EP1642660B1 - Dispositif et procédé pour la production des pièces moulées - Google Patents

Dispositif et procédé pour la production des pièces moulées Download PDF

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Publication number
EP1642660B1
EP1642660B1 EP04023277A EP04023277A EP1642660B1 EP 1642660 B1 EP1642660 B1 EP 1642660B1 EP 04023277 A EP04023277 A EP 04023277A EP 04023277 A EP04023277 A EP 04023277A EP 1642660 B1 EP1642660 B1 EP 1642660B1
Authority
EP
European Patent Office
Prior art keywords
drive unit
plunger rod
plunger
melt
injection plunger
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.)
Expired - Lifetime
Application number
EP04023277A
Other languages
German (de)
English (en)
Other versions
EP1642660A1 (fr
Inventor
Walter Wagner
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.)
Aluwag AG
Original Assignee
Aluwag AG
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 Aluwag AG filed Critical Aluwag AG
Priority to EP04023277A priority Critical patent/EP1642660B1/fr
Priority to DE502004006725T priority patent/DE502004006725D1/de
Priority to AT04023277T priority patent/ATE390973T1/de
Priority to US11/237,787 priority patent/US7290590B2/en
Publication of EP1642660A1 publication Critical patent/EP1642660A1/fr
Application granted granted Critical
Publication of EP1642660B1 publication Critical patent/EP1642660B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/203—Injection pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/08—Shaking, vibrating, or turning of moulds

Definitions

  • the invention relates to an apparatus and a method for producing molded parts with the features of the preamble of the independent claims.
  • the device or the method is suitable for die casting in a cold chamber process, in particular for aluminum die-casting.
  • Die casting is a widely used, rational manufacturing process for producing molded parts.
  • a melt is added from the material to be deformed in a casting chamber and moved by means of a casting piston in the casting chamber in the direction of a casting mold. First, the movement of the melt takes place relatively slowly in the casting chamber. At the end, the melt is pressed into the mold in a so-called shot with pressure.
  • a problem with such methods is that there are gases in the melt which, if possible, should be removed from the interior of the melt during the movement of the melt. Because the surface of the melt in the casting chamber is in contact with cold walls, there is formation of skin on the surface of the melt. Therefore, gases contained in the melt can hardly escape. This can lead to quality problems.
  • JP 60 250 866 it is known to provide a piston rod with a printhead with a resonator. With the resonator, a high-frequency vibration is generated, which is transmitted via the head to the melt. The purpose of this is to ensure that the melt also gets into thin gaps in the casting mold.
  • WO 2004/09273 a device for forming a crystallizable material in the liquid or pasty state is shown.
  • the material is excited to vibrate at least in some areas before and / or during forming and / or solidification.
  • the JP 07155925 shows a device for die casting. Between the piston rod and a drive piston rod, an elastic element is arranged. This can intercept the resulting pressure shock when filling the mold with melt.
  • WO96 / 38246 a die casting machine is shown, the casting piston is connected via a ball joint with the piston rod. As a result, the piston rod can be deflected out of the plane of the casting piston in order to compensate for any tracking inaccuracies.
  • the device according to the invention should be able to be manufactured and operated in a simple manner. In particular, the device should have high life and high reliability despite vibrating parts.
  • the apparatus for producing a molded part is constructed substantially in a conventional manner. It has a casting chamber, to which a melt can be supplied. A casting piston for moving the melt into a casting mold is slidably mounted in the casting chamber.
  • the device has a drive unit for actuating the casting piston. Typically, this is a hydraulic drive.
  • the device is provided with at least one vibration generator, with which the casting piston is longitudinally oscillatable.
  • longitudinal vibrations are understood to mean vibrations in the longitudinal direction of the casting piston, ie vibrations in its direction of movement.
  • the casting piston or a piston rod carrying the casting piston is movably connected to the drive unit.
  • the piston rod is movably connected in the longitudinal direction with the drive unit.
  • a resilient connection between the piston rod and the drive unit may be provided. Due to a longitudinally movable, resilient connection, the piston rod can be set in the longitudinal direction independent of the drive unit in vibration. When at Shot acceleration forces occur, these are not transferred directly from the piston rod to the drive unit, but collected by springs.
  • the piston rod is pivotally connected to the drive unit.
  • the vibration direction of the casting piston is not absolutely identical to the direction of movement of the drive unit, jamming of the piston rod relative to the drive unit can be prevented in this way. As a result, the wear can be reduced.
  • the piston rod is floating in the manner of a ball joint and connected by spring force to the drive unit. This allows an independent of the movement of the drive unit vibration of the casting piston, without causing the risk of jamming or transmission of pressure surges.
  • the piston rod preferably has a fastening head at its end facing away from the melt.
  • the mounting head is at least partially rounded and is resiliently mounted in a bearing cup of a connecting piece of the drive unit.
  • the mounting head can be held longitudinally by a spring assembly in the fitting. But it would also be possible in the longitudinal direction movable, resilient bearings. Thus, it is conceivable to provide other mechanically controlled or pneumatic or hydraulic devices.
  • the applied force should be dimensioned so that remain movable during the application of the melt with a force of the casting piston and the piston rod in the longitudinal direction, so that, for example, springs are not completely pushed. In the shooting phase there is higher pressure.
  • the fastening head the piston rod can readily abut against the inner surface of the bearing cup.
  • the mounting head is further provided with means for reducing the sliding friction between the mounting head and the inner surface of the bearing cup.
  • this may be a slip ring made of a high-slip material, such as typically Teflon®.
  • Teflon® a high-slip material
  • the surface of the bearing cup is also preferred to form the surface of the bearing cup of a material which has a greater hardness compared to the mounting head.
  • the surface of the bearing receiver may be hard chromed or ionitrided.
  • the mounting head of the piston rod is typically made of steel.
  • the vibrator is mounted directly on the piston rod itself.
  • vibrations can be transmitted directly to the melt.
  • the complex influence of the hydraulic system of the drive unit is therefore not necessary.
  • Such a direct arrangement of the vibration generator on the piston rod is of course particularly preferred in particular in connection with the above-described decoupled connection between casting piston or piston rod and drive unit.
  • the piston rod of the device according to the invention can in particular run approximately horizontally in the operating position.
  • the vibration generator or its housing is preferred in operating position vertically downwards directly attached to the piston rod.
  • the vibrator has a certain weight. By the vertically downwardly directed arrangement torques are avoided on the piston rod due to gravitational force on the vibrator.
  • the vibrator is designed to generate vibrations in the low-frequency range, typically between 5Hz and 100Hz, preferably between 30Hz and 50Hz.
  • the bearing cup in which the mounting head of the piston rod is mounted, provided with at least one vent opening.
  • the vent prevents the formation of air cushions between the surface of the mounting head and the inner surface of the bearing cup, which could hinder the free movement of the piston rod relative to the power unit.
  • the inventive method for producing a molded part consists essentially of the steps of introducing a melt into a casting chamber and pressing the melt into a casting mold.
  • a casting piston is used.
  • the melt is moved out of the casting chamber in the direction of the casting mold.
  • the firing phase the melt is forced under pressure into the casting mold.
  • the casting piston is subjected to vibrations in the longitudinal direction in the movement phase.
  • the casting piston is thereby set independently of the drive unit in vibration, so that no vibrations are transmitted to the drive unit.
  • the said method is performed with one of the devices described above.
  • FIG. 1 shows an inventive device 1 for producing a molded part with the features of the invention.
  • the device 1 has two mold parts 4a, 4b, which together define a cavity 26. Through a supply channel 27 molten metal can be pressed into the cavity 26. As a result, molded parts can be produced.
  • the mold parts 4a, 4b are movable in a known manner, so that the cavity 26 can be opened.
  • the mechanism for moving the moldings is in FIG. 1 Not shown.
  • a casting chamber 2 which is defined by a cylindrical tube 28 opens.
  • the tube 28 has an opening 29. Molten metal S can be inserted from a crucible 20 through the opening 29 in the casting chamber 2.
  • a displaceably mounted in the cylindrical tube 28 piston rod 3a can be moved in the direction L.
  • the piston rod 3a carries a casting piston 3b.
  • This drive unit is typically a hydraulic cylinder.
  • a vibration generator 6 is arranged on the piston rod 3a.
  • the vibrator oscillates in direction A at a frequency of typically 50Hz.
  • the casting 7 a, 4 b facing away from the end 7 of the piston rod 3 a is provided with a mounting head 8.
  • the mounting head 8 is fixed in the manner of a ball joint in a bearing cup 9 of a fitting 10.
  • the connector 10 is connected to the drive unit 5 or connectable. A more detailed description of the attachment can be found in FIG. 2 ,
  • the connector 10 is provided with an opening which forms a bearing cup 9 for receiving the mounting head 8 of the piston rod 3a.
  • the fastening head 8 of the piston rod 3 a has a rounded surface 14. Due to the rounded shape of the mounting head 8 this is pivotally mounted in the connector 10. In the area in which the rounded surface 14 contacts the inner surface 16 of the bearing cup 9, the mounting head 8 is also provided with a sliding ring 13 made of Teflon®. A closure piece 30 is provided with screws 17 (see FIG. 3 ) attached to the connector 10. In the longitudinal direction L of the mounting head 8 is held frictionally in the bearing cup 9 by a spring 11, 12 formed spring packet. In the longitudinal direction, the springs 12 are held by the closure piece 30 in the bearing cup 9. The mounting head 8 and the bearing cup 9 are dimensioned such that a narrow gap 18 between the inner surface 16 and the surface 14 is formed.
  • the gap width is chosen taking into account the force generated by the drive unit 5 and the spring force and the oscillation amplitude of the piston rod 3a so that the mounting head 8 does not hit the inner surface of the bearing cup 9.
  • the springs 11, 12 are dimensioned such that upon actuation of the connection piece 10 with the drive unit 5 in the longitudinal direction L, they displace the piston rod 3a and the casting piston 3b acting on the melt without any contact between the surface 14 of the fastening head 8 and the inner surface 16 of the connector 10 is formed.
  • the piston rod 3a and in particular the attachment head 8 is made of special steel.
  • the connection piece 10 is made of special steel.
  • the inner surface 16 is treated so that it has a greater hardness than the surface 14 of the mounting head 8. According to one embodiment, the surface is hard chromed. It could also be ionitriert. As springs, for example, linear springs will be used.
  • the connector 10 is provided with a screw thread 23. About the screw 23, the connector 10 can be easily with the in FIG. 1 connect drive unit 5 shown. In particular, it is also easy to use different piston rods 3a with corresponding connecting pieces, depending on the application.
  • the piston rod 3a is provided with a vibration generator 6.
  • a vibration generator 6 As the vibrator 6, a conventional vibrator is typically used. In a portion of the piston rod 3a, this is provided with a bead 24.
  • the bead 24 has a groove 25.
  • the vibration generator 6 is arranged in the longitudinal direction L in a form-fitting manner in the groove 25.
  • the piston rod 3 a can vibrate in the longitudinal direction L. Due to the floating bearing with the springs 11, 12, the vibration in the direction L can be done without the drive unit 5 is affected by the vibrations. In particular, due to the ball-joint-like mounting of the mounting head 8 in the connector 10 even with slight disparallelity between the vibration direction L of the piston rod 3a and the direction of movement of the drive unit 5 no jamming between the mounting head 8 and the fitting 10 arise. The risk of jamming is additionally reduced by the sliding ring 13. Due to the floating bearing and due to the non-positive connection by means of springs 11, 12 and the risk of pressure surges occurring during the shot of the piston rod 3a is reduced to the connector 10.
  • ventilation channels 15 are also provided, which open in the space between the inner surface 16 of the connecting piece 10 and the surface 14 of the mounting head 8 and in a receptacle for the spring 12. Thanks to the ventilation openings 15, the formation of air cushions can be prevented during movement of the fastening head 8 with respect to the bearing cup 9.
  • the piston rod 3a is also provided in a conventional manner with a cooling channel 22.
  • a coolant in the piston rod 3a circulate.
  • a coolant line 21 is provided for supplying the coolant.
  • the coolant line 21 extends in the installation position of the device 1 in the solder down.
  • the vibrator 6 also extends in the solder down. As a result, torques generated due to the gravitational force are prevented, which from the vibration generator. 6 and / or could act on the piston rod 3a from the coolant line 21.
  • FIG. 3 is a plan view of the arrangement FIG. 2 shown.
  • the support of the mounting head 8 in the bearing cup 9 is carried out by four rotationally symmetrical springs 11, which are arranged in spring receptacles of the connector 10 and by four rotationally symmetrically arranged springs 12, which are arranged in the closure piece 30.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Claims (11)

  1. Dispositif (1) pour la fabrication de pièces moulées, en particulier pour le moulage sous pression dans un procédé à chambre froide et en particulier de moulage d'aluminium sous pression, qui présente :
    - une chambre de moulage (2) dans laquelle on peut amener de la matière en fusion (S),
    - un piston de moulage (3b) qui repousse la matière en fusion (S) dans un moule de coulée (4a, 4b) et une tige de piston (3a) pour le piston de moulage (3b) et
    - une machine d'entraînement (5) qui actionne le piston de moulage (3b),
    le dispositif étant doté d'au moins un générateur d'oscillations (6) qui permet d'amener la tige de piston (3a) en oscillation longitudinale,
    caractérisé en ce que la tige de piston (3a) est reliée à déplacement dans le sens de sa longueur (L) à l'ensemble d'entraînement (5) et/ou la tige de piston (3a) est reliée de manière articulée à l'ensemble d'entraînement (5) de telle sorte que l'on obtienne un découplage entre le piston de moulage (3b) et l'ensemble d'entraînement (5), ce qui amène le piston de moulage (3b) à osciller sans que ces oscillations soient transmises à l'ensemble d'entraînement (5).
  2. Dispositif selon la revendication 1, caractérisé en ce que la tige de piston (3a) est reliée élastiquement à l'ensemble d'entraînement (5) sous une force élastique prédéterminée de manière à exercer une contre-poussée.
  3. Dispositif selon les revendications 1 et 2, caractérisé en ce que la tige de piston (3a) présente à une extrémité (7) une tête de fixation (8) au moins en partie arrondie et montée élastiquement dans une coupelle de montage (9) prévue sur une pièce de raccordement (10) de l'ensemble d'entraînement (5).
  4. Dispositif selon la revendication 3, caractérisé en ce que la tête de fixation (8) est maintenue dans le sens de sa longueur (L) dans la pièce de raccordement (10) par un paquet de ressorts (11, 12).
  5. Dispositif selon les revendications 3 ou 4, caractérisé en ce que la tête de fixation (8) est dotée de moyens (13) de réduction du frottement entre une surface (14) de la tête de fixation (8) et une surface intérieure (16) de la coupelle de montage (9), et en particulier d'une bague de coulissement.
  6. Dispositif selon l'une des revendications 3 à 5, caractérisé en ce que la surface (14) de la coupelle de montage (9) est constituée d'un matériau dont la dureté est plus élevée que celle de la tête de fixation (8) et en ce que la surface (14) de la coupelle de montage (9) est en particulier durcie par chromage ou par nitruration.
  7. Dispositif selon l'une des revendications 3 à 6, caractérisé en ce que la coupelle de montage (9) est dotée d'au moins une ouverture d'évent (15).
  8. Dispositif selon l'une des revendications 1 à 7, en particulier pour la moulage sous pression dans un procédé à chambre froide, et en particulier pour la moulage d'aluminium sous pression, qui présente :
    - une chambre de moulage (2) dans laquelle on peut amener de la matière en fusion (S),
    - un piston de moulage (3b) qui repousse la matière en fusion (S) dans un moule de coulée (4a, 4b) et une tige de piston (3a) et
    - un ensemble d'entraînement (5) qui actionne le piston de moulage (3a),
    le dispositif étant doté d'au moins un générateur d'oscillations (6) qui permet d'amener la tige de piston (3b) en oscillation longitudinale,
    caractérisé en ce que le générateur d'oscillations (6) est installé directement sur le piston de moulage (3b) ou sur la tige de piston (3a).
  9. Dispositif selon l'une des revendications 1 à 8, dans lequel en position de fonctionnement, la tige de piston (3a) s'étend essentiellement à l'horizontale, caractérisé en ce qu'en position de fonctionnement, le générateur d'oscillations (6) est installé sur la tige de piston (3a) en étant orienté vers le bas.
  10. Dispositif selon l'une des revendications 1 à 9, caractérisé en ce que le générateur d'oscillations (6) est conçu pour créer des oscillations dans la plage de 5 Hz à 100 Hz et en particulier de 30 Hz à 50 Hz.
  11. Procédé de fabrication d'une pièce moulée avec un dispositif selon l'une des revendications 1 à 10, lequel procédé est constitué des étapes qui consistent à :
    - introduire de la matière fondue (S) dans une chambre de moulage (2),
    - refouler la matière fondue (S) dans un moule de coulée (4a, 4b) au moyen d'un piston de moulage (3b),
    dans une phase de déplacement, la matière fondue (S) provenant de la chambre de moulage (2) est déplacée en direction du moule de coulée (4a, 4b) et
    dans une phase de tir, la matière fondue (S) est refoulée sous pression dans le moule de coulée (4a, 4b),
    le piston de moulage (3b) ou une tige de piston (3a) qui tient le piston de moulage (3b) étant amené à osciller dans le sens de la longueur (L) pendant la phase de déplacement,
    caractérisé en ce que pendant la phase de déplacement, la tige de piston (3a) est amenée de manière indépendante à osciller par un ensemble d'entraînement (5) qui déplace la tige de piston (3a),
    la tige de piston (3a) étant reliée à déplacement dans le sens de sa longueur (L) à l'ensemble d'entraînement (5) et/ou la tige de piston (3a) étant reliée de manière articulée à l'ensemble d'entraînement (5) de telle sorte que l'on obtienne un découplage entre le piston de moulage (3b) et l'ensemble d'entraînement (5), ce qui amène le piston de moulage (3b) à osciller sans que ces oscillations soient transmises à l'ensemble d'entraînement (5).
EP04023277A 2004-09-30 2004-09-30 Dispositif et procédé pour la production des pièces moulées Expired - Lifetime EP1642660B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP04023277A EP1642660B1 (fr) 2004-09-30 2004-09-30 Dispositif et procédé pour la production des pièces moulées
DE502004006725T DE502004006725D1 (de) 2004-09-30 2004-09-30 Vorrichtung und Verfahren zum Herstellen von Formteilen
AT04023277T ATE390973T1 (de) 2004-09-30 2004-09-30 Vorrichtung und verfahren zum herstellen von formteilen
US11/237,787 US7290590B2 (en) 2004-09-30 2005-09-29 Apparatus and process for producing shaped parts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04023277A EP1642660B1 (fr) 2004-09-30 2004-09-30 Dispositif et procédé pour la production des pièces moulées

Publications (2)

Publication Number Publication Date
EP1642660A1 EP1642660A1 (fr) 2006-04-05
EP1642660B1 true EP1642660B1 (fr) 2008-04-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP04023277A Expired - Lifetime EP1642660B1 (fr) 2004-09-30 2004-09-30 Dispositif et procédé pour la production des pièces moulées

Country Status (4)

Country Link
US (1) US7290590B2 (fr)
EP (1) EP1642660B1 (fr)
AT (1) ATE390973T1 (fr)
DE (1) DE502004006725D1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106984793A (zh) * 2017-06-08 2017-07-28 江苏华晟电气科技有限公司 一种震动消泡压铸机注料器
CN112893800A (zh) * 2021-01-20 2021-06-04 辽宁凯文众鑫装备制造有限公司 倾斜式压室

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5210712B2 (fr) * 1974-05-01 1977-03-25
JPS60250866A (ja) * 1984-05-25 1985-12-11 Toshiba Mach Co Ltd ダイカスト機
JPH07164128A (ja) * 1993-12-10 1995-06-27 Ube Ind Ltd 加圧鋳造方法および装置
JPH07155925A (ja) * 1993-12-10 1995-06-20 Hitachi Ltd ダイカストマシンの射出圧力制御方法
DE4441735C2 (de) * 1994-11-23 2003-08-21 Hugo Kunz Druckgießkolben, insbesondere für Kaltkammer-Druckgießmaschinen
BR9502167A (pt) * 1995-06-01 1997-08-26 Wilmar Ficher Representacoes L Pistão alternativo para máquina injetora de metal líquido
US5755848A (en) * 1995-10-30 1998-05-26 Asahi Glass Company Ltd. Plunger supporting mechanism
JP4530554B2 (ja) * 2001-02-16 2010-08-25 Ｔｈｋ株式会社 滑り軸受の製造方法
DE10233067A1 (de) * 2002-07-19 2004-02-05 Bühler AG Umformung eines kristallisierbaren Materials im flüssigen oder pastösen Zustand

Also Published As

Publication number Publication date
DE502004006725D1 (de) 2008-05-15
EP1642660A1 (fr) 2006-04-05
ATE390973T1 (de) 2008-04-15
US20060065384A1 (en) 2006-03-30
US7290590B2 (en) 2007-11-06

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