EP0055947A1 - Verfahren und Vorrichtung zum Automatisieren eines Niederdruck-Giessvorganges - Google Patents

Verfahren und Vorrichtung zum Automatisieren eines Niederdruck-Giessvorganges Download PDF

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Publication number
EP0055947A1
EP0055947A1 EP81400001A EP81400001A EP0055947A1 EP 0055947 A1 EP0055947 A1 EP 0055947A1 EP 81400001 A EP81400001 A EP 81400001A EP 81400001 A EP81400001 A EP 81400001A EP 0055947 A1 EP0055947 A1 EP 0055947A1
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EP
European Patent Office
Prior art keywords
metal
casting
phase
pressure
phases
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.)
Granted
Application number
EP81400001A
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English (en)
French (fr)
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EP0055947B1 (de
Inventor
Pierre L. Merrien
Pierre A. Merrien
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.)
Etude Et Developpement En Metallurgie Edem A Responsabilite Dite Ltee Ste
Original Assignee
Etude Et Developpement En Metallurgie Edem A Responsabilite Dite Ltee Ste
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 Etude Et Developpement En Metallurgie Edem A Responsabilite Dite Ltee Ste filed Critical Etude Et Developpement En Metallurgie Edem A Responsabilite Dite Ltee Ste
Priority to DE8181400001T priority Critical patent/DE3170075D1/de
Priority to AT81400001T priority patent/ATE12901T1/de
Priority to EP81400001A priority patent/EP0055947B1/de
Priority to IL64628A priority patent/IL64628A/xx
Priority to ZA819025A priority patent/ZA819025B/xx
Priority to AU79155/82A priority patent/AU556579B2/en
Priority to FR8200115A priority patent/FR2497471B1/fr
Priority to FR8205054A priority patent/FR2523882B2/fr
Priority to IN526/DEL/82A priority patent/IN158838B/en
Publication of EP0055947A1 publication Critical patent/EP0055947A1/de
Application granted granted Critical
Publication of EP0055947B1 publication Critical patent/EP0055947B1/de
Expired legal-status Critical Current

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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 metal molds are robust but expensive and therefore reserved for large series.
  • the non-metallic molds have a comparatively low cost. They also have the advantage of having adjustable permeability and allow satisfactory filling of the imprint to be obtained.
  • This low pressure casting technique in inexpensive sand molds is particularly suited to the new needs of the industry, particularly in the aeronautical field, which require the production of medium series of molded parts of high mechanical quality alloy, with fine and defined tolerances.
  • V For the strong values of V, K and therefore V tend towards an asymptotic value.
  • the method according to the invention takes care, in order to impose these characteristics, to take direct account of random disturbances such as the drop in the level of the metal in the mold and gas leaks.
  • Another object of the invention is to propose materials suitable for the implementation of this general process and to describe on the one hand processes and on the other hand devices allowing a rational and automatic development of the process according to the invention .
  • the invention consists in regulating the evolution of the casting cycle according to precise characteristics by means of an automatic pilot acting on the discharge pressure of the metal by means of a valve controlled by this pilot.
  • a pressure variation curve is drawn, leading to rising rates of the metal and to overpressures liable to generate a part of satisfactory metallurgical quality.
  • a cycle divided into eight phases is then chosen.
  • the first three phases correspond to the filling of the mold. It is imposed on the metal, during each of them, a constant elevation speed adapted to the geometry of the part. To do this, a constant pressure discharge variation speed is established during these phases.
  • the first phase corresponds to the step of raising the metal to its level. of rest in the crucible towards the mold and takes place inside a tube opening into the mold.
  • the speed can be quite fast and depends only on the casting machine.
  • the third phase corresponds to the entry of the metal into the casting system of the mold, that is to say the part joining the tube to the mold. This phase is carried out at a variable speed depending on the type of parts.
  • the metal fills the imprint.
  • This phase is possibly divided into sub-phases.
  • the optimal speed is then linked to the geometric shape of the part: thickness and height in particular.
  • the metal must have filled the imprint.
  • four presence detectors notably internal electrodes crossing the walls of the mold or ultrasound transmitter-receiver system located at the part upper part of the feed tube
  • four presence detectors are located at the point where the geometrical steps change and transmit the phase change orders to the pilot.
  • a particular sensor in particular the first encountered by the metal, makes it possible to establish the link between the discharge pressure and the subsequent hammer pressures. To this end, the sensor instructs the pilot, when passing the metal at his height, to record the level of the discharge pressure. Thereafter, the pilot considers only relative pressures by taking, as pressure zero, the value of the measurement recorded during this operation triggered by the sensor.
  • Additional sensors can optionally be used to divide each phase into sub-phases.
  • an overpressure ⁇ P1 is established relative to the pressure level at the end of the filling of the mold. It is carried out for a time AT1.
  • the speed and acceleration of the discharge pressure are chosen so as to avoid water hammer, in order to be able to use fine sand molds.
  • an overpressure AP2 is established for a very short time ⁇ T2.
  • the sum ⁇ P1 + ⁇ P2 represents the presser pressure and must be exerted before the part begins to solidify.
  • ⁇ P1 and AP2 depend on the characteristics of the part and in particular on the nature of the alloy, the thickness, the length and the height.
  • Phase 7 corresponds to maintaining the overpressure. This phase is interrupted by the pilot afterwards. information transmitted by a thermocouple from the end of solidification to the base of the part. This thermocouple is located in the hottest part of the casting system.
  • Phase 8 is the relaxation phase.
  • the second stage or mass production stage can then begin.
  • the only manual operations to be performed are the display of the part reference and possibly the start of the cycle. On these indications alone, the pilot regulates the pouring and the temperature according to the optimal characteristics which he has in memory.
  • the device used in the productive phase can be simplified so as to have only one presence sensor which will be described later.
  • This sensor can be, for example, located at the outlet of the metal riser.
  • the molds are then devoid of sensor. In this case, it is advisable to use this sensor both to interrupt the first phase and to define the reference pressure level of the casting. This reference will take into account the drop in the level of the metal.
  • means are provided in order to be able to produce parts having parts of very small thickness.
  • a depression is created at the end of the interior cavity of the mold intended to form the fine parts of the part.
  • the metal traps a gas bubble in these cavities.
  • the establishment of a vacuum in this cavity is programmed. This action is carried out via a channel passing through the walls of the mold in the area under consideration.
  • This vacuum is provided according to parameters of the same type as those for establishing the overpressure in the furnace. In this case, the flow of the metal is not disturbed by the fineness of the cavities concerned and it is thus possible to obtain in these areas a complete filling with very satisfactory surface finish.
  • This technique therefore consists in establishing, automatically and regulated according to the shapes of the parts, a pressure vacuum in areas of small cross section.
  • means are provided for avoiding: - tering the leakage of liquid metal at the base of the mold. It is indeed necessary to keep the mold in place despite the action of the thrust of the metal directed from bottom to top.
  • FIG. 1 if one is interested in the various organs which constitute the casting machine, one sees a crucible 1 situated inside a sealed furnace 2. This furnace is closed by a fixed cover 3. Inside the crucible is the metal 4. The mold cavity 5 is supplied with liquid metal via the injection tube 6 and the casting system 7. A flow of discharge gas ( air or neutral gas) is introduced into the mold via the conduit 8.
  • the mold shown is suitable for the development stage, it is provided with three metal presence sensors E2, E3 and E4. These presence sensors are electrodes grounded by the passage of metal.
  • a fourth sensor E1 is located fixedly at the upper part of the pipe 6.
  • a system composed of a transmitter is preferably chosen as presence sensor , a receiver, a generator and a wave beam analyzer. The preferred form of this system will be specified in more detail below.
  • thermocouple 10 located 20 mm below the part in the hottest attack of the casting system and d 'a thermocouple 11 located inside the metal crucible.
  • a pressure sensor 12 is placed inside the oven enclosure. The oven is heated by a resistor 13.
  • the central part of the table is equipped at its upper part by twelve dials 24a to 241 and at its lower part by a display dial 25 on which a broken line is materialized intersected by nine small lamps 26a to 26i.
  • a coding wheel 27 At the base of the table are on the left a coding wheel 27, then a three-position switch 28, a switch 29 and a pusher 30 with light display.
  • the four presence sensors E1, E2, E3 and E4, the thermocouples 10 and 11 and the pressure sensor 12 transmit their information to the pilot via cables 31 to 37.
  • the pilot controls the opening and closing the assisted valve 9 via the cable 38 and energizing the resistor 13 via the cable 39.
  • This control consists in imposing on the discharge pressure P the monitoring of the phases of variation whose curve is shown at fi gure 2.
  • the first four phases numbered 1, 2, 3 and 4 correspond to the stages of dynamic evolution of the metal in the mold.
  • Phases 5 and 6 correspond to the establishment of overpressures after filling the cavity with the metal.
  • Phase 7 maintains the overweighting overpressure during solidification.
  • Phase 8 effects the relaxation of the system; during this phase the metal falls back into the crucible.
  • a test consists in imposing precise pressure variation rates during phases 2, 3 and 4 at levels such that the rates of rise of metal in the mold (which are, as we have seen, proportional to them) are established to selected values V2, V3 and V4.
  • the duration T1 and the overpressure P1 of phase 5, as well as the duration T2 and the overpressure P2 of phase 6, are also imposed.
  • V2, V3, V4, P1, T1, P2, T2 are adjusted using the encoder wheels 14 to 20.
  • the temperature T of the metal is also fixed during casting by means of the coding wheel 21. All the fixed values are displayed on the front face of the coding wheels.
  • the pilot takes into account and stores these eight values.
  • the device is started by pressing the switch 30.
  • the assisted valve initially closed, is opened by the pilot.
  • the pressure rises, and the metal initially at rest at its level in the crucible, rises in the tube 6 at a speed fixed during the construction of the machine. It reaches the presence sensor E1. This transmits to the pilot the information of the passage of the metal at its level. The pilot then interrogates the pressure sensor 12. The latter transmits the pressure level indication in the oven. The pilot memorizes this value and will later consider it as reference pressure.
  • Phase 2 then opens.
  • the metal fills the inlet channel into the mold.
  • the pilot will act on the assisted valve so as to effectively establish the speed of variation of discharge pressure which will impose the rate of rise of the metal V2. Most often this speed V2 is lower than the speed V1 of the metal rising in the tube.
  • This phase 2 is interrupted when the metal passes in front of the presence sensor E2. The information is transmitted to the pilot who changes phase.
  • the metal fills the casting system.
  • the pilot then imposes, via the discharge pressure, an elevation speed V3.
  • the metal fills the imprint.
  • the pilot adapts the variations in the discharge pressure so as to raise the metal at speed V4, the metal finally meets the electrode E4 which indicates to the pilot that the metal has completely filled the imprint.
  • the following phases are the overpressure phases.
  • phase 5 the pilot imposes the pressure increase ⁇ P1 during the time ⁇ T1.
  • phase 6 the pilot imposes the pressure increase AP2 during the time AT2.
  • thermocouple 10 analyzes the temperature level in the casting system at the base of the cavity.
  • phase 7 As soon as the temperature reaches the end of the solidification stage, that is to say as soon as the metal is completely solidified in the cavity, the information is transmitted to the pilot. Phase 7 is complete, phase 8 begins, the pilot decompresses the enclosure. The liquid metal goes back down into the crucible.
  • the operator is informed of the rise in the flow rate via the dial 25.
  • the lamps 26a, 26b, ... 26i light up successively after each phase change.
  • the pilot assesses and stores the characteristics which have actually been obtained.
  • the cycle characteristics V2, V3, V4, ⁇ p1, ⁇ T1, ⁇ P2, AT2, the time characteristics t2, ⁇ t3, ⁇ t4 of phases 2, 3 and 4 and the cycle temperature actually obtained are displayed in the dials 24a, 24b, 24c ... 24k.
  • the operator can use them for verification.
  • the pilot's operating rhythm is sequenced by a system of clocks dividing the timescale into successive elementary steps.
  • phase ends are either communicated to him from the outside using presence sensors, or communicated from the 'interior by the durations of phases put in memory and imposing the number of time steps of each phase.
  • the system includes a microprocessor allowing it to perform these four functions and thus achieve complete control of the casting.
  • the device can adapt its pressure control characteristics so as to cast parts from a few centimeters to more than 2.50m with satisfactory and constant precision for each of them.
  • the range within which the pressure will evolve is indicated at the start of each casting using the encoder wheel 22.
  • the pilot divided this pressure range into 2 12 4,096 steps.
  • the precision of the piloting that is to say the finesse with which the pilot follows his theoretical curve, is expressed by the ratio from the jump in the increase in discharge pressure to the duration At of the corresponding time step.
  • the pilot chooses the duration of each step so as to maintain constant precision. These durations vary from 50/1000 of a second for the lowest range to around 200/1000 of a second for the highest range.
  • the parts are observed and their mechanical characteristics evaluated. These tests are repeated several times taking into account the previous tests.
  • the optimal characteristics of the cycle, according to which the part is to be cast are statistically established. They are materialized by the eleven values displayed in 24a, 24b, 24c ... 24k which were obtained following the casting of the part having presented the best mechanical qualities.
  • the operator displays, thanks to the encoder wheel 27, the reference of the part concerned and places the multi-position switch 28 in the recording state.
  • the eleven characteristic values of the casting are then displayed at 27, memorized by the pilot in correlation with the reference of the part displayed at 27.
  • phase 7 is interrupted automatically by order of the thermocouple 10.
  • the switch 29 when the switch 29 is in the "manual" position, the duration D of phase 7 is previously imposed on the casting among the characteristics of the cycle. It is displayed on the coding wheel 23.
  • the value found D is displayed at 241 and memorized among the characteristics to be imposed by the pilot for the series phase.
  • serial stage casting takes place in the same way as trial stage casting.
  • FIG. 4 shows the preferred E1 presence sensor according to the invention. This is of the ultrasonic type. It is composed a generator-decoder assembly 40 external to the system and a probe 41 located inside the fixed plate 42 facing and outside the connecting nozzle 43 and shown on the left part thereof.
  • the generator-decoder assembly 40 emits a signal in the ultrasonic band, this is transmitted to the probe 41 by the conductor 44 and transmitted by the probe.
  • the reflected beam of ultrasound resulting is recovered by the probe 41, transmitted to the assembly 40 via the conductor 45 and analyzed by the decoder.
  • the operation of the apparatus can be shown diagrammatically by means of the curve 4a.
  • the probe emits a beam of ultrasound, the action of which can be shown diagrammatically by the peak E.
  • This beam is first reflected on the left internal part 43a of the connecting nozzle, then crosses the internal channel of the nozzle. by weakening slightly and then is reflected on the right internal face 43b of the same connecting nozzle 43.
  • the operation of the system is represented by the curve 4b.
  • the reflections respectively on the left and right face of the connection nozzle are concretized by the peaks R I 1 and R'2, the emission peak being represented by E '. It is noted that, in this case, the peak R'2 is very weakened compared to the peak R'1. This information is, as before, transmitted to the decoder part of the assembly 40.
  • this decoder During operation, the role of this decoder is to distinguish the arrangements of the type 46a and type 46b casting front. To do this, this decoder has organs capable of distinguishing the resulting peaks of type R2 and of type R'2.
  • the decoder transmits to the pilot 47, via the cable 48, the information concerning the position of the metal relative to the position of the probe.
  • Means are provided and in particular the cable 56 for transmitting pressure indications to the pilot and for enabling him to control the depression in the cavity as the metal advances. These means are of the same type as those described above and used to control the discharge pressure.
  • the pilot slaves in this case a pressure vacuum in order to suck the gas bubble trapped by the metal in the cavity 40 during its evolution and thus allow a good penetration of the metal in all the points of the impression by driving a satisfactory surface condition.
  • An electrode 57 is installed in certain cases to fulfill the role of presence sensor and to initiate the vacuum-pressure phase directed by the pilot. In the series phase, 56 and 57 are deleted and the trips are made by times memorized in the pilot.
  • This device essentially comprises a metal box 58 inside which the cores of a sand mold 59 are positioned. Under the action of the thrust of the metal 60 rising in the mold footprint, the latter supports constraints which tend to raise it with respect to the fixed plate 61. Means are provided for holding it in place. To this end, rules 62 are fixed by keying across the upper surface 63 of the trunk 58. Screws 64, integral with the previous rules apply the mold cores 59 frontally to the base of the trunk by means of shims 65. The mold and the trunk are then secured.
  • bars 67 and 68 transmit a vertical force from top to bottom exerted by the mobile plate 69.
  • Different types of shims 70 and 71 are provided to adapt this system to the different dimensions of molds and chests .
  • FIG. 7 represents a wedging system used in the production stage. It is suitable for successive positioning of molds of different dimensions. To do this, the different molds are hand held in place in boxes 72 or 73 by means of rule-screw-block systems of the type described in FIG. 5.
  • a pair of jacks 74 is integral with the movable plate 69. Means are provided for symmetrically moving these two jacks on either side of the axis of the casting machine. The arrows f1 and f'1 symbolize these movements.
  • the rods 75 are movable vertically relative to each of the jacks and terminate in a shoulder 76. The arrows f2 and f'2 account for these movements.
  • the type of the corresponding part is taken into account by the pilot 40.
  • the latter has in memory the position of the jacks corresponding to the type of the part. It automatically controls, via the motor brain 77 the following movement f1 of the axis of the two jacks so as to bring them opposite the upper range of the two metal boxes.
  • the pilot then orders the deployment of the two jacks 74.
  • the two shoulders 76 press the trunk 73 against the fixed plate 61.
  • the pilot commands the re-entry of the two rods of jacks 75.
  • the mold and the trunk containing the freshly cast part can be removed from the system.
  • the methods described can be adapted to all moldable materials such as magnesium, steel or plastics and that the devices considered can be applied to any pressure casting apparatus.
  • the origin of the movement of the metal caused by a gas flow can completely be replaced by a liquid, a rotating field or an electromagnetic pump. It suffices, in fact, to know the correlation which exists between the height of the metal in the injection tube and the factor which caused its movement. This correlation can in any case be established mathematically or experimentally.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Sorption Type Refrigeration Machines (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Valve Device For Special Equipments (AREA)
  • Control Of Fluid Pressure (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
EP81400001A 1981-01-05 1981-01-05 Verfahren und Vorrichtung zum Automatisieren eines Niederdruck-Giessvorganges Expired EP0055947B1 (de)

Priority Applications (9)

Application Number Priority Date Filing Date Title
DE8181400001T DE3170075D1 (en) 1981-01-05 1981-01-05 Process and means for the automation of a low pressure casting cycle
AT81400001T ATE12901T1 (de) 1981-01-05 1981-01-05 Verfahren und vorrichtung zum automatisieren eines niederdruck-giessvorganges.
EP81400001A EP0055947B1 (de) 1981-01-05 1981-01-05 Verfahren und Vorrichtung zum Automatisieren eines Niederdruck-Giessvorganges
IL64628A IL64628A (en) 1981-01-05 1981-12-22 Process and apparatus of automatic regulation of a casting cycle on low-pressure machine
ZA819025A ZA819025B (en) 1981-01-05 1981-12-30 Process and apparatus for automatic regulation of a casting cycle on low-pressure machien
AU79155/82A AU556579B2 (en) 1981-01-05 1982-01-04 Automatic control of low-pressure casting cycle
FR8200115A FR2497471B1 (fr) 1981-01-05 1982-01-05 Procede et dispositif de regulation automatique d'un cycle de coulee sur machine basse pression
FR8205054A FR2523882B2 (fr) 1981-01-05 1982-03-23 Procede et dispositif de regulation automatique d'un cycle de coulee sur machine basse-pression
IN526/DEL/82A IN158838B (de) 1981-01-05 1982-07-12

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP81400001A EP0055947B1 (de) 1981-01-05 1981-01-05 Verfahren und Vorrichtung zum Automatisieren eines Niederdruck-Giessvorganges

Publications (2)

Publication Number Publication Date
EP0055947A1 true EP0055947A1 (de) 1982-07-14
EP0055947B1 EP0055947B1 (de) 1985-04-24

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ID=8188495

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EP81400001A Expired EP0055947B1 (de) 1981-01-05 1981-01-05 Verfahren und Vorrichtung zum Automatisieren eines Niederdruck-Giessvorganges

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EP (1) EP0055947B1 (de)
AT (1) ATE12901T1 (de)
AU (1) AU556579B2 (de)
DE (1) DE3170075D1 (de)
FR (1) FR2497471B1 (de)
IL (1) IL64628A (de)
IN (1) IN158838B (de)
ZA (1) ZA819025B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2599999A1 (fr) * 1986-06-17 1987-12-18 Renault Dispositif regulateur de coulee, notamment en basse pression

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8320298D0 (en) * 1983-07-27 1983-09-01 Pereira J A T Apparatus for low pressure die-casting of metals
CH666204A5 (de) * 1985-02-18 1988-07-15 Fischer Ag Georg Verfahren und einrichtung zum giessen von magnesiumbehandeltem eisen.

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1257708A (fr) * 1960-02-22 1961-04-07 Griffin Wheel Co Procédé de moulage sous pression et dispositif pour sa mise en oeuvre
FR1307457A (fr) * 1960-12-06 1962-10-26 Schmidt Gmbh Karl Dispositif de commande pour moules de fonderie sous pression
FR1376884A (fr) * 1963-11-19 1964-10-31 Ishikawajima Harima Heavy Ind Appareil pour commander automatiquement la corrélation entre le temps et la pression d'air, notamment pour le moulage en coquille à basse pression
FR2146148A1 (de) * 1971-07-21 1973-03-02 Peugeot & Renault
FR2189150A1 (de) * 1972-06-22 1974-01-25 Peugeot & Renault
FR2276125A1 (fr) * 1974-06-28 1976-01-23 Honsel Werke Ag Dispositif doseur pour machines a couler du metal, en particulier des machines a couler sous basse pression
FR2295808A1 (fr) * 1974-12-24 1976-07-23 Pont A Mousson Procede et installation de coulee sous basse pression en moule en sable
FR2394347A1 (fr) * 1977-06-15 1979-01-12 Novatome Ind Procede et dispositif de regulation d'une operation de coulee basse pression

Family Cites Families (1)

* 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

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1257708A (fr) * 1960-02-22 1961-04-07 Griffin Wheel Co Procédé de moulage sous pression et dispositif pour sa mise en oeuvre
FR1307457A (fr) * 1960-12-06 1962-10-26 Schmidt Gmbh Karl Dispositif de commande pour moules de fonderie sous pression
FR1376884A (fr) * 1963-11-19 1964-10-31 Ishikawajima Harima Heavy Ind Appareil pour commander automatiquement la corrélation entre le temps et la pression d'air, notamment pour le moulage en coquille à basse pression
FR2146148A1 (de) * 1971-07-21 1973-03-02 Peugeot & Renault
FR2189150A1 (de) * 1972-06-22 1974-01-25 Peugeot & Renault
FR2276125A1 (fr) * 1974-06-28 1976-01-23 Honsel Werke Ag Dispositif doseur pour machines a couler du metal, en particulier des machines a couler sous basse pression
FR2295808A1 (fr) * 1974-12-24 1976-07-23 Pont A Mousson Procede et installation de coulee sous basse pression en moule en sable
FR2394347A1 (fr) * 1977-06-15 1979-01-12 Novatome Ind Procede et dispositif de regulation d'une operation de coulee basse pression

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2599999A1 (fr) * 1986-06-17 1987-12-18 Renault Dispositif regulateur de coulee, notamment en basse pression
EP0253692A1 (de) * 1986-06-17 1988-01-20 Regie Nationale Des Usines Renault Steuereinrichtung zum Giessen, insbesondere unter geringem Druck

Also Published As

Publication number Publication date
AU7915582A (en) 1982-07-15
FR2497471B1 (fr) 1987-07-03
EP0055947B1 (de) 1985-04-24
ATE12901T1 (de) 1985-05-15
IL64628A (en) 1986-01-31
ZA819025B (en) 1982-11-24
DE3170075D1 (en) 1985-05-30
AU556579B2 (en) 1986-11-13
FR2497471A1 (fr) 1982-07-09
IN158838B (de) 1987-01-31

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