FR2340158A1 - Low pressure die casting of light metals - using controlled escape of gas from die cavity to prevent porosity in casting - Google Patents
Low pressure die casting of light metals - using controlled escape of gas from die cavity to prevent porosity in castingInfo
- Publication number
- FR2340158A1 FR2340158A1 FR7702863A FR7702863A FR2340158A1 FR 2340158 A1 FR2340158 A1 FR 2340158A1 FR 7702863 A FR7702863 A FR 7702863A FR 7702863 A FR7702863 A FR 7702863A FR 2340158 A1 FR2340158 A1 FR 2340158A1
- Authority
- FR
- France
- Prior art keywords
- gas
- die cavity
- casting
- molten metal
- die
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
- B22D27/13—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of gas pressure
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Light metals are cast at low pressure in a die cavity with a cross-section changing with a height; molten metal in a chamber (1) is forced by a constant gas pressure (P1) into a runner with ingates leading to the base of the die cavity, which has a top air vent channel. To prevent porosity in the casting, the air vent channel is connected to a second gas source with pressure (P2) which is initially at least equal to P1; molten metal is then fed towards the die and P2 is reduced to below P1 and then altered to a program so a constant flow of the molten alloy is attached in the parts of the die cavity with different heights. The pref. plant pref. includes air and gas valves with an electronic master controller fitted with a memory store contg. the desired program of gas pressures, and actuating a reversible motor driving a main valve. The molten metal or alloy rises at the optimum speed in each part of the die cavity so turbulence of the melt is avoided and air, gas or vapour can escape without being trapped in the mould, thereby causing blowholes, pores etc.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT6725676A IT1065981B (en) | 1976-02-04 | 1976-02-04 | PROCESS AND EQUIPMENT FOR LOW PRESSURE SHELL CASTING OF LIGHT ALLOY PIECES |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2340158A1 true FR2340158A1 (en) | 1977-09-02 |
Family
ID=11300894
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7702863A Withdrawn FR2340158A1 (en) | 1976-02-04 | 1977-02-02 | Low pressure die casting of light metals - using controlled escape of gas from die cavity to prevent porosity in casting |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE2704321A1 (en) |
FR (1) | FR2340158A1 (en) |
IT (1) | IT1065981B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0099104A2 (en) * | 1982-07-14 | 1984-01-25 | Institut Po Metalosnanie I Technologia Na Metalite | Pressure casting process |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0722795B1 (en) * | 1988-07-31 | 1998-11-25 | Asahi Tec Corporation | Method and device for casting vehicle wheels |
DE19901705A1 (en) * | 1998-12-28 | 2000-07-06 | Manfred Westermeyer | Light metal pistons, especially for internal combustion engines, are low pressure die cast using nitrogen in a riser pipe to displace air from the die cavity and increasing pressure during piston solidification |
-
1976
- 1976-02-04 IT IT6725676A patent/IT1065981B/en active
-
1977
- 1977-02-02 DE DE19772704321 patent/DE2704321A1/en not_active Withdrawn
- 1977-02-02 FR FR7702863A patent/FR2340158A1/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0099104A2 (en) * | 1982-07-14 | 1984-01-25 | Institut Po Metalosnanie I Technologia Na Metalite | Pressure casting process |
EP0099104A3 (en) * | 1982-07-14 | 1984-02-22 | Institut Po Metalosnanie I Technologia Na Metalite | Pressure casting process |
Also Published As
Publication number | Publication date |
---|---|
IT1065981B (en) | 1985-03-04 |
DE2704321A1 (en) | 1977-08-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |