CN1394706A - Core material for making core of pouring forming process and method for making core by using said core material - Google Patents
Core material for making core of pouring forming process and method for making core by using said core material Download PDFInfo
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- CN1394706A CN1394706A CN 02133570 CN02133570A CN1394706A CN 1394706 A CN1394706 A CN 1394706A CN 02133570 CN02133570 CN 02133570 CN 02133570 A CN02133570 A CN 02133570A CN 1394706 A CN1394706 A CN 1394706A
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Abstract
The composition of core for pouring-forming includes (wt%) 6-18% of ammonium dihydrogen phosphate whose grain size is less than 200 meshes, 30-55% of quartz and/or fused quartz whose grain size is 30/140 meshes, 20-40% of quartz and/or fused quartz whose grain size is less than 200 meshes and 5-12% of magnesium oxide whose grain size is less than 270 meshes. The method for making core by using above-mentioned materials including three steps of preparing slurry material, pouring and demoulding, also must add the steps of firing and removing air. Said core material and water and/or silicon sol can be formed into the slurry material with good fluidity and solidification property, so that said core possesses smooth surface, accurate size and high strength, etc.
Description
One, technical field
The invention belongs to the casting and molding technology field, the particularly a kind of used core material of the meticulous core of thin slim core and profile requirement and preparation method of this type of core of making.
Two, background technology
It is reported that the existing method that forms the narrow or accurate internal cavities of metal casting has two kinds, a kind of is that core is set in casting mold, and another kind is to make the pellet (being own core) that extends to die cavity inside.
For sand casting, usually the core that adopts is clay sand core, organic binder bond core and sodium silicate sand core, the core strength of above-mentioned material is lower, the surface is comparatively coarse, that have even need apply coating and could use, thereby be difficult to produce thin slim core of satisfactory small size or the high core of precision requirement.Adopt sand casting, also be difficult to produce the pellet that extends to die cavity inside.
Less foundry goods with narrow lumens or inner chamber require accurate foundry goods to adopt full form casting process usually, because the bubble of coating, floating sand and be coated with and hang stucco and easily cause passage to stop up, thereby be difficult to form satisfactory own core shell, even up-to-date Improving Shell Making with Silica Sol, because the restriction of rate of drying, also be difficult to make shell for foundry goods, have to adopt prefabricated core with narrow or deep hole.The conventional core of moltening mold castings is the ceramics quartz glass core, core material cost height not only, and special equipment (annotating equipment and high temperature sintering heating furnace etc. as hot pressing) that need be expensive when core production, require very high to technical level of operators simultaneously, thereby generally only when military enterprise or Aero-Space enterprise produce senior precision castings, use, civilian smart casting factory does not generally use easily.The specially treated that the back-up sand core manufacturing craft that the accurate core of other kind adopts common core is in addition certain again, thereby be difficult to produce in enormous quantities thin thin precision, any surface finish, true-to-size core.
Three, summary of the invention
The present invention is directed to the deficiency that prior art exists, a kind of novel core material and the method for making core of this core material are provided, adopt this kind core material and corresponding method can not only produce thin thin precision, any surface finish, true-to-size core, and technology is simple, easy operating, cost reduces significantly.
Technical scheme of the present invention is as follows:
Core material selected a kind of easily with water or/and Ludox forms slurry and flowability, composition that curing property is good, so that adopt the method making core of castable.The component and the content of this kind core material comprise:
Particle is less than 200 purpose ammonium dihydrogen phosphate (ADP)s 6～18%
Particle is 30/140 purpose quartz and/or vitreous silica 30～55%
Particle is less than 200 purpose quartz and/or vitreous silica 20～40%
Particle is less than 270 purpose magnesia 5～12%
Above-mentioned percentage is percetage by weight.
In order to reduce the bubble that core material produces in forming the slurry process, can on the basis of said components, increase defoamer, the percetage by weight of defoamer is 0.002～0.2%, defoamer can adopt phosphate or organosilicon.
The core comparatively complicated for fear of structure cracks, and also can increase particle less than 200 purpose magnesium dihydrogen phosphates, the percetage by weight of magnesium dihydrogen phosphate＜8%.
The component ammonium dihydrogen phosphate (ADP) of above-mentioned core material, quartz, vitreous silica, magnesia, phosphate, organosilicon, magnesium dihydrogen phosphate are the commercial goods, can buy standby, said components is ground to the granularity of regulation respectively with ball mill, each component that will grind by the important percentage of each component is put into stirrer for mixing and evenly promptly is prepared into core material then, and the core material sealed damp-proof for preparing is standby.
The method of making the core that is used for model casting of above-mentioned core material may further comprise the steps successively:
1, preparation slurry
Or/and Ludox is a raw material, core material and water are or/and the weight ratio of Ludox is a core material to the preparation slurry with core material and water: water is or/and Ludox=100: 13～22, and water promptly forms slurry or/and core material mixed in the Ludox accent at normal temperatures and pressures.The core that core material and Ludox transfer the slurry mixed to make, the high not water boiling resistance of the intensity after the roasting, though and core material and water transfer after the core roasting of the slurry made of mixing intensity than the former low but water boiling resistance can select for use according to casting technique.
2, cast
Cast is that slurry is injected core box, carries out at normal temperatures and pressures, and core box can use silicon rubber, polytetrafluoroethylplastic plastic, timber, metal and expendable pattern material to make.
3, the demoulding
Get final product the demoulding after the slurry that injects core box forms core and solidifies fully, the height of completely crued time with temperature changes, and is generally 0.5～2 hour.
In order further to improve the normal temperature and the elevated temperature strength of core, can be for the core after the demoulding 400～800 ℃ of insulation roastings 0.5～2 hour, then with Ludox dipping and oven dry.
Make the method for the core that is used for sand casting compares with the method that making is used for the core of model casting of above-mentioned core material, also should increase the firing and removing air step, be about to core after the demoulding at the gas forming amount requirement for restriction of 400～800 ℃ of roastings when meeting the sand mold cast.This be because the core used of sand casting do not resemble the core of moltening mold castings can be with shell through high-temperature roasting and degasification.If need further to improve the intensity of core, then the core behind the firing and removing air should be flooded and oven dry with Ludox.
In order to quicken the ascent rate of bubble in the slurry, the preparation slurry can carry out under little shaking; In order to help slurry filling in core box to be shaped, cast can be carried out under little shaking.
The core that said method is made, its component and each components contents see the following form.
The component of the core of castable and each components contents (percetage by weight)
The present invention has following beneficial effect:
1,, thereby easily produces thin thin precision, any surface finish, true-to-size core because core material and water or/and Ludox can form slurry mobile and that curing property is good, are convenient to adopt the method for castable to make core.
2, because core relies on the effect castable of gravity at normal temperatures and pressures, both the core box material was not had specific (special) requirements, and do not need expensive special-purpose former again, thereby can reduce cost significantly.
3, the component of core material is easy to obtain, and the preparation method processing step of core is simple, and is not high to operating personnel's specification requirement, is convenient to produce in enormous quantities and penetration and promotion.
4, the reinforcement sintering temperature of core is annotated 1200 ℃ of the sintering temperatures of ceramics quartz glass core far below hot pressing, but thereby energy savings.
5, the core after the intensive treatment has high normal temperature strength and elevated temperature strength, can be placed on fusible pattern injection in the die mould of model casting in advance, can not soften when roasting shell and casting metal, be out of shape, and long preservation intensity can not occur and descend and powder phenomenon-tion.
Four, the specific embodiment
Embodiment 1:
The prefabricated accurate core of model casting of the nozzle foundry goods that present embodiment making Industrial Boiler is used.The nozzle castings material that Industrial Boiler is used is ZGCr
25Ni
20High nichrome steel, design feature are that spout is the slit of 5 millimeters thick, and this slit is not only wide but also dark, inside is the plane, and often can't polish again to clear up because of the bulge of slit inner surface, brill iron during casting causes scrapping, thereby very high to the quality requirement of core.
The core material that present embodiment uses is (percetage by weight):
Particle is less than 200 purpose ammonium dihydrogen phosphate (ADP)s 9%
Particle is less than 200 purpose magnesium dihydrogen phosphates 6%
Particle is 30/140 purpose vitreous silica 39.85%
Particle is less than 200 purpose vitreous silicas 35%
Particle is less than 270 purpose magnesia 10%
Organosilicon (defoamer) 0.15%
The processing step of making core in the present embodiment is:
1, preparation slurry
Five cores of each cast prepare one kilogram in slurry at every turn.The preparation slurry is a raw material with above-mentioned core material and Ludox, and the weight ratio of core material and Ludox is a core material: Ludox=100: 18, core material and Ludox transferred to mix at normal temperatures and pressures can form the slurry that meets mobile requirement in 2 minutes.
2, cast
To be placed on the detachable core box that polytetrafluoroethylplastic plastic is made on the small vibrating platform, and inject slurry to core box under little state that shakes, whole casting process carries out at normal temperatures and pressures.
3, the demoulding
Get final product the demoulding after the formed core of slurry that injects core box solidifies fully, the completely crued time is 1 hour.
4, intensive treatment
With the core after the demoulding 500 ℃ fuse 1 hour after with Ludox dipping, 200 ℃ of oven dry, promptly get required core then.
This core is put into die mould as prefabricated accurate core suppress wax-pattern, core became one with shell after the waterglass process for making shell was coated with and hangs the system shell routinely, and the employing full form casting process can be produced the satisfactory nozzle foundry goods of quality.
Embodiment 2:
Present embodiment is made the tooth portion core of the tooth mandrel on the hydraulic pressure self-return iron gate.The material of tooth mandrel is ZG35, and design feature is that the residing position of profile of tooth is difficult to carry out machining, relies on cast form, requires certain precision.
The employed core material of present embodiment is (percetage by weight):
Particle is less than 200 purpose ammonium dihydrogen phosphate (ADP)s 15%
Particle is 30/140 purpose quartz 49.9975%
Particle is less than 200 purpose quartz 25%
Particle is less than 270 purpose magnesia 10%
Organosilicon (defoamer) 0.0025%
The processing step of making core in the present embodiment is:
1, preparation slurry
10 cores of each cast prepare 0.4 kilogram in slurry at every turn.The preparation slurry is a raw material with above-mentioned core material and water, and the weight ratio of core material and water is a core material: water=100: 15, core material and water transferred to mix at normal temperatures and pressures can form the slurry that meets mobile requirement in 2 minutes.
2, cast
Core box is the disposable core box of easy fusible pattern, places it in little cast of shaking on the small vibrating platform, and whole casting process carries out at normal temperatures and pressures.
3, the demoulding
Pouring into a mould back 1 hour core can solidify fully, adopts the hot water demoulding to take out core.
4, intensive treatment
With the core after the demoulding 700 ℃ fuse 1 hour after with Ludox dipping, 200 ℃ of oven dry, promptly get required core then.
This core is put into die mould as prefabricated core suppress wax-pattern, core became one with shell after the waterglass process for making shell was coated with and hangs the system shell routinely, and the employing full form casting process can be produced the tooth mandrel that conforms to quality requirements.
Embodiment 3:
Present embodiment is made artificial joint cavity core.The material of artificial joint is ZG1Cr
18Ni
9, its design feature is that inner chamber exists the back draught be difficult for withdrawing pattern, makes the wax-pattern die mould difficulty of loosing core, and makes very complexity of structure that fusible pattern will make mould with common technology.
The employed core material of present embodiment is (percetage by weight):
Particle is less than 200 purpose ammonium dihydrogen phosphate (ADP)s 15%
Particle is 50/100 purpose vitreous silica 35.85%
Particle is 50/100 purpose quartz 17%
Particle is less than 200 purpose quartz 8%
Particle is less than 200 purpose vitreous silicas 17%
Particle is less than 270 purpose magnesia 7%
Phosphate (defoamer) 0.15%
The processing step of making core in the present embodiment is:
1, preparation slurry
5 cores of each cast prepare 0.2 kilogram in slurry at every turn.The preparation slurry is a raw material with above-mentioned core material and water and Ludox, and the Ludox that the core material of per 100 parts of weight adds the water of 10 parts of weight and 7 parts of weight is transferred to mix promptly to form in 2 minutes and met the mobile slurry that requires, and transfers to mix under the normal temperature pressure regulation and carries out.
2, cast
Core box is the disposable core box of easy fusible pattern, places it in little cast of shaking on the small vibrating platform, and whole casting process carries out at normal temperatures and pressures.
3, the demoulding
Pouring into a mould back 1 hour core can solidify fully, adopts the steam demoulding to take out core.
4, intensive treatment
Core after the demoulding is flooded with Ludox after 0.5 hour 800 ℃ of roastings, 200 ℃ of oven dry, promptly get required core then.
This core is put into die mould as prefabricated core suppress wax-pattern, core became one with shell after the waterglass process for making shell was coated with and hangs the system shell routinely, and the employing full form casting process can be produced the satisfactory artificial joint foundry goods of quality.
Embodiment 4:
Present embodiment is made the through hole core of cover piece.Cover bulk matter is the HT200 grey cast-iron, is block structure substantially, and it is that 6mm * 30mm, the degree of depth are the through hole of 50mm that a cross dimensions is arranged, and the through hole of this part is difficult to the extension mode system that the is coated with shell with conventional model casting.
The employed core material of present embodiment is (percetage by weight):
Particle is less than 200 purpose ammonium dihydrogen phosphate (ADP)s 12%
Particle is 50/100 purpose quartz 49.85%
Particle is less than 200 purpose quartz 28%
Particle is less than 270 purpose magnesia 10%
Phosphate (defoamer) 0.15%
The processing step of making core in the present embodiment is:
1, preparation slurry
10 cores of each cast prepare 0.4 kilogram in slurry at every turn.The preparation slurry is a raw material with above-mentioned core material and water, and the water that the core material of per 100 parts of weight adds 13 parts of weight is transferred to mix can form in 2 minutes and met the mobile slurry that requires, and transfers to impose little shaking when mixing, and transfers to mix at normal temperatures and pressures and carries out.
2, cast
Core box is the disposable core box of easy fusible pattern, places it in little cast of shaking on the small vibrating platform, and whole casting process carries out at normal temperatures and pressures.
3, the demoulding
Pouring into a mould back 1 hour core can solidify fully, adopts the hot water demoulding to take out core.
Directly this core is put into die mould as prefabricated core and suppress wax-pattern, investment casting method system shell, dewaxing, roasting and pouring cast part can be produced satisfactory cover piece routinely.
Claims (8)
1, the core material used of a kind of core of castable is characterized in that the component of this core material and content comprise:
Particle is less than 200 purpose ammonium dihydrogen phosphate (ADP)s 6～18%
Particle is 30/140 purpose quartz and/or vitreous silica 30～55%
Particle is less than 200 purpose quartz and/or vitreous silica 20～40%
Particle is less than 270 purpose magnesia 5～12%
Above-mentioned percentage is percetage by weight.
2, the core material used of the core of castable according to claim 1 is characterized in that this core material also contains defoamer, and the percetage by weight of defoamer is 0.002～0.2%.
3, the core material used of the core of castable according to claim 1 and 2 is characterized in that this core material also contains particle less than 200 purpose magnesium dihydrogen phosphates, the percetage by weight of magnesium dihydrogen phosphate＜8%.
4, a kind of method of making core with the described core material of claim 1～3 is characterized in that this method comprises following processing step successively:
(1) preparation slurry
Or/and Ludox is a raw material, core material and water are or/and the weight ratio of Ludox is a core material to the preparation slurry with core material and water: water is or/and Ludox=100: 13～22, and water promptly forms slurry or/and core material mixed in the Ludox accent at normal temperatures and pressures,
(2) cast
Cast is that slurry is injected core box, carries out at normal temperatures and pressures,
(3) demoulding
After forming core and solidify fully, the slurry that injects core box gets final product the demoulding.
5, the method for making core according to claim 4 is characterized in that the core after the demoulding 400～800 ℃ of insulation roastings 0.5～2 hour, then with Ludox dipping and oven dry.
6, a kind of method of making core with the described core material of claim 1～3 is characterized in that this method comprises following processing step successively:
(1) preparation slurry
Or/and Ludox is a raw material, core material and water are or/and the weight ratio of Ludox is a core material to the preparation slurry with core material and water: water is or/and Ludox=100: 13～22, and water promptly forms slurry or/and core material mixed in the Ludox accent at normal temperatures and pressures,
(2) cast
Cast is that slurry is injected core box, carries out at normal temperatures and pressures,
(3) demoulding
Get final product the demoulding at the core that slurry forms that injects core box and after solidifying fully,
(4) firing and removing air
Firing and removing air be with the core after the demoulding 400～800 ℃ of roastings to meeting the sand mold gas forming amount requirement for restriction in when cast.
7, the method for making core according to claim 6 is characterized in that the core behind the firing and removing air is flooded and oven dry with Ludox.
8, according to claim 4 or 5 or the method for 6 or 7 described making cores, it is characterized in that preparing slurry, be cast under little the shaking and carry out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02133570 CN1207118C (en) | 2002-08-02 | 2002-08-02 | Core material for making core of pouring forming process and method for making core by using said core material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02133570 CN1207118C (en) | 2002-08-02 | 2002-08-02 | Core material for making core of pouring forming process and method for making core by using said core material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1394706A true CN1394706A (en) | 2003-02-05 |
| CN1207118C CN1207118C (en) | 2005-06-22 |
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| CN 02133570 Expired - Fee Related CN1207118C (en) | 2002-08-02 | 2002-08-02 | Core material for making core of pouring forming process and method for making core by using said core material |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101934348A (en) * | 2010-09-30 | 2011-01-05 | 黄九连 | Surface sand for precise casting and preparation thereof |
| CN102935488A (en) * | 2012-11-19 | 2013-02-20 | 重庆精芯通铸造材料有限公司 | Shell filler assisting shell manufacture in investment casting and method filling shells by adopting filler |
| CN102935485A (en) * | 2012-11-19 | 2013-02-20 | 重庆精芯通铸造材料有限公司 | Core material for hot-compacted low-temperature roasted mold cores and method for manufacturing mold cores by adopting core material |
| CN103722121A (en) * | 2014-01-08 | 2014-04-16 | 湖南江滨机器（集团）有限责任公司 | Phosphate composite material as well as preparation method and salt core of phosphate composite material |
| CN105344919A (en) * | 2015-10-15 | 2016-02-24 | 济南圣泉倍进陶瓷过滤器有限公司 | Ceramsite sand used for casting |
| ITUB20150161A1 (en) * | 2015-02-09 | 2016-08-09 | Europea Microfusioni Aerospaziali S P A | PROCEDURE FOR THE REALIZATION OF SILICA CORE FOR COMPONENTS OF AERONAUTICAL AND INDUSTRIAL TURBINES. |
| CN106890927A (en) * | 2015-12-18 | 2017-06-27 | 辽宁法库陶瓷工程技术研究中心 | One kind casting ceramic air set core powder and preparation method |
| CN108500216A (en) * | 2018-04-28 | 2018-09-07 | 安徽工业大学 | A kind of quick forming method of the water-soluble core of infrared ray precuring |
| CN110421121A (en) * | 2019-08-29 | 2019-11-08 | 贵州安吉航空精密铸造有限责任公司 | A kind of vent control valve tube core manufacturing method in casting technique |
| CN110465627A (en) * | 2019-09-16 | 2019-11-19 | 郑州航空工业管理学院 | A kind of surface layer densification internal defect ceramic core manufacturing method for hollow turbine vane hot investment casting |
Families Citing this family (1)
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| CN101480697B (en) * | 2008-01-11 | 2011-04-20 | 上海中洲特种合金材料有限公司 | Case-making method of silicasol investment casting with elongated hole structure |
-
2002
- 2002-08-02 CN CN 02133570 patent/CN1207118C/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101934348A (en) * | 2010-09-30 | 2011-01-05 | 黄九连 | Surface sand for precise casting and preparation thereof |
| CN101934348B (en) * | 2010-09-30 | 2013-03-13 | 黄九连 | Surface sand for precise casting and preparation thereof |
| CN102935488A (en) * | 2012-11-19 | 2013-02-20 | 重庆精芯通铸造材料有限公司 | Shell filler assisting shell manufacture in investment casting and method filling shells by adopting filler |
| CN102935485A (en) * | 2012-11-19 | 2013-02-20 | 重庆精芯通铸造材料有限公司 | Core material for hot-compacted low-temperature roasted mold cores and method for manufacturing mold cores by adopting core material |
| CN103722121A (en) * | 2014-01-08 | 2014-04-16 | 湖南江滨机器（集团）有限责任公司 | Phosphate composite material as well as preparation method and salt core of phosphate composite material |
| ITUB20150161A1 (en) * | 2015-02-09 | 2016-08-09 | Europea Microfusioni Aerospaziali S P A | PROCEDURE FOR THE REALIZATION OF SILICA CORE FOR COMPONENTS OF AERONAUTICAL AND INDUSTRIAL TURBINES. |
| WO2016129006A1 (en) * | 2015-02-09 | 2016-08-18 | Europea Microfusioni Aerospaziali S.P.A. | Process for the production of cores of silica for components of aeronautical and industrial turbines |
| CN105344919A (en) * | 2015-10-15 | 2016-02-24 | 济南圣泉倍进陶瓷过滤器有限公司 | Ceramsite sand used for casting |
| CN106890927A (en) * | 2015-12-18 | 2017-06-27 | 辽宁法库陶瓷工程技术研究中心 | One kind casting ceramic air set core powder and preparation method |
| CN108500216A (en) * | 2018-04-28 | 2018-09-07 | 安徽工业大学 | A kind of quick forming method of the water-soluble core of infrared ray precuring |
| CN110421121A (en) * | 2019-08-29 | 2019-11-08 | 贵州安吉航空精密铸造有限责任公司 | A kind of vent control valve tube core manufacturing method in casting technique |
| CN110465627A (en) * | 2019-09-16 | 2019-11-19 | 郑州航空工业管理学院 | A kind of surface layer densification internal defect ceramic core manufacturing method for hollow turbine vane hot investment casting |
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|---|---|
| CN1207118C (en) | 2005-06-22 |
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Granted publication date: 20050622 Termination date: 20100802 |