CN108165849A - A kind of 7 line aluminium alloys and preparation method thereof - Google Patents
A kind of 7 line aluminium alloys and preparation method thereof Download PDFInfo
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- CN108165849A CN108165849A CN201711296915.1A CN201711296915A CN108165849A CN 108165849 A CN108165849 A CN 108165849A CN 201711296915 A CN201711296915 A CN 201711296915A CN 108165849 A CN108165849 A CN 108165849A
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
- C22C21/10—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
- C22F1/04—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
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Abstract
The present invention relates to a kind of 7 line aluminium alloys, are made of the component of following weight percentage：1.15 1.6% magnesium, 0.01 0.021% titanium, 5.8 7.0% zinc, 0.2 0.4% bronze medal, 0.005 0.01% cerium, 0.002 0.008% antimony, the manganese not higher than 0.003%, the silicon not higher than 0.006%, the iron not higher than 0.08%, the chromium not higher than 0.003% and the zirconium not higher than 0.01%, surplus are aluminium.The invention further relates to a kind of preparation methods of 7 line aluminium alloy.7 line aluminium alloys of the present invention have the advantages that the glossiness after the mechanical property for significantly improving 7 line aluminium alloys and product anodic oxidation.
Description
Technical field
The present invention relates to aluminium alloy technology, feature is related to a kind of 7 line aluminium alloys and preparation method thereof.
Background technology
Aluminium alloy adds in alloying elements by fine aluminium and is made, and the Al-Mn that manganese element is developed is added such as in fine aluminium
Alloy adds copper in fine aluminium and develops made of Al-Cu alloy, in fine aluminium while adds copper and magnesium elements develop Al-Cu-
Mg systems duralumin, hard alumin ium alloy, adding zinc, magnesium, copper develops Al-Zn-Mg-Cu 7 series extra super duralumin alloys etc. simultaneously in fine aluminium.Aluminium closes
The characteristics of golden is light, intensity height, good heat dissipation, good hand touch and easy anode oxidation coloration.Under same intensity requirement, aluminium alloy
Parts can be made thinner and light than plastics, while can also meet the Highgrade integration of 3C Product, lightening, micromation, resist
Fall the requirement for hitting electromagnetic shielding and heat dissipation.The information technoloy equipments such as mobile phone, tablet computer, laptop on the market use now
Aluminium alloy is commonly 6 line aluminium alloys, with the development of science and technology 6 traditional wrought aluminium alloys have been difficult to meet in terms of intensity
The requirement of high-end product is especially bent in resistance to deformation, and in terms of the indexs such as anti-drop deformation, 6 be that wrought aluminium alloy and 7 deformation aluminium close
Metallographic is poor away from larger.Consumer's idea constantly changes and starts to pursue 7 line aluminium alloys.It is aluminium that 7 line aluminium alloys, which possess 6,
The characteristics of alloy, and intensity is higher than 6 line aluminium alloys.
In the prior art, although having there is more 7 line aluminium alloy product, have compared with the better mechanics of 6 line aluminium alloys
Performance, still, in order to meet the higher market demand, after mechanical property and the alloy anode oxidation of existing 7 line aluminium alloy
Glossiness improves there is still a need for further.
Invention content
The technical problems to be solved by the invention are：A kind of mechanical property that can further improve alloy and alloy sun are provided
7 line aluminium alloys of glossiness after the oxidation of pole and preparation method thereof.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
A kind of 7 line aluminium alloys, are made of the component of following weight percentage：1.15-1.6% magnesium, 0.01-0.021% titaniums,
5.8-7.0% zinc, 0.2-0.4% copper, the cerium of 0.005-0.01%, the antimony of 0.002-0.008%, the manganese not higher than 0.003%,
Silicon not higher than 0.006%, the iron not higher than 0.08%, the chromium not higher than 0.003% and the zirconium not higher than 0.01%, surplus are
Aluminium.
A kind of preparation method of 7 line aluminium alloy carries out dispensing according to the component composition of 7 above-mentioned line aluminium alloys, melts successively
Change, skim, alloying, casting, homogenization and sawing operation, obtain 7 line aluminium alloy, the temperature of the casting operation is more than
Or equal to 695-705 DEG C, the content of hydrogen is controlled to be no more than 0.12ml/100gAl during casting operation；The homogenization practice
Holding temperature for 498-502 DEG C, soaking time 508-512min.
The beneficial effects of the present invention are：
(1) 7 line aluminium alloys of the invention, on the basis of the component proportion of existing 7 line aluminium alloy, appropriate height-regulating
Magnesium, copper, Zn content proportioning, the frictional resistance that increase dislocation motion in parent metal is dissolved in using Mg, Zn, Cu element improve it
Resistance of deformation, alloying element are added in fine aluminium, form aluminium base solid solution, lattice is caused to be distorted, and increase dislocation motion
Resistance improves alloy strength, and the limit of solubility of Mg, Zn, Cu are all higher, and Mg, Zn, Cu increase, solute atoms concentration, phase
Size is increased, differs bigger with the valence electron number of aluminium atom, invigoration effect is bigger；Discovery based on above-mentioned principle and refer to
It leading, the present invention can significantly improve its alloy mechanical property by above-mentioned magnesium, copper, Zn content proportion design, after tested, hardness energy
Enough reach more than 150HV, more than tensile strength 430MPa, more than yield strength 400MPa, more than 15% elongation percentage, grain size
Between 80-100um；In addition, the rare earth of micro richness cerium can improve the tensile strength and corrosion resistance of alloy, be conducive to improve sun
Pole aoxidizes glossiness；Antimony then can make tissue evenly with crystal grain thinning, and be conducive to the colouring of material anode and high glaze.
(2) 7 line aluminium alloys of the invention, using the adjustment of Cu contents, change its second phase character, subgrain size,
Defect concentrations in crystals and recrystallization temperature, the Al-Cu-Zn-Mg compounds of formation so that alloy material corrosion resistance is more preferable,
Gloss is uniform after anodic oxidation；Its anode effect color is brighter, and Al-Cu-Zn-Mg form alloy system in similary anodic oxygen
It is faint in color under chemical industry skill, is greyish white；Based on above-mentioned, the adjustment of the invention by above-mentioned Cu contents, have so that alloy anode oxygen
The high technique effect of glossiness after change, and by the comparison of metallograph, 7 line aluminium alloys of the invention are after alloy anode oxidation
Precipitated phase metallograph in without apparent material line, compared with the apparent strip flaw of existing 7 line aluminium alloy, have the glossiness high
The advantages of.
Description of the drawings
Fig. 1 is the fractograph of precipitated phase of existing 7 line aluminium alloy after alloy anode oxidation；
Fig. 2 is the fractograph of precipitated phase of 7 line aluminium alloys of the present invention after alloy anode oxidation.
Specific embodiment
For the technology contents that the present invention will be described in detail, the objects and the effects, below in conjunction with embodiment and coordinate attached
Figure is explained.
The design of most critical of the present invention is：Add in micro cerium-rich rare earth, and be turned up in raw material components magnesium, copper,
Zn content matches, and then improves the glossiness after the mechanical property of 7 line aluminium alloys and product anodic oxidation.
Fig. 1 and Fig. 2 is please referred to, a kind of 7 line aluminium alloys are made of the component of following weight percentage：1.15-1.6%
Magnesium, 0.01-0.021% titaniums, 5.8-7.0% zinc, 0.2-0.4% copper, the cerium of 0.005-0.01%, 0.002-0.008% antimony,
Manganese not higher than 0.003%, the silicon not higher than 0.006%, the iron not higher than 0.08%, the chromium not higher than 0.003% and not high
In 0.01% zirconium, surplus is aluminium.
A kind of preparation method of 7 line aluminium alloy carries out dispensing according to the component composition of 7 above-mentioned line aluminium alloys, melts successively
Change, skim, alloying, casting, homogenization and sawing operation, obtain 7 line aluminium alloy, the temperature of the casting operation is more than
Or equal to 695-705 DEG C, the content of hydrogen is controlled to be no more than 0.12ml/100gAl during casting operation；The homogenization practice
Holding temperature for 498-502 DEG C, soaking time 508-512min.
As can be seen from the above description, the beneficial effects of the present invention are：
(1) 7 line aluminium alloys of the invention, on the basis of the component proportion of existing 7 line aluminium alloy, appropriate height-regulating
Magnesium, copper, Zn content proportioning, the frictional resistance that increase dislocation motion in parent metal is dissolved in using Mg, Zn, Cu element improve it
Resistance of deformation, alloying element are added in fine aluminium, form aluminium base solid solution, lattice is caused to be distorted, and increase dislocation motion
Resistance improves alloy strength, and the limit of solubility of Mg, Zn, Cu are all higher, and Mg, Zn, Cu increase, solute atoms concentration, phase
Size is increased, differs bigger with the valence electron number of aluminium atom, invigoration effect is bigger；Discovery based on above-mentioned principle and refer to
It leading, the present invention can significantly improve its alloy mechanical property by above-mentioned magnesium, copper, Zn content proportion design, after tested, hardness energy
Enough reach more than 150HV, more than tensile strength 430MPa, more than yield strength 400MPa, more than 15% elongation percentage, grain size
Between 80-100um；In addition, the rare earth of micro richness cerium can improve the tensile strength and corrosion resistance of alloy, be conducive to improve sun
Pole aoxidizes glossiness；Antimony then can make tissue evenly with crystal grain thinning, and be conducive to the colouring of material anode and high glaze.
(2) 7 line aluminium alloys of the invention, using the adjustment of Cu contents, change its second phase character, subgrain size,
Defect concentrations in crystals and recrystallization temperature, the Al-Cu-Zn-Mg compounds of formation so that alloy material corrosion resistance is more preferable,
Gloss is uniform after anodic oxidation；Its anode effect color is brighter, and Al-Cu-Zn-Mg form alloy system in similary anodic oxygen
It is faint in color under chemical industry skill, is greyish white；Based on above-mentioned, the adjustment of the invention by above-mentioned Cu contents, have so that alloy anode oxygen
The high technique effect of glossiness after change, and by the comparison of metallograph, 7 line aluminium alloys of the invention are after alloy anode oxidation
Precipitated phase metallograph in without apparent material line, compared with the apparent strip flaw of existing 7 line aluminium alloy, have the glossiness high
The advantages of.
In 7 line aluminium alloys of the present invention,
Further, the content of the magnesium is 1.24-1.26%, and the content of zinc is 6.65-6.69%, and the content of copper is
0.28-0.30%.
Further, the content of the magnesium is 1.24-1.25%, and the content of zinc is 6.66-6.68%, and the content of copper is
0.29-0.30%.
Further, the content of the total impurities element of 7 line aluminium alloy is less than 0.15%, the list of 7 line aluminium alloy
The content of a impurity element is not higher than 0.05%.
Seen from the above description, the content of above-mentioned magnesium, zinc, copper can be further controlled, to optimize the mechanical property of 7 line aluminium alloys
Glossiness after energy and product anodic oxidation.
In the preparation method of 7 line aluminium alloys of the present invention,
Further, the temperature in hot junction is not higher than 715 DEG C in the casting operation.
Further, the homogenization practice includes at least once air-cooled and water-cooled process at least once, the wind
Cool time is 88-92 DEG C, and the water cooling time is 30-50min.
Further, the starting cast speed in the casting operation is 65-93mm/min, and speed during casting is 78-
108mm/min, water 130-220T/h.
Further, the slag operation of taking off is：Material after fusing is warming up to 730-750 DEG C, then using argon gas into
Row refining, stands 12-18min, then removes the gred after refining.
Further, the temperature of the alloying operation is 730-750 DEG C, and material forms melt after alloying operates,
It is first 740 ± 5 DEG C by the control of the temperature of the melt of acquisition, then carries out casting operation again.
Fig. 1-2 is please referred to, the embodiment of the present invention one is：
The preparation method of 7 line aluminium alloys of the present embodiment, includes the following steps：
(1) preparation of raw material components：1.15% magnesium, 0.01% titanium, 5.8% zinc, 0.2-0.4% copper, 0.005% cerium,
0.002% antimony, the silicon not higher than 0.006%, the iron not higher than 0.08%, is not higher than the manganese not higher than 0.003%
0.003% chromium and the zirconium not higher than 0.01%, surplus are aluminium.The content of the total impurities element of 7 line aluminium alloy is
0.10%, the content of the single impurity element of 7 line aluminium alloy is 0.05%.
(2) according to the component of 7 line aluminium alloys composition carry out successively dispensing, melt, skim, alloying, casting,
It homogenizes and sawing operation, obtains 7 line aluminium alloy, the temperature of the casting operation is 695 DEG C, is controlled during casting operation
The content of hydrogen is 0.12ml/100gAl；The holding temperature of the homogenization practice is 498 DEG C, soaking time 508min.It is described
The temperature in hot junction is 715 DEG C in casting operation.The homogenization practice includes at least once air-cooled and water cooling at least once
Processing, the air-cooled time are 88 DEG C, and the water cooling time is 30min.Starting cast speed in the casting operation is
65mm/min, speed during casting are 78mm/min, water 130T/h.The slag operation of taking off is：By the material liter after fusing
Then temperature is refined to 730 DEG C using argon gas, 12min is stood after refining, is then removed the gred.The alloying operation
Temperature is 730 DEG C, and material forms melt after alloying operates, and is first 735 DEG C by the control of the temperature of the melt of acquisition, Ran Houzai
Carry out casting operation.
Fig. 1-2 is please referred to, the embodiment of the present invention two is：
The preparation method of 7 line aluminium alloys of the present embodiment, includes the following steps：
(1) preparation of raw material components：7 line aluminium alloy is made of the component of following weight percentage：1.6% magnesium,
0.021% titanium, 0.4% bronze medal, 0.01% cerium, 0.008% antimony, the manganese not higher than 0.003%, is not higher than 7.0% zinc
0.006% silicon, the iron not higher than 0.08%, the chromium not higher than 0.003% and the zirconium not higher than 0.01%, surplus are aluminium.Institute
The content for stating the total impurities element of 7 line aluminium alloys is 0.09%, and the content of the single impurity element of 7 line aluminium alloy is
0.03%.
(2) according to the component of 7 line aluminium alloys composition carry out successively dispensing, melt, skim, alloying, casting,
It homogenizes and sawing operation, obtains 7 line aluminium alloy, the temperature of the casting operation is 699 DEG C, is controlled during casting operation
The content of hydrogen is 0.10ml/100gAl；The holding temperature of the homogenization practice is 502 DEG C, soaking time 512min.It is described
The temperature in hot junction is 710 DEG C in casting operation.The homogenization practice includes at least once air-cooled and water cooling at least once
Processing, the air-cooled time are 92 DEG C, and the water cooling time is 50min.Starting cast speed in the casting operation is
93mm/min, speed during casting are 108mm/min, water 220T/h.The slag operation of taking off is：By the material liter after fusing
Then temperature is refined to 750 DEG C using argon gas, 18min is stood after refining, is then removed the gred.The alloying operation
Temperature is 750 DEG C, and material forms melt after alloying operates, and is first 745 DEG C by the control of the temperature of the melt of acquisition, Ran Houzai
Carry out casting operation.
Fig. 1-2 is please referred to, the embodiment of the present invention three is：
The preparation method of 7 line aluminium alloys of the present embodiment, includes the following steps：
(1) preparation of raw material components：7 line aluminium alloy is made of the component of following weight percentage：1.4% magnesium,
0.08% titanium, 0.3% bronze medal, 0.007% cerium, 0.006% antimony, the manganese not higher than 0.003%, is not higher than 6.0% zinc
0.006% silicon, the iron not higher than 0.08%, the chromium not higher than 0.003% and the zirconium not higher than 0.01%, surplus are aluminium.Institute
The content for stating the total impurities element of 7 line aluminium alloys is 0.12%, and the content of the single impurity element of 7 line aluminium alloy is
0.04%.
(2) according to the component of 7 line aluminium alloys composition carry out successively dispensing, melt, skim, alloying, casting,
It homogenizes and sawing operation, obtains 7 line aluminium alloy, the temperature of the casting operation is 705 DEG C, is controlled during casting operation
The content of hydrogen is 0.11ml/100gAl；The holding temperature of the homogenization practice is 500 DEG C, soaking time 510min.It is described
The temperature in hot junction is 715 DEG C in casting operation.The homogenization practice includes at least once air-cooled and water cooling at least once
Processing, the air-cooled time are 90 DEG C, and the water cooling time is 40min.Starting cast speed in the casting operation is
80mm/min, speed during casting are 88mm/min, water 180T/h.The slag operation of taking off is：By the material liter after fusing
Then temperature is refined to 740 DEG C using argon gas, 16min is stood after refining, is then removed the gred.The alloying operation
Temperature is 740 DEG C, and material forms melt after alloying operates, and is first 740 DEG C by the control of the temperature of the melt of acquisition, Ran Houzai
Carry out casting operation.
Fig. 1-2 is please referred to, the embodiment of the present invention four is：
The concrete component composition of the preparation method of 7 line aluminium alloys of the present embodiment, only 7 line aluminium alloys is different, other with
Embodiment one, embodiment two or embodiment three are identical.The concrete component of 7 line aluminium alloys of the present embodiment forms：Only " the magnesium
Content for 1.24%, the content of zinc is 6.65%, and the content of copper is 0.28%." it is different, other with embodiment one, implement
Example two or embodiment three are identical.
Fig. 1-2 is please referred to, the embodiment of the present invention five is：
The concrete component composition of the preparation method of 7 line aluminium alloys of the present embodiment, only 7 line aluminium alloys is different, other with
Embodiment one, embodiment two or embodiment three are identical.The concrete component of 7 line aluminium alloys of the present embodiment forms：Only " the magnesium
Content for 1.26%, the content of zinc is 6.69%, and the content of copper is 0.30%." it is different, other with embodiment one, implement
Example two or embodiment three are identical.
Fig. 1-2 is please referred to, the embodiment of the present invention six is：
The concrete component composition of the preparation method of 7 line aluminium alloys of the present embodiment, only 7 line aluminium alloys is different, other with
Embodiment one, embodiment two or embodiment three are identical.The concrete component of 7 line aluminium alloys of the present embodiment forms：Only " the magnesium
Content for 1.25%, the content of zinc is 6.68%, and the content of copper is 0.29%." it is different, other with embodiment one, implement
Example two or embodiment three are identical.
Fig. 1-2 is please referred to, the embodiment of the present invention seven is：
The concrete component composition of the preparation method of 7 line aluminium alloys of the present embodiment, only 7 line aluminium alloys is different, other with
Embodiment one, embodiment two or embodiment three are identical.The concrete component of 7 line aluminium alloys of the present embodiment forms：Only " the magnesium
Content for 1.24%, the content of zinc is 6.66%, and the content of copper is 0.29%." it is different, other with embodiment one, implement
Example two or embodiment three are identical.
Fig. 1-2 is please referred to, the embodiment of the present invention eight is：
The concrete component composition of the preparation method of 7 line aluminium alloys of the present embodiment, only 7 line aluminium alloys is different, other with
Embodiment one, embodiment two or embodiment three are identical.The concrete component of 7 line aluminium alloys of the present embodiment forms：Only " the magnesium
Content for 1.25%, the content of zinc is 6.68%, and the content of copper is 0.30%." it is different, other with embodiment one, implement
Example two or embodiment three are identical.
Fig. 1-2 is please referred to, the embodiment of the present invention nine is：
The concrete component composition of the preparation method of 7 line aluminium alloys of the present embodiment, only 7 line aluminium alloys is different, other with
Embodiment one, embodiment two or embodiment three are identical.The concrete component of 7 line aluminium alloys of the present embodiment forms：Only " the magnesium
Content for 1.245%, the content of zinc is 6.67%, and the content of copper is 0.295%." it is different, other with embodiment one, real
It applies example two or embodiment three is identical.
The present invention is in terms of raw material selection, the high-purity remelting aluminium ingot of aluminum feedstock selection, and in high-purity remelting aluminium ingot, iron silicon contains
It measures and is：Fe<0.08；Si<0.06；Cu<0.03；Special impurities content is：It is single<0.005, it amounts to<0.05.Magnesium raw material selects magnesium
Ingot, Mg contents are in magnesium ingot：Magnesium >=99.90% (meets GB/T 3499-2011)；Zinc raw material selects alusil alloy, alusil alloy
Middle Zn content is：Zinc >=99.95% (meets GB/T12689-2004)；Copper raw material selects aluminium copper, and copper contains in aluminium copper
It measures and is：Copper 28-30%；Aluminium titanium boron is as raw material simultaneously, and in aluminium titanium boron, specifications and models are：Al-5Ti-1B (meets YS/
T282-2000), manufacturing firm can be：It is more than nova casting grade, KBM, KBA, LSM；Aluminium foundry returns is as former simultaneously
Expect, in aluminium foundry returns, quality requirement is：It surface should cleaning：Without dirt, without oil stain, no moisture, without surface-treated layer and other
The sundries of quality is influenced, alloy designations are identified clearly, without batch mixing；The standard instance of aluminium foundry returns is：Same alloy production process
In cutting head cutting tail and release block, casting rod waste material, squeeze cutting head cutting tail, deep processing waste material, disapprove addition in aluminium foundry returns
Aluminium skimmings, aluminium ash reclaimed materials, 3000 be contour manganese waste material, 4000 be contour scrap silicon and other iron content, gallium, vanadium food ingredient
Waste material.
In alloying operation, carry out adding waste material and high-purity aluminium ingot, zincification successively and skim, in skimming, treat material melting
Afterwards, temperature reaches 730-750 DEG C, stands 15 minutes after being refined for the first time with argon gas, then removes the gred；After skimming, melt temperature is controlled
It carries out adding magnesium ingot, zinc ingot metal under conditions of 730-750 DEG C of degree (being not higher than 750 DEG C), electromagnetic agitation is opened 30 minutes after adding magnesium ingot；So
After be sampled, when sampling, will sample at 1/2 of melt depth at the left, center, right of smelting furnace burner hearth 1/3, totally 3.Sampling
After carry out feed supplement, i.e.,：Magnesium or silicon are added, feed supplement of the additive amount less than 50Kg can be added in chute；If other feed supplements are more than
Being placed in charging frame for 50Kg is added, and according to 740-750 DEG C of control, stirred 20 minutes after feed supplement to take feed supplement temperature again
Sample.Then holding furnace and converter are checked, is toasted in advance specifically, emptying molten aluminum and residue, holding furnace in holding furnace before converter, is turned
Stove feed supplement simultaneously.It is handled followed by furnace refining, the time is 25 minutes, then leads to argon gas and refine for the second time, refining
It is thorough, it is impossible to stay dead angle, refining pipe will reach melt bottom.It after refining, is stirred, then stands, time of repose
Control was at 20~30 minutes.Then carry out casting preceding sampling, during sampling will at the left, center, right of holding furnace burner hearth 1/3 melt depth
1/2 at sample, totally 3.If unqualified to finely tune need to re-start from furnace refining processing step.Open melt temperature before casting
740 DEG C of control, error are no more than 5 DEG C.
It in casting operation, first carries out casting preceding preparation, prepares to include before casting：The preparation of convective tank：Degasification leading portion uses bone
Powder is protected, and degasification back segment is protected using boron nitride, and degasification back segment chute application dust catcher was cleared up, noresidue, free from flaw, is kept
It is dry；Insulation furnace outlet places glass fiber filter bag；Preparation to depassing unit：Vacuum state is normal, temperature is normal, rotor work
Make within 150 hours service life；To casting the preparation of disk：Casting disk should preheat, and be cleared up using dust catcher, noresidue, free from flaw,
Without coming off and uniformly sprayed boron nitride；Casting each crystallizer of disk should detect qualification in advance, between pinboard and graphite crystallization ring
Groove should be mended with graphite in advance；Preparation to titanium boron wire drawing-in device：It checks whether wire feeder is normal, opens chute planted agent before casting
Put 5 circle titanium boron wires in advance；Preparation to plate-type filtering：Rose Box should be preheating to temperature in use, and babinet planted agent cleans out, filter plate
It should be without short circuit；Preparation to tubular filter：If the first stove is cast, Rose Box and screen pipe are toasted in advance, is not first
Stove casting tubular filter will be kept the temperature, and guncotton is relied to block up head piece employment；Preparation to each weif orifice：Each weif orifice should block peace
Entirely, casting machine is placed around enough emergent plugging, stifled pricker and fiber cotton plate, spare releasing case；Preparation to casting machine：Casting
Platform contraposition is made, opens cooling water；And prepare to set technological parameter, the specific design of the technological parameter is referring to table 1.Table 1
Technological parameter list for casting operation.
Table 1
| Specification mm | Casting speed mm/min | Water T/h | Load time s | Starting velocity mm/min |
| 178 | 108 | 180‐220 | 16 | 93 |
| 203 | 96 | 158‐186 | 18 | 78 |
| 254 | 78 | 130‐150 | 22 | 65 |
It is cast after preparing before casting, manufacturing platform hot-side temperature must not be less than 690 DEG C in entire casting process, hot junction
715 DEG C must not be higher than；And control degasification, i.e.,：Using the SIR equipment of normal work, hydrogen content is controlled and is no more than in maximum
0.12ml/100g Al.Holding furnace must not open stirring in casting process, must not Human disturbance chute, distribution plate liquid flowing shape
State, it is impossible to drag for slag, a pair of of melt is controlled.
Casting round-off work is carried out after above-mentioned casting, controls remaining molten aluminum, i.e.,：Rose Box, chute molten aluminum are released
And mark is carried out, molten aluminum is then released if not production same alloy is continued in stove.
In homogenization practice, preparation is first carried out, that is, by long ingot soaking, soaking after first sawing uses material rack special
It feeds；Check that soaking pit burner, fire door, natural gas are normal.Check that soaking trolley travelling is normal；Confirm soaking rack without broken
Damage, soaking aluminium pad is without tilting.Confirm soaking rack center at pendulum material platform center.Then the casting of targeted design different size
Ingot pendulum material quantity, uniform heating process and cooling technique.Ingot casting pendulum material quantity, uniform heating process and the cooling technique of different size are referring to table
2.Ingot casting pendulum material quantity, uniform heating process and cooling technique list of the table 2 for different size.
Table 2
Then discharging is extremely after ingot casting label " verification/cold heat " printed words are taken in every stove ingot casting soaking hot-zone and cold-zone
Soaking lot number is stamped in soaking zone every ingot casting end with letter punch, then prints and pastes ingot casting Quick Response Code.Finished product ingot casting
End should be marked with alloy designations, the two-dimension code label of " homogeneous ", red symbol pen label.
In sawing operation, first, prepare before carrying out sawing, it is ensured that sawing machine equipment normal operation adjusts billet for sawing and determines
Ruler is, it is specified that scale ± 6mm (short ingot ± 3mm)；According to billet heat for sawing and trade mark adjustment steel seal number；And cropping is set to be more than
500mm, back-end crop are more than 200mm.
Then it tests, examines the checked operation for including Surface Quality and scale, i.e.,：Surface requirements：Surface (including
End face and circumference) it should clean, is smooth, forbid to any end face and circumferential surface polishing, surface defect caused by no casting and operation are drawn
The scar risen, no iron mold, burr, scratch, burn into greasy dirt, dust and other foreign substances；Aluminium bar length direction maximum deflection
Degree/amount of deflection should be less than 1.5mm/m；Sawing end face squareness：90.0°+/‐0.5°；It surface should cleaning：Without dirt, without oil stain, nothing
Moisture, the sundries without surface-treated layer and other influence quality, alloy designations mark is clear, scale meets regulation.Inspection is also wrapped
The checked operation to inherent quality is included, i.e.,：Low power：Isometric, uniform fine grained texture, and lacked without Feather-like Crystal, crackle, stomata etc.
It falls into.Segregation layer will reach the requirement of client；The sawing length at aluminium ingot both ends it is ensured that cracking of the aluminium bar without inside and out or its
It is harmful to the defects of aluminium bar quality, and without it is loose, crack, be mingled with (oxide, boride etc.) and other foreign substances.Inspection
The checked operation further included to coupongs is tested, i.e.,：Batch 2 of alloy slices of production must be taken respectively from cold end on casting platform and
Two ingot castings in hot junction, and be intended to be taken from the lower end of ingot casting, and close to the position for amputating end.For the 4 of first batch of sample
Piece slice should be taken respectively from two ingot castings in cold end and hot junction on casting platform, and the upper and lower end of ingot casting is intended to sample, and to connect
It is bordering on the position for amputating end.Inspection further includes the checked operation that sample presentation does high power, i.e.,：Drilling through high power print send laboratory to do gold
Phase is examined and determine crystal grain and is mingled with.
Then it is identified, mark will clearly (having certain width of nick), in the station location marker for slightly deviateing aluminium bar center.
Font height should be not less than 6.0mm.Label should be removed easily, cannot there are glue or remaining marks on aluminium bar when removing label
Label.And label should be attached on strapping, it is impossible to be placed directly against on aluminium bar.
It is finally stored, neat safety is put in guarantee, and 7 line aluminium alloys prepared are in billet, and billet is not hanging, no
More than 10 layers.
Measure of merit
1st, the hardness of 7 line aluminium alloys that obtains embodiment one to embodiment nine, tensile strength, yield strength, elongation percentage
It is tested respectively with grain size.Specific test method may be selected in the prior art to the hardness tensile strength of aluminium alloy,
The common testing methods of yield strength, elongation percentage and grain size.
The result shows that the hardness of 7 line aluminium alloys that embodiment one to embodiment nine obtains is more than 150HV, tension is strong
Degree is more than 430Mpa, and yield strength is more than 400MPa, and elongation percentage is more than 15% and grain size size is 80-100 μm.
2nd, 7 line aluminium alloys that embodiment one to embodiment nine obtains are subjected to anodic oxidation effect test respectively.
Specifically, using the product of 7 line aluminium alloys as anode, it is placed in the electrolyte such as sulfuric acid, applies anode voltage and carry out
Electrolysis.And the glossiness after 7 line aluminium alloy anodic oxidations is tested and recorded, and measures its precipitation after oxidation respectively
Phase fractograph.The fractograph of precipitated phase of wherein existing 7 line aluminium alloy after alloy anode oxidation be shown in shown in Fig. 1,
The fractograph of precipitated phase of 7 line aluminium alloys of the present invention after alloy anode oxidation is shown in shown in Fig. 2.
The result shows that in Fig. 1, precipitated phase of existing 7 line aluminium alloy after alloy anode oxidation shows apparent striped
Defect, in Fig. 2, the precipitated phase of 7 line aluminium alloys of the invention after alloy anode oxidation is then without apparent material line.Meanwhile it measures
The glossiness of 7 line aluminium alloys of the present invention can reach more than 100.
In conclusion 7 line aluminium alloy provided by the invention has the mechanical property for significantly improving 7 line aluminium alloys and product sun
Pole oxidation after glossiness the advantages of.
The foregoing is merely the embodiment of the present invention, are not intended to limit the scope of the invention, every to utilize this hair
The equivalents that bright specification and accompanying drawing content are made directly or indirectly are used in relevant technical field, similarly include
In the scope of patent protection of the present invention.
Claims (10)
1. a kind of 7 line aluminium alloys, which is characterized in that be made of the component of following weight percentage：1.15-1.6% magnesium, 0.01-
0.021% titanium, 5.8-7.0% zinc, 0.2-0.4% copper, the cerium of 0.005-0.01%, 0.002-0.008% antimony, be not higher than
It 0.003% manganese, the silicon not higher than 0.006%, the iron not higher than 0.08%, the chromium not higher than 0.003% and is not higher than
0.01% zirconium, surplus are aluminium.
2. 7 line aluminium alloy according to claim 1, which is characterized in that the content of the magnesium is 1.24-1.26%, zinc
Content is 6.65-6.69%, and the content of copper is 0.28-0.30%.
3. 7 line aluminium alloy according to claim 1, which is characterized in that the content of the magnesium is 1.24-1.25%, zinc
Content is 6.66-6.68%, and the content of copper is 0.29-0.30%.
4. 7 line aluminium alloy according to claim 1, which is characterized in that the content of the total impurities element of 7 line aluminium alloy
Less than 0.15%, the content of the single impurity element of 7 line aluminium alloy is not higher than 0.05%.
5. a kind of preparation method of 7 line aluminium alloy, which is characterized in that according to 7 described in claim 1-4 any one be aluminium close
The component composition of gold carry out successively dispensing, melt, skim, alloying, casting, homogenization and sawing operation, it is aluminium to obtain described 7
Alloy, the temperature of the casting operation are greater than or equal to 695-705 DEG C, the content of hydrogen are controlled to be no more than during casting operation
0.12ml/100gAl；The holding temperature of the homogenization practice is 498-502 DEG C, soaking time 508-512min.
6. the preparation method of 7 line aluminium alloy according to claim 5, which is characterized in that hot junction in the casting operation
Temperature is not higher than 715 DEG C.
7. the preparation method of 7 line aluminium alloy according to claim 5, which is characterized in that the homogenization practice is included extremely
Few primary air-cooled and water-cooled process at least once, the air-cooled time is 88-92 DEG C, and the water cooling time is 30-
50min。
8. the preparation method of 7 line aluminium alloy according to claim 5, which is characterized in that the starting in the casting operation
Casting speed is 65-93mm/min, and speed during casting is 78-108mm/min, water 130-220T/h.
9. the preparation method of 7 line aluminium alloy according to claim 5, which is characterized in that the slag operation of taking off is：It will fusing
Material afterwards is warming up to 730-750 DEG C, is then refined using argon gas, and 12-18min is stood after refining, is then removed the gred.
10. the preparation method of 7 line aluminium alloy according to claim 5, which is characterized in that the temperature of the alloying operation
It it is 730-750 DEG C, material forms melt after alloying operates, and is first 740 ± 5 DEG C by the control of the temperature of the melt of acquisition, so
Carry out casting operation again afterwards.
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| CN109295363A (en) * | 2018-12-14 | 2019-02-01 | 四川福蓉科技股份公司 | 7 line aluminium alloys of one kind and preparation method thereof |
| CN109470060A (en) * | 2018-12-20 | 2019-03-15 | 四川福蓉科技股份公司 | A kind of protective plate for alloy molten solution diversion trench |
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