CN109628773A - A kind of method that refining is blown in low-pressure casting aluminium alloy melt argon gas protection rotation - Google Patents

A kind of method that refining is blown in low-pressure casting aluminium alloy melt argon gas protection rotation Download PDF

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Publication number
CN109628773A
CN109628773A CN201811604985.3A CN201811604985A CN109628773A CN 109628773 A CN109628773 A CN 109628773A CN 201811604985 A CN201811604985 A CN 201811604985A CN 109628773 A CN109628773 A CN 109628773A
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China
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refining
aluminium alloy
low
pressure casting
argon gas
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CN201811604985.3A
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Chinese (zh)
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薛祥义
张晓冬
何益可
周中波
杨国娟
林琳
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西安西工大超晶科技发展有限责任公司
沈阳飞机工业(集团)有限公司
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Priority to CN201811604985.3A priority Critical patent/CN109628773A/en
Publication of CN109628773A publication Critical patent/CN109628773A/en

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    • 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00Pressure casting; Vacuum casting
    • B22D18/04Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/05Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ

Abstract

Aluminium alloy material is carried out material by a kind of method that refining is blown in low-pressure casting aluminium alloy melt argon gas protection rotation;After to material, argon gas rotation is carried out to molten aluminum using purifier and blows refining, after the completion of refining, Al-alloy metal liquid is stood;Formwork moulding is to be cast;Casting is poured using the low-pressure casting equipment for being connected with air compressor by low-pressure casting technique.Solve the problems, such as that low pressure casting aluminum alloy melt content is larger, improve the consistency and bearing capacity of aluminium alloy, avoiding aluminium alloy, metallurgical quality occur unstable or even the case where scrap because melt air content is larger, ensure that being greatly lowered for castings production cost.Every 100g sample hydrogen content is less than 0.1mL after refining in the present invention, while reducing aluminium alloy melt air content, improves production efficiency.

Description

A kind of method that refining is blown in low-pressure casting aluminium alloy melt argon gas protection rotation

Technical field

The present invention relates to the methods that refining is blown in a kind of protection rotation of low-pressure casting aluminium alloy melt argon gas, and this method is adapted to low Pouring type is pressed, refining aluminium alloy melt is blown using argon gas rotation.

Background technique

With the rapid development of aerospace field, the production efficiency of performance and part to material requires higher and higher. Articles made of aluminium alloy is because its is light, corrosion resistance is good, tensile property is good, is easy and fast to the features such as Foundry Production, in recent years by more next More uses.Especially Al-Si alloy mechanical property with higher and it is easy to form the features such as, and volume stability Property it is excellent, be widely used in domestic various light duty engines at present.The life of domestic Al Alloy Castings with High Performance in recent years Produce mostly use anti-gravity pouring mode, antigravity casting using impressed pressure make molten metal along the direction opposite with gravity from Type and solidification forming are filled on down, type is steady, fill type controllable-rate, thermo parameters method rationally and is conducive to casting coagulates with filling Gu the characteristics of feeding, the mechanical castings produced are good, dense structure, casting flaw are few.But the melt of Al-Si alloy The formation for the defects of air content is higher, and the control of aluminium alloy melt air content avoids loose, stomata, is mingled with to casting has important Meaning, and directly affect the physical property, mechanical property and final service performance of aluminium casting.Country's aluminium alloy casting at present Part manufacturer majority is refined using chloride, but this refining route is often influenced by execute-in-place mode, and A large amount of poison gases can be generated in refining process, pollute environment, and equipment is corroded also than more serious.Therefore aluminium alloy melt is smart at this stage Refining mode is no longer satisfied the requirement of high metallurgical quality, high-performance aerospace aluminium alloy and environmental protection.

The high-purity argon cyclone quickly grown in recent years, which blows method of refining, has relatively good refining effect to aluminium alloy melt, And nonstaining property, production process are easily operated, refining effect is stable, have been obtained and are widely applied.Its principle is mainly Rotatable gas tip is set among refining molten bath, sprays refinery gas by rotary nozzle, forms tiny bubble, And by the agitation of rotor, it is evenly distributed to bubble among entire molten bath, to obtain preferable refining effect.But aluminium closes Golden melt air content will receive the influence of the factors such as raw material, melting material process, refinery practice parameter and process, especially work as When aluminium alloy uses anti-gravity pouring mode, need to carry out pressurising, pressure maintaining using compressed air to molten metal upper end to form pressure Difference and metallic pressure coagulating environment inevitably bring a part of wet air into and improve aluminium alloy melt content.Aluminium The unstable of each factor can all cause refining effect difference occur in alloy refining process.The increasing of aluminium alloy castings air content Add, will lead to aluminium alloy pin hole, loose and shrinkage cavity the formation of induction, reduce the metallurgical quality of aluminium alloy, to its mechanical property and Bearing capacity has significant impact.It therefore is high-performance, high-densit at this stage there is an urgent need to find a kind of reasonable method Property, high metallurgical quality aluminium alloy low-pressure casting castings production provide solid foundation.

Summary of the invention

To overcome the problems of the prior art, the purpose of the present invention is to provide a kind of low-pressure casting aluminium alloy melt argon gas The method that refining is blown in protection rotation.

To achieve the above object, the technical solution adopted by the present invention are as follows:

A kind of method that refining is blown in low-pressure casting aluminium alloy melt argon gas protection rotation, comprising the following steps:

Step 1: aluminium alloy material is subjected to material;

Step 2: after to material, argon gas rotation being carried out to molten aluminum using purifier and blows refining, refining is blown in argon gas rotation Technological parameter is as follows: revolving speed 300r/min, and ventilatory capacity is 0.4~0.6m3/ h, 710~720 DEG C of refining temperature, refining time For 15min;

Step 3: after the completion of refining, Al-alloy metal liquid being stood;

Step 4: formwork moulding is to be cast;

Step 5: casting is poured using the low-pressure casting equipment for being connected with air compressor by low-pressure casting technique, Wherein, the parameter of low-pressure casting technique are as follows: mold temperature: room temperature, pouring temperature: 730~740 DEG C, liter liquid, the speed for filling type are equal Are as follows: 50~150mm/s, freezing pressure are poor: 25~45KPa;

Step 6: 5 medium casting surface formwork of cleanup step cuts off dead head, cast(ing) surface burr of polishing.

A further improvement of the present invention lies in that by alloy material carry out material before, by aluminium alloy material surface through overdrying blast at Reason, then in 450 DEG C of baking 1h.

A further improvement of the present invention lies in that in step 1, the detailed process of material are as follows: baking is added in graphite crucible Aluminium alloy material afterwards covers mouth of pot using bell jar during material, will by the argon inlet mouth of bell jar upper end center Argon gas is passed through in graphite crucible.

A further improvement of the present invention lies in that argon inlet mouth is higher than graphite crucible upper end 5cm.

A further improvement of the present invention lies in that purifier includes graphite bars in step 2, offered along graphite rod axis Venthole, and the diameter of venthole is 14mm, and graphite bars bottom end offers 9 and is circumferentially uniformly distributed venthole along graphite bars.

A further improvement of the present invention lies in that the diameter of venthole is 3mm.

A further improvement of the present invention lies in that the side of graphite bars is vertically arranged with a baffle, baffle is apart from graphite plate Longitudinal center line distance be 6cm, baffle bottom end be higher than graphite bars bottom end 20cm.

A further improvement of the present invention lies in that carrying out taking off Slag treatment in refining process in step 2.

A further improvement of the present invention lies in that air compressor outlet is connected through dry degasifier device with air accumulator, store up Gas tank is connected through oil water separator with low-pressure casting equipment.

Compared with prior art, the device have the advantages that are as follows:

The present invention is by carrying out material for aluminium alloy material;After to material, argon gas is carried out to molten aluminum using purifier Refining is blown in rotation, and after the completion of refining, Al-alloy metal liquid is stood;Formwork moulding is to be cast;Casting uses and is connected with compressed air The low-pressure casting equipment of machine is poured by low-pressure casting technique.Refinery practice and pouring technology in through the invention, It solves the problems, such as that low pressure casting aluminum alloy melt content is larger, improves the consistency and bearing capacity of aluminium alloy, avoid Metallurgical quality occur unstable or even the case where scrap because melt air content is larger for aluminium alloy, ensure that castings production cost It is greatly lowered.Every 100g sample hydrogen content is less than 0.1mL after refining in the present invention, is reducing the same of aluminium alloy melt air content When, improve production efficiency.

Further, baking raw material not only can sufficiently reduce the adsorbed gas content of raw material, Er Qieke to 450 DEG C To substantially reduce the material time, material efficiency is improved, reduces the inspiratory duration of aluminium alloy during material.

Further, purifier production is simple, can completely cut off contact of the aluminium alloy melt with air, and it is molten to reduce aluminium alloy Oxide slag inclusion and air-breathing of the body during material.

Further, installation is filled with desiccant degasification among the air compressor of low-pressure casting equipment and air accumulator It sets, oil water separator is installed among air accumulator and low-pressure casting machine, guarantee air by the generation in air compressor to low It is dry gas after pressure casting equipment;The double-deck measure guarantees be poured to reduce the air content of the pressurized gas of anti-gravity pouring The possibility of air-breathing is not present in aluminium alloy melt in the process.

Detailed description of the invention

Fig. 1 is the schematic diagram of graphite bars in the present invention.

In figure, 1 is venthole, and 2 be venthole, and 3 be graphite bars.

Specific embodiment

Now in conjunction with embodiment, present invention is further described in detail:

Based on certain aviation shell product, using aluminium alloy in the melting of 150Kg resistance melting furnace as research object, first The clean level and roasting mode of strict control raw material;Design simple melting argon protective device;It is designed according to casting structure Running gate system;Determine that equipment and technology work-in parameters are blown in optimal argon gas rotation;Refine refining process;Simple reformation low-pressure casting into Device of air;Molten metal before being poured is carried out to survey hydrogen detection;Ray detection metallurgical quality of cast;Low power detects casting pin hole grade; Carry out bulge test.

The present invention the following steps are included:

Step 1: aluminium alloy material surface has to pass through dry blast processing, and then aluminium alloy material is stand-by after 450 DEG C of baking 1h;

Step 2: the aluminium alloy material after step 1 baking is added in 150Kg graphite crucible uses clock during material The cover lives mouth of pot, and argon gas is passed through in aluminium alloy crucible at bell jar upper end center position, and argon inlet mouth need to be higher than on crucible Hold 5cm;

Step 3: improving argon gas rotation and blow purifier, the structure of purifier are as follows: referring to Fig. 1, opened up along 3 axis of graphite bars There is a venthole 2, and the diameter of venthole 2 is 14mm, graphite bars bottom end offers 9 and is circumferentially uniformly distributed along graphite bars and directly Diameter is the venthole 1 of 3mm;The side of graphite bars 3 is provided with a baffle, longitudinal center line of the baffle apart from graphite plate 3 away from From for 6cm, baffle bottom end is higher than graphite bars bottom end 20cm, it is therefore an objective to allow vortex more evenly;

Step 4: after to material, argon gas rotation being carried out to molten aluminum and blows refining, technological parameter is as follows: revolving speed 300r/ Min, ventilatory capacity are 0.4~0.6m3/ h, 710~720 DEG C of refining temperature, refining time 15min;In ventilatory capacity and step 3 The venthole 1 that 9 diameters are 3mm matches, and is conducive to improve the metallurgical quality of aluminium alloy castings in this way, and improve aluminium alloy Consistency and then the bearing capacity for increasing aluminium alloy, play the mechanical property advantage of aluminium alloy as far as possible.

Step 5: needing to carry out taking off Slag treatment always in refining process;

Step 6: making following improvement for low-pressure casting equipment: being added 1., among air compressor and air accumulator dry Dry degasifier device;2., among air accumulator and low-pressure casting equipment add oil water separator.

Step 7: after the completion of refining, Al-alloy metal liquid need to stand 10min, complete to survey hydrogen detection.

Step 8: formwork moulding is to be cast.

Step 9: casting is poured by being connected with the low-pressure casting equipment of air compressor using low-pressure casting technique, Wherein, mold temperature: room temperature, pouring temperature: 730~740 DEG C, liter liquid, the speed for filling type are equal are as follows: 100mm/s, freezing pressure Difference: 40KPa.

Step 10: 9 medium casting surface formwork of cleanup step cuts off dead head, polishing cast(ing) surface burr etc..

Step 11: X-ray detection being carried out to step 10 medium casting, low power detection is completed and suppresses experiment.

It is below specific embodiment.

Embodiment 1

By taking size 560 × 245 × 190mm casting as an example, material ZL114A shares 11 oil-way pipes, and boss is more, shape Shape is different, and using 3D printing sand mold+low-pressure casting mode, institute's sub-sand type block is more, and specific step is as follows for implementation:

Step 1: aluminium alloy has to pass through dry blast using material surface and handles, stand-by after 450 DEG C of baking 1h using material.

Step 2: the aluminium alloy material that step 1 baking is completed being added in 150Kg graphite crucible, is used during material Bell jar covers mouth of pot, and argon gas is passed through in aluminium alloy crucible at bell jar upper end center position, and argon inlet mouth need to be higher than crucible Upper end 5cm.

Step 3: improving argon gas rotation and blow purifier, purifier improves structure: offering venthole along 3 axis of graphite bars 2, and the diameter of venthole 2 be 14mm, graphite bars bottom end offer 9 be circumferentially uniformly distributed along graphite bars and diameter be 3mm Venthole 1;The side of graphite bars 3 is provided with a baffle, and the distance of longitudinal center line of the baffle apart from graphite plate 3 is 6cm, Baffle bottom end is higher than graphite bars bottom end 20cm, it is therefore an objective to allow and be vortexed more evenly;

Step 4: after to material, argon gas rotation is carried out to molten aluminum and blows refining, technological parameter is as follows: revolving speed 300r/min, 0.4~0.6m of ventilatory capacity3/ h, refines 15 time min by 715 ± 5 DEG C of refining temperature.

Step 5: needing to carry out taking off Slag treatment always in refining process.

Step 6: making following improvement for low-pressure casting equipment: being added 1., among air compressor and air accumulator dry Dry degasifier device;2., among air accumulator and low-pressure casting equipment add oil water separator.

Step 7: after the completion of refining, Al-alloy metal liquid need to stand 10min, complete to survey hydrogen detection.

It is to be cast that step 8:3D prints sand mold block mould assembly.

Step 9: casting is poured by being connected with the low-pressure casting equipment of air compressor using low-pressure casting technique, Mold temperature: room temperature, pouring temperature: 735~745 DEG C, liter liquid, the speed for filling type are equal are as follows: 50mm/s, freezing pressure are poor: 38KPa。

Step: 10: 9 medium casting surface sand mold of cleanup step cuts off dead head, polishing cast(ing) surface burr etc..

Step 11: X-ray detection being carried out to step 10 medium casting, low power detection is completed and suppresses experiment.

Alloy refining processing is carried out in this way, is surveyed among hydrogen sample and there are pit and is collapsed, sample refining Every 100g sample hydrogen content is 0.08mL afterwards, is shown inside sample without gas overflowing;Casting is through X-ray detection internal metallurgical quality Reach I class casting standard of HB963, by macroscopic test test pin hole grade less than 1 grade, being suppressed test 4mm thickness oil-way pipe can Pressure-bearing 0.8MPa.

Embodiment 2

With 150 × 130 × 57mm of size, for whole wall thickness 8mm casting, material ZL105, there are two to hold liquid for casting Pressure passageway, specific step is as follows for implementation:

Step 1: aluminium alloy has to pass through dry blast using material surface and handles, stand-by after 450 DEG C of baking 1h using material.

Step 2: the aluminium alloy material that step 1 baking is completed being added in 150Kg graphite crucible, is used during material Bell jar covers mouth of pot, and argon gas is passed through in aluminium alloy crucible at bell jar upper end center position, and argon inlet mouth need to be higher than crucible Upper end 5cm.

Step 3: improving argon gas rotation and blow purifier, purifier improves structure: offering venthole along 3 axis of graphite bars 2, and the diameter of venthole 2 be 14mm, graphite bars bottom end offer 9 be circumferentially uniformly distributed along graphite bars and diameter be 3mm Venthole 1;The side of graphite bars 3 is provided with a baffle, and the distance of longitudinal center line of the baffle apart from graphite plate 3 is 6cm, Baffle bottom end is higher than graphite bars bottom end 20cm, it is therefore an objective to allow and be vortexed more evenly;

Step 4: after to material, argon gas rotation is carried out to molten aluminum and blows refining, technological parameter is as follows: revolving speed 300r/min, 0.4~0.6m of ventilatory capacity3/ h, 715 ± 5 DEG C of refining temperature, refining time 15min.

Step 5: needing to carry out taking off Slag treatment always in refining process.

Step 6: making following improvement for low-pressure casting equipment: being added 1., among air compressor and air accumulator dry Dry degasifier device;2., among air accumulator and low-pressure casting equipment add oil water separator.

Step 7: after the completion of refining, Al-alloy metal liquid need to stand 10min, complete to survey hydrogen detection.

Step 8: formwork moulding is to be cast.

Step 9: casting is poured by being connected with the low-pressure casting equipment of air compressor using low-pressure casting technique, Mold temperature: room temperature, pouring temperature: 725~735 DEG C, liter liquid, the speed for filling type are equal are as follows: 80mm/s, freezing pressure are poor: 35KPa。

Step: 10: 9 medium casting surface formwork of cleanup step cuts off dead head, polishing cast(ing) surface burr etc..

Step 11: X-ray detection being carried out to step 10 medium casting, low power detection is completed and suppresses experiment.

Alloy refining processing is carried out in this way, surveys among hydrogen sample that there are pits to be collapsed, it is every after sample refining 100g sample hydrogen content is 0.07mL;Casting reaches I class casting standard of HB963 through X-ray detection internal metallurgical quality, through too low Less than 1 grade, hydraulic 0.8MPa can be held by being suppressed test 8mm thickness oil-way pipe for times experimental test pin hole grade.

Embodiment 3

With sizeFor whole wall thickness 16mm casting, material ZL114A, casting is in peviform, Radian is larger, and inner cavity is hollow.Specific step is as follows for its implementation:

Step 1: aluminium alloy has to pass through dry blast using material surface and handles, stand-by after 450 DEG C of baking 1h using material.

Step 2: the aluminium alloy material that step 1 baking is completed being added in 150Kg graphite crucible, is used during material Bell jar covers mouth of pot, and argon gas is passed through in aluminium alloy crucible at bell jar upper end center position, and argon inlet mouth need to be higher than crucible Upper end 5cm.

Step 3: improving argon gas rotation and blow purifier, purifier improves structure: offering venthole along 3 axis of graphite bars 2, and the diameter of venthole 2 be 14mm, graphite bars bottom end offer 9 be circumferentially uniformly distributed along graphite bars and diameter be 3mm Venthole 1;The side of graphite bars 3 is provided with a baffle, and the distance of longitudinal center line of the baffle apart from graphite plate 3 is 6cm, Baffle bottom end is higher than graphite bars bottom end 20cm, it is therefore an objective to allow and be vortexed more evenly;

Step 4: after to material, argon gas rotation is carried out to molten aluminum and blows refining, technological parameter is as follows: revolving speed 300r/min, 0.4~0.6m of ventilatory capacity3/ h, 715 ± 5 DEG C of refining temperature, refining time 15min.

Step 5: needing to carry out taking off Slag treatment always in refining process.

Step 6: making following improvement for low-pressure casting equipment: being added 1., among air compressor and air accumulator dry Dry degasifier device;2., among air accumulator and low-pressure casting equipment add oil water separator.

Step 7: after the completion of refining, Al-alloy metal liquid need to stand 10min, complete to survey hydrogen detection.

Step 8: formwork moulding is to be cast.

Step 9: casting is poured by being connected with the low-pressure casting equipment of air compressor using low-pressure casting technique, Mold temperature: room temperature, pouring temperature: 735~740 DEG C, liter liquid, the speed for filling type are equal are as follows: 100mm/s, freezing pressure are poor: 45KPa。

Step 10: 9 medium casting surface formwork of cleanup step cuts off dead head, polishing cast(ing) surface burr etc..

Step 11: X-ray detection being carried out to step 10 medium casting, low power detection is completed and suppresses experiment.

Alloy refining processing is carried out in this way, surveys among hydrogen sample that there are pits to be collapsed, it is every after sample refining 100g sample hydrogen content is 0.09mL;Casting reaches I class casting standard of HB963 through X-ray detection internal metallurgical quality, through too low Times experimental test pin hole grade is tested, 4mm thickness oil-way pipe can hold air pressure 0.9MPa less than 1 grade through air-flow.

Embodiment 4

With sizeFor casting, material ZL205A, casting is in tubbiness, and casting is whole Wall thickness is 18mm, and central hollow, specific step is as follows for implementation:

Step 1: aluminium alloy has to pass through dry blast using material surface and handles, stand-by after 450 DEG C of baking 1h using material.

Step 2: the aluminium alloy material that step 1 baking is completed being added in 150Kg graphite crucible, is used during material Bell jar covers mouth of pot, and argon gas is passed through in aluminium alloy crucible at bell jar upper end center position, and argon inlet mouth need to be higher than crucible Upper end 5cm.

Step 3: improving argon gas rotation and blow purifier, purifier improves structure: offering venthole along 3 axis of graphite bars 2, and the diameter of venthole 2 be 14mm, graphite bars bottom end offer 9 be circumferentially uniformly distributed along graphite bars and diameter be 3mm Venthole 1;The side of graphite bars 3 is provided with a baffle, and the distance of longitudinal center line of the baffle apart from graphite plate 3 is 6cm, Baffle bottom end is higher than graphite bars bottom end 20cm, it is therefore an objective to allow and be vortexed more evenly;

Step 4: after to material, argon gas rotation is carried out to molten aluminum and blows refining, technological parameter is as follows: revolving speed 300r/min, 0.4~0.6m of ventilatory capacity3/ h, 715 ± 5 DEG C of refining temperature, refining time 15min.

Step 5: needing to carry out taking off Slag treatment always in refining process.

Step 6: making following improvement for low-pressure casting equipment: being added 1., among air compressor and air accumulator dry Dry degasifier device;2., among air accumulator and low-pressure casting equipment add oil water separator.

Step 7: after the completion of refining, Al-alloy metal liquid need to stand 10min, complete to survey hydrogen detection.

Step 8: formwork moulding is to be cast.

Step 9: casting is poured by being connected with the low-pressure casting equipment of air compressor using low-pressure casting technique, Mold temperature: room temperature, pouring temperature: 735~740 DEG C, liter liquid, the speed for filling type are equal are as follows: 100mm/s, freezing pressure are poor: 45KPa。

Step 10: 9 medium casting surface formwork of cleanup step cuts off dead head, polishing cast(ing) surface burr etc..

Step 11: X-ray detection being carried out to step 10 medium casting, completes low power detection.

Alloy refining processing is carried out in this way, surveys among hydrogen sample that there are pits to be collapsed, it is every after sample refining 100g sample hydrogen content is 0.06mL;Casting reaches II class casting standard of HB963 through X-ray detection internal metallurgical quality, passes through Macroscopic test tests pin hole grade less than 1 grade.

For preparing different aluminium alloys, as the case may be, rises liquid, fills the speed of type within the scope of 50~150mm/s, Freezing pressure difference is within the scope of 25~45KPa.

The present invention designs new raw material of aluminum alloy smelting technology from the details control in production process, passes through this The refinery practice and pouring technology in purifier and the present invention in invention, solves low pressure casting aluminum alloy melt and contains Larger problem is measured, the consistency and bearing capacity of aluminium alloy are improved, aluminium alloy is avoided and goes out because melt air content is larger The case where existing metallurgical quality is unstable or even scraps, ensure that being greatly lowered for castings production cost.After being refined in the present invention Every 100g sample hydrogen content is less than 0.1mL, while reducing aluminium alloy melt air content, improves production efficiency.

Claims (9)

1. a kind of method that refining is blown in low-pressure casting aluminium alloy melt argon gas protection rotation, which comprises the following steps:
Step 1: aluminium alloy material is subjected to material;
Step 2: after to material, argon gas rotation being carried out to molten aluminum using purifier and blows refining, argon gas revolves the technique for blowing refining Parameter is as follows: revolving speed 300r/min, and ventilatory capacity is 0.4~0.6m3/ h, 710~720 DEG C of refining temperature, refining time is 15min;
Step 3: after the completion of refining, Al-alloy metal liquid being stood;
Step 4: formwork moulding is to be cast;
Step 5: casting is poured using the low-pressure casting equipment for being connected with air compressor by low-pressure casting technique, In, the parameter of low-pressure casting technique are as follows: mold temperature: room temperature, pouring temperature: 730~740 DEG C, liter liquid, the speed for filling type are equal Are as follows: 50~150mm/s, freezing pressure are poor: 25~45KPa;
Step 6: 5 medium casting surface formwork of cleanup step cuts off dead head, cast(ing) surface burr of polishing.
2. the method that refining is blown in a kind of low-pressure casting aluminium alloy melt argon gas protection rotation according to claim 1, feature It is, before alloy material is carried out material, aluminium alloy material surface is handled through overdrying blast, then in 450 DEG C of baking 1h.
3. the method that refining is blown in a kind of low-pressure casting aluminium alloy melt argon gas protection rotation according to claim 2, feature It is, in step 1, the detailed process of material are as follows: the aluminium alloy material after baking is added in graphite crucible, during material Mouth of pot is covered using bell jar, argon gas is passed through in graphite crucible by the argon inlet mouth of bell jar upper end center.
4. the method that refining is blown in a kind of low-pressure casting aluminium alloy melt argon gas protection rotation according to claim 3, feature It is, argon inlet mouth is higher than graphite crucible upper end 5cm.
5. the method that refining is blown in a kind of low-pressure casting aluminium alloy melt argon gas protection rotation according to claim 1, feature It is, in step 2, purifier includes graphite bars (3), and along graphite bars (3), axis is offered venthole (2), and venthole (2) diameter is 14mm, and graphite bars bottom end offers 9 and is circumferentially uniformly distributed venthole (1) along graphite bars.
6. the method that refining is blown in a kind of low-pressure casting aluminium alloy melt argon gas protection rotation according to claim 5, feature It is, the diameter of venthole (1) is 3mm.
7. the method that refining is blown in a kind of low-pressure casting aluminium alloy melt argon gas protection rotation according to claim 5, feature It is, the side of graphite bars (3) is vertically arranged with a baffle, and the distance of longitudinal center line of the baffle apart from graphite plate (3) is 6cm, baffle bottom end are higher than graphite bars bottom end 20cm.
8. the method that refining is blown in a kind of low-pressure casting aluminium alloy melt argon gas protection rotation according to claim 1, feature It is, in step 2, carries out taking off Slag treatment in refining process.
9. the method that refining is blown in a kind of low-pressure casting aluminium alloy melt argon gas protection rotation according to claim 1, feature It is, air compressor outlet is connected through dry degasifier device with air accumulator, and air accumulator is through oil water separator and low-pressure casting Equipment is connected.
CN201811604985.3A 2018-12-26 2018-12-26 A kind of method that refining is blown in low-pressure casting aluminium alloy melt argon gas protection rotation CN109628773A (en)

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CN106216636A (en) * 2016-08-26 2016-12-14 中国船舶重工集团公司第七二五研究所 A kind of AlMg3 aluminium alloy tip arrester low-pressure casting method
CN106925756A (en) * 2017-02-23 2017-07-07 中国第汽车股份有限公司 A kind of low-pressure casting preparation method of aluminum alloy auxiliary vehicle frame

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CN105364048A (en) * 2015-12-02 2016-03-02 衢州学院 Manufacture method of connecting rod of air compressor
CN106216636A (en) * 2016-08-26 2016-12-14 中国船舶重工集团公司第七二五研究所 A kind of AlMg3 aluminium alloy tip arrester low-pressure casting method
CN106925756A (en) * 2017-02-23 2017-07-07 中国第汽车股份有限公司 A kind of low-pressure casting preparation method of aluminum alloy auxiliary vehicle frame

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