CN102039370A - Cast manufacturing method for large plaster mold precise casting - Google Patents
Cast manufacturing method for large plaster mold precise casting Download PDFInfo
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- CN102039370A CN102039370A CN 201110005148 CN201110005148A CN102039370A CN 102039370 A CN102039370 A CN 102039370A CN 201110005148 CN201110005148 CN 201110005148 CN 201110005148 A CN201110005148 A CN 201110005148A CN 102039370 A CN102039370 A CN 102039370A
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- gypsum
- casting mold
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- 238000005266 casting Methods 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 239000011505 plaster Substances 0.000 title abstract 3
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 41
- 239000010440 gypsum Substances 0.000 claims abstract description 41
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000002002 slurry Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000009413 insulation Methods 0.000 claims description 22
- 238000005495 investment casting Methods 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 10
- 235000013312 flour Nutrition 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 2
- 238000005336 cracking Methods 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000010111 plaster casting Methods 0.000 abstract description 3
- 229910000611 Zinc aluminium Inorganic materials 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 abstract 1
- 239000000843 powder Substances 0.000 abstract 1
- 239000010453 quartz Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 7
- 238000001035 drying Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
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- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a cast manufacturing method for large plaster mold precise casting, which is used for solving the technical problem that bubbles exist in slurry by the existing zinc aluminum alloy plaster mold casting manufacturing method. The technical scheme comprises that by a roasting process of increasing the content of beta type hydrated gypsum in the plaster formula to optimally matching quartz powder, and gradually heating, the manufactured plaster casting has no bubble attachment, cracking or other phenomena in the grouting and roasting steps.
Description
Technical field
The present invention relates to a kind of casting mold manufacture method, particularly a kind of casting mold manufacture method of large-scale gypsum mould hot investment casting.
Background technology
Document 1 " research of allumen plaster casting technology; Lei Yongwei; Hebei Institute Of Civil Engineering's journal; 2000; vol.18.no.1 " discloses a kind of gypsum mould casting mold preparation method that is applicable to allumen, and this method grouting process is simple, but has more bubble in the slurry for preparing, attached to model surface, finally cause occurring " splashings " defective easily.
Document 2 " Kang Yan, Jin Yuchun, the research of gypsum mould drying process, Casting Equipment and technology, 2009, vol.10.no.5 " discloses a kind of drying process of gypsum mould, but need carry out in micro-wave oven, is not suitable for heavy castings production.
Summary of the invention
In order to overcome the deficiency that has bubble in the existing allumen gypsum mould casting mold preparation method slurry, the invention provides a kind of casting mold manufacture method of large-scale gypsum mould hot investment casting, by increase the content of beta-type semi-hydrated gypsum at gypsum formula, arrange in pairs or groups with silica flour optimization, and the roasting technique of the heating that progressively heats up, can make the gypsum mould casting mold produced not occur that bubble adheres to and phenomenon such as cracking in the grouting roasting stage.
The technical solution adopted for the present invention to solve the technical problems: a kind of casting mold manufacture method of large-scale gypsum mould hot investment casting is characterized in may further comprise the steps:
(1) taking by weighing mass percent respectively is 25～50% beta-type semi-hydrated gypsum, takes by weighing mass percent respectively and be 25～50% silica flour, takes by weighing mass percent respectively and be 15～40% room temperature water, the preparation gypsum slurry.
(2) gypsum slurry that configures is evenly stirred in de-airing mixer after, go into molding box along casting mold railway carriage or compartment marginal not.The hardenite of irritating good slurry must leave standstill more than 72 hours.
(3) finish gypsum mould grouting after, place fully curing in about 72 hours naturally.
(4) after the casting mold that step (2) is made is put into the resistance furnace that is preheating to 120 ℃ and is incubated 5～9 hours, be rapidly heated, whenever be rapidly heated subsequently 50 ℃, be incubated 5～9 hours successively to 180 ℃ of insulations 5～9 hours.When temperature finishes 530 ℃ of insulations, be rapidly heated to 700～780 ℃, and be incubated 20～30 hours, powered-down cools to 300 ℃ with the furnace, and insulation waits to be cast.
The invention has the beneficial effects as follows: because by increase the content of beta-type semi-hydrated gypsum at gypsum formula, arrange in pairs or groups with silica flour optimization, and the roasting technique of the heating that progressively heats up, make the gypsum mould casting mold produced not occur that bubble adheres to and phenomenon such as cracking in the grouting roasting stage.
Below in conjunction with the drawings and specific embodiments the present invention is elaborated.
Description of drawings
Fig. 1 is the temperature control curve of the casting mold manufacture method embodiment 1 of the large-scale gypsum mould hot investment casting of the present invention.
The specific embodiment
Embodiment 1: require to adopt the gypsum mould precision casting technology to cast certain type aviation foundry goods, the long 2800mm of its size; Wide 1200mm; High 420mm.
(1) takes by weighing the beta-type semi-hydrated gypsum of 1170kg respectively according to the casting mold size; The silica flour of 900kg; The room temperature water of 930kg.(2) gypsum slurry for preparing is evenly stirred by de-airing mixer, slowly add casting mold from bottom to top, carry out filling.(3) finish gypsum mould grouting after, place fully curing in about 72 hours naturally.(4) casting mold of making in the step (3) is put into the resistance furnace insulation after 8 hours that is preheating to 120 ℃, be rapidly heated, whenever be rapidly heated subsequently 50 ℃, be incubated 8 hours successively to 180 ℃ of insulations 8 hours.When temperature finishes 530 ℃ of insulations, be rapidly heated to 720 ℃, and be incubated 25 hours, powered-down cools to 300 ℃ with the furnace, and insulation waits to be cast.
Embodiment 2: require to adopt the gypsum mould precision casting technology to cast certain type aviation foundry goods, the long 2800mm of its size; Wide 1200mm; High 420mm.
(1) takes by weighing the beta-type semi-hydrated gypsum of 900kg respectively according to the casting mold size; The silica flour of 1170kg; The room temperature water of 1240kg.(2) gypsum slurry for preparing is evenly stirred by de-airing mixer, slowly add casting mold from bottom to top, carry out filling.(3) finish gypsum mould grouting after, place fully curing in about 72 hours naturally.(4) casting mold of making in the step (3) is put into the resistance furnace insulation after 9 hours that is preheating to 120 ℃, be rapidly heated, whenever be rapidly heated subsequently 50 ℃, be incubated 9 hours successively to 180 ℃ of insulations 9 hours.When temperature finishes 530 ℃ of insulations, be rapidly heated to 780 ℃, and be incubated 20 hours, powered-down cools to 300 ℃ with the furnace, and insulation waits to be cast.
Embodiment 3: require to adopt the gypsum mould precision casting technology to cast certain type aviation foundry goods, the long 2800mm of its size; Wide 1200mm; High 420mm.
(1) takes by weighing the beta-type semi-hydrated gypsum of 1080kg respectively according to the casting mold size; The silica flour of 1080kg; The room temperature water of 465kg.(2) gypsum slurry for preparing is evenly stirred by de-airing mixer, slowly add casting mold from bottom to top, carry out filling.(3) finish gypsum mould grouting after, place fully curing in about 72 hours naturally.(4) casting mold of making in the step (3) is put into the resistance furnace insulation after 5 hours that is preheating to 120 ℃, be rapidly heated, whenever be rapidly heated subsequently 50 ℃, be incubated 5 hours successively to 180 ℃ of insulations 5 hours.When temperature finishes 530 ℃ of insulations, be rapidly heated to 700 ℃, and be incubated 30 hours, powered-down cools to 300 ℃ with the furnace, and insulation waits to be cast.
Embodiment 4: require to adopt the gypsum mould precision casting technology to cast certain type aviation foundry goods, the long 2800mm of its size; Wide 1200mm; High 420mm.
(1) takes by weighing the beta-type semi-hydrated gypsum of 1080kg respectively according to the casting mold size; The silica flour of 1080kg; The room temperature water of 930kg.(2) gypsum slurry for preparing is evenly stirred by de-airing mixer, slowly add casting mold from bottom to top, carry out filling.(3) finish gypsum mould grouting after, place fully curing in about 72 hours naturally.(4) casting mold of making in the step (3) is put into the resistance furnace insulation after 6 hours that is preheating to 120 ℃, be rapidly heated, whenever be rapidly heated subsequently 50 ℃, be incubated 6 hours successively to 180 ℃ of insulations 6 hours.When temperature finishes 530 ℃ of insulations, be rapidly heated to 740 ℃, and be incubated 27 hours, powered-down cools to 300 ℃ with the furnace, and insulation waits to be cast.
Claims (1)
1. the casting mold manufacture method of a large-scale gypsum mould hot investment casting is characterized in that may further comprise the steps:
(1) taking by weighing mass percent respectively is 25～50% beta-type semi-hydrated gypsum, takes by weighing mass percent respectively and be 25～50% silica flour, takes by weighing mass percent respectively and be 15～40% room temperature water, the preparation gypsum slurry;
(2) gypsum slurry that configures is evenly stirred in de-airing mixer after, go into molding box along casting mold railway carriage or compartment marginal not; The hardenite of irritating good slurry must leave standstill more than 72 hours;
(3) finish gypsum mould grouting after, place fully curing in about 72 hours naturally;
(4) after the casting mold that step (2) is made is put into the resistance furnace that is preheating to 120 ℃ and is incubated 5～9 hours, be rapidly heated, whenever be rapidly heated subsequently 50 ℃, be incubated 5～9 hours successively to 180 ℃ of insulations 5～9 hours; When temperature finishes 530 ℃ of insulations, be rapidly heated to 700～780 ℃, and be incubated 20～30 hours, powered-down cools to 300 ℃ with the furnace, and insulation waits to be cast.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110005148A CN102039370B (en) | 2011-01-06 | 2011-01-06 | Cast manufacturing method for large plaster mold precise casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110005148A CN102039370B (en) | 2011-01-06 | 2011-01-06 | Cast manufacturing method for large plaster mold precise casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102039370A true CN102039370A (en) | 2011-05-04 |
| CN102039370B CN102039370B (en) | 2012-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110005148A Expired - Fee Related CN102039370B (en) | 2011-01-06 | 2011-01-06 | Cast manufacturing method for large plaster mold precise casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102039370B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102248123A (en) * | 2011-06-07 | 2011-11-23 | 昆山市瑞捷精密模具有限公司 | Method for forming gypsum mold |
| CN102794396A (en) * | 2011-05-24 | 2012-11-28 | 昆山市瑞捷精密模具有限公司 | Method for pouring zinc-aluminum alloy mold by utilizing gypsum mould |
| CN102794395A (en) * | 2011-05-24 | 2012-11-28 | 昆山市瑞捷精密模具有限公司 | Method for pouring zinc-tin alloy mould by utilizing gypsum mould |
| CN102794400A (en) * | 2011-05-24 | 2012-11-28 | 昆山市瑞捷精密模具有限公司 | Method for indirectly manufacturing low-melting-point alloy mold |
| CN104325074A (en) * | 2014-11-14 | 2015-02-04 | 江西桐青金属工艺品有限公司 | Method for casting large silver alloy buddha statue by use of gypsum mold |
| CN105215272A (en) * | 2015-11-10 | 2016-01-06 | 哈尔滨工业大学 | A kind of preparation method with micro-structural gypsum mould |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61193741A (en) * | 1985-02-22 | 1986-08-28 | Haidentaru Service Kk | Investment casting material for dental purpose |
| CN1106321A (en) * | 1994-07-14 | 1995-08-09 | 苏贝蒂 | Mould cast powder for precision found |
| JP2004243389A (en) * | 2003-02-14 | 2004-09-02 | Ngk Insulators Ltd | Method for drying gypsum mold for tire metallic mold |
| CN101628329A (en) * | 2009-07-30 | 2010-01-20 | 大同北方天力增压技术有限公司 | Production process adopting silicon rubber gypsum precision casting and used for hydraulic bending moment guide wheel |
| CN101745601A (en) * | 2008-12-19 | 2010-06-23 | 贵州云马飞机制造厂 | Method for directly casting zinc base alloy die blank on plaster mould |
-
2011
- 2011-01-06 CN CN201110005148A patent/CN102039370B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61193741A (en) * | 1985-02-22 | 1986-08-28 | Haidentaru Service Kk | Investment casting material for dental purpose |
| CN1106321A (en) * | 1994-07-14 | 1995-08-09 | 苏贝蒂 | Mould cast powder for precision found |
| JP2004243389A (en) * | 2003-02-14 | 2004-09-02 | Ngk Insulators Ltd | Method for drying gypsum mold for tire metallic mold |
| CN101745601A (en) * | 2008-12-19 | 2010-06-23 | 贵州云马飞机制造厂 | Method for directly casting zinc base alloy die blank on plaster mould |
| CN101628329A (en) * | 2009-07-30 | 2010-01-20 | 大同北方天力增压技术有限公司 | Production process adopting silicon rubber gypsum precision casting and used for hydraulic bending moment guide wheel |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102794396A (en) * | 2011-05-24 | 2012-11-28 | 昆山市瑞捷精密模具有限公司 | Method for pouring zinc-aluminum alloy mold by utilizing gypsum mould |
| CN102794395A (en) * | 2011-05-24 | 2012-11-28 | 昆山市瑞捷精密模具有限公司 | Method for pouring zinc-tin alloy mould by utilizing gypsum mould |
| CN102794400A (en) * | 2011-05-24 | 2012-11-28 | 昆山市瑞捷精密模具有限公司 | Method for indirectly manufacturing low-melting-point alloy mold |
| CN102248123A (en) * | 2011-06-07 | 2011-11-23 | 昆山市瑞捷精密模具有限公司 | Method for forming gypsum mold |
| CN104325074A (en) * | 2014-11-14 | 2015-02-04 | 江西桐青金属工艺品有限公司 | Method for casting large silver alloy buddha statue by use of gypsum mold |
| CN104325074B (en) * | 2014-11-14 | 2018-08-21 | 江西桐青金属工艺品股份有限公司 | A method of utilizing the plaster casting large size silver alloy figure of buddha |
| CN105215272A (en) * | 2015-11-10 | 2016-01-06 | 哈尔滨工业大学 | A kind of preparation method with micro-structural gypsum mould |
| CN105215272B (en) * | 2015-11-10 | 2017-05-03 | 哈尔滨工业大学 | Microstructural gypsum mould preparation method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102039370B (en) | 2012-09-26 |
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Granted publication date: 20120926 |
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