CN109500552B - Vehicle luggage rack section bar and preparation method thereof - Google Patents
Vehicle luggage rack section bar and preparation method thereof Download PDFInfo
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- CN109500552B CN109500552B CN201811572566.6A CN201811572566A CN109500552B CN 109500552 B CN109500552 B CN 109500552B CN 201811572566 A CN201811572566 A CN 201811572566A CN 109500552 B CN109500552 B CN 109500552B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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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
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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
- C22F1/002—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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- 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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- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
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Abstract
本发明涉及一种车用行李架型材及其制备方法，型材的制备步骤如下：选择含硅、镁、铜、锰、铬、钼、镍、钨、钴的铝合金铸棒，将所述铝合金铸棒加热、保温，然后将加热的铝合金铸棒冷却后进行淬火，再将淬火后的铝合金铸棒进行回火处理；将挤压模具加热、保温，并将挤出料筒加热，然后将铝合金铸棒放入挤压筒，推动挤压筒内的铝合金铸棒从挤压模具的模口处挤出，形成挤压型材；对挤压模具模口处的挤压型材进行风冷冷却，使得模口处挤压型材的温度低于530℃；待型材冷却至50℃以下时进行矫直、锯切、时效，得车用行李架型材。本发明制备得到的车用行李架型材在抗拉强度、规定非比例延伸强度、延伸率、弯曲度等方面的性能优良。The invention relates to a vehicle luggage rack profile and a preparation method thereof. The preparation steps of the profile are as follows: selecting an aluminum alloy cast bar containing silicon, magnesium, copper, manganese, chromium, molybdenum, nickel, tungsten and cobalt, The alloy cast rod is heated and kept warm, then the heated aluminum alloy cast rod is cooled and then quenched, and then the quenched aluminum alloy cast rod is tempered; the extrusion die is heated and kept warm, and the extrusion barrel is heated, Then put the aluminum alloy cast rod into the extrusion cylinder, and push the aluminum alloy cast rod in the extrusion cylinder to extrude from the die opening of the extrusion die to form an extruded profile; Air-cooled and cooled, so that the temperature of the extruded profile at the die mouth is lower than 530°C; when the profile is cooled to below 50°C, straightening, sawing, and aging are performed to obtain vehicle luggage rack profiles. The vehicle luggage rack profile prepared by the invention has excellent performance in tensile strength, prescribed non-proportional elongation strength, elongation, bending degree and the like.
Description
Technical Field
The invention relates to a vehicle luggage rack section bar and a preparation method thereof, belonging to the technical field of manufacturing of vehicle accessories.
Background
The vehicle luggage rack refers to a support which is arranged on the roof or inside a vehicle body and is convenient for carrying luggage. At present, most of luggage racks are made of stainless steel materials, and although the luggage racks made of the stainless steel materials are not easy to rust, the luggage racks are expensive and have large mass, so that the development direction of vehicle light weight is not facilitated.
The aluminum alloy luggage rack has the advantage of light weight, so that the body of a truck, a passenger car and a rail vehicle achieves the effect of light weight, according to the report of the American aluminum society, the weight of the automobile can be reduced by 1kg when 0.45kg of aluminum is used on the automobile, and theoretically, the weight of the aluminum-made automobile can be reduced by about 40% compared with that of a steel automobile. However, as a hotspot of current automobile material research, aluminum alloy materials have poor mechanical properties, low tensile strength, small elongation, too large bending and other problems, so that the current aluminum alloys are rarely used as automobile luggage racks.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to solve the technical problems of low tensile strength, small elongation and overlarge bending degree of the conventional aluminum alloy automobile luggage rack, a vehicle luggage rack section and a preparation method thereof are provided.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a preparation method of a vehicle luggage rack section comprises the following steps:
preparing a casting rod: selecting an aluminum alloy cast rod, wherein the aluminum alloy cast rod comprises the following components in parts by weight: 0.15-0.35 wt% of silicon, 0.45-0.65 wt% of magnesium, 0.55-0.80 wt% of copper, 0.50-0.80 wt% of manganese, 0.90-1.20 wt% of chromium, 0.15-0.30 wt% of molybdenum, 0.85-1.30 wt% of nickel, 1.50-2.30 wt% of tungsten, 0.70-1.30 wt% of cobalt, and the balance of aluminum;
heat treatment of the cast rod: heating the aluminum alloy cast rod to 510-540 ℃, and preserving heat for 5-7 h; then cooling the heated aluminum alloy cast rod to below 50 ℃, and quenching under the conditions that the temperature is 550-600 ℃, the heat preservation time is 2-5 h, the transfer time is less than 30s, and the temperature of cooling liquid is less than 35 ℃; then tempering the quenched aluminum alloy cast rod at the temperature of 360-420 ℃ for 2-5 h; this operation enables to obtain a compact structure and good mechanical properties;
extruding: heating an extrusion die to 450-530 ℃, preserving heat for 1-3 hours, heating an extrusion charging barrel to 390-450 ℃, then putting an aluminum alloy cast rod into the extrusion barrel, and pushing the aluminum alloy cast rod in the extrusion barrel to extrude from a die orifice of the extrusion die to form an extruded section;
air cooling: cooling the extruded section at the die orifice of the extrusion die by air cooling so that the temperature of the extruded section at the die orifice is lower than 530 ℃;
straightening: straightening when the section bar is cooled to below 50 ℃;
sawing: sawing the straightened section;
aging: and (3) aging the sawed section at the temperature of 160-190 ℃ for 6-10 h to obtain the automotive luggage rack section.
Preferably, the aluminum alloy cast rod comprises the following components in parts by weight: 0.20 to 0.30 wt% of silicon, 0.50 to 0.60 wt% of magnesium, 0.60 to 0.80 wt% of copper, 0.60 to 0.80 wt% of manganese, 0.90 to 1.00 wt% of chromium, 0.20 to 0.30 wt% of molybdenum, 0.90 to 1.10 wt% of nickel, 1.80 to 2.00 wt% of tungsten, 0.80 to 1.00 wt% of cobalt, and the balance of aluminum.
Preferably, the preparation method of the aluminum alloy cast rod comprises the following steps: putting all components except aluminum in the components of the aluminum alloy cast rod into a smelting furnace, heating to 760-780 ℃ for complete melting, stirring the molten components, then adding an aluminum ingot, smelting at the temperature of 760-780 ℃ for 20-40 minutes, adding a covering agent according to 0.2-0.4 wt% of the metal mass in the smelting furnace, continuing smelting at the temperature of 760-780 ℃ for complete melting of the materials in the smelting furnace, and obtaining a molten liquid; wherein the covering agent is Na3AlF6、Na2CO3A mixture with NaCl;
stirring the molten liquid, and adding ZnCl accounting for 0.2-0.4 wt% of the molten liquid2Refining at the temperature of 760-780 ℃ for 1-2h to obtain an aluminum alloy melt;
casting the obtained molten aluminum alloy into an aluminum alloy cast rod under the conditions that the temperature is 700-730 ℃, the water pressure is 0.05-0.1 MPa, and the speed is 160-200 mm/min.
Preferably, the covering agent consists of Na with the mass ratio of 30-40:30-40:20-303AlF6、NaCO3Mixing with NaCl.
Preferably, the process parameters of the extrusion step are controlled as follows: the extrusion temperature is 440-510 ℃, the extrusion coefficient lambda is 15-30, and the extrusion speed is 5-8/m.min-1。
Preferably, the heating rate of the aluminum alloy cast rod heated to 510-540 ℃ is 10-20 ℃/min.
Preferably, the air cooling air volume is 80-100 m3/min。
Preferably, the step of preparing the cast rod further comprises the step of turning the cast rod.
The invention also provides the vehicle luggage rack section prepared by the process.
The invention also provides a vehicle luggage rack prepared by adopting the vehicle luggage rack section bar.
The invention has the beneficial effects that:
the method selects the aluminum alloy with specific composition, processes of heat treatment, extrusion, air cooling, straightening, saw cutting, aging and the like are sequentially carried out on the aluminum alloy cast rod, a proper temperature is selected for each process, particularly, the heat treatment process is sequentially subjected to heating, cooling, quenching and tempering, the alloy structure is adjusted, and the prepared automobile luggage rack section bar has excellent comprehensive performance, the tensile strength is more than or equal to 260MPa, and the specified non-proportional elongation strength is more than or equal to 120N/m2Elongation greater than or equal to 30% and degree of curvature<1mm, the luggage rack prepared by the sectional material has higher stability and is not easy to deform after long-term use.
Detailed Description
The present invention will now be described in further detail.
Example 1
The embodiment provides a preparation method of a vehicle luggage rack section, which comprises the following steps:
preparing a casting rod: selecting an aluminum alloy cast rod, and carrying out leather processing on the cast rod;
the aluminum alloy cast rod comprises the following components in parts by weight: 0.2 wt% silicon, 0.6 wt% magnesium, 0.6 wt% copper, 0.8 wt% manganese, 0.9 wt% chromium, 0.30 wt% molybdenum, 0.90 wt% nickel, 2.00 wt% tungsten, 0.8 wt% cobalt, the balance aluminum;
the preparation method of the aluminum alloy cast rod comprises the following steps: putting all the components except aluminum into a smelting furnace, heating to 770 ℃, completely melting the components, stirring the melted components, then adding an aluminum ingot, smelting at 770 ℃ for 30 minutes, adding a covering agent according to 0.3 wt% of the metal in the smelting furnace, continuously smelting at 770 ℃, and completely melting the materials in the smelting furnace to obtain a molten liquid; wherein the covering agent is Na with the mass ratio of 35:35:303AlF6、NaCO3A mixture with NaCl; stirring the molten liquid, adding ZnCl in an amount of 0.3 wt% based on the mass of the molten liquid2Refining at 770 ℃ for 1.5h to obtain molten aluminum alloy; at a temperature of 720 ℃ under water pressureCasting the obtained molten aluminum alloy into an aluminum alloy cast rod under the conditions of 0.07MPa and the speed of 170 mm/min.
Heat treatment of the cast rod: heating the aluminum alloy cast rod to 530 ℃ at a heating rate of 15 ℃/min, and preserving heat for 6 hours; then cooling the heated aluminum alloy cast rod to below 50 ℃, and quenching under the conditions that the temperature is 580 ℃, the heat preservation time is 3 hours, the transfer time is less than 30s, and the temperature of cooling liquid is less than 35 ℃; then tempering the quenched aluminum alloy cast rod at the temperature of 400 ℃ for 3 h;
extruding: heating an extrusion die to 500 ℃, preserving heat for 2 hours, heating an extrusion charging barrel to 400 ℃, then putting an aluminum alloy cast rod into the extrusion barrel, pushing the aluminum alloy cast rod in the extrusion barrel to extrude from a die orifice of the extrusion die, wherein the extrusion temperature is 480 ℃, the extrusion coefficient lambda is 20, and the extrusion speed is 6/m.min-1Forming an extruded profile;
air cooling: cooling the extruded section at the die orifice of the extrusion die by air cooling with the air volume of 90m3Min, enabling the temperature of the extruded section at the die orifice to be lower than 530 ℃;
straightening: straightening when the section bar is cooled to below 50 ℃;
sawing: sawing the straightened section;
aging: and (3) aging the sawed section at the temperature of 180 ℃ for 8h to obtain the automotive luggage rack section.
The vehicle luggage rack section bar prepared in the embodiment is subjected to performance test, and the results are as follows: a tensile strength of 275MPa and a non-proportional elongation of 140N/m2Elongation of 37% and degree of bending<1mm。
Example 2
The embodiment provides a preparation method of a vehicle luggage rack section, which comprises the following steps:
preparing a casting rod: selecting an aluminum alloy cast rod, and carrying out leather processing on the cast rod;
the aluminum alloy cast rod comprises the following components in parts by weight: 0.15 wt% silicon, 0.65 wt% magnesium, 0.55 wt% copper, 0.80 wt% manganese, 0.90 wt% chromium, 0.30 wt% molybdenum, 0.85 wt% nickel, 2.30 wt% tungsten, 0.70 wt% cobalt, the balance aluminum;
the preparation method of the aluminum alloy cast rod comprises the following steps: putting all the components except aluminum into a smelting furnace, heating to 760 ℃ to completely melt the components, stirring the melted components, then adding an aluminum ingot, smelting at the temperature of 760 ℃ for 40 minutes, adding a covering agent according to 0.2 wt% of the metal mass in the smelting furnace, continuing smelting at the temperature of 760 ℃, and completely melting the materials in the smelting furnace to obtain a molten liquid; wherein the covering agent is Na with the mass ratio of 30:40:303AlF6、NaCO3A mixture with NaCl; stirring the molten liquid, adding ZnCl in an amount of 0.4 wt% based on the mass of the molten liquid2Refining at 760 ℃ for 2h to obtain molten aluminum alloy; casting the obtained molten aluminum alloy into an aluminum alloy cast rod under the conditions that the temperature is 700 ℃, the water pressure is 0.05MPa and the speed is 160 mm/min.
Heat treatment of the cast rod: heating the aluminum alloy cast rod to 510 ℃ at a heating rate of 10 ℃/min, and preserving heat for 7 hours; then cooling the heated aluminum alloy cast rod to below 50 ℃, and quenching under the conditions that the temperature is 550 ℃, the heat preservation time is 5 hours, the transfer time is less than 30s, and the temperature of cooling liquid is less than 35 ℃; then tempering the quenched aluminum alloy cast rod at the temperature of 360 ℃ for 5 hours; this operation enables to obtain a compact structure and good mechanical properties;
extruding: heating an extrusion die to 450 ℃, preserving heat for 3 hours, heating an extrusion charging barrel to 390 ℃, then putting an aluminum alloy cast rod into the extrusion barrel, pushing the aluminum alloy cast rod in the extrusion barrel to extrude from a die orifice of the extrusion die, wherein the extrusion temperature is 440 ℃, the extrusion coefficient lambda is 30, and the extrusion speed is 5/m.min-1Forming an extruded profile;
air cooling: cooling the extruded section at the die orifice of the extrusion die by air cooling with air quantity of 80m3Min, enabling the temperature of the extruded section at the die orifice to be lower than 530 ℃;
straightening: straightening when the section bar is cooled to below 50 ℃;
sawing: sawing the straightened section;
aging: and (3) aging the sawed section at the temperature of 160 ℃ for 10h to obtain the automotive luggage rack section.
The vehicle luggage rack section bar prepared in the embodiment is subjected to performance test, and the results are as follows: the tensile strength is 260MPa, and the non-proportional elongation strength is 120N/m2Elongation of 30% and bending<1mm。
Example 3
The embodiment provides a preparation method of a vehicle luggage rack section, which comprises the following steps:
preparing a casting rod: selecting an aluminum alloy cast rod, and carrying out leather processing on the cast rod;
the aluminum alloy cast rod comprises the following components in parts by weight: 0.35 wt% silicon, 0.45 wt% magnesium, 0.80 wt% copper, 0.50 wt% manganese, 1.20 wt% chromium, 0.15 wt% molybdenum, 1.30 wt% nickel, 1.50 wt% tungsten, 1.30 wt% cobalt, the balance aluminum;
the preparation method of the aluminum alloy cast rod comprises the following steps: putting all the components except aluminum into a smelting furnace, heating to 780 ℃ to completely melt the components, stirring the melted components, then adding an aluminum ingot, smelting at the temperature of 780 ℃ for 20 minutes, adding a covering agent according to 0.4 wt% of the metal mass in the smelting furnace, continuing smelting at the temperature of 780 ℃ to completely melt the materials in the smelting furnace to obtain a molten liquid; wherein the covering agent is Na with the mass ratio of 40:40:203AlF6、NaCO3A mixture with NaCl; stirring the molten liquid, adding ZnCl in an amount of 0.2 wt% based on the mass of the molten liquid2Refining at 780 ℃ for 1h to obtain molten aluminum alloy; casting the obtained molten aluminum alloy into an aluminum alloy cast rod under the conditions that the temperature is 730 ℃, the water pressure is 0.1MPa and the speed is 200 mm/min.
Heat treatment of the cast rod: heating the aluminum alloy cast rod to 540 ℃ at a heating rate of 20 ℃/min, and preserving heat for 5 hours; then cooling the heated aluminum alloy cast rod to below 50 ℃, and quenching under the conditions that the temperature is 600 ℃, the heat preservation time is 2 hours, the transfer time is less than 30s, and the temperature of cooling liquid is less than 35 ℃; then tempering the quenched aluminum alloy cast rod at the temperature of 420 ℃ for 2 hours; this operation enables to obtain a compact structure and good mechanical properties;
extruding: heating an extrusion die to 530 ℃, preserving heat for 1h, heating an extrusion charging barrel to 450 ℃, then putting an aluminum alloy cast rod into the extrusion barrel, pushing the aluminum alloy cast rod in the extrusion barrel to extrude from a die orifice of the extrusion die, wherein the extrusion temperature is 510 ℃, the extrusion coefficient lambda is 15, and the extrusion speed is 8/m.min-1Forming an extruded profile;
air cooling: cooling the extruded section at the die orifice of the extrusion die by air cooling with the air volume of 100m3Min, enabling the temperature of the extruded section at the die orifice to be lower than 530 ℃;
straightening: straightening when the section bar is cooled to below 50 ℃;
sawing: sawing the straightened section;
aging: and (3) aging the sawed section at the temperature of 190 ℃ for 6h to obtain the automotive luggage rack section.
The vehicle luggage rack section bar prepared in the embodiment is subjected to performance test, and the results are as follows: the tensile strength was 282MPa, and the non-proportional elongation was 151N/m2Elongation of 45% and bending<1mm。
Example 4
The embodiment provides a preparation method of a vehicle luggage rack section, which comprises the following steps:
preparing a casting rod: selecting an aluminum alloy cast rod, and carrying out leather processing on the cast rod;
the aluminum alloy cast rod comprises the following components in parts by weight: 0.30 wt% silicon, 0.50 wt% magnesium, 0.80 wt% copper, 0.60 wt% manganese, 1.00 wt% chromium, 0.20 wt% molybdenum, 1.10 wt% nickel, 1.80 wt% tungsten, 1.00 wt% cobalt, the balance aluminum;
the preparation method of the aluminum alloy cast rod comprises the following steps: adding all the components except aluminum into a smelting furnace, heating to 760 ℃, completely melting, stirring the molten components, adding aluminum ingots, smelting at 760 ℃ for 30 minutes, and smelting according to the metal in the smelting furnaceAdding covering agent with the mass of 0.3 wt%, continuously smelting at the temperature of 760 ℃, and completely melting the materials in the smelting furnace to obtain molten liquid; wherein the covering agent is Na with the mass ratio of 40:30:303AlF6、NaCO3A mixture with NaCl; stirring the molten liquid, adding ZnCl in an amount of 0.3 wt% based on the mass of the molten liquid2Refining at 760 ℃ for 1.5h to obtain molten aluminum alloy; casting the obtained molten aluminum alloy into an aluminum alloy cast rod under the conditions that the temperature is 710 ℃, the water pressure is 0.08MPa and the speed is 180 mm/min.
Heat treatment of the cast rod: heating the aluminum alloy cast rod to 530 ℃ at a heating rate of 15 ℃/min, and preserving heat for 6 hours; then cooling the heated aluminum alloy cast rod to below 50 ℃, and quenching under the conditions that the temperature is 570 ℃, the heat preservation time is 3 hours, the transfer time is less than 30s, and the temperature of cooling liquid is less than 35 ℃; then tempering the quenched aluminum alloy cast rod at the temperature of 380 ℃ for 3 hours;
extruding: heating an extrusion die to 480 ℃, preserving heat for 2 hours, heating an extrusion charging barrel to 420 ℃, then putting an aluminum alloy cast rod into the extrusion barrel, pushing the aluminum alloy cast rod in the extrusion barrel to extrude from a die orifice of the extrusion die, wherein the extrusion temperature is 480 ℃, the extrusion coefficient lambda is 20, and the extrusion speed is 7/m.min-1Forming an extruded profile;
air cooling: cooling the extruded section at the die orifice of the extrusion die by air cooling with the air volume of 90m3Min, enabling the temperature of the extruded section at the die orifice to be lower than 530 ℃;
straightening: straightening when the section bar is cooled to below 50 ℃;
sawing: sawing the straightened section;
aging: and (3) aging the sawed section at the temperature of 170 ℃ for 7h to obtain the automotive luggage rack section.
The vehicle luggage rack section bar prepared in the embodiment is subjected to performance test, and the results are as follows: a tensile strength of 275MPa and a non-proportional elongation of 138N/m2Elongation of 39% and bending<1mm。
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (9)
1. The preparation method of the automotive luggage rack section bar is characterized by comprising the following steps:
preparing a casting rod: selecting an aluminum alloy cast rod, wherein the aluminum alloy cast rod comprises the following components in parts by weight: 0.15-0.35 wt% of silicon, 0.45-0.65 wt% of magnesium, 0.55-0.80 wt% of copper, 0.50-0.80 wt% of manganese, 0.90-1.20 wt% of chromium, 0.15-0.30 wt% of molybdenum, 0.85-1.30 wt% of nickel, 1.50-2.30 wt% of tungsten, 0.70-1.30 wt% of cobalt, and the balance of aluminum; the preparation method of the aluminum alloy cast rod comprises the following steps: putting all components except aluminum in the components of the aluminum alloy cast rod into a smelting furnace, heating to 760-780 ℃ for complete melting, stirring the molten components, then adding an aluminum ingot, smelting at the temperature of 760-780 ℃ for 20-40 minutes, adding a covering agent according to 0.2-0.4 wt% of the metal mass in the smelting furnace, continuing smelting at the temperature of 760-780 ℃ for complete melting of the materials in the smelting furnace, and obtaining a molten liquid; wherein the covering agent is Na3AlF6、Na2CO3A mixture with NaCl; stirring the molten liquid, and adding ZnCl accounting for 0.2-0.4 wt% of the molten liquid2Refining at the temperature of 760-780 ℃ for 1-2h to obtain an aluminum alloy melt; casting the obtained aluminum alloy melt into an aluminum alloy cast rod under the conditions that the temperature is 700-730 ℃, the water pressure is 0.05-0.1 MPa and the speed is 160-200 mm/min;
heat treatment of the cast rod: heating the aluminum alloy cast rod to 510-540 ℃, and preserving heat for 5-7 h; then cooling the heated aluminum alloy cast rod to below 50 ℃, and quenching under the conditions that the temperature is 550-600 ℃, the heat preservation time is 2-5 h, the transfer time is less than 30s, and the temperature of cooling liquid is less than 35 ℃; then tempering the quenched aluminum alloy cast rod at the temperature of 360-420 ℃ for 2-5 h;
extruding: heating an extrusion die to 450-530 ℃, preserving heat for 1-3 hours, heating an extrusion cylinder to 390-450 ℃, then putting an aluminum alloy cast rod into the extrusion cylinder, and pushing the aluminum alloy cast rod in the extrusion cylinder to extrude from a die orifice of the extrusion die to form an extruded section;
air cooling: cooling the extruded section at the die orifice of the extrusion die by air cooling so that the temperature of the extruded section at the die orifice is lower than 530 ℃;
straightening: straightening when the section bar is cooled to below 50 ℃;
sawing: sawing the straightened section;
aging: and (3) aging the sawed section at the temperature of 160-190 ℃ for 6-10 h to obtain the automotive luggage rack section.
2. The preparation method of the vehicle luggage rack section bar according to claim 1, wherein the aluminum alloy cast rod comprises the following components in parts by weight: 0.20 to 0.30 wt% of silicon, 0.50 to 0.60 wt% of magnesium, 0.60 to 0.80 wt% of copper, 0.60 to 0.80 wt% of manganese, 0.90 to 1.00 wt% of chromium, 0.20 to 0.30 wt% of molybdenum, 0.90 to 1.10 wt% of nickel, 1.80 to 2.00 wt% of tungsten, 0.80 to 1.00 wt% of cobalt, and the balance of aluminum.
3. The method for preparing the vehicle roof rack section bar according to claim 1 or 2, wherein the covering agent is composed of Na in a mass ratio of 30-40:30-40:20-303AlF6、NaCO3Mixing with NaCl.
4. The method for preparing the vehicle roof rack section bar according to claim 1 or 2, wherein the process parameters of the extrusion step are controlled as follows: the extrusion temperature is 440-510 ℃, the extrusion coefficient lambda is 15-30, and the extrusion speed is 5-8 m.min-1。
5. The method for preparing the vehicle roof rack section bar according to claim 1 or 2, wherein the heating rate of the aluminum alloy cast rod to 510-540 ℃ is 10-20 ℃/min.
6. The method for preparing the vehicle roof rack section bar according to claim 1 or 2, wherein the air cooling air volume is 80-100 m3/min。
7. The method for preparing a roof rack section bar for a vehicle according to claim 1 or 2, wherein the step of preparing a cast rod further comprises a step of subjecting the cast rod to a railroad car treatment.
8. A roof rack section for a vehicle prepared by the method of any one of claims 1 to 7.
9. A vehicle roof rack manufactured using the vehicle roof rack section bar of claim 8.
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| JP2848368B2 (en) * | 1996-12-20 | 1999-01-20 | 日本軽金属株式会社 | Manufacturing method of aluminum alloy for compressor parts with excellent wear resistance and toughness |
| CN101558177A (en) * | 2006-12-13 | 2009-10-14 | 住友轻金属工业株式会社 | High-strength aluminum-base alloy products and process for production thereof |
| CN103103415A (en) * | 2012-12-11 | 2013-05-15 | 芜湖恒坤汽车部件有限公司 | Smelting and preparation method of aluminum alloy profile |
| CN104651685A (en) * | 2015-03-09 | 2015-05-27 | 苏州圣谱拉新材料科技有限公司 | Aluminum magnesium alloy material and preparation method thereof |
| CN106834986A (en) * | 2017-03-07 | 2017-06-13 | 烟台南山学院 | A kind of aviation alloyed aluminium homogenizing heat treatment |
| CN108441711A (en) * | 2018-03-06 | 2018-08-24 | 淮北富士特铝业有限公司 | A kind of anticorrosion aluminium ally section and its production technology |
-
2018
- 2018-12-21 CN CN201811572566.6A patent/CN109500552B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2848368B2 (en) * | 1996-12-20 | 1999-01-20 | 日本軽金属株式会社 | Manufacturing method of aluminum alloy for compressor parts with excellent wear resistance and toughness |
| CN101558177A (en) * | 2006-12-13 | 2009-10-14 | 住友轻金属工业株式会社 | High-strength aluminum-base alloy products and process for production thereof |
| CN103103415A (en) * | 2012-12-11 | 2013-05-15 | 芜湖恒坤汽车部件有限公司 | Smelting and preparation method of aluminum alloy profile |
| CN104651685A (en) * | 2015-03-09 | 2015-05-27 | 苏州圣谱拉新材料科技有限公司 | Aluminum magnesium alloy material and preparation method thereof |
| CN106834986A (en) * | 2017-03-07 | 2017-06-13 | 烟台南山学院 | A kind of aviation alloyed aluminium homogenizing heat treatment |
| CN108441711A (en) * | 2018-03-06 | 2018-08-24 | 淮北富士特铝业有限公司 | A kind of anticorrosion aluminium ally section and its production technology |
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