CN102976722A - Mould core for cavity casting piece and manufacturing method thereof - Google Patents
Mould core for cavity casting piece and manufacturing method thereof Download PDFInfo
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- CN102976722A CN102976722A CN2012105014586A CN201210501458A CN102976722A CN 102976722 A CN102976722 A CN 102976722A CN 2012105014586 A CN2012105014586 A CN 2012105014586A CN 201210501458 A CN201210501458 A CN 201210501458A CN 102976722 A CN102976722 A CN 102976722A
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Abstract
The invention provides a mould core for cavity casting piece and a manufacturing method thereof. The mould core consists of materials by weight part: 30-35 parts of zircon sand, 65-70 parts of fused quartz sand, 30-35 parts of ethyl silicate, 5-8 parts of plasticizer and 2-3 parts of a scattering agent. The manufacturing method comprises the following steps of: preparing the materials according to a ratio; mixing and stirring the materials; de-molding after pouring and sizing, drying in a sealing way and roasting. The manufacturing method provided by the invention is used for manufacturing the mould core, so that the surface fineness of the mould core can be improved, and the requirements of the mould core on different products can be met by adjusting the ratio of the different materials; and meanwhile, the mould core has good surface fineness and collapsibility; and the difficultly problems of size and fineness of an inner cavity of the complex precise casting piece and cleaning of the inner cavity of the complex precise casting piece can be solved, so that the casting yield can be improved.
Description
Technical field
The present invention relates to a kind of core material and preparation method thereof.
Background technology
Foundary industry is with a long history, by casting straight forming foundry goods, can reduce machining cost, reduces product cost, in industrial production in occupation of critical role.Along with the development of science and technology, the product of various mechanisms complexity is more and more, and therefore, the disposal molding problem that solves the belt type cavity foundry goods is just more important concerning enterprise.Core is a kind of subsidiary material that are used to form the belt type cavity foundry goods in the precision casting, and main raw is pure quartz glass powder, zircon flour, inorganic fibre, silicon sol etc., and by the ratio collocation of material, compression moulding then by roasting, obtains building core.Building core is placed in the wax-pattern die mould penetrates wax, obtain the wax-pattern identical with the cast product shape, by coating, dewaxing, roasting, cast, cleaning process, obtain foundry goods again.
The core of present domestic use mainly is ceramic core, because self surface smoothness is not high, therefore be difficult to make the internal surface of foundry goods to have higher smooth finish, and after the foundry goods moulding, because the residual strength of ceramic core is higher, so that the cleaning of foundry goods is very difficult, need with clearing up after acid or alkali long-time (24-48h) corrosion, not only cost is high, and contaminate environment, the product of producing (particularly thin-section casting) usually causes product rejection because the cleaning link can not thoroughly solve.
Chinese patent ZL200610045815.7 discloses a kind of slush casting ceramic core and preparation method thereof, mainly be as moiety take fused silica powder, porous silica material and Mo Laishi, mix core material, the preparation slip, being about to core material melts, mixes with softening agent, an amount of oleic acid, then be pressed into core, sintering is done High-Temperature Strengthening and low-temperature reinforcement again and is processed.The core product that this scheme obtains have core-breaking rate low, the characteristics such as do not crack, but it belongs to ceramic core, inevitably has the intrinsic defective of ceramic core foundry goods.
Summary of the invention
For addressing the above problem, the invention provides a kind of foundry goods with core material and the method for preparing material, make core, by the ratio adjustment to core material, make core have good surface smoothness and collapsibility, solve complex precise cast member inner cavity size smooth finish and a cleaning difficult problem, thereby improved the yield rate of foundry goods.
The objective of the invention is to be achieved by following technical solution.
A kind of die cavity foundry goods core, it is characterized in that: the material by following weight part forms:
30～35 parts of zircon sands, 65～70 parts in fused quartz sand, 30～35 parts of tetraethyl silicate, 5～8 parts in softening agent, 2～3 parts of dispersants.
The weight part of described each material is:
32～34 parts of zircon sands, 66～68 parts in fused quartz sand, 32～34 parts of silicic acid second, 6～7 parts in softening agent, 2～3 parts of dispersants.
Described zircon sand and fused quartz sand are powder.
Described softening agent refer in paraffin, beeswax, polyethylene, the stearic acid any or several.
Described dispersant refer in sodium silicate sand, carbonate, phosphoric acid salt and the organic acid salt any or several.
A kind of die cavity foundry goods mainly comprises the steps: with the making method of core
(1) draw materials by proportioning: take by weighing each material by following weight part:
30～35 parts of zircon sands, 65～70 parts in fused quartz sand, 30～35 parts of tetraethyl silicate, 5～8 parts in softening agent, 2～3 parts of dispersants;
(2) mix and blend material: first powder stirring 1～2min that proportioning is good, it is mixed, then add successively tetraethyl silicate, softening agent, dispersant, restir 2～3min is until slurry mixes;
(3) demoulding behind the form: slurry is poured in the core mold, leave standstill 5～6min, then die sinking is taken out;
(4) close drying: the dry 2～6h of sealing in encloses container;
(5) roasting: need ladder-elevating temperature during the core roasting, 95～105 ℃ of insulation 30min, 395～405 ℃ of insulation 1h, 600 ℃ of insulation 1h.
The configuration proportion error control of material in the described step (1) when preparation is between ± 2%.
Compared with prior art, beneficial effect of the present invention: adopt the mode of production of recording to make core, improved the surface smoothness of core, by the ratio adjustment of differing materials, satisfied the requirement of core to variant production; Make simultaneously core have good surface smoothness and collapsibility, solved complex precise cast member inner cavity size smooth finish and a cleaning difficult problem, thereby improved the yield rate of foundry goods.
Embodiment
Further describe technical scheme of the present invention below in conjunction with embodiment, but that claimed scope is not limited to is described.
Embodiment 1
(1) draws materials by proportioning: get zircon sand 30kg, fused quartz sand 65kg, tetraethyl silicate 30kg, paraffin 5kg, sodium silicate sand 2kg.When drawing materials, according to the variant production requirement, its ratio must strictly be controlled, and error control is between ± 2%;
(2) material mixing stirs: first zircon sand and fused quartz sand are stirred 1min, it is mixed, then add successively tetraethyl silicate, paraffin, sodium silicate sand, restir 2min is until slurry mixes;
(3) demoulding behind the form: slurry is poured in the core mold, leave standstill 5min, then die sinking is taken out;
(4) close drying: the dry 2h of sealing in encloses container;
(5) roasting: need ladder-elevating temperature during the core roasting: 100 ℃ of insulation 30min, 400 ℃ of insulation 1h, 600 ℃ of insulation 1h.
Embodiment 2
(1) draw materials by proportioning: zircon sand is 33kg, and fused quartz sand is 67kg, tetraethyl silicate 32kg, beeswax 6kg, calcium carbonate 2.5kg.When drawing materials, according to the variant production requirement, its ratio must strictly be controlled, and error control is between ± 2%;
(2) material mixing stirs: first zircon sand and fused quartz sand are stirred 1.5min, it is mixed, then add successively tetraethyl silicate, beeswax, calcium carbonate, restir 2.5min is until slurry mixes;
(3) demoulding behind the form: slurry is poured in the core mold, leave standstill 5.5min, then die sinking is taken out;
(4) close drying: the dry 4h of sealing in encloses container;
(5) roasting: need ladder-elevating temperature during the core roasting: 105 ℃ of insulation 30min, 405 ℃ of insulation 1h, 600 ℃ of insulation 1h.
Embodiment 3
(1) draw materials by proportioning: zircon sand is 35kg, and fused quartz sand is 70kg, tetraethyl silicate 35kg, polyethylene 8kg, calcium phosphate 3kg.When drawing materials, according to the variant production requirement, its ratio must strictly be controlled, and error control is between ± 2%;
(2) material mixing stirs: first zircon sand and fused quartz sand are stirred 2min, it is mixed, then add successively tetraethyl silicate, polyethylene, calcium phosphate, restir 3min is until slurry mixes;
(3) demoulding behind the form: slurry is poured in the core mold, leave standstill 6min, then die sinking is taken out;
(4) close drying: the dry 6h of sealing in encloses container;
(5) roasting: need ladder-elevating temperature during the core roasting: 95 ℃ of insulation 30min, 395 ℃ of insulation 1h, 600 ℃ of insulation 1h.
Claims (7)
1. die cavity foundry goods core, it is characterized in that: the material by following weight part forms:
30～35 parts of zircon sands, 65～70 parts in fused quartz sand, 30～35 parts of tetraethyl silicate, 5～8 parts in softening agent, 2～3 parts of dispersants.
2. a kind of die cavity foundry goods core as claimed in claim 1, it is characterized in that: the weight part of described each material is:
32～34 parts of zircon sands, 66～68 parts in fused quartz sand, 32～34 parts of tetraethyl silicate, 6～7 parts in softening agent, 2～3 parts of dispersants.
3. a kind of die cavity foundry goods core as claimed in claim 1, it is characterized in that: described zircon sand and fused quartz sand are powder.
4. a kind of die cavity foundry goods core as claimed in claim 1 is characterized in that: described softening agent refer in paraffin, beeswax, polyethylene, the stearic acid any or several.
5. a kind of die cavity foundry goods core as claimed in claim 1 is characterized in that: described dispersant refer in sodium silicate sand, carbonate, phosphoric acid salt and the organic acid salt any or several.
6. the making method such as the arbitrary described die cavity foundry goods usefulness core of claim 1-5 is characterized in that: mainly comprise the steps:
(1) draw materials by proportioning: take by weighing each material by following weight part:
30～35 parts of zircon sands, 65～70 parts in fused quartz sand, 30～35 parts of tetraethyl silicate, 5～8 parts in softening agent, 2～3 parts of dispersants;
(2) mix and blend material: first powder stirring 1～2min that proportioning is good, it is mixed, then add successively tetraethyl silicate, softening agent, dispersant, restir 2～3min is until slurry mixes;
(3) demoulding behind the form: slurry is poured in the core mold, leave standstill 5～6min, then die sinking is taken out;
(4) close drying: the dry 2～6h of sealing in encloses container;
(5) roasting: need ladder-elevating temperature during the core roasting: 95～105 ℃ of insulation 30min, 395～405 ℃ of insulation 1h, 600 ℃ of insulation 1h.
7. the method that adopts according to claim 2 the die cavity foundry goods to make core with core and preparation method thereof is characterized in that: the configuration proportion error control of the material in the described step (1) when preparation is between ± 2%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012105014586A CN102976722A (en) | 2012-11-29 | 2012-11-29 | Mould core for cavity casting piece and manufacturing method thereof |
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| CN2012105014586A CN102976722A (en) | 2012-11-29 | 2012-11-29 | Mould core for cavity casting piece and manufacturing method thereof |
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| CN102976722A true CN102976722A (en) | 2013-03-20 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105777114A (en) * | 2016-03-02 | 2016-07-20 | 江苏金汇精铸陶瓷股份有限公司 | Preparation method of water-soluble ceramic core |
| CN107010933A (en) * | 2017-04-01 | 2017-08-04 | 东风精密铸造安徽有限公司 | A kind of slurry preparation method of investment-casting core |
| CN108164257A (en) * | 2017-12-22 | 2018-06-15 | 中山市榄商置业发展有限公司 | A kind of hot investment casting core and its manufacturing method |
| CN109574652A (en) * | 2018-11-26 | 2019-04-05 | 华中科技大学 | A kind of self-curing near net shaping method of easy removal calcium phosphate ceramic type core |
| CN112239369A (en) * | 2020-10-20 | 2021-01-19 | 西安工程大学 | Gradient hollow ceramic core and preparation method thereof |
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| EP1514665A1 (en) * | 2003-09-10 | 2005-03-16 | Palbox Pallets e Contenitori S.p.A. | Method and apparatus for manufacturing large articles having a double wall using a piston to support a mould core |
| CN101537474A (en) * | 2008-03-20 | 2009-09-23 | 上海市机械制造工艺研究所有限公司 | Ceramic core for silica sol precision casting and manufacturing process thereof |
| CN101537473A (en) * | 2008-03-20 | 2009-09-23 | 上海市机械制造工艺研究所有限公司 | Ceramic core for silica sol precision casting and manufacturing process thereof |
| CN102603275A (en) * | 2012-02-09 | 2012-07-25 | 北京昌航精铸技术有限公司 | Preparation method of silicon-based ceramic core |
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2012
- 2012-11-29 CN CN2012105014586A patent/CN102976722A/en active Pending
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| EP1514665A1 (en) * | 2003-09-10 | 2005-03-16 | Palbox Pallets e Contenitori S.p.A. | Method and apparatus for manufacturing large articles having a double wall using a piston to support a mould core |
| CN101537474A (en) * | 2008-03-20 | 2009-09-23 | 上海市机械制造工艺研究所有限公司 | Ceramic core for silica sol precision casting and manufacturing process thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105777114A (en) * | 2016-03-02 | 2016-07-20 | 江苏金汇精铸陶瓷股份有限公司 | Preparation method of water-soluble ceramic core |
| CN107010933A (en) * | 2017-04-01 | 2017-08-04 | 东风精密铸造安徽有限公司 | A kind of slurry preparation method of investment-casting core |
| CN108164257A (en) * | 2017-12-22 | 2018-06-15 | 中山市榄商置业发展有限公司 | A kind of hot investment casting core and its manufacturing method |
| CN109574652A (en) * | 2018-11-26 | 2019-04-05 | 华中科技大学 | A kind of self-curing near net shaping method of easy removal calcium phosphate ceramic type core |
| CN112239369A (en) * | 2020-10-20 | 2021-01-19 | 西安工程大学 | Gradient hollow ceramic core and preparation method thereof |
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Application publication date: 20130320 |