CN111906508B - Relieving heat radiator and preparation method thereof - Google Patents
Relieving heat radiator and preparation method thereof Download PDFInfo
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- CN111906508B CN111906508B CN202010735317.5A CN202010735317A CN111906508B CN 111906508 B CN111906508 B CN 111906508B CN 202010735317 A CN202010735317 A CN 202010735317A CN 111906508 B CN111906508 B CN 111906508B
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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
- B23P15/26—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass heat exchangers or the like
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- 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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
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Abstract
The invention discloses a relieving heat radiator and a preparation method thereof, wherein the preparation method comprises the following steps: s1: preparing a 6 series aluminum alloy plate with the hardness of 32HB-39 HB; s2: performing relieving processing on the 6-series aluminum alloy plate obtained in the step S1 to form a relieving radiator semi-finished product with a bottom plate and radiating fins; s3: performing aging heat treatment on the relieving heat radiator semi-finished product obtained in the step S2 until the hardness of the relieving heat radiator semi-finished product is raised to 55-64 HB; s4: and (4) machining the relieved tooth radiator semi-finished product processed in the step (S3) to obtain a relieved tooth radiator finished product. According to the invention, the hardness of the aluminum plate before the forming relieved tooth is reduced to improve the difficulty and the height of the forming relieved tooth, and then the hardness of the aluminum plate after the forming relieved tooth is improved through aging, so that the machinability of the aluminum alloy base plate is improved.
Description
Technical Field
The invention relates to the technical field of radiator preparation, in particular to a relieving radiator and a preparation method thereof.
Background
The shovel-tooth radiator breaks through the limitation of the thickness-length ratio of the conventional radiator, and the radiator with high density can be manufactured. The tooth piece and the base are integrated, the problem of any interface impedance is avoided, the heat dissipation effect is good, the heat dissipation effect is close to that of an aluminum extruded radiator, and the heat dissipation device is widely applied to photovoltaic industry, electric automobiles, inverters and communication products. The machining process of the relieving heat radiator comprises the step of utilizing a special cutter (relieving knife) to relieve and erect the tooth sheets on the aluminum alloy aluminum plate one by one.
The 1060 aluminum alloy hot rolled plate is mostly adopted as the aluminum alloy aluminum plate, the hardness is 24-38HB, the plate width is 50-500mm, the highest relieving height is 100mm, and the thickness of the tooth sheet is about 1 mm. A6063 aluminum alloy extrusion plate is also adopted, the hardness is about 34-42HB, the height of the highest relieving is 50mm, and the thickness of the tooth piece is about 1 mm.
Both of the above alloys have certain problems. The 1060 aluminum alloy hot rolled plate is alloy which can not be strengthened by heat treatment, the hardness of the material is lower, and although the difficulty of forming the teeth is lower, the subsequent processing cost is higher. If the problem of cutter sticking and cutter breaking easily occurs when the bottom plate is milled, after drilling and tapping, a tooth hole is easy to slip and break a screw tap, so that a workpiece is scrapped, in order to improve the problem, the machining speed of the workpiece needs to be reduced, a large number of reducing nuts of the threaded holes need to be added for improvement, and the machining cost is high. The 6063 aluminum alloy extruded plate has high hardness, the highest tooth forming height is far lower than that of a 1060 hot rolled plate, a natural age hardening phenomenon exists, and once a blank is not used for a long time, the quality of the tooth forming process is possibly abnormal after the hardness is naturally increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a relieved tooth radiator easy to process and a preparation method thereof.
In order to solve the technical problem, the invention adopts the following technical scheme:
a preparation method of a relieving heat radiator comprises the following steps:
s1: preparing a 6 series aluminum alloy plate with the hardness of 32HB-39 HB;
s2: performing relieving processing on the 6-series aluminum alloy plate obtained in the step S1 to form a relieving radiator semi-finished product with a bottom plate and radiating fins;
s3: carrying out aging heat treatment on the relieving heat radiator semi-finished product obtained in the step S2 until the hardness of the relieving heat radiator semi-finished product is raised to 55-64 HB;
s4: and machining the relieving radiator semi-finished product processed in the step S3 to obtain a relieving radiator finished product.
According to the invention, the hardness of the aluminum plate before the relieving is reduced to improve the relieving difficulty and height, and the hardness of the aluminum plate after the relieving is improved through aging, so that the machinability of the aluminum alloy base plate is improved.
In the above method for manufacturing a relieved tooth heat sink, in step S1, the manufacturing process of the 6-series aluminum alloy plate is preferably as follows:
s1.1: homogenizing the 6-series aluminum alloy ingot obtained by smelting, and cooling in sections;
s1.2: and (3) carrying out extrusion forming on the 6-series aluminum alloy cast ingot treated in the step (S1.1), and carrying out solution heat treatment on the extruded and formed plate to obtain the 6-series aluminum alloy plate.
In the above method for manufacturing a relieved tooth radiator, preferably, the aluminum alloy ingot comprises the following components: si: 0.25-0.35%, Fe: less than or equal to 0.20 percent, Cu: less than or equal to 0.05 percent, Mn: less than or equal to 0.07%, Mg: 0.35-0.45%, Ti: less than or equal to 0.025 percent; the balance of Al and inevitable impurities; wherein the weight percentage of each impurity is up to 0.05%, and the total amount is up to 0.15%.
The conventional 6063 composition range is Si: 0.2-0.6%, Fe: less than or equal to 0.35%, Cu: less than or equal to 0.1%, Mn: less than or equal to 0.1 percent, Mg: 0.45-0.90%, Ti: less than or equal to 0.1 percent; compared with 6063 alloy, the content of Si in the composition is controlled to be 0.25-0.35%, and is at the lowest limit of 6063, and the content of Mg is 0.35-0.45%, and is lower than the lowest limit of 6063. The hardness peak value of the raw material after extrusion and solid solution is reduced by reducing the contents of two elements for strengthening the hardness of the alloy, namely Mg and Si, and meanwhile, the contents of Mg and Si in a certain proportion are reserved, so that the hardness of the plate can be improved in a mode of strengthening by aging after the forming relieved tooth, and the subsequent processing requirement is met.
Mg 2 The strengthening mechanism of Si to the matrix is that Si can be dissolved into the aluminum alloy matrix at 490 ℃ or more to form a metastable structure. Mg solid-dissolved into the matrix with time in a natural standing state 2 Si is gradually precipitated and grown, and dislocation movement of the lattice structure of the aluminum matrix under the action of an external force is blocked,thereby improving the hardness and strength of the aluminum alloy. This effect is known as natural aging at room temperature and the change in properties due to parking is known as the parking effect. The aging strengthening effect can be obviously accelerated under the condition of artificial heating, so that the strength of the aluminum alloy can be industrially applied in a controllable way, and the aging strengthening effect is called artificial aging. Mg (magnesium) 2 The higher the Si content is, the greater the influence on the strength of the aluminum alloy material is. This patent controls Mg 2 The content of Si in the aluminum matrix and the adoption of reasonable heat treatment processes such as homogenization, quenching, aging and the like enable the aluminum alloy to have different processing characteristics at different stages so as to meet various functional requirements of the shovel tooth radiator.
In the above preparation method of the relieved tooth radiator, preferably, the homogenization treatment temperature is 560 +/-5 ℃, and the heat preservation time is 8-10 h.
Low Mg 2 After the aluminum alloy cast rod with the Si content is homogenized for 8-10h at the temperature of 560 +/-5 ℃, the composition structure segregation generated in the casting process of the cast rod can be effectively eliminated, and Mg 2 The Si strengthening phase can be fully dissolved in the aluminum alloy matrix, and partial Mg can be realized by two-stage cooling 2 The Si phase is evenly separated out, simultaneously the effect of coarsening without growing is achieved, and low Mg is provided for the aluminum extrusion process 2 An aluminum alloy cast rod raw material with Si content and full solid solution refining.
In the above method for manufacturing a tooth heat sink, preferably, the cooling process includes: firstly, cooling the cast ingot to 300 +/-50 ℃ for 30 +/-5 min; and cooling the cast ingot to below 100 ℃ for 60min +/-5.
Specifically, strong wind and small water can be firstly adopted for spray cooling for 30 +/-5 min to ensure that the temperature of the cast rod is reduced to 300 +/-50 ℃, and then strong wind and large water are adopted for spray cooling for 60min +/-5 to ensure that the temperature of the cast rod is reduced to below 100 ℃; wherein the diameter of the small water spray pipe is 8-12mm, and the diameter of the large water spray pipe is 25-35 mm. Strong wind and small water spray can promote the Mg dissolved in the cast rod 2 A small amount of Si strengthening phase is evenly precipitated, and the structure is stably kept in the extrusion process.
In the above preparation method of the relieved tooth heat radiator, preferably, the feeding temperature of the extrusion molding is 430 ± 5 ℃, and the discharging temperature is 470-490 ℃.
The heating temperature of the extrusion-molded aluminum alloy cast rod is 430 +/-5 ℃, the extrusion deformation molding is carried out to obtain the aluminum plate blank for the relieving heat radiator, the extrusion deformation and the frictional heat generation influence are applied to the aluminum plate blank, and the temperature of the extruded blank is increased to 470-490 ℃. The higher the temperature of the cast bar, the higher the temperature of the extruded billet, at the same extrusion speed. For ensuring that the temperature of the extruded stock is lower than Mg 2 The method limits the heating temperature of the aluminum alloy cast rod and the temperature of the extruded blank, thereby ensuring that the aluminum alloy cast rod is subjected to homogenization two-stage cooling to obtain a small amount of precipitated Mg 2 Si is not dissolved into the aluminum alloy matrix again due to overhigh temperature, so that the natural parking hardness increase possibly generated in the storage stage of the blank before the relieving is inhibited.
In the above method for manufacturing a relieved tooth heat sink, preferably, the solution heat treatment process includes: and cooling the plate with the temperature of 470-490 ℃ after extrusion molding by strong wind until the temperature of the plate is less than 250 ℃.
In the above method for manufacturing a tooth heat sink, preferably, in step S3, the aging temperature is 200 ± 5 ℃ and the time is 3 ± 0.1 h. Since the contents of Mg and Si are obviously lower than the standard range of 6063, if the temperature and the time are higher or lower than the standard range, the loss of hardness or strength after aging is caused, and thus the quality abnormity in the processing of the bottom plate can be caused.
In the above method for manufacturing a relieved tooth radiator, preferably, the melting process of the aluminum alloy ingot is as follows: and smelting the aluminum ingot until the aluminum ingot is melted, mixing, and then sequentially carrying out secondary refining, two-stage plate type filtering and casting to obtain the 6-series aluminum alloy round ingot.
Compared with the prior art, the invention has the advantages that:
the 6063 aluminum alloy with the 1060 aluminum alloy and low hardness and easy forming relieved tooth is obtained by optimizing component design, controlling casting homogenization and controlling an extrusion quenching process, the problem that the 6063 aluminum alloy is high in hardness and limited in forming relieved tooth height is effectively solved, and the maximum forming relieved tooth height can be increased to 70 mm; and the hardness of the 6063 aluminum alloy is improved to more than 52HB through aging heat treatment process control, the problems of cutting performance of the material and abnormal tapping and tooth sliding defects are obviously improved, a hole can be directly drilled and tapped on the aluminum base plate, the machining efficiency is effectively improved, and a link of increasing a threaded hole reducing nut is omitted. Therefore, the invention obviously shortens the processing period of the relieving heat radiator, improves the manufacturing qualification rate and reduces the processing cost.
Detailed Description
The invention is further described below with reference to specific preferred embodiments, without thereby limiting the scope of protection of the invention.
Example 1:
according to the preparation method of the relieving heat radiator, 6-series new alloy extrusion production is carried out on 229mm multiplied by 25mm aluminum alloy special-shaped extrusion plates, the hardness before aging meets the 1060 aluminum alloy equivalent relieving requirement, and after relieving aging, the hardness meets the working procedure requirements of machining an anti-sticking cutter and a thread hole-free reducer nut of a plantar plate machine. The preparation process comprises the following steps:
1) smelting:
heating a raw material aluminum ingot (with the purity of 99.70%) to 735 ℃ to melt the raw material aluminum ingot to obtain aluminum liquid, removing dross on the surface of the aluminum liquid, and preparing the aluminum liquid by the following chemical components: 0.28 percent of Si, 0.35 percent of Mg, 0.02 percent of Cu0.02 percent, 0.12 percent of Fe, 0.02 percent of Mn, 0.02 percent of Cr, 0.005 percent of Zn, 0.05 percent of Ti and the balance of Al, and refining and standing the alloy elements in the molten aluminum; filtering the aluminum liquid after standing, and then carrying out casting when cooling the aluminum liquid with water at the temperature of 23 ℃ for 60min to obtain an aluminum bar with the diameter of 308 mm;
2) homogenizing:
the round ingot is subjected to homogenization treatment at 560 ℃ in a homogenizing furnace, the temperature is kept for 8.2 hours, strong wind and small water are firstly adopted for cooling for 30min in a cooling furnace after being taken out of the furnace, and then the round ingot is cut into short ingots with different lengths of 600 plus 1000mm after being cooled for 60min by strong wind and large water. Wherein, the diameter of the small water pipe is 10mm, and the diameter of the large water pipe is 30 mm.
3) Extrusion molding:
extruding by using a 36MN tonnage positive single-action extruder, wherein the temperature of a cast rod is 430 +/-5 ℃, the extrusion speed is 6-8m/min, the temperature of a discharge port is 470-490 ℃, cooling is carried out by adopting strong wind after the discharge port of the plate, the wind speed is 20m/s, and the cooling time is 3min, so that the temperature after cooling is 230-235 ℃.
The obtained special-shaped plate has the hardness of 32 HB-37 HB, and after the special-shaped plate is parked for 48 hours, the hardness of 33 HB-38 HB is consistent with the hardness range of 1060 aluminum alloy.
4) Relieving machining: the maximum height of the relieving is improved to 80.2mm from 50mm through detection.
5) Aging heat treatment:
and (3) preserving the heat of the materials after the relieving for 3.1h in an aging furnace at 202 ℃ for aging treatment, wherein the hardness is increased from 33 HB-38 HB to 55-64HB, and the hardness data meets the requirement of the T5 heat treatment state of the 6-series aluminum alloy.
6) Machining:
the problem of cutter sticking and cutter breaking is effectively solved by drilling and tapping on the aluminum base plate.
Si：0.25～0.35％，Fe：≤0.20％，Cu：≤0.05％，Mn：≤0.07％，Mg：0.35～0.45％，Ti：≤0.025％；
Example 2:
according to the preparation method of the relieving heat radiator, 6-series new alloy extrusion production is carried out on 229mm multiplied by 25mm aluminum alloy special-shaped extrusion plates, the hardness before aging meets the 1060 aluminum alloy equivalent relieving requirement, and after relieving aging, the hardness meets the working procedure requirements of machining an anti-sticking cutter and a thread hole-free reducing nut of a sole plate machine. The preparation process comprises the following steps:
1) smelting:
heating a raw material aluminum ingot (with the purity of 99.70 percent) to 735 ℃ for melting to obtain aluminum liquid, removing scum on the surface of the aluminum liquid, and mixing the following components in percentage by weight: 0.25 percent of Si, 0.41 percent of Mg, 0.02 percent of Cu0.02 percent, 0.11 percent of Fe, 0.02 percent of Mn, 0.02 percent of Cr, 0.005 percent of Zn, 0.05 percent of Ti and the balance of Al, and refining and standing the alloy elements in the molten aluminum; filtering the aluminum liquid after standing, and then carrying out water cooling at the temperature of 26 ℃ for 62min for casting to obtain an aluminum bar with the diameter of 308 mm;
2) homogenizing:
the round cast ingot is subjected to 556 ℃ homogenization treatment in a homogenizing furnace, the heat preservation is carried out for 8.3 hours, the round cast ingot is cooled for 30 minutes by adopting strong wind and small water in a cooling furnace (a 35-ton casting rod cooling chamber) after being taken out of the furnace, and then is cut into 600-sand 950mm short ingots after being cooled for 61 minutes by adopting the strong wind and the large water. Wherein, the diameter of the small water pipe is 10mm, and the diameter of the large water pipe is 30 mm.
3) Extrusion forming:
extruding by using a 36MN tonnage positive single-action extruder, wherein the temperature of a cast rod is 420 +/-5 ℃, the extrusion speed is 8-10m/min, the temperature of a discharge port is 481-492 ℃, and the plate is cooled by strong wind after the discharge port, the wind speed is 20m/s, and the cooling time is 2.5min, so that the temperature of 258-265 ℃ after cooling is ensured.
The obtained special-shaped plate has the hardness of 30 HB-36 HB, and after the special-shaped plate is parked for 48.5 hours, the hardness of 34 HB-39HB is consistent with the hardness range of 1060 aluminum alloy.
4) Relieving machining: the maximum height of the relieving is improved from 50mm to 79.5mm through detection.
5) Aging heat treatment:
the materials after relieving are subjected to aging treatment for 3.1h at 203 ℃ in an aging furnace, the hardness is improved from 33 HB-38 HB to 56 HB-65 HB, and the hardness data meet the heat treatment state requirement of 6 series aluminum alloy T5.
6) Machining:
the problem of cutter sticking and cutter breaking is effectively solved by drilling and tapping on the aluminum base plate.
Example 3:
according to the preparation method of the relieving heat radiator, 6-series new alloy extrusion production is carried out on 229mm multiplied by 25mm aluminum alloy special-shaped extrusion plates, the hardness before aging meets the 1060 aluminum alloy equivalent relieving requirement, and after relieving aging, the hardness meets the working procedure requirements of machining an anti-sticking cutter and a thread hole-free reducing nut of a sole plate machine. The preparation process comprises the following steps:
1) smelting:
heating a raw material aluminum ingot (with the purity of 99.70%) to 735 ℃ to melt the raw material aluminum ingot to obtain aluminum liquid, removing dross on the surface of the aluminum liquid, and preparing the aluminum liquid by the following chemical components: 0.25 percent of Si, 0.41 percent of Mg, 0.02 percent of Cu0.02 percent, 0.11 percent of Fe, 0.02 percent of Mn, 0.02 percent of Cr, 0.005 percent of Zn, 0.05 percent of Ti and the balance of Al, and refining and standing the alloy elements in the molten aluminum; filtering the aluminum liquid after standing, and then carrying out water cooling at the temperature of 26 ℃ for 62min for casting to obtain an aluminum bar with the diameter of 308 mm;
2) homogenization treatment:
the round cast ingot is subjected to 556 ℃ homogenization treatment in a homogenizing furnace, the heat preservation is carried out for 8.3 hours, the round cast ingot is cooled for 30 minutes by adopting strong wind and small water in a cooling furnace (a 35-ton casting rod cooling chamber) after being taken out of the furnace, and then is cut into 600-sand 950mm short ingots after being cooled for 61 minutes by adopting the strong wind and the large water. Wherein, the diameter of the small water pipe is 10mm, and the diameter of the large water pipe is 30 mm.
3) Extrusion molding:
extruding by using a 36MN tonnage positive single-action extruder, wherein the temperature of a cast rod is 440 +/-5 ℃, the extrusion speed is 4-6m/min, the temperature of a discharge port is 460 plus one year, cooling by adopting strong wind after the discharge port of a plate is carried out, the wind speed is 22m/s, and the cooling time is 5min, so that the temperature after cooling is 212 plus one year and 220 ℃.
The obtained special-shaped plate has the hardness of 29 HB-34 HB, and after the special-shaped plate is parked for 48.2 hours, the hardness of 32 HB-37 HB is consistent with the hardness range of 1060 aluminum alloy.
4) Relieving machining: the maximum height of the relieving is improved to 76.1mm from 50mm through detection.
5) Aging heat treatment:
and (3) preserving the temperature of the materials subjected to tooth relieving for 3.1h in an aging furnace at 203 ℃, increasing the hardness from 32 HB-37 HB to 58-66 HB, and enabling the hardness data to meet the requirement of the heat treatment state of 6 series aluminum alloy T5.
6) Machining:
the problem of cutter sticking and cutter breaking is effectively solved by drilling and tapping on the aluminum base plate.
Comparative example 1:
according to the preparation method of the embodiment 1, 6-series new alloy extrusion production is carried out on 229mm multiplied by 25mm aluminum alloy special-shaped extrusion plates, except that in the step (3), the temperature of a cast rod is 480 +/-5 ℃, the extrusion speed is 4-6m/min, the temperature of a discharge port is 500 plus one year, the temperature of the discharge port is 520 ℃, and strong wind is adopted for cooling after the discharge port of the plate, the wind speed is 30m/s, and the cooling time is 5min, so that the temperature after cooling is 255 plus one year 265 ℃.
Comparative example 2
According to the preparation method of the embodiment 1, 6-series new alloy extrusion production is carried out on 229mm multiplied by 25mm aluminum alloy special-shaped extrusion plates, except that in the step (3), the temperature of a cast rod is 400 +/-5 ℃, the extrusion speed is 4-6m/min, the temperature of a discharge port is 430-452 ℃, and strong wind is adopted for cooling after the discharge port of the plate, the wind speed is 20m/s, and the cooling time is 5min, so that the temperature after cooling is 190-205 ℃.
Comparative example 3
According to the preparation method of the embodiment 1, 6-series new alloy extrusion production is carried out on 229mm multiplied by 25mm aluminum alloy special-shaped extrusion plates, except that in the step (2), round ingots are subjected to homogenization treatment at 560 ℃ in a homogenizing furnace, heat preservation is carried out for 8.3 hours, and after being taken out of the furnace, the round ingots are cooled for 240 minutes by strong wind in a cooling furnace (35 ton casting rod cooling chamber), and then the round ingots are cut into 1000-mm short ingots with different lengths.
Test example
The hardness before forming relieved teeth, the hardness after standing for 48 hours, the hardness after aging and the maximum height of the forming relieved teeth of the aluminum alloy special-shaped extruded plates processed in the examples 1 to 3 and the comparative examples 1 to 3 are measured.
The measurement results are shown in Table 1.
TABLE 1
As can be seen from the results in Table 1, the aluminum alloy extruded sheet processed in examples 1-3 has a hardness of 29-38HB before forming relieved tooth, a hardness of 32-39HB after standing for 48h, a maximum height of forming relieved tooth of 80.5-81.2mm, and a hardness of 55-66HB after aging.
The above description is only for the preferred embodiment of the present application and should not be taken as limiting the present application in any way, and although the present application has been disclosed in the preferred embodiment, it is not intended to limit the present application, and those skilled in the art should understand that they can make various changes and modifications within the technical scope of the present application without departing from the scope of the present application, and therefore all the changes and modifications can be made within the technical scope of the present application.
Claims (9)
1. A preparation method of a relieving heat radiator is characterized by comprising the following steps:
s1: preparing a 6 series aluminum alloy plate with the hardness of 32HB-39HB, wherein the aluminum alloy plate comprises the following components: si: 0.25 to 0.35%, Fe: less than or equal to 0.20 percent, Cu: less than or equal to 0.05 percent, Mn: less than or equal to 0.07 percent, Mg: 0.35-0.45%, Ti: less than or equal to 0.025 percent; the balance of Al and inevitable impurities; wherein the weight percentage of each impurity is up to 0.05%, and the total amount is up to 0.15%;
s2: performing relieving processing on the 6-series aluminum alloy plate obtained in the step S1 to form a relieving radiator semi-finished product with a bottom plate and radiating fins;
s3: carrying out aging heat treatment on the relieving heat radiator semi-finished product obtained in the step S2 until the hardness of the relieving heat radiator semi-finished product is raised to 55-64 HB;
s4: and (4) machining the relieved tooth radiator semi-finished product processed in the step (S3) to obtain a relieved tooth radiator finished product.
2. The method for manufacturing a tooth-forming heat sink according to claim 1, wherein in step S1, the 6-series aluminum alloy sheet is manufactured as follows:
s1.1: homogenizing the 6-series aluminum alloy ingot obtained by smelting, and cooling in sections;
s1.2: and (3) carrying out extrusion forming on the 6-series aluminum alloy cast ingot treated in the step (S1.1), and carrying out solution heat treatment on the extruded and formed plate to obtain the 6-series aluminum alloy plate.
3. The method for preparing a tooth forming radiator according to claim 2, wherein the homogenization treatment temperature is 560 ± 5 ℃ and the holding time is 8-10 h.
4. The method for preparing the relieved tooth radiator according to the claim 3, wherein the specific process of the sectional cooling is as follows: firstly, cooling the cast ingot to 300 +/-50 ℃ for 30 +/-5 min; and cooling the cast ingot to be below 100 ℃, wherein the cooling time is 60min +/-5.
5. The method for preparing a tooth radiator according to any one of claims 2-4, wherein the feeding temperature of the extrusion molding is 430 ± 5 ℃, and the discharging temperature is 470-490 ℃.
6. The method for preparing the tooth forming heat sink according to claim 5, wherein the solution heat treatment comprises the following steps: and (3) carrying out forced air cooling on the plate with the temperature of 470-490 ℃ after extrusion molding for 5-8min until the temperature of the plate is less than 250 ℃.
7. The method for preparing a tooth-forming heat sink according to any one of claims 1-4, wherein the aging heat treatment in step S3 is performed at 200 ± 5 ℃ for 3 ± 0.1 h.
8. The method for manufacturing the relieved tooth radiator according to any one of claims 2 to 4, wherein the melting process of the aluminum alloy ingot is as follows: and smelting the aluminum ingot until the aluminum ingot is melted, mixing, and then sequentially carrying out secondary refining, two-stage plate type filtering and casting to obtain the 6-series aluminum alloy round ingot.
9. A tooth heat sink made by the method of any one of claims 1-8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010735317.5A CN111906508B (en) | 2020-07-28 | 2020-07-28 | Relieving heat radiator and preparation method thereof |
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