluminum profile is kept warm for 43 hours. During the insulation process, 99.9% pure nitrogen is injected into the furnace, and the insulation temperature is controlled at 280°C. After the insulation is completed, 99.9% pure hydrogen is injected into the medium frequency furnace to replace the nitrogen in the furnace. The medium frequency furnace controls the aluminum profile to cool down to 130°C at a rate of 25°C per hour. The aluminum profile is then taken out of the medium frequency furnace and air-cooled. The aluminum profile needs to be cooled to 46°C during air cooling. Air cooling is to place the aluminum profile outdoors for natural cooling.

[0038] S4: Place the cooled aluminum profile into the medium frequency furnace for secondary heating, control the medium frequency furnace, start the medium frequency furnace, and evenly heat the aluminum profile to 550℃~600℃. After heating, perform heat preservation on the aluminum profile. During the heat preservation process, the medium frequency furnace controls the temperature of the aluminum profile to be maintained at 570℃ for 45 minutes.

[0039] S5: After the insulation is completed, the aluminum profile is solution-quenched using the aluminum profile heat treatment solution. The solution quenching temperature is controlled at 560°C and the solution insulation time is controlled at 4 hours.

[0040] S6: Obtain an aluminum profile heat treatment solution, pour the aluminum profile heat treatment solution into deionized water, use a high-speed stirring device to mix the aluminum profile heat treatment solution and deionized water, control the weight ratio of the aluminum profile heat treatment solution and deionized water to be 1:10, mix them evenly to obtain a diluted solution, the diluted solution also includes sodium hydroxide, and 6 grams of sodium hydroxide is added per liter of diluted solution, the aluminum profile after solution quenching is placed in the diluted solution for cooling, and the cooled aluminum profile is placed in an aging furnace for aging treatment, the temperature in the aging furnace is controlled within the range of 190°C to 200°C, and the aluminum profile is taken out of the aging furnace after the heat preservation treatment for 180 minutes. After being taken out of the furnace, it is immediately cooled using air cooling equipment, and finally, epoxy resin paint or acrylic resin paint is baked, and the aluminum profile is obtained by aging treatment.

[0041] Reference Figure 1 , Example 3

[0042] This embodiment provides a heat treatment method for aluminum profiles, comprising the following steps:

[0043] S1: preparing an aluminum profile heat treatment solution, wherein the raw materials of the aluminum profile heat treatment solution include 5.2 parts by weight of mixed rare earth chloride, 1.8 parts of chromium dichloride, 44 parts of hyperbranched polyglycerol (hPG) and 49 parts of methanol, wherein the mixed rare earth chloride is a mixture of light rare earth chlorides of La, Ce, Pr, Nd, Sm, Eu and Gd. The preparation method of the aluminum profile heat treatment solution comprises the following steps: obtaining mixed rare earth chloride, chromium dichloride, hyperbranched polyglycerol (hPG) and methanol, pouring the mixed rare earth chloride into methanol for mixed dissolution, pouring the chromium dichloride into hyperbranched polyglycerol (hPG) for mixed dissolution, and then pouring the two mixed solutions into a reactor for stirring and reacting to prepare the aluminum profile heat treatment solution;

[0044] S2: The aluminum profile to be heat treated is conveyed into the medium frequency furnace, the medium frequency furnace is controlled, the medium frequency furnace is started, and the aluminum profile is evenly heated to 290°C. The heating rate of the medium frequency furnace is controlled at 40°C per second. After the temperature of the aluminum profile rises to 290°C, heating is continued for 37 minutes;

[0045] S3: After the heating is completed, the aluminum profile is kept warm for 43 hours. During the insulation process, 99.9% pure nitrogen is injected into the furnace, and the insulation temperature is controlled at 280°C. After the insulation is completed, 99.9% pure hydrogen is injected into the medium frequency furnace to replace the nitrogen in the furnace. The medium frequency furnace controls the aluminum profile to cool down to 130°C at a rate of 25°C per hour. The aluminum profile is then taken out of the medium frequency furnace and air-cooled. The aluminum profile needs to be cooled to 46°C during air cooling. Air cooling is to place the aluminum profile outdoors for natural cooling.

[0046] S4: Place the cooled aluminum profile into the medium frequency furnace for secondary heating, control the medium frequency furnace, start the medium frequency furnace, and evenly heat the aluminum profile to 550℃~600℃. After heating, perform heat preservation on the aluminum profile. During the heat preservation process, the medium frequency furnace controls the temperature of the aluminum profile to be maintained at 570℃ for 45 minutes.

[0047] S5: After the insulation is completed, the aluminum profile is solution-quenched using the aluminum profile heat treatment solution. The solution quenching temperature is controlled at 560°C and the solution insulation time is controlled at 4 hours.

[0048] S6: Obtain an aluminum profile heat treatment solution, pour the aluminum profile heat treatment solution into deionized water, use a high-speed stirring device to mix the aluminum profile heat treatment solution and deionized water, control the weight ratio of the aluminum profile heat treatment solution and deionized water to be 1:10, mix them evenly to obtain a diluted solution, the diluted solution also includes sodium hydroxide, and 6 grams of sodium hydroxide is added per liter of diluted solution, the aluminum profile after solution quenching is placed in the diluted solution for cooling, and the cooled aluminum profile is placed in an aging furnace for aging treatment, the temperature in the aging furnace is controlled within the range of 190°C to 200°C, and the aluminum profile is taken out of the aging furnace after the heat preservation treatment for 180 minutes. After being taken out of the furnace, it is immediately cooled using air cooling equipment, and finally, epoxy resin paint or acrylic resin paint is baked, and the aluminum profile is obtained by aging treatment.

[0049] Reference Figure 1 , Example 4

[0050] This embodiment provides a heat treatment method for aluminum profiles, comprising the following steps:

[0051] S1: preparing an aluminum profile heat treatment solution, wherein the raw materials of the aluminum profile heat treatment solution include, by weight, 4.0 parts of mixed rare earth chloride, 2.0 parts of chromium dichloride, 45 parts of hyperbranched polyglycerol (hPG) and 49 parts of methanol, wherein the mixed rare earth chloride is a mixture of light rare earth chlorides of La, Ce, Pr, Nd, Sm, Eu and Gd. The preparation method of the aluminum profile heat treatment solution comprises: obtaining mixed rare earth chloride, chromium dichloride, hyperbranched polyglycerol (hPG) and methanol, pouring the mixed rare earth chloride into methanol for mixed dissolution, pouring the chromium dichloride into hyperbranched polyglycerol (hPG) for mixed dissolution, and then pouring the two mixed solutions into a reactor for stirring and reacting to prepare the aluminum profile heat treatment solution;

[0052] S2: The aluminum profile to be heat treated is conveyed into the medium frequency furnace, the medium frequency furnace is controlled, the medium frequency furnace is started, and the aluminum profile is evenly heated to 290°C. The heating rate of the medium frequency furnace is controlled at 40°C per second. After the temperature of the aluminum profile rises to 290°C, heating is continued for 37 minutes;

[0053] S3: After the heating is completed, the aluminum profile is kept warm for 43 hours. During the insulation process, 99.9% pure nitrogen is injected into the furnace, and the insulation temperature is controlled at 280°C. After the insulation is completed, 99.9% pure hydrogen is injected into the medium frequency furnace to replace the nitrogen in the furnace. The medium frequency furnace controls the aluminum profile to cool down to 130°C at a rate of 25°C per hour. The aluminum profile is then taken out of the medium frequency furnace and air-cooled. The aluminum profile needs to be cooled to 46°C during air cooling. Air cooling is to place the aluminum profile outdoors for natural cooling.

[0054] S4: Place the cooled aluminum profile into the medium frequency furnace for secondary heating, control the medium frequency furnace, start the medium frequency furnace, and evenly heat the aluminum profile to 550℃~600℃. After heating, perform heat preservation on the aluminum profile. During the heat preservation process, the medium frequency furnace controls the temperature of the aluminum profile to be maintained at 570℃ for 45 minutes.

[0055] S5: After the insulation is completed, the aluminum profile is solution-quenched using the aluminum profile heat treatment solution. The solution quenching temperature is controlled at 560°C and the solution insulation time is controlled at 4 hours.

[0056] S6: Obtain an aluminum profile heat treatment solution, pour the aluminum profile heat treatment solution into deionized water, use a high-speed stirring device to mix the aluminum profile heat treatment solution and deionized water, control the weight ratio of the aluminum profile heat treatment solution and deionized water to be 1:10, mix them evenly to obtain a diluted solution, the diluted solution also includes sodium hydroxide, and 6 grams of sodium hydroxide is added per liter of diluted solution, the aluminum profile after solution quenching is placed in the diluted solution for cooling, and the cooled aluminum profile is placed in an aging furnace for aging treatment, the temperature in the aging furnace is controlled within the range of 190°C to 200°C, and the aluminum profile is taken out of the aging furnace after the heat preservation treatment for 180 minutes. After being taken out of the furnace, it is immediately cooled using air cooling equipment, and finally, epoxy resin paint or acrylic resin paint is baked, and the aluminum profile is obtained by aging treatment.

[0057] Reference Figure 1 , Example 5

[0058] This embodiment provides a heat treatment method for aluminum profiles, comprising the following steps:

[0059] S1: preparing an aluminum profile heat treatment solution, wherein the raw materials of the aluminum profile heat treatment solution include 5.0 parts by weight of mixed rare earth chloride, 1.0 part of chromium dichloride, 44 parts of hyperbranched polyglycerol (hPG) and 50 parts of methanol, wherein the mixed rare earth chloride is a mixture of light rare earth chlorides of La, Ce, Pr, Nd, Sm, Eu and Gd. The preparation method of the aluminum profile heat treatment solution comprises the following steps: obtaining mixed rare earth chloride, chromium dichloride, hyperbranched polyglycerol (hPG) and methanol, pouring the mixed rare earth chloride into methanol for mixed dissolution, pouring the chromium dichloride into hyperbranched polyglycerol (hPG) for mixed dissolution, and then pouring the two mixed solutions into a reactor for stirring and reacting to prepare the aluminum profile heat treatment solution;

[0060] S2: The aluminum profile to be heat treated is conveyed into the medium frequency furnace, the medium frequency furnace is controlled, the medium frequency furnace is started, and the aluminum profile is evenly heated to 290°C. The heating rate of the medium frequency furnace is controlled at 40°C per second. After the temperature of the aluminum profile rises to 290°C, heating is continued for 37 minutes;

[0061] S3: After the heating is completed, the aluminum profile is kept warm for 43 hours. During the insulation process, 99.9% pure nitrogen is injected into the furnace, and the insulation temperature is controlled at 280°C. After the insulation is completed, 99.9% pure hydrogen is injected into the medium frequency furnace to replace the nitrogen in the furnace. The medium frequency furnace controls the aluminum profile to cool down to 130°C at a rate of 25°C per hour. The aluminum profile is then taken out of the medium frequency furnace and air-cooled. The aluminum profile needs to be cooled to 46°C during air cooling. Air cooling is to place the aluminum profile outdoors for natural cooling.

[0062] S4: Place the cooled aluminum profile into the medium frequency furnace for secondary heating, control the medium frequency furnace, start the medium frequency furnace, and evenly heat the aluminum profile to 550℃~600℃. After heating, perform heat preservation on the aluminum profile. During the heat preservation process, the medium frequency furnace controls the temperature of the aluminum profile to be maintained at 570℃ for 45 minutes.

[0063] S5: After the insulation is completed, the aluminum profile is solution-quenched using the aluminum profile heat treatment solution. The solution quenching temperature is controlled at 560°C and the solution insulation time is controlled at 4 hours.

[0064] S6: Obtain an aluminum profile heat treatment solution, pour the aluminum profile heat treatment solution into deionized water, use a high-speed stirring device to mix the aluminum profile heat treatment solution and deionized water, control the weight ratio of the aluminum profile heat treatment solution and deionized water to be 1:10, mix them evenly to obtain a diluted solution, the diluted solution also includes sodium hydroxide, and 6 grams of sodium hydroxide is added per liter of diluted solution, the aluminum profile after solution quenching is placed in the diluted solution for cooling, and the cooled aluminum profile is placed in an aging furnace for aging treatment, the temperature in the aging furnace is controlled within the range of 190°C to 200°C, and the aluminum profile is taken out of the aging furnace after the heat preservation treatment for 180 minutes. After being taken out of the furnace, it is immediately cooled using air cooling equipment, and finally, epoxy resin paint or acrylic resin paint is baked, and the aluminum profile is obtained by aging treatment.

[0065] Comparing conventional aluminum profiles with the aluminum profiles prepared in Examples 1 to 5, the aluminum profiles prepared in Examples 1 to 5 are shown in the following table:

[0066]

[0067] It can be seen from the above table that the tensile strength and yield strength of the aluminum profile produced by the present invention are significantly improved, and embodiment 2 is the best embodiment.

[0068] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A heat treatment method for aluminum profiles, characterized in that: The following steps are involved: S1: preparing an aluminum profile heat treatment solution, wherein the raw materials of the aluminum profile heat treatment solution include 3.0 to 7.0 parts by weight of mixed rare earth chloride, 1.0 to 2.0 parts of chromium dichloride, 41 to 45 parts of hyperbranched polyglycerol (hPG), and 48 to 52 parts of methanol; S2: The aluminum profile to be heat treated is conveyed into the medium frequency furnace, the medium frequency furnace is controlled, the medium frequency furnace is started, and the aluminum profile is evenly heated to 220℃~320℃; S3: After heating is completed, the aluminum profile is kept warm for 24 to 48 hours. During the insulation process, 99.9% pure nitrogen is injected into the furnace, and the insulation temperature is controlled at 220°C to 320°C. After the insulation is completed, 99.9% pure hydrogen is injected into the medium frequency furnace to replace the nitrogen in the furnace. The medium frequency furnace controls the aluminum profile to cool down to 130°C at a rate of 25°C per hour. The aluminum profile is then taken out of the medium frequency furnace and air-cooled. S4: Place the cooled aluminum profile into the medium frequency furnace for secondary heating, control the medium frequency furnace, start the medium frequency furnace, and evenly heat the aluminum profile to 550℃~600℃. After heating, perform heat preservation treatment on the aluminum profile; S5: After the insulation is completed, the aluminum profile is subjected to solid solution quenching using an aluminum profile heat treatment solution; S6: Obtain an aluminum profile heat treatment solution, pour the aluminum profile heat treatment solution into deionized water, use a high-speed stirring device to mix the aluminum profile heat treatment solution and deionized water, mix them evenly to obtain a diluted solution, place the aluminum profile after solution quenching into the diluted solution for cooling, and perform aging treatment to obtain the aluminum profile.

2. The aluminum profile heat treatment method according to claim 1, characterized in that: In the S1, the mixed rare earth chloride is composed of a mixture of light rare earth element chlorides of La, Ce, Pr, Nd, Sm, Eu and Gd.

3. The aluminum profile heat treatment method according to claim 1, characterized in that: In S1, the preparation method of the aluminum profile heat treatment solution includes obtaining a mixed rare earth chloride, chromium dichloride, hyperbranched polyglycerol (hPG), and methanol, pouring the mixed rare earth chloride into methanol for mixed dissolution, pouring the chromium dichloride into hyperbranched polyglycerol (hPG) for mixed dissolution, and then pouring the two mixed solutions into a reactor for stirring and reacting to prepare the aluminum profile heat treatment solution.

4. The aluminum profile heat treatment method according to claim 1, characterized in that: In S2, the heating speed of the medium frequency furnace is controlled at 40°C per second, and the temperature of the aluminum profile is raised to 220°C to 320°C and then continued to be heated for 30 minutes to 45 minutes.

5. The aluminum profile heat treatment method according to claim 1, characterized in that: In the above S3, the aluminum profile needs to be cooled to 40° C. to 50° C. during air cooling. Air cooling is to place the aluminum profile outdoors for natural cooling.

6. The aluminum profile heat treatment method according to claim 1, characterized in that: In the above S4, during the heat preservation, the medium frequency furnace controls the temperature of the aluminum profile to be maintained at 540° C. to 610° C. for 30 minutes to 60 minutes.

7. The aluminum profile heat treatment method according to claim 1, characterized in that: In the step S5, the temperature of the solution quenching is controlled at 460° C. to 600° C., and the holding time of the solution quenching is controlled at 3 hours to 7 hours.

8. The aluminum profile heat treatment method according to claim 1, characterized in that: In S6, the weight ratio of the aluminum profile heat treatment solution to the deionized water is controlled at 1:

10.

9. The aluminum profile heat treatment method according to claim 1, characterized in that: In S6, the diluted solution further includes sodium hydroxide, and 5 to 8 grams of sodium hydroxide are added per liter of the diluted solution.

10. The aluminum profile heat treatment method according to claim 1, characterized in that: In S6, the cooled aluminum profile is put into an aging furnace for aging treatment. The temperature in the aging furnace is controlled within the range of 190° C. to 200° C. After 180 minutes of heat preservation treatment, the aluminum profile is taken out of the aging furnace and immediately cooled using air cooling equipment after being taken out of the furnace. Finally, epoxy resin paint or acrylic resin paint is baked.

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