CN106399881A - Technique for improving performances of 7075 aluminum alloy extruded material - Google Patents
Technique for improving performances of 7075 aluminum alloy extruded material Download PDFInfo
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- CN106399881A CN106399881A CN201611008250.5A CN201611008250A CN106399881A CN 106399881 A CN106399881 A CN 106399881A CN 201611008250 A CN201611008250 A CN 201611008250A CN 106399881 A CN106399881 A CN 106399881A
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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
- C22F1/053—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 zinc as the next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
- B21C29/003—Cooling or heating of work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
- B21C29/02—Cooling or heating of containers for metal to be extruded
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C31/00—Control devices, e.g. for regulating the pressing speed or temperature of metal; Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- Engineering & Computer Science (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Extrusion Of Metal (AREA)
Abstract
The invention provides a technique for improving the performances of a 7075 aluminum alloy extruding material. The technique comprises the following concrete technological steps: heating an alloy ingot manufactured from the 7075 alloy material; heating a mold and an extruding cylinder; putting the heated mold and ingot into an extruder and extruding; performing solution treatment on the extruded extruding material; quenching the extruding material which is subjected to the solution treatment; stretching the quenched extruding material; ageing the stretched extruding material. The invention also provides the alloy ingot used in the method, and the ingot comprises the following components in percentage by weight: smaller than or equal to 0.40% of Si, smaller than or equal to 0.50% of Fe, 1.5% to 2.0% of Cu, smaller than or equal to 0.3% of Mn, 2.5% to 2.9% of Mg, 0.20% to 0.28% of Cr, 5.5% to 5.9% of Zn, smaller than or equal to 0.2% of Ti, smaller than or equal to 0.05% of other single elements, other impurity elements and the balance Al, wherein the total amount of other impurity elements is smaller than or equal to 0.15%.
Description
Technical field
The invention belongs to field of aluminum alloys, particularly to a kind of process improving 7075 Aluminum alloy extrusion material performances.
Background technology
7075 alloys are because specific strength is high, density is low, corrosion resistance excellent the features such as be widely used in aerospace field.
In the national and foreign standards such as GB/T6892 and AMS-QQ-A-200/11, the room temperature tensile of 7075 alloy T6511 state squeeze woods
Can index be：Tensile strength >=540MPa, yield strength >=480MPa, elongation after fracture >=7%.Because 7075 alloy extrusion are difficult
Degree is big, complex manufacturing, directly results in low production efficiency, energy consumption height, the low problem of room temperature tensile properties.For this reason,
Colleges and universities of scientific research institutions and aluminum processing enterprise are targetedly studied.
Patent CN 1807004A《7075 aluminium alloy profile on line quenching method》Propose a kind of 7075 aluminium alloy extrusions to exist
Line process for quenching and press quenching system, it is possible to achieve the press quenching of 7075 aluminium alloy extrusions, compared with out-line quenching, produce
Efficiency improves and production cost substantially reduces.But the online hollow heating furnace that this patent is related to is resistance heating or line-frequency induction adds
Pyrogen is managed, and will have obvious restriction to extrusion speed, and otherwise be difficult at short notice squeeze wood is heated to 440 DEG C -490 DEG C, because
This hollow heating furnace length and internal diameter size need to consider product specification and extrusion speed, the adaptability to different section squeeze wood
Difference.
Patent CN 103614673A《A kind of quick aging heat treatment method of achievable aluminium alloy》Propose a kind of positive and negative
The quick aging thermal treating process of electric pulse, the institution of prescription of employing is 100-125 DEG C × 4-24h, shortens peak aging time,
Improve the intensity of material, but the room temperature tensile performance that described embodiment reaches is 552.10MPa to the maximum, yield strength is
411.27MPa, elongation percentage is 10%, and described intensity does not reach numerical requirements in GB/T6892 and AMS-QQ-A-200/11.
At present, aluminium extrusion industry does not have a kind of process program, can significantly improve 7075 alloy extrusion material tensile properties, and
Can make that production efficiency is higher or energy consumption is relatively low.
In view of this, the special proposition present invention.
Content of the invention
The first object of the present invention is to provide a kind of process improving 7075 Aluminum alloy extrusion material performances, can be notable
Improve its room temperature tensile properties, heat treatment energy consumption can be reduced again, shorten heat treatment time.
The second object of the present invention is to provide the alloy pig material being applied to methods described, and described material passes through strict control
In alloyage the percentage composition of each element come to realize alloy material optimization purpose.
Described purpose is achieved by the following scheme：
A kind of process improving 7075 Aluminum alloy extrusion material performances, concrete technology step is as follows：
1) heat the ingot that described 7075 alloy materials are made；
2) heating mould and recipient；
3) mould after heating and ingot are added and extruded after extruder；
4) solution treatment is carried out to the squeeze wood after extruding；
5) squeeze wood after solution treatment is quenched；
6) squeeze wood after stretching quenching；
7) Ageing Treatment is carried out to the squeeze wood after stretching.
Quenching and preserving heat temperature and time is controlled in smaller range, improves the stability of product quality；Solid solution is incubated
Time can be adjusted flexibly according to squeeze wood wall thickness size, beneficial to the optimal solid solution effect of guarantee；After quenching squeeze wood is entered
Row largely stretcher strain, it is possible to increase the dislocation density of material internal and crystal boundary, promotes hardening constituent in ag(e)ing process
Disperse educt, compared with national and foreign standards requirement, the mechanical properties of material are significantly improved.
Preferably, described step 1) in, ingot is heated to 350-410 DEG C.
Preferably, described step 2) in, mould is heated to 420-460 DEG C it is preferable that heating the recipient of extruder
To 410-440 DEG C.
Preferably, described step 3) in extruded velocity be 1m/min-5m/min.
Preferably, described step 4) in solution treatment specifically include, by extruding after squeeze wood be heated to 462 DEG C -475
DEG C it is incubated it is preferable that temperature retention time is 30min-270min.
Preferably, described step 5) in Quenching Treatment, specifically include, by insulation after squeeze wood quickly put in water
Row cooling treatment, coolant water temperature controls below 50 DEG C.
Preferably, described step 6) in, carry out the stretching of 2%-4.5% along squeeze wood length direction.
Preferably, described step 7) in Ageing Treatment include, by the squeeze wood after stretch processing in 110 DEG C of -150 DEG C of models
Enclose inside holding 13 hours -16 hours.
Compared with row industry routine aging time 23 hours～25 hours, the present invention is greatly shortened aging time.
When heretofore described solid solution holding temperature and time, artificial aging temperature and time parameter select, holding temperature
The temperature retention time during upper limit is selected to want prioritizing selection lower limit, holding temperature selects temperature retention time during lower limit to want the prioritizing selection upper limit, no
Then it is likely to result in tensile property to fall flat.
Another aspect of the present invention is related to a kind of alloy pig, described alloy include by weight percentage with the following group
Point：
Si：≤ 0.40%, Fe：≤ 0.50%, Cu：1.5-2.0%, Mn：≤ 0.3%, Mg：2.5-2.9%, Cr：0.20-
0.28%th, Zn：5.5-5.9%, Ti：≤ 0.2%, other individual element≤0.05%, other impurities element total amount≤0.15%,
Balance of Al.
Compared with prior art, beneficial effects of the present invention are：
1. in 7075 alloying component ratio optimizations alloy that the present invention provides, the ratio of all kinds of hardening constituents is it is easy to pass through state
Interior existing aluminium alloy smelting and Casting Equipment are realized；
2. the process of the raising 7075 Aluminum alloy extrusion material performance of the present invention can be by common extrusion production device
Produced in batches, the 7075 alloy extrusion material room temperature tensile being produced according to alloying component proportioning of the present invention and process
, in 600MPa, in 540MPa, elongation after fracture is 12% about, to domestic and international related for yield strength for average strength
Standard is compared, and tensile strength and yield strength improve 50MPa, and elongation after fracture improves 5%.Institution of prescription generally should by industry
It is changed within 120 DEG C × 24 hours 110 DEG C -150 DEG C × 13-16 hour, aging time shortens at least 6 hours, improves production
Efficiency.
Specific embodiment
Below in conjunction with embodiment, embodiment of the present invention is described in detail, but those skilled in the art will
Understand, the following example is merely to illustrate the present invention, and be not construed as limiting the scope of the present invention.Unreceipted concrete in embodiment
Condition person, the condition according to normal condition or manufacturer's suggestion is carried out.Agents useful for same or the unreceipted production firm person of instrument, are
Can be by the commercially available conventional products bought and obtain.
Embodiment 1
Produce the extruding pole that product is diameter 50mm, extrusion ratio is 10.69.
(1) alloy pig heating：7075 alloy extrusion alloy pig heating-up temperatures are 410 DEG C, and alloy pig alloy used becomes bag
Include by weight percentage：
Si：0.35%th, Fe：0.24%th, Cu：1.53%th, Mn：0.21%th, Mg：2.68%th, Cr：0.22%th, Zn：
5.82%th, Ti：0.13%, other individual element≤0.05%, other impurities element total amount≤0.15%, balance of Al.
(2) mould and recipient heating：Extruding mould heating-up temperature is 420 DEG C, and recipient temperature is 410 DEG C.
(3) extrude：Temperature is met the mould requiring and alloy pig loads extruder, adjustment pressure ram speed makes extrusion speed
Spend to control and extruded in 1-3m/min.
(4) solution treatment：Pole after extruding is heated to 465 DEG C ± 3 DEG C be incubated, temperature retention time is 150min.
(5) Quenching Treatment：Bar after insulation is quickly put into and in water, carries out cooling treatment, coolant water temperature controls 25
℃.
(6) stretch：Extruding pole after cooling is carried out 2% stretching on along its length.
(7) artificial aging：Extruding pole after stretching is carried out at timeliness in 115 DEG C of ± 5 DEG C of scope inside holding for 16 hours
Reason.
Embodiment 2
Production product is the flat row of 60*10mm, and extrusion ratio is 15.39.
(1) alloy pig heating：7075 alloy extrusion alloy pig heating-up temperatures are 400 DEG C, and alloy pig alloy used becomes bag
Include by weight percentage：
Si：0.40%th, Fe：0.22%th, Cu：1.98%th, Mn：0.26%th, Mg：2.71%th, Cr：0.25%th, Zn：
5.75%th, Ti：0.16%, other individual element≤0.05%, other impurities element total amount≤0.15%, balance of Al.
(2) mould and recipient heating：Extruding mould heating-up temperature is 460 DEG C, and recipient temperature is 440 DEG C.
(3) extrude：Temperature is met the mould requiring and alloy pig loads extruder, adjustment pressure ram speed makes extrusion speed
Spend to control and extruded in 2-5m/min.
(4) solution treatment：Flat row after extruding is heated to 472 DEG C ± 3 DEG C be incubated, temperature retention time is 30min.
(5) Quenching Treatment：Flat row after insulation is quickly put into and in water, carries out cooling treatment, coolant water temperature controls 30
℃.
(6) stretch：The flat row of extruding after cooling is carried out 2.5% stretching on along its length.
(7) artificial aging：Come flat for the extruding after stretching 145 DEG C of ± 5 DEG C of scope inside holding and carry out at timeliness for 13 hours
Reason.
Embodiment 3
Production product is the flat row of 425*25mm, and extrusion ratio is 28.61.
(1) alloy pig heating：7075 alloy extrusion alloy pig heating-up temperatures are 410 DEG C, and alloy pig alloy used becomes bag
Include by weight percentage：
Si：0.26%th, Fe：0.50%th, Cu：1.84%th, Mn：0.25%th, Mg：2.63%th, Cr：0.22%th, Zn：
5.83%th, Ti：0.11%, other individual element≤0.05%, other impurities element total amount≤0.15%, balance of Al.
(2) mould and recipient heating：Extruding mould heating-up temperature is 430 DEG C, and recipient temperature is 420 DEG C.
(3) extrude：Temperature is met the mould requiring and alloy pig loads extruder, adjustment pressure ram speed makes extrusion speed
Spend to control and extruded in 1-3m/min.
(4) solution treatment：Flat row after extruding is heated to 467 DEG C ± 3 DEG C be incubated, temperature retention time is 120min.
(5) Quenching Treatment：Flat row after insulation is quickly put into and in water, carries out cooling treatment, coolant water temperature controls at 45 DEG C
Left and right.
(6) stretch：The flat row of extruding after cooling is carried out the stretching of 3.5-4.3% on along its length.
(7) artificial aging：Come flat for the extruding after stretching 125 DEG C of ± 5 DEG C of scope inside holding and carry out at timeliness for 15 hours
Reason.
Embodiment 4
Production product is the flat row of 316*22mm, and extrusion ratio is 16.93.
(1) alloy pig heating：7075 alloy extrusion alloy pig heating-up temperatures are 365 DEG C, and alloy pig alloy used becomes bag
Include by weight percentage：
Si：0.35%th, Fe：0.30%th, Cu：1.66%th, Mn：0.21%th, Mg：2.81%th, Cr：0.26%th, Zn：
5.54%th, Ti：0.11%, other individual element≤0.05%, other impurities element total amount≤0.15%, balance of Al.
(2) mould and recipient heating：Extruding mould heating-up temperature is 450 DEG C, and recipient temperature is 430 DEG C.
(3) extrude：Temperature is met the mould requiring and alloy pig loads extruder, adjustment pressure ram speed makes extrusion speed
Spend to control and extruded in 1.5-3.5m/min.
(4) solution treatment：Flat row after extruding is heated to 470 DEG C ± 3 DEG C be incubated, temperature retention time is 100min.
(5) Quenching Treatment：Flat row after insulation is quickly put into and in water, carries out cooling treatment, coolant water temperature controls at 30 DEG C
Left and right.
(6) stretch：The flat row of extruding after cooling is carried out the stretching of 3.5-4.0% on along its length.
(7) artificial aging：Come flat for the extruding after stretching 135 DEG C of ± 5 DEG C of scope inside holding and carry out at timeliness for 14 hours
Reason.
Embodiment 5
Production product is diameter 125mm pole, and extrusion ratio is 13.29.
(1) alloy pig heating：7075 alloy extrusion pole alloy pig heating-up temperatures are 380 DEG C, alloy pig alloy used
Become to include by weight percentage：
Si：0.35%th, Fe：0.30%th, Cu：1.66%th, Mn：0.21%th, Mg：2.81%th, Cr：0.26%th, Zn：
5.54%th, Ti：0.11%, other individual element≤0.05%, other impurities element total amount≤0.15%, balance of Al.
(2) mould and recipient heating：Extruding mould heating-up temperature is 450 DEG C, and recipient temperature is 430 DEG C.
(3) extrude：Temperature is met the mould requiring and alloy pig loads extruder, adjustment pressure ram speed makes extrusion speed
Spend to control and extruded in 1.5-3.5m/min.
(4) solution treatment：Pole after extruding is heated to 465 DEG C ± 3 DEG C be incubated, temperature retention time is 270min.
(5) Quenching Treatment：Pole after insulation is quickly put into and in water, carries out cooling treatment, coolant water temperature controls at 30 DEG C
Left and right.
(6) stretch：Extruding pole after cooling is carried out the stretching of 2.5-3.5% on along its length.
(7) artificial aging：Extruding pole after stretching is carried out at timeliness in 130 DEG C of ± 5 DEG C of scope inside holding for 16 hours
Reason.
Embodiment 6
Producing product is special-shaped solid profile, and rice weighs 12.19, and extrusion ratio is 11.61.
(1) alloy pig heating：7075 alloy extrusion alloy pig heating-up temperatures are 405 DEG C, and alloy pig alloy used becomes bag
Include by weight percentage：
Si：0.36%th, Fe：0.24%th, Cu：1.91%th, Mn：0.25%th, Mg：2.77%th, Cr：0.26%th, Zn：
5.83%th, Ti：0.14%, other individual element≤0.05%, other impurities element total amount≤0.15%, balance of Al.
(2) mould and recipient heating：Extruding mould heating-up temperature is 460 DEG C, and recipient temperature is 435 DEG C.
(3) extrude：Temperature is met the mould requiring and alloy pig loads extruder, adjustment pressure ram speed makes extrusion speed
Spend to control and extruded in 3-5m/min.
(4) solution treatment：Section bar after extruding is heated to 468 DEG C ± 3 DEG C be incubated, temperature retention time is 150min.
(5) Quenching Treatment：Section bar after insulation is quickly put into and in water, carries out cooling treatment, coolant water temperature controls at 33 DEG C
Left and right.
(6) stretch：Extrudate after cooling is carried out the stretching of 3.5-4.5% on along its length.
(7) artificial aging：Extrudate after stretching is carried out timeliness in 13.5 hours in 140 DEG C of ± 5 DEG C of scope inside holding
Process.
Experimental example
In alloying component, Si element can improve the mobility under alloy liquid, can also form a small amount of Mg2Si hardening constituent, but
Its content on the impact of alloy final performance less, controls according to GB/T3190, that is,≤0.40%；Fe can be formed with Si
The thing phase such as AlFeSi, increases extruding difficulty, but in view of the control difficulty of 7075 alloys Fe content in fusion process, by its according to
GB/T3190 controls, and that is,≤0.50%；Cu element is to form Al2Cu and Al2The main alloy element of CuMg hardening constituent it
One, the unsuitable very few otherwise alloy strength of content is low, is controlled in the upper limit for this, i.e. 1.5-2.0%；Mg element is to be formed
MgZn2、Al2CuMg and a small amount of Mg2One of main alloy element of Si hardening constituent, is improve alloy strength, should control in the upper limit,
I.e. 2.5-2.9%；Zn is 7075 alloys main hardening constituent MgZn2The one of the chief elements of phase it is necessary to control in the upper limit, i.e. 5.5-
5.9%；Mn, Cr and Ti element, will according to the upper limit or GB/T3190 composition to controlling coarse grain ring and crystal grain thinning to have positive role
Ask control, i.e. Mn：≤ 0.3%, Cr：0.20-0.28% and Ti≤0.2%.
Room temperature tensile properties test is carried out to the sampling of above example gained finished product, accordingly result is shown in Table 1.
The room temperature tensile properties result of table 1 each embodiment sampling
Can be seen that the 7075 alloy T6 state squeeze woods using technique productions of the present invention from embodiment test data
Room temperature tensile intensity in 600MPa, yield strength in 490MPa, elongation after fracture 12% about, with domestic foreign minister
Pass standard is compared, and tensile strength and yield strength improve 50MPa, and elongation after fracture improves 5%.Meanwhile, in each embodiment when
Effect system was changed to 110 DEG C -150 DEG C × 13-16 hour by 120 DEG C commonly used in industry × 24 hours, and aging time shortens
At least 6 hours, improve production efficiency.
Comparative example 1
In alloying component, Zn, Mg and Cu are to formation MgZn2、Al2Cu and Al2The quantity of CuMg hardening constituent has decisive role,
Directly determine the height of Alloy At Room Temperature tensile property.In this comparative example, except Zn, Mg and Cu content does not meet scope of the present invention
Outward, remaining alloying component is all consistent with described in the embodiment of the present invention 1 with process conditions.
Produce the extruding pole that product is diameter 50mm, extrusion ratio is 10.69.
(1) alloy pig heating：7075 alloy extrusion alloy pig heating-up temperatures are 410 DEG C, and alloy pig alloy used becomes bag
Include by weight percentage：
Si：0.35%th, Fe：0.24%th, Cu：1.25%th, Mn：0.21%th, Mg：2.38%th, Cr：0.22%th, Zn：
5.24%th, Ti：0.13%, other individual element≤0.05%, other impurities element total amount≤0.15%, balance of Al.
(2) mould and recipient heating：Extruding mould heating-up temperature is 420 DEG C, and recipient temperature is 410 DEG C.
(3) extrude：Temperature is met the mould requiring and alloy pig loads extruder, adjustment pressure ram speed makes extrusion speed
Spend to control and extruded in 1-3m/min.
(4) solution treatment：Pole after extruding is heated to 465 DEG C ± 3 DEG C be incubated, temperature retention time is 150min.
(5) Quenching Treatment：Bar after insulation is quickly put into and in water, carries out cooling treatment, coolant water temperature controls 25
℃.
(6) stretch：Extruding pole after cooling is carried out 2% stretching on along its length.
(7) artificial aging：Extruding pole after stretching is carried out at timeliness in 115 DEG C of ± 5 DEG C of scope inside holding for 16 hours
Reason.
Comparative example 2
Solution treatment holding temperature and temperature retention time directly determine the solid solution degree of solute atoms, if exceeding institute of the present invention
State process parameters range, will be unable to ensure solid solution effect, thus reducing Alloy At Room Temperature tensile property, or it is aobvious to directly result in bar
Micro-assembly robot burning is scrapped.In this comparative example, solid solution temperature retention time is shorter than the lower limit of temperature retention time scope of the present invention, alloy
Composition is identical with described in the embodiment of the present invention 2 with remaining process conditions.
Production product is the flat row of 60*10mm, and extrusion ratio is 15.39.
(1) alloy pig heating：7075 alloy extrusion alloy pig heating-up temperatures are 400 DEG C, and alloy pig alloy used becomes bag
Include by weight percentage：
Si：0.31%th, Fe：0.22%th, Cu：1.92%th, Mn：0.26%th, Mg：2.71%th, Cr：0.25%th, Zn：
5.75%th, Ti：0.16%, other individual element≤0.05%, other impurities element total amount≤0.15%, balance of Al.
(2) mould and recipient heating：Extruding mould heating-up temperature is 460 DEG C, and recipient temperature is 440 DEG C.
(3) extrude：Temperature is met the mould requiring and alloy pig loads extruder, adjustment pressure ram speed makes extrusion speed
Spend to control and extruded in 2-5m/min.
(4) solution treatment：Flat row after extruding is heated to 472 DEG C ± 3 DEG C be incubated, temperature retention time is 20min.
(5) Quenching Treatment：Flat row after insulation is quickly put into and in water, carries out cooling treatment, coolant water temperature controls 30
℃.
(6) stretch：The flat row of extruding after cooling is carried out 2.5% stretching on along its length.
(7) artificial aging：Come flat for the extruding after stretching 145 DEG C of ± 5 DEG C of scope inside holding and carry out at timeliness for 13 hours
Reason.
Comparative example 3
Solution treatment holding temperature and temperature retention time directly determine the solid solution degree of solute atoms, if exceeding institute of the present invention
State process parameters range, will be unable to ensure solid solution effect, thus reducing Alloy At Room Temperature tensile property, or it is aobvious to directly result in bar
Micro-assembly robot burning is scrapped.In this comparative example, solid solubility temperature is higher than the higher limit of holding temperature scope of the present invention, alloying component
Identical with described in the embodiment of the present invention 3 with remaining process conditions.
Production product is the flat row of 425*25mm, and extrusion ratio is 28.61.
(1) alloy pig heating：7075 alloy extrusion alloy pig heating-up temperatures are 410 DEG C, and alloy pig alloy used becomes bag
Include by weight percentage：
Si：0.26%th, Fe：0.35%th, Cu：1.84%th, Mn：0.25%th, Mg：2.63%th, Cr：0.22%th, Zn：
5.83%th, Ti：0.11%, other individual element≤0.05%, other impurities element total amount≤0.15%, balance of Al.
(2) mould and recipient heating：Extruding mould heating-up temperature is 430 DEG C, and recipient temperature is 420 DEG C.
(3) extrude：Temperature is met the mould requiring and alloy pig loads extruder, adjustment pressure ram speed makes extrusion speed
Spend to control and extruded in 1-3m/min.
(4) solution treatment：Flat row after extruding is heated to 485 DEG C ± 3 DEG C be incubated, temperature retention time is 120min.
(5) Quenching Treatment：Flat row after insulation is quickly put into and in water, carries out cooling treatment, coolant water temperature controls at 45 DEG C
Left and right.
(6) stretch：The flat row of extruding after cooling is carried out the stretching of 3.5-4.3% on along its length.
(7) artificial aging：Come flat for the extruding after stretching 125 DEG C of ± 5 DEG C of scope inside holding and carry out at timeliness for 15 hours
Reason.
Comparative example 4
Artificial aging is hardening constituent precipitation process, and holding temperature and temperature retention time directly determine the class of precipitation strength phase
Type, quantity, size, thus directly affect the room temperature tensile properties of 7075 alloy extrusion materials.If exceed of the present invention artificial
Effect parameter area, the room temperature tensile properties of squeeze wood will not reach 600MPa/540MPa/12% of the present invention.This comparative example
Middle artificial aging holding temperature is higher than range higher limit of the present invention, and alloying component and remaining process conditions are implemented with the present invention
Identical described in example 4.
Production product is the flat row of 316*22mm, and extrusion ratio is 16.93.
(1) alloy pig heating：7075 alloy extrusion alloy pig heating-up temperatures are 365 DEG C, and alloy pig alloy used becomes bag
Include by weight percentage：
Si：0.35%th, Fe：0.30%th, Cu：1.66%th, Mn：0.21%th, Mg：2.81%th, Cr：0.26%th, Zn：
5.54%th, Ti：0.11%, other individual element≤0.05%, other impurities element total amount≤0.15%, balance of Al.
(2) mould and recipient heating：Extruding mould heating-up temperature is 450 DEG C, and recipient temperature is 430 DEG C.
(3) extrude：Temperature is met the mould requiring and alloy pig loads extruder, adjustment pressure ram speed makes extrusion speed
Spend to control and extruded in 1.5-3.5m/min.
(4) solution treatment：Flat row after extruding is heated to 470 DEG C ± 3 DEG C be incubated, temperature retention time is 100min.
(5) Quenching Treatment：Flat row after insulation is quickly put into and in water, carries out cooling treatment, coolant water temperature controls at 30 DEG C
Left and right.
(6) stretch：The flat row of extruding after cooling is carried out the stretching of 3.5-4.0% on along its length.
(7) artificial aging：Come flat for the extruding after stretching 170 DEG C of ± 5 DEG C of scope inside holding and carry out at timeliness for 14 hours
Reason.
Comparative example 5
Artificial aging is hardening constituent precipitation process, and holding temperature and temperature retention time directly determine the class of precipitation strength phase
Type, quantity, size, thus directly affect the room temperature tensile properties of 7075 alloy extrusion materials.If exceed of the present invention artificial
Effect parameter area, the room temperature tensile properties of squeeze wood will not reach 600MPa/540MPa/12% of the present invention.This comparative example
Middle artificial aging temperature retention time is shorter than lower range limit of the present invention, and alloying component and remaining process conditions are implemented with the present invention
Identical described in example 6.
Producing product is special-shaped solid profile, and rice weighs 12.19, and extrusion ratio is 11.61.
(1) alloy pig heating：7075 alloy extrusion alloy pig heating-up temperatures are 405 DEG C, and alloy pig alloy used becomes bag
Include by weight percentage：
Si：0.36%th, Fe：0.24%th, Cu：1.91%th, Mn：0.25%th, Mg：2.77%th, Cr：0.26%th, Zn：
5.83%th, Ti：0.14%, other individual element≤0.05%, other impurities element total amount≤0.15%, balance of Al.
(2) mould and recipient heating：Extruding mould heating-up temperature is 460 DEG C, and recipient temperature is 435 DEG C.
(3) extrude：Temperature is met the mould requiring and alloy pig loads extruder, adjustment pressure ram speed makes extrusion speed
Spend to control and extruded in 3-5m/min.
(4) solution treatment：Section bar after extruding is heated to 468 DEG C ± 3 DEG C be incubated, temperature retention time is 150min.
(5) Quenching Treatment：Section bar after insulation is quickly put into and in water, carries out cooling treatment, coolant water temperature controls at 33 DEG C
Left and right.
(6) stretch：Extrudate after cooling is carried out the stretching of 3.5-4.5% on along its length.
(7) artificial aging：Extrudate after stretching is carried out at timeliness in 140 DEG C of ± 5 DEG C of scope inside holding for 12 hours
Reason.
The finished product producing gained according to above comparative example process conditions is sampled, and carries out room temperature tensile properties survey
Examination, accordingly result is shown in Table 2.
Can be seen that from the test data of comparative example does not adopt alloying component proportioning of the present invention or technological parameter to produce
The room temperature tensile intensity of T6 state 7075 alloy extrusion material be unable to reach 600MPa, maintain essentially in below 585MPa, surrender is strong
Degree is in 525MPa and following, the 540MPa that technique not up to of the present invention can reach, and the produced product of comparative example 3 draws
Stretch performance and do not meet requirement in GB/T6892 or AMS-QQ-A-200/11.As can be seen here, do not adopt alloying component of the present invention
Proportioning or technological parameter produce T6 state 7075 alloy extrusion material, and not only solid solution and aging strengthening model high energy consumption, time are long, Er Qiesuo
The squeeze wood room temperature tensile properties producing also cannot be significantly improved.
Although illustrate and describing the present invention with specific embodiment, but it will be appreciated that without departing substantially from the present invention's
Many other changes can be made in the case of spirit and scope and change.It is, therefore, intended that in the following claims
Including all such changes and modifications belonging in the scope of the invention.
Claims (10)
1. a kind of process improving 7075 Aluminum alloy extrusion material performances is it is characterised in that concrete technology step is as follows：
1) alloy pig that heating 7075 alloy materials are made；
2) heating mould and recipient；
3) mould after heating and ingot are added and extruded after extruder；
4) solution treatment is carried out to the squeeze wood after extruding；
5) squeeze wood after solution treatment is quenched；
6) squeeze wood after stretching quenching；
7) Ageing Treatment is carried out to the squeeze wood after stretching.
2. method according to claim 1 is it is characterised in that described step 1) in, ingot is heated to 350-410 DEG C.
3. method according to claim 1 is it is characterised in that described step 2) in, mould is heated to 420-460 DEG C,
Preferably, the recipient of extruder is heated to 410-440 DEG C.
4. method according to claim 1 is it is characterised in that described step 3) in extruded velocity be 1m/min-5m/
min.
5. method according to claim 1 is it is characterised in that described step 4) in solution treatment specifically include, will squeeze
Squeeze wood after pressure is heated to 462 DEG C -475 DEG C and is incubated it is preferable that temperature retention time is 30min-270min.
6. method according to claim 1 is it is characterised in that described step 5) in Quenching Treatment, specifically include, will protect
Squeeze wood after temperature is quickly put into and is carried out cooling treatment in water, and coolant water temperature controls below 50 DEG C.
7. method according to claim 1 is it is characterised in that described step 6) in, carry out along squeeze wood length direction
The stretching of 2%-4.5%.
8. method according to claim 1 is it is characterised in that described step 7) in Ageing Treatment include, at stretching
Squeeze wood after reason was in 110 DEG C -150 DEG C scope inside holding 13 hours -16 hours.
9. used in any one methods described in claim 1-8 alloy pig it is characterised in that described alloy include by weight
The following components of amount percentages：
Si：≤ 0.40%, Fe：≤ 0.50%, Cu：1.5-2.0%, Mn：≤ 0.3%, Mg：2.5-2.9%, Cr：0.20-
0.28%th, Zn：5.5-5.9%, Ti：≤ 0.2%, other individual element≤0.05%, other impurities element total amount≤0.15%,
Balance of Al.
10. alloy pig according to claim 9 it is characterised in that described alloy include by weight percentage following
Component：
Si：0.26-0.35%, Fe：0.30-0.35%, Cu：1.6-1.7%, Mn：≤ 0.25%, Mg：2.7-2.8%, Cr：
0.25-0.26%, Zn：5.5-5.6%, Ti：≤ 0.15%, other individual element≤0.05%, other impurities element total amount≤
0.15%, balance of Al.
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