EP1642660A1 - Apparatus and process for the production of compacts - Google Patents

Apparatus and process for the production of compacts Download PDF

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Publication number
EP1642660A1
EP1642660A1 EP04023277A EP04023277A EP1642660A1 EP 1642660 A1 EP1642660 A1 EP 1642660A1 EP 04023277 A EP04023277 A EP 04023277A EP 04023277 A EP04023277 A EP 04023277A EP 1642660 A1 EP1642660 A1 EP 1642660A1
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EP
European Patent Office
Prior art keywords
casting
piston rod
piston
melt
drive unit
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
EP04023277A
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German (de)
French (fr)
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EP1642660B1 (en
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
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Aluwag Gebr Wagner 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.)
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Publication date
Application filed by Aluwag Gebr Wagner AG filed Critical Aluwag Gebr Wagner AG
Priority to EP04023277A priority Critical patent/EP1642660B1/en
Priority to DE502004006725T priority patent/DE502004006725D1/en
Priority to AT04023277T priority patent/ATE390973T1/en
Priority to US11/237,787 priority patent/US7290590B2/en
Publication of EP1642660A1 publication Critical patent/EP1642660A1/en
Application granted granted Critical
Publication of EP1642660B1 publication Critical patent/EP1642660B1/en
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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
    • 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 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.
  • WO 2004/00273 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 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 TeflonĀ®.
  • TeflonĀ® 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.
  • that can be said method preferably carried out with one of the devices described above.
  • FIG. 1 shows an apparatus 1 according to the invention 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 not shown in FIG.
  • 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 illustration 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 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 TeflonĀ®. A closure piece 30 is fastened to the connection piece 10 with screws 17 (see FIG. 3). 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 a 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 selected taking into account the force generated by the drive unit 5 and the spring force and the oscillation amplitude of the piston rod 30 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 connector 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. Via the screw thread 23, the connection piece 10 can be easily connected to the drive unit 5 shown in FIG. 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.
  • Oscillator 6 typically uses a conventional vibrator. 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 liquid 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 frictional connection by means of springs 11, 12 and the risk of pressure surges occurring at the end of the piston rod 3a is reduced to the fitting 10.
  • ventilation channels 15 are provided, which open in the space between the inner surface 16 of the fitting 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 cushion or can be prevented during movement of the mounting 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 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 shows a top view of the arrangement from FIG.
  • 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)

Abstract

Shaped parts production apparatus comprises a shot sleeve (2) into which a melt can be fed, an injection plunger for forcing the melt into a die (4a, 4b), a plunger rod for the injection plunger, a drive unit for actuating the injection plunger, and at least one oscillation generator by which the plunger rod can be reciprocated along its longitudinal axis. The plunger rod is moveably connected or connectable to the drive unit.

Description

Die Erfindung betrifft eine Vorrichtung und ein Verfahren zum Herstellen von Formteilen mit den Merkmalen des Oberbegriffs der unabhƤngigen PatentansprĆ¼che. Insbesondere eignet sich die Vorrichtung bzw. das Verfahren zum Druckgiessen in einem Kaltkammerverfahren, insbesondere zum Aluminiumdruckguss. Druckguss ist ein weit verbreitetes, rationelles Herstellverfahren zum Erzeugen von Formteilen. Dabei wird eine Schmelze aus dem zu verformenden Material in eine Giesskammer gegeben und mittels eines Giesskolbens in der Giesskammer in Richtung einer Giessform bewegt. Zuerst erfolgt die Bewegung der Schmelze in der Giesskammer verhƤltnismƤssig langsam. Am Schluss wird die Schmelze in einem sogenannten Schuss mit Druck in die Gussform gedrĆ¼ckt.The invention relates to an apparatus and a method for producing molded parts with the features of the preamble of the independent claims. In particular, 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. In this case, 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 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.

Ein Problem bei solchen Verfahren besteht darin, dass in der Schmelze Gase enthalten sind, welche wenn mƶglich wƤhrend der Bewegung der Schmelze aus dem Innern der Schmelze entfernt werden sollten. Weil die OberflƤche der Schmelze in der Giesskammer mit kalten WƤnden in Kontakt steht, ergibt sich eine Bildung von Haut auf der OberflƤche der Schmelze. In der Schmelze enthaltene Gase kƶnnen daher nur schlecht austreten. Daraus kƶnnen sich QualitƤtsprobleme ergeben.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.

Im Zusammenhang mit Giessverfahren ist es seit langem bekannt, Vibrationen zur Verbesserung der WerkstĆ¼ckqualitƤt einzusetzen. Aus JP 60 250 688 ist es beispielsweise bekannt, eine Kolbenstange mit einem Druckkopf mit einem Resonator zu versehen. Mit dem Resonator wird eine hoch frequente Schwingung erzeugt, die Ć¼ber den Kopf auf die Schmelze Ć¼bertragen wird. Damit soll bezweckt werden, dass die Schmelze auch in dĆ¼nne Spalten der Gussform gelangt.In connection with casting processes, it has long been known to use vibrations to improve the quality of workpieces. From JP 60 250 688 it is known, for example, 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.

In WO 2004/00273 ist eine Vorrichtung zur Umformung eines kristallisierbaren Materials im flĆ¼ssigen oder pastƶsen Zustand gezeigt. GemƤss dieser Offenbarung wird das Material vor und/oder wƤhrend des Umformens und/oder des Erstarrens zumindest in Teilbereichen zu Schwingungen angeregt. Unter anderem wird darin vorgeschlagen, eine Schwingungserzeugungseinheit mit der hydraulischen Druckleitung zu verbinden, welche zur Bewegung des Giesskolbens dient.In WO 2004/00273 a device for forming a crystallizable material in the liquid or pasty state is shown. According to this disclosure, the material is excited to vibrate at least in some areas before and / or during forming and / or solidification. Among other things, it is proposed to connect a vibration generating unit with the hydraulic pressure line, which serves to move the casting piston.

Diese bekannten Vorrichtungen weisen aber alle bestimmte Nachteile auf. Insbesondere ist es schwierig, Ć¼ber die hydraulische Druckleitung ausreichend rasch und kontrolliert Schwingungen auf den Giesskolben zu Ć¼bertragen. Die Anpassung des hydraulischen Systems ist ausserdem aufwendig und teuer.However, these known devices all have certain disadvantages. In particular, it is difficult to transmit vibrations to the casting piston sufficiently quickly and in a controlled manner via the hydraulic pressure line. The adaptation of the hydraulic system is also expensive and expensive.

Beim Schuss der Schmelze in die Gussform treten auf den Giesskolben erhebliche BeschleunigungskrƤfte auf. Es besteht daher die Gefahr der Zerstƶrung von Schwingaggregaten, welche wie in JP 60 250 866 A gezeigt am Giesskolben angreifen.When the melt is shot into the casting mold, considerable acceleration forces occur on the casting piston. There is therefore a risk of destruction of vibrating units, which as shown in JP 60 250 866 A attack on the casting piston.

Es ist daher eine Aufgabe der vorliegenden Erfindung, die Nachteile des Standes der Technik zu vermeiden, insbesondere also eine Vorrichtung und ein Verfahren zum Herstellen eines Formteils zu schaffen, welches auf einfache Weise eine Verbesserung der QualitƤt der Formteile erlaubt, insbesondere die Bildung von Haut auf der OberflƤche der Schmelze verhindert oder reduziert. Die erfindungsgemƤsse Vorrichtung soll auf einfache Weise hergestellt und betrieben werden kƶnnen. Insbesondere soll die Vorrichtung trotz vibrierenden Teilen hohe Standzeiten und hohe ZuverlƤssigkeit aufweisen.It is therefore an object of the present invention to avoid the disadvantages of the prior art, in particular to provide an apparatus and a method for producing a molded part, which allows a simple improvement of the quality of the molded parts, in particular the formation of skin prevents or reduces the surface of the melt. 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.

ErfindungsgemƤss werden diese Aufgaben mit einer Vorrichtung und einem Verfahren mit den Merkmalen des kennzeichnenden Teils der unabhƤngigen PatentansprĆ¼che gelƶst.According to the invention, these objects are achieved by a device and a method having the features of the characterizing part of the independent patent claims.

Die Vorrichtung zum Herstellen eines Formteils ist im Wesentlichen in herkƶmmlicher Weise aufgebaut. Sie weist eine Giesskammer auf, welcher eine Schmelze zufĆ¼hrbar ist. Ein Giesskolben zum Bewegen der Schmelze in eine Gussform ist verschiebbar in der Giesskammer gelagert. Die Vorrichtung weist ein Antriebsaggregat zum BetƤtigen des Giesskolbens auf. Typischerweise handelt es sich hier um einen hydraulischen Antrieb. Die Vorrichtung ist mit wenigstens einem Schwingungserzeuger versehen, mit dem der Giesskolben in LƤngsschwingungen versetzbar ist. Unter LƤngsschwingungen werden in diesem Zusammenhang Schwingungen in LƤngsrichtung des Giesskolbens, das heisst Schwingungen in dessen Bewegungsrichtung verstanden. ErfindungsgemƤss ist der Giesskolben bzw. eine den Giesskolben tragende Kolbenstange beweglich mit dem Antriebsaggregat verbunden. Durch eine bewegliche Verbindung zwischen Giesskolben bzw. Kolbenstange und Antriebsaggregat ergibt sich eine Entkopplung zwischen Giesskolben und Antriebsaggregat. Der Giesskolben und die Kolbenstange kƶnnen sich daher in gewissen Grenzen bezogen auf das Antriebsaggregat bewegen. Durch diese Entkopplung lƤsst sich der Giesskolben in Schwingungen versetzen, ohne dass diese auf das Antriebsaggregat Ć¼bertragen werden.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. In this context, longitudinal vibrations are understood to mean vibrations in the longitudinal direction of the casting piston, ie vibrations in its direction of movement. According to the invention, the casting piston or a piston rod carrying the casting piston is movably connected to the drive unit. By a movable connection between the casting piston or piston rod and drive unit results in a decoupling between the casting piston and drive unit. The casting piston and the piston rod can therefore move within certain limits relative to the drive unit. This decoupling allows the casting piston to oscillate without being transmitted to the drive unit.

GemƤss einem bevorzugten AusfĆ¼hrungsbeispiel der Erfindung ist die Kolbenstange in LƤngsrichtung beweglich mit dem Antriebsaggregat verbunden. Insbesondere kann eine federnde Verbindung zwischen der Kolbenstange und dem Antriebsaggregat vorgesehen sein. Auf Grund einer in LƤngsrichtung beweglichen, federnden Verbindung lƤsst sich die Kolbenstange in LƤngsrichtung unabhƤngig vom Antriebsaggregat in Schwingungen versetzen. Wenn beim Schuss BeschleunigungskrƤfte auftreten, werden diese nicht direkt von der Kolbenstange auf das Antriebsaggregat Ć¼bergeben, sondern durch Federn aufgefangen.According to a preferred embodiment of the invention, the piston rod is movably connected in the longitudinal direction with the drive unit. In particular, 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.

Besonders bevorzugt ist die Kolbenstange gelenkig mit dem Antriebsaggregat verbunden. Insbesondere wenn die Schwingungsrichtung des Giesskolbens nicht absolut identisch mit der Bewegungsrichtung des Antriebsaggregates ist, kann auf diese Weise ein Verklemmen der Kolbenstange gegenĆ¼ber dem Antriebsaggregat verhindert werden. Dadurch kann die AbnĆ¼tzung verringert werden.Particularly preferably, the piston rod is pivotally connected to the drive unit. In particular, when 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.

Bevorzugt ist also die Kolbenstange in der Art eines Kugelgelenks schwimmend und unter Federkraft mit dem Antriebsaggregat verbunden. Dies ermƶglicht eine von der Bewegung des Antriebsaggregats unabhƤngige Schwingung des Giesskolbens, ohne dass dabei das Risiko von Verklemmungen oder von Ɯbertragung von Druckstƶssen besteht.Preferably, therefore, 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.

Bevorzugt weist die Kolbenstange an seinem der Schmelze abgewandten Ende einen Befestigungskopf auf. Der Befestigungskopf ist wenigstens teilweise abgerundet und ist federnd in einer Lagerpfanne eines AnschlussstĆ¼cks des Antriebsaggregates gelagert. Typischerweise kann der Befestigungskopf in LƤngsrichtung durch ein Federpaket im AnschlussstĆ¼ck gehalten werden. Es wƤren aber auch andere in LƤngsrichtung bewegliche, federnde Lagerungen mƶglich. So ist es denkbar, andere mechanisch gesteuerte oder auch pneumatische oder hydraulische Vorrichtungen vorzusehen. Die aufgebrachte Kraft soll so dimensioniert werden, dass wƤhrend der Beaufschlagung der Schmelze mit einer Kraft der Giesskolben und die Kolbenstange in der LƤngsrichtung beweglich bleiben, dass also z.B. Federn nicht vollstƤndig durchgedrĆ¼ckt werden. In der Schussphase herrscht hƶherer Druck. Der Befestigungskopf der Kolbenstange kann ohne weiteres an der InnenflƤche der Lagerpfanne anliegen.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. Typically, 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.

Bevorzugt ist der Befestigungskopf ausserdem mit Mitteln zum Reduzieren der Gleitreibung zwischen dem Befestigungskopf und der InnenflƤche der Lagerpfanne versehen. Typischerweise kann dies ein Gleitring aus einem Material mit hohen Gleiteigenschaften, wie typischerweise TeflonĀ® sein. Es ist aber auch denkbar, den Befestigungskopf mit einer Beschichtung, beispielsweise einer Teflonbeschichtung zu versehen. Das Risiko des Verklemmens zwischen Antriebsaggregat und Giesskolben bei DisparallelitƤt ihrer Bewegungen wird daher weiter verringert.Preferably, 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. Typically, this may be a slip ring made of a high-slip material, such as typically TeflonĀ®. However, it is also conceivable to provide the fastening head with a coating, for example a Teflon coating. The risk of jamming between the drive unit and the casting piston with disparallelity of their movements is therefore further reduced.

Es ist ausserdem bevorzugt, die OberflƤche der Lagerpfanne aus einem Material auszubilden, das im Vergleich zum Befestigungskopf eine grƶssere HƤrte aufweist. Typischerweise kann die OberflƤche der Lageraufnahme hart verchromt oder ionitriert sein. Der Befestigungskopf der Kolbenstange besteht typischerweise aus Stahl.It is also preferred to form the surface of the bearing cup of a material which has a greater hardness compared to the mounting head. Typically, the surface of the bearing receiver may be hard chromed or ionitrided. The mounting head of the piston rod is typically made of steel.

GemƤss einem weiteren Aspekt der Erfindung ist der Schwingungserzeuger direkt an der Kolbenstange selbst angebracht. Dadurch lassen sich Schwingungen direkt auf die Schmelze Ć¼bertragen. Die komplexe Beeinflussung der Hydraulik des Antriebsaggregats ist daher nicht nƶtig. Besonders bevorzugt ist eine solche direkte Anordnung des Schwingungserzeugers an der Kolbenstange selbstverstƤndlich insbesondere im Zusammenhang mit der vorstehend beschriebenen entkoppelten Verbindung zwischen Giesskolben bzw. Kolbenstange und Antriebsaggregat.According to another aspect of the invention, the vibrator is mounted directly on the piston rod itself. As a result, 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.

Die Kolbenstange der erfindungsgemƤssen Vorrichtung kann in Betriebslage insbesondere etwa horizontal verlaufen. In diesem Fall ist der Schwingungserzeuger bzw. dessen GehƤuse bevorzugt in Betriebslage lotrecht nach unten gerichtet direkt an der Kolbenstange angebracht. Der Schwingungserzeuger weist ein gewisses Gewicht auf. Durch die lotrecht nach unten gerichtete Anordnung werden Drehmomente auf die Kolbenstange auf Grund von Gravitationskraft auf den Schwingungserzeuger vermieden.The piston rod of the device according to the invention can in particular run approximately horizontally in the operating position. In this case, 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.

Typischerweise ist der Schwingungserzeuger zur Erzeugung von Schwingungen im niedrig frequenten Bereich, typischerweise zwischen 5Hz und 100Hz, vorzugsweise zwischen 30Hz und 50Hz ausgebildet.Typically, the vibrator is designed to generate vibrations in the low-frequency range, typically between 5Hz and 100Hz, preferably between 30Hz and 50Hz.

GemƤss einer weiteren bevorzugten AusfĆ¼hrungsform der Erfindung ist die Lagerpfanne, in der der Befestigungskopf der Kolbenstange gelagert ist, mit wenigstens einer EntlĆ¼ftungsƶffnung versehen. Die EntlĆ¼ftungsƶffnung verhindert, dass sich zwischen der OberflƤche des Befestigungskopfs und der InnenflƤche der Lagerpfanne Luftkissen bilden, welche die freie Bewegung der Kolbenstange bezĆ¼glich dem Antriebsaggregat behindern kƶnnten.According to a further preferred embodiment of the invention, 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.

Das erfindungsgemƤsse Verfahren zum Herstellen eines Formteils besteht im Wesentlichen aus den Schritten des EinfĆ¼hrens einer Schmelze in eine Giesskammer und des DrĆ¼ckens der Schmelze in eine Gussform. Dazu wird ein Giesskolben verwendet. In einer ersten Bewegungsphase wird die Schmelze aus der Giesskammer in Richtung des Gussform bewegt. In einer zweiten Phase, der Schussphase, wird die Schmelze unter Druck in die Giessform gedrĆ¼ckt. ErfindungsgemƤss wird der Giesskolben in der Bewegungsphase in LƤngsrichtung mit Schwingungen beaufschlagt.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. For this purpose, a casting piston is used. In a first movement phase, the melt is moved out of the casting chamber in the direction of the casting mold. In a second phase, the firing phase, the melt is forced under pressure into the casting mold. According to the invention, the casting piston is subjected to vibrations in the longitudinal direction in the movement phase.

Der Giesskolben wird dabei unabhƤngig vom Antriebsaggregat in Schwingungen versetzt, sodass keine Schwingungen auf das Antriebsaggregat Ć¼bertragen werden. Insbesondere lƤsst sich das genannte Verfahren bevorzugt mit einer der vorstehend beschriebenen Vorrichtungen durchfĆ¼hren.The casting piston is thereby set independently of the drive unit in vibration, so that no vibrations are transmitted to the drive unit. In particular, that can be said method preferably carried out with one of the devices described above.

Die Erfindung wird im Folgenden in AusfĆ¼hrungsbeispielen und an Hand der Zeichnungen nƤher erlƤutert. Es zeigen:

Figur 1:
Eine schematische Darstellung einer erfindungsgemƤssen Vorrichtung,
Figur 2:
einen Querschnitt durch den Befestigungskopf einer Kolbenstange gemƤss der Erfindung entlang der Ebene A-A an Figur 3 und
Figur 3:
eine Draufsicht auf den Giesskolben gemƤss Figur 2.
The invention will be explained in more detail below in embodiments and with reference to the drawings. Show it:
FIG. 1:
A schematic representation of a device according to the invention,
FIG. 2:
a cross section through the mounting head of a piston rod according to the invention along the plane AA of Figure 3 and
FIG. 3:
a plan view of the casting piston according to Figure 2.

Figur 1 zeigt eine erfindungsgemƤsse Vorrichtung 1 zum Herstellen eines Formteils mit den Merkmalen der Erfindung. Die Vorrichtung 1 weist zwei Formteile 4a, 4b auf, welche zusammen einen Hohlraum 26 begrenzen. Durch einen Zufuhrkanal 27 kann Metallschmelze in den Hohlraum 26 eingepresst werden. Dadurch kƶnnen Formteile hergestellt werden. Die Gussformteile 4a, 4b sind auf bekannte Art und Weise bewegbar, so dass der Hohlraum 26 geƶffnet werden kann. Der Mechanismus zum Bewegen der Formteile ist in Figur 1 nicht gezeigt. In den Zufuhrkanal 27 mĆ¼ndet eine Giesskammer 2, welche durch ein zylindrisches Rohr 28 definiert wird. Das Rohr 28 weist eine Ɩffnung 29 auf. Metallschmelze S kann aus einem Tiegel 20 durch die Ɩffnung 29 in die Giesskammer 2 eingefĆ¼gt werden. Eine im zylindrischen Rohr 28 verschiebbar gelagerte Kolbenstange 3a lƤsst sich in Richtung L verschieben. Die Kolbenstange 3a trƤgt einen Giesskolben 3b. Durch Bewegung der Kolbenstange 3a lƤsst sich in der Giesskammer 2 enthaltene Schmelze S in Richtung Zufuhrkanal 27 und durch diesen in den Hohlraum 26 bewegen. Zum bewegen des Kolbenstange 3a ist diese mit einem schematisch dargestellten Anschluss 5 eines Antriebsaggregats verbunden. Dieses Antriebsaggregat ist typischerweise ein Hydraulikzylinder.FIG. 1 shows an apparatus 1 according to the invention 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 not shown in FIG. In the supply channel 27, 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. By movement of the piston rod 3 a can be contained in the casting chamber 2 Melt S in the direction of supply channel 27 and through this move into the cavity 26. To move the piston rod 3a, this is connected to a connection 5 of a drive unit shown schematically. This drive unit is typically a hydraulic cylinder.

GemƤss der Erfindung ist ein Schwingungserzeuger 6 an der Kolbenstange 3a angeordnet. Der Schwingungserzeuger schwingt in Richtung A mit einer Frequenz von typischerweise 50Hz. Das den Gussformen 4a, 4b abgewandte Ende 7 der Kolbenstange 3a ist mit einem Befestigungskopf 8 versehen. Der Befestigungskopf 8 ist in der Art eines Kugelgelenks in einer Lagerpfanne 9 eines AnschlussstĆ¼cks 10 befestigt. Das AnschlussstĆ¼ck 10 ist mit dem Antriebsaggregat 5 verbunden oder verbindbar. Eine detailliertere Darstellung der Befestigung findet sich in Figur 2.According to the invention, 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 illustration of the attachment can be found in FIG. 2.

Das AnschlussstĆ¼ck 10 ist mit einer Ɩffnung versehen, welche eine Lagerpfanne 9 zur Aufnahme des Befestigungskopfs 8 der Kolbenstange 3a bildet.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.

Der Befestigungskopf 8 der Kolbenstange 3 weist eine abgerundete OberflƤche 14 auf. Auf Grund der abgerundeten Form des Befestigungskopfs 8 ist dieser schwenkbar im AnschlussstĆ¼ck 10 gelagert. Im Bereich, in dem die abgerundete OberflƤche 14 die InnenflƤche 16 der Lagerpfanne 9 berĆ¼hrt, ist der Befestigungskopf 8 ausserdem mit einem Gleitring 13 aus TeflonĀ® versehen. Ein VerschlussstĆ¼ck 30 ist mit Schrauben 17 (siehe Figur 3) am AnschlussstĆ¼ck 10 befestigt. In LƤngsrichtung L ist der Befestigungskopf 8 in der Lagerpfanne 9 durch ein aus Federn 11, 12 gebildetes Federpaket kraftschlĆ¼ssig gehalten. In LƤngsrichtung werden die Federn 12 durch ein VerschlussstĆ¼ck 30 in der Lagerpfanne 9 gehalten. Der Befestigungskopf 8 und die Lagerpfanne 9 sind derart dimensioniert, dass ein schmaler Spalt 18 zwischen der InnenflƤche 16 und der OberflƤche 14 gebildet wird. Die Spaltbreite ist unter der BerĆ¼cksichtigung der vom Antriebsaggregat 5 erzeugten Kraft und der Federkraft sowie der Schwingungs-Amplitude der Kolbenstange 30 so gewƤhlt, dass der Befestigungskopf 8 nicht an die InnenflƤche der Lagerpfanne 9 schlƤgt. Die Federn 11, 12 sind derart dimensioniert, dass sie bei BetƤtigung des AnschlussstĆ¼cks 10 mit dem Antriebsaggregat 5 in LƤngsrichtung L die Kolbenstange 3a und den die Schmelze beaufschlagenden Giesskolben 3b verschieben, ohne dass ein Kontakt zwischen der OberflƤche 14 des Befestigungskopfs 8 und der InnenflƤche 16 des AnschlussstĆ¼cks 10 entsteht.The fastening head 8 of the piston rod 3 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 TeflonĀ®. A closure piece 30 is fastened to the connection piece 10 with screws 17 (see FIG. 3). 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 a 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 selected taking into account the force generated by the drive unit 5 and the spring force and the oscillation amplitude of the piston rod 30 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.

Die Kolbenstange 3a und insbesondere der Befestigungskopf 8 ist aus Spezial-Stahl gefertigt. Das AnschlussstĆ¼ck 10 ist aus Spezial-Stahl gefertigt. Die InnenflƤche 16 ist derart behandelt, dass sie eine grƶssere HƤrte aufweist als die OberflƤche 14 des Befestigungskopfs 8. GemƤss einem AusfĆ¼hrungsbeispiel ist die OberflƤche hart verchromt. Sie kƶnnte auch ionitriert sein. Als Federn werden beispielsweise Linear-Federn verwendet werden.The piston rod 3a and in particular the attachment head 8 is made of special steel. The connector 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.

Das AnschlussstĆ¼ck 10 ist mit einem Schraubgewinde 23 versehen. Ɯber das Schraubgewinde 23 lƤsst sich das AnschlussstĆ¼ck 10 einfach mit dem in Figur 1 gezeigten Antriebsaggregat 5 verbinden. Es ist insbesondere auch einfach, je nach Anwendungsfall unterschiedliche Kolbenstange 3a mit entsprechenden AnschlussstĆ¼cken einzusetzen.The connector 10 is provided with a screw thread 23. Via the screw thread 23, the connection piece 10 can be easily connected to the drive unit 5 shown in FIG. In particular, it is also easy to use different piston rods 3a with corresponding connecting pieces, depending on the application.

GemƤss der Erfindung ist die Kolbenstange 3a mit einem Schwingungserzeuger 6 versehen. Aus Schwingungserzeuger 6 wird typischerweise ein herkƶmmlicher Vibrator verwendet. In einem Abschnitt der Kolbenstange 3a ist diese mit einem Wulst 24 versehen. Der Wulst 24 weist eine Nut 25 auf. Der Schwingungserzeuger 6 ist in LƤngsrichtung L formflĆ¼ssig in der Nut 25 angeordnet.According to the invention, the piston rod 3a is provided with a vibration generator 6. Oscillator 6 typically uses a conventional vibrator. 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 liquid in the groove 25.

Mit dem Schwingungserzeuger 6 lƤsst sich die Kolbenstange 3a in LƤngsrichtung L vibrieren. Auf Grund der schwimmenden Lagerung mit den Federn 11, 12 kann die Vibration in Richtung L erfolgen, ohne dass das Antriebsaggregat 5 durch die Schwingungen beeintrƤchtigt wird. Insbesondere kann auf Grund der kugelgelenkartigen Lagerung des Befestigungskopfes 8 im AnschlussstĆ¼ck 10 auch bei leichter DisparallelitƤt zwischen der Schwingungsrichtung L der Kolbenstange 3a und der Bewegungsrichtung des Antriebsaggregats 5 keine Verklemmung zwischen dem Befestigungskopf 8 und dem AnschlussstĆ¼ck 10 entstehen. Das Risiko von Verklemmungen wird zusƤtzlich durch den Gleitring 13 reduziert. Auf Grund der schwimmenden Lagerung und auf Grund der kraftschlĆ¼ssigen Verbindung mittels Federn 11, 12 ist auch die Gefahr von beim Schluss auftretenden Druckstƶssen von der Kolbenstange 3a auf das AnschlussstĆ¼ck 10 reduziert. Im AnschlussstĆ¼ck 10 bzw. im VerschlussstĆ¼ck 30 sind ausserdem EntlĆ¼ftungskanƤle 15 vorgesehen, die im Zwischenraum zwischen der InnenflƤche 16 des AnschlussstĆ¼cks 10 und der OberflƤche 14 des Befestigungskopfs 8 bzw. in einer Aufnahme fĆ¼r die Feder 12 mĆ¼nden. Dank der EntlĆ¼ftungsƶffnungen 15 kann bei Bewegung des Befestigungskopfs 8 bezĆ¼glich der Lagerpfanne 9 die Bildung von Luftkissen oder verhindert werden.With the vibration generator 6, 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 frictional connection by means of springs 11, 12 and the risk of pressure surges occurring at the end of the piston rod 3a is reduced to the fitting 10. In the connecting piece 10 and in the closure piece 30 are also ventilation channels 15 are provided, which open in the space between the inner surface 16 of the fitting 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 cushion or can be prevented during movement of the mounting head 8 with respect to the bearing cup 9.

Die Kolbenstange 3a ist ausserdem in an sich bekannter Weise mit einem KĆ¼hlkanal 22 versehen. Durch den doppelwandig (nicht dargestellt) ausgebildeten KĆ¼hlkanal 22 kann ein KĆ¼hlmittel in der Kolbenstange 3a zirkulieren. Zur Zufuhr des KĆ¼hlmittels ist eine KĆ¼hlmittelleitung 21 vorgesehen. Das KĆ¼hlmittel 21 erstreckt sich in Einbaulage der Vorrichtung 1 im Lot nach unten. Der Schwingungserzeuger 6 erstreckt sich ebenfalls im Lot nach unten. Dadurch werden auf Grund der Gravitationskraft erzeugte Drehmomente verhindert, welche vom Schwingungserzeuger 6 und/oder von der KĆ¼hlmittelleitung 21 auf die Kolbenstange 3a wirken kƶnnten.The piston rod 3a is also provided in a conventional manner with a cooling channel 22. By the double-walled (not shown) formed cooling passage 22, a coolant in the piston rod 3a circulate. For supplying the coolant, a coolant line 21 is provided. The coolant 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.

In Figur 3 ist eine Draufsicht auf die Anordnung aus Figur 2 gezeigt. Die AbstĆ¼tzung des Befestigungskopfs 8 in der Lagerpfanne 9 erfolgt durch je vier rotationssymmetrisch angeordnete Federn 11, welche in Federaufnahmen des AnschlussstĆ¼cks 10 angeordnet sind und durch vier rotationssymmetrisch angeordnete Federn 12, welche in VerschlussstĆ¼ck 30 angeordnet sind. Die Verbindung zwischen VerschlussstĆ¼ck 30 und AnschlussstĆ¼ck 10 erfolgt Ć¼ber acht Schrauben 17.FIG. 3 shows a top view of the arrangement from FIG. 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. The connection between the closure piece 30 and fitting 10 via eight screws 17th

Claims (13)

Vorrichtung (1) zum Herstellen von Formteilen, insbesondere zum Druckgiessen in einem Kaltkammerverfahren, insbesondere zum Aluminiumdruckgiessen,
mit einer Gaskammer (2) in welche eine Schmelze (S) zufĆ¼hrbar ist,
mit einem Giesskolben (3b) zum DrĆ¼cken der Schmelze (S) in eine Gussform (4a, 4b) und mit einer Kolbenstange (3b) fĆ¼r den Giesskolben (3b)
und mit einem Antriebsaggregat (5) zum BetƤtigen des Giesskolbens (3)
wobei die Vorrichtung mit wenigstens einem Schwingungserzeuger (6) versehen ist, mittels welchem die Kolbenstange (3a) in LƤngsschwingungen versetzbar ist,
dadurch gekennzeichnet, dass die Kolbenstange (3a) beweglich mit dem Antriebsaggregat (5) verbunden oder verbindbar ist.Device (1) for producing molded parts, in particular for die casting in a cold chamber method, in particular for aluminum diecasting,
with a gas chamber (2) into which a melt (S) can be fed,
with a casting piston (3b) for pressing the melt (S) into a casting mold (4a, 4b) and with a piston rod (3b) for the casting piston (3b)
and with a drive unit (5) for actuating the casting piston (3)
the device being provided with at least one vibration generator (6) by means of which the piston rod (3a) can be displaced longitudinally,
characterized in that the piston rod (3a) is movably connected to the drive unit (5) or connectable. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Kolbenstange (3a) in LƤngsrichtung (L) beweglich, insbesondere mit einer vorbestimmten Federkraft zum Erzeugen eines Gegendrucks federnd mit dem Antriebsaggregat (5) verbunden ist.Apparatus according to claim 1, characterized in that the piston rod (3a) in the longitudinal direction (L) is movable, in particular with a predetermined spring force for generating a counter-pressure resiliently connected to the drive unit (5). Vorrichtung nach einem der AnsprĆ¼che 1 oder 2, dadurch gekennzeichnet, dass die Kolbenstange (3a) gelenkig mit dem Antriebsaggregat (5) verbunden ist.Device according to one of claims 1 or 2, characterized in that the piston rod (3a) is pivotally connected to the drive unit (5). Vorrichtung nach Anspruch 2 und 3, dadurch gekennzeichnet, dass die Kolbenstange (3a) an einem Ende (7) einen wenigstens teilweise abgerundeten Befestigungskopf (8) aufweist, welcher federnd in einer Lagerpfanne (9) an einem AnschlussstĆ¼ck (10) des Antriebsaggregats (5) gelagert ist.Apparatus according to claim 2 and 3, characterized in that the piston rod (3a) at one end (7) has an at least partially rounded mounting head (8) which resiliently in a bearing cup (9) on a connecting piece (10) of the drive unit (5 ) is stored. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass der Befestigungskopf (8) in LƤngsrichtung (L) durch ein Federpaket (11, 12) in AnschlussstĆ¼ck (10) gehalten ist.Apparatus according to claim 4, characterized in that the fastening head (8) in the longitudinal direction (L) by a spring assembly (11, 12) in the connecting piece (10) is held. Vorrichtung nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass der Befestigungskopf (8) mit Mitteln (13) zur Reduktion der Reibung zwischen einer OberflƤche (14) des Befestigungskopfs (8) und einer InnenflƤche (16) der Lagerpfanne (9), insbesondere mit einem Gleitring, versehen ist.Apparatus according to claim 4 or 5, characterized in that the fastening head (8) with means (13) for reducing the friction between a surface (14) of the fastening head (8) and an inner surface (16) of the bearing cup (9), in particular with a sliding ring is provided. Vorrichtung nach einem der AnsprĆ¼che 4 bis 6, dadurch gekennzeichnet, dass die OberflƤche (14) der Lagerpfanne (9) aus einem Material mit im Vergleich zum Befestigungskopf (8) grƶsserer HƤrte besteht, dass die OberflƤche (14) der Lagerpfanne (9) insbesondere hart verchromt oder ionitriert ist.Device according to one of claims 4 to 6, characterized in that the surface (14) of the bearing cup (9) consists of a material with compared to the mounting head (8) greater hardness that the surface (14) of the bearing cup (9) in particular hard chromed or ion-plated. Vorrichtung nach einem der AnsprĆ¼che 4 bis 7, dadurch gekennzeichnet, dass die Lagerpfanne (9) mit wenigstens einer EntlĆ¼ftungsƶffnung (15) versehen ist.Device according to one of claims 4 to 7, characterized in that the bearing cup (9) is provided with at least one vent opening (15). Vorrichtung, insbesondere nach einem der AnsprĆ¼che 1 bis 8, insbesondere zum Druckgiessen in einem Kaltkammerverfahren, insbesondere zum Aluminiumdruckgiessen,
mit einer Giesskammer (2) in welche eine Schmelze (S) zufĆ¼hrbar ist,
mit einem Giesskolben (3b) zum DrĆ¼cken der Schmelze (S) in eine Gussform (4a, 4b), mit einer Kolbenstange (3a)
und mit einem Antriebsaggregat (5) zum BetƤtigen der Kolbenstange (3a)
wobei die Vorrichtung mit wenigstens einem Schwingungserzeuger (6) versehen ist, mittels welchem der Giesskolben (3b) in LƤngsschwingungen versetzbar ist,
dadurch gekennzeichnet, dass der Schwingungserzeuger (6) direkt am Giesskolben (3b) oder an der Kolbenstange (3a) angebracht ist.Device, in particular according to one of claims 1 to 8, in particular for die casting in a cold chamber method, in particular for aluminum die-casting,
with a casting chamber (2) into which a melt (S) can be fed,
with a casting piston (3b) for pressing the melt (S) into a casting mold (4a, 4b), with a piston rod (3a)
and with a drive unit (5) for actuating the piston rod (3a)
the device being provided with at least one vibration generator (6) by means of which the casting piston (3b) is longitudinally oscillatable,
characterized in that the vibration generator (6) is mounted directly on the casting piston (3b) or on the piston rod (3a). Vorrichtung nach einem der AnsprĆ¼che 1 bis 9, wobei die Kolbenstange (3a) in Betriebslage im Wesentlichen horizontal verlƤuft, dadurch gekennzeichnet dass der Schwingungserzeuger (6) in Betriebslage senkrecht nach unten gerichtet an der Kolbenstange (3a) angebracht ist.Device according to one of claims 1 to 9, wherein the piston rod (3a) in the operating position substantially horizontally, characterized in that the vibration generator (6) in the operating position directed vertically downwards on the piston rod (3a) is mounted. Vorrichtung nach einem der AnsprĆ¼che 1 bis 10, dadurch gekennzeichnet, dass der Schwingungserzeuger (6) zur Erzeugung von Schwingungen im Bereich von 5Hz bis 100Hz, vorzugsweise 30Hz bis 50Hz ausgebildet ist.Device according to one of claims 1 to 10, characterized in that the vibration generator (6) for generating vibrations in the range of 5Hz to 100Hz, preferably 30Hz to 50Hz is formed. Verfahren zum Herstellen eines Formteils, insbesondere mit einer Vorrichtung nach einem der AnsprĆ¼che 1 bis 11, bestehend aus den Schritten - EinfĆ¼hren einer Schmelze (S) in eine Giesskammer (2) - DrĆ¼cken der Schmelze (S) in eine Gussform (4a, 4b) mittels eines Giesskolbens (3b), wobei in einer Bewegungsphase die Schmelze (S) aus der
Giesskammer (2) in Richtung Gussform (4a, 4b) bewegt wird und
wobei in einer Schussphase die Schmelze (S) mit Druck in die Gussform (4a, 4b) gedrĆ¼ckt wird,
dadurch gekennzeichnet, dass der Giesskolben (3b) oder eine den Giesskolben (3b) haltende Kolbenstange (3a) in der Bewegungsphase in LƤngsrichtung (L) mit Schwingungen beaufschlagt wird.Method for producing a molded part, in particular with a device according to one of claims 1 to 11, consisting of the steps - Introducing a melt (S) in a casting chamber (2) Pressing the melt (S) into a casting mold (4a, 4b) by means of a casting piston (3b), wherein in a movement phase, the melt (S) from the
Casting chamber (2) in the direction of the casting mold (4a, 4b) is moved and
wherein in a firing phase the melt (S) is pressed with pressure into the casting mold (4a, 4b),
characterized in that the casting piston (3b) or the casting piston (3b) holding piston rod (3a) is acted upon in the movement phase in the longitudinal direction (L) with vibrations. Verfahren nach Anspruch 12, dadurch gekennzeichnet, dass die Kolbenstange (3a) unabhƤngig von einem Antriebsaggregat (5) zum Bewegen der Kolbenstange (3a) wƤhrend der Bewegungsphase in Schwingungen versetzt wird.Method according to Claim 12, characterized in that the piston rod (3a) is independent of a drive unit (5). for moving the piston rod (3a) during the movement phase is vibrated.
EP04023277A 2004-09-30 2004-09-30 Apparatus and process for the production of compacts Expired - Lifetime EP1642660B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP04023277A EP1642660B1 (en) 2004-09-30 2004-09-30 Apparatus and process for the production of compacts
DE502004006725T DE502004006725D1 (en) 2004-09-30 2004-09-30 Apparatus and method for producing molded parts
AT04023277T ATE390973T1 (en) 2004-09-30 2004-09-30 DEVICE AND METHOD FOR PRODUCING MOLDED PARTS
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 (en) 2004-09-30 2004-09-30 Apparatus and process for the production of compacts

Publications (2)

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EP1642660A1 true EP1642660A1 (en) 2006-04-05
EP1642660B1 EP1642660B1 (en) 2008-04-02

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EP (1) EP1642660B1 (en)
AT (1) ATE390973T1 (en)
DE (1) DE502004006725D1 (en)

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CN106984793A (en) * 2017-06-08 2017-07-28 ę±Ÿč‹åŽę™Ÿē”µę°”ē§‘ęŠ€ęœ‰é™å…¬åø One kind vibrations froth breaking die casting machine injecting device
CN112893800A (en) * 2021-01-20 2021-06-04 č¾½å®å‡Æę–‡ä¼—é‘«č£…å¤‡åˆ¶é€ ęœ‰é™å…¬åø Inclined pressure chamber

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DE502004006725D1 (en) 2008-05-15
EP1642660B1 (en) 2008-04-02
ATE390973T1 (en) 2008-04-15
US20060065384A1 (en) 2006-03-30
US7290590B2 (en) 2007-11-06

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