CN113337788A - Production method for improving quality of 6063 aluminum alloy cast rod - Google Patents
Production method for improving quality of 6063 aluminum alloy cast rod Download PDFInfo
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- CN113337788A CN113337788A CN202110515731.XA CN202110515731A CN113337788A CN 113337788 A CN113337788 A CN 113337788A CN 202110515731 A CN202110515731 A CN 202110515731A CN 113337788 A CN113337788 A CN 113337788A
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- C—CHEMISTRY; METALLURGY
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/003—Aluminium alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/119—Refining the metal by filtering
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- 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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- C—CHEMISTRY; METALLURGY
- 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
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
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- Materials Engineering (AREA)
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- Continuous Casting (AREA)
Abstract
A production method for improving the quality of a 6063 aluminum alloy cast rod comprises the following steps: melting and casting the raw material of the aluminum alloy cast rod at 750-760 ℃ in the presence of a melting agent to obtain a blank; carrying out homogenization treatment on the blank to obtain a homogenized blank, wherein the temperature of the homogenization treatment is 575-595 ℃; extruding the homogenized blank to obtain a primary section; quenching the primary section to obtain a semi-finished section; carrying out artificial aging on the semi-finished section to obtain a final section; the raw materials contain magnesium: 0.45-0.9 wt%; silicon: 0.2-0.6 wt%; the mass ratio of magnesium/silicon is 1.5-1.7. By controlling the ratio of magnesium to silicon, a small amount of excess silicon is generated, the corrosion resistance of the section can be improved, and the section can be brighter and is beneficial to producing materials with oxidation, coloring and electrophoresis.
Description
Technical Field
The application relates to a production method for improving the quality of a 6063 aluminum alloy cast rod.
Background
No matter GB/T3190 alloy or GB/T5237-93 alloy produced aiming at the structural door and window section bar in the AlMgSi series alloy is the 6063 alloy, the main components and the limited components of the alloy are defined in a clear range. Wherein the main components comprise 0.45-0.9 wt% of magnesium and 0.2-0.6 wt% of silicon; the other impurity elements (Cu, Mn, Cr, etc.) are less than 0.1 wt%. In the field of alloy synthesis, the above range is substantially very wide, and for different application fields and different technical index requirements of products, the above range gives great choice to meet the use requirements of different products. The existing parameter control is obviously not satisfactory when it is necessary to produce oxidic, coloured and electrophoretic materials.
Disclosure of Invention
In order to solve the problems, the application discloses a production method for improving the quality of a 6063 aluminum alloy cast rod, which comprises the following steps: melting and casting the raw material of the aluminum alloy cast rod at 750-760 ℃ in the presence of a melting agent to obtain a blank; carrying out homogenization treatment on the blank to obtain a homogenized blank, wherein the temperature of the homogenization treatment is 575-595 ℃; extruding the homogenized blank to obtain a primary section; quenching the primary section to obtain a semi-finished section; and (3) carrying out artificial aging on the semi-finished section to obtain the final section, wherein the magnesium in the raw materials is as follows: 0.45-0.9 wt%; silicon: 0.2-0.6 wt%; the mass ratio of magnesium/silicon is 1.5-1.7. By controlling the ratio of magnesium to silicon, a small amount of excess silicon is generated, so that the corrosion resistance of the section can be improved, and a material which is brighter and is beneficial to production of oxidation, coloring and electrophoresis can be obtained; as for the casting temperature, the casting temperature is controlled at 750-760 ℃, because the viscosity of the aluminum liquid is increased after the crystal grains are refined, and the aluminum liquid is easy to solidify and crystallize; a liquid-solid two-phase transition zone is arranged before crystallization, a narrower transition zone is arranged at high temperature, and the narrow transition zone is beneficial to the escape of gas discharged at the front edge of crystallization. However, the temperature must not be too high, which would shorten the effective time of the grain refiner, in which case the grains tend to grow and the material cannot be obtained for oxidation, coloration and electrophoresis.
Preferably, the smelting agent is a mixture of NaCl and NaF, and the mass of the NaCl and the NaF is 1: 5-7. This application adopts the mixture of NaCl and NaF to carry out better effect as the smelting agent to the meltwater of 6063 aluminum alloy, and slag removal, improvement aluminum alloy's quality are just relatively quick to the relative stability.
Preferably, in the process of smelting and casting the raw materials, nitrogen and a refining agent are adopted to carry out mixing powder injection and air injection refining at the temperature of 750-760 ℃, and in the process, degassing, deslagging and melt purification are carried out, and then the mixture is transferred into a standing furnace to stand for 30 minutes.
Preferably, two filter screens and a foamed ceramic filter plate are arranged between the crystallization plate and the furnace mouth during casting for filtering, the pore diameter of the filter plate is 30PPI, and the filter plate is filtered by 14-mesh glass fiber cloth before filtering.
Preferably, the homogenization treatment is carried out at the temperature of 540-550 ℃ for 3-4 hours, and the homogenization treatment is followed by cooling to room temperature at the cooling speed of 300-420 ℃/hour. In order to obtain aluminum alloy with relatively good quality, the over-sintering temperature is generally set at 575-595 ℃, but in the application, due to the existence of impurities, the over-sintering temperature is not a ternary system but a multiple system, and relatively low temperature is adopted to save energy and improve the production efficiency of the furnace on the premise of ensuring the quality; because the bonding force between solid atoms is large, the homogenization treatment is a process of diffusing alloy elements from grain boundaries (or edges) to the inside of the crystal at high temperature, and the process is slow, so that the homogenization time of coarse grains is much longer than that of fine grains; thus, the finer the grains, the shorter the homogenization time and the faster the cooling rate.
Preferably, in the casting process, turbulence and rolling-up generated in the flowing process of the aluminum liquid are avoided, tools are not needed to stir the aluminum liquid in the launder and the aluminum liquid in the diverter plate, and the aluminum liquid can stably flow into the crystallizer for crystallization under the protection of a surface oxidation film. When the method is used for production, the aluminum liquid is stirred and turned over by liquid flow, so that an oxide film on the surface of the aluminum liquid is broken to cause new oxidation, the oxide film is involved in the flowing aluminum liquid, the oxide film has extremely strong adsorption capacity and generally contains 2% of moisture, and when the oxide film is involved in the aluminum liquid, the moisture in the oxide film reacts with the aluminum liquid to cause hydrogen absorption and slag inclusion.
Preferably, the extrusion temperature is 460-.
Preferably, the mass ratio of zinc in the raw material is less than 0.05 wt%.
Preferably, the mass ratio of iron in the raw material is not higher than 0.25 wt%.
Preferably, the mass ratio of iron in the raw materialNot less than 0.1 wt%, zinc not less than 0.01 wt%, and strontium 0.03-0.05 wt%. Because a large amount of recycled waste aluminum or equal-outside aluminum is used in the casting at the present stage, Fe is easy to exceed the standard. There are two forms of Fe present in aluminum: a beta phase (Al) with needle structure9Fe2Si2) The other is alpha phase (Al) with granular structure12Fe3Si), the application has certain advantages for improving the strength of the aluminum alloy while reducing the harmful effect of Fe by adding strontium into the raw materials to convert the beta phase containing the iron element into the alpha phase.
This application can bring following beneficial effect:
1. by controlling the ratio of magnesium to silicon, a small amount of excess silicon is generated, so that the corrosion resistance of the section can be improved, and a material which is brighter and is beneficial to production of oxidation, coloring and electrophoresis is obtained;
2. the method has the advantages that the mixture of NaCl and NaF is used as the smelting agent, so that the melting liquid of 6063 aluminum alloy can be better acted, slag can be removed relatively stably and rapidly, and the quality of the aluminum alloy is improved;
3. the strontium is added into the raw materials, so that the beta phase containing the iron element is converted into the alpha phase, the harmful effect of Fe is reduced, and meanwhile, the strength of the aluminum alloy is improved to a certain extent.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present application will be explained in detail through the following embodiments.
Example 1:
a production method for improving the quality of a 6063 aluminum alloy cast rod comprises the following steps:
s1, melting and casting raw materials of an aluminum alloy casting rod at 750-760 ℃ in the presence of a melting agent to obtain a blank; the raw materials contain magnesium: 0.75 wt%; silicon: 0.5 wt%; the mass ratio of magnesium to silicon is 1.5-1.7; the mass ratio of zinc is 0.01 wt%; the mass ratio of the iron is 0.25 wt%, and the strontium accounts for 0.03 wt%.
The smelting agent is a mixture of NaCl and NaF, and the mass of the NaCl and the NaF is 1: 5;
the smelting and casting process comprises the following steps: melting the raw materials, transferring the raw materials into a standing furnace, mixing nitrogen and a refining agent, spraying powder, spraying gas, refining at the temperature of 750-. During casting, two filter screens and a foamed ceramic filter plate are arranged between the crystallization plate and the furnace mouth for filtering, the aperture of the filter plate is 30PPI, and the filter plate is filtered by 14-mesh glass fiber cloth before filtering. In the casting process, turbulence and rolling-up generated in the flowing process of the aluminum liquid are avoided, tools are not needed to stir the aluminum liquid in the launder and the aluminum liquid in the diverter plate, and the aluminum liquid can stably flow into the crystallizer for crystallization under the protection of the surface oxide film.
S2, carrying out homogenization treatment on the blank to obtain a homogenized blank, wherein the temperature of the homogenization treatment is 575-595 ℃; the homogenization treatment is to preserve heat for 5-7 hours at the temperature of 540-;
s3, extruding the homogenized blank to obtain a primary section; the extrusion temperature is 460-480 ℃;
s4, quenching the primary section to obtain a semi-finished section;
and S5, carrying out artificial aging on the semi-finished section to obtain a final section.
Example 2
A production method for improving the quality of a 6063 aluminum alloy cast rod comprises the following steps:
s1, melting and casting raw materials of an aluminum alloy casting rod at 750-760 ℃ in the presence of a melting agent to obtain a blank; the raw materials contain magnesium: 0.9 wt%; silicon: 0.53 wt%; the mass of the zinc accounts for 0.05 wt%; the mass ratio of the iron is 0.1 wt%, and the strontium accounts for 0.05 wt%.
The smelting agent is a mixture of NaCl and NaF, and the mass of the NaCl and the NaF is 1: 7;
the smelting and casting process comprises the following steps: in the process of smelting and casting the raw materials, nitrogen and a refining agent are adopted to carry out mixed powder spraying, and the air injection refining temperature is 750-; and (5) after full refining, transferring the mixture into a standing furnace for standing for 30 minutes. During casting, two filter screens and a foamed ceramic filter plate are arranged between the crystallization plate and the furnace mouth for filtering, the aperture of the filter plate is 30PPI, and the filter plate is filtered by 14-mesh glass fiber cloth before filtering. In the casting process, turbulence and rolling-up generated in the flowing process of the aluminum liquid are avoided, tools are not needed to stir the aluminum liquid in the launder and the aluminum liquid in the diverter plate, and the aluminum liquid can stably flow into the crystallizer for crystallization under the protection of the surface oxide film.
S2, carrying out homogenization treatment on the blank to obtain a homogenized blank, wherein the temperature of the homogenization treatment is 575-595 ℃; the homogenization treatment is to preserve heat for 5-7 hours at the temperature of 540-;
s3, extruding the homogenized blank to obtain a primary section; the extrusion temperature is 460-480 ℃;
s4, quenching the primary section to obtain a semi-finished section;
and S5, carrying out artificial aging on the semi-finished section to obtain a final section.
Comparative example 1
On the basis of example 2, strontium was not added.
Comparative example 2
The mass ratio of iron was 0.02 wt% based on example 2.
Comparative example 3
On the basis of example 2, the ratio of magnesium: 0.5 wt%; silicon: 0.5 wt%.
The tensile strength of the final product was determined:
| sample number | Tensile strength MPa |
| Example 1 | 246MPa |
| Practice ofExample 2 | 238MPa |
| Comparative example 1 | 168MPa |
| Comparative example 2 | 206MPa |
| Comparative example 3 | 198MPa |
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A production method for improving the quality of a 6063 aluminum alloy cast rod is characterized by comprising the following steps: the method comprises the following steps:
melting and casting the raw material of the aluminum alloy cast rod at 750-760 ℃ in the presence of a melting agent to obtain a blank;
carrying out homogenization treatment on the blank to obtain a homogenized blank, wherein the temperature of the homogenization treatment is 575-595 ℃;
extruding the homogenized blank to obtain a primary section;
quenching the primary section to obtain a semi-finished section;
carrying out artificial aging on the semi-finished section to obtain a final section;
the raw materials contain magnesium: 0.45-0.9 wt%; silicon: 0.2-0.6 wt%; the mass ratio of magnesium/silicon is 1.5-1.7.
2. The production method for improving the quality of a 6063 aluminum alloy cast rod according to claim 1, which is characterized in that: the smelting agent is a mixture of NaCl and NaF, and the mass of the NaCl and the NaF is 1: 5-7.
3. The production method for improving the quality of a 6063 aluminum alloy cast rod according to claim 1, which is characterized in that: in the process of smelting and casting raw materials, nitrogen and a refining agent are adopted to carry out mixing powder injection and air injection refining at the temperature of 750-.
4. The production method for improving the quality of a 6063 aluminum alloy cast rod according to claim 3, characterized in that: during casting, two filter screens and a foamed ceramic filter plate are arranged between the crystallization plate and the furnace mouth for filtering, the aperture of the filter plate is 30PPI, and the filter plate is filtered by 14-mesh glass fiber cloth before filtering.
5. The production method for improving the quality of a 6063 aluminum alloy cast rod according to claim 4, which is characterized in that: the homogenization treatment is to keep the temperature at 540-550 ℃ for 5-7 hours, and then cool the homogenization treatment to room temperature at the cooling speed of 300-420 ℃/hour.
6. The production method for improving the quality of a 6063 aluminum alloy cast rod according to claim 1, which is characterized in that: in the casting process, turbulence and rolling-up generated in the flowing process of the aluminum liquid are avoided, tools are not needed to stir the aluminum liquid in the launder and the aluminum liquid in the diverter plate, and the aluminum liquid can stably flow into the crystallizer for crystallization under the protection of the surface oxide film.
7. The production method for improving the quality of a 6063 aluminum alloy cast rod according to claim 1, which is characterized in that: the extrusion temperature is 460-480 ℃.
8. The production method for improving the quality of a 6063 aluminum alloy cast rod according to claim 1, which is characterized in that: the mass ratio of zinc in the raw materials is less than 0.05 wt%.
9. The production method for improving the quality of a 6063 aluminum alloy cast rod according to claim 8, wherein the production method comprises the following steps: the mass ratio of iron in the raw materials is not higher than 0.25 wt%.
10. The production method for improving the quality of a 6063 aluminum alloy cast rod according to claim 9, which is characterized in that: the mass ratio of iron in the raw materials is not less than 0.1 wt%, the mass ratio of zinc is not less than 0.01 wt%, and the raw materials also comprise 0.03-0.05 wt% of strontium.
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| CN202110515731.XA CN113337788A (en) | 2021-05-12 | 2021-05-12 | Production method for improving quality of 6063 aluminum alloy cast rod |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115927930A (en) * | 2022-12-15 | 2023-04-07 | 东莞市铝美铝型材有限公司 | High-strength aluminum alloy section processing technology |
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2021
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