CN109161828A - A kind of processing technology and aluminium alloy extrusions for reducing T5 state aluminium alloy Surface of profile coarse-grain - Google Patents
A kind of processing technology and aluminium alloy extrusions for reducing T5 state aluminium alloy Surface of profile coarse-grain Download PDFInfo
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Abstract
A kind of processing technology and aluminium alloy extrusions for reducing T5 state aluminium alloy Surface of profile coarse-grain, is related to aluminium alloy manufacture field.Processing technology for reducing T5 state aluminium alloy Surface of profile coarse-grain is to form preparation raw material according to the alloying element of 6N01 aluminium alloy, and founding is at casting rod；Casting rod is successively carried out to homogeneous again, strips off the skin, squeeze, press quenching, tension straingtening and twin-stage artificial aging, extruding is using single hole bridge die extrusion, the land length of extrusion die is 4-8mm, the casting rod temperature of extruding is 510-525 DEG C, the processing technology can effectively reduce 6N01 aluminium alloy section surface coarse-grain, and the performance indexes of final product is above standard requirements.The physical properties such as mechanics, the fatigue of the aluminium alloy extrusions of the embodiment of the present invention greatly improve, and bearing capacity, safety in utilization and service life improve.
Description
Technical field
The present invention relates to aluminium alloy manufacture fields, and in particular to a kind of thick for reducing T5 state aluminium alloy Surface of profile
Brilliant processing technology and aluminium alloy extrusions.
Background technique
6N01 aluminium alloy is the preferred material of motor train unit train, is widely used in the car body and structural member of motor train unit train.
6N01 aluminium alloy belongs to the heat-treatable strengthened wrought aluminium alloy of Al-Si-Mg system, can obtain after press quenching, artificial aging
Obtain moderate strength.In 6N01 aluminium alloy extrusions extrusion process, surface often will appear open grain structure, this is Al-alloy products
The important tissue defects of one kind, will cause the physical properties such as material mechanical performance, fatigue strength and be decreased obviously, influence material
Normal use causes application risk.
In order to reduce the generation of aluminium alloy open grain structure in process, has the shape of some pairs of aluminium alloy coarse-grains at present
At the process controlled.But these methods only consider alloy composition or other single factor tests to the shadow of coarse-grain
It rings, does not comprehensively consider influence of the other factors to coarse-grain, and each factor pair in different aluminium alloy extrusions process
The formation of coarse-grain can all generate Different Effects.Therefore, the prior art is ideal not enough to the control effect of aluminium alloy coarse-grain, and
There is presently no a kind of special processes for reducing 6N01 aluminium alloy section surface coarse-grain, to meet 6N01 aluminium alloy extrusions work
For the use demand of motor train unit train material.
Therefore, a kind of process for reducing 6N01 aluminium alloy section surface coarse-grain is explored, the comprehensive performance of profile is improved
It is current urgent problem.
Summary of the invention
The purpose of the present invention is to provide a kind of processing technologys for reducing T5 state aluminium alloy Surface of profile coarse-grain, should
Processing technology can effectively reduce 6N01 aluminium alloy section surface coarse-grain, and the performance indexes of final product is above standard and wants
It asks.
Another object of the present invention is to provide a kind of aluminium alloy extrusions, the physical properties such as mechanics, fatigue are greatly improved, and are held
Loading capability, safety in utilization and service life improve.
The present invention solves its technical problem and adopts the following technical solutions to realize.
The present invention proposes a kind of processing technology for reducing T5 state aluminium alloy Surface of profile coarse-grain comprising following step
It is rapid:
Preparation raw material is formed according to the alloying element of 6N01 aluminium alloy, and founding is at casting rod, by mass percentage, alloy
Element composition includes: Si:0.57%-0.65%, Fe:0.08%-0.12%, Cu:0.10%-0.18%, Mn:0.20%-
0.25%, Mg:0.58%-0.65%, Cr:0.11%-0.17%, Zn:0.10%-0.14%, Ti:0.02%-0.04%,
His individual element≤0.05%, other impurities element add up to≤0.15%, Al: surplus；
Casting rod is successively carried out to homogeneous, strips off the skin, squeeze, press quenching, tension straingtening and twin-stage artificial aging, the extruding
It is using single hole bridge die extrusion, the land length of extrusion die is 4-8mm, and the casting rod temperature of the extruding is 510-525
℃。
Further, in a preferred embodiment of the present invention, by mass percentage, the alloying element composition includes: Si:
0.58%-0.62%, Fe:0.08%-0.10%, Cu:0.14%-0.18%, Mn:0.20%-0.24%, Mg:0.60%-
0.65%, Cr:0.11%-0.15%, Zn:0.10%-0.12%, Ti:0.02%-0.03%, other individual elements≤
0.05%, other impurities element adds up to≤0.15%, Al: surplus.
Further, in a preferred embodiment of the present invention, the homogeneous is that casting rod is heated to 455-465 DEG C, heating speed
Rate is 38-42 DEG C/min, keeps the temperature 16-18 hours, naturally cools to room temperature.
Further, in a preferred embodiment of the present invention, the surface layer processing capacity to strip off the skin is 1-8mm, surface roughness
Ra≤25, the casting rod diameter after stripping off the skin are 584-586mm.
Further, in a preferred embodiment of the present invention, described squeeze is casting rod to be carried out to gradient-heated, then squeezed
Pressure, the heating temperature of the casting rod are 510-525 DEG C, and temperature gradient is 10-20 DEG C, and the heating temperature of the extrusion die is
480-500 DEG C, soaking time 6-12h, the heating temperature of extrusion barrel is 425-455 DEG C, extrusion speed 1.2-2.8m/min, system
Product outlet temperature is 510-540 DEG C, and discard is set as 45-60mm, extrusion ratio 27-32.
Further, in a preferred embodiment of the present invention, the cooling extrusion die of liquid nitrogen is used when squeezing, the liquid nitrogen
Outlet pressure is 0.5-0.6Mpa.
Further, in a preferred embodiment of the present invention, the press quenching is quenched using strong wind cooling, and upper air volume is adjusted to
80%-100%, downdraft are adjusted to 70%-100%, and quenched products temperature is less than 70 DEG C.
Further, in a preferred embodiment of the present invention, the extensibility of the tension straingtening is 0.3%-2.0%.
Further, in a preferred embodiment of the present invention, the first stage aging temp of the twin-stage artificial aging is
130-140 DEG C, 2.5-3.5h is kept the temperature, second stage aging temp is 170-180 DEG C, keeps the temperature 6-7h.
The present invention proposes a kind of aluminium alloy extrusions, is using above-mentioned thick for reducing T5 state aluminium alloy Surface of profile
Brilliant processing technology is made, tensile strength >=290MPa of the aluminium alloy extrusions, yield strength >=265MPa, and elongation >=
13%.
The processing technology and aluminium alloy extrusions for reducing T5 state aluminium alloy Surface of profile coarse-grain of the embodiment of the present invention
Beneficial effect be: the processing technology for reducing T5 state aluminium alloy Surface of profile coarse-grain of the embodiment of the present invention be according to
The alloying element of 6N01 aluminium alloy forms preparation raw material, and founding, at casting rod, by mass percentage, alloying element composition wraps
It includes: Si:0.57%-0.65%, Fe:0.08%-0.12%, Cu:0.10%-0.18%, Mn:0.20%-0.25%, Mg:
0.58%-0.65%, Cr:0.11%-0.17%, Zn:0.10%-0.14%, Ti:0.02%-0.04%, other individual elements
≤ 0.05%, other impurities element adds up to≤0.15%, Al: surplus；Casting rod is successively carried out to homogeneous again, strips off the skin, squeeze, online
Quenching, tension straingtening and twin-stage artificial aging, extruding are using single hole bridge die extrusion, and the land length of extrusion die is 4-
8mm, the casting rod temperature of extruding are 510-525 DEG C, which can effectively reduce 6N01 aluminium alloy section surface coarse-grain, finally
The performance indexes of product is above standard requirements.Mechanics, the fatigue of the aluminium alloy extrusions of the embodiment of the present invention etc. are physical
It can greatly improve, bearing capacity, safety in utilization and service life improve.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is a kind of high power photo for 6N01 aluminium alloy extrusions that the embodiment of the present invention 1 provides；
Fig. 2 is a kind of high power photo for 6N01 aluminium alloy extrusions that comparative example 1 of the present invention provides.
Specific embodiment
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be in the embodiment of the present invention
Technical solution be clearly and completely described.The person that is not specified actual conditions in embodiment, according to normal conditions or manufacturer builds
The condition of view carries out.Reagents or instruments used without specified manufacturer is the conventional production that can be obtained by commercially available purchase
Product.
The processing technology and aluminium for reducing T5 state aluminium alloy Surface of profile coarse-grain of the embodiment of the present invention are closed below
Metal type material is specifically described.
The embodiment of the present invention provides a kind of processing technology for reducing T5 state aluminium alloy Surface of profile coarse-grain comprising
Following steps:
(1) founding is at stick: forming preparation raw material according to the alloying element of 6N01 aluminium alloy, and melting, is cast as casting rod.This
Embodiment optimizes the alloying element composition of 6N01 aluminium alloy, by mass percentage, the alloying element composition after optimization
Include: Si:0.57%-0.65%, Fe:0.08%-0.12%, Cu:0.10%-0.18%, Mn:0.20%-0.25%, Mg:
0.58%-0.65%, Cr:0.11%-0.17%, Zn:0.10%-0.14%, Ti:0.02%-0.04%, other individual elements
≤ 0.05%, other impurities element adds up to≤0.15%, Al: surplus.Alloying element composition after advanced optimizing includes: Si:
0.58%-0.62%, Fe:0.08%-0.10%, Cu:0.14%-0.18%, Mn:0.20%-0.24%, Mg:0.60%-
0.65%, Cr:0.11%-0.15%, Zn:0.10%-0.12%, Ti:0.02%-0.03%, other individual elements≤
0.05%, other impurities element adds up to≤0.15%, Al: surplus.
The present embodiment needs to control Mg in the alloying element composition for optimizing 6N01 aluminium alloy2The content of Si, works as Mg2In Si
There is also a certain amount of surplus Si, superfluous Si to be conducive to the reinforcing of alloy, Mg less than 1.73, in matrix by w (Mg)/w (Si)2Si institute
The ratio accounted for increases, and shear stress increases, and the migration of glissile dislocation is more difficult, is not likely to produce coarse-grain, can increase T5 state profile
Comprehensive performance.
The present embodiment, by controlling Fe, can significantly improve aluminium alloy in the alloying element composition for optimizing 6N01 aluminium alloy
The recrystallization temperature of extruded product.Fe is in 6N01 alloy mainly with AlFeSi, FeAl3Equal compound forms exist, in alloy
In the presence of a small amount of Fe help to refine as-cast grain, but when the content of Fe is more than specified value, profile plasticity is deteriorated, and easily occurs
Corrosion.The present embodiment has carried out strict control, respectively less than 0.12% to the Fe content in the casting rod used.
The present embodiment, by adding Cu, can mitigate the conjunction of 6N01 aluminium in the alloying element composition for optimizing 6N01 aluminium alloy
The Shelf―time effect of metal type material, suitable Cu can reduce natrual ageing speed, thus mitigate the adverse effect of Shelf―time effect, it is same with this
When, a small amount of Cu is solid-solution in α-Al and forms CuAl2Phase, can be fully dissolved in solid solution in solution treatment makes its supersaturation
Degree increases, and can play supplement invigoration effect, so that the mechanical property of profile is protected, exist in addition it can significantly improve alloy
Plasticity when hot-working.The present embodiment controls in 0.14%-0.18% Cu content, and preferable intensity and plasticity can be obtained.
The present embodiment is in the alloying element composition for optimizing 6N01 aluminium alloy, by adding Mn, forms MnAl with metal Al6
Metallic compound, during hot extrusion deformation, macromolecular mass MnAl6The resistance of deformation of aluminum substrate is increased, Mn element plays
One pinning effect, reduces the inhomogeneous deformation degree of 6N01 aluminium alloy.Meanwhile in the homogenization or solid solution of alloy casting rod
In treatment process, MnAl6It is precipitated and is gathered on the crystal boundary of crystal grain with dispersoid particle state, dispersoid particle precipitate is to substructure
Polygonization and stabilisation play a major role, decline nucleus nucleation rate and growth rate all, recrystallization temperature improve, hinder
Crystal grain is grown up and is assembled.In addition, Mn element is to make one of the neutralization element that Fe phase morphology changes in 6N01 alloy,
Also it is usually utilized to be added in alloy the harm for eliminating phase, Mn element generally generates Al with Al, Si chemical combination in the alloy6Mn
And Al0Mn2Si, and these compounds can be used as a kind of dissolution matrix, wherein by the Fe dissolution in alloy, reduce nocuousness to reach
The purpose mutually generated.But excessive Mn is added, the illeffects of β-Fe phase cannot be not only completely eliminated, generates hardness very instead
High cerioid primary α-Fe phase, drops low-alloyed processing performance, while increasing cost.In the present embodiment, controls Mn content and exist
0.20%-0.24% is advisable.
The present embodiment, by adding Cr, reacts in the alloying element composition for optimizing 6N01 aluminium alloy with Al matrix
Generate a large amount of dystectic Al7Cr compound plays the role of heterogeneous forming core during alloy melt solidification, to refine
The as-cast structure of alloy.Supersaturated solid solution is formed in addition, will be dissolved in matrix there are also part, casting rod is then being heat-treated
It is decomposed with supersaturated solid solution occurs in hot procedure, tiny Al is precipitated7The disperse phases such as Cr compound.These disperse phases have
High density and high thermal stability, pinning dislocation and crystal boundary in alloy heat treatment and thermal deformation process, hinder dislocation rearrangement and crystalline substance
Boundary's migration is played the role of inhibiting deformed grains.With the increase of Cr content, the as-cast structure of alloy first reduces to be increased afterwards, when
When Cr content is more than 0.17%, excessive Cr element can significantly reduce the constitutional supercooling degree of melt solidification front liquid phase, increase and close
The crystallization range of golden melt, the effect that the crystal grain recrystallization and recrystal grain for eventually leading to alloy are grown up.
For the present embodiment in the alloying element composition for optimizing 6N01 aluminium alloy, the main function for adding Ti is refinement casting group
It knits, reduces tearing tendency, improve material mechanical performance.Ti forms Al in aluminium base3Ti can generate peritectic reaction with melt, and
As heterogeneous necleus, refining effect is played；In addition make precipitated phase Dispersed precipitate in the alloy, can effectively pinning live crystal boundary and
Dislocation hinders the generation of recrystallization, to improve alloy recrystallization temperature, while also can be improved the intensity of alloy.
For the present embodiment in the alloying element composition for optimizing 6N01 aluminium alloy, Zn is the impurity member in 6N01 alloy casting rod
Element has certain influence to the corrosive nature of alloy and reflecting properties, if constituent content control is improper, extrudate will
The coarse structure surface after similar erosion is washed is formed, products appearance is influenced.
(2) casting rod homogeneous: the aluminium alloy cast rod that founding is obtained is heated to 455-465 DEG C in homogeneous furnace, heating rate
For 38-42 DEG C/min, 16-18 hours are kept the temperature, room temperature is naturally cooled to.
The purpose of casting rod homogenization is to make product obtain uniform tissue and performance, after high-temperature homogenization, as cast condition
Massive bones shape, granular black pointing object are substituted by the dotted and sheet of tiny distribution in sample tissue, as cast condition group
The dissolution of eutectic structure and dendrite coarse on crystal boundary may be implemented into matrix in the most of all back dissolvings of the second phase knitted.The
Two-phase squeezes, after press quenching through subsequent, higher degree of supersaturation is maintained in matrix, major part Mg after artificial aging2Si
It is precipitated in the form of small and dispersed, plays invigoration effect, therefore the mechanical property of its extrudate is preferable, meanwhile, high-temperature homogenization
It may make extrudate lacks to inhibit the particle of recrystallization that fine grain is promoted to generate.
(3) casting rod strips off the skin: be mingled with using flaying machine removal casting rod surface, greasy dirt, surface layer segregation layer the defects of, the table that strips off the skin
Layer processing capacity is 1-8mm, and surface roughness Ra≤25, the casting rod diameter after stripping off the skin is 584-586mm.
(4) it squeezes: extrusion process being carried out to the casting rod after stripping off the skin using single hole bridge die extrusion and obtains profile, single hole shunts
Mould extruding is to make the extruding that is plastically deformed under extruding force effect of solid billet using divergent die on the extruder of single hole
Method, the land length of extrusion die are 4-8mm, and the casting rod temperature of extruding is 510-525 DEG C.
Specifically the aluminium alloy cast rod after stripping off the skin is carried out into gradient-heated in main frequency furnace, then is squeezed on extruder
Pressure, the heating temperature of casting rod are 510-525 DEG C, and temperature gradient is 10-20 DEG C, and the heating temperature of extrusion die is 480-500 DEG C,
Soaking time 6-12h, the heating temperature of extrusion barrel are 425-455 DEG C, extrusion speed 1.2-2.8m/min, product outlet temperature
It is 510-540 DEG C, discard is set as 45-60mm, extrusion ratio 27-32.When squeezing using the cooling extrusion die of liquid nitrogen, it is ensured that
The temperature range that mold temperature is kept constant in extrusion process, the outlet pressure of liquid nitrogen are 0.5-0.6Mpa.
Reasonable mold design has important influence for production squeeze wood.Achieve the purpose that control bar coarse grain ring,
It needs to carry out adjustment appropriate to die working length that rubbing when metal stream passes through work belt can be obviously increased if work belt is too long
It wipes, promotes the generation of recrystallization and growing up for crystal grain, thus increase the thickness of coarse grain ring, after comprehensively considering, the present embodiment control
Land length is 4-8mm.
Another important control of extrusion process is exactly to squeeze temperature and extrusion speed.Squeeze temperature can by casting rod temperature,
Extrusion cylinder temperature and extrusion speed are adjusted, and when extrusion cylinder temperature matches with casting rod heating temperature, can reduce extrusion cylinder
It rubs between casting rod, the inhomogeneous deformation degree of metal is also with reduction, to alleviate the coarse grain ring depth of bar.This reality
It applies example and temperature is squeezed by reasonable set, to realize the purpose of control coarse grain ring.
(5) press quenching: press quenching is carried out to the profile that extruding obtains using strong wind cooling quenching, upper air volume is adjusted to
80%-100%, downdraft are adjusted to 70%-100%, and quenched products temperature is less than 70 DEG C.
(6) tension straingtening: quenched profile is stretched, aligns to obtain product, extensibility is controlled in 0.3%-
2.0%.
(7) twin-stage artificial aging: carrying out artificial aging processing to the resulting product of tension straingtening, and the of twin-stage artificial aging
One stage aging temp is 130-140 DEG C, keeps the temperature 2.5-3.5h, and second stage aging temp is 170-180 DEG C, keeps the temperature 6-7h,
It is cooling after artificial aging, obtain final product.
In two-stage time effect system, first stage ageing treatment mainly makes alloy have stable precipitation at nucleome, the first rank
Section ageing treatment is mainly hardening constituent Mg2Si is fully precipitated out of α (Al) matrix, while the form and size of intergranular precipitated phase
It is occupied well in intergranular, 170-180 DEG C of temperature is also just in timeliness peak region, so product under the two-stage time effect system
Mechanical property highest.
The embodiment of the present invention also provides a kind of aluminium alloy extrusions, is using above-mentioned for reducing T5 state aluminium alloy type
The processing technology of material coarse grains on surface is made.The above-mentioned processing technology for reducing T5 state aluminium alloy Surface of profile coarse-grain can have
Effect reduce 6N01 aluminium alloy section surface coarse-grain, the performance indexes of final product be above standard requirements (standard requirements are as follows:
Tensile strength >=245MPa, yield strength >=230MPa, elongation >=8%), aluminium alloy extrusions made from the embodiment of the present invention
Tensile strength >=290MPa, yield strength >=265MPa, elongation >=13%, compared with common 6N01 aluminium alloy extrusions, substantially
The physical properties such as mechanics, the fatigue of material are improved, the bearing capacity, safety in utilization and service life of material are improved.
Feature and performance of the invention are described in further detail with reference to embodiments.
Embodiment 1
The present embodiment provides a kind of 6N01 aluminium alloy extrusions, it is made according to following processing technology:
Preparation raw material is formed according to the alloying element of 6N01 aluminium alloy, alloying element composition includes: by mass percentage
Si:0.58%, Fe:0.10%, Cu:0.18%, Mn:0.24%, Mg:0.62%, Cr:0.15%, Zn:0.12%, Ti:
0.03%, other individual element≤0.05%, other impurities element adds up to≤0.15%, Al: surplus, and melting, is cast as casting
Stick.
The aluminium alloy cast rod that founding obtains is heated to 460 DEG C in homogeneous furnace, heating rate is 40 DEG C/min, heat preservation 16
Hour, naturally cool to room temperature.
Using flaying machine removal casting rod surface be mingled with, greasy dirt, surface layer segregation layer the defects of, the surface layer processing capacity to strip off the skin is
5mm, surface roughness Ra=10, the casting rod diameter after stripping off the skin are 585mm.
Extrusion process is carried out to the casting rod after stripping off the skin using single hole bridge die extrusion and obtains profile, the work belt of extrusion die
Length is 5mm, the aluminium alloy cast rod after stripping off the skin specifically is carried out gradient-heated in main frequency furnace, then squeezed on extruder
Pressure, the heating temperature of casting rod are 525 DEG C, and temperature gradient is 15 DEG C, and the heating temperature of extrusion die is 500 DEG C, soaking time 8h,
The heating temperature of extrusion barrel is 435 DEG C, when squeezing using the cooling extrusion die of liquid nitrogen, it is ensured that mold temperature is in extrusion process
The temperature range kept constant, the outlet pressure of liquid nitrogen are 0.5-0.6Mpa, extrusion speed 1.6m/min, product outlet temperature
It is 520 DEG C, discard is set as 50mm, extrusion ratio 30.
Press quenching is carried out to the profile that extruding obtains using strong wind cooling quenching, upper air volume is adjusted to 80%, downdraft tune
It is 80%, quenched products temperature is less than 70 DEG C.
Quenched profile is stretched, aligns to obtain product, extensibility is controlled in 0.8%-1.5%.
Artificial aging processing is carried out to the resulting product of tension straingtening, the first stage aging temp of twin-stage artificial aging is
135 DEG C, 3h is kept the temperature, second stage aging temp is 175 DEG C, keeps the temperature 6.5h, it is cooling after artificial aging, obtain final product.
Embodiment 2
The present embodiment provides a kind of 6N01 aluminium alloy extrusions, the step of processing technology in processing technology and embodiment 1
It is essentially identical with parameter, the difference is that, in the present embodiment, the heating temperature of casting rod is 520 DEG C, obtains final product.
Embodiment 3
The present embodiment provides a kind of 6N01 aluminium alloy extrusions, the step of processing technology in processing technology and embodiment 1
It is essentially identical with parameter, the difference is that, in the present embodiment, the heating temperature of casting rod is 510 DEG C, obtains final product.
Embodiment 4
The present embodiment provides a kind of 6N01 aluminium alloy extrusions, the step of processing technology in processing technology and embodiment 1
It is essentially identical with parameter, the difference is that, in the present embodiment, alloying element composition includes: Si by mass percentage:
0.62%, Fe:0.08%, Cu:0.15%, Mn:0.20%, Mg:0.60%, Cr:0.11%, Zn:0.10%, Ti:0.02%,
Other individual element≤0.05%, other impurities element add up to≤0.15%, Al: surplus obtains final product.
Embodiment 5
The present embodiment provides a kind of 6N01 aluminium alloy extrusions, the step of processing technology in processing technology and embodiment 1
It is essentially identical with parameter, the difference is that, in the present embodiment, the land length of extrusion die is 8mm, is finally made
Product.
Comparative example 1
The step of this comparative example provides a kind of 6N01 aluminium alloy extrusions, processing technology in processing technology and embodiment 1
It is essentially identical with parameter, the difference is that, in this comparative example, alloying element composition includes: Si by mass percentage:
0.55%, Fe:0.15%, Cu:0.08%, Mn:0.12%, Mg:0.60%, Cr:0.12%, Zn:0.15%, Ti:0.02%,
Other individual element≤0.05%, other impurities element add up to≤0.15%, Al: surplus.
Comparative example 2
The step of this comparative example provides a kind of 6N01 aluminium alloy extrusions, processing technology in processing technology and embodiment 1
It is essentially identical with parameter, the difference is that, in this comparative example, the casting rod temperature of extruding is 530 DEG C.
Comparative example 3
The step of this comparative example provides a kind of 6N01 aluminium alloy extrusions, processing technology in processing technology and embodiment 1
It is essentially identical with parameter, the difference is that, in this comparative example, the land length of extrusion die is 10mm.
One, it takes pictures respectively to the surface high magnification numbe of the 6N01 aluminium alloy extrusions of embodiment 1 and comparative example 1.Fig. 1 is embodiment
1 6N01 aluminium alloy extrusions high power photo, Fig. 2 are the 6N01 aluminium alloy extrusions high power photo of embodiment 1.
6N01 aluminium alloy type can be effectively reduced in processing technology it can be seen from Fig. 1 and Fig. 2 according to the embodiment of the present invention
Material coarse grains on surface.
Two, detection comparison, the test of mechanical property are carried out to the 6N01 aluminium alloy extrusions of embodiment 1-5 and comparative example 1-3
The results are shown in Table 1.
The mechanical property of 1 6N01 aluminium alloy extrusions of table
| Project | Tensile strength/MPa | Yield strength/MPa | Extensibility/% |
| Embodiment 1 | 295 | 278 | 13 |
| Embodiment 2 | 292 | 272 | 13.5 |
| Embodiment 3 | 290 | 269 | 14 |
| Embodiment 4 | 296 | 275 | 14.2 |
| Embodiment 5 | 294 | 279 | 14.4 |
| Comparative example 1 | 253 | 228 | 9 |
| Comparative example 2 | 255 | 234 | 9 |
| Comparative example 3 | 268 | 241 | 10 |
| Standard value | ≥245 | ≥230 | ≥8 |
It can be seen that the performance of the 6N01 aluminium alloy extrusions obtained according to the processing technology of the embodiment of the present invention by upper table
As follows: tensile strength >=290MPa, yield strength >=265MPa, elongation >=13%, performance indexes are above standard and want
Summation comparative example.
In conclusion the processing technology for reducing T5 state aluminium alloy Surface of profile coarse-grain of the embodiment of the present invention can have
Effect reduces 6N01 aluminium alloy section surface coarse-grain, and the performance indexes of final product is above standard requirements；The present invention is implemented
The physical properties such as mechanics, the fatigue of aluminium alloy extrusions of example greatly improve, and bearing capacity, safety in utilization and service life mention
It is high.
Embodiments described above is a part of the embodiment of the present invention, instead of all the embodiments.Reality of the invention
The detailed description for applying example is not intended to limit the range of claimed invention, but is merely representative of selected implementation of the invention
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
Every other embodiment, shall fall within the protection scope of the present invention.
Claims (10)
1. a kind of processing technology for reducing T5 state aluminium alloy Surface of profile coarse-grain, which is characterized in that it includes following step
It is rapid:
Preparation raw material is formed according to the alloying element of 6N01 aluminium alloy, and founding is at casting rod, by mass percentage, alloying element
Composition includes: Si:0.57%-0.65%, Fe:0.08%-0.12%, Cu:0.10%-0.18%, Mn:0.20%-0.25%,
Mg:0.58%-0.65%, Cr:0.11%-0.17%, Zn:0.10%-0.14%, Ti:0.02%-0.04%, other are single
Element≤0.05%, other impurities element add up to≤0.15%, Al: surplus；
Casting rod is successively carried out to homogeneous, strips off the skin, squeeze, press quenching, tension straingtening and twin-stage artificial aging, the extruding is to adopt
With single hole bridge die extrusion, the land length of extrusion die is 4-8mm, and the casting rod temperature of the extruding is 510-525 DEG C.
2. the processing technology according to claim 1 for reducing T5 state aluminium alloy Surface of profile coarse-grain, feature exist
In by mass percentage, the alloying element composition includes: Si:0.58%-0.62%, Fe:0.08%-0.10%, Cu:
0.14%-0.18%, Mn:0.20%-0.24%, Mg:0.60%-0.65%, Cr:0.11%-0.15%, Zn:0.10%-
0.12%, Ti:0.02%-0.03%, other individual element≤0.05%, other impurities element add up to≤0.15%, Al: remaining
Amount.
3. the processing technology according to claim 1 for reducing T5 state aluminium alloy Surface of profile coarse-grain, feature exist
In the homogeneous is that casting rod is heated to 455-465 DEG C, and heating rate is 38-42 DEG C/min, keeps the temperature 16-18 hours, naturally cold
But to room temperature.
4. the processing technology according to claim 1 for reducing T5 state aluminium alloy Surface of profile coarse-grain, feature exist
In the surface layer processing capacity to strip off the skin is 1-8mm, and surface roughness Ra≤25, the casting rod diameter after stripping off the skin is 584-586mm.
5. the processing technology according to claim 1 for reducing T5 state aluminium alloy Surface of profile coarse-grain, feature exist
In the extruding is casting rod to be carried out to gradient-heated, then squeezed, and the heating temperature of the casting rod is 510-525 DEG C, temperature
Gradient is 10-20 DEG C, and the heating temperature of the extrusion die is 480-500 DEG C, soaking time 6-12h, the heating temperature of extrusion barrel
Degree is 425-455 DEG C, extrusion speed 1.2-2.8m/min, and product outlet temperature is 510-540 DEG C, and discard is set as 45-
60mm, extrusion ratio 27-32.
6. the processing technology according to claim 1 for reducing T5 state aluminium alloy Surface of profile coarse-grain, feature exist
In when squeezing using the cooling extrusion die of liquid nitrogen, the outlet pressure of the liquid nitrogen is 0.5-0.6Mpa.
7. the processing technology according to claim 1 for reducing T5 state aluminium alloy Surface of profile coarse-grain, feature exist
In the press quenching is quenched using strong wind cooling, and upper air volume is adjusted to 80%-100%, and downdraft is adjusted to 70%-100%, quenches
Products temperature after fire is less than 70 DEG C.
8. the processing technology according to claim 1 for reducing T5 state aluminium alloy Surface of profile coarse-grain, feature exist
In the extensibility of the tension straingtening is 0.3%-2.0%.
9. the processing technology according to claim 1 for reducing T5 state aluminium alloy Surface of profile coarse-grain, feature exist
In the first stage aging temp of the twin-stage artificial aging is 130-140 DEG C, keeps the temperature 2.5-3.5h, second stage timeliness temperature
Degree is 170-180 DEG C, keeps the temperature 6-7h.
10. a kind of aluminium alloy extrusions, which is characterized in that its be using as claimed in any one of claims 1-9 wherein for reducing
The processing technology of T5 state aluminium alloy Surface of profile coarse-grain is made, tensile strength >=290MPa of the aluminium alloy extrusions, surrender
Intensity >=265MPa, elongation >=13%.
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| CN110983118A (en) * | 2019-12-25 | 2020-04-10 | 营口忠旺铝业有限公司 | Production process of aluminum alloy section for cylinder |
| CN111014338A (en) * | 2019-12-25 | 2020-04-17 | 辽宁忠旺集团有限公司 | 6063 aluminum alloy section extrusion crystal grain control process |
| CN112496074A (en) * | 2020-11-27 | 2021-03-16 | 辽宁忠旺集团有限公司 | Aluminum alloy bar for vehicle and processing method |
| CN112792149A (en) * | 2020-12-23 | 2021-05-14 | 广东和胜工业铝材股份有限公司 | Extrusion die and extrusion method of aluminum alloy profile |
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| CN110983118A (en) * | 2019-12-25 | 2020-04-10 | 营口忠旺铝业有限公司 | Production process of aluminum alloy section for cylinder |
| CN111014338A (en) * | 2019-12-25 | 2020-04-17 | 辽宁忠旺集团有限公司 | 6063 aluminum alloy section extrusion crystal grain control process |
| CN110983118B (en) * | 2019-12-25 | 2021-02-09 | 营口忠旺铝业有限公司 | Production process of aluminum alloy section for cylinder |
| CN111014338B (en) * | 2019-12-25 | 2021-06-15 | 辽宁忠旺集团有限公司 | 6063 aluminum alloy section extrusion crystal grain control process |
| CN112496074A (en) * | 2020-11-27 | 2021-03-16 | 辽宁忠旺集团有限公司 | Aluminum alloy bar for vehicle and processing method |
| CN112792149A (en) * | 2020-12-23 | 2021-05-14 | 广东和胜工业铝材股份有限公司 | Extrusion die and extrusion method of aluminum alloy profile |
| CN113930699A (en) * | 2021-10-14 | 2022-01-14 | 山东大学 | Processing technology for inhibiting coarse grains of welding seam of magnesium alloy profile |
| US11697868B2 (en) | 2021-10-14 | 2023-07-11 | Shandong University | Processing technology for inhibiting weld coarse grains of magnesium alloy profiles |
| CN114310142A (en) * | 2021-12-10 | 2022-04-12 | 广东坚美铝型材厂（集团）有限公司 | Repairing method of solid plate extrusion die |
| CN114310142B (en) * | 2021-12-10 | 2022-12-16 | 广东坚美铝型材厂（集团）有限公司 | Repairing method of solid plate extrusion die |
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