CN105088113A - Method for manufacturing aluminum alloy free forge piece for spaceflight - Google Patents
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Abstract
The invention provides a method for manufacturing an aluminum alloy free forge piece for spaceflight and relates to a method for manufacturing an aluminum alloy free forge piece. The method aims to solve the technical problems that an existing aluminum alloy free forge piece cannot have high strength, high corrosion resistance and low density at the same time so that the requirements for high strength, corrosion resistance and light weight of aluminum alloy materials in the spaceflight field cannot be met. The method comprises the steps of 1, preparing an aluminum alloy solution; 2, manufacturing a round cast ingot; 3, carrying out dual-stage homogenizing annealing treatment; 4, manufacturing forge piece blank; 5, carrying out free forging; 6, performing solid-solution hardening treatment; 7, performing cold deformation treatment; and 8, performing two-stage aging treatment. The method has the advantages that by optimizing alloy components and adopting the optimized solid solution and aging processes after forging, the requirement for the overall performance of the aluminum alloy free forge piece is met; the manufactured aluminum alloy free forge piece is good in surface quality, the finished forge piece in industrial production is good in performance, and the overall mechanical property is good.
Description
Technical field
The present invention relates to a kind of manufacture method of aluminium alloy open die forgings.
Background technology
Existing traditional high-strength/tenacity aluminum alloy, as Al-Zn-Mg-Cu system 7050 alloy, strength and toughness is high but not anti-corrosion; Medium weldability aluminium alloy, as Al-Zn-Mg system 7005 and 7020 alloy, anti-corrosion but intensity is lower, all cannot solve and there is while there is high strength high corrosion resisting property and the little problem of density, cannot meet that space industry is high-strength to aluminum alloy materials, anti-corrosion, the requirement of lightweight.
At present, a kind of open die forgings of a certain space flight product needed of China, requires that this kind of aluminium alloy open die forgings tensile strength reaches 460N/mm
2, Proof strength of non-proportional reaches 420N/mm
2, elongation after fracture reaches 8%, fracture toughness property is not less than 27MPam
1/2, density is not more than 2.8g/cm
3, stress corrosion performance is load 0.75 σ in the NaCl solution of 3.5% in soaking at room temperature in mass concentration
0.2rupture time is greater than 100h, can meet space industry to new diseases requirement.
Summary of the invention
The present invention seeks to solve aluminum current alloy free forging and cannot have the little problem of high strength and high corrosion resistance and density simultaneously, thus cannot meet that space industry is high-strength to aluminum alloy materials, anti-corrosion, the technical problem of the requirement of lightweight, and provide a kind of manufacture method of space flight aluminium alloy open die forgings.
The manufacture method of a kind of space flight aluminium alloy open die forgings of the present invention is carried out according to the following steps:
One, prepare aluminium alloy solution: according to mass percent Zn:5.5% ~ 7.5% of element, Mg:1.5% ~ 3.0%, Cu:0.2% ~ 0.55%, Zr:0.05% ~ 0.18%, Si :≤0.10%, Fe :≤0.15%, Mn:0.2% ~ 0.45%, Cr:0.005% ~ 0.1%, Ti:0.01% ~ 0.05%, the ratio of Sc:0.15% ~ 0.45% and surplus Al takes fine aluminium ingot respectively, fine copper ingot, pure magnesium ingot, pure zinc ingot, aluminum scandium alloy ingot, aluminium zirconium alloy ingot, aluminum titanium alloy ingot and aluminium titanium boron wire, then melting 8h ~ 10h under temperature is 740 DEG C ~ 760 DEG C conditions, obtain molten aluminium alloy,
Two, preparation circle ingot casting: by the molten aluminium alloy obtained in step one temperature be 700 DEG C ~ 750 DEG C, under casting speed is 40mm/min ~ 90mm/min, water coolant intensity be 0.03MPa ~ 0.06MPa and temperature of cooling water is the condition of 15 DEG C ~ 35 DEG C, to pour into diameter be 170mm and length is the round ingot casting of 3500mm ~ 5000mm;
Three, two-step homogenization anneal: round ingot casting step 2 obtained carries out two-step homogenization anneal, obtains the round ingot casting of annealing; Described two-step homogenization anneal is specially: round ingot casting step 2 obtained is incubated 8h ~ 10h under temperature is the condition of 350 DEG C ~ 360 DEG C, then be 350 DEG C ~ 360 DEG C from temperature and be warming up to 460 DEG C ~ 470 DEG C, be be incubated 18h ~ 20h under the condition of 460 DEG C ~ 470 DEG C in temperature, after coming out of the stove, naturally cool to room temperature;
Four, prepare forge piece blank reheating: the whole turning of surface scale of the round ingot casting of annealing step 3 obtained on lathe is fallen, and obtains the aluminium alloy round cast ingot that diameter is 162mm, then sawing becomes length to be the forge piece blank reheating of 500mm;
Five, open die forging: length step 4 obtained is the forge piece blank reheating of 500mm is heat 5h ~ 7h in the resistance heading furnace of 430 DEG C ~ 450 DEG C in temperature, be cooled to 380 DEG C ~ 400 DEG C, then under temperature is 380 DEG C ~ 400 DEG C conditions, carries out three pulling open die forgings, is of a size of (150mm ~ 160mm) × cubes the forging of (160mm ~ 170mm) × (350mm ~ 360mm);
Six, solid solution and quench treatment: the cubes forging milling on milling machine obtaining step 5 to be of a size of (150mm ~ 160mm) × (160mm ~ 170mm) × (350mm ~ 360mm) becomes to be of a size of the cubes open die forgings of (135mm ~ 145mm) × (145mm ~ 155mm) × (335mm ~ 345mm), be be incubated 180min ~ 200min in the salt bath furnace of 470 DEG C ~ 480 DEG C in temperature, in 30s, be transferred to temperature is in the water of 30 DEG C ~ 40 DEG C, and be the quenching-in water of 30 DEG C ~ 40 DEG C in temperature, obtain the aluminum alloy forge piece after quenching;
Seven, cold deformation process: the aluminum alloy forge piece after the quenching obtained in step 6 is applied on 10,000 tons of swaging machines 3% ~ 5% deflection and carry out deformation at room temperature process, obtain the aluminum alloy forge piece after deformation process;
Eight, two-stage time effect process: the aluminum alloy forge piece of cold deformation process step 7 obtained carries out two-stage time effect process; Described two-stage time effect process is specially: the aluminum alloy forge piece of cold deformation process step 7 obtained is incubated 6h ~ 10h at temperature is 120 DEG C ~ 130 DEG C, then be 120 DEG C ~ 130 DEG C from temperature and be warming up to 150 DEG C ~ 160 DEG C, be be incubated 8h ~ 10h under the condition of 150 DEG C ~ 160 DEG C in temperature, naturally cool to room temperature, on milling machine, milling face becomes to be of a size of the aluminium alloy open die forgings of 130mm × 140mm × 330mm, obtains space flight aluminium alloy open die forgings.
Advantage of the present invention:
The present invention is by optimized alloy composition, solid solution and the aging technique of optimization is adopted after forging, reach the over-all properties demand of aluminium alloy open die forgings, the surface quality of the aluminium alloy open die forgings of preparation is good, in industrial production, finished product forging performance is good, comprehensive mechanical property is excellent, tests T7452 state open die forgings tensile strength be greater than 460N/mm by GB/T228 " metallic substance tensile testing at ambient temperature "
2, Proof strength of non-proportional is greater than 420N/mm
2, elongation after fracture is greater than 8%, fracture toughness property is greater than 27MPam
1/2; The stress corrosion performance testing T7452 state aluminium alloy open die forgings by GB/T22640 " the ring specimen stress corrosion (cracking) test method of aluminium alloy converted products " is load 0.75 σ in the NaCl solution of 3.5% in soaking at room temperature in mass concentration
0.2rupture time is greater than 100h; Density is less than 2.8g/cm
3.
Embodiment
Embodiment one: present embodiment is a kind of manufacture method of space flight aluminium alloy open die forgings, specifically carries out according to the following steps:
One, prepare aluminium alloy solution: according to mass percent Zn:5.5% ~ 7.5% of element, Mg:1.5% ~ 3.0%, Cu:0.2% ~ 0.55%, Zr:0.05% ~ 0.18%, Si :≤0.10%, Fe :≤0.15%, Mn:0.2% ~ 0.45%, Cr:0.005% ~ 0.1%, Ti:0.01% ~ 0.05%, the ratio of Sc:0.15% ~ 0.45% and surplus Al takes fine aluminium ingot respectively, fine copper ingot, pure magnesium ingot, pure zinc ingot, aluminum scandium alloy ingot, aluminium zirconium alloy ingot, aluminum titanium alloy ingot and aluminium titanium boron wire, then melting 8h ~ 10h under temperature is 740 DEG C ~ 760 DEG C conditions, obtain molten aluminium alloy,
Two, preparation circle ingot casting: by the molten aluminium alloy obtained in step one temperature be 700 DEG C ~ 750 DEG C, under casting speed is 40mm/min ~ 90mm/min, water coolant intensity be 0.03MPa ~ 0.06MPa and temperature of cooling water is the condition of 15 DEG C ~ 35 DEG C, to pour into diameter be 170mm and length is the round ingot casting of 3500mm ~ 5000mm;
Three, two-step homogenization anneal: round ingot casting step 2 obtained carries out two-step homogenization anneal, obtains the round ingot casting of annealing; Described two-step homogenization anneal is specially: round ingot casting step 2 obtained is incubated 8h ~ 10h under temperature is the condition of 350 DEG C ~ 360 DEG C, then be 350 DEG C ~ 360 DEG C from temperature and be warming up to 460 DEG C ~ 470 DEG C, be be incubated 18h ~ 20h under the condition of 460 DEG C ~ 470 DEG C in temperature, after coming out of the stove, naturally cool to room temperature;
Four, prepare forge piece blank reheating: the whole turning of surface scale of the round ingot casting of annealing step 3 obtained on lathe is fallen, and obtains the aluminium alloy round cast ingot that diameter is 162mm, then sawing becomes length to be the forge piece blank reheating of 500mm;
Five, open die forging: length step 4 obtained is the forge piece blank reheating of 500mm is heat 5h ~ 7h in the resistance heading furnace of 430 DEG C ~ 450 DEG C in temperature, be cooled to 380 DEG C ~ 400 DEG C, then under temperature is 380 DEG C ~ 400 DEG C conditions, carries out three pulling open die forgings, is of a size of (150mm ~ 160mm) × cubes the forging of (160mm ~ 170mm) × (350mm ~ 360mm);
Six, solid solution and quench treatment: the cubes forging milling on milling machine obtaining step 5 to be of a size of (150mm ~ 160mm) × (160mm ~ 170mm) × (350mm ~ 360mm) becomes to be of a size of the cubes open die forgings of (135mm ~ 145mm) × (145mm ~ 155mm) × (335mm ~ 345mm), be be incubated 180min ~ 200min in the salt bath furnace of 470 DEG C ~ 480 DEG C in temperature, in 30s, be transferred to temperature is in the water of 30 DEG C ~ 40 DEG C, and be the quenching-in water of 30 DEG C ~ 40 DEG C in temperature, obtain the aluminum alloy forge piece after quenching;
Seven, cold deformation process: the aluminum alloy forge piece after the quenching obtained in step 6 is applied on 10,000 tons of swaging machines 3% ~ 5% deflection and carry out deformation at room temperature process, obtain the aluminum alloy forge piece after deformation process;
Eight, two-stage time effect process: the aluminum alloy forge piece of cold deformation process step 7 obtained carries out two-stage time effect process; Described two-stage time effect process is specially: the aluminum alloy forge piece of cold deformation process step 7 obtained is incubated 6h ~ 10h at temperature is 120 DEG C ~ 130 DEG C, then be 120 DEG C ~ 130 DEG C from temperature and be warming up to 150 DEG C ~ 160 DEG C, be be incubated 8h ~ 10h under the condition of 150 DEG C ~ 160 DEG C in temperature, naturally cool to room temperature, on milling machine, milling face becomes to be of a size of the aluminium alloy open die forgings of 130mm × 140mm × 330mm, obtains space flight aluminium alloy open die forgings.
Embodiment two: the difference of present embodiment and embodiment one is: the purity of the fine aluminium ingot described in step one is greater than 99.7%.Other are identical with embodiment one.
Embodiment three: the difference of present embodiment and embodiment one or two is: in the aluminium titanium boron wire described in step one, the massfraction of titanium is 5%, the massfraction of boron is 0.2%, and all the other are aluminium.Other are identical with embodiment one or two.
Embodiment four: the difference of present embodiment and embodiment one to three is: in step 2 by the molten aluminium alloy obtained in step one temperature be 750 DEG C, under casting speed is 60mm/min, water coolant intensity be 0.06MPa and temperature of cooling water is the condition of 25 DEG C, to pour into diameter be 170mm and length is the round ingot casting of 3500mm.Other are identical with embodiment one to three.
Embodiment five: the difference of present embodiment and embodiment one to four is: round ingot casting step 2 obtained in step 3 carries out two-step homogenization anneal, obtains the round ingot casting of annealing; Described two-step homogenization anneal is specially: round ingot casting step 2 obtained is be incubated 10h under the condition of 360 DEG C in temperature, then be 360 DEG C from temperature and be warming up to 470 DEG C, be be incubated 20h under the condition of 470 DEG C in temperature, after coming out of the stove, naturally cool to room temperature.Other are identical with embodiment one to four.
Embodiment six: the difference of present embodiment and embodiment one to five is: the heating medium of the salt bath furnace described in step 6 by massfraction be 25% saltpetre and massfraction be that 75% SODIUMNITRATE forms.Other are identical with embodiment one to five.
Embodiment seven: the difference of present embodiment and embodiment one to six is: the two-stage time effect process described in step 8 is specially: the aluminum alloy forge piece of cold deformation process step 7 obtained is incubated 8h at temperature is 130 DEG C, then be 130 DEG C from temperature and be warming up to 160 DEG C, be be incubated 10h under the condition of 160 DEG C in temperature, naturally cool to room temperature, on milling machine, milling face becomes to be of a size of the aluminium alloy open die forgings of 130mm × 140mm × 330mm, obtains space flight aluminium alloy open die forgings.Other are identical with embodiment one to six.
By following verification experimental verification beneficial effect of the present invention:
Test one: this test is a kind of manufacture method of space flight aluminium alloy open die forgings, specifically carries out according to the following steps:
One, aluminium alloy solution is prepared: take fine aluminium ingot, fine copper ingot, pure magnesium ingot, pure zinc ingot, aluminum scandium alloy ingot, aluminium zirconium alloy ingot, aluminum titanium alloy ingot and aluminium titanium boron wire respectively according to the ratio of the mass percent Zn:6.3% of element, Mg:2.2%, Cu:0.4%, Zr:0.1%, Si:0.05%, Fe:0.08%, Mn:0.3%, Cr:0.05%, Ti:0.03%, Sc:0.28% and surplus Al, then melting 9h under temperature is 750 DEG C of conditions, obtains molten aluminium alloy;
Two, preparation circle ingot casting: by the molten aluminium alloy obtained in step one temperature be 725 DEG C, under casting speed is 65mm/min, water coolant intensity be 0.035MPa and temperature of cooling water is the condition of 25 DEG C, to pour into diameter be 170mm and length is the round ingot casting of 5000mm;
Three, two-step homogenization anneal: round ingot casting step 2 obtained carries out two-step homogenization anneal, obtains the round ingot casting of annealing; Described two-step homogenization anneal is specially: round ingot casting step 2 obtained is be incubated 10h under the condition of 355 DEG C in temperature, then be 355 DEG C from temperature and be warming up to 465 DEG C, be be incubated 18h under the condition of 465 DEG C in temperature, after coming out of the stove, naturally cool to room temperature;
Four, prepare forge piece blank reheating: the whole turning of surface scale of the round ingot casting of annealing step 3 obtained on lathe is fallen, and obtains the aluminium alloy round cast ingot that diameter is 162mm, then sawing becomes length to be the forge piece blank reheating of 500mm;
Five, open die forging: length step 4 obtained is the forge piece blank reheating of 500mm is heat 6h in the resistance heading furnace of 440 DEG C in temperature, be cooled to 390 DEG C, then under temperature is 390 DEG C of conditions, carries out three pulling open die forgings, obtains the cubes forging being of a size of 150mm × 160mm × 350mm;
Six, solid solution and quench treatment: the cubes forging milling on milling machine obtaining step 5 to be of a size of 150mm × 160mm × 350mm becomes to be of a size of the cubes open die forgings of 135mm × 145mm × 335mm, be be incubated 180min in the salt bath furnace of 470 DEG C in temperature, in 30s, be transferred to temperature is in the water of 35 DEG C, and be the quenching-in water of 35 DEG C in temperature, obtain the aluminum alloy forge piece after quenching;
Seven, cold deformation process: the aluminum alloy forge piece after the quenching obtained in step 6 is applied 4% deflection on 10,000 tons of swaging machines and carries out deformation at room temperature process, obtain the aluminum alloy forge piece after deformation process;
Eight, two-stage time effect process: the aluminum alloy forge piece of cold deformation process step 7 obtained carries out two-stage time effect process; Described two-stage time effect process is specially: the aluminum alloy forge piece of cold deformation process step 7 obtained is incubated 8h at temperature is 120 DEG C, then be 120 DEG C from temperature and be warming up to 150 DEG C, be be incubated 8h under the condition of 150 DEG C in temperature, naturally cool to room temperature, on milling machine, milling face becomes to be of a size of the aluminium alloy open die forgings of 130mm × 140mm × 330mm, obtains space flight aluminium alloy open die forgings.
The purity of the fine aluminium ingot described in step one is greater than 99.7%; In aluminium titanium boron wire described in step one, the massfraction of titanium is 5%, and the massfraction of boron is 0.2%, and all the other are aluminium; The heating medium of the salt bath furnace described in step 6 by massfraction be 25% saltpetre and massfraction be that 75% SODIUMNITRATE forms.
It is 515N/mm that the space flight aluminium alloy open die forgings that this test obtains tests T7452 state forging tensile strength by GB/T228 " metallic substance tensile testing at ambient temperature "
2, Proof strength of non-proportional is 480N/mm
2, elongation after fracture is 12%, fracture toughness is 36MPam
1/2; Tested the stress corrosion performance of T7452 state aluminum alloy forge piece by GB/T22640 " the ring specimen stress corrosion (cracking) test method of aluminium alloy converted products ", soaking at room temperature is in 3.5%NaCl solution and load 360N/mm
2stress condition under, sample ruptures not yet after 600h; Density is 2.78g/cm
3.
The space flight aluminium alloy open die forgings of this test preparation can be applied as space flight T7452 state aluminium alloy open die forgings.
Claims (7)
1. a space flight manufacture method for aluminium alloy open die forgings, is characterized in that the manufacture method of space flight aluminium alloy open die forgings is carried out according to the following steps:
One, prepare aluminium alloy solution: according to mass percent Zn:5.5% ~ 7.5% of element, Mg:1.5% ~ 3.0%, Cu:0.2% ~ 0.55%, Zr:0.05% ~ 0.18%, Si :≤0.10%, Fe :≤0.15%, Mn:0.2% ~ 0.45%, Cr:0.005% ~ 0.1%, Ti:0.01% ~ 0.05%, the ratio of Sc:0.15% ~ 0.45% and surplus Al takes fine aluminium ingot respectively, fine copper ingot, pure magnesium ingot, pure zinc ingot, aluminum scandium alloy ingot, aluminium zirconium alloy ingot, aluminum titanium alloy ingot and aluminium titanium boron wire, then melting 8h ~ 10h under temperature is 740 DEG C ~ 760 DEG C conditions, obtain molten aluminium alloy,
Two, preparation circle ingot casting: by the molten aluminium alloy obtained in step one temperature be 700 DEG C ~ 750 DEG C, under casting speed is 40mm/min ~ 90mm/min, water coolant intensity be 0.03MPa ~ 0.06MPa and temperature of cooling water is the condition of 15 DEG C ~ 35 DEG C, to pour into diameter be 170mm and length is the round ingot casting of 3500mm ~ 5000mm;
Three, two-step homogenization anneal: round ingot casting step 2 obtained carries out two-step homogenization anneal, obtains the round ingot casting of annealing; Described two-step homogenization anneal is specially: round ingot casting step 2 obtained is incubated 8h ~ 10h under temperature is the condition of 350 DEG C ~ 360 DEG C, then be 350 DEG C ~ 360 DEG C from temperature and be warming up to 460 DEG C ~ 470 DEG C, be be incubated 18h ~ 20h under the condition of 460 DEG C ~ 470 DEG C in temperature, after coming out of the stove, naturally cool to room temperature;
Four, prepare forge piece blank reheating: the whole turning of surface scale of the round ingot casting of annealing step 3 obtained on lathe is fallen, and obtains the aluminium alloy round cast ingot that diameter is 162mm, then sawing becomes length to be the forge piece blank reheating of 500mm;
Five, open die forging: length step 4 obtained is the forge piece blank reheating of 500mm is heat 5h ~ 7h in the resistance heading furnace of 430 DEG C ~ 450 DEG C in temperature, be cooled to 380 DEG C ~ 400 DEG C, then under temperature is 380 DEG C ~ 400 DEG C conditions, carries out three pulling open die forgings, is of a size of (150mm ~ 160mm) × cubes the forging of (160mm ~ 170mm) × (350mm ~ 360mm);
Six, solid solution and quench treatment: the cubes forging milling on milling machine obtaining step 5 to be of a size of (150mm ~ 160mm) × (160mm ~ 170mm) × (350mm ~ 360mm) becomes to be of a size of the cubes open die forgings of (135mm ~ 145mm) × (145mm ~ 155mm) × (335mm ~ 345mm), be be incubated 180min ~ 200min in the salt bath furnace of 470 DEG C ~ 480 DEG C in temperature, in 30s, be transferred to temperature is in the water of 30 DEG C ~ 40 DEG C, and be the quenching-in water of 30 DEG C ~ 40 DEG C in temperature, obtain the aluminum alloy forge piece after quenching;
Seven, cold deformation process: the aluminum alloy forge piece after the quenching obtained in step 6 is applied on 10,000 tons of swaging machines 3% ~ 5% deflection and carry out deformation at room temperature process, obtain the aluminum alloy forge piece after deformation process;
Eight, two-stage time effect process: the aluminum alloy forge piece of cold deformation process step 7 obtained carries out two-stage time effect process; Described two-stage time effect process is specially: the aluminum alloy forge piece of cold deformation process step 7 obtained is incubated 6h ~ 10h at temperature is 120 DEG C ~ 130 DEG C, then be 120 DEG C ~ 130 DEG C from temperature and be warming up to 150 DEG C ~ 160 DEG C, be be incubated 8h ~ 10h under the condition of 150 DEG C ~ 160 DEG C in temperature, naturally cool to room temperature, on milling machine, milling face becomes to be of a size of the aluminium alloy open die forgings of 130mm × 140mm × 330mm, obtains space flight aluminium alloy open die forgings.
2. the manufacture method of a kind of space flight aluminium alloy open die forgings according to claim 1, is characterized in that the purity of the fine aluminium ingot described in step one is greater than 99.7%.
3. the manufacture method of a kind of space flight aluminium alloy open die forgings according to claim 1, is characterized in that the massfraction of titanium in the aluminium titanium boron wire described in step one is 5%, and the massfraction of boron is 0.2%, and all the other are aluminium.
4. the manufacture method of a kind of space flight aluminium alloy open die forgings according to claim 1, it is characterized in that in step 2 by the molten aluminium alloy obtained in step one temperature be 750 DEG C, under casting speed is 60mm/min, water coolant intensity be 0.06MPa and temperature of cooling water is the condition of 25 DEG C, to pour into diameter be 170mm and length is the round ingot casting of 3500mm.
5. the manufacture method of a kind of space flight aluminium alloy open die forgings according to claim 1, is characterized in that round ingot casting step 2 obtained in step 3 carries out two-step homogenization anneal, obtains the round ingot casting of annealing; Described two-step homogenization anneal is specially: round ingot casting step 2 obtained is be incubated 10h under the condition of 360 DEG C in temperature, then be 360 DEG C from temperature and be warming up to 470 DEG C, be be incubated 20h under the condition of 470 DEG C in temperature, after coming out of the stove, naturally cool to room temperature.
6. the manufacture method of a kind of space flight aluminium alloy open die forgings according to claim 1, it is characterized in that the heating medium of the salt bath furnace described in step 6 by massfraction be 25% saltpetre and massfraction be that 75% SODIUMNITRATE forms.
7. the manufacture method of a kind of space flight aluminium alloy open die forgings according to claim 1, it is characterized in that the two-stage time effect process described in step 8 is specially: the aluminum alloy forge piece of cold deformation process step 7 obtained is incubated 8h at temperature is 130 DEG C, then be 130 DEG C from temperature and be warming up to 160 DEG C, be be incubated 10h under the condition of 160 DEG C in temperature, naturally cool to room temperature, on milling machine, milling face becomes to be of a size of the aluminium alloy open die forgings of 130mm × 140mm × 330mm, obtains space flight aluminium alloy open die forgings.
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