EP2536519B1 - Procédé d´ajustage de la pression dans l´empreinte dans une machine à couler sous pression - Google Patents

Procédé d´ajustage de la pression dans l´empreinte dans une machine à couler sous pression Download PDF

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Publication number
EP2536519B1
EP2536519B1 EP11703128.6A EP11703128A EP2536519B1 EP 2536519 B1 EP2536519 B1 EP 2536519B1 EP 11703128 A EP11703128 A EP 11703128A EP 2536519 B1 EP2536519 B1 EP 2536519B1
Authority
EP
European Patent Office
Prior art keywords
pressure
mold cavity
molten metal
mold
melt
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.)
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Application number
EP11703128.6A
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German (de)
English (en)
Other versions
EP2536519A1 (fr
Inventor
Roberto Boni
Fiorenzo Dioni
Werner HÖFER
Rainer GARY
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
Original Assignee
Idra SRL
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Publication of EP2536519A1 publication Critical patent/EP2536519A1/fr
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/14—Machines with evacuated die cavity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/32—Controlling equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/02—Hot chamber machines, i.e. with heated press chamber in which metal is melted
    • B22D17/04—Plunger machines

Definitions

  • the invention relates to a method for adjusting the mold cavity pressure in a vacuum die casting machine according to the preamble of claim 1.
  • a vacuum die casting machine which has a mold formed from two mold halves, which serves to receive a molten metal.
  • a mold half is stationary, the second mold half is designed to be movable and movable in the direction of the stationary mold half, wherein a peripheral sealing cord is provided on the end face of a mold half for a pressure-tight seal between the mold halves.
  • the mold between the mold halves is connected to a casting chamber in which a casting piston is adjustably mounted. In the casting chamber opens an intake pipe from a holding furnace in which a molten metal is located.
  • the mold cavity between the mold halves, which forms the mold, is connected to an evacuation device for generating a vacuum, which causes a suction of the molten metal from the holding furnace via the intake pipe in the casting chamber.
  • an evacuation device for generating a vacuum, which causes a suction of the molten metal from the holding furnace via the intake pipe in the casting chamber.
  • gas from the mold cavity passes through the casting chamber and the intake pipe into the molten metal, as this would lead to an undesirable inclusion of gas in the melt and a reduction in the quality of the workpiece to be cast.
  • the EP 0 790 090 B1 is provided that is used to prevent gas introduction into the holding furnace during the closing of the casting piston as a shut-off and is moved to a position in which the flow connection is interrupted via the intake pipe in the holding furnace.
  • the casting piston is for this purpose between the mold cavity and the mouth of the intake pipe.
  • the increased volume in the mold cavity can also be derived by releasing a valve into the atmosphere or sucked through the evacuation device.
  • the invention has for its object to avoid with simple measures a gas inclusion in the melt of a vacuum die casting machine.
  • the vacuum die casting machine has a mold having a stationary mold half and a movable mold half, between which a mold cavity is formed, which serves to receive a molten metal.
  • the mold cavity communicates with a casting chamber in which a casting piston is adjustably arranged.
  • molten metal can be introduced, which is displaced by a movement of the casting piston in the mold cavity.
  • an evacuation device is provided for generating a negative pressure in the mold cavity. About the negative pressure molten metal is sucked from a holding furnace in the casting chamber.
  • the movable mold half is moved by means of an adjusting device, in particular by means of a hydraulic actuating cylinder on the stationary mold half.
  • an air volume in the mold cavity is enclosed, whereby an overpressure may arise, extending from the mold cavity via the casting chamber in the molten metal in the holding furnace can propagate, which can lead to gas inclusion in the molten metal.
  • a pressure determining device is provided, via which the mold cavity pressure can be determined.
  • at least one adjusting device is provided, via which the mold cavity pressure can be regulated.
  • the actuator is adjusted as a function of the differential pressure of mold cavity pressure and melt back pressure.
  • the melt back pressure is the pressure that must be overcome in order for gas to be introduced from the mold cavity via the casting chamber into the molten metal.
  • the melt backpressure is measured from the hydrostatic pressure between the mouth of a suction pipe immersed in the molten metal and the level of the molten metal in the holding furnace, taking into account the density of the molten metal. For melt backpressure, there is also the pressure on the molten metal, usually the atmospheric pressure.
  • the differential pressure between mold cavity pressure and melt counterpressure is decisive in open flow communication between the mold cavity and the molten metal, whether the pressure from the mold cavity spreads to the molten metal and there causes air entrapment. If the mold cavity pressure is below the melt back pressure, then despite open flow connection no air gets into the molten metal between the mold cavity and the holding furnace. The risk of introducing air into the molten metal is only at a higher mold cavity pressure compared to the melt back pressure of the molten metal. By adjusting the actuator, the mold cavity pressure is regulated to prevent the melt backpressure from being exceeded.
  • This embodiment has the advantage that the flow connection between the mold cavity and the holding furnace with the molten metal does not have to be interrupted. Therefore, it is not necessary to adjust the casting piston, which is arranged adjustably in the casting chamber, in a position interrupting the flow path. Rather, the casting piston advantageously remains in a retracted position, in which the flow connection between the mold cavity and holding furnace is open.
  • This also has the advantage that the casting piston for the subsequent evacuation process for sucking the molten metal into the casting chamber is in the desired position for introducing the molten metal.
  • the plunger can maintain the retracted position during the delivery of the movable mold half and during the subsequent evacuation process. Only after molten metal has been delivered to the casting chamber, does the casting piston have to promote the melt volume in the casting chamber by advancing it into the mold cavity.
  • the adjusting movement of the adjusting device is the manipulated variable, via which the mold cavity pressure is influenced.
  • the movement of the actuator is, as described above, determined as a function of the differential pressure of mold cavity pressure and melt back pressure.
  • the Actuator are supplied so that it assumes the desired position to achieve the desired mold cavity pressure.
  • the adjusting device is formed by the movable mold half of the mold, wherein the setting speed of the movable mold half is influenced for adjusting the mold cavity pressure.
  • the movable mold half is moved during the delivery process with a predetermined velocity profile, which can be deviated from in order to influence the mold cavity pressure.
  • the mold cavity embracing sealing cord on the opposite end side of the second mold half an air volume between the mold halves is enclosed, with further approximation of the movable mold half to the stationary mold half the risk of overpressure in the mold cavity.
  • the movable mold half is adjusted by means of an actuator, the movement of which is adjusted via control signals of the control device.
  • the actuator is, for example, a hydraulic cylinder.
  • a pressure valve arranged on the mold cavity is provided, via which the mold cavity is connected to the evacuation device.
  • the Pressure valve is at least between an open position, in which the mold cavity is connected to the evacuation device and to adjust a closed position.
  • the pressure valve is designed as a three-way valve which, in addition to the closed position and the position connected to the evacuation device, can be set to a third position in which the mold cavity is connected to the atmosphere.
  • an additional adjustment is available over the influence on the mold cavity pressure can be taken.
  • the mold cavity pressure is detected by means of a pressure detecting device.
  • the pressure-determining device is preferably a pressure sensor which is arranged in or on the mold cavity and via which the mold cavity pressure can be measured directly or indirectly. In principle, however, it is also possible to use a measured-value estimator as the pressure-determining device, via which the pressure is estimated, for example, on the basis of a mathematical model.
  • a desired pressure in the mold cavity is adjusted as a function of the differential mold cavity pressure and the melt back pressure.
  • the setting of the Mold cavity pressure occurs particularly in a closed loop in which pressure values for the mold cavity pressure are determined and compared with the delivery pressure, whereupon a control action is performed on an actuator to bring the current mold cavity pressure to an actual pressure.
  • the pressure in the mold cavity is determined again and, if necessary, again carried out a control intervention.
  • the differential pressure of mold cavity pressure and melt backpressure can be set to zero and a resid, respectively.
  • a negative residual may be specified to ensure that the mold cavity pressure is less than the delivery pressure.
  • All signals that is to say both measuring signals and actuating signals, are processed in a regulating or control device which is assigned to the die casting machine.
  • an open-loop control is contemplated in which the mold cavity pressure is not continuously determined, but only once or for a limited time and on the basis of the determined pressure adjustment via the actuator to change the mold cavity pressure he follows.
  • the control of the mold cavity pressure advantageously begins with the abutment of a mold half on the sealing cord on the opposite mold half. This can be determined either by increasing the mold cavity pressure or, in another embodiment, path-dependent by starting to adjust the mold cavity pressure after a defined travel distance traveled by the movable mold half.
  • the regulation of the mold cavity pressure is advantageously carried out, as shown above, via an adjustment of the feed or approach speed of the movable mold half. Additionally or alternatively, it is also possible, for example, to use a proportional valve as a pressure valve and to adjust the position of the valve body of the proportional valve for pressure regulation. Via the proportional valve, the mold cavity can be connected either to the atmosphere or to the evacuation device.
  • a vacuum die casting machine 1 which comprises two mold halves 2, 3, wherein the mold half 2 is stationary and the mold half 3 is movably held.
  • the mold half 3 is to be adjusted between the solid line retracted position 3 and the direction toward the stationary mold half 2 moved to the dashed line position 3 'shown.
  • the adjusting movement takes place with the aid of a hydraulic cylinder 4 formed as an actuator, which is supplied via a hydraulic valve 5 with hydraulic fluid, wherein the hydraulic valve 5 is set via control signals of a control or control device 6.
  • a casting or mold cavity 7 for receiving a molten metal is enclosed.
  • the mold cavity 7 is fluidly connected to a casting chamber 8, in which a casting piston 9 is adjustably mounted.
  • the casting chamber 8 is connected via a suction pipe 10 with a molten metal 11 in a holding furnace 12.
  • the intake pipe 10 so far immersed in the molten metal 11, that the mouth opening 13 by the amount h below the melt level or level 14 of the molten metal 11 is located.
  • the melt pressure which is required that gas is introduced into the molten metal 11 via the intake pipe 10, is calculated from the hydrostatic pressure and the ambient pressure acting on the melt level 14, whereby the hydrostatic pressure is multiplied by the height difference h between the melt level 14 and the mouth opening 13 calculated with the density of the molten metal.
  • the mold cavity 7 is associated with a three-way valve 15, which, as the enlarged view in Fig. 1 in a first position is connected to an evacuation device 16, which comprises a vacuum tank 17 and a vacuum pump 18. Furthermore, the three-way valve 15 is connected in a further position, which is designated by reference numeral 19, with the atmosphere. On the opposite side, the vacuum valve 15 is connected to the mold cavity 7. At the three-way valve 15, a pressure sensor 20 is further arranged, via which the mold cavity pressure p v can be measured.
  • the measured mold cavity pressure p v is supplied together with the melt pressure p i as an input signal to the control or control device 6, in which actuating signals for adjusting the hydraulic valve 5 and the hydraulic cylinder 4 are generated depending on the received signals to the feed rate of the movable mold half 3 influence.
  • the three-way valve 15 can be switched via control signals of the control or control device 6.
  • the movement of the casting piston 9 is adjusted via control signals of the regulating or control device 6.
  • the movable mold half 3 During the feed movement, the movable mold half 3 approaches the stationary mold half 2. On the front side of the movable mold half 3, a sealing gasket formed as a circumferential seal 21 is arranged, which projects beyond the end face of the movable mold half 3. As soon as the sealing cord 21 comes into contact with the opposite end face of the stationary mold half 2, an additional volume of air is enclosed in the mold cavity 7. The projection of the sealing cord 21 on the front side of the movable mold half 3 is marked with the dimension b, accordingly, the sealing cord 21 comes into contact with the end face of the stationary mold half 2, as soon as the distance between the mold halves falls below the dimension b.
  • Fig. 2 shows the three-way valve 15 during the delivery process of the movable mold half 3
  • Fig. 3 the three-way valve in a position connected to the evacuation device.
  • the three-way valve 15 comprises three individual valves 15a, 15b, 15c, of which the single valve 15a together with the single valve 15c, the connection between the mold cavity 7 and the atmosphere 19 and the single valve 15b in conjunction with the individual valve 15c, the flow connection between the mold cavity 7 and the Evacuation device 16 controls.
  • the individual valve 15 b is switched off, so that there is no flow connection between the mold cavity 7 and the evacuation device 16.
  • the individual valve 15a is connected in such a way that there is a flow connection between the atmosphere 19 and a region of the individual valve 15c facing away from the mold cavity 7.
  • the single valve 15c is in the closed position.
  • the individual valve 15 c Upon reaching the contact between the sealing cord 21 and the facing end face of the stationary mold half 2, the individual valve 15 c is opened, at the same time the individual valve 15 b is adjusted in the open position, so that the mold cavity 7 is connected to the evacuation device 16.
  • the pressure currently prevailing in the mold cavity 7 is measured via the pressure sensor 20.
  • a setting of the feed rate of the movable mold half 3 by adjusting signals of the control or control device 6. The adjustment takes place in such a way that the differential pressure Ap between the measured mold cavity pressure p v and the melt pressure p i , which is also measured, does not exceed a certain level.
  • the adjustment is made in particular in such a way that the mold cavity pressure p v is always smaller than the melt pressure p i , thereby ensuring that the trapped gas volume in the mold cavity 7 via the open connection via the casting chamber 8 and the intake manifold 10 can not get into the melt 11 in the holding furnace 12. In this way turbulence and gas inclusions in the melt 11 are avoided.
  • the evacuation of the gas volume takes place via the evacuation device 16.
  • the movable mold half 3 remains until the contact between the end faces of the two mold halves of the casting piston 9 in his in Fig. 1 shown, retracted position in which there is a continuous flow contact between the mold cavity 7 via the casting chamber 8 and the suction pipe 10 and the molten metal 11 in the holding furnace 12.
  • the above-described regulation or control takes place.
  • a vacuum can be generated via the connection of the mold cavity 7 with the evacuation device 16, which promotes melt 11 via the intake pipe 10 into the casting chamber 8. Subsequently, the melt is conveyed in the casting chamber 8 by a forward movement of the casting piston 9 in the mold cavity 7.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Claims (6)

  1. Procédé d'ajustage de la pression de la cavité de moule (pv) dans une cavité de moule (7) d'une machine à couler sous dépression (1), formée entre une moitié de moule stationnaire (2) et une moitié de moule mobile (3), la moitié de moule mobile (3), au début du processus de coulée, étant approchée de la moitié de moule stationnaire (2) à l'aide d'un dispositif de réglage et la pression de la cavité de moule (pv) étant alors détectée et étant ajustée à une valeur admissible en fonction de la pression différentielle (Δp) de la pression de la cavité de moule (pv) et d'une contre-pression de matière en fusion (pi) du métal en fusion (11), en régulant la pression de la cavité de moule (pv) par ajustement du dispositif de réglage de manière à empêcher une augmentation excessive de la contre-pression de matière en fusion (pi), la contre-pression de matière en fusion (pi) étant mesurée à partir de la pression hydrostatique entre l'embouchure d'un tuyau d'aspiration (10) qui plonge dans le métal en fusion (11) et le niveau (14) du métal en fusion (11) dans le four de maintien à température (12) et la pression appliquée au métal en fusion (11) s'y ajoutant.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    l'ajustement de la pression de la cavité de moule (pv) _s'effectue dans un circuit de réglage fermé.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    l'ajustement de la pression de la cavité de moule (pv) commence avec l'application d'une moitié de moule (2, 3) contre un joint d'étanchéité (21) qui est disposé au niveau de l'autre moitié de moule (2, 3).
  4. Procédé selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce que
    la vitesse de rapprochement de la moitié de moule mobile (3) est modifiée.
  5. Procédé selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce que
    la soupape de pression (15) disposée au niveau de la cavité de moule (7) est décalée dans la position d'ouverture pendant la régulation de la pression.
  6. Procédé selon l'une quelconque des revendications 1 à 5,
    caractérisé en ce que
    la soupape de pression (15) disposée au niveau de la cavité de moule (7) est connectée au dispositif d'évacuation (16) pendant la régulation de la pression.
EP11703128.6A 2011-01-28 2011-01-28 Procédé d´ajustage de la pression dans l´empreinte dans une machine à couler sous pression Active EP2536519B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2011/000376 WO2012100789A1 (fr) 2011-01-28 2011-01-28 Machine à coulée sous pression sous vide

Publications (2)

Publication Number Publication Date
EP2536519A1 EP2536519A1 (fr) 2012-12-26
EP2536519B1 true EP2536519B1 (fr) 2014-07-02

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Country Status (4)

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US (1) US9370822B2 (fr)
EP (1) EP2536519B1 (fr)
CN (1) CN103547394B (fr)
WO (1) WO2012100789A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012220513B4 (de) * 2012-11-12 2023-02-16 Bayerische Motoren Werke Aktiengesellschaft Verfahren und Vorrichtung zur Herstellung eines Druckgussteils
CN104668504B (zh) * 2013-11-30 2017-06-16 中国科学院金属研究所 非晶合金构件铸造成型设备和工艺
MX357777B (es) 2014-12-24 2018-07-19 Sintokogio Ltd Dispositivo de fundición y método de reemplazo de molde para dispositivo de fundición.
JP1540723S (fr) * 2015-02-25 2018-12-10
JP1540722S (fr) * 2015-02-25 2018-12-10
JP1540724S (fr) * 2015-02-25 2018-12-10
JP1540721S (fr) * 2015-02-25 2018-12-10
CN106312021B (zh) * 2015-06-17 2018-02-06 和昌精密股份有限公司 铸锻成型方法及其装置
CN107414050A (zh) * 2017-07-10 2017-12-01 许昌锦荣食品有限公司 一种块状非晶态合金高真空压铸成形设备
CN107282910A (zh) * 2017-08-02 2017-10-24 石狮市森科智能科技有限公司 一种真空压铸机
CN111451474B (zh) * 2020-04-24 2021-03-05 燕山大学 双工位真空压铸机

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DE3041340A1 (de) * 1980-11-03 1982-05-13 Maschinenfabrik Weingarten Ag, 7987 Weingarten Druckgiessverfahren zur herstellung von gasarmer, porenarmer und oxydarmer gussstuecke sowie druckgiessmaschine zur durchfuehrung des verfahrens
JPH02192868A (ja) * 1989-01-23 1990-07-30 Sintokogio Ltd 加圧鋳造装置
US5076344A (en) * 1989-03-07 1991-12-31 Aluminum Company Of America Die-casting process and equipment
DE19605727A1 (de) * 1996-02-16 1997-08-21 Mueller Weingarten Maschf Vakuum-Druckgießmaschine
JP3691783B2 (ja) * 2001-11-12 2005-09-07 東芝機械株式会社 ダイカストマシンの吸引給湯方法及び同方法を用いた吸引給湯装置
US6953079B2 (en) * 2002-11-06 2005-10-11 Toshiba Kikai Kabushiki Kaisha Die casting machine
JP3961929B2 (ja) * 2002-11-06 2007-08-22 東芝機械株式会社 ダイカストマシン
US7225854B2 (en) * 2004-03-30 2007-06-05 Mazda Motor Corporation Casting method and casting apparatus
JP4790358B2 (ja) * 2005-09-26 2011-10-12 東芝機械株式会社 型開閉装置及び型開閉方法
JP5339987B2 (ja) * 2009-03-27 2013-11-13 本田技研工業株式会社 鋳造機の制御装置

Also Published As

Publication number Publication date
EP2536519A1 (fr) 2012-12-26
CN103547394B (zh) 2015-11-25
US9370822B2 (en) 2016-06-21
CN103547394A (zh) 2014-01-29
US20140027081A1 (en) 2014-01-30
WO2012100789A1 (fr) 2012-08-02

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