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 casting

Info

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Withdrawn
Application number
FR7702863A
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fata SpA
Original Assignee
Fata SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fata SpA filed Critical Fata SpA
Publication of FR2340158A1 publication Critical patent/FR2340158A1/en
Withdrawn legal-status Critical Current

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.
FR7702863A 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 Withdrawn FR2340158A1 (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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