前苏联专利SU1757448A3 Method of obtaining casting

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引用文献

法律状态

优先权

专利摘要:
The invention relates to a method for producing cast parts, in particular, from aluminum and its alloys. To do this, immediately after filling the mold in which the polystyrene foam model is installed, and before the solidified part of the metal exceeds 40% by weight, the isostatic gas pressure is applied to the mold and, from less than 15 seconds, it is raised from 0.5 to 1 5 MPa. 1 hp f-ly, 1 tab.
公开号:SU1757448A3
申请号:SU4203752
申请日:1987-11-16
公开日:1992-08-23
发明作者:Гара Мишель
申请人:Алюминиюм Пешинэ (Фирма)；
IPC主号:

专利说明:

The invention relates to a method for casting metal parts on combustible polystyrene foam models, in particular, from aluminum and from its alloys.
The goal is to improve the quality of the casting by preventing the casting of castings through the gas sinks.
The essence of the invention is as follows.
The gasified model of polystyrene foam is placed in a container with a bulk refractory material without a binder. The container is placed in a sealed caisson, equipped with one or more nozzles distributed over its surface and connected to a source of gas under pressure.
After the mold is filled with the molten metal, i.e. when the model is completely destroyed by the metal, the separated vapors are removed by creating a vacuum in the mold. After filling the mold and removing all the gases entering during the combustion of the model, feed the isostatic pressure to the entire mold (using, preferably, a gas that is neutral with respect to
poured metal). The gas pressure must be fast and have a duration of less than 15 seconds so that there is no time for the crystallization to develop too much. The gas pressure is raised to a value of from 0.5 to 1.5 MPa immediately after the mold is filled with metal and before at least 40% of the metal hardens.
Thus, in order to avoid the penetration of the liquid metal through the grains of the bulk filler, the gas pressure increases in time to a selected value (up to 1.5 MPa). Under these conditions, parts from aluminum alloys are obtained which do not contain pores, i.e. have improved density and mechanical characteristics.
The invention can be illustrated using the following example.
Hollow cylindrical bodies with an outer diameter of 45 mm and a wall thickness of 4 mm, containing adjacent ribs and protuberances of 20x20x30 mm, were cast according to the proposed method, according to which after filling the form metalXJ
B, 00
s
scrap and before the hardened part of the metal hardens at least 40%, the gas is supplied with an isostatic pressure of up to 1 MPa per 10 s.
Castings were obtained from two types of alloys: (A-S 7 G 03) chemical composition. %:
Fe 0.20; Si 6.5-7.5; C 0.10; Zn 0.10; MgO 0.25-0.40; Mn 0.10; SIO 0.05; Pb 0.05; Sn 0.05; Tl 0.05-0.20, while the alloy is modified with sodium;
(A-V SGT) chemical composition,%:
Fe 0.35; SI 0.20; C 4.20-5.00; Sn 0.10; Mg 0.15-0.35; Mn 0.10; Ni 0.05; Pb 0.05; Sn 0.05; TIO 0.05-0.30.
The results are shown in the table.
Thus, the method for producing castings from aluminum or its alloys has an improved density and mechanical properties.

权利要求:
Claims (2)
[1]
1. A method of obtaining casting mainly from aluminum and its alloys, including installing a polystyrene foam model in a container with a bulk refractory material without a binder and pouring a metal under gas pressure, characterized in that, in order to improve the quality of casting by preventing the casting from casting through gas shells , metal captives, immediately after filling the mold with metal and before it hardens at least 40% of the metal by weight, the gas pressure
raise to a value of from 0.5 to 1.5 MPa.
[2]
2. A method according to claim 1, characterized in that the gas pressure is raised in less than 15 s.

类似技术:

公开号 | 公开日 | 专利标题

SU1757448A3|1992-08-23|Method of obtaining casting

SI9012042A|1994-12-31|Process for the lost foam casting of metal pieces under controlled pressure

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RU1819185C|1993-05-30|Method of casting of aluminium and its alloys

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US3605858A|1971-09-20|Method for producing a rimming ingot containing a fume-producing ingredient

US1555237A|1925-09-29|Casting ingots

US1547787A|1925-07-28|Shrink-head casing

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SU872022A1|1981-10-15|Casting production method

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SU1166884A1|1985-07-15|Method of producing moulds by vacuum moulding

SU1729684A1|1992-04-30|Method of manufacturing ingots free of head portion

同族专利:

公开号 | 公开日

DK600287D0|1987-11-16|

DK600287A|1988-05-18|

IE59096B1|1994-01-12|

PT86142A|1988-12-15|

EP0274964A1|1988-07-20|

CA1322098C|1993-09-14|

KR880005976A|1988-07-21|

JPS63137564A|1988-06-09|

IE873062L|1988-05-17|

FR2606688A1|1988-05-20|

NO167715C|1991-12-04|

IS1521B|1992-12-15|

PT86142B|1993-08-31|

US5058653A|1991-10-22|

BR8706146A|1988-06-21|

FI875060A|1988-05-18|

NO874769L|1988-05-18|

ES2015320B3|1990-08-16|

NO167715B|1991-08-26|

AT53180T|1990-06-15|

UA5993A1|1994-12-29|

KR910001179B1|1991-02-25|

FI875060A0|1987-11-16|

AU592905B2|1990-01-25|

EP0274964B1|1990-05-30|

AU8124087A|1988-10-06|

IS3282A7|1988-05-18|

MX168448B|1993-05-25|

GR3001011T3|1991-12-30|

JPH0669608B2|1994-09-07|

NO874769D0|1987-11-16|

FR2606688B1|1989-09-08|

DE3762952D1|1990-07-05|

引用文献:

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法律状态:
2005-05-10| REG| Reference to a code of a succession state|Ref country code: RU Ref legal event code: MM4A Effective date: 20031117 |

优先权:

申请号 | 申请日 | 专利标题

FR8616415A|FR2606688B1|1986-11-17|1986-11-17|LOSS FOAM MOLDING PROCESS FOR METAL PARTS|

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