CN101391280A - Special-shaped salt core for press casting - Google Patents
Special-shaped salt core for press casting Download PDFInfo
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- CN101391280A CN101391280A CNA2007101130178A CN200710113017A CN101391280A CN 101391280 A CN101391280 A CN 101391280A CN A2007101130178 A CNA2007101130178 A CN A2007101130178A CN 200710113017 A CN200710113017 A CN 200710113017A CN 101391280 A CN101391280 A CN 101391280A
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- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention provides a special salt core for pressure casting, which belongs to a salt core used for the pressure casting of piston roughcast, and raw materials for making the salt core include sodium chloride powder, rutile type titanium oxide powder and aluminum oxide powder. The salt core has advantages of high strength, high density and low expansion coefficient after the high-pressure pressing and sintering through adding ceramic materials such as rutile type titanium oxide and aluminum oxide in common salt. The salt core is mainly used for the casting at the pressure of 1MPa to 200MPa, and can also be used for the common casting. Besides the usage for casting aluminum piston roughcast, the salt core can also be used as the core for pressure-casting other non-ferrous alloys.
Description
Technical field
The invention provides a kind of salt core, used salt core during especially a kind of piston blank compression casting.
Background technology
In recent years, more and more stricter both at home and abroad to the requirement of internal combustion engine tail gas discharge, and, cause the temperature in the cylinder also constantly to raise along with the improving constantly of power of IC engine density, also just more and more higher to the performance requirement of the all-aluminium piston on the internal combustion engine.All-aluminium piston is the core component of internal combustion engine, and it directly touches high-temperature fuel gas, has born HTHP, the working environment very severe, and aluminum alloy materials is along with the rising of temperature, mechanical performance constantly reduces.After temperature was elevated to a certain degree, mechanical performances such as the intensity of aluminum alloy materials just can not satisfy the job requirement of engine.In order to address this problem, by after soluble core (using single salt manufacturing) is casted into piston crown more, water dissolves the salt core to people again at piston crown, forms cavity, the cooling duct when working in the future as piston.In engine working process, reach the purpose that reduces piston temperature by spraying into oil in the cooling oil duct of nozzle in piston.For improving the service behaviour under the piston high temperature, when making the diesel engine piston of high-power, high power density, piston blank adopts the compression casting mode, aluminium alloy crystallization under pressure, make crystal grain obtain refinement, thereby improve the intensity fatigue at high temperature performance of piston material particularly under the piston material high temperature.At present, the salt core is mainly made by salt, and the intensity of salt core, density are too low, can not be used for compression casting.
Summary of the invention
Technical problem to be solved by this invention is, a kind of special-shaped salt core for press casting is provided, with the compression casting of the piston blank of realizing having inner cooling path.
The present invention is achieved in that special-shaped salt core for press casting, and by weight percentage, the raw material of making the salt core consists of:
Sodium chloride powder 60-95%
Titanium Dioxide Rutile Top grade powder 3-30%
Alumina powder 2-10%.
This salt core, by adding ceramic materials such as Titanium Dioxide Rutile Top grade, aluminium oxide in salt, behind high pressure compacting and sintering, the intensity height, density is big, the coefficient of expansion is low.It is mainly used in the compression casting of 1Mpa～200Mpa, also can be used for conventional cast.Except that the casting that can be used for aluminum piston blank, also can be used as the core that other non-ferrous alloy compression castings are used.
Description of drawings
Fig. 1 is the vertical view of a kind of salt cored structure of the present invention.
Fig. 2 is half expanded view of the salt core of structure shown in Figure 1.
Fig. 3 is the C-C profile of Fig. 1.
Fig. 4 is the vertical view of another kind of salt cored structure of the present invention.
Fig. 5 is the A-A profile of Fig. 4.
Fig. 6 is the B-B profile of Fig. 4.
The specific embodiment
Further specify the present invention below.
The production method of special-shaped salt core for press casting, described production method is, with granularity is that 30～300 purpose sodium chloride powder, granularity are that 300～400 purpose Titanium Dioxide Rutile Top grade powder and granularity are after 300～400 purpose alumina powders mix, in steel mould, add the pressure compression moulding of 100Mpa～200Mpa, under 700 ℃～740 ℃ temperature, high temperature sintering 4～5 hours is made the salt core again.During high temperature sintering, can adopt the mode of multi-steps sintering.
As shown in Figure 1-Figure 3, the global shape of described salt core is rounded, sees top edge of salt core (1) and lower limb (2) undulate from the side.This is a kind of corrugated special-shaped salt core.The quantity of wave and the angle of crest can be adjusted as required.The global shape of salt core is meant the shape of seeing from vertical view.Crest and trough place should be rounding off.
As Fig. 4-shown in Figure 6, the global shape of described salt core is rounded, and a pair of shape of a saddle projection (3) of symmetry is arranged on the salt core, other part rounding ofves of shape of a saddle projection and salt core, and the lower surface of shape of a saddle projection (5) is a groove surface.This is a kind of saddle-shaped special-shaped salt core, and shape of a saddle bossing forms the oil-in and the oil-out of piston cooling oil duct in the future.
Adopt above-mentioned special-shaped salt core, under the prerequisite that does not influence the piston bulk strength, strengthened the surface area of the inner cooling path of salt core formation, strengthened cooling effect.By finite element analysis and installation experiment, compare with the piston of the inner cooling path of common shape, adopt the piston of the inner cooling path that above-mentioned special-shaped salt core forms, its top and the first annular groove temperature reduce more than 10 ℃, and its bulk strength does not reduce.The salt core of present common shape is generally the identical cylindrical revolving body of cross sectional shape, though simple in structure, easy manufacturing, the inner cooling path surface area that forms is little in the future, and cooling effect is relatively poor.
Through hole (4) is arranged on described shape of a saddle projection (3).Dissolving and flushing that piston blank is made back salt core are convenient in the existence in this hole.
Embodiment 1
By weight percentage, the raw material of making the salt core consists of:
Sodium chloride powder 60%
Titanium Dioxide Rutile Top grade powder 30%
Alumina powder 10%.
Production method is, is that 300 purpose sodium chloride powder, granularity are that 300 purpose Titanium Dioxide Rutile Top grade powder, granularity are after 400 purpose alumina powders mix, in steel mould with granularity, add the pressure compression moulding of 200Mpa, under 740 ℃ of temperature, high temperature sintering 4 hours is made the salt core again.The steel die that adopts has Fig. 1-corrugated core shown in Figure 3 chamber, thereby makes corrugated special-shaped salt core.
Embodiment 2
By weight percentage, the raw material of making the salt core consists of:
Sodium chloride powder 80%
Titanium Dioxide Rutile Top grade powder 15%
Alumina powder 5%.
Production method is, is that 60 purpose sodium chloride powder, granularity are that 400 purpose Titanium Dioxide Rutile Top grade powder, granularity are after 300 purpose alumina powders mix, in steel mould with granularity, add the pressure compression moulding of 100Mpa, under 700 ℃ of temperature, high temperature sintering 5 hours is made the salt core again.The steel die that adopts has Fig. 4-saddle-shaped core shown in Figure 6 chamber, thereby makes saddle-shaped special-shaped salt core.
By weight percentage, the raw material of making the salt core consists of:
Sodium chloride powder 95%
Titanium Dioxide Rutile Top grade powder 3%
Alumina powder 2%.
Production method is with embodiment 1.
Claims (5)
1, special-shaped salt core for press casting is characterized in that, by weight percentage, the raw material of making the salt core consists of:
Sodium chloride powder 60-95%
Titanium Dioxide Rutile Top grade powder 3-30%
Alumina powder 2-10%.
2, the production method of special-shaped salt core for press casting as claimed in claim 1, it is characterized in that, described production method is, with granularity is that 30～300 purpose sodium chloride powder, granularity are that 300～400 purpose Titanium Dioxide Rutile Top grade powder and granularity are after 300～400 purpose alumina powders mix, in steel mould, add the pressure compression moulding of 100Mpa～200Mpa, again under 700 ℃～740 ℃ temperature, high temperature sintering 4～5 hours is made the salt core.
3, special-shaped salt core for press casting as claimed in claim 1 is characterized in that, the global shape of described salt core is rounded, sees top edge of salt core (1) and lower limb (2) undulate from the side.
4, special-shaped salt core for press casting as claimed in claim 1, it is characterized in that the global shape of described salt core is rounded, a pair of shape of a saddle projection (3) of symmetry is arranged on the salt core, other part rounding ofves of shape of a saddle projection and salt core, the lower surface of shape of a saddle projection (5) is a groove surface.
5, special-shaped salt core for press casting as claimed in claim 4 is characterized in that, through hole (4) is arranged on described shape of a saddle projection (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710113017 CN101391280B (en) | 2007-09-18 | 2007-09-18 | Special-shaped salt core for press casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710113017 CN101391280B (en) | 2007-09-18 | 2007-09-18 | Special-shaped salt core for press casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101391280A true CN101391280A (en) | 2009-03-25 |
| CN101391280B CN101391280B (en) | 2011-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710113017 Expired - Fee Related CN101391280B (en) | 2007-09-18 | 2007-09-18 | Special-shaped salt core for press casting |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102985675A (en) * | 2010-07-08 | 2013-03-20 | 马勒国际公司 | Method for producing a cylinder for a two-stroke engine and casting core therefor |
| 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 |
| CN104353814A (en) * | 2014-10-28 | 2015-02-18 | 山东滨州渤海活塞股份有限公司 | Method for manufacturing alumina fiber and titanium oxide particle-reinforced inner-cooling insert ring piston blanks |
| CN108994262A (en) * | 2018-08-30 | 2018-12-14 | 湖南江滨机器（集团）有限责任公司 | Cooling oil duct salt core sintering method in a kind of aluminum piston |
| CN110773705A (en) * | 2018-07-12 | 2020-02-11 | 北京三未科技发展有限公司 | Salt core of engine piston and preparation and application methods thereof |
| CN112893780A (en) * | 2019-11-19 | 2021-06-04 | Mh技术开发有限公司 | Multi-core and method of manufacturing hollow product using the same |
| CN116274878A (en) * | 2023-03-03 | 2023-06-23 | 九牧厨卫股份有限公司 | Salt core material, salt core for titanium alloy casting and preparation method of salt core |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104399865B (en) * | 2014-12-01 | 2016-08-24 | 湖南江滨机器（集团）有限责任公司 | A kind of water-soluble graphite complex salt core material, graphite complex salt core and preparation method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4446906A (en) * | 1980-11-13 | 1984-05-08 | Ford Motor Company | Method of making a cast aluminum based engine block |
| KR20000006623A (en) * | 1999-07-06 | 2000-02-07 | 이인호 | A method for manufacturing a disintegrative core for a high pressure casting, a core and a method for extracting the core |
| CN1994615B (en) * | 2006-12-11 | 2010-12-01 | 东风汽车有限公司 | Salt core of engine piston |
-
2007
- 2007-09-18 CN CN 200710113017 patent/CN101391280B/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102985675A (en) * | 2010-07-08 | 2013-03-20 | 马勒国际公司 | Method for producing a cylinder for a two-stroke engine and casting core therefor |
| CN102985675B (en) * | 2010-07-08 | 2016-04-27 | 马勒国际公司 | Manufacture and be used for the method for cylinder of two stroke engine and the type heart for the method |
| 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 |
| CN103722121B (en) * | 2014-01-08 | 2016-06-29 | 湖南江滨机器（集团）有限责任公司 | A kind of phosphate composite material and preparation method thereof and salt core |
| CN104353814A (en) * | 2014-10-28 | 2015-02-18 | 山东滨州渤海活塞股份有限公司 | Method for manufacturing alumina fiber and titanium oxide particle-reinforced inner-cooling insert ring piston blanks |
| CN110773705A (en) * | 2018-07-12 | 2020-02-11 | 北京三未科技发展有限公司 | Salt core of engine piston and preparation and application methods thereof |
| CN108994262A (en) * | 2018-08-30 | 2018-12-14 | 湖南江滨机器（集团）有限责任公司 | Cooling oil duct salt core sintering method in a kind of aluminum piston |
| CN112893780A (en) * | 2019-11-19 | 2021-06-04 | Mh技术开发有限公司 | Multi-core and method of manufacturing hollow product using the same |
| CN112893780B (en) * | 2019-11-19 | 2022-11-29 | Mh技术开发有限公司 | Multi-core and method of manufacturing hollow product using the same |
| CN116274878A (en) * | 2023-03-03 | 2023-06-23 | 九牧厨卫股份有限公司 | Salt core material, salt core for titanium alloy casting and preparation method of salt core |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101391280B (en) | 2011-02-09 |
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Effective date of registration: 20170726 Address after: 256600 No. twenty-one, No. 569, Bohai Road, Shandong, Binzhou Patentee after: BINZHOU BOHAI PISTON Co.,Ltd. Address before: 256600 No. twenty, No. 999, Bohai Road, Shandong, Binzhou Patentee before: SHANDONG BINZHOU BOHAI PISTON Co.,Ltd. |
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Granted publication date: 20110209 Termination date: 20210918 |
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