US3823760A - Low pressure die casting apparatus - Google Patents

Low pressure die casting apparatus Download PDF

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Publication number
US3823760A
US3823760A US00296810A US29681072A US3823760A US 3823760 A US3823760 A US 3823760A US 00296810 A US00296810 A US 00296810A US 29681072 A US29681072 A US 29681072A US 3823760 A US3823760 A US 3823760A
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US
United States
Prior art keywords
die
metal
molten metal
riser tube
inert gas
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.)
Expired - Lifetime
Application number
US00296810A
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English (en)
Inventor
F Bloomfield
G Cooper
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.)
SOAG MACHINERY Ltd
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SOAG MACHINERY Ltd
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 SOAG MACHINERY Ltd filed Critical SOAG MACHINERY Ltd
Application granted granted Critical
Publication of US3823760A publication Critical patent/US3823760A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • ABSTRACT A method of low pressure die casting in which molten metal is forced upwardly from a furnace into a die through a riser tube extending below the level of the molten metal in the furnace by gas pressure applied to the surface of the metal. To avoid the formation of oxides in the metal, an inert gas, heavier than air, is introduced into the riser tube adjacent the die to fill the riser tube above the level of the metal in the furnace.
  • a low pressure die casting apparatus which includes an apertured cap on the riser tube for engagement with the sprue orifice, the cap being provided with an inlet for an inert gas.
  • molten metal is forced upwardly from a furnace into a die through a riser tube extending below the level of the molten metal in the furnace.
  • the molten metal is fed to the die by applying gas pressure to the surface of the molten metal in the furnace; the molten metal rising up the riser tube into the die where the metal solidifies The gas pressure is then reduced or removed allowing excess molten metal to return via the riser tube to the furnace following which the die is opened and the casting removed from the die.
  • An object of the present invention is to overcome the disadvantages encountered with present low pressure die casting methods by preventing the generation of metal oxides within the riser tube thereby minimising oxide contamination in the final casting.
  • a further'object of the present invention is to improve the suitability of low pressure die casting methods for light metals and alloys such as magnesium and magnesium alloys.
  • the present invention consists in a method of low pressure die casting, in which molten metal from a closed heated container is conveyed to the die through a riser tube by gas pressure applied to the surface of the metal in said container, one end of which tube extends below the level of the molten metal and the other end of which is in contact relationship with the sprue orifice of the die, wherein an inert gas is introduced into the riser tube adjacent said other end of the riser tube whereby as the molten metal rises up the tube air contained in the die cavity is expelled through vents in the die during charging of the die and as the metal in the riser tube returns to the container on removal of the gas pressure applied to the surface of the metal said inert gas substantially prevents the ingress of air at the interface between said other end of the riser tube and the sprue orifice and fills the space above the metal in the tube.
  • the invention also consists in a low pressure die casting apparatus, comprising a furnace for containing molten metal, a die mounted over the furnace, a sprue orifice in said die, a riser tube having one end extending below the level of the molten metal in the furnace and its other end aligned with the sprue orifice in liquid tight relationship, means for applying gas pressure to the surface of the molten metal in the furnace to force the metal through said tube into the die via the sprue orifice, and means for introducing an inert gas into said tube adjacent said other end of the tube.
  • the die is formed in two halves, the top half 2 of the die being attached to a movable top platen 1 and the bottom half 3 being se cured to a stationary bottom platen 4 and defining with the top half 2 a die cavity 5 of the die.
  • the configuration of the die allows vents 6 to be provided in the mating surfaces between the top and bottom halves 2, 3 of the die.
  • Molten metal 8 in a furnace 9 having a lid 10 is conveyed into the die cavity 5 through a riser tube 11 by gas pressure, introduced through an inlet 12 controlled by a valve 13, acting on the'surface 14 of the molten metal in the furnace 9.
  • the lower end of the riser tube 11 extends below the surface 14 of the molten metal in the furnace 9 whilst the upper end of the riser tube 11 has an apertured riser cap 15 which in use is aligned in liquid tight relationship coaxially with the sprue orifice 7
  • a flexible sealing means in the form of a bellows assembly 16 of heat resistant material is located between the lid 10 of the furnace 9 and a collar 17 of the riser cap 15.
  • the bellows assembly 16 is concentric with the riser tube 11 and may be compressed or expanded by wedge means 18 for sealing the interior of the furnace 9 and the exterior of the upper part of the tube 11 from the ambient.
  • the expansion of the bellows assembly 16 exerts a force on the collar 17 to raise the riser tube 11 and press the upper surface of the riser cap 15 against the sprue orifice 7 to form a liquid tight seal between the riser cap 15 and the sprue orifice 7.
  • Other means may be employed for connecting the riser tube 11 to the sprue orifice 7 omitting the bellows assembly and the wedge actuating mechanism completely.
  • An inlet 1? is provided in the riser cap 15 for introducing an inert gas, heavier than air, into the riser tube 11.
  • a nozzle member 21 which extends axially into the riser tube below the level of the inlet 19.
  • the inlet 19 is controlled by a valve 22.
  • inert gas heavier than air
  • inert gas is continuously introduced, at low pressure into the inlet 19 and fills the cavity within the riser tube 11 above the level 14 of the molten metal 8.
  • the amount of gas introduced is sufficient to make up the leakage through the die vents 6 but not sufficient to cause any turbulence in the riser tube 11.
  • air under pressure is supplied to the furnace 10 via valve 13 and inlet 12, the molten metal 8 is forced up the riser tube 11 pushing the inert gas before it into the die cavity 5 and flushing out air contained in the die cavity, which is vented to the atmosphere through the vents 6.
  • a back pressure is produced in the cavity 23 formed between the internal wall of the riser cap and the exterior wall of the nozzle member 21 which may be used to shut off or reduce the flow of inert gas whilst maintaining a cushion of gas in the cavity 23.
  • the upper die 2 is raised thus providing access for air into the sprue orifice 7.
  • the ingress of air is prevented from entering the riser tube by the inert gas filling the riser tube above the level of the molten metal therein.
  • a control system is incorporated in the system to coordinate the introduction of the inert gas with furnace pressurisation.
  • a signal is'transmitted from control valve 13 to control valve 22 to initiate the flow of inert gas through inlet 19 to scavenge the die cavity 5.
  • a time delay is introduced to allow sufficient time for solidification of the metal casting.
  • valve 13 is closed and the furnace vented to permit the excess molten metal in the riser tube 11 to fall by gravity back into the furnace, the inert gas meanwhile continuing to be introduced to fill the space above the metal in the tube.
  • the upper platen 1 is raised to allow removal of the upper die 2 and the casting.
  • valve 22 a signal is sent from the platen l to the control valve 22 to actuate the valve 22 to shut-off the supply of inert gas.
  • valve 22 can only be reopened in response to further signal from the control valve 13.
  • an override switch 22a is provided to allow valve ll to be opened independently of control valve 13 when the riser tube 12 is not filled with inert gas, but after the initial operation, the valve 22 is controlled solely by valve 13.
  • the control signals may be electrical signals or fluid pressure signals.
  • a method of low pressure die casting in which molten metal from a closed heated container is conveyed to the die by means of gas pressure applied to the surface of the metal in said container, through a riser tube one end of which extends below the level of the molten metal and the other end of which has an inlet nozzle member in contact relationship with the sprue orifice of the die, said inlet nozzle member extending axially into the riser tube below an inlet for an inert gas which is introduced into said other end of the riser tube adjacent said inlet nozzle member to fill the riser.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
US00296810A 1971-10-18 1972-10-12 Low pressure die casting apparatus Expired - Lifetime US3823760A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4838771A GB1365938A (en) 1971-10-18 1971-10-18 Low pressure die casting method and apparatus therefor

Publications (1)

Publication Number Publication Date
US3823760A true US3823760A (en) 1974-07-16

Family

ID=10448438

Family Applications (1)

Application Number Title Priority Date Filing Date
US00296810A Expired - Lifetime US3823760A (en) 1971-10-18 1972-10-12 Low pressure die casting apparatus

Country Status (13)

Country Link
US (1) US3823760A (fi)
JP (1) JPS4849625A (fi)
AU (1) AU465221B2 (fi)
BE (1) BE790179A (fi)
CA (1) CA965576A (fi)
CH (1) CH550040A (fi)
DE (1) DE2250780A1 (fi)
DK (1) DK129506B (fi)
ES (1) ES407495A1 (fi)
FR (1) FR2156725B1 (fi)
GB (1) GB1365938A (fi)
IT (1) IT972205B (fi)
SE (1) SE389980B (fi)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4907642A (en) * 1987-05-27 1990-03-13 Centre National De La Recherche Scientifique (Cnrs) Chill moulding process, particularly for metals, and apparatus and mold for use therein
GB2290735A (en) * 1994-06-29 1996-01-10 Dansk Ind Syndikat Terminating the casting process after non-gravity casting of moulds
US20050039613A1 (en) * 2001-12-28 2005-02-24 Ikuyasu Kaminaka Heating cooking device
WO2015020704A2 (en) 2013-05-08 2015-02-12 Borgwarner Inc. Process and apparatus for casting titanium aluminide components
US20170113268A1 (en) * 2014-06-26 2017-04-27 Dong Keun Go Device and method for melting and forming metal in vacuum environment
US20170332503A1 (en) * 2014-10-29 2017-11-16 Robert Bosch Gmbh Method for producing electronics housings
CN106270452B (zh) * 2016-08-18 2017-12-26 新昌县云海管业有限公司 一种五金制作用门把手冲压装置
US20190344335A1 (en) * 2018-05-10 2019-11-14 Adolf Hetke Casting system
US11148194B2 (en) 2018-05-10 2021-10-19 Adolf Hetke Casting system
CN113811408A (zh) * 2019-05-14 2021-12-17 弗劳恩霍夫应用研究促进协会 铸造金属的方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3409995C1 (de) * 1984-03-19 1985-03-14 Norsk Hydro Magnesiumgesellschaft mbH, 4300 Essen Steigrohr, insbesondere für eine Niederdruck-Gießvorrichtung
JPS6224850A (ja) * 1985-07-24 1987-02-02 Kobe Steel Ltd 低圧鋳造機の不活性ガス吹込方法及び装置
US5309975A (en) * 1991-10-22 1994-05-10 Hitachi Metals, Ltd. Differential pressure casting process

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1912981A (en) * 1931-04-10 1933-06-06 Dow Chemical Co Method of pressure casting and means therefor
US2210544A (en) * 1938-04-18 1940-08-06 Electric Storage Battery Co Casting
US2997756A (en) * 1956-07-17 1961-08-29 Griffin Wheel Co Method and apparatus for casting ingots
US3727674A (en) * 1969-08-06 1973-04-17 Renault Low-pressure chill-casting devices

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1912981A (en) * 1931-04-10 1933-06-06 Dow Chemical Co Method of pressure casting and means therefor
US2210544A (en) * 1938-04-18 1940-08-06 Electric Storage Battery Co Casting
US2997756A (en) * 1956-07-17 1961-08-29 Griffin Wheel Co Method and apparatus for casting ingots
US3727674A (en) * 1969-08-06 1973-04-17 Renault Low-pressure chill-casting devices

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4907642A (en) * 1987-05-27 1990-03-13 Centre National De La Recherche Scientifique (Cnrs) Chill moulding process, particularly for metals, and apparatus and mold for use therein
GB2290735A (en) * 1994-06-29 1996-01-10 Dansk Ind Syndikat Terminating the casting process after non-gravity casting of moulds
US5636680A (en) * 1994-06-29 1997-06-10 Dansk Industri Syndikat A/S Method and device for terminating the casting process after non-gravity casting of moulds, especially green-sand moulds, particularly with easily oxidable metals or metal alloys
GB2290735B (en) * 1994-06-29 1997-08-06 Dansk Ind Syndikat Method and device for terminating the casting procss after non-gravity casting of moulds
US20050039613A1 (en) * 2001-12-28 2005-02-24 Ikuyasu Kaminaka Heating cooking device
US7308852B2 (en) * 2001-12-28 2007-12-18 Sharp Kabushiki Kaisha Heating cooking device
EP2994256A4 (en) * 2013-05-08 2016-11-30 Borgwarner Inc METHOD AND APPARATUS FOR CASTING TITANIUM ALUMINUM CONSTITUENTS
CN105324196A (zh) * 2013-05-08 2016-02-10 博格华纳公司 用于铸造铝化钛部件的方法和设备
WO2015020704A2 (en) 2013-05-08 2015-02-12 Borgwarner Inc. Process and apparatus for casting titanium aluminide components
US9808861B2 (en) 2013-05-08 2017-11-07 Borgwarner Inc. Process and apparatus for casting titanium aluminide components
US20170113268A1 (en) * 2014-06-26 2017-04-27 Dong Keun Go Device and method for melting and forming metal in vacuum environment
US10086427B2 (en) * 2014-06-26 2018-10-02 Dong Keun Go Device and method for melting and forming metal in vacuum environment
US20170332503A1 (en) * 2014-10-29 2017-11-16 Robert Bosch Gmbh Method for producing electronics housings
US11026339B2 (en) * 2014-10-29 2021-06-01 Robert Bosch Gmbh Method for producing electronics housings
CN106270452B (zh) * 2016-08-18 2017-12-26 新昌县云海管业有限公司 一种五金制作用门把手冲压装置
US20190344335A1 (en) * 2018-05-10 2019-11-14 Adolf Hetke Casting system
US10933465B2 (en) * 2018-05-10 2021-03-02 Adolf Hetke Casting system
US11148194B2 (en) 2018-05-10 2021-10-19 Adolf Hetke Casting system
CN113811408A (zh) * 2019-05-14 2021-12-17 弗劳恩霍夫应用研究促进协会 铸造金属的方法

Also Published As

Publication number Publication date
GB1365938A (en) 1974-09-04
BE790179A (fr) 1973-02-15
FR2156725A1 (fi) 1973-06-01
IT972205B (it) 1974-05-20
CA965576A (en) 1975-04-08
FR2156725B1 (fi) 1978-10-20
AU465221B2 (en) 1975-09-18
AU4761672A (en) 1974-04-26
SE389980B (sv) 1976-11-29
DK129506C (fi) 1975-03-17
JPS4849625A (fi) 1973-07-13
DK129506B (da) 1974-10-21
ES407495A1 (es) 1976-02-01
DE2250780A1 (de) 1973-05-03
CH550040A (de) 1974-06-14

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