CN114672703A - Processing technology of corrosion-resistant aluminum alloy foaming die casting - Google Patents
Processing technology of corrosion-resistant aluminum alloy foaming die casting Download PDFInfo
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- 238000005260 corrosion Methods 0.000 title claims abstract description 17
- 230000007797 corrosion Effects 0.000 title claims abstract description 17
- 238000004512 die casting Methods 0.000 title claims abstract description 14
- 238000005516 engineering process Methods 0.000 title claims abstract description 14
- 238000005187 foaming Methods 0.000 title claims abstract description 14
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 47
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000007788 liquid Substances 0.000 claims abstract description 32
- 238000003723 Smelting Methods 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 25
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000001257 hydrogen Substances 0.000 claims abstract description 16
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 16
- 239000012535 impurity Substances 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 239000011261 inert gas Substances 0.000 claims abstract description 8
- 239000004615 ingredient Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims description 35
- 238000005266 casting Methods 0.000 claims description 31
- 238000010438 heat treatment Methods 0.000 claims description 25
- 239000003795 chemical substances by application Substances 0.000 claims description 20
- 238000004321 preservation Methods 0.000 claims description 16
- 238000007670 refining Methods 0.000 claims description 16
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 10
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 10
- 238000004064 recycling Methods 0.000 claims description 10
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 5
- 239000004113 Sepiolite Substances 0.000 claims description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 5
- 238000000137 annealing Methods 0.000 claims description 5
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 5
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 5
- 238000000265 homogenisation Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000001103 potassium chloride Substances 0.000 claims description 5
- 235000011164 potassium chloride Nutrition 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 229910052624 sepiolite Inorganic materials 0.000 claims description 5
- 235000019355 sepiolite Nutrition 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- 239000011734 sodium Substances 0.000 claims description 5
- 235000010344 sodium nitrate Nutrition 0.000 claims description 5
- 239000004317 sodium nitrate Substances 0.000 claims description 5
- 238000004381 surface treatment Methods 0.000 claims description 5
- 239000002918 waste heat Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 abstract description 17
- 239000000956 alloy Substances 0.000 abstract description 17
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 229910052804 chromium Inorganic materials 0.000 abstract description 3
- 229910052748 manganese Inorganic materials 0.000 abstract description 3
- 229910052719 titanium Inorganic materials 0.000 abstract description 3
- 229910052721 tungsten Inorganic materials 0.000 abstract description 3
- 229910001369 Brass Inorganic materials 0.000 description 9
- 239000010951 brass Substances 0.000 description 9
- 229910052725 zinc Inorganic materials 0.000 description 8
- 239000011701 zinc Substances 0.000 description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910000881 Cu alloy Inorganic materials 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000009749 continuous casting Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 229910000776 Common brass Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- PVGBHEUCHKGFQP-UHFFFAOYSA-N sodium;n-[5-amino-2-(4-aminophenyl)sulfonylphenyl]sulfonylacetamide Chemical compound [Na+].CC(=O)NS(=O)(=O)C1=CC(N)=CC=C1S(=O)(=O)C1=CC=C(N)C=C1 PVGBHEUCHKGFQP-UHFFFAOYSA-N 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/003—Aluminium alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/113—Treating the molten metal by vacuum treating
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a processing technology of a corrosion-resistant aluminum alloy foaming die casting, which comprises the following steps: step 1: preparing materials: the following requirements are met according to the mass percent of the elements: 0.3-0.6% of Cu0.3-0.6%, 6.5-13.5% of Si0.35-0.65% of Mg0.35-0.2%, 0.35-1.2% of Zn0.5-1.3%, 0.35-0.5% of Mn0.2-0.5% of Ni0.2%, 0.1-0.35% of Sn0.2%, less than or equal to 0.2% of Pb, less than or equal to 0.3% of Ti, less than or equal to 0.1% of Cr, less than or equal to 0.1% of W, 0.01-0.15% of other impurity elements in total, and the balance of Al. According to the invention, high wear-resistant metal elements W, Mn, Cr and Ti are added in the ingredients, so that the stress corrosion resistance and the strength of the alloy are improved, and inert gas is filled in the smelting process, so that hydrogen and fine impurities in the aluminum liquid are brought to the surface, the hydrogen content in the aluminum liquid is reduced, and the aluminum liquid is in a vacuum state in the pouring process, so that bubbles in the aluminum liquid float upwards, and the generation of bubbles in the production process is avoided.
Description
Technical Field
The invention relates to the technical field of foaming die castings, in particular to a processing technology of corrosion-resistant aluminum alloy foaming die castings.
Background
The brass alloy is an alloy consisting of copper and zinc, and is divided into grades of brass alloys such as H62, H65, H68, H70, H85, H90 and the like according to the specific gravity of copper in the alloy, and the brass alloy has good mechanical property, processing property and corrosion resistance, and a part of the brass alloy also has higher conductivity, cutting property and wear resistance, so the brass alloy is the most widely used material in the copper alloy.
The brass alloy smelting process is a key ring for determining the distribution of alloy elements, gas content, slag inclusion volume fraction and final mechanical property, and the accurate control of tapping temperature and whether the temperature field in the melt is uniform or not are very important for preparing the ingot with qualified quality. Since the zinc element is the most important additive element in common brass alloy, and the melting point is only 419.6 ℃, the boiling point is also only 907 ℃, and the melting point is very low compared with the melting point 1084 ℃ of pure copper, the zinc element can boil and evaporate in the high-temperature smelting and heat preservation process, and can be oxidized in the air, which is the common fire spraying phenomenon. Since the volatilization of zinc can facilitate the removal of various gases (H2, O2) from the alloy melt, the flaming has become the main process means for degassing, deslagging and refining all high-zinc brass. In addition, for a certain brass alloy, the flaming temperature is determined, so that the high-zinc brass can be judged whether the tapping pouring temperature is reached or not according to the flaming degree and the flaming frequency
At present, in the traditional copper alloy casting process, because the addition of metal elements needs manual stirring, the labor intensity is high, the zinc element is unevenly distributed in an alloy melt, the flaming phenomenon is uneven, and the uninterrupted production of continuous feeding, continuous smelting and continuous casting cannot be achieved. Therefore, a new technical solution needs to be provided.
Disclosure of Invention
The invention aims to provide a processing technology of a corrosion-resistant aluminum alloy foaming die casting, which solves the problems that at present, in the traditional copper alloy casting technology, due to the addition of metal elements, manual stirring is needed, the labor intensity is high, the distribution of zinc elements in an alloy melt is uneven, the flaming phenomenon is uneven, and continuous production of continuous feeding, continuous smelting and continuous casting cannot be achieved.
In order to achieve the purpose, the invention provides the following technical scheme: the processing technology of the corrosion-resistant aluminum alloy foaming die casting comprises the following steps:
step 1: preparing materials: the following requirements are met according to the mass percent of the elements: 0.3-0.6% of Cu0.3-0.6%, 6.5-13.5% of Si0.35-0.65% of Mg0.35-0.2%, 0.35-1.2% of Zn0.5-1.3%, 0.35-0.5% of Mn0.2-0.5% of Ni0.2%, 0.1-0.35% of Sn0.2%, less than or equal to 0.2% of Pb, less than or equal to 0.3% of Ti, less than or equal to 0.1% of Cr, less than or equal to 0.1% of W, 0.01-0.15% of other impurity elements in total, and the balance of Al;
step 2: smelting: the method comprises the following steps of sequentially putting ingredients into a smelting furnace for smelting, controlling the temperature in the furnace to be 750-780 ℃, after feeding for 40-50 min, adding a covering agent for covering when molten aluminum appears in the furnace, starting stirring, adjusting components, adding a refining agent, refining and slagging off to obtain qualified components, injecting molten aluminum into a heat preservation furnace from the smelting furnace, standing the furnace at 740-790 ℃ for 20-30 min, simultaneously filling inert protective gas into the heat preservation furnace, wherein the pressure of filling the inert gas is as follows: 0.75MPa to 1.0MPa, so as to bring hydrogen and fine impurities in the aluminum liquid to the surface, thereby reducing the hydrogen content in the aluminum liquid;
and step 3: casting: the method comprises the following steps that aluminum liquid enters a crystallizer through a water discharging hole of a heat preservation furnace through an aluminum groove, a required casting is cast, the casting temperature is controlled to be 700-750 ℃, the casting speed is controlled to be 35-45 mm/min, the cooling water flow is controlled to be 1150-1250L/min, in the casting process, the crystallizer is vacuumized, the vacuum pressure is-10-13 MPa, and micro bubbles in the aluminum liquid can float upwards, so that the generation of bubbles is reduced;
and 4, step 4: and (3) heat treatment: after the surface treatment is carried out on the casting, the casting is subjected to homogenization annealing treatment, and the method comprises the following specific processes: heating to 350-400 ℃, preserving heat for 2-3 h, heating to 550-580 ℃ at 60-80 ℃ per hour, preserving heat for 5-9 h, cooling by a circulating cooling device, heating to 380-400 ℃ at 50-90 ℃ per hour, and preserving heat for 5-6 h; cooling to 150-180 ℃, preserving heat for 3-4 h, starting the circulating cooling device again for cooling, and cooling to room temperature, wherein the circulating cooling device can utilize heating residual heat for recycling, so that the waste heat recycling rate is improved, the cooling efficiency is increased, and the production cost is reduced;
in a preferred embodiment of the present invention, the covering agent is a mixture of 50 to 60% of glass and 40 to 50% of soda.
As a preferred embodiment of the invention, the refining agent is prepared from the following raw materials in parts by weight: 5-8 parts of potassium chloride, 3-5 parts of calcium fluoride, 3-5 parts of sodium nitrate, 5-8 parts of graphite powder, 8-10 parts of sodium fluosilicate, 5-8 parts of aluminum chloride, 8-10 parts of sepiolite, 5-8 parts of tree ash, 68-10 parts of Na2TiF, and 5-8 parts of NaF.
Compared with the prior art, the invention has the following beneficial effects:
the high wear-resistant metal elements W, Mn, Cr and Ti are added in the ingredients, so that the stress corrosion resistance and the strength of the alloy are improved, the inert gas is filled in the smelting process, hydrogen and fine impurities in the aluminum liquid are brought to the surface, so that the hydrogen content in the aluminum liquid is reduced, the aluminum liquid is in a vacuum state in the pouring process, so that bubbles in the aluminum liquid float upwards, and the generation of bubbles in the production process is avoided.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention provides a technical scheme that: the processing technology of the corrosion-resistant aluminum alloy foaming die casting comprises the following steps:
step 1: preparing materials: the following requirements are met according to the mass percent of the elements: 0.3-0.6% of Cu0.3-0.6%, 6.5-13.5% of Si0.35-0.65% of Mg0.35-0.2%, 0.35-1.2% of Zn0.5-1.3%, 0.35-0.5% of Mn0.2-0.5% of Ni0.2%, 0.1-0.35% of Sn0.2%, less than or equal to 0.2% of Pb, less than or equal to 0.3% of Ti, less than or equal to 0.1% of Cr, less than or equal to 0.1% of W, 0.01-0.15% of other impurity elements in total, and the balance of Al;
and 2, step: smelting: the method comprises the following steps of putting ingredients into a smelting furnace in sequence for smelting, controlling the temperature in the furnace to be 750 ℃, feeding for 40min, adding a covering agent for covering when molten aluminum appears in the furnace, starting stirring, adjusting components, adding a refining agent for refining and slagging off to obtain qualified components, injecting molten aluminum into a heat preservation furnace from the smelting furnace, standing and keeping the furnace temperature at 740 ℃ for 20min, and simultaneously filling inert protective gas into the heat preservation furnace under the pressure of the inert gas: 0.75MPaMPa, so as to bring hydrogen and fine impurities in the aluminum liquid to the surface, thereby reducing the hydrogen content in the aluminum liquid;
and step 3: casting: the method comprises the following steps that aluminum liquid enters a crystallizer through a water discharging hole of a heat preservation furnace through an aluminum groove to cast a required casting, the casting temperature is controlled at 700 ℃, the casting speed is controlled at 35mm/min, the cooling water flow is controlled at 1150L/min, and in the casting process, the crystallizer is vacuumized, the vacuum pressure is-10-13 MPa, micro bubbles in the aluminum liquid can float upwards, and therefore the generation of the bubbles is reduced;
and 4, step 4: and (3) heat treatment: after the surface treatment is carried out on the casting, the homogenization annealing treatment is carried out, and the concrete process is as follows: firstly heating to 350 ℃, preserving heat for 2 hours, heating to 550 ℃ at 60 ℃ per hour, preserving heat for 5 hours, then cooling by a circulating cooling device, heating to 380 ℃ at 50 ℃ per hour, and preserving heat for 5 hours; the temperature is reduced to 150 ℃ and is kept for 3h, the circulating cooling device is started again for cooling, and the cooling is carried out to the room temperature, the circulating cooling device can utilize the heating residual heat for recycling, so that the waste heat recycling rate is improved, the cooling efficiency is increased, and the production cost is reduced;
in a further improvement, the covering agent is a mixture of 50% glass and 50% soda.
In a further improvement, the refining agent is prepared from the following raw materials in parts by weight: 5 parts of potassium chloride, 3 parts of calcium fluoride, 3 parts of sodium nitrate, 5 parts of graphite powder, 8 parts of sodium fluosilicate, 5 parts of aluminum chloride, 8 parts of sepiolite, 5 parts of tree ash, Na2TiF68 and NaF 5.
Example 2
The invention provides a technical scheme that: the processing technology of the corrosion-resistant aluminum alloy foaming die casting comprises the following steps:
step 1: preparing materials: the following requirements are satisfied according to the mass percent of the elements: 0.3-0.6% of Cu0.3-0.6%, 6.5-13.5% of Si0.35-0.65% of Mg0.35-0.2%, 0.35-1.2% of Zn0.5-1.3%, 0.35-0.5% of Mn0.2-0.5% of Ni0.2%, 0.1-0.35% of Sn0.2%, less than or equal to 0.2% of Pb, less than or equal to 0.3% of Ti, less than or equal to 0.1% of Cr, less than or equal to 0.1% of W, 0.01-0.15% of other impurity elements in total, and the balance of Al;
step 2: smelting: the method comprises the following steps of sequentially putting ingredients into a smelting furnace for smelting, controlling the temperature in the furnace to 765 ℃, feeding for 45min, adding a covering agent for covering when molten aluminum appears in the furnace, starting stirring, adjusting components, adding a refining agent for refining and slagging off to obtain qualified components, injecting molten aluminum into a heat preservation furnace from the smelting furnace, standing and keeping the furnace temperature at 760 ℃ for 25min, simultaneously filling inert protective gas into the heat preservation furnace, wherein the pressure of filling the inert gas is as follows: 0.85MPa, so as to bring hydrogen and fine impurities in the aluminum liquid to the surface, thereby reducing the hydrogen content in the aluminum liquid;
and step 3: casting: the aluminum liquid enters the crystallizer through a water discharge hole of the heat preservation furnace through an aluminum groove to cast a required casting, the casting temperature is controlled at 725 ℃, the casting speed is controlled at 40mm/min, the cooling water flow is controlled at 1200L/min, and the crystallizer is vacuumized in the pouring process, the vacuum pressure is-12 MPa, so that micro bubbles in the aluminum liquid can float upwards, and the generation of bubbles is reduced;
and 4, step 4: and (3) heat treatment: after the surface treatment is carried out on the casting, the homogenization annealing treatment is carried out, and the concrete process is as follows: firstly heating to 380 ℃, preserving heat for 2.5h, heating to 570 ℃ at 70 ℃ per hour, preserving heat for 7h, then cooling by a circulating cooling device, heating to 390 ℃ at 70 ℃ per hour, and preserving heat for 5.5 h; the temperature is reduced to 170 ℃ and is kept for 3.5h, the circulating cooling device is started again for cooling and is cooled to room temperature, and the circulating cooling device can utilize the heating residual heat for recycling, so that the waste heat recycling rate is improved, the cooling efficiency is increased, and the production cost is reduced;
in a further improvement, the covering agent is a mixture of 55% glass and 45% soda.
In a further improvement, the refining agent is prepared from the following raw materials in parts by weight: potassium chloride 7, calcium fluoride 4, sodium nitrate 4, graphite powder 7, sodium fluosilicate 9, aluminum chloride 7, sepiolite 9, tree ash 7, Na2TiF69 and NaF 7.
Example 3
The invention provides a technical scheme that: the processing technology of the corrosion-resistant aluminum alloy foaming die casting comprises the following steps:
step 1: preparing materials: the following requirements are satisfied according to the mass percent of the elements: 0.3-0.6% of Cu0.3-0.6%, 6.5-13.5% of Si6, 0.35-0.65% of Mg0.35-1.2%, 0.5-1.3% of Fe0.35-0.5% of Mn0.2-0.5% of Ni0.2%, 0.1-0.35% of Sn0.2, less than or equal to 0.2% of Pb, less than or equal to 0.3% of Ti, less than or equal to 0.1% of Cr, less than or equal to 0.1% of W, 0.01-0.15% of other impurity elements in total, and the balance of Al, and carrying out material preparation;
step 2: smelting: the method comprises the following steps of putting ingredients into a smelting furnace in sequence for smelting, controlling the temperature in the furnace to be 780 ℃, feeding for 50min, adding a covering agent for covering when molten aluminum appears in the furnace, starting stirring, adjusting components, adding a refining agent for refining and slagging off to obtain qualified components, injecting molten aluminum into a heat preservation furnace from the smelting furnace, standing and keeping the furnace temperature at 790 ℃ for 30min, simultaneously filling inert protective gas into the heat preservation furnace, wherein the pressure of the inert gas is as follows: 1.0MPa, so as to bring hydrogen and fine impurities in the aluminum liquid to the surface, thereby reducing the hydrogen content in the aluminum liquid;
and step 3: casting: the aluminum liquid enters a crystallizer through a water discharge hole of the heat preservation furnace through an aluminum groove to cast a required casting, the casting temperature is controlled at 750 ℃, the casting speed is controlled at 45mm/min, the cooling water flow is controlled at 1250L/min, and the crystallizer is vacuumized in the pouring process, the vacuum pressure is-13 MPa, so that micro bubbles in the aluminum liquid can float upwards, and the generation of bubbles is reduced;
and 4, step 4: and (3) heat treatment: after the surface treatment is carried out on the casting, the homogenization annealing treatment is carried out, and the concrete process is as follows: heating to 400 ℃, preserving heat for 3 hours, heating to 580 ℃ at 80 ℃ per hour, preserving heat for 5-9 hours, cooling by a circulating cooling device, heating to 400 ℃ at 90 ℃ per hour, and preserving heat for 6 hours; the temperature is reduced to 180 ℃ and is kept for 4 hours, the circulating cooling device is started again for cooling, and the cooling is carried out to the room temperature, the circulating cooling device can utilize the heating residual heat for recycling, so that the waste heat recycling rate is improved, the cooling efficiency is increased, and the production cost is reduced;
in a further improvement, the covering agent is a mixture of 60% glass and 40% soda.
In a further improvement, the refining agent is prepared from the following raw materials in parts by weight: 8 parts of potassium chloride, 5 parts of calcium fluoride, 5 parts of sodium nitrate, 8 parts of graphite powder, 10 parts of sodium fluosilicate, 8 parts of aluminum chloride, 10 parts of sepiolite, 8 parts of tree ash, Na2TiF610 and NaF 8.
The high wear-resistant metal elements of W, Mn, Cr and Ti are added into the ingredients, so that the stress corrosion resistance and the strength of the alloy are improved, the inert gas is filled in the smelting process, hydrogen and fine impurities in the aluminum liquid are brought to the surface, so that the hydrogen content in the aluminum liquid is reduced, the aluminum liquid is in a vacuum state in the pouring process, so that bubbles in the aluminum liquid float upwards, and the generation of bubbles in the production process is avoided.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention as defined in the following claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The processing technology of the corrosion-resistant aluminum alloy foaming die casting is characterized by comprising the following steps of: the processing technology of the corrosion-resistant aluminum alloy foaming die casting comprises the following steps:
step 1: preparing materials: the following requirements are satisfied according to the mass percent of the elements: 0.3-0.6% of Cu0.3-0.6%, 6.5-13.5% of Si0.35-0.65% of Mg0.35-0.2%, 0.35-1.2% of Zn0.5-1.3%, 0.35-0.5% of Mn0.2-0.5% of Ni0.2%, 0.1-0.35% of Sn0.2%, less than or equal to 0.2% of Pb, less than or equal to 0.3% of Ti, less than or equal to 0.1% of Cr, less than or equal to 0.1% of W, 0.01-0.15% of other impurity elements in total, and the balance of Al;
step 2: smelting: the method comprises the following steps of sequentially putting ingredients into a smelting furnace for smelting, controlling the temperature in the furnace to be 750-780 ℃, after 40-50 min of feeding, adding a covering agent for covering when molten aluminum appears in the furnace, starting stirring, adjusting components, adding a refining agent for refining and slagging off to obtain qualified components, injecting molten aluminum into a heat preservation furnace from the smelting furnace, standing and keeping the furnace temperature at 740-790 ℃ for 20-30 min, simultaneously filling inert protective gas into the heat preservation furnace, wherein the pressure of filling the inert gas is as follows: 0.75MPa to 1.0MPa, so as to bring hydrogen and fine impurities in the aluminum liquid to the surface, thereby reducing the hydrogen content in the aluminum liquid;
and step 3: casting: the method comprises the following steps that aluminum liquid enters a crystallizer through a water discharging hole of a heat preservation furnace through an aluminum groove, a required casting is cast, the casting temperature is controlled to be 700-750 ℃, the casting speed is controlled to be 35-45 mm/min, the cooling water flow is controlled to be 1150-1250L/min, in the casting process, the crystallizer is vacuumized, the vacuum pressure is-10-13 MPa, and micro bubbles in the aluminum liquid can float upwards, so that the generation of bubbles is reduced;
and 4, step 4: and (3) heat treatment: after the surface treatment is carried out on the casting, the homogenization annealing treatment is carried out, and the concrete process is as follows: heating to 350-400 ℃, preserving heat for 2-3 h, heating to 550-580 ℃ at 60-80 ℃ per hour, preserving heat for 5-9 h, cooling by a circulating cooling device, heating to 380-400 ℃ at 50-90 ℃ per hour, and preserving heat for 5-6 h; and then cooling to 150-180 ℃ and preserving heat for 3-4 h, starting the circulating cooling device again to cool, and cooling to room temperature, wherein the circulating cooling device can utilize the heating residual heat for recycling, so that the waste heat recycling rate is improved, the cooling efficiency is increased, and the production cost is reduced.
2. The processing technology of the corrosion-resistant aluminum alloy foaming die casting according to claim 1, characterized in that: the covering agent is a mixture consisting of 50-60% of glass and 40-50% of soda.
3. The processing technology of the corrosion-resistant aluminum alloy foaming die casting according to claim 1, characterized in that: the refining agent is prepared from the following raw materials in parts by weight: 5-8 parts of potassium chloride, 3-5 parts of calcium fluoride, 3-5 parts of sodium nitrate, 5-8 parts of graphite powder, 8-10 parts of sodium fluosilicate, 5-8 parts of aluminum chloride, 8-10 parts of sepiolite, 5-8 parts of tree ash, 68-10 parts of Na2TiF, and 5-8 parts of NaF.
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| CN112981192A (en) * | 2021-02-07 | 2021-06-18 | 湖南普卡科技制造有限公司 | High-elongation aluminum alloy building material template die-casting material |
| CN114182142A (en) * | 2021-12-09 | 2022-03-15 | 东北轻合金有限责任公司 | Al-Si-Cu-Mg-Mn die-casting aluminum alloy and preparation method thereof |
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| US3856360A (en) * | 1970-10-30 | 1974-12-24 | Us Reduction Co | Aluminum base alloy die casting wheel |
| JP2006336044A (en) * | 2005-05-31 | 2006-12-14 | Hitachi Metals Ltd | Aluminum alloy casting and its manufacturing method |
| CN103014448A (en) * | 2012-12-01 | 2013-04-03 | 滁州佳诚模具制造有限公司 | Processing method of improved 6061 aluminum alloy refrigerator foaming die cast |
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Application publication date: 20220628 |