CN113249622A - Production process of high-glossiness extruded aluminum profile and extruded aluminum profile - Google Patents
Production process of high-glossiness extruded aluminum profile and extruded aluminum profile Download PDFInfo
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- CN113249622A CN113249622A CN202010213489.6A CN202010213489A CN113249622A CN 113249622 A CN113249622 A CN 113249622A CN 202010213489 A CN202010213489 A CN 202010213489A CN 113249622 A CN113249622 A CN 113249622A
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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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- 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
- 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 discloses a production process of a high-glossiness extruded aluminum profile, which is characterized by comprising the following steps of: preparing an aluminum alloy ingot, homogenizing, brushing a rod, extruding and forming, correcting, aging and the like. Compared with the prior art, the invention ensures that fine impurities in the aluminum alloy in the smelting stage are removed as clean as possible by adjusting the alloy components and the smelting process, so that the surface glossiness of the aluminum alloy is high after extrusion forming, and the surface effect similar to that after polishing is achieved. Therefore, the subsequent polishing process is directly omitted, the production cost can be greatly reduced, the environmental pollution can be reduced, and the product delivery is accelerated. Through practical tests, the glossiness of the extruded aluminum profile blank prepared by the method reaches 750-900 GU and exceeds that of most mechanically polished extruded aluminum profile blanks measured by a 60-degree glossiness instrument; the glossiness of the extruded aluminum profile blank can still reach more than 500GU after the extruded aluminum profile blank is oxidized by AA 5. The invention also provides an extruded aluminum profile.
Description
Technical Field
The invention relates to the field of high-glossiness aluminum alloy profiles, in particular to a production process of a high-glossiness extruded aluminum profile and an extruded aluminum profile.
Background
With the increasing surface requirements of aluminum profiles, many aluminum profiles need to have high glossiness and high brightness effects of surface polishing, so that high-grade and attractive requirements are met. However, in the prior art, certain foreign elements such as V, Ga exist in the aluminum alloy in the stage of preparing the aluminum ingot by electrolysis due to impurities in bauxite, and the elements form fine inclusion residues after the aluminum ingot is cast, and finally the foreign elements are remained all the time as the aluminum ingot is melted and cast into an aluminum rod. In the process of extruding an aluminum bar into an aluminum profile, because metal needs to rub with a die working tape, the fine impurities can be adhered to the die working tape, so that fine grains appear on the surface of the extruded profile, and meanwhile, the fine impurities can also be adhered to the surface of the profile in the extruding process, so that the surface glossiness of the profile is reduced. And if the glossiness of the profile is improved, polishing treatment is required.
The aluminum profile polishing process is generally divided into two types, i.e., mechanical polishing and chemical polishing. Wherein, the mechanical polishing removes the surface lines by the repeated grinding of a grinding wheel, a cloth wheel and the like, thereby achieving the effect of a mirror surface. However, mechanical polishing wastes time and labor, a polishing process for multiple times for a long time is needed to achieve high glossiness, fine aluminum ash powder can be generated in the polishing and polishing process, explosive potential safety hazards exist, and the aluminum ash powder can easily enter a human body to cause occupational disease injury. The chemical polishing is generally triacid polishing, but the nitric acid is decomposed too fast, a large amount of yellow smoke is generated, the pollution is serious, the treatment cost is high, the environmental pollution is serious, the treatment process is classified as a treatment process prohibited to be used in most areas, and the glossiness is improved after the triacid polishing, but the extrusion lines are more obvious, and the appearance quality of the aluminum profile is seriously influenced. Other polishing methods have been developed, but they have problems of high cost or poor effect.
Disclosure of Invention
In view of the problems in the prior art, an object of the present invention is to provide a process for producing an extruded aluminum profile having high gloss directly after molding without additional polishing.
The invention also aims to provide an extruded aluminum profile prepared by the production process.
In order to achieve the purpose, the invention adopts the following technical scheme.
A production process of an extruded aluminum profile with high glossiness is characterized by comprising the following steps: 1) preparing an aluminum alloy ingot, adding the prepared aluminum alloy raw material into a smelting furnace to be melted into molten aluminum, uniformly stirring, refining and degassing by using a refining agent, standing for a period of time, filtering impurities in the molten aluminum, and casting the molten aluminum into the aluminum alloy ingot; the aluminum alloy is prepared from the following raw materials in parts by weight: si: 0.30-0.42%, Fe: less than or equal to 0.12 percent, Cu:0.01 to 0.03%, Mn: less than or equal to 0.005 percent, Mg: 0.45-0.58%, Zn: less than or equal to 0.03%, B: 0.03-0.08%, Ti: less than or equal to 0.005 percent, less than or equal to 0.01 percent of single impurity, less than or equal to 0.05 percent of impurity in total, and the balance of Al with the purity of more than or equal to 99.8 percent; 2) homogenizing, namely homogenizing the cast aluminum alloy ingot for a period of time, and cooling; 3) a brush bar, wherein the surface of the homogenized aluminum alloy cast ingot is subjected to brush bar or peeling treatment to remove part of the surface of the aluminum alloy cast ingot; 4) extruding and forming, namely heating the brush rod or the peeled aluminum alloy cast ingot in a head-to-tail sectional manner, and then putting the heated brush rod or the peeled aluminum alloy cast ingot into an extrusion cylinder of an extruder for extrusion to obtain an extruded section product; 5) straightening, wherein the extruded section product is straightened after being cooled, and the straightening amount is less than or equal to 0.3 percent; 6) and (4) aging treatment, namely performing artificial aging on the extruded section.
More preferably, in the step 1), the stirring is performed by an electromagnetic stirring device.
More preferably, in the step 1), the refining agent is used for refining and degassing, and then the mixture is left to stand for 30 to 60 minutes to precipitate impurities.
More preferably, in the step 1), the filtering is performed by a 40-60 mesh ceramic filter plate.
More preferably, in the step 2), the homogenization conditions are: the temperature is 540-560 ℃, the time is 4-6 h, and the mixture is cooled by using an air cooling or air cooling mode after homogenization treatment.
More preferably, in the step 3), the brush bar or the peeling is to remove the surface skin of the aluminum alloy ingot by using a high-speed rotating steel wire brush, and the removing amount is 0.1-0.2 mm.
More preferably, in the step 4), the temperatures for head-to-tail heating are respectively as follows: the temperature of the rod head is 440-500 ℃, the temperature of the rod middle is 430-490 ℃, and the temperature of the rod tail is 420-480 ℃; the extrusion speed of the extruded section bar product is 6-15 m/min, and the temperature of the extruded ingot containing barrel is controlled at 420-480 ℃.
More preferably, in the step 4), the extruded profile product obtained by extrusion is cooled by using a variable frequency fan.
More preferably, in the step 6), the aging temperature is 180-200 ℃, and the aging heat preservation time is 3-5 h.
An extruded aluminium profile, characterized in that it is produced by a process according to any one of claims 1 to 9.
Compared with the prior art, the invention has the beneficial effects that:
by adjusting the alloy components and the smelting process, fine inclusions in the aluminum alloy in the smelting stage are removed as clean as possible, so that the surface glossiness of the aluminum alloy is high after extrusion forming, and the surface effect similar to that after polishing is achieved. Therefore, the subsequent polishing process is directly omitted, the production cost can be greatly reduced, the environmental pollution can be reduced, and the product delivery is accelerated. Through practical tests, the glossiness of the extruded aluminum profile blank prepared by the method reaches 750-900 GU and exceeds that of most mechanically polished extruded aluminum profile blanks measured by a 60-degree glossiness instrument; the glossiness of the extruded aluminum profile blank can still reach more than 500GU after the extruded aluminum profile blank is oxidized by AA 5.
Detailed Description
The following further describes the embodiments of the present invention, so that the technical solutions and the advantages thereof of the present invention are more clear and definite. The following description of the embodiments is exemplary in nature and is in no way intended to limit the invention.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Example 1
A production process of a high-glossiness extruded aluminum profile is characterized in that fine inclusions in an aluminum alloy in a smelting stage are removed as clean as possible by adjusting alloy components and a smelting process, so that the surface glossiness of the aluminum alloy is high after extrusion forming, and a surface effect similar to that after polishing is achieved.
The method is realized by the following steps:
1) preparing the aluminum alloy according to the following weight part ratio: 0.30-0.42% of Si, less than or equal to 0.12% of Fe, 0.01-0.03% of Cu, Mn: less than or equal to 0.005 percent, Mg: 0.45-0.58%, Zn: less than or equal to 0.03%, B: 0.03-0.08%, Ti: less than or equal to 0.005 percent, less than or equal to 0.01 percent of single impurity, less than or equal to 0.05 percent of impurity in total, and the balance of Al. The method comprises the following steps of preparing an aluminum alloy raw material, adding the prepared aluminum alloy raw material into a smelting furnace to be melted into molten aluminum, uniformly stirring the molten aluminum by using an electromagnetic stirring device, standing the molten aluminum for 30-60 minutes to precipitate impurities after refining and degassing by using a refining agent, filtering the residual impurities in the molten aluminum by using a 40-60-mesh ceramic filter plate, and casting the molten aluminum into an aluminum alloy ingot. Here, the purpose of the standing treatment is to cause impurity components in the molten aluminum to react with B sufficiently to form a heavy impurity polymer, and to precipitate to the bottom during the standing.
2) Homogenizing the cast aluminum alloy ingot at 540-560 ℃ for 4-6 h, and cooling by air cooling or air cooling after homogenizing. The purpose of the homogenization treatment is to eliminate the microsegregation of the ingot, to uniformly distribute various solute elements inside the crystal, and to spheroidize the iron phase.
3) And (3) treating the surface of the homogenized aluminum alloy cast ingot by using a steel wire brush high-speed rotating brush rod, and ensuring that the removal amount is 0.1-0.2 mm. The method aims to remove dust and impurities adhered to the surface of the aluminum bar, remove part of segregation layers and slight segregation nodules of the surface, and reduce the defect that the surface of the section bar is deeply lined or the glossiness of the section bar is reduced due to the fact that the impurities of the segregation layers on the surface are rolled in the extrusion process.
4) Carrying out head-to-tail segmented heating on the aluminum alloy cast ingot subjected to rod brushing, wherein the temperatures are respectively 440-500 ℃ for the rod head, 430-490 ℃ for the rod middle temperature and 420-480 ℃ for the rod tail; and then putting the mixture into an extrusion cylinder of an extruder for extrusion, wherein the extrusion speed of the product is 6-15 m/min, and the temperature of the extrusion ingot-containing cylinder is controlled at 420-480 ℃. The purpose is to reduce involving in of ingot casting surface segregation layer impurity in extrusion process, uses the frequency conversion fan to carry out cooling treatment after the extrusion, can not avoid appearing the watermark and influence surface gloss degree with water spray treatment.
5) And (3) cooling the extruded profile product, correcting the extruded profile product to a correction amount of less than or equal to 0.3%, eliminating the bending and twisting defects of the product, wherein the correction amount must be controlled, and avoiding the influence on glossiness caused by the orange peel defect on the surface of the profile due to overlong correction length.
6) And (3) carrying out artificial aging on the extruded section, wherein the aging temperature is 180-200 ℃, and the aging heat preservation time is 3-5 h.
Through practical tests, the glossiness of the extruded aluminum profile blank produced by the processing method is measured by using a 60-degree glossiness instrument, reaches 750-900 GU and exceeds the glossiness of most mechanically polished aluminum profile blanks. After the extruded aluminum profile blank is oxidized by AA5, the glossiness can still reach more than 500GU without additional polishing.
Example 2
An extruded aluminium profile, characterised by being produced using the production process as described in example 1. This embodiment provides an extruded aluminum profile, which has all the technical effects of embodiment 1, and will not be described herein again.
It will be appreciated by those skilled in the art from the foregoing description of construction and principles that the invention is not limited to the specific embodiments described above, and that modifications and substitutions based on the teachings of the art may be made without departing from the scope of the invention as defined by the appended claims and their equivalents. The details not described in the detailed description are prior art or common general knowledge.
Claims (10)
1. A production process of an extruded aluminum profile with high glossiness is characterized by comprising the following steps:
1) preparing an aluminum alloy ingot, adding the prepared aluminum alloy raw material into a smelting furnace to be melted into molten aluminum, uniformly stirring, refining and degassing by using a refining agent, standing for a period of time, filtering impurities in the molten aluminum, and casting the molten aluminum into the aluminum alloy ingot;
the aluminum alloy is prepared from the following raw materials in parts by weight: si: 0.30-0.42%, Fe: less than or equal to 0.12 percent, Cu:0.01 to 0.03%, Mn: less than or equal to 0.005 percent, Mg: 0.45-0.58%, Zn: less than or equal to 0.03%, B: 0.03-0.08%, Ti: less than or equal to 0.005 percent, less than or equal to 0.01 percent of single impurity, less than or equal to 0.05 percent of impurity in total, and the balance of Al with the purity of more than or equal to 99.8 percent;
2) homogenizing, namely homogenizing the cast aluminum alloy ingot for a period of time, and cooling;
3) a brush bar, wherein the surface of the homogenized aluminum alloy cast ingot is subjected to brush bar or peeling treatment to remove part of the surface of the aluminum alloy cast ingot;
4) extruding and forming, namely heating the brush rod or the peeled aluminum alloy cast ingot in a head-to-tail sectional manner, and then putting the heated brush rod or the peeled aluminum alloy cast ingot into an extrusion cylinder of an extruder for extrusion to obtain an extruded section product;
5) straightening, wherein the extruded section product is straightened after being cooled, and the straightening amount is less than or equal to 0.3 percent;
6) and (4) aging treatment, namely performing artificial aging on the extruded section.
2. A process for the production of a high gloss extruded aluminium profile according to claim 1, wherein in step 1) the stirring is achieved by means of an electromagnetic stirring device.
3. The process for producing a high gloss extruded aluminum profile according to claim 1, wherein in the step 1), the aluminum profile is refined and degassed by using a refining agent, and then is left for 30-60 minutes to precipitate impurities.
4. The process for producing a high gloss extruded aluminum profile according to claim 1, wherein in step 1), the filtration is performed by a 40-60 mesh ceramic filter plate.
5. A process for the production of a high gloss extruded aluminium profile according to claim 1, wherein in step 2) the homogenization conditions are: the temperature is 540-560 ℃, the time is 4-6 h, and the mixture is cooled by using an air cooling or air cooling mode after homogenization treatment.
6. The process for producing a high gloss extruded aluminum profile according to claim 1, wherein in the step 3), the brush bar or peeling is performed by removing the surface skin of the aluminum alloy ingot by a high speed rotating wire brush, and the removing amount is 0.1-0.2 mm.
7. The process for producing high gloss extruded aluminum profile according to claim 1, wherein in the step 4), the temperatures for heating in the head-to-tail section are respectively: the temperature of the rod head is 440-500 ℃, the temperature of the rod middle is 430-490 ℃, and the temperature of the rod tail is 420-480 ℃; the extrusion speed of the extruded section bar product is 6-15 m/min, and the temperature of the extruded ingot containing barrel is controlled at 420-480 ℃.
8. The process for producing a high gloss extruded aluminum profile according to claim 1, wherein in the step 4), the extruded profile product obtained by extrusion is cooled by a variable frequency fan.
9. The process for producing a high-gloss extruded aluminum profile according to claim 1, wherein in the step 6), the aging temperature is 180-200 ℃ and the aging holding time is 3-5 h.
10. An extruded aluminium profile, characterized in that it is produced by a process according to any one of claims 1 to 9.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114700683A (en) * | 2021-11-26 | 2022-07-05 | 江苏伟业铝材有限公司 | Method for preparing aluminum alloy section |
| CN114717493A (en) * | 2022-04-21 | 2022-07-08 | 广东澳美铝业有限公司 | Pre-aging method for extruded aluminum profile and pre-aging aluminum profile extrusion production line |
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| CN114700683A (en) * | 2021-11-26 | 2022-07-05 | 江苏伟业铝材有限公司 | Method for preparing aluminum alloy section |
| CN114717493A (en) * | 2022-04-21 | 2022-07-08 | 广东澳美铝业有限公司 | Pre-aging method for extruded aluminum profile and pre-aging aluminum profile extrusion production line |
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