EP1570930A1 - Dispositif de coulée où le métal à l'état fondu est distribué d'une zone de fusion à une zone de maintien en particulier un dispositif à basse pression - Google Patents

Dispositif de coulée où le métal à l'état fondu est distribué d'une zone de fusion à une zone de maintien en particulier un dispositif à basse pression Download PDF

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Publication number
EP1570930A1
EP1570930A1 EP04004683A EP04004683A EP1570930A1 EP 1570930 A1 EP1570930 A1 EP 1570930A1 EP 04004683 A EP04004683 A EP 04004683A EP 04004683 A EP04004683 A EP 04004683A EP 1570930 A1 EP1570930 A1 EP 1570930A1
Authority
EP
European Patent Office
Prior art keywords
flow control
control element
molten material
channel
sealing seat
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Withdrawn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
EP04004683A
Other languages
German (de)
English (en)
Inventor
Giuseppe Garabello
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.)
Idra SRL
Teksid Aluminum SRL
Original Assignee
IDRA CASTING MACHINES SpA
Teksid Aluminum SRL
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 IDRA CASTING MACHINES SpA, Teksid Aluminum SRL filed Critical IDRA CASTING MACHINES SpA
Priority to EP04004683A priority Critical patent/EP1570930A1/fr
Publication of EP1570930A1 publication Critical patent/EP1570930A1/fr
Withdrawn legal-status Critical Current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
    • B22D18/04—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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like

Definitions

  • the present invention relates to an apparatus for feeding molten material from the melting area to the holding area in casting apparatuses, particularly apparatuses using a low-pressure process.
  • Apparatuses that use melting furnaces connected by means of closed channels to unpressurized holding furnaces are known among the various types of apparatus for die-casting metal by melting it and subsequently pressure-casting the molten metal inside the die.
  • the metal alloy is drawn from the holding furnaces, typically at atmospheric pressure, by means of cup-like containers that are dipped into the metal bath by means of an appropriately provided opening formed in the structure of the holding furnace, and is then injected into the die by means of injectors.
  • the holding furnace is in fact associated with a casting machine which, by means of the pressurization of the furnace, allows the molten metal to rise inside the solidification die, which is at a lower pressure.
  • This rise occurs by means of casting tubes that dip into the molten metal in a lower region and are connected to the die in an upper region.
  • Such machine at each casting cycle, repeats the pressurization until the amount of molten material in the furnace is sufficient for casting.
  • the operations for pouring and transferring the molten metal into the holding furnace cause regassing, foaming and oxidation of the molten material.
  • the aim of the present invention is to provide an apparatus for feeding molten material from the melting area to the holding area in casting apparatuses, particularly apparatuses using a low-pressure process, that solves the problems noted in known types of casting apparatus.
  • an object of the present invention is to provide an apparatus for feeding molten material from the melting area to the holding area in casting apparatuses, particularly apparatuses using a low-pressure process, that allows to automate the operations of the casting process by using a holding furnace that can be pressurized.
  • Another object of the present invention is to provide an apparatus for feeding molten material from the melting area to the holding area in casting apparatuses, particularly apparatuses using a low-pressure process, that solves the logistic problems linked to filling the holding furnaces.
  • Another object of the present invention is to provide an apparatus for feeding molten material from the melting area to the holding area in casting apparatuses, particularly apparatuses using a low-pressure process, that eliminates the risks linked to operations for pouring and transferring the molten metal into the casting apparatuses.
  • Another object of the present invention is to provide an apparatus for feeding molten material from the melting area to the holding area in casting apparatuses, particularly apparatuses using a low-pressure process, that maintains a constant level of molten metal in the holding furnace for each casting cycle.
  • Another object of the present invention is to provide an apparatus for feeding molten material from the melting area to the holding area in casting apparatuses, particularly apparatuses using a low-pressure process, that can be manufactured with known systems and technologies.
  • an apparatus for feeding molten material from the melting area to the holding area in casting apparatuses comprising at least one heated channel for feeding molten material from at least one melting furnace to at least one pressurizable holding furnace, said holding furnace being associable by way of casting means with at least one die, characterized in that it comprises at least one valve for closing the feed between said at least one channel and said at least one holding furnace.
  • an apparatus for feeding molten material from the melting area to the holding area in casting apparatuses is generally designated by the reference numeral 10.
  • the flow of molten metal 14 between the melting furnace 11 and the channel 12 occurs by means of a pump 12a.
  • First level sensors 12b are provided within the channels 12.
  • the channel 12 is heated by way of per se known heating means, which are not shown in the figures.
  • the pressurizable holding furnace 15 is associated, by way of casting means, for example casting tubes 16, with a die (not shown in the figures).
  • the casting tubes 16 have their inlet 16a immersed in the molten metal of the holding furnace 15.
  • a closure valve 17 is arranged between the heated channel 12 and the holding furnace 15.
  • Such closure valve 17 comprises a flow control element 18, which is associated with a translational actuator 19, which in this embodiment corresponds to a pneumatic cylinder and allows the flow control element 18 to perform a translational motion at right angles to the outflow section of the molten material 14 through said valve.
  • the flow control element 18 is connected to the translational actuator 19 by means of a cylindrical stem 20.
  • Said outflow section substantially coincides with the sealing seat 21 with which the flow control element 18 mates.
  • the sealing seat 21 has a circular cross-section that matches the transverse cross-section of the part 18a of the flow control element 18 that mates with the seat 21.
  • the flow control element 18 can perform a translational motion from a position that is substantially spaced from the sealing seat 21 to a position for mating with the seat 21; in any case, the flow control element 18 remains constantly in contact with the molten metal 14 both when the valve 17 is open and when it is closed.
  • the flow control element 18, moreover, is associated with an axial rotation actuator 22, which in this embodiment consists of a pneumatic cylinder that is arranged horizontally and is associated with kinematic means.
  • Such kinematic means are constituted, in this embodiment, by spherical joints (not shown in the figures), which act between the cylinder and the flow control element and between the cylinder and the base structure to which it is coupled, and allow to convert the linear motion of the pneumatic cylinder into a circular motion.
  • the axial rotation actuator 22 allows the flow control element 18 to rotate about its own stem 20 when it is inserted in the sealing seat 21.
  • both the flow control element 18 and the sealing seat 21 are made of ceramic material.
  • Such automated opening/closure means are constituted by second level sensors (not shown in the figures) for detecting the level of the molten metal inside the holding furnace 15.
  • the second level sensors are functionally connected to an electronic control and actuation unit (not shown in the figures), which in turn is associated with the translational actuators 19 and with the rotational actuators 22.
  • the molten material typically a metal alloy, is fed or melted inside the melting furnace 11 and sent to the pressurizable holding furnace 15 along the heated channels 12 by means of the pump 12a, which is managed automatically by the first level sensors 12b.
  • the melting furnace 11 feeds the channel 12 by means of the pump 12a and keeps its level constant.
  • the flow control element orders the rotational actuator 22 to make the flow control element perform a plurality of partial rotations (for example rotations through approximately 45° alternated in clockwise/counterclockwise directions) while it is mated with the seat 21 with a slight pressure.
  • the seat 21 is cleaned and the flow control element settles in an optimum manner on the seat 21.
  • the valve is then closed further by increasing the closure pressure of the flow control element 18 on the seat 21.
  • the holding furnace 15 is then pressurized and the molten material contained inside it can rise through the casting tubes 16 into the die, which is at a lower pressure, where solidification occurs.
  • the air or gas used to pressurize the furnace 15 is discharged and the valve 17 can be reopened.
  • the molten material resumes flowing from the channel 12 toward the holding furnace 15, which is thus returned to the level for injection into the die.
  • the optimum level inside the channel 12 is maintained by means of the pump 12a and the first level sensors 12b.
  • the lower part of the flow control element 18 is always in contact with the molten material, so as to avoid thermal shocks.
  • the present invention provides an apparatus for feeding molten material from the melting area to the holding area in casting apparatuses, particularly apparatuses using a low-pressure process, that reduces surface oxidation of the molten material that flows within the closed channels.
  • the present invention provides an apparatus for feeding molten material from the melting area to the holding area in casting apparatuses, particularly apparatuses using a low-pressure process, that ensures a constant temperature along the entire path of the molten material.
  • the present invention provides an apparatus for feeding molten material from the melting area to the holding area in casting apparatuses, particularly apparatuses using a low-pressure process, that allows to automate the operations for filling the pressurizable holding furnace, allowing a "continuous" feed and thus solving the logistic problems linked to the filling of holding furnaces.
  • the molten material is fed to the pressurizable furnace cyclically, without manual interventions, substantially by using the automatic system that actuates the valve that closes the feed between the channel and the holding furnace.
  • the present invention provides an apparatus for feeding molten material from the melting area to the holding area in casting apparatuses, particularly apparatuses using a low-pressure process, that eliminates the risks linked to the operations for pouring and transferring the molten metal in said apparatus.
  • the materials employed may be any according to requirements and to the state of the art.
EP04004683A 2004-03-01 2004-03-01 Dispositif de coulée où le métal à l'état fondu est distribué d'une zone de fusion à une zone de maintien en particulier un dispositif à basse pression Withdrawn EP1570930A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04004683A EP1570930A1 (fr) 2004-03-01 2004-03-01 Dispositif de coulée où le métal à l'état fondu est distribué d'une zone de fusion à une zone de maintien en particulier un dispositif à basse pression

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04004683A EP1570930A1 (fr) 2004-03-01 2004-03-01 Dispositif de coulée où le métal à l'état fondu est distribué d'une zone de fusion à une zone de maintien en particulier un dispositif à basse pression

Publications (1)

Publication Number Publication Date
EP1570930A1 true EP1570930A1 (fr) 2005-09-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP04004683A Withdrawn EP1570930A1 (fr) 2004-03-01 2004-03-01 Dispositif de coulée où le métal à l'état fondu est distribué d'une zone de fusion à une zone de maintien en particulier un dispositif à basse pression

Country Status (1)

Country Link
EP (1) EP1570930A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006040256A1 (de) * 2006-08-28 2008-03-06 Ing. Rauch Fertigungstechnik Gmbh Niederdruck-Giessverfahren und Vorrichtung hierfür
DE102018001777A1 (de) 2018-03-06 2019-09-12 Sabrina Maurer Warmhaltezonen in Küchenarbeitsplatten und Verfahren zu deren Herstellung sowie heizbarer Gegenstand, Steuerung, automatischer Temperaturregelung von Warmhaltezonen in Küchenarbeitsplatten
CN110488599A (zh) * 2019-08-22 2019-11-22 安徽枫慧金属股份有限公司 一种炉膛压力控制系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01202343A (ja) * 1987-10-14 1989-08-15 Komatsu Ltd 熱電素子の製造方法
JPH06154992A (ja) * 1992-11-13 1994-06-03 Kobe Steel Ltd Ｍｇ合金低圧鋳造装置
JPH06328229A (ja) * 1993-05-25 1994-11-29 Toshiba Mach Co Ltd 溶湯供給装置
EP0846509A1 (fr) * 1996-12-05 1998-06-10 General Motors Corporation Four à deux chambres pour la coulée contre la gravité

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01202343A (ja) * 1987-10-14 1989-08-15 Komatsu Ltd 熱電素子の製造方法
JPH06154992A (ja) * 1992-11-13 1994-06-03 Kobe Steel Ltd Ｍｇ合金低圧鋳造装置
JPH06328229A (ja) * 1993-05-25 1994-11-29 Toshiba Mach Co Ltd 溶湯供給装置
EP0846509A1 (fr) * 1996-12-05 1998-06-10 General Motors Corporation Four à deux chambres pour la coulée contre la gravité

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 500 (M - 891) 10 November 1989 (1989-11-10) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 472 (M - 1667) 2 September 1994 (1994-09-02) *
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 02 31 March 1995 (1995-03-31) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006040256A1 (de) * 2006-08-28 2008-03-06 Ing. Rauch Fertigungstechnik Gmbh Niederdruck-Giessverfahren und Vorrichtung hierfür
DE102018001777A1 (de) 2018-03-06 2019-09-12 Sabrina Maurer Warmhaltezonen in Küchenarbeitsplatten und Verfahren zu deren Herstellung sowie heizbarer Gegenstand, Steuerung, automatischer Temperaturregelung von Warmhaltezonen in Küchenarbeitsplatten
CN110488599A (zh) * 2019-08-22 2019-11-22 安徽枫慧金属股份有限公司 一种炉膛压力控制系统
CN110488599B (zh) * 2019-08-22 2022-03-01 安徽枫慧金属股份有限公司 一种炉膛压力控制系统

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