CN116377263A - High-hardness high-surface-quality aluminum alloy section bar and processing method thereof - Google Patents
High-hardness high-surface-quality aluminum alloy section bar and processing method thereof Download PDFInfo
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 89
- 238000003672 processing method Methods 0.000 title claims abstract description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 33
- 238000001125 extrusion Methods 0.000 claims abstract description 22
- 230000032683 aging Effects 0.000 claims abstract description 15
- 238000010791 quenching Methods 0.000 claims abstract description 15
- 230000000171 quenching effect Effects 0.000 claims abstract description 14
- 230000003746 surface roughness Effects 0.000 claims abstract description 8
- 238000005266 casting Methods 0.000 claims abstract description 5
- 238000003723 Smelting Methods 0.000 claims abstract description 4
- 238000009432 framing Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 11
- 235000012438 extruded product Nutrition 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 21
- 230000000052 comparative effect Effects 0.000 description 18
- 229910045601 alloy Inorganic materials 0.000 description 13
- 239000000956 alloy Substances 0.000 description 13
- 239000000203 mixture Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
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- 238000007796 conventional method Methods 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
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- 239000006104 solid solution Substances 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
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- 238000011056 performance test Methods 0.000 description 1
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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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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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
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
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Abstract
The invention relates to a high-hardness high-surface-quality aluminum alloy section bar and a processing method thereof, comprising the following steps: smelting and casting; homogenizing to obtain aluminum bars; the aluminum bar is sent into a power frequency furnace to be heated to 520-540 ℃, and then is sent into a high temperature furnace to be heated and kept at 530-540 ℃; extrusion molding is carried out to obtain an extrusion product, wherein the temperature of an aluminum bar feeding machine is 520-530 ℃, the temperature of a die is 450-480 ℃, and the temperature of a profile outlet is 520-540 ℃; quenching on line; straightening, sawing, framing and artificially aging to obtain the aluminum alloy profile. According to the processing method, on the premise of not increasing the production risk of aluminum alloy ingots, aluminum alloy sections with the hardness of 105HBW and more and the surface roughness Rmax of 10 mu m and less can be obtained, the number of extruded aluminum bars on a traditional one-pair die is increased to more than 100 when the number of extruded aluminum bars is lower than 20, and the increase range of production efficiency is up to more than 400%.
Description
Technical Field
The invention relates to the field of aluminum alloy profile processing, in particular to a high-hardness high-surface-quality aluminum alloy profile and a processing method thereof.
Background
Along with the development of industrial automation, the high-precision valve body parts are increasingly widely applied, and aluminum alloy is a preferred material for the high-precision valve body parts such as electromagnetic valves, pneumatic valves and the like due to light weight, excellent corrosion resistance and attractive color after anodic oxidation.
The high-precision valve body parts of aluminum alloy are prepared by extruding to obtain aluminum alloy sections, such as solid aluminum alloy rod extruded sections, aluminum alloy extruded sections with processing holes and the like, aging to prepare blanks, and machining to prepare the high-precision valve body parts.
The aluminum alloy profile used for the high-precision valve body parts is expected to have a higher hardness level to facilitate machining and good surface quality (lower surface roughness) to meet the requirement of tightness.
In the long-term use practice process, 6082 aluminum alloy becomes a main stream alloy of high-precision valve body parts with higher hardness level and good extrudability, and also becomes an aluminum alloy brand definitely designated by customers.
The 6082 aluminum alloy belongs to aluminum alloy with high alloy element content, and can obtain higher hardness. However, the alloy element content of the 6082 aluminum alloy is high, so that the surface of the 6082 aluminum alloy is easy to be roughened during extrusion, and the production efficiency is affected.
Preparing 6082 aluminum alloy section by adopting a traditional processing method, wherein the hardness is about 90-102HBW; and the number of the extruded aluminum alloy round ingots is less than or equal to 20 under the requirement that Rmax is less than or equal to 20 mu m. In order to further increase the hardness, the conventional method is to increase the content of alloy elements, which in turn increases the surface roughness of the profile, resulting in a decrease in the surface quality of the profile and a decrease in the production efficiency.
Chinese patent CN110735073a discloses a high quality 6-series aluminum alloy extruded cast billet and a preparation method thereof, comprising the steps of sequentially performing preliminary cooling treatment, bath immersing treatment and subsequent cooling treatment on the 6-series aluminum alloy cast billet after homogenization heat treatment. Although the surface quality of the extruded product can be improved to some extent. However, in actual industrial production, most aluminum alloy foundries do not have the working conditions of dipping, and in addition, the dipping treatment of aluminum alloy cast ingots is increased, and meanwhile, the production risk is also greatly increased.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the processing method of the aluminum alloy section bar, which can obtain higher section bar hardness and excellent surface quality on the premise of not increasing the production risk of the aluminum alloy cast ingot, and the processing method is adopted to process the aluminum alloy section bar, so that the production efficiency is higher.
In order to achieve the purpose, the invention adopts the following technical scheme:
the processing method of the aluminum alloy section comprises the following steps:
(1) Smelting and casting an aluminum alloy raw material to obtain an aluminum alloy round ingot, wherein the aluminum alloy raw material comprises the following components in percentage by mass: 0.90-1.10%; fe: less than or equal to 0.15 percent; cu: less than or equal to 0.10 percent; mn:0.50-0.60%; mg:0.60-0.80%; cr: less than or equal to 0.20 percent; zn: less than or equal to 0.02 percent; ti: less than or equal to 0.03 percent; the balance of Al;
(2) Homogenizing the aluminum alloy round ingot, and then sawing to obtain an aluminum rod for extrusion;
(3) The aluminum bar is sent into a power frequency furnace to be heated to 520-540 ℃, and then is sent into a high temperature furnace to be heated and kept at 530-540 ℃;
(4) Extruding and molding the aluminum bar discharged from the high-temperature furnace to obtain an extruded product, wherein the temperature of the aluminum bar feeding machine is 520-530 ℃, the temperature of the die is 450-480 ℃, and the temperature of the profile outlet is 520-540 ℃;
(5) Quenching the extruded product on-line;
(6) Straightening, sawing, framing and artificially aging the quenched product to obtain the aluminum alloy profile.
In the invention, the extrusion product after extrusion molding is immediately subjected to on-line quenching, so that the outlet temperature of the profile is the quenching temperature.
In some embodiments, in step (4), the heating time in the power frequency furnace is equal to or less than 5min, and the heating and heat preserving time in the high temperature furnace is equal to or more than 15min.
In some embodiments, in the step (2), the homogenizing treatment process is to heat the round aluminum alloy ingot to 560-570 ℃ at a heating rate of more than or equal to 150 ℃/h for heat preservation for 8-16h, and then cool to less than or equal to 100 ℃ at a cooling rate of more than or equal to 150 ℃/h.
In some embodiments, in step (4), the extrusion speed is ≡2mm/s.
In some embodiments, the in-line quench employs through-water cooling.
In some specific embodiments, the technological parameters of the online quenching are controlled to be the quenching temperature of 520-540 ℃ and the cooling rate is more than or equal to 1000 ℃/min.
In some embodiments, the artificial aging is performed at an aging temperature of 170 to 190 ℃ for an artificial aging time of 6 to 10 hours.
In some embodiments, the aluminum alloy feedstock also includes unavoidable impurities, wherein the individual impurity content is 0.05% or less and the total amount of impurities is 0.15% or less.
Although the 6082 aluminum alloy section prepared by the traditional processing method can be widely applied to high-precision valve body parts, along with the continuous improvement of the production efficiency and the service performance of the high-precision valve body parts, higher requirements are provided, such as:
(1) In order to improve the subsequent machining efficiency, the hardness of the profile is expected to be further improved, and the required hardness is improved from more than or equal to 90HBW to more than or equal to 105HBW;
(2) In order to ensure the sealing property, the surface roughness needs to be further strictly controlled, and R is required max Reducing the particle size from less than or equal to 20 mu m to less than or equal to 10 mu m.
The hardness of the aluminum alloy section bar processed by the processing method is more than or equal to 105HBW and R max Less than or equal to 10 mu m. And at R max Under the requirement of less than or equal to 10 mu m, the number of extruded aluminum bars on one die is more than or equal to 100, and the high requirements of high-precision valve body parts on production efficiency and service performance can be well met.
In the present invention, the high surface quality mainly means low surface roughness.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
according to the processing method, on the premise of not increasing the production risk of aluminum alloy ingots, aluminum alloy sections with the hardness of 105HBW and more and the surface roughness Rmax of 10 mu m and less can be obtained, the hardness of the aluminum alloy sections is improved, meanwhile, the surface quality of the sections is improved, the production efficiency of the aluminum alloy sections is greatly improved, the number of extruded aluminum bars on a traditional pair of dies is increased to be more than 100 when being lower than 20, and the improvement range of the production efficiency is up to more than 400%.
Drawings
FIG. 1 is a graph of electrical conductivity and temperature during heating of a 6-series aluminum alloy ingot;
FIG. 2 is a surface view of an aluminum alloy profile of example 1;
FIG. 3 is a surface view of an aluminum alloy profile of comparative example 2;
fig. 4 is a surface view of the aluminum alloy profile of comparative example 6.
Detailed Description
As described in the background art, the conventional processing method is used for preparing 6082 aluminum alloy section with the hardness of about 90-102HBW, and in order to further improve the hardness, the conventional method is implemented by improving the content of alloy elements, which in turn increases the surface roughness of the section, resulting in the reduction of the surface quality of the section and the reduction of the production efficiency, and the conventional method for improving the surface quality of the section (such as CN110735073 a) has the problem of great production risk. On the premise of not increasing the production risk of aluminum alloy cast ingots, how to reconcile the contradiction between the hardness and the surface quality of the profile and how to improve the surface quality of the profile while providing the hardness of the profile becomes a key technical difficulty in the production of the profile. In the prior art, however, there is no good solution.
Aiming at 6082 aluminum alloy section, the inventor aims at solving the practical requirements of surface quality and hardness improvement on the premise of not increasing the production risk of aluminum alloy cast ingots, realizes the approximate maximized solid solution of Mg, si elements by combining the optimization of a preheating process in the extrusion process with the content of the low-level Mg, si and other strengthening elements, adopts a low-temperature-rise extrusion mode of similar aluminum alloy round cast ingot temperature and section quenching temperature and a section water-penetrating rapid cooling mode, so that the Mg, si elements in the section are maximally dissolved in a matrix to exert the high-level strengthening effect in artificial aging, and realizes high hardness.
The inventor of the application researches the situation that reinforcing elements such as Mg, si and the like are separated out or dissolved back from a matrix in the heating process of a 6-series aluminum alloy cast ingot, and adopts conductivity for characterization, wherein the increase of the conductivity indicates that the reinforcing elements such as Mg, si and the like are separated out from the matrix, which is not beneficial to improving the hardness; the conductivity reduction means that the strengthening elements such as Mg, si and the like are dissolved back into the matrix, which is beneficial to improving the hardness. As shown in FIG. 1, the solid solution level of the strengthening elements such as Mg, si and the like is higher at 520-540 ℃, which is favorable for obtaining higher hardness.
Further, the processing method of the aluminum alloy section comprises the following steps:
(1) Ingot casting preparation: smelting and casting an aluminum alloy raw material to obtain an aluminum alloy round ingot, wherein the aluminum alloy raw material comprises Si in percentage by mass: 0.90-1.10%; fe: less than or equal to 0.15 percent; cu: less than or equal to 0.10 percent; mn:0.50-0.60%; mg:0.60-0.80%; cr: less than or equal to 0.20 percent; zn: less than or equal to 0.02 percent; ti: less than or equal to 0.03 percent; the balance of Al;
(2) Homogenizing: heating the aluminum alloy round ingot to 560-570 ℃ at a heating rate of more than or equal to 150 ℃/h for heat preservation for 8-16h, then cooling to less than or equal to 100 ℃ at a cooling rate of more than or equal to 150 ℃/h, and then sawing to obtain an aluminum rod for extrusion;
(3) Preheating: the aluminum bar is sent into a power frequency furnace to be heated to 520-540 ℃ under the condition that the temperature is less than or equal to 5min, then is sent into a high temperature furnace to be heated and insulated, the heating and insulated temperature is 530-540 ℃, and the heating and insulated time is more than or equal to 15min;
(4) Extrusion molding: extruding and molding the aluminum bar discharged from the high-temperature furnace to obtain an extruded product, wherein the temperature of an upper machine of the aluminum bar is 520-530 ℃, the extrusion speed is more than or equal to 2mm/s, the temperature of a die is 450-480 ℃, and the temperature of a profile outlet is 520-540 ℃;
(5) Carrying out on-line quenching on the extruded product by passing through water and rapidly cooling;
(6) Straightening, sawing, framing and artificially aging the quenched product to obtain the aluminum alloy profile, wherein the artificially aging temperature is 170-190 ℃ and the heat preservation time is 6-10 h.
The following detailed description of the present invention is provided in connection with specific embodiments so that those skilled in the art may better understand and practice the present invention, but is not intended to limit the scope of the present invention.
The aluminum alloy raw material formulations referred to in examples and comparative examples are shown in table 1, and the processing parameters referred to are shown in table 2.
Table 1 raw material formulations of aluminum alloys related to examples and comparative examples
| Name of the name | Si | Fe | Cu | Mn | Mg | Cr | Ti | Al |
| Alloy 1 | 0.90 | 0.13 | 0.10 | 0.60 | 0.60 | 0.00 | 0.02 | Allowance of |
| Alloy 2 | 1.00 | 0.12 | 0.05 | 0.55 | 0.70 | 0.10 | 0.02 | Allowance of |
| Alloy 3 | 1.10 | 0.15 | 0.00 | 0.50 | 0.80 | 0.20 | 0.02 | Allowance of |
| Alloy 4 | 0.85 | 0.15 | 0.05 | 0.45 | 0.55 | 0.10 | 0.02 | Allowance of |
| Alloy 5 | 1.15 | 0.18 | 0.05 | 0.65 | 0.85 | 0.10 | 0.02 | Allowance of |
Table 2 processing parameters relating to examples and comparative examples
Wherein, the heating temperatures of the high-temperature furnaces in the processes 1 to 7 and the processes 10 to 12 are all the furnace gas temperatures; preheating in the process 9, preheating by a power frequency furnace is not adopted, but a high-temperature furnace is directly adopted to heat the aluminum rod, wherein the furnace gas temperature of the high-temperature furnace is 540 ℃, and the temperature of 510 ℃ is the temperature reached after the aluminum rod is heated in the high-temperature furnace for 60 min; the preheating of the process 12 is to heat the aluminum bar to 530 ℃ in 40min in a power frequency furnace in a slow heating mode.
The selection of aluminum alloy raw materials and technological parameters adopted in the processing method of the aluminum alloy sections provided by the embodiments 1-9 are shown in table 3, and performance detection is carried out on the aluminum alloy sections prepared by the embodiments 1-9, and the results are shown in table 3, wherein the homogenization heat preservation time in the processing method of the embodiments 1-8 is 10 hours, and the technological parameters of artificial aging are 175 ℃ multiplied by 8 hours; the homogenization heat-preservation time in the processing method of example 9 is 15 hours, and the process parameters of artificial aging are 190 ℃ x 6 hours.
The aluminum alloy raw materials and the process parameters adopted in the processing methods of the aluminum alloy sections provided in comparative examples 1 to 8 are selected in table 3, and the aluminum alloy sections prepared in examples 1 to 8 are subjected to performance detection, and the results are shown in table 3.
Table 3 alloy compositions, processing techniques and performance test results of aluminum alloy profiles of examples 1 to 8 and comparative examples 1 to 8
Note that: the test by adopting 3 aluminum bars in table 3 refers to a feasibility verification test of a technical scheme, wherein the 3 aluminum bars are extruded to collect corresponding test data, if all technical indexes are qualified, the batch verification test is further carried out, otherwise, the batch verification test is not further carried out. In contrast, comparative example 1 and comparative examples 3 to 8 were not subjected to further batch verification tests.
As can be seen from comparison of examples 1-3 and comparative examples 1-2, when the alloy composition of the aluminum alloy section bar of examples 1-3 is within the scope of the technical scheme of the patent, the hardness of the section bar is more than or equal to 105HBW, the number of extrusion bars of which the Rmax of a single die is less than or equal to 10 mu m is more than or equal to 100, and in addition, the surface quality of the section bar of example 1 is as shown in figure 2, the surface quality of the section bar is smoother, and the surface quality is good; when the alloy composition of the aluminum alloy section bars of comparative examples 1-2 is lower than the range of the technical scheme of the patent, the hardness of the section bar is 102HBW and is lower than
105HBW; when the alloy composition is higher than the range of the technical proposal, the number of extrusion bars with Rmax less than or equal to 10 mu m on a single die is only 20, thus greatly reducing the production efficiency. In addition, the surface quality of the profile of comparative example 2 is as shown in fig. 3, and the surface of the profile has remarkable and felt stripes, and the surface quality is poor.
According to the embodiment 4-8, when the extrusion process is in the technical scheme of the patent, the hardness of the profile is more than or equal to 105HBW, and the number of extrusion bars with the Rmax less than or equal to 10 mu m on a single die is more than or equal to 100.
According to comparative example 3, when the heating time in the high temperature furnace when the aluminum bar is preheated is lower than the range of the technical scheme of the patent, the hardness of the profile is 102HBW and lower than 105HBW.
According to comparative example 4, when the aluminum bar is heated to the temperature range of the aluminum bar required by the technical scheme of the patent only by adopting a power frequency furnace, and a high-temperature furnace heating and heat preservation measure is not adopted, the hardness of the profile is 98HBW, and is greatly lower than 105HBW.
According to comparative example 5, when the aluminum bar is heated only by a high-temperature furnace without using a power frequency furnace, the temperature of the aluminum bar is low, and even if the temperature of furnace gas is 540 ℃ and the heating time is greatly prolonged to 60min, the temperature of the aluminum bar only reaches 510 ℃, the aluminum bar cannot be heated to the temperature of the aluminum bar required by the technical scheme, and the hardness of the profile is 95HBW and is greatly lower than 105HBW; the mode also greatly reduces the production efficiency. The temperature of the aluminum bar is heated to 540 ℃, the heating time is far longer than 60 minutes, and the production efficiency is further reduced.
As is clear from comparative example 6, when the quenching temperature of the profile exceeds the upper limit required in the present patent application, the profile is cracked at the edge, and as shown in fig. 4, the profile has cracks at the edge.
According to comparative example 7, when the extrusion speed is lower than the lower limit required by the technical scheme of the patent, the quenching temperature of the profile is too low due to the fact that negative temperature rise occurs due to too low extrusion speed, so that the hardness of the profile is only 90HBW and is greatly lower than 105HBW.
As is clear from comparative example 8, when the heating time is too long with a slow heating rate of the commercial furnace, the hardness of the profile is 103HBW, which is slightly lower than 105HBW. In addition, the frequency of rod feeding of the industrial frequency furnace is lower than the extrusion frequency, so that the rod feeding of extrusion is insufficient, and mass smooth production is difficult.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
Claims (9)
1. The processing method of the aluminum alloy section bar is characterized by comprising the following steps of:
(1) Smelting and casting an aluminum alloy raw material to obtain an aluminum alloy round ingot, wherein the aluminum alloy raw material comprises the following components in percentage by mass: 0.90-1.10%; fe: less than or equal to 0.15 percent; cu: less than or equal to 0.10 percent; mn:0.50-0.60%; mg:0.60-0.80%; cr: less than or equal to 0.20 percent; zn: less than or equal to 0.02 percent; ti: less than or equal to 0.03 percent; the balance of Al;
(2) Homogenizing the aluminum alloy round ingot, and then sawing to obtain an aluminum rod for extrusion;
(3) The aluminum bar is sent into a power frequency furnace to be heated to 520-540 ℃, and then is sent into a high temperature furnace to be heated and kept at 530-540 ℃;
(4) Extruding and molding the aluminum bar discharged from the high-temperature furnace to obtain an extruded product, wherein the temperature of the aluminum bar feeding machine is 520-530 ℃, the temperature of the die is 450-480 ℃, and the temperature of the profile outlet is 520-540 ℃;
(5) Quenching the extruded product on-line;
(6) Straightening, sawing, framing and artificially aging the quenched product to obtain the aluminum alloy profile.
2. The method for processing an aluminum alloy profile according to claim 1, wherein: in the step (4), the heating time in the power frequency furnace is less than or equal to 5min, and the heating and heat preserving time in the high temperature furnace is more than or equal to 15min.
3. The method for processing an aluminum alloy profile according to claim 1, wherein: in the step (2), the homogenizing treatment process is to heat the round aluminum alloy ingot to 560-570 ℃ at a heating rate of more than or equal to 150 ℃/h for heat preservation for 8-16h, and then cool to less than or equal to 100 ℃ at a cooling rate of more than or equal to 150 ℃/h.
4. The method for processing an aluminum alloy profile according to claim 1, wherein: in the step (4), the extrusion speed is more than or equal to 2mm/s.
5. The method for processing an aluminum alloy profile according to claim 1, wherein: the online quenching adopts water cooling.
6. The method for processing an aluminum alloy profile according to claim 5, wherein: the technological parameters of the online quenching are controlled to be the quenching temperature of 520-540 ℃ and the cooling rate of more than or equal to 1000 ℃/min.
7. The method for processing an aluminum alloy profile according to claim 1, wherein: the ageing temperature of the artificial ageing is 170-190 ℃, and the artificial ageing time is 6-10 h.
8. The method for processing an aluminum alloy profile according to claim 1, wherein: the aluminum alloy raw material also comprises unavoidable impurities, wherein the content of single impurities is less than or equal to 0.05 percent, and the total content of impurities is less than or equal to 0.15 percent.
9. An aluminum alloy profile processed by the processing method of the aluminum alloy profile according to any one of claims 1 to 8, which is characterized in that: the hardness of the aluminum alloy section is more than or equal to 105HBW, and the surface roughness R max ≤10μm。
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| CN202310386251.7A CN116377263A (en) | 2023-04-12 | 2023-04-12 | High-hardness high-surface-quality aluminum alloy section bar and processing method thereof |
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| CN202310386251.7A CN116377263A (en) | 2023-04-12 | 2023-04-12 | High-hardness high-surface-quality aluminum alloy section bar and processing method thereof |
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2023
- 2023-04-12 CN CN202310386251.7A patent/CN116377263A/en active Pending
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