CN102380578A - Vacuum pouring method for gypsum mold high-precision casting of aluminum and magnesium alloy - Google Patents
Vacuum pouring method for gypsum mold high-precision casting of aluminum and magnesium alloy Download PDFInfo
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- CN102380578A CN102380578A CN2011103545270A CN201110354527A CN102380578A CN 102380578 A CN102380578 A CN 102380578A CN 2011103545270 A CN2011103545270 A CN 2011103545270A CN 201110354527 A CN201110354527 A CN 201110354527A CN 102380578 A CN102380578 A CN 102380578A
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Abstract
The invention discloses a vacuum pouring method for gypsum mold high-precision casting of aluminum and magnesium alloy, which comprises: (1) manufacturing a gypsum mold; (2) removing the mold and drying; and (3) pouring vacuum pouring, taking the dried gypsum out, clearing the impurities in a molding cavity, connecting a vacuumizing tube and a vacuum pump, sealing the pouring opening, vacuumizing by using a vacuum pump, starting pouring, and stopping the vacuum pump at the end of the pouring, and cooling to room temperature. In the method adopted by the invention, a discharge pipe is mounted in the molding cavity of the mold directly, the number, diameter and mounting position of thin steel pipes can be determined according to the shape and complexity of castings, and the operation is easy. In addition, the size of the casting is not limited, and the process is effectively simplified.
Description
Technical field
The invention belongs to casting technology field, be specifically related to the vacuum pouring technology of a kind of aluminium, magnesium alloy hot investment casting, be particularly suitable for the liquid precision form of large-scale complex thin-wall almag.
Background technology
In recent years; Trend such as industrial structure function integrations such as Aeronautics and Astronautics both domestic and external, automobile, boats and ships, weapons, light weight quantification are more and more obvious, and the almag foundry goods that the parts that often the several foundry goods of former cause, forging or machined part combined are used an integral body instead replaces.These foundry goods are complex-shaped, wall thin, dimension precision requirement is high.The forming technology of the whole almag foundry goods of this type mainly contains sand casting, plaster casting at present.
Large-scale complex thin-wall almag part is because cooling velocity is fast when cast, the temperature reduction is remarkable; Make the increase of liquid metal viscosity, viscous force and surface tension increase; The filling resistance increases; Often cause various casting defects to produce, this just requires the average filling velocity of molten metal in die cavity faster than general foundry goods.Cast is complicated, thin-walled Precision Aluminum Mg alloy castings, and traditional sand mold gravitational casting and plaster casting are difficult to meet the demands, and the main problem that exists is: the filling velocity of molten metal is little can to produce defectives such as misrun, cold shut, thereby can't obtain intact foundry goods; And filling velocity cross senior general make cavity filling process not steadily, the turbulent flow aggravation, even can produce splashing of molten metal and wrap up in gas, form defective such as oxide inclusion.Therefore traditional gravitational casting is difficult to meet the demands, and needs to adopt the Special Processes of Metal Castings forming technology.
More existing at present vacuum pumping methods are applied to the gypsum mould hot investment casting, mainly are gypsum mould to be put into vacuum tank vacuumize, and in vacuum tank, pour into a mould.This method needs specific equipment, and expense is high; The size of gypsum mould has also received the restriction of vacuum tank size, and generally is difficult to the vacuum that reaches preset, so effect is not very desirable, need improve.
Summary of the invention
In order to overcome the pouring technology deficiency of complicacy, thin-walled Precision Aluminum Mg alloy castings; The present invention proposes a kind of vacuum casting method that is applicable to aluminium alloy or the hot investment casting of magnesium alloy gypsum mould; Employing directly vacuumizes the method for cast from die cavity, control technological parameter through vacuum in the control die cavity and the time that vacuumizes, and then improve casting quality; Have advantages such as simple to operate, easy control.Be particularly suitable for the shaping of large-scale complex thin-wall almag foundry goods.
The vacuum casting method of a kind of aluminium of the present invention, the hot investment casting of magnesium alloy gypsum mould is characterized in that this method comprises the steps:
(1) makes gypsum mould: the preparation slurry; And false boss is set at the diverse location of casting mold die cavity, and be convenient to lay several fine steel tubes, steel pipe can be according to foundry goods cavity structure difference and bending change; The outlet of steel pipe is guided to the top of gypsum mould; Be connected in the thick vacuum-pumping tube, and the gap between fine steel tube and the vacuum-pumping tube is blocked, slurry gets into and stops up pore when preventing to be in the milk.The gypsum mixed slurry for preparing is manually slowly stirred, get rid of the bubble in the slurry as far as possible, mixed slurry is poured into sandbox, on sandbox, apply vibration while being in the milk, finish until grouting;
(2) molding oven dry: after treating the gypsum mixture sclerosis, remove sandbox, remove fusible pattern, (or taking out apperance) moves into baking oven with gypsum mould and carries out drying.
(3) vacuumize cast: the gypsum mould of oven dry is taken out, and the impurity in the cleaning die cavity is connected thick vacuum-pumping tube, and cast gate is sealed with plastic sheeting with vavuum pump.Vacuumize with vavuum pump, make the vacuum in the die cavity reach 0.04～0.08M Pa, begin cast, finish, close vavuum pump, be cooled to room temperature until cast.
The present invention is owing to adopt die cavity directly to vacuumize the method for cast, and it is short that molten metal charges into the die cavity time, and speed is fast and steady, simple to operate, easily control.What the present invention adopted directly lays exhaust tube, the quantity that can decide fine steel tube according to the difformity and the complexity of foundry goods, diameter and installation site, processing ease on the casting mold die cavity.And adopt fine steel tube directly from die cavity, to vacuumize and can effectively get rid of the air in the die cavity, molten metal gets into and solidifies rapidly behind the fine steel tube and stop up fine steel tube during cast, can not enter into vavuum pump.
Description of drawings
Fig. 1 is aluminium of the present invention, Mg alloy castings gypsum mould hot investment casting vacuum pouring sketch map;
Fig. 2-the 4th, the situation sketch map of cast overall process, wherein, Fig. 2 for cast before gas flow situation when vacuumizing; Fig. 3 is liquid metal filling and a gas mobility status in the casting process, and Fig. 4 is the situation of filling after type is accomplished;
Among Fig. 1: 1-vavuum pump, 2-plastic sheeting, 3-vacuum-pumping tube, 4-fine steel tube, 5-false boss, 6-plastic sheeting, 7-gypsum mould.
The specific embodiment
Below through by embodiment the present invention being described in further detail, but following examples only are illustrative, and protection scope of the present invention does not receive the restriction of these embodiment.
Embodiment 1: require to adopt the support of certain aviation aircraft of gypsum mould precision casting technology casting, the long 400mm of its size, wide 250mm, high 300mm.
(1) preparation slurry; And the diverse location of the false boss in the casting mold die cavity 5 is laid 4 fine steel tubes 4 (diameter is 4mm); The outlet of fine steel tube 4 is guided to the top of gypsum mould 7; Be connected in the thick vacuum-pumping tube 3, and the gap between fine steel tube 4 and the thick vacuum-pumping tube 3 is blocked with plastic sheeting 2, slurry gets into and stops up pore when preventing to be in the milk.The gypsum mixed slurry for preparing is manually slowly stirred, get rid of the bubble in the slurry as far as possible, mixed slurry is poured into sandbox, on sandbox, apply vibration while being in the milk, finish until grouting;
(2) treat gypsum mixture sclerosis after, remove sandbox, gypsum mould 7 is moved into baking ovens.
(3) gypsum mould 7 with oven dry takes out, and the impurity in the cleaning die cavity is connected thick vacuum-pumping tube 3 with vavuum pump 1, and cast gate is sealed with plastic sheeting 6.Vacuumize with vavuum pump 1, make the vacuum in the die cavity reach 0.04MPa, begin cast, finish, close vavuum pump 1, be cooled to room temperature until cast.
Embodiment 2: require to adopt certain aviation casting magnesium AZ91 cylindrical component of gypsum mould precision casting technology casting, it is of a size of diameter 1200mm, high 200mm, wall thickness 6mm.
(1) preparation slurry; And 5 diverse locations of the false boss in the casting mold die cavity are laid 5 fine steel tubes 4 (diameter is 8mm); The outlet of fine steel tube 4 is guided to the top of gypsum mould 7; Be connected in the thick vacuum-pumping tube 3, and the gap between fine steel tube 4 and the thick vacuum-pumping tube 3 is blocked with plastic sheeting 2, slurry gets into and stops up pore when preventing to be in the milk.The gypsum mixed slurry for preparing is manually slowly stirred, get rid of the bubble in the slurry as far as possible, mixed slurry is poured into sandbox, on sandbox, apply vibration while being in the milk, finish until grouting;
(2) treat gypsum mixture sclerosis after, remove sandbox, gypsum mould 7 is moved into baking ovens.
(3) gypsum mould 7 with oven dry takes out, and the impurity in the cleaning die cavity is connected thick vacuum-pumping tube 3 with vavuum pump 1, and cast gate is sealed with plastic sheeting 6.Vacuumize with vavuum pump 1, make the vacuum in the die cavity reach 0.06MPa, begin cast, finish, close vavuum pump 1, be cooled to room temperature until cast.
Above embodiment only is exemplary, is not as limitation of the present invention, only is a more excellent value like the concrete parameter value in each step of embodiment, actual can specifically the selection according to concrete needs.For example, the diameter of steel pipe can specifically be selected according to the casting mold cavity dimension, and as being 4-8mm, the vacuum in (3) also can be preferably 0.04-0.08Mpa also in steps, and the quantity of placing steel tubes can be the 3-10 root.
Claims (4)
1. the vacuum casting method of an aluminium, the hot investment casting of magnesium alloy gypsum mould is characterized in that this method comprises the steps:
(1) makes gypsum mould
At first, preparation gypsum mixed slurry;
Secondly, false boss is set, several steel pipes are set on boss, and the outlet of each steel pipe is all caused the top of gypsum mould, be used for being connected with a vacuum-pumping tube at the diverse location of casting mold die cavity;
Then, the gypsum mixed slurry for preparing is slowly poured into sandbox after the stirring, on sandbox, apply vibration while being in the milk, finish until grouting;
(2) molding oven dry
After treating the sclerosis of gypsum mixed slurry, remove sandbox and remove fusible pattern, or take out apperance, gypsum mould is moved into baking oven carry out drying;
(3) vacuumize cast
The gypsum mould of oven dry is taken out, and the impurity in the cleaning die cavity is connected said vacuum-pumping tube with vavuum pump, and with gate seal, begins to pour into a mould after being evacuated to vacuum with vavuum pump, finishes until cast, closes vavuum pump, is cooled to room temperature.
2. vacuum casting method according to claim 1 is characterized in that, in the said step (1), before grouting, seals the gap between said steel pipe and the vacuum-pumping tube, and slurry gets into and stops up pore when preventing to be in the milk.
3. vacuum casting method according to claim 1 and 2 is characterized in that said diameter of steel tube is at 4-8mm.
4. according to the described vacuum casting method of one of claim 1-3, it is characterized in that, vacuumize in the die cavity in the said step (3) vacuum be 0.04-0.08Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201110354527 CN102380578B (en) | 2011-11-10 | 2011-11-10 | Vacuum pouring method for gypsum mold high-precision casting of aluminum and magnesium alloy |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110354527 CN102380578B (en) | 2011-11-10 | 2011-11-10 | Vacuum pouring method for gypsum mold high-precision casting of aluminum and magnesium alloy |
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| CN102380578A true CN102380578A (en) | 2012-03-21 |
| CN102380578B CN102380578B (en) | 2013-09-04 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974760A (en) * | 2012-11-22 | 2013-03-20 | 攀钢集团矿业有限公司 | Lost foam casting device and casting method |
| CN104399896A (en) * | 2014-11-15 | 2015-03-11 | 安徽省新方尊铸造科技有限公司 | Technology for improving metal mold casting moulding by negative pressure method |
| CN104475699A (en) * | 2014-11-17 | 2015-04-01 | 界首市一鸣新材料科技有限公司 | Process of directly molding foamed aluminum parts in differential pressure casting method |
| CN105251940A (en) * | 2014-07-08 | 2016-01-20 | 长葛市吉庆机械厂 | Environment-friendly casting full mold |
| CN105364047A (en) * | 2015-10-22 | 2016-03-02 | 顺德职业技术学院 | Gypsum type rapid precision casting method for nonferrous metal |
| CN107116180A (en) * | 2017-03-15 | 2017-09-01 | 成都航欣工业科技有限公司 | A kind of differential pressure type aluminium alloy gypsum mould precision-investment casting method |
| CN107838402A (en) * | 2017-11-16 | 2018-03-27 | 中国科学院长春应用化学研究所 | A kind of manufacture method of complicated magnesium alloy structural part |
| CN114247849A (en) * | 2021-11-15 | 2022-03-29 | 苏州美迈快速制造技术有限公司 | Lattice mechanism gypsum forming process |
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| CN1382542A (en) * | 2002-03-26 | 2002-12-04 | 华中科技大学 | Antigravitational vacuum method and apparatus for asting Mg allor or Al alloy with lost mould |
| CN2668296Y (en) * | 2003-12-26 | 2005-01-05 | 周彦学 | Investment casting device |
| CN1846900A (en) * | 2006-04-24 | 2006-10-18 | 王兴雷 | Casting process of thin-wall pipe and spiral roller |
| CN101024239A (en) * | 2006-02-24 | 2007-08-29 | 河南平原光电有限公司 | Technology for making magnesium-alloy fired mold casting type sheel |
| JP2009279647A (en) * | 2008-05-21 | 2009-12-03 | Taiyo Machinery Co Ltd | Evaporative pattern casting apparatus |
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2011
- 2011-11-10 CN CN 201110354527 patent/CN102380578B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1382542A (en) * | 2002-03-26 | 2002-12-04 | 华中科技大学 | Antigravitational vacuum method and apparatus for asting Mg allor or Al alloy with lost mould |
| CN2668296Y (en) * | 2003-12-26 | 2005-01-05 | 周彦学 | Investment casting device |
| CN101024239A (en) * | 2006-02-24 | 2007-08-29 | 河南平原光电有限公司 | Technology for making magnesium-alloy fired mold casting type sheel |
| CN1846900A (en) * | 2006-04-24 | 2006-10-18 | 王兴雷 | Casting process of thin-wall pipe and spiral roller |
| JP2009279647A (en) * | 2008-05-21 | 2009-12-03 | Taiyo Machinery Co Ltd | Evaporative pattern casting apparatus |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974760A (en) * | 2012-11-22 | 2013-03-20 | 攀钢集团矿业有限公司 | Lost foam casting device and casting method |
| CN102974760B (en) * | 2012-11-22 | 2014-10-29 | 攀钢集团矿业有限公司 | Lost foam casting device and casting method |
| CN105251940A (en) * | 2014-07-08 | 2016-01-20 | 长葛市吉庆机械厂 | Environment-friendly casting full mold |
| CN104399896A (en) * | 2014-11-15 | 2015-03-11 | 安徽省新方尊铸造科技有限公司 | Technology for improving metal mold casting moulding by negative pressure method |
| CN104475699A (en) * | 2014-11-17 | 2015-04-01 | 界首市一鸣新材料科技有限公司 | Process of directly molding foamed aluminum parts in differential pressure casting method |
| CN105364047A (en) * | 2015-10-22 | 2016-03-02 | 顺德职业技术学院 | Gypsum type rapid precision casting method for nonferrous metal |
| CN105364047B (en) * | 2015-10-22 | 2017-05-24 | 顺德职业技术学院 | Gypsum type rapid precision casting method for nonferrous metal |
| CN107116180A (en) * | 2017-03-15 | 2017-09-01 | 成都航欣工业科技有限公司 | A kind of differential pressure type aluminium alloy gypsum mould precision-investment casting method |
| CN107838402A (en) * | 2017-11-16 | 2018-03-27 | 中国科学院长春应用化学研究所 | A kind of manufacture method of complicated magnesium alloy structural part |
| CN114247849A (en) * | 2021-11-15 | 2022-03-29 | 苏州美迈快速制造技术有限公司 | Lattice mechanism gypsum forming process |
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Granted publication date: 20130904 Termination date: 20171110 |