CN104878252A - Method for casting thin-walled aluminum alloy castings - Google Patents

Method for casting thin-walled aluminum alloy castings Download PDF

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Publication number
CN104878252A
CN104878252A CN201510258740.XA CN201510258740A CN104878252A CN 104878252 A CN104878252 A CN 104878252A CN 201510258740 A CN201510258740 A CN 201510258740A CN 104878252 A CN104878252 A CN 104878252A
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carry
thin
temperature
component
aluminium
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CN201510258740.XA
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谭皓原
谭科文
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Field Machinery Co Ltd Of Liuzhou City Hundred
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Field Machinery Co Ltd Of Liuzhou City Hundred
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Priority to CN201510258740.XA priority Critical patent/CN104878252A/en
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Abstract

The invention discloses a method for casting thin-walled aluminum alloy castings, which relates to the technical field of aluminum alloy manufacturing. The method comprises the following steps: respectively drying each component of an aluminum alloy; preheating a crucible so as to melt aluminum ingots, adding the other components in molten aluminum, and smelting the obtained mixture; after slag removal is performed, refining the obtained object at a temperature of 770-780 DEG C, carrying out heat preservation for 3-8 minutes, and standing for 10-15 minutes; carrying out drossing and degassing on the obtained object, and at a temperature of 730-740 DEG C, after dross is removed, carrying out heat-preserved standing for 20-30 minutes; pushing off slags in the process of pouring under the conditions that the pouring temperature is 720-750 DEG C, the mold-filling pressure difference is 50-80 KPa and the mold-filling velocity is 250-280mm/s, and after the obtained object is cooled with a mold, carrying out mold opening, so that a casting is obtained; and carrying out solid-solution treatment and aging treatment on the casting, taking the casting out of a furnace, and carrying out air cooling on the casting. The method disclosed by the invention solves the problem that existing complex-shaped thin-walled aluminum alloy castings are poor in molding quality, low in strength and easy to deform.

Description

The castmethod of thin-walled aluminium alloy castings
Technical field
The present invention relates to aluminum alloy technology for making field, especially a kind of castmethod of thin-walled aluminium alloy castings.
Background technology
Aluminium alloy is common lightweight metal material, it is widely used in the industry such as automobile, boats and ships, space flight, machinery, communication, it has the features such as good processability, quality be light, and along with lightweight and the low consumed requirement of the energy, the demand of aluminium alloy constantly expands.At present, it is shaping that aluminum alloy thin wall pieces adopts castmethod to manufacture mostly, and because casting is relative to other processing mode, its using rate of metal is high, and dimensional precision is high, can produce complex-shaped parts, has excellent mechanical property and physicals.Along with the fast development of the industry such as space flight, automobile, the performance of aluminum alloy thin wall pieces is had higher requirement.And existing thin-walled aluminium alloy castings is when casting, mobility is slightly poor, easily occurs pore, shrinkage porosite, and the forming quality of complex-shaped thin-wall part is poor, and intensity is lower, yielding, is difficult to the service requirements meeting thin-wall part.
Summary of the invention
The object of this invention is to provide a kind of castmethod of thin-walled aluminium alloy castings, it can solve, and existing complex-shaped thin-walled aluminium alloy castings forming quality is poor, intensity is lower and yielding problem.
In order to solve the problem, the technical solution used in the present invention is: a kind of castmethod of thin-walled aluminium alloy castings, and the aluminium alloy of this foundry goods is made up of the component of following weight percentage: Si0.42-0.66%, Cu2.3-2.5%, Fe≤0.3%, Zn2-3%, Mn3-4%, Mg2.8-5.5%, Ti0. 5-0.8%, Sr0.01-0.02%, Cr≤0.15%, Y0.5-0.7%, V0.2-0.5%, Re0.1-0.3%, other impurity gross weight is less than 0.15%, and surplus is Al;
Castmethod is as follows:
A, by said components and mass percentage batching, then each component is dried respectively;
B, crucible is preheating to 280-320 DEG C, aluminium ingot is fused into aluminium liquid, then in aluminium liquid, adds other component and carry out melting, temperature controls as 740-770 DEG C;
After C, slagging-off, carry out refining at 770-780 DEG C, insulation 3-8 minute, leaves standstill 10-15 minute after refining;
D, then carry out skimming, degassed, temperature controls as 730-740 DEG C, and except after removing dross, insulation leaves standstill 20-30 minute;
Pushing off the slag when E, cast, teeming temperature 720-750 DEG C, mold filling pressure difference is 50-80KPa, and filling velocity is 250-280mm/s, and after mould cooling, die sinking, obtains foundry goods;
F, carry out solution treatment to foundry goods, treatment temp is 530-550 DEG C, and insulation 12-15 hour, then cools in the water of 50-80 DEG C;
G, carry out ageing treatment subsequently, aging temperature is 160-170 DEG C, is incubated 6 hours, air cooling of coming out of the stove.
In the technical scheme of the castmethod of above-mentioned thin-walled aluminium alloy castings, technical scheme can also be more specifically: Si0.58%, Cu2.42%, Fe0.16%, Zn2.2%, Mn3.5%, Mg4.2%, Ti0.6%, Sr0.015%, Cr0.1%, Y0.65%, V0.35%, Re0.25%.
Further, in step B, the temperature of fusion of aluminium is 750-760 DEG C, is incubated 6-10 minute and adds other component again after being fused into aluminium liquid.
Owing to have employed technique scheme, the present invention compared with prior art has following beneficial effect: carry out modification by optimized alloy composition and proportioning, improve mechanical property and the physicals of aluminium alloy, the good fluidity of alloy material, be applicable to the thin-wall part that casting is complex-shaped, forming quality is good, and not yielding tensile strength is greater than 460MPa, and unit elongation is greater than 7%; The adjustment of technique and the optimization of parameter, can improve the forming quality of foundry goods, and thermal treatment makes foundry goods mechanical property more stable.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail:
Embodiment 1
The aluminium alloy of the thin-walled aluminium alloy castings of the present embodiment is made up of the component of following weight percentage: Si0.42%, Cu2.5%, Fe0.3%, Zn2%, Mn4%, Mg2.8%, Ti0. 5%, Sr0.01%, Cr0.15%, Y0.5%, V0.2%, Re0.1%, other impurity gross weight is less than 0.15%, and surplus is Al;
Castmethod is as follows:
A, by said components and mass percentage batching, then each component is dried respectively;
B, crucible is preheating to 280 DEG C, aluminium ingot is fused into aluminium liquid under the condition of 750 DEG C, is incubated 6 minutes, then in aluminium liquid, adds other component and carry out melting, temperature controls as 740-750 DEG C;
After C, slagging-off, carry out refining at 770-780 DEG C, be incubated 3 minutes, after refining, leave standstill 10 minutes;
D, then carry out skimming, degassed, temperature controls as 730-740 DEG C, and except after removing dross, insulation leaves standstill 20 minutes;
Pushing off the slag when E, cast, teeming temperature 720-730 DEG C, mold filling pressure difference is 50KPa, and filling velocity is 250mm/s, and after mould cooling, die sinking, obtains foundry goods;
F, carry out solution treatment to foundry goods, treatment temp is 530 DEG C, is incubated 15 hours, then cools in the water of 50 DEG C;
G, carry out ageing treatment subsequently, aging temperature is 160 DEG C, is incubated 6 hours, air cooling of coming out of the stove.
The performance of the thin-walled aluminium alloy castings that the present embodiment obtains is as follows: tensile strength is 462MPa, unit elongation 7.3%.
Embodiment 2
The aluminium alloy of the thin-walled aluminium alloy castings of embodiment is made up of the component of following weight percentage: Si0.58%, Cu2.42%, Fe0.16%, Zn2.2%, Mn3.5%, Mg4.2%, Ti0.6%, Sr0.015%, Cr0.1%, Y0.65%, V0.35%, Re0.25%, other impurity gross weight is less than 0.15%, and surplus is Al;
Castmethod is as follows:
A, by said components and mass percentage batching, then each component is dried respectively;
B, crucible is preheating to 300 DEG C, aluminium ingot is fused into aluminium liquid under the condition of 760 DEG C, is incubated 10 minutes, then in aluminium liquid, adds other component and carry out melting, temperature controls as 750-760 DEG C;
After C, slagging-off, carry out refining at 770-780 DEG C, be incubated 8 minutes, after refining, leave standstill 12 minutes;
D, then carry out skimming, degassed, temperature controls as 730-740 DEG C, and except after removing dross, insulation leaves standstill 25 minutes;
Pushing off the slag when E, cast, teeming temperature 730-740 DEG C, mold filling pressure difference is 80KPa, and filling velocity is 280mm/s, and after mould cooling, die sinking, obtains foundry goods;
F, carry out solution treatment to foundry goods, treatment temp is 540 DEG C, is incubated 13 hours, then cools in the water of 65 DEG C;
G, carry out ageing treatment subsequently, aging temperature is 170 DEG C, is incubated 6 hours, air cooling of coming out of the stove.
The performance of the thin-walled aluminium alloy castings that the present embodiment obtains is as follows: tensile strength is 481MPa, unit elongation 8.2%.
Embodiment 3
The aluminium alloy of the thin-walled aluminium alloy castings of the present embodiment is made up of the component of following weight percentage: Si0.66%, Cu2.3%, Fe0.12%, Zn3%, Mn3%, Mg5.5%, Ti0.8%, Sr0.02%, Cr0.1%, Y0.7%, V0.5%, Re0.3%, other impurity gross weight is less than 0.15%, and surplus is Al;
Castmethod is as follows:
A, by said components and mass percentage batching, then each component is dried respectively;
B, crucible is preheating to 320 DEG C, aluminium ingot is fused into aluminium liquid under the condition of 755 DEG C, is incubated 8 minutes, then in aluminium liquid, adds other component and carry out melting, temperature controls as 760-770 DEG C;
After C, slagging-off, carry out refining at 770-780 DEG C, be incubated 5 minutes, after refining, leave standstill 15 minutes;
D, then carry out skimming, degassed, temperature controls as 730-740 DEG C, and except after removing dross, insulation leaves standstill 30 minutes;
Pushing off the slag when E, cast, teeming temperature 740-750 DEG C, mold filling pressure difference is 70KPa, and filling velocity is 260mm/s, and after mould cooling, die sinking, obtains foundry goods;
F, carry out solution treatment to foundry goods, treatment temp is 550 DEG C, is incubated 12 hours, then cools in the water of 50-80 DEG C;
G, carry out ageing treatment subsequently, aging temperature is 165 DEG C, is incubated 6 hours, air cooling of coming out of the stove.
The performance of the thin-walled aluminium alloy castings that the present embodiment obtains is as follows: tensile strength is 483MPa, unit elongation 7.1%.

Claims (3)

1. a castmethod for thin-walled aluminium alloy castings, is characterized in that the aluminium alloy of this foundry goods is made up of the component of following weight percentage: Si0.42-0.66%, Cu2.3-2.5%, Fe≤0.3%, Zn2-3%, Mn3-4%, Mg2.8-5.5%, Ti0. 5-0.8%, Sr0.01-0.02%, Cr≤0.15%, Y0.5-0.7%, V0.2-0.5%, Re0.1-0.3%, other impurity gross weight is less than 0.15%, and surplus is Al;
Castmethod is as follows:
A, by said components and mass percentage batching, then each component is dried respectively;
B, crucible is preheating to 280-320 DEG C, aluminium ingot is fused into aluminium liquid, then in aluminium liquid, adds other component and carry out melting, temperature controls as 740-770 DEG C;
After C, slagging-off, carry out refining at 770-780 DEG C, insulation 3-8 minute, leaves standstill 10-15 minute after refining;
D, then carry out skimming, degassed, temperature controls as 730-740 DEG C, and except after removing dross, insulation leaves standstill 20-30 minute;
Pushing off the slag when E, cast, teeming temperature 720-750 DEG C, mold filling pressure difference is 50-80KPa, and filling velocity is 250-280mm/s, and after mould cooling, die sinking, obtains foundry goods;
F, carry out solution treatment to foundry goods, treatment temp is 530-550 DEG C, and insulation 12-15 hour, then cools in the water of 50-80 DEG C;
G, carry out ageing treatment subsequently, aging temperature is 160-170 DEG C, is incubated 6 hours, air cooling of coming out of the stove.
2. the castmethod of thin-walled aluminium alloy castings according to claim 1, is characterized in that: Si0.58%, Cu2.42%, Fe0.16%, Zn2.2%, Mn3.5%, Mg4.2%, Ti0.6%, Sr0.015%, Cr0.1%, Y0.65%, V0.35%, Re0.25%.
3. the castmethod of thin-walled aluminium alloy castings according to claim 1 and 2, is characterized in that: in step B, the temperature of fusion of aluminium is 750-760 DEG C, is incubated 6-10 minute and adds other component again after being fused into aluminium liquid.
CN201510258740.XA 2015-05-20 2015-05-20 Method for casting thin-walled aluminum alloy castings Pending CN104878252A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105385970A (en) * 2015-12-23 2016-03-09 常熟市虹桥铸钢有限公司 Thermal treatment process for thin-wall aluminum alloy casting
CN106086551A (en) * 2016-07-25 2016-11-09 慈溪市宜美佳铝业有限公司 A kind of bumper high-intensity high-tenacity aluminium alloy extrusions and preparation method thereof
CN107598088A (en) * 2017-09-25 2018-01-19 泰州康乾机械制造有限公司 A kind of method for lifting thin-wall special-shaped aluminium alloy castings yield rate
CN108889906A (en) * 2018-07-06 2018-11-27 天津千鑫有色金属制品有限公司 A kind of casting method of car brake pump aluminium alloy castings

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB604813A (en) * 1945-12-05 1948-07-09 Tennyson Fraser Bradbury A new aluminium base alloy
JPH01298139A (en) * 1988-05-24 1989-12-01 Honda Motor Co Ltd Manufacture of aluminum alloy castings
CN101445879A (en) * 2009-01-13 2009-06-03 周岳建 Method for producing water meter casing by using corrosion-resisting aluminum casting alloy and products thereof
CN103506577A (en) * 2013-09-22 2014-01-15 苏州华宇精密铸造有限公司 Precision casting method of aluminum alloy cast
CN104550740A (en) * 2013-10-28 2015-04-29 青岛和德隆机械有限公司 Method for casting large thin-wall rotation body high strength aluminum alloy casting

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB604813A (en) * 1945-12-05 1948-07-09 Tennyson Fraser Bradbury A new aluminium base alloy
JPH01298139A (en) * 1988-05-24 1989-12-01 Honda Motor Co Ltd Manufacture of aluminum alloy castings
CN101445879A (en) * 2009-01-13 2009-06-03 周岳建 Method for producing water meter casing by using corrosion-resisting aluminum casting alloy and products thereof
CN103506577A (en) * 2013-09-22 2014-01-15 苏州华宇精密铸造有限公司 Precision casting method of aluminum alloy cast
CN104550740A (en) * 2013-10-28 2015-04-29 青岛和德隆机械有限公司 Method for casting large thin-wall rotation body high strength aluminum alloy casting

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105385970A (en) * 2015-12-23 2016-03-09 常熟市虹桥铸钢有限公司 Thermal treatment process for thin-wall aluminum alloy casting
CN106086551A (en) * 2016-07-25 2016-11-09 慈溪市宜美佳铝业有限公司 A kind of bumper high-intensity high-tenacity aluminium alloy extrusions and preparation method thereof
CN106086551B (en) * 2016-07-25 2018-09-25 慈溪市宜美佳铝业有限公司 A kind of bumper high-intensity and high-tenacity aluminium alloy extrusions and preparation method thereof
CN107598088A (en) * 2017-09-25 2018-01-19 泰州康乾机械制造有限公司 A kind of method for lifting thin-wall special-shaped aluminium alloy castings yield rate
CN108889906A (en) * 2018-07-06 2018-11-27 天津千鑫有色金属制品有限公司 A kind of casting method of car brake pump aluminium alloy castings

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