CN102397980A - Gypsum mold formula for casting magnesium alloy and preparation method thereof - Google Patents
Gypsum mold formula for casting magnesium alloy and preparation method thereof Download PDFInfo
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- CN102397980A CN102397980A CN201110325509XA CN201110325509A CN102397980A CN 102397980 A CN102397980 A CN 102397980A CN 201110325509X A CN201110325509X A CN 201110325509XA CN 201110325509 A CN201110325509 A CN 201110325509A CN 102397980 A CN102397980 A CN 102397980A
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Abstract
The invention discloses a gypsum mold formula for casting a magnesium alloy and a preparation method thereof, relating to preparation of a gypsum mold for casting a magnesium alloy. The gypsum mold formula comprises an additive component consisting of four basic components, including alpha-semihydrated gypsum, quartz powder, bauxite and magnesium sulfate as well as seven substances such as trisodium orthophosphate, barium chloride, a water reducing agent and the like. The invention further discloses a preparation method for the gypsum mold formula. Due to the adoption of scale graphite, oxidation of the magnesium alloy is effectively prevented; the water reducing agent is added into the formula, so that the fluidity of gypsum slurry is improved, the water consumption is lowered by 30 percent simultaneously, and the gypsum mold strength and drying efficiency are increased; the linear shrinkage of the gypsum mold can be remarkably lowered by using the gypsum mold formula together with barium chloride and urea; moreover, a solvent component consisting of tap water is adopted, so that the problems of high water consumption, poor fluidity, low strength, large size deformation, difficulty in breaking and the like existing in an ordinary gypsum mold are solved; and meanwhile, the problems of oxidization and combustion of the magnesium alloy are solved.
Description
Technical field
The invention belongs to the magnesium alloy cast technical field, be specifically related to be used for the gypsum mould prescription and the application thereof of magnesium alloy investment casting, be particularly suitable for the precision form of complex thin-wall Mg alloy.
Background technology
Die casting is present the most general Mg alloy formed technology, but die casting can only forming dimension foundry goods less, simple in structure; Because the existence of pore, foundry goods can not heat-treat or weld, and can not compare dark machined; In addition, the die casting equipment investment is high, and die-casting die is made complicated, and the cycle is long, and expense is high.
Traditional sand casting Mg alloy castings that size is bigger, complex-shaped, wall thickness is less that can be shaped is the forming technology that present large complicated Mg alloy castings extensively adopts.But because the thermal conductivity of sand mold is bigger, and the casting mold preheat temperature is low or can't preheating, makes the sand casting littler Mg alloy castings of wall thickness that can't be shaped; In addition, the dimensional accuracy of sand casting foundry goods is low, surface quality is poor, and allowance is big, has increased the workload of subsequent treatment.
Gypsum type melting mould founding, casting technique is simple, the foundry goods that structure is extremely complicated in the profile that can be shaped, wall thickness is very little, and the foundry goods precision is high, surface quality is good.But the conventional plaster type makes mould strength less owing to reasons such as water consumption are big, and size distortion is big, can cause casting mold to produce wide crackle when serious even breaks; In addition, the oxidation-protective effect of the magnesium alloy cast gypsum mould that uses at present is relatively poor, and the surface quality of foundry goods is relatively poor, has hindered the popularization of plaster casting magnesium alloy.
Summary of the invention
Defective to present forming technology; The invention provides a kind of cast magnesium alloy gypsum mould prescription; Compare with the gypsum mould prescription of present employing, this prescription has kept the advantage of traditional handicraft, and has special advantages; Advantage such as high like intensity, that size distortion is little, collapsibility good, anti-oxidation performance is good, the Mg alloy castings of be suitable for being shaped different shape and size.
Prescription of the present invention is: prescription of the present invention is made up of basic material, interpolation material (additive and reinforcing material) two parts, it is characterized in that basic material A is made up of 4 kinds of materials, and they are:
| Alpha-semi water plaster stone | 30％ | The bauxite powder | 25％ |
| Silica flour | 25％ | Magnesium sulfate | 20％ |
B partly for adding material (additive and reinforcing material), is made up of following 7 kinds of materials, and they are:
| Polycarboxylate water-reducer | 1.0％～1.2％ | Urea | 10％ |
| Tertiary sodium phosphate | 0.05％～0.15％ | Barium chloride | 3％～4％ |
| Crystalline flake graphite | 4％ | Antifoaming agent | 0.4％ |
| Glass fibre | 0.3％ |
The granularity of the alpha-semi water plaster stone in above-mentioned prescription, bauxite powder, silica flour is respectively 180 orders, 200 orders, 200 orders, and adding magnesium sulfate has fabulous collapsibility after the casting mold after the cast is soaked; Polycarboxylate water-reducer is that a kind of molecular structure is the surfactant that contains the carboxyl graft copolymer, has fine and lasting relatively water-reduction, adds polycarboxylate water-reducer to reduce the gypsum mixture water consumption.Urea and the contraction of barium chloride through different mechanism of action reduction gypsum moulds keep size stability; Tertiary sodium phosphate is a kind of efficient and inexpensive time conditioning agent; Crystalline flake graphite can effectively prevent the oxidation of foundry goods, cooperates as when pouring into a mould, carrying out technology, and effect is better.
Advantage of the present invention is: owing to add high efficiency water reducing agent; The water consumption of gypsum mixture is reduced significantly, and mixed slurry keeps good flowability simultaneously, and water consumption is merely 23% of basic material in this prescription; The intensity of gypsum mixture hardenite is higher; Intensity is 2MPa after 100 ℃ of oven dry, and intensity is 0.6MPa after 500 ℃ of roastings, for shaping large scale foundry goods provides possibility.Amount of contraction is little, and the linear shrinkage after 500 ℃ of roastings is merely 0.1%～0.2%, guarantees that the foundry goods that is shaped has very high dimensional accuracy; Casting mold influences the wide crackle of casting quality.To structure in the profile and complicated foundry goods thereof, the collapsibility that casting mold is good is most important to the cleaning of foundry goods, casting mold of the present invention through water wash away or of short duration immersion after external force can be defeated and dispersed a little, significant in the shaping of complex thin-wall foundry goods.The oxidation of casting process is the bottleneck that cast magnesium alloy is promoted, and anti-oxidation technology of present magnesium alloy and measure are complicated, operation inconvenience; The present invention directly adds sheet squama graphite in gypsum mixture; Graphite produces the characteristic of reducibility gas when utilizing cast, plays good oxidation-protective effect, cooperates with other technologies during cast; Effect is better, the Mg alloy castings smooth and bright surface of shaping.The present invention especially is fit to the molding large complex thin-wall Mg alloy castings.
The specific embodiment
Below in conjunction with specific embodiment the present invention is done further explain.
Prescription of the present invention is: prescription of the present invention is made up of basic material, interpolation material (additive and reinforcing material) two parts, it is characterized in that basic material A partly is made up of 4 kinds of materials, and they are:
| Alpha-semi water plaster stone | 30％～35％ | The bauxite powder | 25％ |
| Silica flour | 23％～25％ | Magnesium sulfate | 15％～20％ |
B partly for adding material (additive and reinforcing material), is made up of following 7 kinds of materials, and they are:
| Polycarboxylate water-reducer | 1.0％～1.2％ | Urea | 10％ |
| Tertiary sodium phosphate | 0.05％～0.15％ | Barium chloride | 3％～4％ |
| Crystalline flake graphite | 4％ | Antifoaming agent | 0.4％ |
| Glass fibre | 0.3％ |
Water is solvent, the quality of water and alpha-semi water plaster stone+bauxite powder+silica flour+magnesium sulfate quality and percentage be 23%.
The addition of barium chloride (3%～4%) is for accounting for the percentage of alpha-semi water plaster stone quality; The addition of urea (10%) is for accounting for the percentage of alpha-semi water plaster stone quality; The addition of polycarboxylate water-reducer (1.0%～1.2%) for account for alpha-semi water plaster stone+bauxite powder+silica flour quality and percentage; The addition of tertiary sodium phosphate (0.05%～0.15%) for account for alpha-semi water plaster stone+bauxite powder+silica flour+magnesium sulfate quality and percentage; The addition of crystalline flake graphite (4%) for account for alpha-semi water plaster stone+bauxite powder+silica flour+magnesium sulfate quality and percentage; The addition of antifoaming agent (0.4%) be account for alpha-semi water plaster stone+bauxite powder+silica flour+magnesium sulfate+quality and percentage, the addition of glass fibre (0.3%) be account for alpha-semi water plaster stone+bauxite powder+silica flour+magnesium sulfate+quality and percentage.
A kind of preparation method who is used for the gypsum mould prescription of cast magnesium alloy of the present invention specifically comprises the steps:
The first step prepares mixed solution; By the running water of 100 ℃ of proportioning weighings, boiling water is in order to increase solubility of additive, load weighted magnesium sulfate, urea, tertiary sodium phosphate, barium chloride to be poured in the water, use mixing plant to stir and additive was dissolved fully in 30 minutes, processing mixed solution;
Second step preparation gypsum mixed slurry; The limit mix the solution limit successively with silica flour,, bauxite powder, crystalline flake graphite, alpha-semi water plaster stone add in the mixed solution for preparing, and stirs after 2 minutes, again with polycarboxylate water-reducer, antifoaming agent, glass fibre, continues to stir 2 minutes completion slurrying;
The grouting of the 3rd step; The gypsum mixed slurry for preparing is manually slowly stirred,, mixed slurry is poured into sandbox, on sandbox, apply vibration while being in the milk, finish until grouting to get rid of the bubble in the slurry as far as possible;
The 4th step molding; After treating the gypsum mixture sclerosis, remove sandbox, gypsum mould is moved into baking oven.
Characteristic of the present invention also is to adopt different proportionings to alleviate the softening defective of gypsum mould in drying course to the foundry goods of different size; Below with different casting dimensions; Different gypsum mould prescriptions provides two embodiment; Following examples only are exemplary, and the content of wherein each constituent can change according to demands such as casting dimension, actual conditions, and concrete scope is as the criterion with claims restricted portion.
Application example 1:
Casting dimension is less than 200mm * 200mm * 200mm.Basic material is following with the consumption that adds material (additive and reinforcing material) in the gypsum mixture:
| Alpha-semi water plaster stone | 30％ | The bauxite powder | 25％ |
| Silica flour | 25％ | Magnesium sulfate | 20％ |
| Water | 23％ | Polycarboxylate water-reducer | 1.0％ |
| Urea | 10％ | Tertiary sodium phosphate | 0.1％ |
| Sheet squama graphite | 4％ | Barium chloride | 4％ |
| Antifoaming agent | 0.4％ | Glass fibre | 0.4％ |
The gypsum mould preparation finishes, and through 120 ℃ of oven dry 24 hours, casting mold was not seen obviously softening; After 10 hours, intensity is 0.58MPa through 500 ℃ of roastings, and the casting mold outer surface has width 0.1mm left and right sides blind crack; The cast(ing) surface light that cast obtains, no vein; Casting mold collapsibility after water logging is steeped 2 hours is fabulous.
Application example 2
Casting dimension is greater than 200mm * 200mm * 200mm.Basic material is following with the consumption that adds material (additive and reinforcing material) in the gypsum mixture:
| Alpha-semi water plaster stone | 35％ | The bauxite powder | 25％ |
| Silica flour | 25％ | Magnesium sulfate | 15％ |
| Water | 25％ | Polycarboxylate water-reducer | 1.1％ |
| Urea | 10％ | Tertiary sodium phosphate | 0.12％ |
| Sheet squama graphite | 4％ | Barium chloride | 4％ |
| Antifoaming agent | 0.4％ | Glass fibre | 0.4％ |
The gypsum mould preparation finishes, and through 120 ℃ of oven dry 24 hours, casting mold was not seen obviously softening; After 10 hours, intensity is 0.55MPa through 500 ℃ of roastings, and the casting mold outer surface has width 0.15mm left and right sides micro-crack; The cast(ing) surface light that cast obtains, no vein; Casting mold collapsibility after water logging is steeped 2 hours is good.
Claims (7)
1. a gypsum mould prescription that is used for cast magnesium alloy comprises basic material, adds material and solvent, wherein,
The component of said basic material and quality thereof very content are respectively:
The component and the content thereof of said interpolation material are respectively:
Wherein, In the said interpolation material; The content of barium chloride is the mass percent with alpha-semi water plaster stone, and content of urea is the mass percent with alpha-semi water plaster stone, and the content of polycarboxylate water-reducer is the mass percent with alpha-semi water plaster stone, bauxite powder and silica flour quality sum; The content of tertiary sodium phosphate is the mass percent with basic material; The content of crystalline flake graphite is the mass percent with basic material, and the content of antifoaming agent is the mass percent with basic material and solvent quality sum, and the content of glass fibre is the mass percent with basic material and solvent quality sum.
2. gypsum mould prescription according to claim 1 is characterized in that, solvent is a water in this prescription.
3. gypsum mould prescription according to claim 1 and 2 is characterized in that, the mass percent of solvent and basic material described in this prescription is 23%.
4. according to the described gypsum mould prescription of one of claim 1-3, it is characterized in that said alpha-semi water plaster stone granularity is 180 orders.
5. according to the described gypsum mould prescription of one of claim 1-4, it is characterized in that the granularity of said bauxite powder is 200 orders.
6. according to the described gypsum mould prescription of one of claim 1-5, it is characterized in that the granularity of said silica flour is 200 orders.
7. the preparation method of the described gypsum mould prescription of one of claim 1-6 specifically comprises the steps:
The first step prepares mixed solution
By the running water of 100 ℃ of proportioning weighings, load weighted magnesium sulfate, urea, tertiary sodium phosphate, barium chloride to be poured in the water, stirring is dissolved additive fully, processes mixed solution;
Second step preparation gypsum mixed slurry
The limit is stirred said mixed solution limit and successively silica flour, bauxite powder, crystalline flake graphite, alpha-semi water plaster stone is added in the mixed solution for preparing, and adds polycarboxylate water-reducer, antifoaming agent, glass fibre again, continues the end time of stirring, and accomplishes slurrying;
The grouting of the 3rd step
The gypsum mixed slurry for preparing is poured into sandbox, and on sandbox, apply vibration simultaneously, finish until grouting;
The 4th step molding
After treating the sclerosis of gypsum mixed slurry, remove sandbox, gypsum mould is moved into baking oven, promptly accomplish the preparation of gypsum mould prescription.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103111585A (en) * | 2013-02-04 | 2013-05-22 | 中国兵器工业第五九研究所 | Method for preparing ceramic gypsum composite mould by using magnesium alloy |
| CN103658505A (en) * | 2013-12-06 | 2014-03-26 | 机械科学研究总院先进制造技术研究中心 | Gypsum cast powder |
| CN103819161A (en) * | 2013-12-17 | 2014-05-28 | 山东沾化奥仕化学有限公司 | Tire casting gypsum powder containing sulfonated melamine formaldehyde resin water reducing agent and preparation method of tire casting gypsum powder |
| CN104350024A (en) * | 2012-05-30 | 2015-02-11 | 圣戈班普拉科公司 | Gypsum composition for refractory moulds |
| CN104525846A (en) * | 2014-12-01 | 2015-04-22 | 繁昌县恒鑫汽车零部件有限公司 | Sand inclusion-preventing cast iron molding sand and preparation method thereof |
| CN105436410A (en) * | 2015-12-25 | 2016-03-30 | 西安奥邦科技有限责任公司 | Plaster mold for titanium alloy casting |
| CN105522101A (en) * | 2016-02-19 | 2016-04-27 | 江苏一夫科技股份有限公司 | Industrial byproduct gypsum mold casting powder for investment casting and preparing method of industrial byproduct gypsum mold casting powder |
| 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 |
| CN109622889A (en) * | 2018-12-31 | 2019-04-16 | 成都新航工业科技有限公司 | In conjunction with the process of silica solution quartz sand and gypsum mould mixture shell |
| CN110893453A (en) * | 2019-12-02 | 2020-03-20 | 中北大学 | Gypsum mold precision casting method and device for magnesium alloy casting |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104350024A (en) * | 2012-05-30 | 2015-02-11 | 圣戈班普拉科公司 | Gypsum composition for refractory moulds |
| CN103111585B (en) * | 2013-02-04 | 2017-12-29 | 中国兵器工业第五九研究所 | A kind of preparation technology of magnesium alloy cast ceramics gypsum composite mould |
| CN103111585A (en) * | 2013-02-04 | 2013-05-22 | 中国兵器工业第五九研究所 | Method for preparing ceramic gypsum composite mould by using magnesium alloy |
| CN103658505A (en) * | 2013-12-06 | 2014-03-26 | 机械科学研究总院先进制造技术研究中心 | Gypsum cast powder |
| CN103658505B (en) * | 2013-12-06 | 2015-11-11 | 机械科学研究总院先进制造技术研究中心 | Gypsum casting powder |
| CN103819161A (en) * | 2013-12-17 | 2014-05-28 | 山东沾化奥仕化学有限公司 | Tire casting gypsum powder containing sulfonated melamine formaldehyde resin water reducing agent and preparation method of tire casting gypsum powder |
| CN103819161B (en) * | 2013-12-17 | 2016-01-20 | 山东沾化奥仕化学有限公司 | A kind of tire casting gypsum powder containing sulfonated melamine compound resin water reducer and preparation method thereof |
| CN104525846A (en) * | 2014-12-01 | 2015-04-22 | 繁昌县恒鑫汽车零部件有限公司 | Sand inclusion-preventing cast iron molding sand and preparation method thereof |
| CN105436410A (en) * | 2015-12-25 | 2016-03-30 | 西安奥邦科技有限责任公司 | Plaster mold for titanium alloy casting |
| CN105522101A (en) * | 2016-02-19 | 2016-04-27 | 江苏一夫科技股份有限公司 | Industrial byproduct gypsum mold casting powder for investment casting and preparing method of industrial byproduct gypsum mold casting powder |
| 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 |
| CN109622889A (en) * | 2018-12-31 | 2019-04-16 | 成都新航工业科技有限公司 | In conjunction with the process of silica solution quartz sand and gypsum mould mixture shell |
| CN110893453A (en) * | 2019-12-02 | 2020-03-20 | 中北大学 | Gypsum mold precision casting method and device for magnesium alloy casting |
| CN110893453B (en) * | 2019-12-02 | 2024-02-27 | 中北大学 | Gypsum type precision casting method and device for magnesium alloy castings |
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Application publication date: 20120404 |