CN106191572B - A kind of pressure casting method of auto parts machinery aluminium alloy and auto parts machinery - Google Patents

A kind of pressure casting method of auto parts machinery aluminium alloy and auto parts machinery Download PDF

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Publication number
CN106191572B
CN106191572B CN201610521731.XA CN201610521731A CN106191572B CN 106191572 B CN106191572 B CN 106191572B CN 201610521731 A CN201610521731 A CN 201610521731A CN 106191572 B CN106191572 B CN 106191572B
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aluminium alloy
casting
minutes
auto parts
parts machinery
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CN106191572A (en
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徐光明
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Yuyao Hongshun Machinery Co Ltd
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Yuyao Hongshun Machinery Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/06Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08Alloys based on aluminium with magnesium as the next major constituent with silicon
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/002Castings of light metals
    • B22D21/007Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/06Making alloys with the use of special agents for refining or deoxidising
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/047Changing 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 magnesium as the next major constituent

Abstract

The present invention provides a kind of auto parts machinery aluminium alloy, including following component:Mg, Si, B, Ti, Cu, Cr, Zr, Fe, Sn, Co, Sc, Hf, surplus are Al and inevitable impurity.Compared with prior art, Mg, Si, Cu, Cr, Zr element are with the addition of in the aluminium alloy, effectively increase the intensity and toughness of aluminium alloy, and added in aluminium alloy Co, Sc, Hf, Ti, B element, die casting product can be made to produce good crystal grain refinement, effectively overcome casting crack, improve casting of appearance of cast and ingot surface quality.The present invention also provides a kind of pressure casting method of auto parts machinery, using above-mentioned auto parts machinery aluminium alloy.Casting prepared by die casting of the present invention, which avoids, there is the defects of stomata, shrinkage cavity, unclear misrun or appearance profile, and product qualification rate is higher.

Description

A kind of pressure casting method of auto parts machinery aluminium alloy and auto parts machinery
Technical field
The present invention relates to die-casting technique field, more particularly to the die casting side of a kind of auto parts machinery aluminium alloy and auto parts machinery Method.
Background technology
Aluminium alloy is due to higher tensile strength, preferable elongation percentage comprehensive mechanical property, excellent corrosion resistance And the advantages that low cost, used in auto parts machinery production industry extensive.As people are to the continuous of aluminium alloy castings performance requirement Improve, the aluminium alloy castings for how producing function admirable is increasingly taken seriously suitable for auto parts machinery.
The common die-casting technique of aluminium alloy generally use in auto parts machinery is produced at present, and common die-casting technique The auto parts machinery die casting of the aluminium alloy of production, easily stomata be present and cause bad phenomenon in tissue, while again due to aluminium alloy There is the defects of low intensity, mechanical performance are not high, corrosion-resistant, resistance to elevated temperatures is poor in part, therefore, how to find a kind of process meanses The problem of easily depositing stomata in the mechanical performance and tissue of the auto parts machinery of aluminium alloy is improved, troubles the working of Die Casting Industry always Person.
In the prior art, the Chinese patent literature of Application No. 201010542132.9 reports a kind of aluminum-alloy wheel casting Technique and Technology for Heating Processing are made, is comprised the steps:A, using metal pattern low-pressure casting process, pouring temperature is 690-735 DEG C, Mold preheating temperature is 250-350 DEG C;B, refined in smelting furnace, and adjust the content of iron in aluminium liquid, silicon;Wrapped in refining In carry out the outer nitrogen blowing refining of rotten and stove, and adjust the content of magnesium in aluminium liquid, strontium, titanium;C, add at the big position of thickness of wheel cold But pipe carries out rapid cooling, delays the cooling velocity in the middle part of wheel rim in side form periphery filling heat-preservation cotton, to realize consecutive solidification;D, wheel Enter heat treatment kiln after casting cooling, carry out fixation rates.The patent employs the steps such as fusing, cast molding, heat treatment, Effectively solves the problems such as casting oxide inclusion, loose.But the temperature of aluminum alloy melt is not easy accurately to control in fusion process, casting Temperature is too high, casting is produced stomata, shrinkage cavity, or even crackle, while can also shorten the metal life-span, and cast temperature is too low, meeting Make the defects of casting produces cold shut, misrun or appearance profile are unclear.
The content of the invention
It is a primary object of the present invention to provide a kind of auto parts machinery aluminium alloy, there is higher intensity and toughness, nothing Casting crack, surface quality are good;The main object of the present invention, which also resides in, provides a kind of pressure casting method of auto parts machinery, avoids casting There is the defects of stomata, shrinkage cavity, unclear misrun or appearance profile in part, and product qualification rate is higher.
To achieve the above objectives, the technical solution adopted by the present invention is:
The present invention provides a kind of auto parts machinery aluminium alloy, includes the composition of following mass fraction:
Mg:0.5-1.5%;
Si:0.25-0.8%;
B:0.01-0.1%;
Ti:0.1-0.2%;
Cu:0.05-0.25%;
Cr:0.03-0.2%;
Zr:0.04-0.12%;
Fe:< 0.5%;
Sn:0.05-0.4%;
Co:0.01-0.1%;
Sc:0.01-0.15%;
Hf:0.02-0.12%;
Surplus is Al and inevitable impurity.
Preferably, the mass fraction of the Mg is 0.6-1.4%.
Preferably, the mass fraction of the Si is 0.3-0.6%.
Accordingly, the present invention also provides a kind of pressure casting method of auto parts machinery, using the automobile described in above-mentioned technical proposal Accessory aluminium alloy, comprises the following steps:Fine aluminium ingot is heated to 720-780 DEG C and obtains aluminium liquid by step a), insulation, adds silicon Source, magnesium source is added after being cooled to 650-700 DEG C, obtains the first aluminium alloy;First aluminium alloy is warming up to 720- by step b) 750 DEG C, scum silica frost is removed, boron source, titanium source, Tong Yuan, chromium source, zirconium source, tin source, cobalt source, scandium source and hafnium source are added into described first closes In golden liquid, 30-50 minutes are incubated, 800-900 DEG C is then heated to and is refined, gone the removal of impurity after being incubated 20-30 minutes, obtain Second aluminium alloy;Second aluminium alloy is cooled to 600-650 DEG C by step c), degasification slagging-off, is imported after the constituent analysis of stokehold Holding furnace, holding temperature are 850-900 DEG C, are blown into dry high pure nitrogen by the carbon-point in second aluminium alloy described In second aluminium alloy;Step d) matched moulds to mold parting surface has gap, stops matched moulds, oxygen is passed through into the gap, then Continue matched moulds to mould to close;The mould is preheated to 200-250 DEG C by step e), and second aluminium alloy is imported into the mould In tool, and oxygen is injected into the mould, die casting, obtain casting after cooled and solidified;The casting is removed burr removing by step f), It is put into the wire basket of shaft furnace and carries out Quenching Treatment, auto parts machinery is obtained after sandblasting.
Preferably, in step a, soaking time is 20-40 minutes.
Preferably, in step c, the gassing time dry high pure nitrogen being blown into second aluminium alloy is 10-15 Minute.
Preferably, in step d, the pressure of oxygen is 0.3-0.6Mpa, and it is 10-20 minutes to be passed through the oxygen time.
Preferably, in step e, the pressure of oxygen is 0.1-0.25Mpa, and it is 10-20 minutes to be passed through the oxygen time.
Preferably, in step f, the temperature of Quenching Treatment is 450-525 DEG C, and the time of Quenching Treatment is 8-10 hours.
Preferably, in addition to:Casting after Quenching Treatment is put into the water that water temperature is 70-90 DEG C, processing time 10- 20 minutes, after the completion of the casting is put into tempering furnace, carry out Ageing Treatment, the temperature of Ageing Treatment is 180-200 DEG C, when The time of effect processing is 8-10 hours
The present invention provides a kind of auto parts machinery aluminium alloy, including following component:Mg:0.5-1.5%;Si:0.25- 0.8%;
B:0.01-0.1%;Ti:0.1-0.2%;Cu:0.05-0.25%;Cr:0.03-0.2%;Zr:0.04- 0.12%;Fe:< 0.5%;Sn:0.05-0.4%;Co:0.01-0.1%;Sc:0.01-0.15%;Hf:0.02-0.12%; Surplus is Al and inevitable impurity.Compared with prior art, Mg, Si, Cu, Cr, Zr element are with the addition of in the aluminium alloy, Effectively increase the intensity and toughness of aluminium alloy, and added in aluminium alloy Co, Sc, Hf, Ti, B element, can make die casting product produce Raw good crystal grain refinement, effectively overcomes casting crack, improves casting of appearance of cast, improves ingot surface quality.
The present invention also provides a kind of pressure casting method of auto parts machinery, using above-mentioned auto parts machinery aluminium alloy.With existing skill Art is compared, and dry nitrogen is blown into aluminum alloy melt by the present invention by carbon-point, and nitrogen is directly entered in aluminum alloy melt, preferably The gas of aluminum alloy melt is taken away, the gaseous impurity in aluminum alloy melt is removed, reduces the casting produced and the possibility of stomata occur Property.Second, holding furnace can make the temperature of aluminium alloy keep stable, and then the cast temperature of aluminium alloy is kept stable, avoid It is unclear etc. that stomata, shrinkage cavity, misrun or appearance profile occurs in the casting for because cast temperature is too high or too low causing to produce Defect, improve the qualification rate of product.3rd, casting is handled using shaft furnace, ensure that the uniformity of product quality, shaft furnace Time and temperature can be recorded, is easy to manual control and operation, improves operating efficiency;By sandblasting, cast(ing) surface is improved Finish, improve the mechanical performance of cast(ing) surface, improve the fatigue resistance of casting.Therefore, prepared by die casting of the present invention Casting, which avoids, there is the defects of stomata, shrinkage cavity, unclear misrun or appearance profile, and product qualification rate is higher.
Embodiment
Describe to be used to disclose the present invention below so that those skilled in the art can realize the present invention.It is excellent in describing below Embodiment is selected to be only used as illustrating, it may occur to persons skilled in the art that other obvious modifications.
The present invention provides a kind of auto parts machinery aluminium alloy, includes the composition of following mass fraction:
Mg:0.5-1.5%;
Si:0.25-0.8%;
B:0.01-0.1%;
Ti:0.1-0.2%;
Cu:0.05-0.25%;
Cr:0.03-0.2%;
Zr:0.04-0.12%;
Fe:< 0.5%;
Sn:0.05-0.4%;
Co:0.01-0.1%;
Sc:0.01-0.15%;
Hf:0.02-0.12%;
Surplus is Al and inevitable impurity.
Mg improves the intensity of aluminium alloy by solution strengthening, is handled in addition, Mg also has in solution treatment and artificial aging Aid in improving the action effect of the intensity of aluminium alloy by combining to form Mg-Si systems precipitate with Si afterwards.But in Mg contents During less than 0.5%, above-mentioned action effect can not be fully obtained, and if Mg contents can not only make final aluminium more than 1.5% The thermal conductivity of alloy can reduce, and existing Mg is segregated layer (β-Mg phases) with burning (locally melting) occurs, and makes shaping Processability reduces, and is cracked in punch process.Therefore, Mg mass fraction is 0.5-1.5%, more preferably 0.6- 1.4%, more preferably 0.65-1.25%.
Si has to be analysed after the processing of solution strengthening, solution treatment and artificial aging by combining to form Mg-Si systems with Mg Go out thing to improve aluminium alloy.But when Si contents are less than 0.25%, it can not fully obtain the action effect and can cause simultaneously Its elongation percentage has declined.On the other hand, if Si contents are more than 0.8%, thick crystal and precipitate such as Al-Fe-Si Series intermetallic compound or Al-Fe-Mn-Si series intermetallic compounds can be formed, and this thick intermetallic compound is being molded When easily become the starting point of crackle, therefore, Si mass fraction is 0.25-0.8%, more preferably 0.3-0.6%.
Ti and B is by the tissue miniaturization of ingot bar during melt-casting, and the element of ingot bar rupture when effectively preventing casting, Ti can Individually to add, but if by the compound additions of Ti and B, then the miniaturization performance of cast sturcture can be improved, can be significantly improved anti- The performance ruptured when only casting.When Ti and B content is less than lower limit, micronized effect is few, the break-resistance hydraulic performance decline of ingot bar; If greater than higher limit, then electrical conductivity can decline, and can separate out the crystallization of Al-Ti or Ti-B coarse InterMetallic Compound, Damage the processability and formability of aluminium alloy.
Cu have promote after solution strengthening and solution treatment and artificial aging processing the formation of Mg-Si systems precipitate from And improve the action effect of the intensity of aluminum alloy rolling prepared material.And Cu can improve tensile strength, elongation, impact resistance and resistance to Flexural fatigue.But when Cu contents are less than 0.05%, the action effect can not be fully obtained, and if Cu contents exceed 0.25%, then molding processibility reduction, is easily cracked in punch process.Therefore, in the present embodiment, Cu quality Fraction is 0.05-0.25%.
Cr and Zr can suppress the recrystallization of aluminium alloy to improve intensity, while make manufactured auto parts machinery in alumite Outward appearance becomes uniform and good after processing.But when Cr contents are less than 0.03%, it can not fully obtain the action effect.Separately On the one hand, if Cr contents are more than 0.2%, the thick intermetallics such as Al-Mg-Cr series intermetallic compounds are easily generated Thing.On the other hand, if Zr contents are more than 0.12%, the thick intermetallic compounds such as Al3Zr are easily generated.It is this thick Intermetallic compound easily becomes the starting point of crackle in shaping, therefore, if it is thick these in aluminum alloy rolling prepared material to be present Intermetallic compound, then easily cracked in punch process.In addition, quenching sensitive during solution treatment becomes sharp, Intensity decreases after Ageing Treatment.Therefore, in the aluminum alloy rolling prepared material of present embodiment, Cr mass fraction is 0.03- 0.2%, Zr mass fraction are 0.04-0.12%.
Fe can form Al-Fe-Mn series intermetallic compounds, Al-Fe-Si series intermetallic compounds and Al-Fe-Mn-Si systems Intermetallic compound etc., when particularly Fe contents are more than 0.5%, there is these intermetallic compounds to become thick or shape Into the trend of substantial amounts of this intermetallic compound.Thick intermetallic compound easily becomes the starting point of crackle in shaping, If therefore these thick intermetallic compounds be present in aluminium alloy, easily cracked in punch process, therefore, Fe's Mass fraction is less than 0.5%.
Sn captures hole at room temperature, suppresses diffusion at room temperature, has the effect for suppressing Strength Changes at room temperature.Separately During high temperature during external baking application, the hole of capture is released, therefore promote diffusion in turn.If Sn contents are very few, still can not Adequately capture hole and its effect can not be played, and can not be formed it is given to this invention tissue (nano-precipitation).Separately On the one hand, if Sn contents are excessive, Sn is in cyrystal boundary segregation, the reason for easily becoming grain-boundary crack.
Co, Sc, Hf are had the function that the element of crystal grain miniaturization, are strong with crystal boundary is improved in crystal boundary precipitation The element of the effect of degree, if containing at least one of 0.01% the above element, above-mentioned effect effect can be obtained Fruit, it is possible to increase tensile strength, elongation, impact resistance and resist bending fatigue properties.On the other hand, if in Co, Sc, Hf Any content exceedes above-mentioned higher limit respectively, then the compound containing the element becomes thick, deteriorates wire-drawing workability, so There is easily broken string and electrical conductivity declines.
Remainder:Al and inevitable impurity, composition, the i.e. remainder beyond foregoing each composition are Al and not Evitable impurity.As the inevitable impurity in the aluminium alloy of present embodiment, for example, can enumerate Zn, V, Ga, In, Ag, Au, Ni, C, Na, Ca, Bi etc..The mass fraction of these inevitable impurity respectively below 0.03% when, will not hinder The effect of the present invention.
Accordingly, the present invention also provides a kind of pressure casting method of auto parts machinery, using above-mentioned auto parts machinery aluminium alloy, bag Include following steps:Fine aluminium ingot is heated to 720-780 DEG C and obtains aluminium liquid by step a), insulation, silicon source is added into the aluminium liquid, is dropped Temperature obtains the first aluminium alloy to addition magnesium source after 650-700 DEG C;First aluminium alloy is warming up to 720-750 DEG C by step b), Scum silica frost is removed, boron source, titanium source, Tong Yuan, chromium source, zirconium source, tin source, cobalt source, scandium source and hafnium source are added in first aluminium alloy, 30-50 minutes are incubated, 800-900 DEG C is then heated to and is refined, 20-30 minutes is incubated, goes the removal of impurity, obtain the second alloy Liquid;Second aluminium alloy is cooled to 600-650 DEG C by step c), degasification slagging-off, holding furnace is imported after the constituent analysis of stokehold, is protected Temperature is 850-900 DEG C, and dry high pure nitrogen is blown into second alloy by the carbon-point in second aluminium alloy In liquid;Step d) matched moulds to mold parting surface has a gap, stops matched moulds, is passed through oxygen into the gap, then proceedes to close Mould to mould closes;The mould is preheated to 200-250 DEG C by step e), and second aluminium alloy is imported in the mould, And oxygen is injected into mould, die casting, after aluminium alloy cooled and solidified, obtain casting;The casting is removed burr removing by step f), It is put into the wire basket of shaft furnace and carries out Quenching Treatment, auto parts machinery is obtained after sandblasting.
The present invention uses the auto parts machinery aluminium alloy, wherein, it with the addition of Mg, Si, Cu, Cr, Zr in the aluminium alloy Element, effectively increases the intensity and toughness of aluminium alloy, and added in aluminium alloy Co, Sc, Hf, Ti, B element, make die casting Product produce good crystal grain refinement, effectively overcome casting crack, improve casting of appearance of cast, improve ingot surface quality.
Preferably, in step a, soaking time is preferably 20-40 minutes, more preferably 30-40 minutes.
In step c, the gassing time dry high pure nitrogen being blown into second aluminium alloy is 10-15 minutes.This Dry nitrogen is blown into aluminum alloy melt by invention by the carbon-point in the second aluminium alloy, and nitrogen is directly entered aluminum alloy melt In, the gas of aluminum alloy melt can be preferably taken away, the gaseous impurity in aluminum alloy melt is removed, reduces the casting produced and go out The possibility of existing stomata.The holding furnace that the present invention uses can control the temperature of aluminium alloy to keep stable, and then make aluminium alloy Cast temperature keeps stable, and the casting that avoid causes to produce because cast temperature is too high or too low stomata, shrinkage cavity occurs, poured The defects of deficiency or appearance profile are unclear, improve the qualification rate of product.
In step d, the pressure of oxygen is preferably 0.3-0.6Mpa, more preferably 0.45-0.6Mpa, it is excellent to be passed through the oxygen time Elect 10-20 minutes, more preferably 12-20 minutes as.In step e, the pressure of oxygen is preferably 0.1-0.25Mpa, more preferably 0.15-0.25Mpa, it is preferably 10-20 minutes to be passed through the oxygen time, more preferably 15-20 minutes;In step f, Quenching Treatment Temperature is preferably 450-525 DEG C, more preferably 460-500 DEG C, and the time of processing is preferably 8-10 hours.
In step f, the present invention ensure that the uniformity of product quality, shaft furnace can be remembered using shaft furnace processing casting Time and temperature are recorded, is easy to manual control and operation, improves operating efficiency;By sandblasting, the bright and clean of cast(ing) surface is improved Degree, the mechanical performance of cast(ing) surface is improved, improve the fatigue resistance of casting.
Preferably, present invention additionally comprises:Casting after Quenching Treatment is put into the water that water temperature is 70-90 DEG C, Processing time is 10-20 minutes, after the completion of the casting is put into tempering furnace, carry out Ageing Treatment, the temperature of Ageing Treatment Preferably 180-200 DEG C, the time of Ageing Treatment is preferably 8-10 hours.
From above scheme as can be seen that the invention provides the vapour of a kind of auto parts machinery aluminium alloy and the use aluminium alloy The pressure casting method of car accessory, the auto parts machinery have higher intensity and toughness, no casting crack, surface quality with aluminium alloy It is good;The auto parts machinery of die casting of the present invention avoids casting and the defects of stomata, shrinkage cavity, unclear misrun or appearance profile occurs, production Product qualification rate is higher.
For a further understanding of the present invention, technical scheme provided by the invention is carried out specifically with reference to embodiment Bright, protection scope of the present invention is not limited by the following examples.
The raw material that the embodiment of the present invention uses is purchased in market.
Embodiment 1
The aluminium alloy of the present embodiment uses the raw material of following weight proportion:
Mg:0.87%;
Si:0.4%;
B:0.04%;
Ti:0.1%;
Cu:0.08%;
Cr:0.08%;
Zr:0.07%;
Fe:0.4%;
Sn:0.2%;
Co:0.03%;
Sc:0.08%;
Hf:0.07%;
Remainder is made up of Al and inevitable impurity.
The present embodiment also provides a kind of pressure casting method of auto parts machinery, comprises the following steps:
1st, fine aluminium ingot is heated to 760 DEG C of fusings, the aluminium liquid after fusing is incubated 35 minutes;Fine aluminium ingot is set fully to melt, then Silicon fusing is added into aluminium liquid, 700 DEG C is then cooled the temperature to, magnesium is completely forced into aluminium alloy;
2nd, 750 DEG C are warming up to, removes scum silica frost, the component of remaining alloy is added in aluminium alloy, is incubated 45 minutes, then It is warming up to 900 DEG C to be refined, is incubated 30 minutes, goes the removal of impurity.
3rd, the molten mass for obtaining step 2 is cooled to 650 DEG C, is removed the gred using inert gas deaeration, then carries out stokehold composition Analysis, aluminium alloy imported into holding furnace after qualified, temperature maintains 850 DEG C, will be dry high-purity by the carbon-point in aluminium alloy Nitrogen is blown into aluminium alloy, blows afloat the time as 12 minutes, removes the gas in aluminium alloy.
4th, matched moulds, until mold parting surface has a gap, stop matched moulds, be passed through oxygen into above-mentioned gap, be passed through oxygen The gas time is 12 minutes, then proceedes to matched moulds, and until mould closes completely, oxygen is the oxygen that pressure is 0.45Mpa, is passed through oxygen The gas time is 12 minutes.
5th, mould is preheated to 225 DEG C, aluminium alloy is imported in mould, and oxygen is injected into mould, pressed afterwards Casting, after aluminium alloy cooled and solidified, mould is opened, remove casting, oxygen is the oxygen that pressure is 0.15Mpa, when being passed through oxygen Between be 15 minutes.
6th, the flash of casting is removed, casting is repaired neatly, then puts it into the wire basket of shaft furnace, is quenched Processing, Quenching Treatment temperature are 500 DEG C, and the Quenching Treatment time is 8 hours, then the casting is put into water, and water temperature is 80 DEG C, Processing time be 20 minutes, after the completion of the casting is put into tempering furnace, carry out Ageing Treatment, aging temperature 200 DEG C, aging time is 10 hours.
7th, casting is put into sand-blasting machine, sandblasting 24 minutes, obtains auto parts machinery.
Embodiment 2
The aluminium alloy of the present embodiment uses the raw material of following weight proportion:
Mg:1.2%;
Si:0.45%;
B:0.1%;
Ti:0.2%;
Cu:0.05%;
Cr:0.04%;
Zr:0.04%;
Fe:0.1%;
Sn:0.2%;
Co:0.07%;
Sc:0.08%;
Hf:0.02%;
Remainder is made up of Al and then inevitable impurity.
The present embodiment also provides a kind of pressure casting method of auto parts machinery, comprises the following steps:
1st, fine aluminium ingot is heated to 740 DEG C of fusings, the aluminium liquid after fusing is incubated 40 minutes;Fine aluminium ingot is set fully to melt, then Silicon fusing is added into aluminium liquid, 650 DEG C is then cooled the temperature to, magnesium is completely forced into aluminium alloy;
2nd, 720 DEG C are warming up to, removes scum silica frost, the component of remaining alloy is added in aluminium alloy, is incubated 50 minutes, then It is warming up to 850 DEG C to be refined, is incubated 20 minutes, goes the removal of impurity.
3rd, the molten mass for obtaining step 2 is cooled to 650 DEG C, is removed the gred using inert gas deaeration, then carries out stokehold composition Analysis, aluminium alloy imported into holding furnace after qualified, temperature maintains 880 DEG C, will be dry high-purity by the carbon-point in aluminium alloy Nitrogen is blown into aluminium alloy, blows afloat the time as 12 minutes, removes the gas in aluminium alloy.
4th, matched moulds, until mold parting surface has a gap, stop matched moulds, be passed through oxygen into above-mentioned gap, be passed through oxygen The gas time is 12 minutes, then proceedes to matched moulds, and until mould closes completely, oxygen is the oxygen that pressure is 0.55Mpa, is passed through oxygen The gas time is 10 minutes.
5th, mould is preheated to 220 DEG C, aluminium alloy is imported in mould, and oxygen is injected into mould, pressed afterwards Casting, after aluminium alloy cooled and solidified, mould is opened, remove casting, oxygen is the oxygen that pressure is 0.12Mpa, when being passed through oxygen Between be 20 minutes.
6th, the flash of casting is removed, casting is repaired neatly, then puts it into the wire basket of shaft furnace, is quenched Processing, Quenching Treatment temperature are 440 DEG C, and the Quenching Treatment time is 9 hours, then the casting is put into water, and water temperature is 90 DEG C, Processing time be 20 minutes, after the completion of the casting is put into tempering furnace, carry out Ageing Treatment, aging temperature 180 DEG C, aging time is 10 hours.
7th, casting is put into sand-blasting machine, sandblasting 25 minutes, obtains auto parts machinery.
Embodiment 3
The aluminium alloy of the present embodiment uses the raw material of following weight proportion:
Mg:0.8%;
Si:0.5%;
B:0.05%;
Ti:0.12%;
Cu:0.15%;
Cr:0.1%;
Zr:0.1%;
Fe:0.1%;
Sn:0.4%;
Co:0.1%;
Sc:0.01%;
Hf:0.04%;
Remainder is made up of Al and then inevitable impurity.
The present embodiment also provides a kind of pressure casting method of auto parts machinery, comprises the following steps:
1st, fine aluminium ingot is heated to 750 DEG C of fusings, the aluminium liquid after fusing is incubated 35 minutes;Fine aluminium ingot is set fully to melt, then Silicon fusing is added into aluminium liquid, 680 DEG C is then cooled the temperature to, magnesium is completely forced into aluminium alloy;
2nd, heat up 725 DEG C, remove scum silica frost, the component of remaining alloy is added in aluminium alloy, be incubated 45 minutes, then rise Warm to 880 DEG C are refined, and are incubated 25 minutes, are gone the removal of impurity.
3rd, the molten mass for obtaining step 2 is cooled to 625 DEG C, is removed the gred using inert gas deaeration, then carries out stokehold composition Analysis, aluminium alloy imported into holding furnace after qualified, temperature maintains 880 DEG C, will be dry high-purity by the carbon-point in aluminium alloy Nitrogen is blown into aluminium alloy, blows afloat the time as 12 minutes, removes the gas in aluminium alloy.
4th, matched moulds, until mold parting surface has a gap, stop matched moulds, be passed through oxygen into above-mentioned gap, be passed through oxygen The gas time is 12 minutes, then proceedes to matched moulds, and until mould closes completely, oxygen is the oxygen that pressure is 0.45Mpa, is passed through oxygen The gas time is 13 minutes.
5th, mould is preheated to 225 DEG C, aluminium alloy is imported in mould, and oxygen is injected into mould, pressed afterwards Casting, after aluminium alloy cooled and solidified, mould is opened, remove casting, oxygen is the oxygen that pressure is 0.2Mpa, is passed through the oxygen time For 10-20 minutes.
6th, the flash of casting is removed, casting is repaired neatly, then puts it into the wire basket of shaft furnace, is quenched Processing, Quenching Treatment temperature are 500 DEG C, and the Quenching Treatment time is 9 hours, then the casting is put into water, and water temperature is 80 DEG C, Processing time be 12 minutes, after the completion of the casting is put into tempering furnace, carry out Ageing Treatment, aging temperature 200 DEG C, aging time is 9 hours.
7th, casting is put into sand-blasting machine, sandblasting 23 minutes, obtains auto parts machinery.
The performance of 1-3 of the embodiment of the present invention auto parts machineries prepared is detected respectively, as a result as shown in table 1.
The results of property of auto parts machinery prepared by the 1-3 of the embodiment of the present invention of table 1
Project Tensile strength (Mpa) Elongation percentage (%) Brinell hardness (HB)
Embodiment 1 480 8 125
Embodiment 2 493 9.2 120
Embodiment 3 475 8.5 122
General principle, principal character and the advantages of the present invention of the present invention has been shown and described above.The technology of the industry For personnel it should be appreciated that the present invention is not limited to the above embodiments, that described in above-described embodiment and specification is the present invention Principle, various changes and modifications of the present invention are possible without departing from the spirit and scope of the present invention, these change and Improvement is both fallen within the range of claimed invention.The protection domain of application claims by appended claims and its Equivalent defines.

Claims (3)

1. a kind of auto parts machinery aluminium alloy, it is characterised in that be made up of the composition of following mass fraction:
Mg:0.6-1.4%;
Si:0.3-0.6%;
B:0.04-0.1%;
Ti:0.1-0.2%;
Cu:0.05-0.25%;
Cr:0.03-0.2%;
Zr:0.04-0.12%;
Fe:< 0.5%;
Sn:0.05-0.4%;
Co:0.01-0.1%;
Sc:0.01-0.15%;
Hf:0.02-0.12%;
Surplus is Al and inevitable impurity.
A kind of 2. pressure casting method of auto parts machinery, it is characterised in that using the auto parts machinery aluminium alloy described in claim 1, Comprise the following steps:
Fine aluminium ingot is heated to 720-780 DEG C and obtains aluminium liquid by step a), insulation, is added silicon source, is added after being cooled to 650-700 DEG C Magnesium source, obtains the first aluminium alloy, and soaking time is 20-40 minutes;
First aluminium alloy is warming up to 720-750 DEG C by step b), scum silica frost is removed, by boron source, titanium source, Tong Yuan, chromium source, zirconium Source, tin source, cobalt source, scandium source and hafnium source are added in first aluminium alloy, are incubated 30-50 minutes, are then heated to 800-900 DEG C Refined, go the removal of impurity after being incubated 20-30 minutes, obtain the second aluminium alloy;
Second aluminium alloy is cooled to 600-650 DEG C by step c), degasification slagging-off, holding furnace is imported after the constituent analysis of stokehold, Holding temperature is 850-900 DEG C, and dry high pure nitrogen is blown into described second by the carbon-point in second aluminium alloy closes In golden liquid, the gassing time dry high pure nitrogen being blown into second aluminium alloy is 10-15 minutes;
Step d) matched moulds to mold parting surface has gap, stops matched moulds, is passed through oxygen into the gap, then proceedes to matched moulds extremely Mould closes, and the pressure of oxygen is 0.3-0.6MPa, and it is 10-20 minutes to be passed through the oxygen time;
The mould is preheated to 200-250 DEG C by step e), and second aluminium alloy is imported in the mould, and to the mould Injection oxygen in tool, die casting, obtains casting after cooled and solidified, and the pressure of oxygen is 0.1-0.25MPa, is passed through the oxygen time and is 10-20 minutes;
The casting is removed burr removing by step f), is put into the wire basket of shaft furnace and is carried out Quenching Treatment, automobile is obtained after sandblasting Accessory, the temperature of Quenching Treatment is 450-525 DEG C, and the time of Quenching Treatment is 8-10 hours.
3. pressure casting method according to claim 2, it is characterised in that also include:
It is that processing time is 10-20 minutes in 70-90 DEG C of water that casting after Quenching Treatment is put into water temperature, after the completion of by institute State casting to be put into tempering furnace, carry out Ageing Treatment, the temperature of Ageing Treatment is 180-200 DEG C, and the time of Ageing Treatment is 8- 10 hours.
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