CN108165839A - A kind of preparation method of automobile engine aluminum alloy die casting - Google Patents

A kind of preparation method of automobile engine aluminum alloy die casting Download PDF

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Publication number
CN108165839A
CN108165839A CN201711233806.5A CN201711233806A CN108165839A CN 108165839 A CN108165839 A CN 108165839A CN 201711233806 A CN201711233806 A CN 201711233806A CN 108165839 A CN108165839 A CN 108165839A
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China
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degrees celsius
die casting
temperature
alloy
aluminium
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陈刚
束荣辉
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Jiangsu Huasheng Electric Technology Co Ltd
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Jiangsu Huasheng Electric Technology Co Ltd
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Priority to CN201711233806.5A priority Critical patent/CN108165839A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/026Alloys based on aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/03Making alloys by melting using master alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/02Alloys based on aluminium with silicon as the next major constituent
    • 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
    • C22F1/043Changing 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 silicon as the next major constituent

Abstract

The invention discloses a kind of preparation methods of automobile engine aluminum alloy die casting, belong to automobile engine die casting field, more particularly, to a kind of preparation method of automobile engine aluminum alloy die casting.The method of the present invention includes following steps:Dispensing prepares master alloy ingot, master alloy re melting process, die casting, heat treatment, quenching treatment, temper.Stock utilization is high in the processing technology of the preparation method of the automobile engine aluminum alloy die casting of the present invention, it is lost small, production cost is low, and processing technology is simple, atmosphere pollution and environmental hazard are small, meet environmental requirement, intensity, case hardness and the dimensional accuracy of automobile engine die casting obtained are high, and surface roughness is low.

Description

A kind of preparation method of automobile engine aluminum alloy die casting
Technical field
The present invention relates to automobile engine die casting field, more particularly, to a kind of automobile engine aluminum alloy die casting Preparation method.
Background technology
Heart of the engine as automobile, the traveling for automobile provide power.Briefly engine is exactly an energy Switching mechanism, basic principle are by the thermal energy of gasoline (diesel oil), by blanket gas in-cylinder combustion gas expansion, pushing and living Plug acting, is changed into mechanical energy.The history that engine has been passed by more than 100 years along with automobile, no matter design, manufacture, Technique or performance and control aspect all improve a lot, but its basic principle is still constant, in science and technology continues to develop, if Meter engineer constantly combines newest science and technology with engine together, and engine is become electromechanical integrated product, constantly improve The performance of engine.
The automobile engine important parts that die casting is that a load is serious and structure is sufficiently complex, are engines Important composition component, performance have engine important influence.Engine needs to have preferable intensity, resistance to die casting The performances such as heat should also have good casting process and preferable rigidity.General aluminium alloy automobile starts in the prior art The problems such as machine is low with die casting generally existing intensity, and case hardness is low, and dimensional accuracy is low.
Invention content
Problem to be solved by this invention is, it is middle for the above-mentioned prior art the shortcomings that, propose innovation scheme, especially one Kind can effectively solve the problem that general aluminium alloy automobile engine die casting generally existing intensity is low in the prior art, case hardness It is low, the scheme for the problems such as dimensional accuracy is low.
To solve the above problems, the scheme that the present invention uses is as follows:A kind of system of automobile engine aluminum alloy die casting Preparation Method, which is characterized in that the aluminium alloy includes silicon Si6.5-8.5%, copper Cu 1-3%, iron Fe by weight percentage 0.5-0.6%, magnesium Mg 0.1-0.25%, manganese Mn0.17-0.53%, zinc Zn0.8-1.65%, erbium Er < 0.015%, thulium Tm < 0.004%, lutetium Lu < 0.015%, nickel < 0.06%, lead Pb < 0.05%, tin Sn < 0.05%, mercury Hg1/30 (zinc Zn0.8-1.65%), M 1.1-2.25% surpluses are aluminium, and wherein M is described to be one or more in titanium Ti, zirconium Zr and hafnium Hf Preparation method includes the following steps:
1) dispensing:Each raw material of the mass percent purity not less than 99% is weighed according to the composition expressions of alloy Dispensing;
2) master alloy ingot is prepared:Induction melting furnace or arc-melting furnace are preheated under 300 degrees celsius, preheats 30-60 Minute;The copper that step 1) is prepared, iron, 1/2 magnesium, manganese, erbium, thulium, lutetium, nickel, lead, tin, aluminium are added to induction melting furnace or electric arc In smelting furnace, and 750 degrees Celsius are heated to, add in monocrystalline silicon particle, and stir after raw material all fusing, keep the temperature 1-2 hours;Mercury and zinc powder are mixed and heated to 430 degrees Celsius, is allowed to melt and be sufficiently stirred, then keeps the temperature 1-2 hours;So Mercury zinc mixed molten liquid is added in induction melting furnace or arc-melting furnace and is sufficiently stirred afterwards;Above-mentioned alloy molten process all exists It is carried out under vacuum condition;Then covering refining deslagging agent, releases vacuum condition, and it is Celsius in 2 hours temperature to be reduced to 300 Degree, then skims;It adds 1/2 magnesium and is heated to 710 degrees Celsius, vacuumize and stir evenly, and keep the temperature 30 minutes;Release vacuum shape State is skimmed;Then alloy molten solution is poured to having been warmed up into 330 degrees Celsius of crucible, forms master alloy ingot, and 500 It anneals 5 hours under degrees celsius;
3) master alloy re melting process:Master alloy ingot is put into induction melting furnace or arc-melting furnace, it will in 40 minutes Temperature is heated to 800 degrees Celsius of remeltings, adds in M and stirs evenly, be then cooled to 550 degrees Celsius, keeps the temperature 7-10 hours so that Cu atoms form the orderly atom phase cluster of even dispersion distribution with M atoms in heat treatment process in alloy, avoid the formation of The acicular crystal of FeAl3, manganese atom forms MnAl6 compounds with aluminium atom can effectively reduce the harm of iron tramp, simultaneously MnAl6 compounds form dispersoid particle in heat treatment process, improve recrystallization temperature, refine recrystal grain, and prevention is tied again Jingjing grain length is big;550 degrees Celsius of temperature is kept, and it is for use to cover refining deslagging agent;
4) die casting:Temperature is promoted afterwards to 730 degrees Celsius in step 3), is removed the gred, is then cooled to 630-660 degrees Celsius of preparation Mold is preheated to 120-150 degrees Celsius by die casting, and 10-15 microns of releasing agent is then sprayed into mold, continues to heat mold Then temperature steadily inputs aluminium alloy to 300-320 degrees Celsius into mold, aluminium alloy input time is less than 5 seconds, and quickly adds Solidification and crystallization is pressed, is pressurized to 110-150MPa, keeps pressure 30 seconds, die cast;
5) it is heat-treated:The die casting that step 4) obtains is heat-treated using pure hydrogen and purity oxygen burning, at 2 hours It is interior that temperature is promoted to 510 degrees Celsius, and keep the temperature 3-5 hours;
6) quenching treatment:Isolation sealing is carried out to the die casting through Overheating Treatment using pure hydrogen and then is cooled down in a water bath To 400 degrees Celsius, quenching treatment is then carried out in 30 degrees Celsius of warm water;
7) temper:Die casting Jing Guo quenching treatment is put into tempering furnace and is heated to 150 degrees Celsius, and is kept the temperature 20-30 minutes;
8) finished product:Obtained automobile engine aluminum alloy die casting.
Further, according to above-mentioned designing scheme automobile engine aluminum alloy die casting preparation method, feature It is, the M is titanium Ti and zirconium Zr, and titanium Ti is 1.3 times of zirconium Zr.
Further, according to above-mentioned designing scheme automobile engine aluminum alloy die casting preparation method, feature It is, the M is titanium Ti, zirconium Zr and hafnium Hf, and titanium Ti:Zirconium Zr:Hafnium Hf is 3:2:1.
Silicon (Si) is the main ingredient for improving mobile performance.Best mobility can be obtained from eutectic to hypereutectic.But The silicon (Si) that crystallization is precipitated easily forms hard spot, and machinability is made to be deteriorated, so general do not allow it more than eutectic point.In addition, silicon (Si) intensity when can improve tensile strength, hardness, machinability and high temperature, and reduce elongation percentage.Be dissolved in aluminium alloy into Copper (Cu), mechanical performance can improve, and machinability improves.But, corrosion resistance reduces, and slight crack between heat easily occurs.As impurity Copper (Cu) be also in this way.The corrosion resistance of almag is best, therefore ADC5, ADC6 are corrosion resistant alloys, its freezing range Very big, so there is red brittleness, casting is also easy to produce crackle, it is difficult to cast.As the magnesium (Mg) of impurity, in this materials of AL-Cu-Si In, Mg2Si can make casting become fragile, so general standard is within 0.3%.The iron (Fe) of impurity can generate the needle-shaped knot of FeAl3 Crystalline substance, since die casting is chilling, so the crystal being precipitated is very thin, it cannot be said that be oxious component.Content is not easy to take off less than 0.7% The phenomenon that mould, so the good die casting instead of iron content (Fe) 0.8~1.0%.Containing a large amount of iron (Fe), metallic compound can be generated, Form hard spot.And when iron content (Fe) measured 1.2%, alloy flowability is reduced, damages the quality of casting, is shortened in die casting equipment The service life of metal assembly.Nickel (Ni) has the tendency that increasing tensile strength and hardness, corrosion resistance is influenced very as copper (Cu) Greatly.Want to improve elevated temperature strength heat resistance, just add in nickel (Ni) sometimes, but have the shadow of reduction in terms of corrosion resistance and thermal conductance It rings.Manganese (Mn) can improve cupric (Cu), the elevated temperature strength of siliceous (Si) alloy.If more than certain limit, Al-Si-Fe- is easily generated P+o{T*T f;X Mn quaternary compounds easily form hard spot and reduce thermal conductivity.Manganese (Mn) can prevent tying again for aluminium alloy Brilliant process improves recrystallization temperature, and can significant refinement recrystal grain.The refinement of recrystal grain mainly passes through MnAl6 Compound disperses particle has grown up to recrystal grain inhibition.Another effect of MnAl6 be can dissolved impurity iron (Fe), shape Reduce the adverse effect of iron into (Fe, Mn) Al6.Manganese (Mn) is the important element of aluminium alloy, can be individually added into the conjunction of Al-Mn binary Gold is added in together with other alloying elements, therefore contains manganese (Mn) in aluminium alloy mostly.Zinc (Zn) is if containing miscellaneous Matter zinc (Zn), high-temperature brittleness is big, but is formed with mercury (Hg) and strengthen HgZn2 apparent intensity effects to alloy generation.Regulation exists in JIS Within 1.0%, but foreign standard has the zinc (Zn) for the of course not alloy composition to 3%, said here, but with zinc impurities (Zn) for role, it has the tendency that cracking casting.Chromium (Cr) chromium (Cr) formed in aluminium (CrFe) Al7 and (CrMn) intermetallic compounds such as Al12 hinder the forming core and growth process of recrystallization, there is certain invigoration effect to alloy, also Alloy ductility can be improved and reduce stress corrosion opening cracking maleate sensitivity.But quenching sensitive can be increased.Titanium (Ti) only needs in the alloy It is micro to improve mechanical performance, but conductivity declines.When Al-Ti systems alloy generates peritectic reaction, critical the containing of titanium (Ti) Amount about 0.15%, can be reduced if any boron presence.Also there are calcium (Ca), lead (Pb), tin (Sn) etc. are miscellaneous sometimes in aluminium alloy Prime element.These elements are since fusing point height differs, and structure is different, and the compound formed with aluminium (Al) also differs, thus right The influence of aluminium alloy capability is each different.Calcium (Ca) solid solubility in aluminium is extremely low, and CaAl4 compounds, calcium are formed with aluminium (Al) (Ca) aluminium alloy cutting ability can be improved.Lead (Pb), tin (Sn) is low-melting-point metal, their solid solubility in aluminium (Al) are little, Alloy strength is reduced, but cutting ability can be improved.Every essential element and trace element are to casting character and casting in kirsite It is main ingredient to the influence aluminium (Al) of part performance, has improvement mechanical performance, improves the effect of mobility, can prevent iron (Fe) It corrodes and corrodes.It can become fragile more than 4.5%, less than 3.5% intensity, hardness can reduce, and mobility is deteriorated.Copper (Cu) copper (Cu) contains Amount can significantly increase the intensity and hardness of alloy more than 1.25%.But the precipitation of Al-Cu can shrink after die casting casting, then turn For expansion, make casting dimension unstable.For intercrystalline corrosion is inhibited to add in a small amount of magnesium (Mg), magnesium (Mg's) contains magnesium (Mg) Amount has been more than specified value, mobility will be made to be deteriorated, and also easily generates red brittleness, and impact value also reduces.Lead (Pb) tin (Sn) increase of cadmium (Cd) lead (Pb) content can reduce the hardness of zinc (Zn), increase the solubility of zinc (Zn), but containing aluminium (Al):o_;In the kirsite of l S%E, lead (Pb), tin (Sn), any one is more than specified amount to cadmium (Cd), can all generate corrosion. This corrosion is irregular, is just generated after certain time, and under high temperature, high wet atmosphere, corrodes special.Iron (Fe) although the recrystallization temperature of zinc (Zn) can be significantly improved, slow down the process of recrystallization, in die casting melting, iron (Fe) from iron crucible, gooseneck and fusing apparatus, zinc (Zn) is solid-solution in, the iron (Fe) of aluminium (Al) institute band is denier, is surpassed Having crossed the iron (Fe) of solid solution limit can be crystallized out with FeAl3.(Fe) the defects of caused by, generates dregs with the compound of FeAl3 more Float.Casting becomes fragile, and machinability is deteriorated.The mobility of iron can influence the smoothness of cast(ing) surface.
Currently, the cylinder body of petrol engine is divided to two kinds of cast iron and cast aluminium.In diesel engine, cast iron housing accounts for exhausted big portion Point.From the point of view of using, the advantage of cast aluminium cylinder block be exactly it is light-weight, by mitigate weight realize it is fuel-efficient.In addition to the difference in weight In addition, in process of production, cast iron housing and cast aluminium cylinder block also have many differences.Cast Iron Production line takes up a large area, and to big, adds Work complex process;And the productive prospecting of cast aluminium cylinder block is just the opposite.Iron is different with the physical property of aluminium.The cylinder body thermic load of cast iron Ability is stronger, in terms of the power per liter of engine, the potentiality bigger of cast iron.Aluminium rotor housing engine interior still some make Cylinder iron material, particularly cylinder will use cast iron materials.The disadvantage of aluminium engine is volume first.Due to aluminium proportion compared with Gently, therefore the unit volume structural strength of aluminium is just less than cast iron, so the volume of aluminum cylinder would generally be bigger by one than cast iron A bit, it is extremely difficult to the compact and small size of cast iron housing.Secondly corrosion resistance and intensity.It is well known that aluminium easily with burning When the water that generates chemically react, therefore, corrosion resistance is far away from cast iron housing, especially to temperature pressure all requirements at the higher level Supercharged engine is even more so.It is the friction coefficient of engine again.Cast iron housing is also an advantage over all-aluminium engine.Therefore this Shen Automobile engine please just perfectly solves the above problem, and produce according to the present processes with aluminum alloy die casting 20 kilograms lighter than cast-iron-block powerplant or so of cast aluminium cylinder block engine.
Compared to traditional casting, die-cast rotor housing has the advantage that:
(1) it is efficient.In all casting methods, die casting is a kind of highest method of productivity.This is mainly by pressing What the characteristics of casting process, determined, and as production process mechanization, the degree of automation further develop and improve.Production one The time of a cylinder body is generally 3 minutes or so, and relatively traditional low pressure or sand casting are time saving and energy saving:(2) the high a of precision is only needed Individual sites processing can be used:(3) intensity of casting and case hardness are higher;
(4) energy-saving is consumed.General every equipment can produce 70,000 or so every year:(5) floor space is few.
(6) process route is short.Traditional casting technique, cylinder body production need by moulding, coremaking, cast, cool down, fall Sand, cleaning, machine add, all multi-process such as heat treatment.And die casting then need to only shift to an earlier date processing mold, quickly cast cylinder blank after cast Part takes out from die casting island or by artificial removal's burr, tests, processes later.
Description of the drawings
Fig. 1 is the X-ray diffractogram of the automobile engine aluminum alloy die casting of embodiment 1, embodiment 2 and embodiment 3 Spectrum.
Fig. 2 is the high resolution transmission electron microscope shape appearance figure of the automobile engine aluminum alloy die casting of embodiment 1.
Specific embodiment
The present invention is described in further details below in conjunction with the accompanying drawings.
Embodiment 1:In embodiment, aluminium alloy includes silicon Si 6.5%, copper Cu 3%, iron Fe by weight percentage 0.5%, magnesium Mg 0.25%, manganese Mn 0.53%, zinc Zn0.8%, erbium Er be .014%, thulium Tm0.003%, lutetium Lu0.014%, Nickel 0.05%, lead Pb0.04%, tin Sn < 0.4%, 2.25% surplus of mercury Hg1/30 (zinc Zn0.8%), M be aluminium, wherein M To be one or more in titanium Ti, zirconium Zr and hafnium Hf, the preparation method includes the following steps:
1) dispensing:Each raw material of the mass percent purity not less than 99% is weighed according to the composition expressions of alloy Dispensing;
2) master alloy ingot is prepared:Induction melting furnace or arc-melting furnace are preheated under 300 degrees celsius, preheats 30-60 Minute;The copper that step 1) prepares, iron, 1/2 magnesium, manganese, erbium, thulium, lutetium, nickel, lead, tin, aluminium is added to induction melting furnace or electric arc melts In furnace, and 750 degrees Celsius are heated to, add in monocrystalline silicon particle, and stir after raw material all fusing, keep the temperature 1- 2 hours;Mercury and zinc powder are mixed and heated to 430 degrees Celsius, is allowed to melt and be sufficiently stirred, then keeps the temperature 1-2 hours;Then Mercury zinc mixed molten liquid is added in induction melting furnace or arc-melting furnace and is sufficiently stirred;Above-mentioned alloy molten process is all true It is carried out under empty condition;Then covering refining deslagging agent, releases vacuum condition, and it is Celsius in 2 hours temperature to be reduced to 300 Degree, then skims;It adds 1/2 magnesium and is heated to 710 degrees Celsius, vacuumize and stir evenly, and keep the temperature 30 minutes;Release vacuum shape State is skimmed;Then alloy molten solution is poured to having been warmed up into 330 degrees Celsius of crucible, forms master alloy ingot, and 500 It anneals 5 hours under degrees celsius;
3) master alloy re melting process:Master alloy ingot is put into induction melting furnace or arc-melting furnace, it will in 40 minutes Temperature is heated to 800 degrees Celsius of remeltings, adds in M and stirs evenly, be then cooled to 550 degrees Celsius, keeps the temperature 7-10 hours so that Cu atoms form the orderly atom phase cluster of even dispersion distribution with M atoms in heat treatment process in alloy, avoid the formation of The acicular crystal of FeAl3, manganese atom forms MnAl6 compounds with aluminium atom can effectively reduce the harm of iron tramp, simultaneously MnAl6 compounds form dispersoid particle in heat treatment process, improve recrystallization temperature, refine recrystal grain, and prevention is tied again Jingjing grain length is big;550 degrees Celsius of temperature is kept, and it is for use to cover refining deslagging agent;
4) die casting:Temperature is promoted afterwards to 730 degrees Celsius in step 3), is removed the gred, is then cooled to 630-660 degrees Celsius of preparation Mold is preheated to 120-150 degrees Celsius by die casting, and 10-15 microns of releasing agent is then sprayed into mold, continues to heat mold Then temperature steadily inputs aluminium alloy to 300-320 degrees Celsius into mold, aluminium alloy input time is less than 5 seconds, and quickly adds Solidification and crystallization is pressed, is pressurized to 110-150MPa, keeps pressure 30 seconds, die cast;
5) it is heat-treated:The die casting that step 4) obtains is heat-treated using pure hydrogen and purity oxygen burning, at 2 hours It is interior that temperature is promoted to 510 degrees Celsius, and keep the temperature 3-5 hours;
6) quenching treatment:Isolation sealing is carried out to the die casting through Overheating Treatment using pure hydrogen and then is cooled down in a water bath To 400 degrees Celsius, quenching treatment is then carried out in 30 degrees Celsius of warm water;
7) temper:Die casting Jing Guo quenching treatment is put into tempering furnace and is heated to 150 degrees Celsius, and is kept the temperature 20-30 minutes;
8) finished product:Obtained automobile engine aluminum alloy die casting.
Embodiment 2:In embodiment, aluminium alloy includes silicon Si8.5%, copper Cu 3%, iron Fe by weight percentage 0.6%, magnesium Mg0.25%, manganese Mn0.53%, zinc Zn0.8%, erbium Er0.010%, thulium Tm0.003%, lutetium Lu0.005%, nickel 2.25% surplus of Ni 0.05%, lead Pb0.04%, tin Sn0.03%, mercury Hg1/30 (zinc Zn0.8%), M is aluminium, and wherein M is One or more in titanium Ti, zirconium Zr and hafnium Hf, the preparation method includes the following steps:
1) dispensing:Each raw material of the mass percent purity not less than 99% is weighed according to the composition expressions of alloy Dispensing;
2) master alloy ingot is prepared:Induction melting furnace or arc-melting furnace are preheated under 300 degrees celsius, preheats 30-60 Minute;The copper that step 1) prepares, iron, 1/2 magnesium, manganese, erbium, thulium, lutetium, nickel, lead, tin, aluminium is added to induction melting furnace or electric arc melts In furnace, and 750 degrees Celsius are heated to, add in monocrystalline silicon particle, and stir after raw material all fusing, keep the temperature 1- 2 hours;Mercury and zinc powder are mixed and heated to 430 degrees Celsius, is allowed to melt and be sufficiently stirred, then keeps the temperature 1-2 hours;Then Mercury zinc mixed molten liquid is added in induction melting furnace or arc-melting furnace and is sufficiently stirred;Above-mentioned alloy molten process is all true It is carried out under empty condition;Then covering refining deslagging agent, releases vacuum condition, and it is Celsius in 2 hours temperature to be reduced to 300 Degree, then skims;It adds 1/2 magnesium and is heated to 710 degrees Celsius, vacuumize and stir evenly, and keep the temperature 30 minutes;Release vacuum shape State is skimmed;Then alloy molten solution is poured to having been warmed up into 330 degrees Celsius of crucible, forms master alloy ingot, and 500 It anneals 5 hours under degrees celsius;
3) master alloy re melting process:Master alloy ingot is put into induction melting furnace or arc-melting furnace, it will in 40 minutes Temperature is heated to 800 degrees Celsius of remeltings, adds in M and stirs evenly, be then cooled to 550 degrees Celsius, keeps the temperature 7-10 hours so that Cu atoms form the orderly atom phase cluster of even dispersion distribution with M atoms in heat treatment process in alloy, avoid the formation of The acicular crystal of FeAl3, manganese atom forms MnAl6 compounds with aluminium atom can effectively reduce the harm of iron tramp, simultaneously MnAl6 compounds form dispersoid particle in heat treatment process, improve recrystallization temperature, refine recrystal grain, and prevention is tied again Jingjing grain length is big;550 degrees Celsius of temperature is kept, and it is for use to cover refining deslagging agent;
4) die casting:Temperature is promoted afterwards to 730 degrees Celsius in step 3), is removed the gred, is then cooled to 630-660 degrees Celsius of preparation Mold is preheated to 120-150 degrees Celsius by die casting, and 10-15 microns of releasing agent is then sprayed into mold, continues to heat mold Then temperature steadily inputs aluminium alloy to 300-320 degrees Celsius into mold, aluminium alloy input time is less than 5 seconds, and quickly adds Solidification and crystallization is pressed, is pressurized to 110-150MPa, keeps pressure 30 seconds, die cast;
5) it is heat-treated:The die casting that step 4) obtains is heat-treated using pure hydrogen and purity oxygen burning, at 2 hours It is interior that temperature is promoted to 510 degrees Celsius, and keep the temperature 3-5 hours;
6) quenching treatment:Isolation sealing is carried out to the die casting through Overheating Treatment using pure hydrogen and then is cooled down in a water bath To 400 degrees Celsius, quenching treatment is then carried out in 30 degrees Celsius of warm water;
7) temper:Die casting Jing Guo quenching treatment is put into tempering furnace and is heated to 150 degrees Celsius, and is kept the temperature 20-30 minutes;
8) finished product:Obtained automobile engine aluminum alloy die casting.
Embodiment 3:In embodiment, aluminium alloy includes silicon Si8.5%, copper Cu%, iron Fe by weight percentage 0.5%, magnesium Mg0.25%, manganese Mn 0.17%, zinc Zn1.65%, erbium Er0.01%, thulium Tm0.001%, lutetium Lu0.012%, nickel 2.25% surplus of Ni 0.02%, lead Pb0.04%, tin Sn0.03%, mercury Hg1/30 (zinc Zn1.65%), M is aluminium, and wherein M is One or more in titanium Ti, zirconium Zr and hafnium Hf, the preparation method includes the following steps:
1) dispensing:Each raw material of the mass percent purity not less than 99% is weighed according to the composition expressions of alloy Dispensing;
2) master alloy ingot is prepared:Induction melting furnace or arc-melting furnace are preheated under 300 degrees celsius, preheats 30-60 Minute;The copper that step 1) prepares, iron, 1/2 magnesium, manganese, erbium, thulium, lutetium, nickel, lead, tin, aluminium is added to induction melting furnace or electric arc melts In furnace, and 750 degrees Celsius are heated to, add in monocrystalline silicon particle, and stir after raw material all fusing, keep the temperature 1- 2 hours;Mercury and zinc powder are mixed and heated to 430 degrees Celsius, is allowed to melt and be sufficiently stirred, then keeps the temperature 1-2 hours;Then Mercury zinc mixed molten liquid is added in induction melting furnace or arc-melting furnace and is sufficiently stirred;Above-mentioned alloy molten process is all true It is carried out under empty condition;Then covering refining deslagging agent, releases vacuum condition, and it is Celsius in 2 hours temperature to be reduced to 300 Degree, then skims;It adds 1/2 magnesium and is heated to 710 degrees Celsius, vacuumize and stir evenly, and keep the temperature 30 minutes;Release vacuum shape State is skimmed;Then alloy molten solution is poured to having been warmed up into 330 degrees Celsius of crucible, forms master alloy ingot, and 500 It anneals 5 hours under degrees celsius;
3) master alloy re melting process:Master alloy ingot is put into induction melting furnace or arc-melting furnace, it will in 40 minutes Temperature is heated to 800 degrees Celsius of remeltings, adds in M and stirs evenly, be then cooled to 550 degrees Celsius, keeps the temperature 7-10 hours so that Cu atoms form the orderly atom phase cluster of even dispersion distribution with M atoms in heat treatment process in alloy, avoid the formation of The acicular crystal of FeAl3, manganese atom forms MnAl6 compounds with aluminium atom can effectively reduce the harm of iron tramp, simultaneously MnAl6 compounds form dispersoid particle in heat treatment process, improve recrystallization temperature, refine recrystal grain, and prevention is tied again Jingjing grain length is big;550 degrees Celsius of temperature is kept, and it is for use to cover refining deslagging agent;
4) die casting:Temperature is promoted afterwards to 730 degrees Celsius in step 3), is removed the gred, is then cooled to 630-660 degrees Celsius of preparation Mold is preheated to 120-150 degrees Celsius by die casting, and 10-15 microns of releasing agent is then sprayed into mold, continues to heat mold Then temperature steadily inputs aluminium alloy to 300-320 degrees Celsius into mold, aluminium alloy input time is less than 5 seconds, and quickly adds Solidification and crystallization is pressed, is pressurized to 110-150MPa, keeps pressure 30 seconds, die cast;
5) it is heat-treated:The die casting that step 4) obtains is heat-treated using pure hydrogen and purity oxygen burning, at 2 hours It is interior that temperature is promoted to 510 degrees Celsius, and keep the temperature 3-5 hours;
6) quenching treatment:Isolation sealing is carried out to the die casting through Overheating Treatment using pure hydrogen and then is cooled down in a water bath To 400 degrees Celsius, quenching treatment is then carried out in 30 degrees Celsius of warm water;
7) temper:Die casting Jing Guo quenching treatment is put into tempering furnace and is heated to 150 degrees Celsius, and is kept the temperature 20-30 minutes;
9) finished product:Obtained automobile engine aluminum alloy die casting.

Claims (3)

1. a kind of preparation method of automobile engine aluminum alloy die casting, which is characterized in that the aluminium alloy is included with weight The silicon Si 6.5-8.5% of percentages, copper Cu 1-3%, iron Fe 0.5-0.6%, magnesium Mg 0.1-0.25%, manganese Mn 0.17- 0.53%, zinc Zn0.8-1.65%, erbium Er < 0.015%, thulium Tm < 0.004%, lutetium Lu < 0.015%, nickel < 0.06%, Lead Pb < 0.05%, tin Sn < 0.05%, mercury Hg1/30 (zinc Zn0.8-1.65%), M 1.1-2.25% surpluses be aluminium, wherein M To be one or more in titanium Ti, zirconium Zr and hafnium Hf, the preparation method includes the following steps:
1) dispensing:Each raw material of the mass percent purity not less than 99% weigh matching according to the composition expressions of alloy Material;
2) master alloy ingot is prepared:Induction melting furnace or arc-melting furnace are preheated under 300 degrees celsius, is preheated 30-60 minutes; The copper that step 1) is prepared, iron, 1/2 magnesium, manganese, erbium, thulium, lutetium, nickel, lead, tin, aluminium are added to induction melting furnace or arc-melting furnace In, and 750 degrees Celsius are heated to, monocrystalline silicon particle is added in, and stir after raw material all fusing, heat preservation 1-2 is small When;Mercury and zinc powder are mixed and heated to 430 degrees Celsius, is allowed to melt and be sufficiently stirred, then keeps the temperature 1-2 hours;Then will Mercury zinc mixed molten liquid is added in induction melting furnace or arc-melting furnace and is sufficiently stirred;Above-mentioned alloy molten process is all in vacuum Under the conditions of carry out;Then covering refining deslagging agent, releases vacuum condition, and temperature is reduced to 300 degrees Celsius in 2 hours, Then it skims;It adds 1/2 magnesium and is heated to 710 degrees Celsius, vacuumize and stir evenly, and keep the temperature 30 minutes;Release vacuum state, It skims;Then alloy molten solution is poured to having been warmed up into 330 degrees Celsius of crucible, forms master alloy ingot, and Celsius 500 It anneals 5 hours under the conditions of degree;
3) master alloy re melting process:Master alloy ingot is put into induction melting furnace or arc-melting furnace, by temperature in 40 minutes 800 degrees Celsius of remeltings are heated to, add in M and are stirred evenly, are then cooled to 550 degrees Celsius, keep the temperature 7-10 hours so that Cu is former Son forms the orderly atom phase cluster of even dispersion distribution with M atoms in heat treatment process in alloy, avoids the formation of FeAl3 Acicular crystal, manganese atom and aluminium atom, which form MnAl6 compounds, can effectively reduce the harm of iron tramp, while in Re Chu MnAl6 compounds form dispersoid particle during reason, improve recrystallization temperature, refine recrystal grain, prevent recrystal grain It grows up;550 degrees Celsius of temperature is kept, and it is for use to cover refining deslagging agent;
4) die casting:Temperature is promoted afterwards to 730 degrees Celsius in step 3), is removed the gred, and is then cooled to 630-660 degrees Celsius and is prepared pressure Casting, 120-150 degrees Celsius is preheated to by mold, and 10-15 microns of releasing agent is then sprayed into mold, continues to heat mold temperature Then degree steadily inputs aluminium alloy, aluminium alloy input time is less than 5 seconds, and Quick-pressing to 300-320 degrees Celsius into mold Solidification and crystallization is pressurized to 110-150MPa, keeps pressure 30 seconds, die cast;
5) it is heat-treated:The die casting that step 4) obtains is heat-treated using pure hydrogen and purity oxygen burning, it will in 2 hours Temperature is promoted to 510 degrees Celsius, and keeps the temperature 3-5 hours;
6) quenching treatment:Isolation sealing is carried out to the die casting through Overheating Treatment using pure hydrogen and then is cooled in a water bath 400 degrees Celsius, quenching treatment is then carried out in 30 degrees Celsius of warm water;
7) temper:Die casting Jing Guo quenching treatment is put into tempering furnace and is heated to 150 degrees Celsius, and keeps the temperature 20-30 Minute;
8) finished product:Obtained automobile engine aluminum alloy die casting.
2. the preparation method of automobile engine aluminum alloy die casting according to claim 1, which is characterized in that the M is Titanium Ti and zirconium Zr, and titanium Ti is 1.3 times of zirconium Zr.
3. the preparation method of automobile engine aluminum alloy die casting according to claim 1, which is characterized in that described M is titanium Ti, zirconium Zr and hafnium Hf, and titanium Ti:Zirconium Zr:Hafnium Hf is 3:2:1.
CN201711233806.5A 2017-11-29 2017-11-29 A kind of preparation method of automobile engine aluminum alloy die casting Pending CN108165839A (en)

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CN109274051A (en) * 2018-08-28 2019-01-25 宁波盈泰电气有限公司 Concentration bus duct
CN110656351A (en) * 2019-10-28 2020-01-07 昆明冶金研究院 Preparation method of segment-clamping type copper-aluminum beam for zinc electrodeposition
CN111676404A (en) * 2020-07-07 2020-09-18 广东鸿特精密技术(台山)有限公司 Improved die casting forming method
CN113564424B (en) * 2021-07-02 2022-02-08 浙江希杰金属科技有限公司 Preparation process of high-strength spool

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CN106498243A (en) * 2015-09-08 2017-03-15 浙江荣荣实业有限公司 A kind of pack alloy radiator dedicated aluminium alloy material and preparation method thereof
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CN1605647A (en) * 2003-10-10 2005-04-13 仁宝电脑工业股份有限公司 Aluminum alloy die casting parts
CN103276260A (en) * 2013-05-24 2013-09-04 怡球金属资源再生(中国)股份有限公司 Aluminum alloy ingot for high-zinc car and production method thereof
CN106498243A (en) * 2015-09-08 2017-03-15 浙江荣荣实业有限公司 A kind of pack alloy radiator dedicated aluminium alloy material and preparation method thereof
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109274051A (en) * 2018-08-28 2019-01-25 宁波盈泰电气有限公司 Concentration bus duct
CN110656351A (en) * 2019-10-28 2020-01-07 昆明冶金研究院 Preparation method of segment-clamping type copper-aluminum beam for zinc electrodeposition
CN111676404A (en) * 2020-07-07 2020-09-18 广东鸿特精密技术(台山)有限公司 Improved die casting forming method
CN113564424B (en) * 2021-07-02 2022-02-08 浙江希杰金属科技有限公司 Preparation process of high-strength spool

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Application publication date: 20180615