US3861457A - Regulating devices for pouring molten metal - Google Patents

Regulating devices for pouring molten metal Download PDF

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Publication number
US3861457A
US3861457A US269074A US26907472A US3861457A US 3861457 A US3861457 A US 3861457A US 269074 A US269074 A US 269074A US 26907472 A US26907472 A US 26907472A US 3861457 A US3861457 A US 3861457A
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Prior art keywords
pressure
furnace
conduit
mould
flow
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Expired - Lifetime
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US269074A
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English (en)
Inventor
Py Alphonse Bl
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Renault SA
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Renault SA
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Publication date
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    • 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
    • B22D18/08—Controlling, supervising, e.g. for safety reasons

Definitions

  • the present invention relates to a device for regulating the pouring of foundry parts, especially of parts poured into chill-moulds following the so-called lowpressure method, in which the metal is introduced into the mould by being expelled from its melting furnace under the action of a gas pressure higher than atmospheric pressure.
  • a method which provides for compensation for this increase of the volume of gas after each injection, by putting into reserve a corresponding quantity of compressed gas to compensate for this increase in volume at each fresh injection, with a view to ensuring a constant of the injection time.
  • the natural elasticity of the gaseous medium which varies with its change of volume, does not allow this method to reach a satisfactory level of accuracy as regards the reproducibility of the conditions of injection.
  • the device forming the object of the present invention enables these functions to be ensured.
  • Control means for the operations of pressurization of the furnace as compared with a pilot reference pressure, this pilot pressure being in turn compared and identified automatically with an adjustable datum pressure, automatically compensated after each injection and insensitive to the conditions of operation of the installation;
  • the originality of the device resides in the use of the physical quantity measurement on which the process of filling of the mould depends, the pressure of the furnace as compared with a reference pressure, for tripping and the control of the supply means of gas under v pressure to the furnace. This measurement by comparipressure.
  • the outer air sucked-in through the conduit 4 passes through a filter 5 and penetrates at a pressure of 3 to 6 bars into the conduits 6 to 11.
  • the datum pressure is given by the water column 13, the height of which is adjusted manually before the first injection, according to the pressure which should exist in the furnace after its charging and following a first injection of metal into the mould.
  • the dry air coming from the conduit 7 passes through a diaphragm regulator 14 which, for safety reasons, reduces its pressure to 800 millibars.
  • the flow-rate of the air is limited by its passage through the throttling device 15 which may advantageously be a SOLEX jet having a flow conversion ratio of 170/100.
  • the air then passes into the conduit 16 which directs it into the leakage regulator 17 and then into the conduit 18 before passing into the space 3 of the furnace, where there is thus ensured a pilot pressure equal to the datum pressure.
  • the air passing out of the conduit 6 passes through a three-way electro-valve 20 and then through a conduit 21 before passing into a dosing pump 22, which is coupled to an air reservoir 23 at atmospheric pressure, known as an accumulator, through a conduit 24.
  • This accumulator into which oil is introduced as soon as the furnace is re-charged after the first injection, has the advantage of avoiding the use of water columns. On the other hand, it necessitates the use of very accurate pressure gauges.
  • the output of the pump 22 is coupled to a separator 25, in which the oil and water are separated by decantation. The bottom of the separator from which the water is collected is in communication with the diaphragm regulator 17 through the conduit 26.
  • a pressure-gauge 28 which communicates by the conduit 29 with the bottom of a closed chamber 30 which is coupled at its upper portion on the one hand by the conduit 31 to the conduit 18 and on the other hand by the conduit 31' to the pressostat 32, the function of which is to shut-off the large delivery after injection of the metal into the mould.
  • the values of the pressure of the furnace can be read-off from the water column 33, which is connected to the chamber 36. This latter is connected at its upper portion to a conduit 37 which opens into the conduit 18.
  • the conduit 31' and the conduit 18 are also coupled to the safety pressostat 33, to the pressostat 34 which closes the small flow-rates, and to the pressostat 35 which closes the large flow-rates.
  • the conduit 8 opens on the one hand into a pressurereducing valve 40, and on the other hand into a pressure-reducing valve 41, at the output of which the air pressure is reduced to 800 millibars.
  • the pressurereducing valve comprises an outlet conduit 42 which opens into a regulator 45 through a conduit 44, and then into a conduit 46 and into a conduit 48.
  • Two throttle devices 50 and 51 respectively of 200 mm. and 100 mm regularize the flow of the air in the conduit 42.
  • the conduit 9 passes through an electro-valve 52 with three ways and then through a two-way electrovalve 53 and finally through an adjustable throttle device 54, before the opening into the conduit 56 coming from the regulator 45, which is connected to the regulator 41 by the conduit 57.
  • the conduit 10 opens into a three-way electro-valve 60 which is connected by a conduit 61 to a two-way electro-valve 62.
  • the conduit 56 opens into the electro-valve 62 after having passed through an adjustable throttle device 64.
  • the conduit 46 opens on the one hand at 65 into the space 3 of the furnace and at 66 into the regulator 68 which is connected by the conduit 69 to the conduit 18.
  • conduit 11 opens into the three-way electro-valve 70.
  • This valve is connected by 71 to the twoway electro-valve 72 which is in communication by conduit 73 with conduits 42 and 48.
  • the operation of the device comprises the following stages:
  • the regulation is then effected by the throttle device 64, the valve 62 and the pressostat 34, or by the regulator 35 and the valve 62.
  • the pressostat 33 ensures the closure of the valves 53 and 62 in the event of failure of a control apparatus.
  • the pressure compensation is automatically effected according to the quantity of metal necessary for each pouring.
  • the distributor 20 actuates the dosing pump 22 which sends a determined quantity of oil into the separator 25, which causes a corresponding rise in the height of the water level in the datum column 13 or, in the case of working on an accumulator.
  • the pump 22 delivers in a similar manner into the accumulator 23, which varies the pressure in consequence, this variation of pressure then actuating the regulator 17 as in the case of regulation by the water column 13.
  • the device utilizing conventional equipment of pneumatic logic, is practically foolproof and is perfectly suitable for operation in the unfavorable surrounding conditions of foundries.
  • the device may be utilized in gravity pouring installations which necessitate an adjustable and reproducible flow-rate, the pouring ladle being placed in a chamber under pressure with an evacuation plunger tube delivering into the pouring system of the mould.
  • This technique is especially applicable to the casting of large parts in light alloys, in sand moulds.
  • the accurate regulation of the flow-rates when pouring makes it possible to simplify the pouring systems for the parts.
  • a regulator device for pouring foundry parts, especially parts poured in chill-moulds following the socalled low-pressure method, in which the metal is introucked into a mould by delivery from a melting furnace under the action of a gaseous pressure higher than atmospheric pressure comprising: first means for controlling the application of pressure to the furnace including first means for comparing the pressure of the furnace with a pilot reference pressure in order to fill the mould, said first controlling means including first means for generating a pilot reference pressure and second means for generating a datum pressure, means for automatically adjusting said datum pressure, and second means for comparing and automatically identifying the pilot reference pressure with the adjustable datum pressure which is automatically adjusted after each injection of molten metal into the mould and unaffected by the conditions of operation of the device; second means, actuated by the comparison pressures, for controlling the supply of filling gas to the furnace with a large flow-rate and for the supply at a small flowrate; means responsive to said second controlling means for opening and shutting-off the flow-rates as a function of differential pressure
  • a device in accordance with claim 1 wherein said means for automatically adjusting includes a column of water having an adjustable height, and further comprising means for reading said datum pressure including a pressure gauge, a closed chamber having a bottom por tion connected to said pressure gauge via a first conduit, and an upper portion connected via a second conduit to a third conduit carrying the pilot pressure, a pressostat, said upper portion being connected via a fourth conduit to said pressostat which closes large flow-rate after injection of the metal into the mold.
  • said first means for generating includes a first diaphragm regulator and a throttle device connected to said first regulator, and said means for comparing said pilot reference and datum pressures includes a second leakage regulator.
  • a device in accordance with claim I further comprising means for reading said furnace pressure including a water column and a chamber having a bottom portion coupled to said water column and an upper pressure gauge via a first conduit. and an upper portion connected via a second conduit to a third conduit carrying the pilot pressure, a pressostat, said upper portion being connected via a fourth conduit to said pressostat which closes large flow-rate after injection ofthe metal into the mold.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
US269074A 1971-07-21 1972-07-05 Regulating devices for pouring molten metal Expired - Lifetime US3861457A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7126657A FR2146148B1 (enrdf_load_stackoverflow) 1971-07-21 1971-07-21

Publications (1)

Publication Number Publication Date
US3861457A true US3861457A (en) 1975-01-21

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US269074A Expired - Lifetime US3861457A (en) 1971-07-21 1972-07-05 Regulating devices for pouring molten metal

Country Status (4)

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US (1) US3861457A (enrdf_load_stackoverflow)
FR (1) FR2146148B1 (enrdf_load_stackoverflow)
GB (1) GB1399914A (enrdf_load_stackoverflow)
IT (1) IT963190B (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4047558A (en) * 1974-06-28 1977-09-13 Honsel Werke Aktiengesellschaft Metering device for metal casting machines, particularly low pressure casting machines
US4741381A (en) * 1986-01-22 1988-05-03 Sintokogio Ltd. Method of and apparatus for automatically controlling pressure in holding furnace incorporated in low pressure die-casting system
US5052468A (en) * 1989-09-20 1991-10-01 Diecasting Machinery & Rebuilding Co. Method and apparatus for die casting shot control
US5913358A (en) * 1993-11-11 1999-06-22 Hi-Tec Metals Ltd. Casting apparatus and method
US20040231822A1 (en) * 1998-11-20 2004-11-25 Frasier Donald J. Method and apparatus for production of a cast component
US20050269055A1 (en) * 1998-11-20 2005-12-08 Frasier Donald J Method and apparatus for production of a cast component

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2460170A1 (fr) * 1979-07-04 1981-01-23 Etude Dev Metallurg Procede et dispositif d'automatisation d'un cycle de coulee sur machine basse-pression
DE3170075D1 (en) * 1981-01-05 1985-05-30 Edem Etude Dev & Metallurg Process and means for the automation of a low pressure casting cycle
US4585050A (en) * 1981-01-05 1986-04-29 Etude Et Developpement En Metallurgie, E.D.E.M., S.A.R.L. Process for automatic regulation of a casting cycle
CS91991A2 (en) * 1990-04-04 1991-11-12 Monks James Herbert Method of molten metal's flow regulation and device for this method realization

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2847739A (en) * 1951-07-12 1958-08-19 Griffin Wheel Co Casting apparatus
US3385473A (en) * 1965-09-22 1968-05-28 Forcesi Guido Oppi Device for delivering metered amounts of molten metal, by means of a variable capacity air-or other gas-container
US3425483A (en) * 1966-05-13 1969-02-04 Amsted Ind Inc Means for controlling casting
US3459254A (en) * 1966-12-27 1969-08-05 Amsted Ind Inc Pressure pouring control arrangement
US3650313A (en) * 1968-10-09 1972-03-21 Inst Po Metalloznanie I Tekno Method for the production of castings from alloys of metals and gases

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2847739A (en) * 1951-07-12 1958-08-19 Griffin Wheel Co Casting apparatus
US3385473A (en) * 1965-09-22 1968-05-28 Forcesi Guido Oppi Device for delivering metered amounts of molten metal, by means of a variable capacity air-or other gas-container
US3425483A (en) * 1966-05-13 1969-02-04 Amsted Ind Inc Means for controlling casting
US3459254A (en) * 1966-12-27 1969-08-05 Amsted Ind Inc Pressure pouring control arrangement
US3650313A (en) * 1968-10-09 1972-03-21 Inst Po Metalloznanie I Tekno Method for the production of castings from alloys of metals and gases

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4047558A (en) * 1974-06-28 1977-09-13 Honsel Werke Aktiengesellschaft Metering device for metal casting machines, particularly low pressure casting machines
US4741381A (en) * 1986-01-22 1988-05-03 Sintokogio Ltd. Method of and apparatus for automatically controlling pressure in holding furnace incorporated in low pressure die-casting system
US5052468A (en) * 1989-09-20 1991-10-01 Diecasting Machinery & Rebuilding Co. Method and apparatus for die casting shot control
US5913358A (en) * 1993-11-11 1999-06-22 Hi-Tec Metals Ltd. Casting apparatus and method
US20040231822A1 (en) * 1998-11-20 2004-11-25 Frasier Donald J. Method and apparatus for production of a cast component
US20050269055A1 (en) * 1998-11-20 2005-12-08 Frasier Donald J Method and apparatus for production of a cast component
US20080047679A1 (en) * 1998-11-20 2008-02-28 Frasier Donald J Method and apparatus for production of a cast component
US7343960B1 (en) 1998-11-20 2008-03-18 Rolls-Royce Corporation Method and apparatus for production of a cast component
US20080135204A1 (en) * 1998-11-20 2008-06-12 Frasier Donald J Method and apparatus for production of a cast component
US7418993B2 (en) 1998-11-20 2008-09-02 Rolls-Royce Corporation Method and apparatus for production of a cast component
US7779890B2 (en) 1998-11-20 2010-08-24 Rolls-Royce Corporation Method and apparatus for production of a cast component
US8082976B2 (en) 1998-11-20 2011-12-27 Rolls-Royce Corporation Method and apparatus for production of a cast component
US8851151B2 (en) 1998-11-20 2014-10-07 Rolls-Royce Corporation Method and apparatus for production of a cast component
US8851152B2 (en) 1998-11-20 2014-10-07 Rolls-Royce Corporation Method and apparatus for production of a cast component

Also Published As

Publication number Publication date
FR2146148A1 (enrdf_load_stackoverflow) 1973-03-02
DE2235674B2 (de) 1975-07-10
IT963190B (it) 1974-01-10
DE2235674A1 (de) 1973-02-01
FR2146148B1 (enrdf_load_stackoverflow) 1975-07-11
GB1399914A (en) 1975-07-02

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