CN107866548B - Aluminum alloy die casting blank precise forming process - Google Patents

Aluminum alloy die casting blank precise forming process Download PDF

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Publication number
CN107866548B
CN107866548B CN201710974793.0A CN201710974793A CN107866548B CN 107866548 B CN107866548 B CN 107866548B CN 201710974793 A CN201710974793 A CN 201710974793A CN 107866548 B CN107866548 B CN 107866548B
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temperature
sand
sand mold
wax
aluminum alloy
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CN107866548A (en
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周志明
王刚
孙玉虎
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Jiangsu Xianghe Electronic Science & Technology Co Ltd
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Jiangsu Xianghe Electronic Science & Technology Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/09Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C7/00Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02Lost patterns
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/02Sand moulds or like moulds for shaped castings
    • B22C9/04Use of lost patterns
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04Influencing the temperature of the metal, e.g. by heating or cooling the mould
    • 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

Abstract

Aluminum alloy die casting blank precise forming process, includes the following steps:Step 1: according to the structure fabrication mold of casting;Step 2: suppressing wax-pattern and sprue cup, cross gate, sprue and ingate using wax injector, and to wax-pattern repairing type, wax module group type is carried out according to constitutional diagram, then to the wax-pattern oil removing after combination;Step 3: carrying out multilayer hanging sand to the wax-pattern for having organized type above;Step 4: dewaxing, from dry no less than 20 hours under ventilation condition, formwork roasts formwork in chamber type electric resistance furnace, and formwork is examined after being cooled to room temperature after dewaxing;Step 5: the formwork through washing must carry out drying shell process;Step 6: carrying out moulding using water-glass sand, processing then is dried to sand mold;Step 7: smelting aluminium alloy melt, is poured into a mould using pressure regulation, when crystallization time reaches half, the temperature of sand mold is made to reduce by 5 10s, the temperature that sand mold reduces is 24 DEG C;Step 8: clearing up casting;Step 9: being heat-treated to casting.

Description

Aluminum alloy die casting blank precise forming process
Technical field
The present invention relates to hot investment casting technical field of aluminum alloy technology, and in particular to aluminum alloy die casting blank precise forming technique Method.
Background technology
Aluminium alloy is most widely used one kind non-ferrous metal structural material in industry, in Aeronautics and Astronautics, automobile, machinery It has been widely applied in manufacture, ship aluminium alloy and chemical industry.Cast aluminium alloy gold density is low, but intensity is relatively high, approaches or super High-quality steel is crossed, plasticity is good, can be processed into various proximate matters, has excellent electric conductivity, thermal conductivity and corrosion stability, has sizable Market potential belongs to field of new materials, and usage amount industrially is only second to steel.With modern industry and the hair of casting technology Exhibition, it is also increasing to cast aluminium alloy gold demand.
Currently, China's aluminum alloy die casting, which manufactures mode, is mainly presented following several forms:Sand casting, gravity casting It makes, the casting of low pressure casting, compression casting and precise forming.
Aluminium alloy blank microdiecast is to make liquid or semi-liquid metal high-speed filling casting mold under high pressure effect, and pressing The casting method of casting is frozen under power.With scientific and technical and industrial economy rapid development in recent years, the knot of die casting Structure becomes increasingly complex, and to the higher requirement that the integrated of all kinds of aluminum alloy die castings, lightweight, reliability propose, is closed to aluminium Higher requirements are also raised for the dimensional accuracy and surface quality of golden die casting.However the country is in entire aluminium processing industry at present In, there is a serious shortage of the foundry engieerings and experience of precision aluminium-alloy casting, during producing aluminum alloy die casting, the aluminium of melting Alloy molten solution carries a large amount of gases existing in the form of bubbles, will appear many holes to enable aluminum alloy to die casting surface, Hole makes the reduction of aluminum alloy die casting quality, seriously results even in aluminum alloy die casting and scraps.Cast hole quantity and Size is to weigh the leading indicator of Mechanical processing of casting surface quality, and casting hole is the main original for influencing aluminum alloy die casting elongation percentage Cause, and fatigue crack source often primarily occur ins hole close quarters, so the hole that die casting generates is to influence aluminium alloy pressure The principal element of casting mechanical performance.Hole property, size and the difference of distribution, result in aluminum alloy die casting mechanical property Difference.
It is unavoidable in the appearance of casting industry Hole, when aperture is smaller and appears in inside aluminum alloy die casting When, it will not usually make a big impact to workpiece quality.If but appearing in machining surface and just will have a direct impact on aluminium alloy compression casting The surface quality and fatigue behaviour of part.
Invention content
In order to solve more produced aluminum alloy die casting surface hole defect, quality and mechanical performance is poor and rejection rate mistake High technical problem, the object of the present invention is to provide aluminum alloy die casting blank precise forming processes, enable aluminum alloy to die casting Most of holes on part are evenly distributed on inside aluminum alloy die casting, effectively reduce hole in final surface exposed probability, Simultaneously reduce generation hole aperture, improves the surface quality of aluminum alloy die casting, enhance the machinery of aluminum alloy die casting Performance, while greatly reducing rejection rate.
The technical solution adopted in the present invention is:Aluminum alloy die casting blank precise forming process, including following step Suddenly:
Step 1: according to the structure fabrication mold of casting, Casting shrinkage 0.5%-1.0%, pattern draft is 1 '- 3′;
Step 2: suppress wax-pattern and sprue cup, cross gate, sprue and ingate using wax injector, and to wax-pattern repairing type, Wax module group type is carried out according to constitutional diagram, then to the wax-pattern oil removing after combination;
Step 3: carrying out multilayer hanging sand to the wax-pattern for having organized type above;
Step 4: carrying out dewaxing process, formwork is no less than 20 hours under ventilation condition from dry after dewaxing, then formwork is put It is roasted in chamber type electric resistance furnace, formwork cools to 450 DEG C or less taking-ups with the furnace after the completion of roasting, and mould is examined after being cooled to room temperature Shell;
Step 5: the formwork through washing must carry out drying shell process;
Step 6: carrying out moulding using water-glass sand, processing then is dried to sand mold;
Step 7: smelting aluminium alloy melt, is poured into a mould using pressure regulation, pouring temperature is 765-775 DEG C, and it is 350- to synchronize and build pressure 400KPa, liter hydraulic coupling are 5-10KPa, and liter liquid speed degree is 250-300mm/s, and mold filling pressure difference is 60-100KPa, filling velocity Make sand mold when crystallization time reaches half for 250-300mm/s, crystallization pressure 2-3KPa, crystallization time 200-250s Temperature reduce 5-10s, sand mold reduce temperature be 2-4 DEG C;
Step 8: clear up casting, using the clear shell of waterpower or the clear shell of dry blast, using sawing machine cut-fill system, Blast is carried out using blowing machine;
Step 9: being heat-treated to casting.
The baking shell temperature of baking shell process is in the step 5:380 DEG C, >=3 hours are kept the temperature, with using paper after being furnace-cooled to room temperature Seal cast styling.
Dewaxing parameter is in the dewaxing process:Outer courage steam pressure is 0.25-0.35MPa, and the dewaxing time is 11- 12min, dewaxing temperature are 135-145 DEG C.
The formwork, which is placed in chamber type electric resistance furnace, to be roasted, and roasting parameter is:Furnace temperature formwork when 265-275 DEG C enters stove, with After be warming up to 790-820 DEG C, keep the temperature 2-3 hours, close power supply after the completion.
The group of the molten aluminium alloy becomes:Silicon 9.5-12.5%, copper 2.5-3.5%, nickel 0.5-0.75%, magnesium 3.5- 4.5%, zinc 7.5-8.5%, manganese 2.5-3.5%, titanium 0.9-1.1%, chromium 1.5-2.5%, europium 0.01-0.015%, holmium 0.002- 0.004%, lutetium 0.01-0.015%, surplus is aluminium.
The specific preparation method of water-glass sand in the step 6 is:It chooses Foundry sand and is incorporated as into roughing sand The waterglass of its weight 6.5%-7.5% is put into sand mixer and is uniformly mixed as adhesive later.
The step 6 is to carry out moulding using water-glass sand, and gas hole is then pricked on sand mold, which is from sand Type outer surface extends to the blind hole inside sand mold, then the protective cover sealed in the end face of sand mold, is arranged on the protective cover There is blow vent, mould surface is dried from the blow vent of protective cover to being passed through hot wind inside it, hot blast temperature 150-180 DEG C, wind speed 5-6m/s, time 15-20min remove protective cover later, and nitrogen, gas are then passed through into the gas hole of sand mold Flow velocity degree is 5-6m/s, and gas temperature is 23-27 DEG C, time 5-10s.
Heat treatment includes the following steps in the step 9:A, first stage homogenization heat treatment:Aluminium alloy castings are put Enter in heat-treatment heater, by room temperature to 235-245 DEG C of progress isothermal holding, soaking time 37-40h;B, second Stage homogenization heat treatment:It is continuously heating to 355-385 DEG C of progress isothermal holding, soaking time 15-20h;C, the phase III Homogenization heat treatment:It is continuously heating to 480-500 DEG C of progress isothermal holding, soaking time 10-15h;D, fourth stage is uniform Change heat treatment:It is continuously heating to 555-565 DEG C of progress isothermal holding, soaking time 0.5-1h;Casting is finally cooled to room Temperature.
Preferably, in the step 7 when crystallization time reaches half, by making sand mold temperature drop to sand mold spray drying ice Low 2-4 DEG C.
Preferably, it in the step 7 when crystallization time reaches half, is dried to sand mold using wind turbine, to make sand mold Temperature reduces 2-4 DEG C.
Compared with prior art, the invention has the advantages that:
Aluminum alloy die casting blank precise forming process of the present invention, step is simple, easy to implement, thus Under the conditions of resource and energy consumption are lower, semifinished product precision is made to meet the requirements, through the invention in process enable aluminum alloy to The integrated of die casting, lightweight, reliability greatly improve;
Since the molten aluminium alloy of melting carries a large amount of gases existing in the form of bubbles, to enable aluminum alloy to die casting Surface will appear many holes, and the present invention pours into a mould molten aluminium alloy using pressure regulation, and when crystallization time reaches half, makes sand The temperature of type reduces 5-10s, to make the molten aluminium alloy temperature at die casting surface close to sand mold reduce, in pressure The molten aluminium alloy temperature of cast-internal is more than the molten aluminium alloy temperature at die casting surface, forms temperature difference, temperature Higher molten aluminium alloy is moved to the lower molten aluminium alloy direction of temperature, and reaction force drives bubble to temperature higher position It is mobile, it shifts to inside die-casting part to which the bubble enabled aluminum alloy in melt is disturbed, effectively reduces hole final Surface exposed probability improves the surface quality of aluminum alloy die casting, improves aluminum alloy die casting elongation percentage, while significantly Reduce rejection rate;Process of the present invention enables aluminum alloy to most of holes on die casting and is evenly distributed on aluminium alloy Inside die-casting part effectively reduces hole in final surface exposed probability, while generation hole aperture being made to reduce, and improves product machine Tool performance and mechanical property, to solve in actual production because hole is exposed and rejection rate is excessively high when die casting being caused to be processed The problem of, improve product quality;
By making the reduction of sand mold temperature to sand mold spray drying ice, to enable aluminum alloy to die casting entirety uniform decrease in temperature, Bu Huiyin Local temperature differential is excessively high to make bubble coalescence, to keep bubble distribution more uniform, effectively reduces bubble to aluminum alloy die casting The influence of mechanical performance and mechanical property;
Molten aluminium alloy of the present invention, not only good fluidity are suitble to the hot investment casting of heavy castings, and as cast condition Casting has very high tensile strength and good ductility, is improved by the mechanical property of product after heat treatment, has There are higher tensile strength, higher yield strength and elongation percentage, product quality is made to greatly improve;
The used drying means period is shorter when processing is dried to sand mold in the present invention, to using hot wind outside sand mold It is dry, it is passed through nitrogen in air hole and is dried, compared with traditional gas hardening, drying means of the present invention can Contained humidity in sand mold uniformly is sloughed, nitrogen is passed through in air hole, accelerates setting rate, and make sand hardness higher, sand mold It is unlikely to deform, improves die casting efficiency.
Specific implementation mode
With reference to specific embodiment, the present invention is further elaborated, and protection scope of the present invention is not limited to following Embodiment.Process, condition, the reagent etc. for implementing the present invention, are the universal of this field in addition to the following content specially referred to Content is not particularly limited in knowledge and common knowledge, the present invention.
Embodiment 1
Aluminum alloy die casting blank precise forming process, includes the following steps:
Step 1: according to the structure fabrication mold of casting, Casting shrinkage 0.5%, pattern draft is 1 ';
Step 2: suppress wax-pattern and sprue cup, cross gate, sprue and ingate using wax injector, and to wax-pattern repairing type, Wax module group type is carried out according to constitutional diagram, then to the wax-pattern oil removing after combination;
Step 3: carrying out multilayer hanging sand to the wax-pattern for having organized type above;
Step 4: dewaxing, dewaxing parameter is:Outer courage steam pressure is 0.25MPa, and the dewaxing time is 11min, is used Temperature is 135 DEG C, and formwork is from dry no less than 20 hours under ventilation condition after dewaxing, and formwork roasts in chamber type electric resistance furnace, stove Temperature formwork when 265 DEG C enters stove, then raises temperature to 790 DEG C, keeps the temperature 2 hours, closes power supply after the completion, formwork cools to the furnace 450 DEG C or less taking-ups, formwork is examined after being cooled to room temperature;
Step 5: the formwork through washing must carry out drying shell process, shell temperature is dried:380 DEG C, >=3 hours are kept the temperature, with being furnace-cooled to After room temperature cast styling is sealed with paper;
Step 6: carrying out moulding using water-glass sand, processing then is dried to sand mold;
Step 7: smelting aluminium alloy melt, is poured into a mould using pressure regulation, pouring temperature is 765 DEG C, and it is 350KPa to synchronize and build pressure, It is 5KPa to rise hydraulic coupling, and liter liquid speed degree is 250mm/s, and mold filling pressure difference is 60KPa, filling velocity 250mm/s, crystallization pressure The temperature of sand mold is set to reduce 5s, the temperature that sand mold reduces when crystallization time reaches half for 2KPa, crystallization time 200s It is 2 DEG C;
Step 8: clear up casting, using the clear shell of waterpower or the clear shell of dry blast, using sawing machine cut-fill system, Blast is carried out using blowing machine;
Step 9: being heat-treated to casting.
The group of the molten aluminium alloy becomes:Silicon 9.5%, copper 2.5%, nickel 0.5%, magnesium 3.5%, zinc 7.5%, manganese 2.5%, titanium 0.9%, chromium 1.5%, europium 0.01%, holmium 0.002%, lutetium 0.01%, surplus is aluminium.
The specific preparation method of water-glass sand in the step 6 is:It chooses Foundry sand and is incorporated as into roughing sand The waterglass of its weight 6.5% is put into sand mixer and is uniformly mixed as adhesive later.
The step 6 is to carry out moulding using water-glass sand, and gas hole is then pricked on sand mold, which is from sand Type outer surface extends to the blind hole inside sand mold, then the protective cover sealed in the end face of sand mold, is arranged on the protective cover There is blow vent, mould surface is dried from the blow vent of protective cover to being passed through hot wind inside it, hot blast temperature is 150 DEG C, Wind speed is 5m/s, and time 15min removes protective cover later, and nitrogen is then passed through into the gas hole of sand mold, and air velocity is 5m/s, gas temperature are 23 DEG C, time 5s.
Heat treatment includes the following steps in the step 9:A, first stage homogenization heat treatment:Aluminium alloy castings are put Enter in heat-treatment heater, by room temperature to 235 DEG C of progress isothermal holdings, soaking time 37h;B, second stage is uniform Change heat treatment:It is continuously heating to 355 DEG C of progress isothermal holdings, soaking time 15h;C, phase III homogenization heat treatment:After It is continuous to be warming up to 480 DEG C of progress isothermal holdings, soaking time 10h;D, fourth stage homogenization heat treatment:It is continuously heating to 555 DEG C carry out isothermal holding, soaking time 0.5h;Finally casting is cooled to room temperature.
Preferably, in the step 7 when crystallization time reaches half, by making sand mold temperature drop to sand mold spray drying ice Low 2 DEG C.
In the step 7 when crystallization time reaches half, wind turbine can also be used to dry to sand mold, to make sand mold Temperature reduces by 2 DEG C.
Embodiment 2
Aluminum alloy die casting blank precise forming process, includes the following steps:
Step 1: according to the structure fabrication mold of casting, Casting shrinkage 0.7%, pattern draft is 2 ';
Step 2: suppress wax-pattern and sprue cup, cross gate, sprue and ingate using wax injector, and to wax-pattern repairing type, Wax module group type is carried out according to constitutional diagram, then to the wax-pattern oil removing after combination;
Step 3: carrying out multilayer hanging sand to the wax-pattern for having organized type above;
Step 4: dewaxing, dewaxing parameter is:Outer courage steam pressure is 0.3MPa, and the dewaxing time is 11.5min, is made It is 138 DEG C with temperature, from dry no less than 20 hours under ventilation condition, formwork roasts formwork in chamber type electric resistance furnace after dewaxing, Furnace temperature formwork when 270 DEG C enters stove, then raises temperature to 810 DEG C, keeps the temperature 2.5 hours, closes power supply, formwork furnace cooling after the completion It is taken out to 450 DEG C or less, formwork is examined after being cooled to room temperature;
Step 5: the formwork through washing must carry out drying shell process, shell temperature is dried:380 DEG C, >=3 hours are kept the temperature, with being furnace-cooled to After room temperature cast styling is sealed with paper;
Step 6: carrying out moulding using water-glass sand, processing then is dried to sand mold;
Step 7: smelting aluminium alloy melt, is poured into a mould using pressure regulation, pouring temperature is 770 DEG C, and it is 380KPa to synchronize and build pressure, It is 7KPa to rise hydraulic coupling, and liter liquid speed degree is 280mm/s, and mold filling pressure difference is 75KPa, filling velocity 270mm/s, crystallization pressure The temperature of sand mold is set to reduce 7s, the temperature that sand mold reduces when crystallization time reaches half for 2KPa, crystallization time 235s It is 3 DEG C;
Step 8: clear up casting, using the clear shell of waterpower or the clear shell of dry blast, using sawing machine cut-fill system, Blast is carried out using blowing machine;
Step 9: being heat-treated to casting.
The group of the molten aluminium alloy becomes:Silicon 10%, copper 3%, nickel 0.55%, magnesium 3.8%, zinc 7.8%, manganese 3%, titanium 1%, chromium 2%, europium 0.012%, holmium 0.003%, lutetium 0.013%, surplus is aluminium.
The specific preparation method of water-glass sand in the step 6 is:It chooses Foundry sand and is incorporated as into roughing sand The waterglass of its weight 7% is put into sand mixer and is uniformly mixed as adhesive later.
The step 6 is to carry out moulding using water-glass sand, and gas hole is then pricked on sand mold, which is from sand Type outer surface extends to the blind hole inside sand mold, then the protective cover sealed in the end face of sand mold, is arranged on the protective cover There is blow vent, mould surface is dried from the blow vent of protective cover to being passed through hot wind inside it, hot blast temperature is 175 DEG C, Wind speed is 5.5m/s, and time 17min removes protective cover later, and nitrogen, air velocity are then passed through into the gas hole of sand mold For 5.5m/s, gas temperature is 25 DEG C, time 8s.
Heat treatment includes the following steps in the step 9:A, first stage homogenization heat treatment:Aluminium alloy castings are put Enter in heat-treatment heater, by room temperature to 240 DEG C of progress isothermal holdings, soaking time 38h;B, second stage is uniform Change heat treatment:It is continuously heating to 375 DEG C of progress isothermal holdings, soaking time 18h;C, phase III homogenization heat treatment:After It is continuous to be warming up to 490 DEG C of progress isothermal holdings, soaking time 13h;D, fourth stage homogenization heat treatment:It is continuously heating to 560 DEG C carry out isothermal holding, soaking time 0.8h;Finally casting is cooled to room temperature.
Preferably, in the step 7 when crystallization time reaches half, by making sand mold temperature drop to sand mold spray drying ice Low 3 DEG C.
In the step 7 when crystallization time reaches half, wind turbine can also be used to dry to sand mold, to make sand mold Temperature reduces by 3 DEG C.
Embodiment 3
Aluminum alloy die casting blank precise forming process, includes the following steps:
Step 1: according to the structure fabrication mold of casting, Casting shrinkage 1.0%, pattern draft is 3 ';
Step 2: suppress wax-pattern and sprue cup, cross gate, sprue and ingate using wax injector, and to wax-pattern repairing type, Wax module group type is carried out according to constitutional diagram, then to the wax-pattern oil removing after combination;
Step 3: carrying out multilayer hanging sand to the wax-pattern for having organized type above;
Step 4: dewaxing, dewaxing parameter is:Outer courage steam pressure is 0.35MPa, and the dewaxing time is 12min, is used Temperature is 145 DEG C, and formwork is from dry no less than 20 hours under ventilation condition after dewaxing, and formwork roasts in chamber type electric resistance furnace, stove Temperature formwork when 275 DEG C enters stove, then raises temperature to 820 DEG C, keeps the temperature 3 hours, closes power supply after the completion, formwork cools to the furnace 450 DEG C or less taking-ups, formwork is examined after being cooled to room temperature;
Step 5: the formwork through washing must carry out drying shell process, shell temperature is dried:380 DEG C, >=3 hours are kept the temperature, with being furnace-cooled to After room temperature cast styling is sealed with paper;
Step 6: carrying out moulding using water-glass sand, processing then is dried to sand mold;
Step 7: smelting aluminium alloy melt, is poured into a mould using pressure regulation, pouring temperature is 775 DEG C, and it is 400KPa to synchronize and build pressure, It is 10KPa to rise hydraulic coupling, and liter liquid speed degree is 300mm/s, and mold filling pressure difference is 100KPa, filling velocity 300mm/s, crystallization pressure Power is 3KPa, crystallization time 250s, when crystallization time reaches half, the temperature of sand mold is made to reduce 10s, the temperature that sand mold reduces Degree is 4 DEG C;
Step 8: clear up casting, using the clear shell of waterpower or the clear shell of dry blast, using sawing machine cut-fill system, Blast is carried out using blowing machine;
Step 9: being heat-treated to casting.
The group of the molten aluminium alloy becomes:Silicon 12.5%, copper 3.5%, nickel 0.75%, magnesium 4.5%, zinc 8.5%, manganese 3.5%, titanium 1.1%, chromium 2.5%, europium 0.015%, holmium 0.004%, lutetium 0.015%, surplus is aluminium.
The specific preparation method of water-glass sand in the step 6 is:It chooses Foundry sand and is incorporated as into roughing sand The waterglass of its weight 7.5% is put into sand mixer and is uniformly mixed as adhesive later.
The step 6 is to carry out moulding using water-glass sand, and gas hole is then pricked on sand mold, which is from sand Type outer surface extends to the blind hole inside sand mold, then the protective cover sealed in the end face of sand mold, is arranged on the protective cover There is blow vent, mould surface is dried from the blow vent of protective cover to being passed through hot wind inside it, hot blast temperature is 180 DEG C, Wind speed is 6m/s, and time 20min removes protective cover later, and nitrogen is then passed through into the gas hole of sand mold, and air velocity is 6m/s, gas temperature are 27 DEG C, time 10s.
Heat treatment includes the following steps in the step 9:A, first stage homogenization heat treatment:Aluminium alloy castings are put Enter in heat-treatment heater, by room temperature to 245 DEG C of progress isothermal holdings, soaking time 40h;B, second stage is uniform Change heat treatment:It is continuously heating to 385 DEG C of progress isothermal holdings, soaking time 20h;C, phase III homogenization heat treatment:After It is continuous to be warming up to 500 DEG C of progress isothermal holdings, soaking time 15h;D, fourth stage homogenization heat treatment:It is continuously heating to 565 DEG C carry out isothermal holding, soaking time 1h;Finally casting is cooled to room temperature.
Preferably, in the step 7 when crystallization time reaches half, by making sand mold temperature drop to sand mold spray drying ice Low 4 DEG C.
In the step 7 when crystallization time reaches half, wind turbine can also be used to dry to sand mold, to make sand mold Temperature reduces by 4 DEG C.
Example the above is only the implementation of the present invention is not intended to limit the scope of the invention, every to utilize this hair Equivalent structure or equivalent flow shift made by bright description is applied directly or indirectly in other relevant technology necks Domain is included within the scope of the present invention.

Claims (10)

1. aluminum alloy die casting blank precise forming process, which is characterized in that include the following steps:
Step 1: according to the structure fabrication mold of casting, Casting shrinkage 0.5%-1.0%, pattern draft is 1 ' -3 ';
Step 2: suppress wax-pattern and sprue cup, cross gate, sprue and ingate using wax injector, and to wax-pattern repairing type, according to Constitutional diagram carries out wax module group type, then to the wax-pattern oil removing after combination;
Step 3: carrying out multilayer hanging sand to the wax-pattern for having organized type above;
Step 4: carrying out dewaxing process, formwork is no less than 20 hours under ventilation condition from dry after dewaxing, then formwork is placed on case Formula resistance kiln roasting, formwork cools to 450 DEG C or less taking-ups with the furnace after the completion of roasting, and formwork is examined after being cooled to room temperature;
Step 5: the formwork through washing must carry out drying shell process;
Step 6: carrying out moulding using water-glass sand, processing then is dried to sand mold;
Step 7: smelting aluminium alloy melt, is poured into a mould using pressure regulation, pouring temperature is 765-775 DEG C, and it is 350- to synchronize and build pressure 400KPa, liter hydraulic coupling are 5-10KPa, and liter liquid speed degree is 250-300mm/s, and mold filling pressure difference is 60-100KPa, filling velocity Make sand mold when crystallization time reaches half for 250-300mm/s, crystallization pressure 2-3KPa, crystallization time 200-250s Temperature reduce 5-10s, sand mold reduce temperature be 2-4 DEG C;
Step 8: clearing up casting, used using sawing machine cut-fill system using the clear shell of waterpower or the clear shell of dry blast Blowing machine carries out blast;
Step 9: being heat-treated to casting.
2. aluminum alloy die casting blank precise forming process as described in claim 1, which is characterized in that the step 5 It is middle dry shell process baking shell temperature be:380 DEG C, >=3 hours are kept the temperature, cast styling is sealed with paper with being furnace-cooled to after room temperature.
3. aluminum alloy die casting blank precise forming process as described in claim 1, which is characterized in that the dewaxing work Dewaxing parameter is in sequence:Outer courage steam pressure is 0.25-0.35MPa, and the dewaxing time is 11-12min, dewaxing temperature 135- 145℃。
4. aluminum alloy die casting blank precise forming process as described in claim 1, which is characterized in that the formwork is put It is roasted in chamber type electric resistance furnace, roasting parameter is:Furnace temperature formwork when 265-275 DEG C enters stove, then raises temperature to 790-820 DEG C, Heat preservation 2-3 hours, closes power supply after the completion.
5. aluminum alloy die casting blank precise forming process as described in claim 1, which is characterized in that the aluminium alloy The group of melt becomes:Silicon 9.5-12.5%, copper 2.5-3.5%, nickel 0.5-0.75%, magnesium 3.5-4.5%, zinc 7.5-8.5%, manganese 2.5-3.5%, titanium 0.9-1.1%, chromium 1.5-2.5%, europium 0.01-0.015%, holmium 0.002-0.004%, lutetium 0.01- 0.015%, surplus is aluminium.
6. aluminum alloy die casting blank precise forming process as described in claim 1, which is characterized in that the step 6 In the specific preparation method of water-glass sand be:It chooses Foundry sand and is incorporated as its weight 6.5%-7.5% into roughing sand Waterglass as adhesive, be put into later in sand mixer be uniformly mixed.
7. aluminum alloy die casting blank precise forming process as described in claim 1, which is characterized in that the step 6 To carry out moulding using water-glass sand, gas hole is then pricked on sand mold, which is to extend to sand mold from sand mold outer surface Internal blind hole, then the protective cover that is sealed in the end face of sand mold are provided with blow vent on the protective cover, from protective cover Blow vent is dried mould surface to being passed through hot wind inside it, and hot blast temperature is 150-180 DEG C, wind speed 5-6m/s, when Between be 15-20min, remove protective cover later, nitrogen, air velocity 5-6m/s, gas be then passed through into the gas hole of sand mold Temperature is 23-27 DEG C, time 5-10s.
8. aluminum alloy die casting blank precise forming process as described in claim 1, which is characterized in that the step 9 Middle heat treatment includes the following steps:A, first stage homogenization heat treatment:Aluminium alloy castings are put into heat-treatment heater, By room temperature to 235-245 DEG C of progress isothermal holding, soaking time 37-40h;B, second stage homogenization heat treatment:After It is continuous to be warming up to 355-385 DEG C of progress isothermal holding, soaking time 15-20h;C, phase III homogenization heat treatment:After of continuing rising Temperature to 480-500 DEG C progress isothermal holding, soaking time 10-15h;D, fourth stage homogenization heat treatment:It is continuously heating to 555-565 DEG C of progress isothermal holding, soaking time 0.5-1h;Finally casting is cooled to room temperature.
9. aluminum alloy die casting blank precise forming process as described in claim 1, which is characterized in that the step 7 In crystallization time reach half when, by sand mold spray drying ice make sand mold temperature reduce 2-4 DEG C.
10. aluminum alloy die casting blank precise forming process as described in claim 1, which is characterized in that the step In seven when crystallization time reaches half, dried to sand mold using wind turbine, to make sand mold temperature reduce 2-4 DEG C.
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