CN104874766B - Low-pressure casting method of thin-wall aluminum alloy part - Google Patents
Low-pressure casting method of thin-wall aluminum alloy part Download PDFInfo
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- CN104874766B CN104874766B CN201510260834.0A CN201510260834A CN104874766B CN 104874766 B CN104874766 B CN 104874766B CN 201510260834 A CN201510260834 A CN 201510260834A CN 104874766 B CN104874766 B CN 104874766B
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Abstract
The invention discloses a low-pressure casting method of a thin-wall aluminum alloy part, and relates to the field of low-pressure metal casting. The method comprises the following steps: 1, coating a heat conducting lubricating paint on the inner walls of a mold cavity and a riser tube; 2, preheating the mold cavity and melting aluminum alloy; 3, performing gas replacement in a smelting furnace; 4, adding strontium salt; 5, deteriorating and removing impurities; 6, pouring under low pressure; 7, maintaining pressure and cooling after the pouring is finished; 8, performing bipolar homogenization treatment; 9, cooling, opening the mold and taking the part. A thin-wall aluminum alloy casting finished by the method can adapt to the complex and variable environments in aviation flight and meets the requirement on the mechanical property of the thin-wall casting in the aviation flight.
Description
Technical field
The present invention relates to aluminum casting foundry method, more particularly to thin-walled aluminum alloys component low-pressure casting method.
Background technology
Modern space flight, aviation field are more and more to the demand of complex thin-wall lighting structural member, particularly aircraft air inlet
The aspect demands such as road lip, aircraft vertical fin are projected.The method for generally adopting has casting metallurgy method, and casting metallurgy method is divided into pressure again
Casting and low pressure casting, compression casting is that liquid or semi-liquid metal are filled under high pressure, at a relatively high speed mould type
In chamber, and solidify under pressure and obtain required foundry goods, at present nearly 90% or so aluminum alloy spare part is pressure casting
Part, die-casting is primarily due to liquid Metal Filling die cavity speed height, and fluidised form is unstable, therefore using general casting die, foundry goods is easy
Produce pore, it is impossible to carry out heat treatment；The complicated foundry goods of next concave, die casting is more difficult；The die-casting die system of there is finally also
Make high cost, die casting machine production efficiency is high, the shortcomings of small lot batch manufacture is uneconomical, cause to accomplish small lot diversification production from
It is very unreasonable that economic angle is set out.
Low pressure casting is by introducing molten metal from cavity bottom, allowing molten metal filling die cavity from bottom to top, to be formed
Foundry goods.Low pressure casting is greatly lowered fee of material and machining period casting profit because without rising head and running channel, cast gate is less
It is high with rate；Directional solidification is easily formed, internal flaw is few；By changing pressing speed, molten soup is filled by laminar flow.
Although the mechanical performance of foundry goods can be made to increase during using low pressure casting, still it is difficult to meet
Tension, the mechanical performance of resistance to deformation of environment thin-walled aluminum component complicated and changeable during air transportation.
The content of the invention
The mesh of the present invention is to solve current thin-walled aluminium alloy castings using traditional compression casting mode, can there is cast
Road and rising head, so stock utilization is low, simultaneously because the melt temperature in smelting furnace is big with the temperature difference of mold cavity, cause to melt
Body crystallization rate is fast, and crystalline particle is big, and tensile strength is low.
The present invention proposes a kind of thin-walled aluminum alloys component low-pressure casting method, comprises the following steps：The first step is in mold cavity
With heat conduction slip coating is coated on the inwall of stalk：The heat-conductive coating on the inwall of mold cavity and stalk is first sprayed, then
Spray lubricant, stalk connects mold cavity with smelting furnace；The preheating of second step mold cavity and smelting aluminium alloy：To mould
Heated, and controlled the temperature of mold cavity in 250~350 DEG C, first with melting stove heat melting 7A55 aluminium alloys, treated
Melt temperature all after fusing, is secondly risen to 680~700 DEG C by alloy, removes the slag on surface, finally rises to melt temperature
710~720 DEG C carry out refine to aluminium alloy melt；Gas displacement in 3rd step smelting furnace：By the draught damper of smelting furnace to molten
Pressure is passed through in furnace and is 0.01MPa helium 1~2 minute；4th step adds strontium salt：Helium is passed through into smelting furnace by draught damper
The pressure of gas is 0.05~0.075MPa, melt temperature is heated to into 730~740 DEG C, by the 0.02% of molten alloy gross mass
~0.06% adds alterant strontium salt into smelting furnace；5th step goes bad remove impurity：Melt remove impurity after to going bad；6th step low pressure
Cast：Noble gases are passed through into smelting furnace at 700~725 DEG C, while adjusting admission pressure and mould type by regulator
Intracavity aluminum alloy melt face pressure difference is poured into a mould mold cavity in 0.02~0.04MPa；7th step after casting complete pressurize,
Cooling：Pressurize duration 2~4 minutes, stops the heating to mold cavity；The cooling die sinking pickup of 9th step, rear cooling to be heated
Thin-section casting opens mould, takes out foundry goods.
In such scheme：The first step first sprays heat-conductive coating in mold cavity and stalk, and heat-conductive coating can be accelerated to melt
The heat exchange of body and mould and stalk, then the lubricant for spraying can effectively reduce melt and flow in stalk and mold cavity
Dynamic resistance, reduces causing the local stress of thin-walled aluminium alloy castings because flowing velocity is slow and deforms and affect filling melt
The speed of mold cavity, stalk connection mold cavity and smelting furnace, stalk can realize the water conservancy diversion to the melt in smelting furnace；
Second step, the preheating of mold cavity and smelting aluminium alloy, are heated using thermocouple to mould, and control the temperature of mold cavity
Spend in 250~350 DEG C, when melt enters mold cavity, because mould type cavity temperature is in 250~350 DEG C, can be effectively
Slow down the speed of melt cooling crystallization, it is to avoid because mold cavity temperature is located at room temperature, and accelerate the speed of melt cooling crystallization
Degree, causes crystalline particle big, and foundry goods deforms because of local stress, smelting furnace melting 7A55 aluminium alloys, rises in its temperature
680~700 DEG C, the slag on surface is removed, remove surface slag, slag can be prevented in low pressure casting process below from a liter liquid
Pipe enters mold cavity, and the slag into mold cavity becomes a part for foundry goods, and affects the quality of foundry goods, finally by melt
Temperature rises to 710~720 DEG C and carries out refine to aluminium alloy melt, is, for slag of further going out, to reduce slag to foundry goods
Compositional effect；Gas displacement in 3rd step smelting furnace：Pressure is passed through into smelting furnace for 0.01MPa by the draught damper of smelting furnace
Helium 1~2 minute, the helium being passed through can tentatively be excluded to the air in smelting furnace, and the 4th step is by draught damper to smelting furnace
The helium that pressure is 0.05~0.075MPa is inside passed through, melt temperature is heated to into 730~740 DEG C, by molten alloy gross mass
0.02%~0.06% add strontium salt, strontium salt to make to form more tiny casting crystal grain during melt recrystallization into smelting furnace,
Improve the mechanical performance of foundry goods；5th step, to going bad after melt remove impurity, reduce impact of the slag to foundry goods, the 6th step, low
Pressure cast：Noble gases are passed through into smelting furnace at 700~725 DEG C, the melt liquid level in smelting furnace is applied by noble gases
Pressure, melt is injected in mold cavity by stalk, is adjusted admission pressure by regulator and is closed with aluminum in mold cavity
Golden liquid level pressure reduction can effectively reduce melt in the speed into mould cavity in 0.02~0.04MPa, reduce melt and pressing greatly
Mould cavity inwall is splashed in the case of power, causes the melt after splashing to cool down in mould cavity, affect single-casting below
Material skewness and local stress it is excessive, cause local deformation；7th step pressurize duration 2~4 minutes can cause melt
Mold cavity can be fully filled with, while stopping that the heat energy that adds of mold cavity is effectively started to carry out annealing cooling to melt；8th
Walk bipolar Homogenization Treatments, thin-section casting processed using 450 DEG C/60h+470 DEG C two-step homogenization, in crystallization process in,
The phase structure of alloy is the thick non-equilibrium eutecticum in nonequilibrium supersaturated solid solution and interdendritic, due to matrix supersaturation journey
Degree is high, along with the presence of non-equilibrium eutecticum and residual stress, causes alloy rigidity higher；It is non-equilibrium common after Homogenization Treatments
Brilliant fully dissolving, residual stress is eliminated, and supersaturated solid solution decomposes, and is separated out in cooling procedure in a large number without reinforcing effect
Equilibrium second phase so that alloy rigidity declines；9th step cooling die sinking pickup, rear cooling thin-section casting to be heated opens mould
Tool, takes out foundry goods, and foundry goods takes out after cooling down in a mold, can reduce it and stress concentration occurs because local temperature changes big,
Cause local deformation；Heating in above-mentioned second step is that the heat of smelting furnace during melting 7A55 is added using in second step
Heat, the heat in the insulation crystallization process of the bipolar Homogenization Treatments medium casting in the 8th step is mainly added by smelting furnace master
Heat, but because the interior temperature of smelting furnace is higher than insulation crystallization temperature, so the mould residing for foundry goods is located at outside smelting furnace, using molten
The waste heat of furnace, during bipolar Homogenization Treatments, temperature adjusts the thermocouple resistance silk outside mould by sensor
Electric current, realizes temperature constant, reaches the effect of isothermal holding, melts the casting of thin-walled aluminium alloy castings and heat treatment in this method
It is combined, has both can guarantee that the efficiency of casting, while also heat treatment can be carried out to thin-section casting so as to meet the machine that aviation is used
Tool performance, while the heating and thermal insulation origin of heat in heat treatment process is in melting furnace temperature, the effective energy saving of energy reduces energy
Source consumes.
Further optimization, to the control temperature of mould at 300~320 DEG C in the second step, the temperature can be effectively improved
Effectively slow down crystallization rate of the melt in mold cavity, while can be the heat treatment insulation tune of the bipolar Homogenization Treatments of the 8th step
Matter provide basis, reduce because mold temperature low melt crystallization process in stress concentration, behind heat treatment be difficult to improve thin-walled
Foundry goods crystal structure, while improving the flowing speed of melt, causes the casting thin foundry goods time period.
Further optimization, the 6th step adjusts admission pressure with aluminum alloy melt face pressure in mold cavity by regulator
Difference is equal to 0.035MPa, and the pressure reduction of 0.035MPa makes melt full of after mold cavity, and mechanical integrated performance is good.
Specific embodiment
Embodiments of the present invention are as follows：
The first step coats heat conduction slip coating on the inwall of mold cavity and stalk：
The heat-conductive coating colloid on the inwall of mold cavity and stalk is first sprayed, then Zinc Oxide is sprayed,
Stalk connects mold cavity with smelting furnace；
The preheating of second step mold cavity and smelting aluminium alloy：
Mould is heated using thermocouple, and controls the temperature of mold cavity in 250~350 DEG C,
First with melting stove heat melting 7A55 aluminium alloys, after alloy all fusing, secondly melt temperature is risen to
680~700 DEG C, the slag on surface is removed, finally melt temperature is risen to into 710~720 DEG C carries out refine to aluminium alloy melt；
Gas displacement in 3rd step smelting furnace：
Pressure is passed through into smelting furnace by the draught damper of smelting furnace and is 0.01MPa helium 1~2 minute；
4th step adds strontium salt：
The pressure for being passed through helium into smelting furnace by draught damper is 0.05~0.075MPa, and melt temperature is heated to
730~740 DEG C, strontium salt is added into smelting furnace by the 0.02%~0.06% of molten alloy gross mass；
5th step goes bad remove impurity：
Melt remove impurity after to going bad；
6th step low-pressure casting：
Noble gases are passed through into smelting furnace at 700~725 DEG C, while adjusting admission pressure and mould by regulator
Aluminum in die cavity
Aluminium alloy face pressure difference is poured into a mould mold cavity in 0.02~0.04MPa；
7th step pressurize, cooling after casting complete：
Pressurize duration 2~4 minutes, stops the heating to mold cavity；
The bipolar Homogenization Treatments of 8th step, are processed thin-section casting using 450 DEG C/60h+470 DEG C two-step homogenization, are adopted
Thermocouple electricity
Hinder silk and sensor to adjust the temperature difference of bipolar Homogenization Treatments；
9th step opens mould and takes out thin-wall part.
Embodiment 1 for second step mold cavity temperature control in above-mentioned embodiment at 255 DEG C, the cast in the 6th step
The mechanical performance of the thin-walled aluminium alloy castings that pressure reduction control draws in 0.025MPa is as follows.
Embodiment 2 for second step mold cavity temperature control in above-mentioned embodiment at 298 DEG C, the cast in the 6th step
The mechanical performance of the thin-walled aluminium alloy castings that pressure reduction control draws in 0.03MPa is as follows.
Embodiment 3 for second step mold cavity temperature control in above-mentioned embodiment at 327 DEG C, the cast in the 6th step
The mechanical performance of the thin-walled aluminium alloy castings that pressure reduction control draws in 0.04MPa is as follows.
Embodiment 4 for second step mold cavity temperature control in above-mentioned embodiment at 348 DEG C, the cast in the 6th step
The mechanical performance of the thin-walled aluminium alloy castings that pressure reduction control draws in 0.035MPa is as follows.
Embodiment 5 for second step mold cavity temperature control in above-mentioned embodiment at 350 DEG C, the cast in the 6th step
The mechanical performance of the thin-walled aluminium alloy castings that pressure reduction control draws in 0.03MPa is as follows.
Above-described is only the preferred embodiment of the present invention, it is noted that for a person skilled in the art,
Without departing from the inventive concept of the premise, some deformations and improvement can also be made, these should also be considered as the guarantor of the present invention
Shield scope, these are all without the effect and practical applicability for affecting the present invention to implement.
Claims (3)
1. a kind of thin-walled aluminum alloys component low-pressure casting method, it is characterised in that comprise the following steps：
The first step, coats heat conduction slip coating on the inwall of mold cavity and stalk：In mold cavity and stalk
Wall first sprays heat-conductive coating colloid, then sprays Zinc Oxide, and stalk connects mold cavity with smelting furnace；
The preheating of second step mold cavity and smelting aluminium alloy：Mould is heated, and controls the temperature of mold cavity in 250
~350 DEG C, first with melting stove heat melting 7A55, after alloy all fusing, secondly melt temperature is risen to into 680~
700 DEG C, the slag on surface is removed, finally melt temperature is risen to into 710~720 DEG C carries out refine to aluminium alloy melt；
Gas displacement in 3rd step smelting furnace：Pressure is passed through into smelting furnace for 0.01MPa helium by the draught damper of smelting furnace
1~2 minute；
4th step adds strontium salt：The pressure for being passed through helium into smelting furnace by draught damper is 0.05~0.075MPa, by melt
Temperature is heated to 730~740 DEG C, and strontium salt is added into smelting furnace by the 0.02%~0.06% of molten alloy gross mass；
5th step goes bad remove impurity：Melt remove impurity after to going bad；
6th step low-pressure casting：Be passed through noble gases into smelting furnace at 700~725 DEG C, at the same by regulator adjust into
Atmospheric pressure, in 0.02~0.04MPa, is poured into a mould mold cavity with aluminum alloy melt face pressure difference in mold cavity；
7th step pressurize, cooling after casting complete：Pressurize duration 2~4 minutes, stops the heating to mold cavity；
The bipolar Homogenization Treatments of 8th step, are processed thin-section casting using+470 DEG C of two-step homogenizations of 450 DEG C/60h；
9th step cooling die sinking pickup, rear cooling thin-section casting to be heated, opens mould, takes out foundry goods.
2. thin-walled aluminum alloys component low-pressure casting method as claimed in claim 1, it is characterised in that to mould in the second step
Control temperature at 300~320 DEG C.
3. thin-walled aluminum alloys component low-pressure casting method as claimed in claim 1, it is characterised in that the 6th step passes through pressure regulation
Device adjusts admission pressure and is equal to 0.03MPa with aluminum alloy melt face pressure difference in mold cavity.
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| JPH0375329A (en) * | 1989-07-10 | 1991-03-29 | Hitachi Metals Ltd | Aluminum alloy and method for its casting |
| JPH06264157A (en) * | 1993-03-09 | 1994-09-20 | Hitachi Metals Ltd | Method for casting aluminum alloy and aluminum alloy parts |
| CN101758203B (en) * | 2008-11-12 | 2013-04-03 | 郑东海 | Process for smelting and lower-pressure casting of aluminum alloy wheel hub |
| CN102284694A (en) * | 2010-06-18 | 2011-12-21 | 沈阳铸造研究所 | Sand-casting molding method of airplane cabin door |
| CN103157778A (en) * | 2011-12-16 | 2013-06-19 | 洛阳奇润电力科技有限公司 | Device protecting low-pressure casting lift pipe |
| CN103934433B (en) * | 2014-03-27 | 2015-11-18 | 哈尔滨工业大学 | Large thin-wall barrel-type casing aluminium alloy near-net-shape foundry goods low pressure casting deformation control method |
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| CN105508682A (en) * | 2015-12-29 | 2016-04-20 | 常熟市虞菱机械有限责任公司 | Wear-resistant check valve |
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Effective date of registration: 20181116 Address after: 402360 Wangu Industrial Park, Dazu District, Chongqing Patentee after: Chongqing Rong count Technology Co., Ltd. Address before: 564299 Lao Muqiao Group, Sanba Village, Longquan Town, Fenggang County, Zunyi City, Guizhou Province Patentee before: Fenggang Fengming Agricultural Machinery Manufacturing Co., Ltd. |
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Effective date of registration: 20200729 Address after: No.3, first floor, No.93, Xinghua West Road, Ronggui rongbian neighborhood committee, Shunde District, Foshan City, Guangdong Province Patentee after: Foshan Shunde Jiajian metal products Co., Ltd Address before: The Dazu District Chongqing City Industrial Park 402360 Patentee before: CHONGQING RONGJUE TECHNOLOGY Co.,Ltd. |
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Denomination of invention: Low pressure casting method for thin wall aluminum alloy parts Effective date of registration: 20220223 Granted publication date: 20170517 Pledgee: Guangdong Nanhai Rural Commercial Bank branch branch of Limited by Share Ltd. Pledgor: Foshan Shunde Jiajian metal products Co.,Ltd. Registration number: Y2022980001815 |
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