CN102632219A - Method for casting aluminum piston of gasoline engine - Google Patents
Method for casting aluminum piston of gasoline engine Download PDFInfo
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- CN102632219A CN102632219A CN2012101497120A CN201210149712A CN102632219A CN 102632219 A CN102632219 A CN 102632219A CN 2012101497120 A CN2012101497120 A CN 2012101497120A CN 201210149712 A CN201210149712 A CN 201210149712A CN 102632219 A CN102632219 A CN 102632219A
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Abstract
The invention discloses a method for casting an aluminum piston of a gasoline engine. Based on the traditional gravity casting method, the method also comprises the following steps of: adopting powder metallurgy material with good air permeability to manufacture a mould; carrying out optimization and simulation on the structure of the mould and the casting technology by MAGMAsoft solidification simulation analysis software; after moldassembly, introducing inert gas into a mold cavity of the mould before the mould is poured; and carrying out gas pressurization on molten aluminum in the stage of piston solidification. The method further improves the casting quality of the piston, thus providing the aluminum piston of the gasoline engine which is suitable for various complex structures and high in explosion pressure, strength and performance.
Description
Technical field
The present invention relates to a kind of gasoline engine method for casting aluminum piston, relate in particular to a kind of premium-type gasoline machine method for casting aluminum piston.
Background technology
Continuous development along with the petrol engine technology has proposed increasingly high requirement for low emission, low fuel consume and high explosion pressure.In order to satisfy above demand, state outer piston giant such as Mahle, KS etc. have successively carried out the exploitation of car casting for piston new technology and have obtained certain success.The car piston is owing to complex structure, and the wall thickness transition is inhomogeneous, and end face combustion chamber major part all is a casting, and the piston especially big for some explosion pressures, that structure is complicated especially adopts common gravity foundry technology to be difficult to guarantee the total quality of piston.The stability that also can't ensure the quality of products in the casting process.Through my waste product of car piston is analyzed summary, find that the most defective of piston all is at the uneven position of wall thickness transition and casting position, combustion chamber produces.Although carried out the design of steam vent on the mould, can't be controlled effectively in actual production process.For this reason, developing a kind of New Casting Technique solves this problem and is imminent.
Summary of the invention
The present invention institute will be in order to solve present car piston because complex structure; The wall thickness transition is inhomogeneous; The complicated casting of end face combustion chamber; Especially the piston big for some explosion pressures, that structure is complicated especially adopts the very difficult total quality that guarantees piston of common gravity foundry technology, the stability that also can't ensure the quality of products in the casting process, conforming problem; The Foundry Production technology of a kind of high explosion pressure that can be applicable to various labyrinths, high strength, high performance gasoline engine aluminium piston is provided, and further improves the casting method of the castability of piston.
For realizing above-mentioned purpose, the present invention adopts following technical scheme: theoretical in conjunction with aluminium casting for piston consecutive solidification on traditional casting technique basis, New Casting Technique of the present invention has been proposed.This new technology mainly uses MAGMAsoft casting solidification simulation softward that mould structure and casting technique are optimized design; The application of inert gas shielding, low pressure casting and powder metallurgy new die material through casting process; Reasonability and cast, the stability of process of setting, the reliability of mould, technology have been guaranteed; Further improve the inside and the presentation quality of piston, adapted to the abominable condition of work of engine piston.
Gasoline engine method for casting aluminum piston of the present invention on the basis of traditional gravity casting method, also comprises the steps:
(1) the powdered metallurgical material processing mold of employing good permeability;
(2) through MAGMAsoft solidification simulation analysis software mould structure and casting technique are optimized simulation;
(3) behind the mould matched moulds, the cast before to mold cavity filling inert gas;
(4) in the piston solidification stages aluminium liquid is carried out gas pressurized.
As further improvement of the present invention, external mold is provided with inert gas import.
Seam ring mould cylindrical increases maze trough.
The backform mould has adopted split type backform.
In order to realize the automation of casting process; Guarantee the stable of process, casting machine is transformed, increased functions such as automatic casting machinery hand, inert gas shielding automatically, automatic pressurization; This casting machine can be monitored mold temperature in real time, guarantees consecutive solidification.
The invention has the beneficial effects as follows the castability that can further improve piston, a kind of high explosion pressure, high strength, high performance gasoline engine aluminium piston that can be applicable to various labyrinths is provided.
The specific embodiment
Below in conjunction with embodiment the present invention is described further.
According to my high-end piston of gasoline engine design feature newly developed in recent years, finally confirm on the basis of original gravity foundry technology, to combine the advantage of the full-automatic casting machine of HZJ-80 to carry out process exploitation.
The gasoline engine method for casting aluminum piston of present embodiment; Use full-automatic casting machine; Make piston all realize automation from being poured into the whole process of depanning; Thereby guaranteed the stability and the uniformity of casting process, improved production efficiency, alleviated labor strength, guaranteed the security of whole casting process.External mold is provided with inert gas import in addition, guarantees that extraneous inert gas gets into mold cavity smoothly.Mould comprises backform and external mold.Seam ring mould cylindrical increases maze trough, helps inert gas and upwards fills up mold cavity along maze trough from mold bottom gradually.The backform mould has adopted split type backform, guarantees that the consumable accessory replacing is convenient, and Mould Machining is simple.The backform material is the ventilative steel of powder metallurgy.
The gasoline engine method for casting aluminum piston of present embodiment, the casting step is following: on the SMIS, on the core of big limit, external mold closes, logical inert gas, backform close, aluminium liquid is prepared to ladle out by robot, prepare cast, inert gas stops, pour into a mould, pour into a mould begin pressurization after finishing, pressurize stop, cooling procedure, die sinking, manipulator get alive, clear up mold cavity, begin next circulation.
The pressure of inert gas is 0.2～0.6Mpa, and guard time 5～8 seconds begins to feed inert gas behind the matched moulds, and the feeding time is 6 seconds.Low pressure casting pressure is 0.06～0.2Mpa, and the dwell time is 15～25 seconds, and 2～8 seconds began to pressurize after cast finished.
Through MAGMAsoft solidification simulation analysis software mould structure and casting technique are optimized simulation, have guaranteed the reasonability and the accuracy of mould design and technological design.Improve product quality, shortened mould design, technological design cycle, improved design, experiment success rate.
Contact when guaranteeing that aluminium liquid flows in the casting process in mold cavity and produce oxide, mould structure is improved increase inert gas shielding system with air.Promptly behind the mould matched moulds, mold cavity is carried out the filling inert gas before the cast, utilize big, the inactive characteristics of inert gas density, the air in the mold cavity is discharged, cast aluminum liquid then, thus reduce the oxidation of aluminium liquid, the internal soundness of raising piston.
Can obtain dense microstructure and better metallographic structure in order to ensure piston, aluminium liquid carried out gas pressurized, aluminium liquid is solidified under pressure state, make piston dense structure in the piston solidification stages, the metallographic refinement, thus further improve the mechanical performance of piston.
For guaranteeing that mold top has air permeability and good and good forming ability; Mold materials is improved; Adopt the powdered metallurgical material processing mold of good permeability; Eliminated the piston complex region and wrapped up in the phenomenon of gas, thereby thoroughly solved casting current mark and micro-crack that the piston of gasoline engine end face exists, guaranteed that piston is inherent, presentation quality.Because this mold materials does not need sprayed coating, therefore need not clear up simultaneously, guarantee stability, the uniformity of blank dimension.
Though above-mentioned specific embodiments of the invention is described; But be not restriction to protection domain of the present invention; One of ordinary skill in the art should be understood that; On the basis of technical scheme of the present invention, those skilled in the art need not pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (8)
1. a gasoline engine method for casting aluminum piston on the basis of traditional gravity casting method, also comprises the steps:
(1) adopt the powdered metallurgical material of good permeability to make mould;
(2) through MAGMAsoft solidification simulation analysis software mould structure and casting technique are optimized simulation;
(3) behind the mould matched moulds, the cast before to mold cavity filling inert gas;
(4) in the piston solidification stages aluminium liquid is carried out gas pressurized.
2. the method for claim 1 is characterized in that, the pressure of inert gas is 0.2～0.6Mpa in the said step (3), and guard time 5～8 seconds begins to feed inert gas behind the matched moulds, and the feeding time is 6 seconds.
3. the method for claim 1 is characterized in that, step (4) mesolow casting pressure is 0.06～0.2Mpa, and the dwell time is 15～25 seconds, and 2～8 seconds began to pressurize after cast finished.
4. the method for claim 1 is characterized in that, said powdered metallurgical material is the ventilative steel of powder metallurgy.
5. method as claimed in claim 4 is characterized in that said mould comprises backform, and backform adopts the ventilative steel of powder metallurgy to make.
6. the method for claim 1 is characterized in that, said mould comprises external mold, and external mold is provided with inert gas import.
7. the method for claim 1 is characterized in that, also is provided with the seam circle on the said mould, has increased maze trough on the seam circle cylindrical.
8. the method for claim 1 is characterized in that, said mould comprises backform, and backform is split type backform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101497120A CN102632219A (en) | 2012-05-15 | 2012-05-15 | Method for casting aluminum piston of gasoline engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101497120A CN102632219A (en) | 2012-05-15 | 2012-05-15 | Method for casting aluminum piston of gasoline engine |
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| CN102632219A true CN102632219A (en) | 2012-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012101497120A Pending CN102632219A (en) | 2012-05-15 | 2012-05-15 | Method for casting aluminum piston of gasoline engine |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105127399A (en) * | 2015-08-25 | 2015-12-09 | 来安县科来兴实业有限责任公司 | Low-pressure casting technology for mounting tube socket of motor train unit brake system |
| CN105478785A (en) * | 2015-11-25 | 2016-04-13 | 芜湖市鸿坤汽车零部件有限公司 | Preparation method of engine piston through powder metallurgy |
| CN106141135A (en) * | 2015-04-24 | 2016-11-23 | 重庆吉科阳机械配件有限公司 | A kind of extrusion process of piston of gasoline engine |
| CN106735083A (en) * | 2016-12-28 | 2017-05-31 | 山东滨州渤海活塞股份有限公司 | A kind of hyperbar casting head prefabricated component enhancing Piston mould |
| CN107649846A (en) * | 2017-09-27 | 2018-02-02 | 安徽海立精密铸造有限公司 | A kind of automobile specified novel piston casting technique |
| CN108927504A (en) * | 2017-05-26 | 2018-12-04 | 辽宁银捷装备科技股份有限公司 | A kind of casting technique of aluminium alloy large-sized engine crankcase part |
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| JPS55136555A (en) * | 1979-04-11 | 1980-10-24 | Hitachi Ltd | Low-pressure casting method |
| CN201179557Y (en) * | 2008-04-16 | 2009-01-14 | 广州市型腔模具制造有限公司 | Air discharge mechanism of mould |
| CN202097393U (en) * | 2011-05-11 | 2012-01-04 | 肇庆本田金属有限公司 | Oxygen-free piston casting device |
| CN202147002U (en) * | 2011-07-29 | 2012-02-22 | 中信戴卡轮毂制造股份有限公司 | Low pressure casting water cooling mould for aluminum wheels |
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2012
- 2012-05-15 CN CN2012101497120A patent/CN102632219A/en active Pending
Patent Citations (4)
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| JPS55136555A (en) * | 1979-04-11 | 1980-10-24 | Hitachi Ltd | Low-pressure casting method |
| CN201179557Y (en) * | 2008-04-16 | 2009-01-14 | 广州市型腔模具制造有限公司 | Air discharge mechanism of mould |
| CN202097393U (en) * | 2011-05-11 | 2012-01-04 | 肇庆本田金属有限公司 | Oxygen-free piston casting device |
| CN202147002U (en) * | 2011-07-29 | 2012-02-22 | 中信戴卡轮毂制造股份有限公司 | Low pressure casting water cooling mould for aluminum wheels |
Non-Patent Citations (4)
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| 《中国优秀硕士学位论文全文数据库》 20051231 陈革 "MAGMA分析软件在铝活塞铸造中的应用" , 第1期 * |
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| 陈革: ""MAGMA分析软件在铝活塞铸造中的应用"", 《中国优秀硕士学位论文全文数据库》, no. 1, 31 December 2005 (2005-12-31) * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106141135A (en) * | 2015-04-24 | 2016-11-23 | 重庆吉科阳机械配件有限公司 | A kind of extrusion process of piston of gasoline engine |
| CN105127399A (en) * | 2015-08-25 | 2015-12-09 | 来安县科来兴实业有限责任公司 | Low-pressure casting technology for mounting tube socket of motor train unit brake system |
| CN105478785A (en) * | 2015-11-25 | 2016-04-13 | 芜湖市鸿坤汽车零部件有限公司 | Preparation method of engine piston through powder metallurgy |
| CN106735083A (en) * | 2016-12-28 | 2017-05-31 | 山东滨州渤海活塞股份有限公司 | A kind of hyperbar casting head prefabricated component enhancing Piston mould |
| CN108927504A (en) * | 2017-05-26 | 2018-12-04 | 辽宁银捷装备科技股份有限公司 | A kind of casting technique of aluminium alloy large-sized engine crankcase part |
| CN108927504B (en) * | 2017-05-26 | 2020-07-17 | 辽宁银捷装备科技股份有限公司 | Casting process of large aluminum alloy engine case part |
| CN107649846A (en) * | 2017-09-27 | 2018-02-02 | 安徽海立精密铸造有限公司 | A kind of automobile specified novel piston casting technique |
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Application publication date: 20120815 |