CN102179497B - Process for performing casting under negative pressure condition - Google Patents
Process for performing casting under negative pressure condition Download PDFInfo
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- CN102179497B CN102179497B CN 201110092440 CN201110092440A CN102179497B CN 102179497 B CN102179497 B CN 102179497B CN 201110092440 CN201110092440 CN 201110092440 CN 201110092440 A CN201110092440 A CN 201110092440A CN 102179497 B CN102179497 B CN 102179497B
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Abstract
The invention discloses a process for performing casting under a negative pressure condition. In the method, the advantages of investment casting and lost foam casting are combined, the high-quality casting mould of investment casting is used, and pouring is performed under a thermal condition; by using a negative pressure technology of a lost foam, the negative pressure environment is formed around the investment casting mould, and the secondary oxidation of metal is reduced; and metal filling is promoted and the feeding capacity of molten metal is improved by using the pressure difference between the casting mould and a pouring gate, so that a high-quality casting is obtained, and a large-sized casting can be cast.
Description
Technical field
The invention belongs to casting technology field, be specifically related to the casting technique under a kind of condition of negative pressure.
Background technology
Model casting is a kind of foundry engieering that is widely used, its advantage comprises that casting mold investment shell intracavity surface quality is good, dimensional accuracy is high, again owing to be the pattern of fever cast, therefore can produce the high-quality precision casting of complicated shape, but when the not good alloy of the complicated especially foundry goods of cast shape or mold-filling capacity, still face and fill the type difficult problem.For easy oxide alloy, also there is the problem of molten metal secondary oxidation; Lost foam casting is directly imbedded foam mould in the dry sand of sandbox, casting metal in the situation of negative pressure, metal and foam mould are had an effect, the foam mould pyrolysis is filled type for finishing, but during owing to the evaporative pattern cast, the die cavity non-NULL, the thermal decomposition product of foam mould can exert an influence to casting quality.
Summary of the invention
The deficiency that exists in order to overcome above-mentioned prior art, the object of the present invention is to provide the casting technique under a kind of condition of negative pressure, the present invention combines the advantage of model casting and lost foam casting, both utilized the high-quality casting mold of model casting, and under the pattern of fever condition, pour into a mould, utilized again the negative pressure technique of evaporative pattern, around the model casting casting mold, form subnormal ambient, reduce the secondary oxidation of metal, and pressure differential interior with type and the cast gate place, promote metal to fill type and raising molten metal feeding capacity, thereby obtain higher-quality foundry goods.
In order to achieve the above object, the technical solution adopted in the present invention is:
Casting technique under a kind of condition of negative pressure, at first with the shell 1 of investment casting method preparation with cast gate 6, shell 1 is pressed the predetermined time roasting to predetermined sintering temperature, be cooled to room temperature and put into again heat-resisting sandbox 2 with bleeding point 4, perhaps will directly place with the shell 1 of investment casting method preparation the heat-resisting sandbox 2 with bleeding point 4, fire resistant heat preserving sand 3 is inserted in gap between shell 1 and heat-resisting sandbox 2, temperature resistant encapsulation layer 5 in fire resistant heat preserving sand 3 surface coverage preset thickness, and cast gate 6 tops of shell 1 are exposed on the temperature resistant encapsulation layer 5, such shell 1, heat-resisting sandbox 2, fire resistant heat preserving sand 3 and temperature resistant encapsulation layer 5 have consisted of casting mold, this casting mold is placed heating furnace, simultaneously be heated to default heating-up temperature according to technological requirement, the casting mold that is heated to default heating-up temperature is taken out from heating furnace, bleeding point 4 is connected air extractor, by air extractor to bleeding in the casting mold, with the pressure setting in the casting mold under default condition of negative pressure, then inject cast gate 6 by the default molten metal that will melt, subsequently wait the molten metal that injects cast gate 6 solidify be cooled to room temperature after, molten metal has just formed foundry goods, takes out at last foundry goods from casting mold.
Described molten metal is molten stainless steel, carbon steel liquid, aluminum alloy melt, copper alloy liquid or liquid magnesium alloy.
The advantage of model casting and lost foam casting is combined, both utilized the high-quality casting mold of model casting, and under the pattern of fever condition, pour into a mould, utilized again the negative pressure technique of evaporative pattern, form subnormal ambient around the model casting casting mold, reduce the secondary oxidation of metal, and with the pressure differential of mistake with the cast gate place, promote metal to fill type and raising molten metal complementary capabilities, thereby obtain higher-quality foundry goods.
Description of drawings
Accompanying drawing is the work signal cut-away view of invention.
The specific embodiment
The present invention will be described in more detail below in conjunction with drawings and Examples.
Embodiment 1:
As shown in drawings, casting technique under the condition of negative pressure of present embodiment, at first with the shell 1 of investment casting method preparation with cast gate 6, shell 1 is pressed the roasting of 30 minutes predetermined times to 1050 ℃ of predetermined sintering temperatures, be cooled to room temperature and put into again heat-resisting sandbox 2 with bleeding point 4, perhaps will directly place with the shell 1 of investment casting method preparation the heat-resisting sandbox 2 with bleeding point 4, fire resistant heat preserving sand 3 is inserted in gap between shell 1 and heat-resisting sandbox 2, temperature resistant encapsulation layer 5 in fire resistant heat preserving sand 3 surface coverage preset thickness, and cast gate 6 tops of shell 1 are exposed on the temperature resistant encapsulation layer 5, such shell 1, heat-resisting sandbox 2, fire resistant heat preserving sand 3 and temperature resistant encapsulation layer 5 have consisted of casting mold, this casting mold is placed heating furnace, be heated to 1000 ℃ of default heating-up temperatures according to technological requirement simultaneously, the casting mold that is heated to default heating-up temperature is taken out from heating furnace, bleeding point 4 is connected air extractor, by air extractor to bleeding in the casting mold, with the pressure setting in the casting mold under default condition of negative pressure, then inject cast gate 6 by the default molten metal that will melt, subsequently wait the molten metal that injects cast gate 6 solidify be cooled to room temperature after, molten metal has just formed foundry goods, takes out at last foundry goods from casting mold.Described molten metal is molten stainless steel.
Embodiment 2:
As shown in drawings, casting technique under the condition of negative pressure of present embodiment, at first with the shell 1 of investment casting method preparation with cast gate 6, shell 1 is pressed the roasting of 30 minutes predetermined times to 1050 ℃ of predetermined sintering temperatures, be cooled to room temperature and put into again heat-resisting sandbox 2 with bleeding point 4, perhaps will directly place with the shell 1 of investment casting method preparation the heat-resisting sandbox 2 with bleeding point 4, fire resistant heat preserving sand 3 is inserted in gap between shell 1 and heat-resisting sandbox 2, temperature resistant encapsulation layer 5 in fire resistant heat preserving sand 3 surface coverage preset thickness, and cast gate 6 tops of shell 1 are exposed on the temperature resistant encapsulation layer 5, such shell 1, heat-resisting sandbox 2, fire resistant heat preserving sand 3 and temperature resistant encapsulation layer 5 have consisted of casting mold, this casting mold is placed heating furnace, be heated to 900 ℃ of default heating-up temperatures according to technological requirement simultaneously, the casting mold that is heated to default heating-up temperature is taken out from heating furnace, bleeding point 4 is connected air extractor, by air extractor to bleeding in the casting mold, with the pressure setting in the casting mold under default condition of negative pressure, then inject cast gate 6 by the default molten metal that will melt, subsequently wait the molten metal that injects cast gate 6 solidify be cooled to room temperature after, molten metal has just formed foundry goods, takes out at last foundry goods from casting mold.Described molten metal is carbon steel liquid.
Embodiment 3:
As shown in drawings, casting technique under the condition of negative pressure of present embodiment, at first with the shell 1 of investment casting method preparation with cast gate 6, shell 1 is pressed the roasting of 30 minutes predetermined times to 1050 ℃ of predetermined sintering temperatures, be cooled to room temperature and put into again heat-resisting sandbox 2 with bleeding point 4, perhaps will directly place with the shell 1 of investment casting method preparation the heat-resisting sandbox 2 with bleeding point 4, fire resistant heat preserving sand 3 is inserted in gap between shell 1 and heat-resisting sandbox 2, temperature resistant encapsulation layer 5 in fire resistant heat preserving sand 3 surface coverage preset thickness, and cast gate 6 tops of shell 1 are exposed on the temperature resistant encapsulation layer 5, such shell 1, heat-resisting sandbox 2, fire resistant heat preserving sand 3 and temperature resistant encapsulation layer 5 have consisted of casting mold, this casting mold is placed heating furnace, be heated to 700 ℃ of default heating-up temperatures according to technological requirement simultaneously, the casting mold that is heated to default heating-up temperature is taken out from heating furnace, bleeding point 4 is connected air extractor, by air extractor to bleeding in the casting mold, with the pressure setting in the casting mold under default condition of negative pressure, then inject cast gate 6 by the default molten metal that will melt, subsequently wait the molten metal that injects cast gate 6 solidify be cooled to room temperature after, molten metal has just formed foundry goods, takes out at last foundry goods from casting mold.Described molten metal is aluminum alloy melt.
Embodiment 4:
As shown in drawings, casting technique under the condition of negative pressure of present embodiment, at first with the shell 1 of investment casting method preparation with cast gate 6, shell 1 is pressed the roasting of 30 minutes predetermined times to 1050 ℃ of predetermined sintering temperatures, be cooled to room temperature and put into again heat-resisting sandbox 2 with bleeding point 4, perhaps will directly place with the shell 1 of investment casting method preparation the heat-resisting sandbox 2 with bleeding point 4, fire resistant heat preserving sand 3 is inserted in gap between shell 1 and heat-resisting sandbox 2, temperature resistant encapsulation layer 5 in fire resistant heat preserving sand 3 surface coverage preset thickness, and cast gate 6 tops of shell 1 are exposed on the temperature resistant encapsulation layer 5, such shell 1, heat-resisting sandbox 2, fire resistant heat preserving sand 3 and temperature resistant encapsulation layer 5 have consisted of casting mold, this casting mold is placed heating furnace, be heated to 800 ℃ of default heating-up temperatures according to technological requirement simultaneously, the casting mold that is heated to default heating-up temperature is taken out from heating furnace, bleeding point 4 is connected air extractor, by air extractor to bleeding in the casting mold, with the pressure setting in the casting mold under default condition of negative pressure, then inject cast gate 6 by the default molten metal that will melt, subsequently wait the molten metal that injects cast gate 6 solidify be cooled to room temperature after, molten metal has just formed foundry goods, takes out at last foundry goods from casting mold.Described molten metal is copper alloy liquid.
Embodiment 5:
As shown in drawings, casting technique under the condition of negative pressure of present embodiment, at first with the shell 1 of investment casting method preparation with cast gate 6, shell 1 is pressed the roasting of 30 minutes predetermined times to 1050 ℃ of predetermined sintering temperatures, be cooled to room temperature and put into again heat-resisting sandbox 2 with bleeding point 4, perhaps will directly place with the shell 1 of investment casting method preparation the heat-resisting sandbox 2 with bleeding point 4, fire resistant heat preserving sand 3 is inserted in gap between shell 1 and heat-resisting sandbox 2, temperature resistant encapsulation layer 5 in fire resistant heat preserving sand 3 surface coverage preset thickness, and cast gate 6 tops of shell 1 are exposed on the temperature resistant encapsulation layer 5, such shell 1, heat-resisting sandbox 2, fire resistant heat preserving sand 3 and temperature resistant encapsulation layer 5 have consisted of casting mold, this casting mold is placed heating furnace, be heated to 750 ℃ of default heating-up temperatures according to technological requirement simultaneously, the casting mold that is heated to default heating-up temperature is taken out from heating furnace, bleeding point 4 is connected air extractor, by air extractor to bleeding in the casting mold, with the pressure setting in the casting mold under default condition of negative pressure, then inject cast gate 6 by the default molten metal that will melt, subsequently wait the molten metal that injects cast gate 6 solidify be cooled to room temperature after, molten metal has just formed foundry goods, takes out at last foundry goods from casting mold.Described molten metal is liquid magnesium alloy.
Claims (7)
1. the casting technique under the condition of negative pressure, it is characterized in that: at first with the shell (1) of investment casting method preparation with cast gate (6), shell (1) is pressed the predetermined time roasting to predetermined sintering temperature, be cooled to room temperature and put into again heat-resisting sandbox (2) with bleeding point (4), perhaps will directly place with the shell (1) of investment casting method preparation the heat-resisting sandbox (2) with bleeding point (4), fire resistant heat preserving sand (3) is inserted in gap between shell (1) and heat-resisting sandbox (2), temperature resistant encapsulation layer (5) in fire resistant heat preserving sand (3) surface coverage preset thickness, and cast gate (6) top of shell (1) exposed on the temperature resistant encapsulation layer (5), such shell (1), heat-resisting sandbox (2), fire resistant heat preserving sand (3) and temperature resistant encapsulation layer (5) have consisted of casting mold, this casting mold is placed heating furnace, simultaneously be heated to default heating-up temperature according to technological requirement, the casting mold that is heated to default heating-up temperature is taken out from heating furnace, bleeding point (4) is connected air extractor, by air extractor to bleeding in the casting mold, with the pressure setting in the casting mold under default condition of negative pressure, then inject cast gate (6) by the default molten metal that will melt, subsequently wait the molten metal that injects cast gate (6) solidify be cooled to room temperature after, molten metal has just formed foundry goods, takes out at last foundry goods from casting mold.
2. the casting technique under the condition of negative pressure according to claim 1, it is characterized in that: described molten metal is molten stainless steel, carbon steel liquid, aluminum alloy melt, copper alloy liquid or liquid magnesium alloy.
3. the casting technique under the condition of negative pressure according to claim 2, it is characterized in that: at first with the shell (1) of investment casting method preparation with cast gate (6), shell (1) is pressed the roasting of 30 minutes predetermined times to 1050 ℃ of predetermined sintering temperatures, be cooled to room temperature and put into again heat-resisting sandbox (2) with bleeding point (4), perhaps will directly place with the shell (1) of investment casting method preparation the heat-resisting sandbox (2) with bleeding point (4), fire resistant heat preserving sand (3) is inserted in gap between shell (1) and heat-resisting sandbox (2), temperature resistant encapsulation layer (5) in fire resistant heat preserving sand (3) surface coverage preset thickness, and cast gate (6) top of shell (1) exposed on the temperature resistant encapsulation layer (5), such shell (1), heat-resisting sandbox (2), fire resistant heat preserving sand (3) and temperature resistant encapsulation layer (5) have consisted of casting mold, this casting mold is placed heating furnace, be heated to 1000 ℃ of default heating-up temperatures according to technological requirement simultaneously, the casting mold that is heated to default heating-up temperature is taken out from heating furnace, bleeding point (4) is connected air extractor, by air extractor to bleeding in the casting mold, with the pressure setting in the casting mold under default condition of negative pressure, then inject cast gate (6) by the default molten metal that will melt, subsequently wait the molten metal that injects cast gate (6) solidify be cooled to room temperature after, molten metal has just formed foundry goods, takes out at last foundry goods from casting mold; Described molten metal is molten stainless steel.
4. the casting technique under the condition of negative pressure according to claim 2, it is characterized in that: at first with the shell (1) of investment casting method preparation with cast gate (6), shell (1) is pressed the roasting of 30 minutes predetermined times to 1050 ℃ of predetermined sintering temperatures, be cooled to room temperature and put into again heat-resisting sandbox (2) with bleeding point (4), perhaps will directly place with the shell (1) of investment casting method preparation the heat-resisting sandbox (2) with bleeding point (4), fire resistant heat preserving sand (3) is inserted in gap between shell (1) and heat-resisting sandbox (2), temperature resistant encapsulation layer (5) in fire resistant heat preserving sand (3) surface coverage preset thickness, and cast gate (6) top of shell (1) exposed on the temperature resistant encapsulation layer (5), such shell (1), heat-resisting sandbox (2), fire resistant heat preserving sand (3) and temperature resistant encapsulation layer (5) have consisted of casting mold, this casting mold is placed heating furnace, be heated to 900 ℃ of default heating-up temperatures according to technological requirement simultaneously, the casting mold that is heated to default heating-up temperature is taken out from heating furnace, bleeding point (4) is connected air extractor, by air extractor to bleeding in the casting mold, with the pressure setting in the casting mold under default condition of negative pressure, then inject cast gate (6) by the default molten metal that will melt, subsequently wait the molten metal that injects cast gate (6) solidify be cooled to room temperature after, molten metal has just formed foundry goods, takes out at last foundry goods from casting mold; Described molten metal is carbon steel liquid.
5. the casting technique under the condition of negative pressure according to claim 2, it is characterized in that: at first with the shell (1) of investment casting method preparation with cast gate (6), shell (1) is pressed the roasting of 30 minutes predetermined times to 1050 ℃ of predetermined sintering temperatures, be cooled to room temperature and put into again heat-resisting sandbox (2) with bleeding point (4), perhaps will directly place with the shell (1) of investment casting method preparation the heat-resisting sandbox (2) with bleeding point (4), fire resistant heat preserving sand (3) is inserted in gap between shell (1) and heat-resisting sandbox (2), temperature resistant encapsulation layer (5) in fire resistant heat preserving sand (3) surface coverage preset thickness, and cast gate (6) top of shell (1) exposed on the temperature resistant encapsulation layer (5), such shell (1), heat-resisting sandbox (2), fire resistant heat preserving sand (3) and temperature resistant encapsulation layer (5) have consisted of casting mold, this casting mold is placed heating furnace, be heated to 700 ℃ of default heating-up temperatures according to technological requirement simultaneously, the casting mold that is heated to default heating-up temperature is taken out from heating furnace, bleeding point (4) is connected air extractor, by air extractor to bleeding in the casting mold, with the pressure setting in the casting mold under default condition of negative pressure, then inject cast gate (6) by the default molten metal that will melt, subsequently wait the molten metal that injects cast gate (6) solidify be cooled to room temperature after, molten metal has just formed foundry goods, takes out at last foundry goods from casting mold; Described molten metal is aluminum alloy melt.
6. the casting technique under the condition of negative pressure according to claim 2, it is characterized in that: at first with the shell (1) of investment casting method preparation with cast gate (6), shell (1) is pressed the roasting of 30 minutes predetermined times to 1050 ℃ of predetermined sintering temperatures, be cooled to room temperature and put into again heat-resisting sandbox (2) with bleeding point (4), perhaps will directly place with the shell (1) of investment casting method preparation the heat-resisting sandbox (2) with bleeding point (4), fire resistant heat preserving sand (3) is inserted in gap between shell (1) and heat-resisting sandbox (2), temperature resistant encapsulation layer (5) in fire resistant heat preserving sand (3) surface coverage preset thickness, and cast gate (6) top of shell (1) exposed on the temperature resistant encapsulation layer (5), such shell (1), heat-resisting sandbox (2), fire resistant heat preserving sand (3) and temperature resistant encapsulation layer (5) have consisted of casting mold, this casting mold is placed heating furnace, be heated to 800 ℃ of default heating-up temperatures according to technological requirement simultaneously, the casting mold that is heated to default heating-up temperature is taken out from heating furnace, bleeding point (4) is connected air extractor, by air extractor to bleeding in the casting mold, with the pressure setting in the casting mold under default condition of negative pressure, then inject cast gate (6) by the default molten metal that will melt, subsequently wait the molten metal that injects cast gate (6) solidify be cooled to room temperature after, molten metal has just formed foundry goods, takes out at last foundry goods from casting mold; Described molten metal is copper alloy liquid.
7. the casting technique under the condition of negative pressure according to claim 2, it is characterized in that: at first with the shell (1) of investment casting method preparation with cast gate (6), shell (1) is pressed the roasting of 30 minutes predetermined times to 1050 ℃ of predetermined sintering temperatures, be cooled to room temperature and put into again heat-resisting sandbox (2) with bleeding point (4), perhaps will directly place with the shell (1) of investment casting method preparation the heat-resisting sandbox (2) with bleeding point (4), fire resistant heat preserving sand (3) is inserted in gap between shell (1) and heat-resisting sandbox (2), temperature resistant encapsulation layer (5) in fire resistant heat preserving sand (3) surface coverage preset thickness, and cast gate (6) top of shell (1) exposed on the temperature resistant encapsulation layer (5), such shell (1), heat-resisting sandbox (2), fire resistant heat preserving sand (3) and temperature resistant encapsulation layer (5) have consisted of casting mold, this casting mold is placed heating furnace, be heated to 750 ℃ of default heating-up temperatures according to technological requirement simultaneously, the casting mold that is heated to default heating-up temperature is taken out from heating furnace, bleeding point (4) is connected air extractor, by air extractor to bleeding in the casting mold, with the pressure setting in the casting mold under default condition of negative pressure, then inject cast gate (6) by the default molten metal that will melt, subsequently wait the molten metal that injects cast gate (6) solidify be cooled to room temperature after, molten metal has just formed foundry goods, takes out at last foundry goods from casting mold; Described molten metal is liquid magnesium alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201110092440 CN102179497B (en) | 2011-04-13 | 2011-04-13 | Process for performing casting under negative pressure condition |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110092440 CN102179497B (en) | 2011-04-13 | 2011-04-13 | Process for performing casting under negative pressure condition |
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| CN102179497A CN102179497A (en) | 2011-09-14 |
| CN102179497B true CN102179497B (en) | 2013-01-02 |
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| CN 201110092440 Expired - Fee Related CN102179497B (en) | 2011-04-13 | 2011-04-13 | Process for performing casting under negative pressure condition |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103231016A (en) * | 2012-12-31 | 2013-08-07 | 湖北汽车工业学院 | Casting method of magnesium alloy casting |
| CN103100698B (en) * | 2013-03-04 | 2016-02-10 | 济南圣泉倍进陶瓷过滤器有限公司 | Riser buss and casting device |
| CN103143680A (en) * | 2013-03-04 | 2013-06-12 | 济南圣泉倍进陶瓷过滤器有限公司 | Riser bush and casting device |
| CN110666108A (en) * | 2019-10-21 | 2020-01-10 | 贵州安吉航空精密铸造有限责任公司 | Casting formwork boxing roasting process |
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| EP1375033A1 (en) * | 2002-06-27 | 2004-01-02 | Howmet Research Corporation | Investment casting under pressure |
| CN1739891A (en) * | 2005-09-22 | 2006-03-01 | 上海交通大学 | Vacuum sucking cast process of preparing aluminium base composite material |
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Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101412076A (en) * | 2008-03-07 | 2009-04-22 | 安徽应流铸业有限公司 | A kind of precision casting technique of ceramic shell lost foam |
| CN101269411B (en) * | 2008-04-15 | 2010-08-11 | 西安交通大学 | Method for manufacturing porous ceramic/steel group composite material |
| CN101898228A (en) * | 2010-07-31 | 2010-12-01 | 刘玉满 | Method for casting sound casting by using lost foam coated with high-performance coating in vibration way |
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2011
- 2011-04-13 CN CN 201110092440 patent/CN102179497B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1375033A1 (en) * | 2002-06-27 | 2004-01-02 | Howmet Research Corporation | Investment casting under pressure |
| CN1739891A (en) * | 2005-09-22 | 2006-03-01 | 上海交通大学 | Vacuum sucking cast process of preparing aluminium base composite material |
| CN101365552A (en) * | 2006-02-09 | 2009-02-11 | 新西伯利亚化学精选厂股份公司 | Lost-wax method associated with piezocrystallisation and a device for carrying out said method |
| CN101058115A (en) * | 2007-06-11 | 2007-10-24 | 清华大学 | Method for vacuum auxiliary gravity pouring investment casting thin wall piece |
| CN101332500A (en) * | 2007-06-28 | 2008-12-31 | 张克坚 | Negative-pressure casting method of cast |
| CN101733387A (en) * | 2010-01-21 | 2010-06-16 | 安徽中兴华汉机械有限公司 | Low pressure casting method of aluminium alloy lost foam |
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