CN103231016A - Casting method of magnesium alloy casting - Google Patents
Casting method of magnesium alloy casting Download PDFInfo
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- CN103231016A CN103231016A CN2012105907798A CN201210590779A CN103231016A CN 103231016 A CN103231016 A CN 103231016A CN 2012105907798 A CN2012105907798 A CN 2012105907798A CN 201210590779 A CN201210590779 A CN 201210590779A CN 103231016 A CN103231016 A CN 103231016A
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Abstract
The invention provides a casting method of a magnesium alloy casting. With the method, advantages of different casting methods are utilized, and defects of the methods are overcome. With a special shell preparation method and a method for preventing magnesium alloy-casting mold interfacial reaction, a unique casting technology suitable for thin-wall complex magnesium alloy part production is formed. The method has important significance for developing magnesium alloy performance advantages and satisfying automotive magnesium alloy application requirements.
Description
Technical field
The invention belongs to casting technology field, what relate to is a kind of casting method of Mg alloy castings.
Technical background
Magnesium alloy have specific strength and specific stiffness height, damping property good, be easy to advantage such as recycling, be considered to the most promising light in structure of engineering goods such as automobile, communications and transportation and quantize material.Existing Processing and Forming of Magnesium Alloys is difficult to satisfy the magnesium alloy application demand, has influenced Application of Magnesium.
Mg alloy formed by casting and plastic deformation dual mode, because magnesium alloy plastic working difficulty, casting is the main method of Mg alloy formed processing.At present, the casting method that is used for magnesium alloy is also comparatively single, mainly is compression casting, accounts for 90%.Magnesium alloy compression casting has production efficiency height, casting dimension accuracy height, surface roughness is low arrives advantage, but its mould and equipment investment are big, because of the effects limit of aspects such as mould structure and technology, are difficult to produce comparatively complicated parts of shape and structure.In addition, the inner little pore that forms the disperse distribution easily of common die casting, at high temperature expanding causes casting deformation and surface blisters, and therefore, common diecast magnesium alloy spare can not pass through heat treatment reinforcement, can not use under higher temperature.Ordinary sand casting is low because of its dimensional accuracy, roughness is high, and is unsuitable for casting thin-section casting.Investment casting method is suitable for casting dimensional accuracy height, complex-shaped foundry goods, but pattern of fever shell, gravity-assist pouring are generally adopted in model casting, magnesium alloy and pattern of fever shell interfacial reaction tendency are big, stop the interfacial reaction complex process, adopt the investment casting method of wax-pattern also to be unsuitable for producing in enormous quantities the bigger foundry goods of physical dimension.Lost foam casting is a kind of casting method that is suitable for thin-wall complicated castings production, studied the magnesium alloy evaporative-pattern casting technology in recent years both at home and abroad, because decomposing, the Foam Pattern of lost foam casting absorbs heat in liquid metal filling casting mold, and magnesium alloy thermal capacity is little, latent heat of solidification is low, the freezing range is big, fill the type needs in order to satisfy, must increase substantially pouring temperature, this causes magnesium liquid oxidation, air-breathing aggravation, and cast properties is on the low side.
In sum, existing casting of magnesium alloy making method can't better satisfy the magnesium alloy application demand, needs to seek new casting method.
Summary of the invention
The objective of the invention is to overcome the deficiency of existing casting of magnesium alloy making method, provide a kind of and be suitable for complex thin-wall Mg alloy castings production, the foundry goods structure property is good, and the casting method of low production cost and technology.
In order to solve the problems of the technologies described above, technical scheme of the present invention is as follows:
A kind of casting method of Mg alloy castings comprises that the following step poly-:
(1) makes apperance with polystyrene foam plastics;
(2) at apperance surface dip-coating wax, eliminate apperance surface bead reticulate pattern;
(3) with apperance with white glue with vinyl or PUR and the combination of running gate system bonding, obtain module;
(4) module is flooded anti-flaming dope, air dry;
(5) module behind the dipping fire proofing is made shell, is dip-coating investment precoat, stucco with module, and dry back dip-coating backing layer coating, stucco, drying with the aluminum chloride aqueous solution sclerosis, so repeat 2-3 time, with backing layer coating envelope slurry, form shell again;
(6) shell that will include module is sent into and is carried out the demoulding, roasting in the stove, obtains shell;
(7) shell is put into sandbox, fill around shell with dry sand;
(8) under negative pressure, pour into a mould liquid magnesium alloy, namely form foundry goods after the cooling.
To improvement of the technical scheme: the surface of apperance is made up of paraffin and hard ester acid with wax in step (2), its mass ratio is 2:3-3:2, fusing point is at 46-50 ℃, the dip-coating temperature is at 54-60 ℃, dip time 3-6S, slight jitter when apperance is taken out is removed redundant paraffin power liquid, namely forms smooth cere on the foam mold surface after the cooling.
Further improvement to above-mentioned technology: the anti-flaming dope in step (4) is BAS, the component of BAS and mass percent thereof are: boric acid 5-15%, Ludox 5-10%, methyl fiber 0.5-1.0%, NaOH 0.6-1.0%, surfactant 0.1-0.3%, defoamer 0.05-0.1%, all the other are water.
Further improvement again to technique scheme: in step (5), described superficial layer coating consists of: Ludox, zirconium English powder, mullite powder, glass powder with low melting point, defoamer; Described backing layer coating consists of: waterglass, mullite powder, glass powder with low melting point, defoamer; Described sanding material is quartz sand and last shop sand; The Na that adds 1.0%-3% in superficial layer coating, the backing layer coating
2O-K
2O-B
2O
3-SiO
2Be that glass powder with low melting point is as sintering agent, to reduce the shell sintering temperature.
Further improvement to technique scheme: in processing step (6), the described demoulding and roasting process carry out simultaneously, at first are warming up to 75-120 ℃, are incubated 50-60 minute; Be warming up to 550-650 ℃ again, insulation is 60-70 minute under the oxidisability atmosphere.
Further improvement to technique scheme: described processing step (7) specifically is, the shell of preparation is placed sandbox, fills dry sand around it, vacuumizes reinforcing.
Beneficial effect:
The present invention compared with prior art has the following advantages:
(1) the present invention adopts foam plastics mould, its structural design flexibly, dimensionally stable, cost be low, be suitable for the big intricate casting of production structure size, compare with lost foam casting, since Foam Pattern before cast to remove, avoided increasing substantially pouring temperature and guaranteed the apperance decomposition and fill type, thereby caused magnesium liquid oxidation, air-breathing aggravation, cast properties is on the low side.
(2) shell of the present invention is compared with the precision-investment casting shell, and the number of plies is few, shell is thin, sintering temperature is low, and forms the diaphragm that stops magnesium alloy and shell mould to be reacted on the shell surface during roasting, and shell preparation technology is simple, and cost is low.
(3) the present invention adopts cold mould vacuum-assist pouring, can guarantee to fill type, can improve the foundry goods cooling velocity again, is beneficial to thinning microstructure, improves performance.
In a word, the present invention draw several different casting methods strong point, overcome deficiency, adopt distinctive shell preparation simultaneously and prevent magnesium alloy-casting mold interfacial reaction method, formed unique foundry engieering that thin-wall complicated magnesium alloy member is produced that is applicable to, to the performance advantage of giving full play to magnesium alloy, satisfy automobile magnesium alloy application demand, have important and practical meanings.
The specific embodiment
Below further specify the present invention by specific embodiment.
(1) adopts the expandable polystyrene (EPS) bead in mould, to foam and make casting form, make the running gate system apperance with the polystyrene foam plastics cutting processing.
(2) with paraffin and the hard ester acid mass ratio preparation dip-coating wax according to 1:1, temperature control at 56-58 ℃, takes out after casting form is immersed wax liquid 4-5S, and slight jitter during taking-up is removed redundant paraffin power liquid, and the cooling back is at the smooth cere of foam mold surface formation.
(3) with white glue with vinyl apperance and running gate system bonding are combined.
(4) preparation BAS, its composition and each constituent mass percentage are: boric acid 10%, Ludox 10%, methyl fiber 0.7-%, NaOH 0.6-1.0%, surfactant JFC0.2%, n-octyl alcohol 0.05%, all the other are water.Apperance is immersed in this solution, rotate apperance, take out air dry 12 hours behind the 4-5S.
(5) make shell
(a) preparation coating investment precoat consists of: Ludox, 320 order mullite powder, 320 order Na
2O-K
2O-B
2O
3-SiO
2Be glass powder with low melting point and n-octyl alcohol, glass dust addition 2.5%, n-octyl alcohol 0.05%, SiO in the Ludox
2Content is 30%, coating powder liquor ratio 1.8:1, viscosity is the 45-50S(efflux cup method).Backing layer coating consists of: waterglass, 320 order mullite powder, 320 order Na
2O-K
2O-B
2O
3-SiO
2Be glass powder with low melting point and n-octyl alcohol, glass dust addition 2.5%, n-octyl alcohol 0.05%, modulus of water glass M=3.0-3.3, density is 1.28g/cm
2, coating powder liquor ratio 1.3:1, viscosity is 25-30S.
(b) shell is made and will have been flooded BAS and dried module immersion investment precoat, rotating module evenly is coated with module to coat the back to be taken out, and treats that the coating on the module does not drip when dropping down, spread 40-70 order quartz sand at coating, drying is 8 hours under 40-45 ℃; Then by above same mode dip-coating backing layer coating, spread shop sand on the 10-30 order, with aluminum chloride aqueous solution sclerosis, so repeat 3 times; With backing layer coating envelope slurry, form shell again.
(6) module-shell is sent into carried out the demoulding, roasting in the stove.At first be warming up to 70-80 ℃, be incubated 30 minutes; Be warming up to 110-120 ℃ then, be incubated 30 minutes; Be warming up to 600-650 ℃ again, insulation is 60 minutes under the oxidisability atmosphere, cools off with stove subsequently.
(7) will cool off shell to room temperature and be placed in the sandbox, around it, fill dry sand, vacuumize reinforcing, under the 0.06MPa negative pressure, pour into a mould liquid magnesium alloy, namely form foundry goods after the cooling.
Claims (6)
1. the casting method of a Mg alloy castings comprises that the following step poly-:
(1) makes apperance with polystyrene foam plastics;
(2) at apperance surface dip-coating wax, eliminate apperance surface bead reticulate pattern;
(3) with apperance with white glue with vinyl or PUR and the combination of running gate system bonding, obtain module;
(4) module is flooded anti-flaming dope, air dry;
(5) module behind the dipping fire proofing is made shell, is dip-coating investment precoat, stucco with module, and dry back dip-coating backing layer coating, stucco, drying with the aluminum chloride aqueous solution sclerosis, so repeat 2-3 time, with backing layer coating envelope slurry, form shell again;
(6) shell that will include module is sent into and is carried out the demoulding, roasting in the stove, obtains shell;
(7) shell is put into sandbox, fill around shell with dry sand;
(8) under negative pressure, pour into a mould liquid magnesium alloy, namely form foundry goods after the cooling.
2. casting of magnesium alloy making method according to claim 1, it is characterized in that: the surface of apperance is made up of paraffin and hard ester acid with wax in step (2), its mass ratio is 2:3-3:2, fusing point is at 46-50 ℃, the dip-coating temperature is at 54-60 ℃, dip time 3-6S, slight jitter when apperance is taken out, remove redundant paraffin power liquid, namely form smooth cere on the foam mold surface after the cooling.
3. casting of magnesium alloy making method according to claim 1, it is characterized in that: the anti-flaming dope in step (4) is BAS, the component of BAS and mass percent thereof are: boric acid 5-15%, Ludox 5-10%, methyl fiber 0.5-1.0%, NaOH 0.6-1.0%, surfactant 0.1-0.3%, defoamer 0.05-0.1%, all the other are water.
4. casting of magnesium alloy making method according to claim 1, it is characterized in that: in step (5), described superficial layer coating consists of Ludox, zirconium English powder, mullite powder, glass powder with low melting point, defoamer; Described backing layer coating consists of waterglass, mullite powder, glass powder with low melting point, defoamer; Described sanding material is quartz sand and last shop sand; The Na that adds 1.0%-3% in superficial layer coating, the backing layer coating
2O-K
2O-B
2O
3-SiO
2Be that glass powder with low melting point is as sintering agent, to reduce the shell sintering temperature.
5. casting of magnesium alloy making method according to claim 1, it is characterized in that: in processing step (6), the described demoulding and roasting process carry out simultaneously, at first are warming up to 75-120 ℃, are incubated 50-60 minute; Be warming up to 550-650 ℃ again, insulation is 60-70 minute under the oxidisability atmosphere.
6. casting of magnesium alloy making method according to claim 1 is characterized in that: described processing step (7) specifically be will preparation shell place sandbox, around it, fill dry sand, vacuumize reinforcing.
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| CN2012105907798A CN103231016A (en) | 2012-12-31 | 2012-12-31 | Casting method of magnesium alloy casting |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105436409A (en) * | 2015-12-24 | 2016-03-30 | 西北工业大学 | Precision investment casting method for magnesium alloy |
| CN105522111A (en) * | 2015-12-29 | 2016-04-27 | 青岛博泰美联化工技术有限公司 | Manufacturing method for ventilation type shell |
| CN106493298A (en) * | 2016-12-14 | 2017-03-15 | 江苏钜源机械有限公司 | A kind of process for improving lost foam casting Part Surface Roughness |
| CN107685133A (en) * | 2017-09-12 | 2018-02-13 | 东方电气集团东方汽轮机有限公司 | A kind of hot investment casting ceramic shell preparation method |
| CN108436037A (en) * | 2018-02-11 | 2018-08-24 | 清华大学 | A method of inhibiting casting thermal fragmentation |
| CN108838328A (en) * | 2018-09-04 | 2018-11-20 | 安徽惠明机械制造有限公司 | Cast paint and preparation method thereof for resin bonded sand mould |
| CN109093070A (en) * | 2018-09-04 | 2018-12-28 | 安徽惠明机械制造有限公司 | The method cast based on resin bonded sand mould |
| CN109290516A (en) * | 2018-09-04 | 2019-02-01 | 安徽惠明机械制造有限公司 | A kind of preparation method of resin bonded sand mould |
| CN110090921A (en) * | 2019-04-24 | 2019-08-06 | 广东阿诺诗厨卫有限公司 | Large area thin-wall part casting method |
| CN112705675A (en) * | 2020-12-23 | 2021-04-27 | 内蒙古北方重工业集团有限公司 | Technological method for space curved surface plate type investment casting |
| CN113894251A (en) * | 2021-12-13 | 2022-01-07 | 河北钢研德凯科技有限公司 | High-inertia mould shell for casting, preparation method thereof and method for improving magnesium alloy casting precision |
| CN113926992A (en) * | 2021-09-08 | 2022-01-14 | 洛阳双瑞精铸钛业有限公司 | Preparation method of titanium alloy casting |
| US11703361B2 (en) | 2018-07-02 | 2023-07-18 | Beijing U-Precision Tech Co., Ltd. | Five-degree-of-freedom heterodyne grating interferometry system |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105436409A (en) * | 2015-12-24 | 2016-03-30 | 西北工业大学 | Precision investment casting method for magnesium alloy |
| CN105436409B (en) * | 2015-12-24 | 2017-06-16 | 西北工业大学 | Magnesium alloy precision-investment casting method |
| CN105522111A (en) * | 2015-12-29 | 2016-04-27 | 青岛博泰美联化工技术有限公司 | Manufacturing method for ventilation type shell |
| CN106493298A (en) * | 2016-12-14 | 2017-03-15 | 江苏钜源机械有限公司 | A kind of process for improving lost foam casting Part Surface Roughness |
| CN107685133A (en) * | 2017-09-12 | 2018-02-13 | 东方电气集团东方汽轮机有限公司 | A kind of hot investment casting ceramic shell preparation method |
| CN108436037A (en) * | 2018-02-11 | 2018-08-24 | 清华大学 | A method of inhibiting casting thermal fragmentation |
| US11703361B2 (en) | 2018-07-02 | 2023-07-18 | Beijing U-Precision Tech Co., Ltd. | Five-degree-of-freedom heterodyne grating interferometry system |
| CN109290516A (en) * | 2018-09-04 | 2019-02-01 | 安徽惠明机械制造有限公司 | A kind of preparation method of resin bonded sand mould |
| CN109093070A (en) * | 2018-09-04 | 2018-12-28 | 安徽惠明机械制造有限公司 | The method cast based on resin bonded sand mould |
| CN108838328B (en) * | 2018-09-04 | 2020-07-31 | 安徽惠明机械制造有限公司 | Casting coating for resin sand mold and preparation method thereof |
| CN108838328A (en) * | 2018-09-04 | 2018-11-20 | 安徽惠明机械制造有限公司 | Cast paint and preparation method thereof for resin bonded sand mould |
| CN110090921A (en) * | 2019-04-24 | 2019-08-06 | 广东阿诺诗厨卫有限公司 | Large area thin-wall part casting method |
| CN112705675A (en) * | 2020-12-23 | 2021-04-27 | 内蒙古北方重工业集团有限公司 | Technological method for space curved surface plate type investment casting |
| CN113926992A (en) * | 2021-09-08 | 2022-01-14 | 洛阳双瑞精铸钛业有限公司 | Preparation method of titanium alloy casting |
| CN113926992B (en) * | 2021-09-08 | 2023-08-18 | 洛阳双瑞精铸钛业有限公司 | Preparation method of titanium alloy casting |
| CN113894251A (en) * | 2021-12-13 | 2022-01-07 | 河北钢研德凯科技有限公司 | High-inertia mould shell for casting, preparation method thereof and method for improving magnesium alloy casting precision |
| CN113894251B (en) * | 2021-12-13 | 2022-02-22 | 河北钢研德凯科技有限公司 | High-inertia mould shell for casting, preparation method thereof and method for improving magnesium alloy casting precision |
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Application publication date: 20130807 |