CN112430760A - Manufacturing method of luggage rack - Google Patents
Manufacturing method of luggage rack Download PDFInfo
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- CN112430760A CN112430760A CN202011302339.9A CN202011302339A CN112430760A CN 112430760 A CN112430760 A CN 112430760A CN 202011302339 A CN202011302339 A CN 202011302339A CN 112430760 A CN112430760 A CN 112430760A
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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
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B21/00—Obtaining aluminium
- C22B21/06—Obtaining aluminium refining
- C22B21/066—Treatment of circulating aluminium, e.g. by filtration
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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
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Abstract
The invention discloses a manufacturing method of a luggage rack, which comprises the following steps: casting: deslagging the refined aluminum liquid by sequentially passing through a first plate filter with filtering precision of 40-60 meshes and a second plate filter with filtering precision of 50-80 meshes; adding 1.2 to 1.6 weight percent of aluminum-titanium-boron alloy refiner into the aluminum liquid after deslagging; sequentially standing and casting the aluminum liquid added with the aluminum-titanium-boron alloy refiner to obtain an alloy ingot; homogenizing the alloy cast ingot: heating the alloy cast ingot to 530-550 ℃, preserving heat for 4-9 h at 530-550 ℃, and cooling by water mist after heat preservation is finished to obtain the aluminum bar with the grain size of 70-100 mu m. S2: the luggage rack is obtained according to the aluminum bar with the grain size of 70-100 mu m. The invention can solve the problem that the surface of the aluminum profile is easy to wrinkle after stretch bending.
Description
Technical Field
The invention relates to the technical field of sectional materials, in particular to a manufacturing method of a luggage rack.
Background
With the improvement of living standard and aesthetic examination of people, the requirements of people on the appearance and the like of vehicles are higher and higher, and the roof rack not only serves as an appearance decoration piece, but also serves as a bearing frame of a roof during traveling, and is particularly applied to middle-high-grade automobiles.
Aluminum and aluminum alloys are one of the more widely used light metals in nonferrous metals. It has low density, light weight, high plasticity and high corrosion resistance. Aluminum alloys can be classified into two major categories, wrought aluminum alloys and cast aluminum alloys, according to alloying elements and processing characteristics.
The surface of the existing aluminum profile after stretch bending has large-area uneven wrinkling, and the wrinkling on the surface of the aluminum profile cannot be removed through robot polishing, so that the surface of the aluminum profile after anodic oxidation has wrinkling, the fineness is poor, and the appearance of the product is poor. In the prior art, the wrinkles on the outer surface layer of the aluminum profile are removed by using sand paper, and then the aluminum profile is polished by a robot, so that a better oxidized appearance can be obtained, but the aluminum profile obtained by the method is not bright after being anodized, the production efficiency of the method is low, and the phenomenon of energy waste exists.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a manufacturing method of a luggage rack, which solves the problem that the surface of an aluminum profile is wrinkled after being stretch-bent.
In order to solve the technical problems, the invention adopts the technical scheme that:
a method of manufacturing a roof rack comprising the steps of:
s1: casting: deslagging the refined aluminum liquid by sequentially passing through a first plate filter with filtering precision of 40-60 meshes and a second plate filter with filtering precision of 50-80 meshes;
adding 1.2 to 1.6 weight percent of aluminum-titanium-boron alloy refiner into the aluminum liquid after deslagging;
sequentially standing and casting the aluminum liquid added with the aluminum-titanium-boron alloy refiner to obtain an alloy ingot;
homogenizing the alloy cast ingot: heating the alloy cast ingot to 530-550 ℃, preserving heat for 4-9 h at 530-550 ℃, and cooling with water mist after heat preservation to obtain an aluminum bar with the grain size of 70-100 mu m;
s2: the luggage rack is obtained according to the aluminum bar with the grain size of 70-100 mu m.
The invention has the beneficial effects that: in the invention, two plate filters with different filtering precisions are arranged for deslagging, so that the purity precision of the filtered aluminum liquid is higher; the crystal grains of the alloy ingot can be greatly reduced by optimizing the homogenization treatment condition of the aluminum ingot to 530-550 ℃ and preserving the heat for 4-9 h, so that an aluminum bar with lower grain size can be obtained; the aluminum profile obtained by thinning the aluminum bar with the grain size of 70-100 mu m has fine and uniform particles on the surfaces of two ends after stretch bending, namely the wrinkling phenomenon is improved. The invention can improve the surface wrinkling phenomenon of the aluminum profile after stretch bending, thereby improving the appearance of the aluminum profile product, enabling the manufactured aluminum profile to meet the requirements of a luggage rack and improving the product yield.
Drawings
FIG. 1 is a cross-sectional view of a roof rack of the present invention;
FIG. 2 is a schematic diagram of an uneven corrugated structure state of two ends of an aluminum profile;
FIG. 3 is a schematic view of an organization state of the luggage rack of the present invention with two uniformly corrugated ends.
Description of reference numerals:
1. an outer surface; 2. a central portion; 3. an inner surface.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
A method of manufacturing a roof rack comprising the steps of:
s1: casting: deslagging the refined aluminum liquid by sequentially passing through a first plate filter with filtering precision of 40-60 meshes and a second plate filter with filtering precision of 50-80 meshes;
adding 1.2 to 1.6 weight percent of aluminum-titanium-boron alloy refiner into the aluminum liquid after deslagging;
sequentially standing and casting the aluminum liquid added with the aluminum-titanium-boron alloy refiner to obtain an alloy ingot;
homogenizing the alloy cast ingot: heating the alloy cast ingot to 530-550 ℃, preserving heat for 4-9 h at 530-550 ℃, and cooling by water mist after heat preservation is finished to obtain the aluminum bar with the grain size of 70-100 mu m.
S2: the luggage rack is obtained according to the aluminum bar with the grain size of 70-100 mu m.
The working principle of the invention is as follows:
the high-purity aluminum liquid is utilized, the feeding amount of aluminum, titanium and boron is increased to reduce the grain size of the aluminum bar, the homogenization condition of the aluminum bar is improved, the aluminum bar with fine surface and small grain size can be obtained, and the phenomenon that two ends of the section are wrinkled after the section is stretch-bent is obviously improved by reducing the grain size of the aluminum bar.
From the above description, the beneficial effects of the present invention are: in the invention, two plate filters with different filtering precisions are arranged for deslagging, so that the purity precision of the filtered aluminum liquid is higher; the crystal grains of the alloy ingot can be greatly reduced by optimizing the homogenization treatment condition of the aluminum ingot to 530-550 ℃ and preserving the heat for 4-9 h, so that an aluminum bar with lower grain size can be obtained; the aluminum profile obtained by thinning the aluminum bar with the grain size of 70-100 mu m has fine and uniform particles on the surfaces of two ends after stretch bending, namely the wrinkling phenomenon is improved. The invention can improve the surface wrinkling phenomenon of the aluminum profile after stretch bending, thereby improving the appearance of the aluminum profile product, enabling the manufactured aluminum profile to meet the requirements of a luggage rack and improving the product yield.
A method of manufacturing a roof rack comprising the steps of:
s1: casting: deslagging the refined aluminum liquid by sequentially passing through a first plate filter with filtering precision of 40-60 meshes and a second plate filter with filtering precision of 50-80 meshes;
adding 1.2 to 1.6 weight percent of aluminum-titanium-boron alloy refiner into the aluminum liquid after deslagging;
sequentially standing and casting the aluminum liquid added with the aluminum-titanium-boron alloy refiner to obtain an alloy ingot;
homogenizing the alloy cast ingot: heating the alloy cast ingot to 530-550 ℃, preserving heat for 4-9 h at 530-550 ℃, and cooling with water mist after heat preservation to obtain an aluminum bar with the grain size of 70-100 mu m;
s2: the luggage rack is obtained according to the aluminum bar with the grain size of 70-100 mu m.
Further, the S2 further includes S21: extrusion molding: heating an extrusion die to 450-500 ℃ and preserving heat, heating an aluminum bar to 460-510 ℃, sending the heated aluminum bar into a ingot containing cylinder, extruding the aluminum bar from the extrusion die through an extrusion rod to obtain an aluminum profile, wherein the temperature of an extrusion opening is 500-550 ℃, and the extrusion speed is 3.0-4.2 mm/s;
air cooling the aluminum profile until the temperature is lower than 200 ℃, and air cooling, straightening, sawing and aging the aluminum profile.
From the above description, the air cooling process of the aluminum profile in the process of extruding the aluminum profile can obviously improve the surface wrinkling phenomenon of the aluminum profile after stretch bending.
Further, the step S21 specifically includes:
after the aluminum profile is air-cooled until the temperature is lower than 200 ℃, feeding the aluminum profile into a cooling bed, and after the aluminum profile is air-cooled by the cooling bed, straightening the aluminum profile at the temperature lower than 55 ℃;
and sawing the cooled aluminum profile, and putting the aluminum profile into a turnover vehicle to age the sawed aluminum profile, wherein the temperature of the aged aluminum profile is 100-200 ℃, and the time of the aged aluminum profile is 2-8 h.
Further, the method also comprises the step of S22: forming an aluminum profile: and (3) stretch bending and forming the aluminum profile in bending equipment, wherein the bending force value is 20000N-36000N.
From the above description, under the bending force value condition, the radian requirement of the aluminum profile can be met.
Further, the method also comprises the step of S23: polishing: and polishing the surface of the aluminum profile by a robot.
According to the above description, the robot is used for polishing the surface of the aluminum profile, so that the labor force can be reduced, the phenomenon that two end heads wrinkle after the aluminum profile is subjected to stretch bending is reduced, the manual polishing process is saved, and the labor cost is reduced.
Further, the method also comprises the step of S24: anodic oxidation: the alkali washing time in the anodic oxidation process is 50-120 s; the pickling time is 240-420 s.
From the above description, it can be known that the improvement of the alkali washing time and the acid washing time in the anodic oxidation process can greatly improve the transparency of the product.
Further, the specific steps in S24 include:
degreasing, electrochemical polishing, alkali washing, acid washing and electrolytic oxidation.
Further, in the step S24, degreasing is carried out at the temperature of 40-70 ℃, and the treatment time is 180-480S; the electrochemical polishing is carried out under the condition that the voltage is 20V-40V, and the processing time is 600 s-2100 s; performing alkali washing at the temperature of 20-35 ℃ for 50-120 s; acid washing is carried out at the temperature of 20-35 ℃, and the treatment time is 60-360 s; the electrolytic oxidation is carried out under the condition that the voltage is 12V-18V, and the treatment time is 600 s-2100 s.
As is clear from the above description, the surface of the aluminum bar obtained by anodizing under the above conditions has the best surface transparency.
The composition of the aluminum liquid in the invention is the same as the national standard of 6063 aluminum alloy, and it is noted that the surface wrinkling phenomenon in the invention refers to the uneven particle or strip-shaped rough particle distribution state appearing on the outer surface 1 of two ends of the aluminum profile after stretch bending.
The invention is suitable for manufacturing various aluminum profiles, in particular to an automobile luggage rack.
A method of manufacturing a roof rack comprising the steps of:
s1: casting: slagging off, component adjustment and refining are sequentially carried out on the aluminum liquid;
the refined aluminum liquid is sequentially subjected to deslagging through a first plate filter of 40-60 meshes and a second plate filter of 50-80 meshes;
adding 1.2 to 1.6 weight percent of aluminum-titanium-boron alloy refiner into the aluminum liquid after deslagging;
injecting the aluminum liquid added with the aluminum-titanium-boron alloy refiner into a standing furnace for standing;
introducing the aluminum liquid after standing into a casting furnace for casting to obtain an alloy ingot;
homogenizing the alloy cast ingot, namely heating the alloy cast ingot to 530-550 ℃, preserving the heat for 4-9 h at 530-550 ℃, and cooling by water mist after the heat preservation is finished to obtain an aluminum bar with the grain size of 70-100 mu m; removing the outer skin of the aluminum bar by sawing;
s2: the luggage rack is obtained according to the aluminum bar with the grain size of 70-100 mu m.
Specifically, S2 further includes:
s21: extrusion molding: heating an extrusion die to 450-500 ℃ and preserving heat, heating an aluminum bar to 460-510 ℃, sending the heated aluminum bar into a ingot containing cylinder, extruding the aluminum bar from the extrusion die through an extrusion rod to obtain an aluminum profile, wherein the temperature of an extrusion opening is 500-550 ℃, and the extrusion speed is 3.0-4.2 mm/s;
air cooling the aluminum profile, wherein in the air cooling process, the opening of a fan is controlled to be 30-50% until the temperature is lower than 200 ℃, and the aluminum profile is sent into a cooling bed for air cooling, and then is straightened when the temperature is lower than 55 ℃;
and sawing the cooled aluminum profile, and putting the aluminum profile into a turnover vehicle to age the sawed aluminum profile, wherein the temperature of the aged aluminum profile is 100-200 ℃, and the time of the aged aluminum profile is 2-8 h.
S22: forming an aluminum profile: the aluminum profile is formed in a bending device in a stretch bending mode, and the bending force value is 20000N-36000N;
s23: polishing: polishing the surface of the aluminum profile by a robot;
s24: anodic oxidation: the alkali washing time in the anodic oxidation process is 50-120 s; the pickling time is 240-420 s.
Further, in the step S24, hanging, degreasing, electrochemical polishing, alkali washing, acid washing, electrolytic oxidation, and hole sealing are sequentially performed.
Further, in the step S24, degreasing is carried out at the temperature of 40-70 ℃, and the treatment time is 180-480S; the electrochemical polishing is carried out under the condition that the voltage is 20V-40V, and the processing time is 600 s-2100 s; performing alkali washing at the temperature of 20-35 ℃ for 50-120 s; acid washing is carried out at the temperature of 20-35 ℃, and the treatment time is 60-360 s; the electrolytic oxidation is carried out under the condition that the voltage is 12V-18V, and the treatment time is 600 s-2100 s.
Example one
A method of manufacturing a roof rack comprising the steps of:
s1: casting: slagging off, component adjustment and refining are sequentially carried out on the aluminum liquid;
the refined aluminum liquid is sequentially subjected to deslagging through a first plate filter of 40 meshes and a second plate filter of 60 meshes;
adding 1.3 percent by weight of aluminum-titanium-boron alloy refiner into the molten aluminum after deslagging;
injecting the aluminum liquid added with the aluminum-titanium-boron alloy refiner into a standing furnace for standing;
introducing the aluminum liquid after standing into a casting furnace for casting to obtain an alloy ingot;
homogenizing the alloy cast ingot, namely heating the alloy cast ingot to 550 ℃, preserving heat for 5 hours at 550 ℃, and cooling by water mist after heat preservation is finished to obtain an aluminum bar with the grain size of 70-100 mu m; removing the outer skin of the aluminum bar by sawing;
s2: the luggage rack is obtained according to the aluminum bar with the grain size of 70-100 mu m.
Specifically, S2 further includes:
s21: heating an extrusion die to 480 ℃ and preserving heat, heating an aluminum bar to 490 ℃, sending the heated aluminum bar into a ingot containing barrel, extruding the aluminum bar from the extrusion die through an extrusion rod to obtain an aluminum profile, wherein the temperature of an extrusion opening is 520 ℃, and the extrusion speed is 3.8 mm/s;
air cooling the aluminum profile until the temperature is lower than 200 ℃, feeding the aluminum profile into a cooling bed, and straightening the aluminum profile when the temperature is lower than 55 ℃ after the aluminum profile is air cooled by the cooling bed;
and sawing the cooled aluminum profile, and putting the aluminum profile into a turnover vehicle to age the sawed aluminum profile, wherein the aging heat preservation temperature is 170 ℃, and the heat preservation time is 6 h.
S22: forming an aluminum profile: the aluminum profile is subjected to stretch bending forming in bending equipment, and the bending force value is 32000N;
s23: polishing: polishing the surface of the aluminum profile by a robot;
s24: anodic oxidation: degreasing in the anodic oxidation process at the temperature of 60 ℃ for 300 s; the electrochemical polishing is carried out under the condition that the voltage is 35V, and the processing time is 1500 s; performing alkali washing at 25 ℃ for 60 s; acid washing is carried out at the temperature of 25 ℃ for 360 s; the electrolytic oxidation is carried out under the condition that the voltage is 15V, and the treatment time is 1600 s; the oxide film hole generated after oxidation is processed by special sealing treatment.
In this embodiment, the surfaces of the two ends of the aluminum profile after stretch bending are provided with fine uniform particles, and the fine uniform particles are easier to remove than non-uniform particles, so that the wrinkling phenomenon of the surfaces of the two ends can be effectively removed after the aluminum profile is polished by a robot.
Referring to fig. 1 to 3, metallographic analysis was performed on the product manufactured according to the present example (both end surfaces were uniformly wrinkled) and the product having both end surfaces were not uniformly wrinkled, respectively, and the data of the two products were compared to obtain the following tables:
TABLE 1
From table 1 it can be obtained: the product manufactured by the embodiment has smaller surface grain size, and compared with the product with uneven wrinkling at two ends, the grain size of the central part 2 tends to be obviously reduced, so the structure uniformity and the grain size of the section are beneficial to improving and even eliminating the surface wrinkling phenomenon after the aluminum section is bent.
It is to be noted that in both fig. 2 and 3, the grain size distribution at each position is arranged in the order of the outer surface 1, the central portion 2, and the inner surface 3.
Example two
A method of manufacturing a roof rack comprising the steps of:
s1: casting: slagging off, component adjustment and refining are sequentially carried out on the aluminum liquid;
the refined aluminum liquid is sequentially subjected to deslagging through a first plate filter of 40 meshes and a second plate filter of 60 meshes;
adding 1.4 wt% of aluminum-titanium-boron alloy refiner into the aluminum liquid after deslagging;
injecting the aluminum liquid added with the aluminum-titanium-boron alloy refiner into a standing furnace for standing;
introducing the aluminum liquid after standing into a casting furnace for casting to obtain an alloy ingot;
homogenizing the alloy cast ingot, namely heating the alloy cast ingot to 540 ℃, preserving heat for 7 hours at 540 ℃, and cooling by water mist after heat preservation is finished to obtain an aluminum bar with the grain size of 70-100 mu m; removing the outer skin of the aluminum bar by sawing;
s2: the luggage rack is obtained according to the aluminum bar with the grain size of 70-100 mu m.
Specifically, S2 further includes:
s21: heating an extrusion die to 480 ℃ and preserving heat, heating an aluminum bar to 490 ℃, sending the heated aluminum bar into a ingot containing barrel, extruding the aluminum bar from the extrusion die through an extrusion rod to obtain an aluminum profile, wherein the temperature of an extrusion opening is 520 ℃, and the extrusion speed is 3.8 mm/s;
air cooling the aluminum profile until the temperature is lower than 200 ℃, feeding the aluminum profile into a cooling bed, and straightening the aluminum profile when the temperature is lower than 55 ℃ after the aluminum profile is air cooled by the cooling bed;
and sawing the cooled aluminum profile, and putting the aluminum profile into a turnover vehicle to age the sawed aluminum profile, wherein the aging heat preservation temperature is 170 ℃, and the heat preservation time is 6 h.
S22: forming an aluminum profile: the aluminum profile is subjected to stretch bending forming in bending equipment, and the bending force value is 32000N;
s23: polishing: polishing the surface of the aluminum profile by a robot;
s24: anodic oxidation: degreasing in the anodic oxidation process at the temperature of 60 ℃ for 300 s; the electrochemical polishing is carried out under the condition that the voltage is 35V, and the processing time is 1500 s; performing alkali washing at 25 ℃ for 60 s; acid washing is carried out at the temperature of 25 ℃ for 360 s; the electrolytic oxidation is carried out under the condition that the voltage is 15V, and the treatment time is 1600 s; the oxide film hole generated after oxidation is processed by special sealing treatment.
EXAMPLE III
A method of manufacturing a roof rack comprising the steps of:
s1: casting: slagging off, component adjustment and refining are sequentially carried out on the aluminum liquid;
the refined aluminum liquid is sequentially subjected to deslagging through a first plate filter of 40 meshes and a second plate filter of 60 meshes;
adding 1.5 percent by weight of aluminum-titanium-boron alloy refiner into the molten aluminum after deslagging;
injecting the aluminum liquid added with the aluminum-titanium-boron alloy refiner into a standing furnace for standing;
introducing the aluminum liquid after standing into a casting furnace for casting to obtain an alloy ingot;
homogenizing the alloy cast ingot, namely heating the alloy cast ingot to 530 ℃, preserving the heat at 530 ℃ for 5 hours, and cooling by water mist after the heat preservation is finished to obtain an aluminum bar with the grain size of 70-100 mu m; removing the outer skin of the aluminum bar by sawing;
s2: obtaining a luggage rack according to an aluminum bar with the grain size of 70-100 mu m;
specifically, S2 further includes:
s21: heating an extrusion die to 480 ℃ and preserving heat, heating an aluminum bar to 490 ℃, sending the heated aluminum bar into a ingot containing barrel, extruding the aluminum bar from the extrusion die through an extrusion rod to obtain an aluminum profile, wherein the temperature of an extrusion opening is 520 ℃, and the extrusion speed is 3.8 mm/s;
air cooling the aluminum profile until the temperature is lower than 200 ℃, feeding the aluminum profile into a cooling bed, and straightening the aluminum profile when the temperature is lower than 55 ℃ after the aluminum profile is air cooled by the cooling bed;
and sawing the cooled aluminum profile, and putting the aluminum profile into a turnover vehicle to age the sawed aluminum profile, wherein the aging heat preservation temperature is 170 ℃, and the heat preservation time is 6 h.
S22: forming an aluminum profile: the aluminum profile is subjected to stretch bending forming in bending equipment, and the bending force value is 32000N;
s23: polishing: polishing the surface of the aluminum profile by a robot;
s24: anodic oxidation: degreasing in the anodic oxidation process at the temperature of 60 ℃ for 300 s; the electrochemical polishing is carried out under the condition that the voltage is 35V, and the processing time is 1500 s; performing alkali washing at 25 ℃ for 60 s; acid washing is carried out at the temperature of 25 ℃ for 360 s; the electrolytic oxidation is carried out under the condition that the voltage is 15V, and the treatment time is 1600 s; the oxide film hole generated after oxidation is processed by special sealing treatment.
In conclusion, according to the manufacturing method of the luggage rack provided by the invention, the two plate-type filters are arranged for deslagging, so that the pure precision of the filtered aluminum liquid is higher; the aluminum bar with the grain size of 70-100 mu m is subjected to extrusion forming within a specified condition range, so that the extruded aluminum profile tissue is refined, the aluminum profile obtained by refining the aluminum bar with the grain size of 70-100 mu m is improved in wrinkling phenomenon, and wrinkles on the surfaces of two ends after stretch bending can be eliminated quickly and thoroughly by robot polishing; and the anode oxidation can improve the brightness of the appearance of the aluminum profile by improving the alkali washing and acid washing time. The invention can thoroughly improve the surface wrinkling phenomenon of the aluminum profile after stretch bending, improve the appearance of the aluminum profile product, ensure that the manufactured aluminum profile meets the requirements of a luggage rack and improve the yield of the product; and because the wrinkling on the surface of the aluminum profile is obviously improved, the grinding time before the polishing of the aluminum profile is saved, the labor cost is reduced, and the production efficiency is improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (8)
1. A method of manufacturing a roof rack, comprising the steps of:
s1: casting: deslagging the refined aluminum liquid by sequentially passing through a first plate filter with filtering precision of 40-60 meshes and a second plate filter with filtering precision of 50-80 meshes;
adding 1.2 to 1.6 weight percent of aluminum-titanium-boron alloy refiner into the aluminum liquid after deslagging;
sequentially standing and casting the aluminum liquid added with the aluminum-titanium-boron alloy refiner to obtain an alloy ingot;
homogenizing the alloy cast ingot: heating the alloy cast ingot to 530-550 ℃, preserving heat for 4-9 h at 530-550 ℃, and cooling with water mist after heat preservation to obtain an aluminum bar with the grain size of 70-100 mu m;
s2: the luggage rack is obtained according to the aluminum bar with the grain size of 70-100 mu m.
2. The method of claim 1, wherein the S2 further comprises S21: extrusion molding: heating an extrusion die to 450-500 ℃ and preserving heat, heating an aluminum bar to 460-510 ℃, sending the heated aluminum bar into a ingot containing cylinder, extruding the aluminum bar from the extrusion die through an extrusion rod to obtain an aluminum profile, wherein the temperature of an extrusion opening is 500-550 ℃, and the extrusion speed is 3.0-4.2 mm/s;
air cooling the aluminum profile until the temperature is lower than 200 ℃, and air cooling, straightening, sawing and aging the aluminum profile.
3. The method for manufacturing a roof rack according to claim 2, wherein the step S21 comprises the following steps:
after the aluminum profile is air-cooled until the temperature is lower than 200 ℃, feeding the aluminum profile into a cooling bed, and after the aluminum profile is air-cooled by the cooling bed, straightening the aluminum profile at the temperature lower than 55 ℃;
and sawing the cooled aluminum profile, and putting the aluminum profile into a turnover vehicle to age the sawed aluminum profile, wherein the temperature of the aged aluminum profile is 100-200 ℃, and the time of the aged aluminum profile is 2-8 h.
4. The method of manufacturing a roof rack according to claim 1, further comprising S22: forming an aluminum profile: and (3) stretch bending and forming the aluminum profile in bending equipment, wherein the bending force value is 20000N-36000N.
5. The method of manufacturing a roof rack according to claim 1, further comprising S23: polishing: and polishing the surface of the aluminum profile by a robot.
6. The method of manufacturing a roof rack according to claim 1, further comprising S24: anodic oxidation: the alkali washing time in the anodic oxidation process is 50-120 s; the pickling time is 240-420 s.
7. The method for manufacturing a roof rack according to claim 6, wherein the step S24 includes:
degreasing, electrochemical polishing, alkali washing, acid washing and electrolytic oxidation.
8. The method for manufacturing a roof rack according to claim 7, wherein in S24, the degreasing is performed at a temperature of 40-70 ℃ for 180-480S; the electrochemical polishing is carried out under the condition that the voltage is 20V-40V, and the processing time is 600 s-2100 s; performing alkali washing at the temperature of 20-35 ℃ for 50-120 s; acid washing is carried out at the temperature of 20-35 ℃, and the treatment time is 60-360 s; the electrolytic oxidation is carried out under the condition that the voltage is 12V-18V, and the treatment time is 600 s-2100 s.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113122758A (en) * | 2021-03-16 | 2021-07-16 | 江阴沐祥节能装饰工程有限公司 | Off-road vehicle luggage rack aluminum profile and processing technology thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101921939A (en) * | 2010-09-09 | 2010-12-22 | 西南大学 | Method for preparing 5182 big flat ingot with high performance by short flow process |
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| CN101921939A (en) * | 2010-09-09 | 2010-12-22 | 西南大学 | Method for preparing 5182 big flat ingot with high performance by short flow process |
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| CN105838942A (en) * | 2016-05-20 | 2016-08-10 | 淮安和通汽车零部件有限公司 | 6042 aluminum alloy and preparation method thereof |
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| CN113122758A (en) * | 2021-03-16 | 2021-07-16 | 江阴沐祥节能装饰工程有限公司 | Off-road vehicle luggage rack aluminum profile and processing technology thereof |
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