CN113755724A - Preparation process of aluminum alloy profile - Google Patents
Preparation process of aluminum alloy profile Download PDFInfo
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- CN113755724A CN113755724A CN202110819373.1A CN202110819373A CN113755724A CN 113755724 A CN113755724 A CN 113755724A CN 202110819373 A CN202110819373 A CN 202110819373A CN 113755724 A CN113755724 A CN 113755724A
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
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- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
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Abstract
The invention provides a preparation process of an aluminum alloy section, and relates to the technical field of preparation of aluminum alloy sections. The preparation process comprises the steps of material preparation, casting, homogenization treatment, extrusion forming, solution quenching and aging treatment, wherein the aluminum alloy profile comprises the following raw materials in percentage by mass: mg: 0.9-1.4%, Si: 1.0-1.5%, Fe: < 0.25%, Mn: 0.6-1.1%, Cr: 0.03-0.08%, Cu: 0.03 to 0.08%, Ti: 0.05-0.1 percent of Al; during casting, the temperature of the aluminum alloy melt is 720-760 ℃; during homogenization treatment, the heating temperature is 540-; the extrusion ratio is 55-65 when the extrusion molding is carried out; during solution quenching, the temperature is 520-550 ℃, the heat preservation time is 2-4h, and the time interval is 5-40s when the section is transferred; the temperature is 160-. The preparation process improves the strength and the elongation, namely the obdurability, of the obtained aluminum alloy section, wherein the tensile strength of the aluminum alloy section is improved to be 380MPa from 360 ℃, the yield strength is improved to be 340MPa from 310 ℃ and the elongation is improved to be 13-19.
Description
Technical Field
The invention relates to the technical field of aluminum alloy section bar preparation, in particular to a preparation process of an aluminum alloy section bar.
Background
The application of aluminum alloy materials in the field of automobiles is increasingly wide, and the mechanical properties of aluminum alloy sections are concerned in order to ensure the safety performance of automobiles. In order to ensure that the mechanical property of the aluminum alloy section bar reaches the existing standard, Sn, Bi, W, V, Ni, Si and other elements can be added into the aluminum alloy, but the cost of the alloy material is increased, and the aluminum alloy is difficult to form during casting or extrusion.
In the extrusion production process, the strength of the extruded section can be improved through a certain procedure, for example, an online quenching process can be adjusted through an online quenching system, but the method is too single, and the alloy strength improvement effect is limited. In addition, since the elongation of the aluminum alloy material tends to decrease with the increase in strength, it is necessary to provide a high-strength and high-toughness aluminum alloy material having a high strength and a relatively high elongation.
Disclosure of Invention
The invention aims to provide a preparation process of an aluminum alloy section, which aims to solve the technical problem that the strength and toughness of the aluminum alloy section are low in the prior art.
The invention provides a preparation process of an aluminum alloy section, which comprises the following steps:
s100, preparing materials: the aluminum alloy profile comprises the following raw materials in percentage by mass: mg: 0.9-1.4%, Si: 1.0-1.5%, Fe: < 0.25%, Mn: 0.6-1.1%, Cr: 0.03-0.08%, Cu: 0.03 to 0.08%, Ti: 0.05-0.1 percent of Al;
s200, casting: melting the raw materials of the aluminum alloy profile and casting the raw materials into a cast rod, wherein the temperature of the molten aluminum alloy is 720-760 ℃;
s300, homogenization treatment: carrying out homogenization treatment on the obtained cast rod, wherein the heating temperature of the homogenization treatment is 540-;
s400, extrusion forming: extruding the cast rod after the homogenization treatment to obtain a profile, wherein the extrusion ratio is 55-65;
s500, solution quenching: carrying out solid solution quenching on the obtained section, wherein the temperature of the solid solution quenching is 520-550 ℃, the heat preservation time is 2-4h, and after taking the section out of the heat preservation furnace for 5-40s, putting the section into water;
s600, aging treatment: and (3) carrying out aging treatment on the section after the solution quenching, wherein the temperature of the aging treatment is 160-180 ℃, and the heat preservation time is 6-12 h.
The preparation process of the aluminum alloy section provided by the invention can produce the following beneficial effects:
according to the preparation process of the aluminum alloy section provided by the invention, through adjusting the raw material ratio, controlling the casting temperature, carrying out homogenization treatment on a cast rod, controlling the extrusion ratio of extrusion forming, carrying out solution quenching and aging treatment on the obtained section and the like, particularly during solution quenching, the heat preservation temperature and the heat preservation time are controlled, the strength and the elongation of the obtained aluminum alloy section are improved, the toughness of the obtained aluminum alloy section is also improved, the time interval of transferring the aluminum alloy section from a heat preservation furnace to water is also controlled, and the strength and the elongation of the aluminum alloy section can be controlled according to the requirements of customers. Wherein, the tensile strength of the aluminum alloy section is increased to 380MPa of 360 ℃, the yield strength is increased to 340MPa of 310, and the elongation is increased to 13-19.
In addition, in the raw materials of the aluminum alloy section, Cr, Cu and Ti are trace elements, and the addition amount is small, so that the strength of the aluminum alloy section is improved, and meanwhile, the production cost is also controlled by the preparation process of the aluminum alloy section.
Further, the casting step comprises three times of refining, wherein a refining agent is a sodium-free refining agent, 2-2.5Kg of refining agent is used for each ton of aluminum alloy melt, and the refining time is 10-15 min; the first refining is carried out in a smelting furnace, and the second and third refining are carried out in a standing furnace.
According to the technical scheme, first refining is carried out in a smelting furnace, then molten aluminum alloy is led into a standing furnace, and then secondary refining and third refining are carried out. Through three times of refining, the purity of the aluminum alloy melt can be effectively improved, and the toughness of the aluminum alloy section bar made of the aluminum alloy melt can be improved.
Further, during the casting process, a ceramic tool is used for slagging off during slagging off.
Under this technical scheme, use the ceramic tool to replace the metal instrument of iron instrument or other materials that usually uses, can avoid taking off the condition that Fe or other metallic element in the instrument of slagging-off mix the aluminum alloy melt to can strictly control the quality proportion of aluminum alloy ex-trusions raw materials, guarantee the purity of aluminum alloy melt and the obdurability of aluminum alloy ex-trusions.
Further, in the casting process, a degassing box is used for degassing the aluminum alloy melt, and argon or nitrogen is used as protective gas.
Under this technical scheme, select for use inert gas such as argon gas or nitrogen gas as protective gas, carry out the degasification to the aluminum alloy melt, can enough reduce the bubble in the aluminum alloy melt, can guarantee aluminum alloy melt chemical property's stability again.
Furthermore, in the casting process, the aluminum alloy melt is subjected to multistage filtration, and the mesh number of the filter plates is 30-60 meshes.
Under the technical scheme, the molten aluminum alloy is filtered for multiple times, so that the purity is higher and higher, and the casting of the high-strength and high-toughness aluminum alloy section is facilitated.
Further, when the casting step is executed, the aluminum alloy melt is cast into a casting rod by a hot top casting method, the temperature of the aluminum alloy melt is 680-720 ℃, the casting speed is 125-140mm/min, the pressure of the cooling water is 0.15-0.2MPa, and the temperature of the cooling water is 10-40 ℃.
Further, when the homogenization treatment is carried out, the air cooling time is 30-40min, the fog cooling time is 20-40min, and the water cooling time is 60-100 min.
Under this technical scheme, through tertiary segment cooling, can make the texture of aluminum alloy cast rod more even, guarantee to reach the required quality to cast the excellent straightness accuracy to can improve the homogeneity of aluminum alloy cast rod and aluminum alloy ex-trusions wholeness ability.
Further, when the extrusion molding step is executed, the casting rod is heated to 470-540 ℃ by adopting an electromagnetic induction gradient heating mode, the heating temperature of the front end of the casting rod is 520-540 ℃, and the heating gradient is more than 0 ℃/cm and less than or equal to 1.5 ℃/cm.
Under this technical scheme, through the mode of electromagnetic induction gradient heating, make and cast excellent front end temperature height, cast excellent rear end temperature low, at the extruded in-process, the heat that the extrusion work produced makes and casts excellent rear end temperature and rise to extrusion temperature, thereby can enough guarantee that all places of casting stick have close temperature when the extrusion, guarantee that every section bar both ends of casting the excellent extrusion have homogeneous performance, can effectively avoid the cast stick of non-gradient heating to cast excellent rear end temperature along with extruded going on too high, need cool off and influence the condition of extrusion speed, in other words, adopt the mode of electromagnetic induction gradient heating, can also improve extrusion speed, improve production efficiency.
Further, when the extrusion forming step is carried out, the next cast rod is advanced by 10-60s before the previous cast rod is extruded.
Under this technical scheme, can guarantee production in succession to can promote production efficiency.
Further, after the step of extrusion forming is carried out, before the obtained section is subjected to the solution quenching, a stretcher is used for carrying out stretching and straightening treatment on the obtained section, and during stretching, a section shape-imitating block is placed in a cavity of the section, wherein the stretching rate is 0.8-1.5%.
Under this technical scheme, stretch the straightening to gained section bar, can make the section bar more regular to accord with the user demand, and place the shape-imitating piece in the hollow die cavity of section bar, then be favorable to keeping the die cavity rule of section bar.
Further, after the aging treatment is carried out on the obtained section, the obtained section is cooled, and the cooling mode is one of air cooling, strong wind cooling and water mist cooling.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a process for preparing an aluminum alloy profile according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In this embodiment, a process for preparing an aluminum alloy profile is provided, as shown in fig. 1, the process includes the following steps:
s100, preparing materials: the aluminum alloy profile comprises the following raw materials in percentage by mass: mg: 0.9-1.4%, Si: 1.0-1.5%, Fe: < 0.25%, Mn: 0.6-1.1%, Cr: 0.03-0.08%, Cu: 0.03 to 0.08%, Ti: 0.05-0.1% and the balance of Al.
More specifically, the mass ratio of the raw materials can be as follows: mg: 1.038%, Si: 1.157%, Fe: 0.213%, Mn: 0.724%, Cr: 0.06%, Cu: 0.05%, Ti: 0.08 percent and the balance of Al.
S200, casting: melting the raw materials of the aluminum alloy profile and casting the aluminum alloy profile into a cast rod, wherein the temperature of the aluminum alloy melt is 720-760 ℃.
More specifically, the temperature of the aluminum alloy melt may be 750 ℃.
S300, homogenization treatment: and carrying out homogenization treatment on the obtained cast rod, wherein the heating temperature of the homogenization treatment is 540-.
More specifically, the heating temperature of the homogenization treatment may be 550 ℃ and the holding time may be 3 to 6 hours.
S400, extrusion forming: and extruding the homogenized cast rod to obtain the profile, wherein the extrusion ratio is 55-65.
S500, solution quenching: and carrying out solution quenching on the obtained section, wherein the temperature of the solution quenching is 520-550 ℃, the heat preservation time is 2-4h, and after the section is taken out from the heat preservation furnace for 5-40s, the section is put into water.
More specifically, the temperature of the solution quenching can be 540 ℃, the holding time can be 4h, and the time interval of the profile transfer can be 5 s.
S600, aging treatment: and (3) carrying out aging treatment on the section after the solution quenching, wherein the temperature of the aging treatment is 160-180 ℃, and the heat preservation time is 6-12 h.
More specifically, the temperature of the aging treatment may be 165 ℃ and the holding time may be 10 hours.
According to the preparation process of the aluminum alloy section provided by the embodiment, through adjusting the raw material ratio, controlling the casting temperature, carrying out homogenization treatment on a cast rod, controlling the extrusion ratio of extrusion forming, carrying out solution quenching and aging treatment on the obtained section and the like, particularly during solution quenching, the heat preservation temperature and the heat preservation time are controlled, and the time interval of transferring the section from a heat preservation furnace to water is also controlled, so that the strength and the elongation of the obtained aluminum alloy section are improved, namely the toughness and the toughness of the obtained aluminum alloy section are improved, and the strength and the elongation of the aluminum alloy section can be controlled according to the requirements of customers. Wherein, the tensile strength of the aluminum alloy section is increased to 380MPa of 360 ℃, the yield strength is increased to 340MPa of 310, and the elongation is increased to 13-19.
In addition, in the raw materials of the aluminum alloy section, the Cr, the Cu and the Ti are trace elements, and the addition amount is small, so that the strength of the aluminum alloy section is improved, and meanwhile, the production cost is also controlled by the preparation process of the aluminum alloy section provided by the embodiment.
Specifically, in this embodiment, the casting step includes refining for three times, where the refining agent is a sodium-free refining agent, 2 to 2.5Kg of the refining agent is used for each ton of the aluminum alloy melt, and the refining time is 10 to 15min for each time; the first refining is carried out in a smelting furnace, and the second and third refining are carried out in a standing furnace. In the specific implementation, first refining is carried out in a smelting furnace, then the molten aluminum alloy is introduced into a standing furnace, and then secondary and third refining are carried out. Through three times of refining, the purity of the aluminum alloy melt can be effectively improved, and the toughness of the aluminum alloy section bar made of the aluminum alloy melt can be improved.
Specifically, in the embodiment, during the casting process, a ceramic tool is used for slag skimming. The ceramic tool is used for replacing a commonly used iron tool or a metal tool made of other materials, so that the condition that Fe or other metal elements in the slag removing tool are doped into the aluminum alloy melt can be avoided, the mass ratio of the raw materials of the aluminum alloy section bar can be strictly controlled, and the purity of the aluminum alloy melt and the toughness of the aluminum alloy section bar are ensured.
Specifically, in the embodiment, during the casting process, a degassing tank may be used to degas the aluminum alloy melt, and argon or nitrogen may be used as the protective gas. Inert gases such as argon or nitrogen are selected as protective gases to degas the aluminum alloy melt, so that bubbles in the aluminum alloy melt can be reduced, and the stability of the chemical properties of the aluminum alloy melt can be ensured.
Specifically, in the embodiment, in the casting process, the aluminum alloy melt can be subjected to multistage filtration, and the mesh number of the filter plates is 30-60 meshes. For example: can carry out the cubic to the aluminium alloy melt and filter, the mesh number of the filter that the cubic was filtered and is used can increase gradually, can be 30 meshes, 40 meshes and 60 meshes respectively, so, the filtering precision of filtering at every turn all improves to some extent than the previous filtration, and the purity of aluminium alloy melt is also higher and higher to be favorable to the casting of high obdurability aluminium alloy ex-trusions. Of course, in other embodiments of the present application, the number of times of filtration may be two or four, and even if the number of times of filtration is three, the number of filter plates used in the three-time filtration is not limited to the above-mentioned number, and may be, for example, 40 mesh, 50 mesh, and 60 mesh.
Specifically, in this embodiment, when the casting step is performed, a hot top casting method is adopted to cast the aluminum alloy melt into the casting rod, the temperature of the aluminum alloy melt is 680-720 ℃, the casting speed is 125-140mm/min, the pressure of the cooling water is 0.15-0.2MPa, and the temperature of the cooling water is 10-40 ℃. For example: the temperature of the molten aluminum alloy is 700 ℃, the casting speed is 130mm/min, the pressure of cooling water is 0.16MPa, and the temperature of the cooling water is 35 ℃.
Specifically, in this embodiment, the homogenization step is performed in an air cooling time of 30-40min, a mist cooling time of 20-40min, and a water cooling time of 60-100 min. For example: the air cooling time can be 30min, the fog cooling time can be 20min, and the water cooling time can be 60 min. Through three-stage segmented cooling, the texture of the aluminum alloy cast rod can be more uniform, and the quality requirement on the straightness of the cast rod is guaranteed, so that the uniformity of the overall performance of the aluminum alloy cast rod and the aluminum alloy section can be improved.
Specifically, in the embodiment, when the step of extrusion molding is performed, the casting rod is heated to 470-540 ℃ by adopting an electromagnetic induction gradient heating manner, the heating temperature of the front end of the casting rod is 520-540 ℃, and the heating gradient is greater than 0 ℃/cm and less than or equal to 1.5 ℃/cm. For example: the front end of the cast bar may be heated to 530 ℃ with a heating gradient of 1.3 ℃/cm. Through the mode of electromagnetic induction gradient heating, make the front end temperature of casting the stick high, it is low to cast the stick rear end temperature, at the extruded in-process, the heat that the extrusion work produced makes the rear end temperature of casting the stick rise to extrusion temperature, thereby can enough guarantee that each department of casting the stick has similar temperature when the extrusion, guarantee that every section bar both ends of casting the stick and extruding have homogeneous performance, can effectively avoid the casting stick of non-gradient heating to cast the stick rear end temperature too high along with extruded going on, need cool off and influence the condition of extrusion speed, in other words, adopt the mode of electromagnetic induction gradient heating, can also improve extrusion speed, improve production efficiency.
Here, the term "front end of the cast rod" means the end of the cast rod that enters the extrusion chamber first, and the term "rear end of the cast rod" means the end of the cast rod that enters the extrusion chamber last.
Specifically, in the embodiment, when the extrusion molding step is performed, the next cast rod is advanced by 10 to 60 seconds before the previous cast rod is extruded. For example: the next cast bar can be tapped 30s in advance. The rod is advanced, so that the production is continuous, and the production efficiency can be improved.
Specifically, in this embodiment, after the step of performing extrusion molding and before the obtained profile is subjected to solution quenching, the obtained profile is subjected to stretching and straightening treatment by using a stretcher, and during stretching, a profile shaped block is placed in a cavity of the profile, and the stretching rate is 0.8 to 1.5%. More specifically, the stretching ratio may be 1.2%. The obtained section bar is stretched and straightened, so that the section bar is more regular, the use requirement is met, and the cavity rule of the section bar is favorably kept by placing the contour block in the hollow cavity of the section bar.
Specifically, in this embodiment, after performing aging treatment on the obtained section bar, the obtained section bar is cooled, and the cooling mode is one of air cooling, forced air cooling, and water mist cooling. And after the aging treatment, cooling the section to obtain the required aluminum alloy section.
In conclusion, by using the preparation process of the aluminum alloy section provided by the embodiment, the strength of the aluminum alloy section is improved, and meanwhile, the elongation is higher, namely, the aluminum alloy section with high strength and toughness can be obtained by the preparation process. During proportioning, a small amount of trace elements Cr, Cu and Ti are added into the raw materials, so that the strength of the aluminum alloy is improved, and the material cost can be reduced; in the casting stage of the cast rod, a ceramic slag removing tool is preferably selected, so that the content of harmful element Fe in the aluminum alloy melt can be effectively reduced; the melt is purer by additionally arranging measures such as furnace reversing, refining position optimization, refining agent type optimization, degassing, multi-stage filtration and the like, and a foundation is laid for improving the strength and toughness of the aluminum alloy section in the later period; in the extrusion forming stage, the production efficiency is improved by the measures of electromagnetic induction gradient heating of the cast rod, rod discharging in advance and the like; the solution quenching can control the toughness of the section bar to meet the requirements of customers on the basis of the steps. In addition, the preparation process is simple, easy to operate and easy to realize.
Finally, it is further noted that, herein, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to the embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (11)
1. The preparation process of the aluminum alloy profile is characterized by comprising the following steps of:
s100, preparing materials: the aluminum alloy profile comprises the following raw materials in percentage by mass: mg: 0.9-1.4%, Si: 1.0-1.5%, Fe: < 0.25%, Mn: 0.6-1.1%, Cr: 0.03-0.08%, Cu: 0.03 to 0.08%, Ti: 0.05-0.1 percent of Al;
s200, casting: melting the raw materials of the aluminum alloy profile and casting the raw materials into a cast rod, wherein the temperature of the molten aluminum alloy is 720-760 ℃;
s300, homogenization treatment: carrying out homogenization treatment on the obtained cast rod, wherein the heating temperature of the homogenization treatment is 540-;
s400, extrusion forming: extruding the cast rod after the homogenization treatment to obtain a profile, wherein the extrusion ratio is 55-65;
s500, solution quenching: carrying out solid solution quenching on the obtained section, wherein the temperature of the solid solution quenching is 520-550 ℃, the heat preservation time is 2-4h, and after taking the section out of the heat preservation furnace for 5-40s, putting the section into water;
s600, aging treatment: and (3) carrying out aging treatment on the section after the solution quenching, wherein the temperature of the aging treatment is 160-180 ℃, and the heat preservation time is 6-12 h.
2. The process for preparing the aluminum alloy profile according to claim 1, wherein the step of casting comprises three times of refining, the refining agent is a sodium-free refining agent, 2-2.5Kg of refining agent is used for each ton of aluminum alloy melt, and the time of each refining is 10-15 min; the first refining is carried out in a smelting furnace, and the second and third refining are carried out in a standing furnace.
3. The process for preparing an aluminum alloy profile according to claim 1, wherein during the casting process, a ceramic tool is used for slagging off during slagging off.
4. The process for preparing an aluminum alloy profile according to claim 1, wherein during the casting, a degassing tank is used for degassing the aluminum alloy melt, and argon or nitrogen is used as the protective gas.
5. The process for preparing an aluminum alloy profile according to claim 1, wherein the aluminum alloy melt is subjected to multistage filtration during casting, and the mesh number of the filter plates is 30-60 meshes.
6. The process as claimed in claim 1, wherein the step of casting is performed by casting molten aluminum alloy into a casting rod by hot-top casting, wherein the molten aluminum alloy is at a temperature of 680-720 ℃, a casting speed of 125-140mm/min, a cooling water pressure of 0.15-0.2MPa, and a cooling water temperature of 10-40 ℃.
7. The process for preparing an aluminum alloy profile according to claim 1, wherein the homogenizing step is performed for 30-40min of air cooling, 20-40min of mist cooling and 60-100min of water cooling.
8. The process for preparing an aluminum alloy profile according to claim 1, wherein the step of extruding is performed by heating the cast rod to 470-540 ℃ in an electromagnetic induction gradient heating manner, wherein the heating temperature of the front end of the cast rod is 520-540 ℃, and the heating gradient is greater than 0 ℃/cm and less than or equal to 1.5 ℃/cm.
9. The process for preparing an aluminum alloy profile according to claim 1, wherein the step of extrusion molding is performed such that the next cast bar is advanced by 10 to 60 seconds before the previous cast bar is extruded.
10. The process for preparing an aluminum alloy profile according to claim 1, wherein after the step of performing the extrusion molding and before the step of performing the solution quenching on the obtained profile, a stretcher is used to perform stretching and straightening treatment on the obtained profile, and during stretching, a profile contour block is placed in a cavity of the profile, and the stretching rate is 0.8-1.5%.
11. The aluminum alloy profile preparation process as claimed in claim 1, wherein the profile is cooled after aging treatment, and the cooling mode is one of air cooling, forced air cooling and water mist cooling.
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| CN114892048A (en) * | 2022-05-11 | 2022-08-12 | 四川越创铝业有限公司 | Preparation method of low-alloy-component high-strength aluminum alloy |
| CN115233055A (en) * | 2022-07-25 | 2022-10-25 | 安徽工业大学 | Aluminum extruded section convenient to recycle and preparation method thereof |
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