EP0215153A1 - Installation de la coulée à basse pression pour le moulage en coquille - Google Patents

Installation de la coulée à basse pression pour le moulage en coquille Download PDF

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Publication number
EP0215153A1
EP0215153A1 EP85111856A EP85111856A EP0215153A1 EP 0215153 A1 EP0215153 A1 EP 0215153A1 EP 85111856 A EP85111856 A EP 85111856A EP 85111856 A EP85111856 A EP 85111856A EP 0215153 A1 EP0215153 A1 EP 0215153A1
Authority
EP
European Patent Office
Prior art keywords
pressure
casting
furnace
current value
output signal
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.)
Ceased
Application number
EP85111856A
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German (de)
English (en)
Inventor
Theo Ing. Josupeit
Juan Ing. Erquicia
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.)
Russ-Elektroofen Produktions- & Co KG GmbH
Original Assignee
Russ-Elektroofen Produktions- & Co KG GmbH
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 Russ-Elektroofen Produktions- & Co KG GmbH filed Critical Russ-Elektroofen Produktions- & Co KG GmbH
Priority to EP85111856A priority Critical patent/EP0215153A1/fr
Publication of EP0215153A1 publication Critical patent/EP0215153A1/fr
Ceased 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
    • 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 invention is directed to a low-pressure casting system predominantly for permanent mold casting, in which the casting is carried out by gas pressure on the bath level in the metering chamber of the casting furnace and in which the pressure increase required by the metal outlet from the casting nozzle into the mold does not increase with increasing emptying Metal refill or lowering of a displacement body, for example according to DE 21 28 425 A1, DE 29 50 597 A1, is achieved.
  • a displacement body for example according to DE 21 28 425 A1, DE 29 50 597 A1
  • it is known to supply the pressure directly to the furnace via a signal converter and a volume amplifier.
  • the signal converter gets a fixed prescribed after each casting Value for increasing the pressure, so that as the amount of metal in the furnace decreases, the pressure is increased.
  • a counter starts which, after a set number of castings, depressurises the furnace for refilling. If the furnace is not properly filled at the start of casting, the number of castings is no longer correct or the specified pressure increase is not sufficient to fill all molds properly. On the other hand, if the furnace is filled too high, metal may spurt out of the furnace.
  • the object of the invention was to develop a casting method which restores the same casting conditions after each casting and achieves the necessary pressure increase for the mold filling in the desired time and regardless of the filling level of the furnace.
  • FIG. 1 shows a gas pressure line diagram
  • FIG. 2 shows a current-pressure diagram
  • the main parts of the low-pressure casting system according to the invention are a low-pressure casting furnace, generally designated 1, a mold casting machine, generally designated 2, and a compressed gas duct for the top furnace, which consist of an inlet-closed, generally designated 3 pre-pressure circuit and a generally designated 4 Casting pressure branch is composed.
  • the mold casting machine 2 takes over the function of handling the molds.
  • the core is inserted in a first position, after which the carousel rotates in the direction of the casting furnace 1 into a second position in which the mold 5 is placed on the casting nozzle 6 of the furnace.
  • the Placing the mold automatically increases the casting pressure by means of a magnetic valve and the metal flows into the mold 5.
  • the mold lifts off the furnace and the machine turns to a third position, in which the mold is opened and the casting is ejected.
  • the casting machine then turns to a fourth position, in which the mold is immersed in a finishing bath.
  • the casting furnace 1 has, in addition to the casting nozzle 6, a metering chamber 7 and a filling chamber 8. Both chambers are equipped with pressure-tight lids to avoid pressure losses in the furnace.
  • a separating element for the upstream pressure circuit 3 opposite the casting pressure branch 4 is a membrane 9 in the membrane accumulator 10.
  • the pre-pressure is increased so that metal from the metering chamber 7 into the pouring nozzle 6 flows in and presses the metal in it into the mold 5.
  • the inlet pressure circuit 3, which is closed on the furnace side, can either be supplied via a separate pressure source, for example a nitrogen bottle 11, or via the gas network.
  • a separate pressure source for example a nitrogen bottle 11, or via the gas network.
  • the power line 12 splits in the factory into a pressure accumulator line 13, which leads to the pressure accumulator 14 and into an oven line 15 intended for supplying the upstream pressure circuit, which opens into the closed oven circuit 3.
  • solenoid valves 16a, 16b, 16c for the pressure build-up in the furnace feed line 17 and a solenoid valve 18 for the pressure reduction and an emergency valve 19 for the ventilation.
  • a charging furnace for filling the casting furnace after it has been completely emptied is generally designated by 20.
  • a plurality of solenoid valves 16 can be provided if molds of different shapes, different capacities or with different casting conditions are available for filling on a mold casting machine.
  • An important component of the system according to the invention is an electrical pressure generator, generally designated 25, via which both the admission pressure and the casting pressure are controlled. Its task is to deliver two output currents in a low current range, e.g. from 4 to 20 mA after the presence of certain input signals according to a predetermined pattern, which is set depending on the number of castings in a cycle and the amount of metal for a mold filling and that is, according to the required pressures can be.
  • the pressure generator has several inputs, namely an input for the release signal, without which no pressure may be built up, and for a signal “build up pressure” and “build up pressure”, both for setting the bath level after a furnace has been filled are determined by hand before the first mold filling.
  • the pressure generator also has two outputs, namely an output A1 "pre-pressure” and an output A2 "casting pressure".
  • the setting is made by means of a first potentiometer F3, with which a positive current swing can be set, which is effective as long as the previous enable signal is present.
  • a preselection switch F2 is provided for the operation, with which the number of current strokes set by the size of the potentiometer F3 can be set before the output values increase by the value set by the potentiometer F1.
  • the selector switch F2 has a range from 0 to 9 and is set to 6, the same current stroke will occur six times in a cycle for 6 castings before a new cycle begins and the pressures (pre- and casting pressure) around the value be increased by F1.
  • a new cycle is initiated in that the aforementioned current stroke remains unchanged in its level, but assumes an increased level.
  • This level jump can be set for operation with another potentiometer F1. After each cycle, there is a further level jump of the previously set height, as illustrated by the diagram in FIG. 2.
  • a current value is constantly present at the analog output A1 "pre-pressure" of the pressure generator, which is cyclically around that with the further potentiometer F1 set level jump increased; the current value of the "pre-pressure” output plus the current stroke set with potentiometer F3 is constantly present at the analog output A2 "casting pressure".
  • the same current value is present at the “pre-pressure” output, which current value only increases after the end of a cycle due to the abovementioned level jump.
  • At the "casting pressure” output there is also the same current value for one cycle, which is composed of two constant variables, namely the current value for the admission pressure and the set current stroke.
  • the absolute level of the current level can be increased or decreased gradually, for example in steps of 12.5% of the level jump, for the setting of the bath level by hand. This is done by means of inputs on the pressure generator with the functions "build up pressure” and “reduce pressure", which are controlled by two separate buttons. Each time you press one of these buttons, the values given above are increased or decreased.
  • a compressed gas usually compressed air
  • the press air pressure is displayed on the manometer 28.
  • the volume amplifier 29 located behind the filter in the pressure storage line 13 and 30 in the pre-pressure supply line 22, the factory pressure is reduced depending on the electrical signal output by the pressure generator 25 via the electro-pneumatic transducers 31 and 32, with the casting pressure and via the volume amplifier 29 the volume booster 30 of the form can be set.
  • the difference between the pre-pressure and the casting pressure is always constant and can be set manually on the pressure generator.
  • the casting pressure required for the mold filling is displayed on the manometer 33 in the casting pressure line 34 and the admission pressure required to achieve a constant bath level in the casting nozzle 6 is displayed on the manometer 35.
  • the solenoid valve 21 is actuated via a “casting” pushbutton on the pressure generator, the compressed air flows from the pressure accumulator 14 into the membrane accumulator 10.
  • the influx of the compressed air causes the membrane to be deformed and thus a pressure on the gas volume in the closed furnace circuit 3, the casting pressure, exercised.
  • the gas volume in the closed furnace circuit has a certain admission pressure, for example a maximum of 0.25 bar, and the casting pressure is applied to this gas volume via the speed control valves 36 and the opened solenoid valves 16, so that the metal is pressed into the mold.
  • the metal feed is set beforehand on the casting console using an electronic timer. After this time, the compressed air magnet valve 21 closed and thus the metal supply to the mold interrupted. The previously set holding or solidification time of the metal in the mold expires after a closing of the solenoid valve 21 via a second electronic time clock.
  • the gas volume in the closed furnace circuit 3 that is to say that in the furnace space and membrane accumulator 10 and the feed and discharge lines between them, can either be via a special pre-pressure gas source, e.g. the nitrogen bottle 11 and the associated reducing valve 37 or via the furnace line 15 of the compressed air network can be set as a function of the electronically determined form in the pressure generator, for which purpose the shut-off valves 38 and 39 must be opened and closed accordingly.
  • a special pre-pressure gas source e.g. the nitrogen bottle 11 and the associated reducing valve 37
  • the furnace line 15 of the compressed air network can be set as a function of the electronically determined form in the pressure generator, for which purpose the shut-off valves 38 and 39 must be opened and closed accordingly.
  • the vent valve 24 in the compressed air-side casting pressure branch and the solenoid valve 18 in the furnace discharge line 40 is opened, via which the compressed air escapes from the diaphragm accumulator 10 into the free space and, on the other hand, that Metal in the pouring nozzle falls off.
  • the solenoid valve 24 remains open until the manometer 41 indicates the pressure 0 bar.
  • the pre-pressure is increased by the value Delta P after one cycle. This value is previously set via the potentiometer F1 as a level jump in the current value and a counter, so that after the set cast number has expired, the bath level is automatically adjusted for the following cycle via the analog output A1 "pre-pressure" on the pressure generator.
  • the overall control is protected by the safety pressure valve 42 on the compressed air side, which releases the compressed air flowing out of the pressure accumulator when a set pressure is exceeded.
  • the control is also protected by the compressed air vent valve 24 and the furnace solenoid valve 19, which immediately release the pressure in the event of a power failure or actuation of an emergency button. This ensures that when metal escapes from the mold or pouring nozzle, the metal flow is interrupted immediately when the emergency button is pressed.
  • the maximum permissible pressure in the furnace is set by two contact pressure gauges 43 connected in parallel. When this maximum pressure is reached, the compressed gas escapes automatically and the furnace is depressurized.
  • the casting furnace 1 is empty, this is indicated by the contact manometer 43; all solenoid valves are de-energized and the casting furnace is depressurized.
  • the pressure generator no longer receives an enable signal, which causes it to move to the start position returns and the oven can be refilled.
  • 44 are filters in the furnace discharge line 40 for the pre-pressure gas flowing out of the furnace space.
  • the potentiometer F1 0.5 mA (corresponding to a pressure of 30 mbar)
  • the selector switch F2 2 (castings or current strokes per cycle)
  • the potentiometer F3 3 mA corresponding to 300 mbar).
  • the pressure generator continuously outputs 10 mA at output A1 "pre-pressure” and 13 mA at output A2 "casting pressure".
  • the value of the "casting pressure” output is calculated in the pressure generator from the addition of the "pre-pressure” output and the set value of the potentiometer F3.
  • the signal "pre-pressure” with the current value 10 mA is converted into a pneumatic signal of 100 mbar.
  • the volume amplifiers 30 amplify this signal at the output with the same value but larger volume, which specify the pressure in the furnace via the solenoid valve 23 and the solenoid valve 16.
  • the output A2 "casting pressure" of the pressure generator gives the value 13 mA to the converter 31.
  • There the electrical signal is converted into a pneumatic signal with 400 mbar.
  • a pressure of 400 mbar is produced in the pressure accumulator 14 via the volume booster 29.
  • the solenoid valve 21 is closed, the solenoid valve 24 opened. This means that the line between the solenoid valve 21 and the diaphragm accumulator 10 is depressurized, while it is filled with 100 mbar on the furnace side.
  • the mangle valves 29 and 24 close and at the same time the solenoid valve 21 opens. None changes on the pressure generator.
  • the air from the pressure accumulator 14 flows into the membrane accumulator 10, whereby the pressure in the furnace increases from 100 mbar to 400 mbar.
  • the solenoid valve 21 closes and after the solidification time, the solenoid valve 16 closes and the solenoid valves 18 and 24 open.
  • the air in the furnace escapes into the diaphragm accumulator via the solenoid valve 18; on the compressed air side, the line between the diaphragm accumulator 10 and the solenoid valve 21 is depressurized.
  • the next casting process is the same as the previous one.
  • the value 13.5 mA is set at output A1.
  • the difference between the admission pressure and the casting pressure therefore remains constant, namely 300 mbar or 3 mA as set with F3.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
EP85111856A 1985-09-19 1985-09-19 Installation de la coulée à basse pression pour le moulage en coquille Ceased EP0215153A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP85111856A EP0215153A1 (fr) 1985-09-19 1985-09-19 Installation de la coulée à basse pression pour le moulage en coquille

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85111856A EP0215153A1 (fr) 1985-09-19 1985-09-19 Installation de la coulée à basse pression pour le moulage en coquille

Publications (1)

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EP0215153A1 true EP0215153A1 (fr) 1987-03-25

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EP85111856A Ceased EP0215153A1 (fr) 1985-09-19 1985-09-19 Installation de la coulée à basse pression pour le moulage en coquille

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018202626A1 (fr) 2017-05-03 2018-11-08 Ekw Gmbh Buse de coulée à couronne interchangeable
AT520126A1 (de) * 2017-07-13 2019-01-15 Fill Gmbh Gießvorrichtung zum Gießen unter Druck

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2950597A1 (de) * 1979-12-15 1981-07-02 Russ-Elektroofen Produktions-Gesellschaft mbH & Co KG, 5000 Köln Automatisiertes niederdruckgiessverfahren und vorrichtung zu seiner durchfuehrung
DE3317474A1 (de) * 1983-05-13 1984-11-15 Russ-Elektroofen Produktions-Gesellschaft mbH & Co KG, 5000 Köln Niederdruckgiessverfahren und vorrichtung zu seiner durchfuehrung
DE3316641C2 (de) * 1982-05-14 1984-12-06 Georg Fischer Ag, Schaffhausen Gießform für ein Niederdruckgießverfahren
EP0135305A1 (fr) * 1983-07-27 1985-03-27 A.W. Plume Limited Procédé et appareil pour la coulée de métaux sous basse pression

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2950597A1 (de) * 1979-12-15 1981-07-02 Russ-Elektroofen Produktions-Gesellschaft mbH & Co KG, 5000 Köln Automatisiertes niederdruckgiessverfahren und vorrichtung zu seiner durchfuehrung
DE3316641C2 (de) * 1982-05-14 1984-12-06 Georg Fischer Ag, Schaffhausen Gießform für ein Niederdruckgießverfahren
DE3317474A1 (de) * 1983-05-13 1984-11-15 Russ-Elektroofen Produktions-Gesellschaft mbH & Co KG, 5000 Köln Niederdruckgiessverfahren und vorrichtung zu seiner durchfuehrung
EP0135305A1 (fr) * 1983-07-27 1985-03-27 A.W. Plume Limited Procédé et appareil pour la coulée de métaux sous basse pression

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018202626A1 (fr) 2017-05-03 2018-11-08 Ekw Gmbh Buse de coulée à couronne interchangeable
DE102017109448A1 (de) * 2017-05-03 2018-11-08 EKW Gesellschaft mit beschränkter Haftung Gießdüse mit auswechselbarer Krone
DE202017007133U1 (de) 2017-05-03 2019-09-03 EKW Gesellschaft mit beschränkter Haftung Gießdüse mit auswechselbarer Krone
US11235381B2 (en) 2017-05-03 2022-02-01 Ekw Gmbh Pouring nozzle with a replaceable crown
AT520126A1 (de) * 2017-07-13 2019-01-15 Fill Gmbh Gießvorrichtung zum Gießen unter Druck
AT520126B1 (de) * 2017-07-13 2020-04-15 Fill Gmbh Gießvorrichtung zum Gießen unter Druck

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Inventor name: ERQUICIA, JUAN, ING.