EP2062667B1 - Plunger bar for a casting machine - Google Patents

Plunger bar for a casting machine Download PDF

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Publication number
EP2062667B1
EP2062667B1 EP08020498.5A EP08020498A EP2062667B1 EP 2062667 B1 EP2062667 B1 EP 2062667B1 EP 08020498 A EP08020498 A EP 08020498A EP 2062667 B1 EP2062667 B1 EP 2062667B1
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EP
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Prior art keywords
casting
base body
bore
coupler
cooling channel
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EP08020498.5A
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German (de)
French (fr)
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EP2062667A2 (en
EP2062667A3 (en
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Friedrich Prof. Dr. H. C. Klein
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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
    • 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
    • B22D17/2038—Heating, cooling or lubricating the injection unit

Definitions

  • the invention relates to a use of a piston rod as a casting piston rod for a casting machine, in particular for a die casting machine, and to a correspondingly equipped casting machine.
  • hot chamber die casting machines are used for the die casting process, in particular for casting zinc and magnesium alloys, as well as cold chamber die casting machines, in particular for casting aluminum and magnesium alloys.
  • the melts of Al, Zn, Mg and other alloys or casting materials having an adjustable flow rate in a range of, for example, between about 20m / s and about 100m / s or more in a mold-filling phase within a relatively short mold-filling time usually poured between about 5ms and about 300ms in metallic permanent molds.
  • the die casting process typically takes place in three phases, namely a prefilling phase in which the melt is preferably conveyed to the so-called bleed, the short mold-filling phase and a holding-pressure phase in which the melt is under an adjustable high holding pressure of, for example, between about 100 bar to about 1,500 bar solidifies.
  • the kinetic energy of the melt for filling a mold cavity usually formed by a fixed and a movable mold half is usually applied via hydraulic casting units of the die casting machine, wherein a corresponding overall system of hydraulic fluid, hydraulic piston, G confusekolbenstange, casting piston and melt with adjustable speed both in the Vor colllphase than is also moved in the mold filling phase.
  • system speeds of more than 10 m / s can be set depending on the machine type. Since the melts are practically incompressible, at the end of the mold filling phase, the casting piston practically travels to a "fixed wall", in terms of energy and momentum.
  • the kinetic energy of the entire moving system which is proportional to its mass multiplied by the square of velocity, is converted abruptly into a pressure pulse and then into heat.
  • the casting piston rod usually consists of a steel material and has a considerable proportion of the total mass of the moving system.
  • the patent DE 199 01 868 B4 discloses for use in a die casting machine a casting piston rod having a central axial blind bore for weight reduction and laterally therefrom an axial coolant supply passage and an axial coolant discharge passage.
  • the blind bore On the side of a casting piston to be coupled, the blind bore is closed by an insert on which a casting piston leading axial cooling tube is set.
  • the cooling tube communicates via a first connecting channel in the insert with theméffenzu Switzerlandkanal in communication, and an annular gap between the cooling tube and the surrounding cylindrical wall of the cylindrical insert is connected via a second connecting channel in the insert with thehariffenab 2018,kanal in combination.
  • the reduced weight of the piston rod due to the axial blind bore is said to cause weight-related frictional wear between the generally horizontally disposed casting piston and an associated filling chamber reduce.
  • the patent CH 417 863 discloses a die-casting machine with a hydraulic shot unit comprising a drive piston displaceable in a cylinder, which is integrally provided with a piston rod carrying a casting piston.
  • Drive piston and casting piston rod are made in lightweight material, preferably a light metal, such as an aluminum alloy, alternatively made of pressure-resistant plastic material or a hollow lightweight steel construction.
  • the casting piston is made of a high temperature resistant material, such as a porcelain material.
  • the layout DE 1 291 864 discloses a hydraulic shot unit for die casting machines with a purpose for mass reduction hollow cylindrical casting piston rod, which is provided on the drive side with a massearm running drive piston and carries at its other end a hollow cylindrical shaped casting piston.
  • the Utility Model DE 297 03 444 U1 discloses a piston rod for a linear drive, which consists of aluminum material for the purpose of mass reduction and is coated with an anodized cover layer for increased wear resistance.
  • a hollow piston rod which may in particular also be made of a light metal material, is for use in a piston-cylinder assembly with integrated permanent magnet switch in the patent DE 37 34 547 C2 disclosed.
  • the piston rod may be provided at both axial end portions each with an internal thread to at one end a threaded portion connected to the piston and at the other end a couplable with a power take-off connection part screwed.
  • the threaded part and the connecting part may be made of stainless steel, for example.
  • the publication JP 60-250866 A discloses a casting piston rod which is provided at a front end with a shoulder on which a casting piston is placed. At an opposite end, the casting piston rod is provided on the outer circumference with a vibrator element, with which the casting piston rod is put into high-frequency oscillation during the casting process, which transmits to the casting piston.
  • the casting piston introduces this vibration into the molten metal, which should contribute to the quality of the cast product.
  • the casting piston can be cooled with cooling water, for which purpose the cooling water is passed over a longitudinally arranged in a cavity of the casting piston rod cooling tube in a G confusekolbenhohlraum, from where it is again returned axially via a formed between the cooling tube and the cavity wall of the casting piston rod annular channel.
  • JP 07-155925 A discloses coupling a casting piston rod to a drive piston rod using an interposed pressure-resilient element, in particular a coil spring, with associated facing ends of the casting piston rod and drive piston rod being axially relatively movably supported in a surrounding ring housing.
  • the publication JP 2004-216432 A proposes a casting piston rod and connected thereto via a coupling drive piston rod made of a titanium-aluminum-light alloy with an aluminum content between 2.5 wt .-% to 8.35 wt .-% to manufacture in order to achieve relatively high injection rates of more than 2.5 m / s, for example, for aluminum and magnesium die casting.
  • the invention is a technical problem, the use of a piston rod as a casting piston rod, which can be relatively easily finished and, for. is optimized for use in a die casting machine in terms of their contribution to the kinetic energy of the moving casting system to be converted at the end of the mold filling phase and the provision of a correspondingly equipped casting machine.
  • the invention solves this problem by providing a piston rod use with the features of claim 1 and a casting machine with the features of claim 6.
  • the casting piston rod used according to the invention consists wholly or predominantly of a light metal material in the form of a metal alloy with aluminum or magnesium as the main component. In this case, it includes a wholly or predominantly consisting of the light metal material body on which a coupling for coupling a casting piston and / or a coupling for coupling a drive piston are arranged.
  • the pressure pulse amplitude is reduced due to the typically significantly lower modulus of elasticity for a light metal material as compared to steel and other heavy metal materials.
  • the base body is cylindrical, wherein the casting piston coupling are arranged on one cylinder end side and the drive piston coupling on the other cylinder front side.
  • the base body is provided with an axial cooling channel bore. This provides the opportunity to pass a coolant through the plunger rod to cool the same and, when needed, components coupled thereto.
  • the base body has a cooling channel inlet bore and a cooling channel outlet bore, which open out at the base circumference and communicate with the cooling channel bore, so that coolant is introduced into the base body via the inlet bore and discharged therefrom via the outlet bore can be.
  • a cooling tube with the formation of an annular gap and an insert are inserted into the cooling channel bore, wherein the insert connects the cooling tube interior to the inlet bore, while the annular gap opens via the outlet bore.
  • the inlet and the outlet bore may be provided on a same axial half-side of the base body, e.g. on its half facing the drive piston coupling.
  • the casting piston coupling and / or the drive piston coupling may consist of the same material as the base body and be integrally formed on the base body, which allows, for example, the common production of a blank.
  • the in the Fig. 1 to 3 illustrated casting piston rod is suitable for die casting machines of hot chamber and cold chamber type and has a cylindrical base body 1, which is uniform, ie continuous, made of a light metal material.
  • the light metal material is a metal alloy with aluminum or magnesium as the main component. It turns out that this light metal material has grown the requirements for casting piston rods of casting machines, especially with regard to temperature and pressure loads.
  • the use of titanium also comes into consideration as a minority component of a corresponding alloy.
  • a casting piston coupling 2 and on the other end face a drive piston coupling 3 are integrally formed on one end face.
  • the casting piston coupling 2 has a conventional form for coupling a conventional casting piston.
  • the drive piston clutch 3 has a conventional form for coupling a conventional hydraulic piston or other drive piston, such as a cylindrical disk shape.
  • the main body 1 and the two clutches 2, 3 can be manufactured in one piece from a light metal blank.
  • the cylindrical base body 1 is also provided with a continuous central axial bore, which is stepped in two parts, comprising a first, shorter bore portion 4 of larger diameter on the side of the drive piston coupling 3 and a remaining second bore portion 5 of greater length and smaller diameter.
  • the bore serves as a cooling channel bore, wherein in the cylinder surface of the cylindrical base body 1, a radial cooling channel inlet bore 6 and a radial cooling channel outlet bore 7 are introduced.
  • the inlet bore 6 leads from the outside to the first radial bore section 4, while the outlet bore from the second axial bore section 5 leads to the outside.
  • the inlet bore 6 and the outlet bore 7 are both on a same axial half-side of the cylindrical base body 1, on the hydraulic pressure piston to be coupled facing side. This can have advantages in terms of accessibility of the inlet and outlet bores 6, 7 in the installed state of the casting piston rod.
  • Fig. 4 shows the casting piston rod of the Fig. 1 to 3 after insertion of a cooling tube 8 and an insert 10 in the axial bore 4, 5.
  • the cooling tube 8 extends in the second bore portion 5 of the axial cooling channel bore and on the side of the casting piston coupling 2 on the base body 1 addition, to conventional, not here closer to explanatory manner to supply a coupled casting piston coolant, with which the casting piston and the casting piston rod can be tempered.
  • the cooling tube 8 has a smaller outer diameter than the inner diameter of the second bore section 5, so that an annular gap 9 is formed between the cooling tube 8 and the surrounding base body 1.
  • the insert 10 is inserted fluid-tight in the first bore section 4, wherein it closes the annular gap 9 with a front end face 10a frontally. It may consist of the same light metal material as the cylindrical base body 1, but alternatively also of another light metal material or a non-light metal material.
  • the insert 10 has a connection channel 11 which, as shown, includes a radial and an axial portion such that it provides fluid communication between the radial inlet bore 6 and the interior of the cooling tube 8 at its respective front end.
  • a liquid or gaseous coolant from the outside via the inlet bore 6 and the connecting channel 11 are introduced into the interior of the cooling tube 8 and guided by this to the casting piston.
  • the coolant enters the annular channel 9 between the cooling tube 8 and body 1 and is in this by the Base body 1 passed through to the outlet bore 7, via which it then passes out of the casting piston rod out.
  • the outlet bore 7 serves as an inlet and the inlet bore 6 as an outlet of the coolant in or out of the casting piston rod.
  • the casting piston rod of Fig. 1 to 4 a completely made of light metal existing cylindrical body provided on the couplings for coupling a casting piston on the one hand and a drive piston, such as a conventional hydraulic piston, on the other hand integrally formed in a simple manufacturing technology.
  • the axial cooling channel bore with inserted insert and cooling tube enables effective temperature control of the casting piston rod and casting piston. Regardless of the material of the insert and the cooling tube, which make up only a smaller part of the entire G mankolbenstangensystems, so that the casting piston rod in any case predominantly in its volume of light metal.
  • Fig. 5 shows a variant of the casting piston rod of Fig. 1 to 4 , wherein identical reference numerals are used for identical or functionally equivalent elements and in this respect to the above explanations to the Fig. 1 to 4 reference to the functions and benefits of the elements concerned.
  • the casting piston rod of Fig. 5 is different from the one of Fig. 1 to 4 in that a drive piston coupling is provided as a separate component 3 '.
  • This separate drive piston coupling piece 3 ' is made in the example shown in the manner of a cup-shaped end cap with internal thread and on the associated front end of the extent to the example of Fig. 1 to 4 unscrewed modified base body 1, for this purpose in the respective front end with a matching external thread instead of the example in the Fig. 1 to 4 molded drive piston coupling 3 is provided.
  • the drive piston coupling material can be decoupled from the base body 1, ie, for the coupling piece 3' can be selected as needed, a different material than the light metal material of the base body 1.
  • the production of the separate drive piston coupling piece 3 'from a steel material comes into consideration.
  • an optimized adaptation of the still predominantly made of light metal material casting piston rod to the coupling of a conventional hydraulic piston a Druckg screenmaschine be achieved without affecting the advantages associated with the predominant use of light metal material for the casting piston rod, explained above.
  • the drive piston clutch 3 ' as a separate component without the body 1, for example, be replaced during maintenance.
  • any other conventional releasable or non-releasable attachment for attaching the separate drive piston coupling 3 ' may be provided on the base body 1, eg shrinking.
  • the production can be facilitated by the two-part realization of cylindrical body and drive piston coupling.
  • casting piston rod is the only difference to that of Fig. 5 the casting piston coupling realized as a separate component 2 '.
  • the separate casting piston coupling piece 2 ' is attached to the facing end side of the extent modified base body 1, wherein by way of example, a shrinking an annular end of the coupling piece 2' is provided on a frontal stump of the base body 1 such that there is a smooth, flush transition of the outside of body 1 and coupling piece 2 'results.
  • any other conventional fastening can be provided to determine the coupling piece 2 'at the relevant front end of the base body 1, for example by screwing.
  • the separate casting piston coupling piece 2 applies the same advantages as for the separate drive piston coupling piece 3', in particular with regard to material decoupling from the light metal material of the base body 1 and the resulting possibilities of a optimum matching to the needs of the component to be coupled, here the casting piston.
  • manufacture of the casting piston coupling piece 2 'from a steel material may also be provided in this case, which may contribute to increased protection of the light metal base body 1, for example from temperature influences and attack by the melt.
  • the casting piston rod through the light metal base body 1 largely made of light metal material, so that the above for the embodiment of Fig. 1 to 4 explained advantages over conventional, consisting mainly of non-light metal material G mankolbenstangen in the same way on the casting piston rod of Fig. 6 hold true.
  • the casting piston rod can also be mixed of light metal material and non-light metal material, as long as the casting piston rod is still based on volume or weight still predominantly made of light metal material. Even in such alternative embodiments, the predominant use of light metal material results in the advantages explained above with regard to reducing the kinetic energy to be converted and the pressure pulse amplitude at the end of the mold filling phase.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Description

Die Erfindung bezieht sich auf eine Verwendung einer Kolbenstange als Gießkolbenstange für eine Gießmaschine, insbesondere für eine Druckgießmaschine, und auf eine entsprechend ausgerüstete Gießmaschine.The invention relates to a use of a piston rod as a casting piston rod for a casting machine, in particular for a die casting machine, and to a correspondingly equipped casting machine.

Für den Druckgießprozess werden bekanntermaßen sogenannte Warmkammer-Druckgießmaschinen insbesondere zum Gießen von Zink- und Magnesiumlegierungen sowie Kaltkammer-Druckgießmaschinen insbesondere zum Gießen von Aluminium- und Magnesiumlegierungen eingesetzt. Beim Druckgießprozess mit heutigen modernen Druckgießmaschinen werden die Schmelzen aus Al, Zn, Mg und anderen Legierungen bzw. Gießmaterialien mit einer einstellbaren Strömungsgeschwindigkeit in einem Bereich von z.B. zwischen etwa 20m/s und etwa 100m/s oder mehr in einer Formfüllphase innerhalb einer relativ kurzen Formfüllzeit meist zwischen etwa 5ms und etwa 300ms in metallische Dauerformen gegossen. Der Druckgießprozess läuft typischerweise in drei Phasen ab, und zwar einer Vorfüllphase, bei der die Schmelze bevorzugt bis zum sogenannten Anschnitt gefördert wird, der kurzen Formfüllphase und einer Nachdruckphase, in der die Schmelze unter einem einstellbaren hohen Nachdruck von z.B. zwischen etwa 100 bar bis etwa 1.500 bar erstarrt.As is known, what are known as hot chamber die casting machines are used for the die casting process, in particular for casting zinc and magnesium alloys, as well as cold chamber die casting machines, in particular for casting aluminum and magnesium alloys. In the die casting process with today's modern die casting machines, the melts of Al, Zn, Mg and other alloys or casting materials having an adjustable flow rate in a range of, for example, between about 20m / s and about 100m / s or more in a mold-filling phase within a relatively short mold-filling time usually poured between about 5ms and about 300ms in metallic permanent molds. The die casting process typically takes place in three phases, namely a prefilling phase in which the melt is preferably conveyed to the so-called bleed, the short mold-filling phase and a holding-pressure phase in which the melt is under an adjustable high holding pressure of, for example, between about 100 bar to about 1,500 bar solidifies.

Die Bewegungsenergie der Schmelze zum Füllen eines in der Regel von einer festen und einer beweglichen Formhälfte gebildeten Formhohlraumes wird meist über hydraulische Gießeinheiten der Druckgießmaschine aufgebracht, wobei ein entsprechendes Gesamtsystem aus Hydraulikflüssigkeit, Hydraulikkolben, Gießkolbenstange, Gießkolben und Schmelze mit einstellbarer Geschwindigkeit sowohl in der Vorfüllphase als auch in der Formfüllphase bewegt wird. In der Formfüllphase können Systemgeschwindigkeiten von je nach Maschinentyp mehr als 10m/s eingestellt werden. Da die Schmelzen praktisch inkompressibel sind, fährt der Gießkolben am Ende der Formfüllphase unter Energie- und Impulsgesichtspunkten praktisch auf eine "feststehende Wand", d.h. die kinetische Energie des bewegten Gesamtsystems, die proportional zu dessen Masse multipliziert mit dem Geschwindigkeitsquadrat ist, wird schlagartig in einen Druckimpuls und anschließend in Wärme umgewandelt. Bei herkömmlichen Druckgießmaschinen besteht die Gießkolbenstange üblicherweise aus einem Stahlmaterial und hat einen erheblichen Anteil an der Gesamtmasse des bewegten Systems.The kinetic energy of the melt for filling a mold cavity usually formed by a fixed and a movable mold half is usually applied via hydraulic casting units of the die casting machine, wherein a corresponding overall system of hydraulic fluid, hydraulic piston, Gießkolbenstange, casting piston and melt with adjustable speed both in the Vorfüllphase than is also moved in the mold filling phase. In the mold filling phase, system speeds of more than 10 m / s can be set depending on the machine type. Since the melts are practically incompressible, at the end of the mold filling phase, the casting piston practically travels to a "fixed wall", in terms of energy and momentum. the kinetic energy of the entire moving system, which is proportional to its mass multiplied by the square of velocity, is converted abruptly into a pressure pulse and then into heat. In conventional die casting machines, the casting piston rod usually consists of a steel material and has a considerable proportion of the total mass of the moving system.

Die Patentschrift DE 199 01 868 B4 offenbart zur Verwendung in einer Druckgießmaschine eine Gießkolbenstange, die eine mittige axiale Sackbohrung zwecks Gewichtsreduktion sowie seitlich von dieser einen axialen Kühlmittelzuführkanal und einen axialen Kühlmittelabführkanal aufweist. Auf Seiten eines anzukoppelnden Gießkolbens ist die Sackbohrung von einem Einsatzstück abgeschlossen, an dem ein zum Gießkolben führendes axiales Kühlrohr festgelegt ist. Das Kühlrohr steht über einen ersten Verbindungskanal im Einsatzstück mit dem Kühlmittelzuführkanal in Verbindung, und ein Ringspalt zwischen Kühlrohr und umgebender Zylinderwand des zylindrischen Einsatzstücks steht über einen zweiten Verbindungskanal im Einsatzstück mit dem Kühlmittelabführkanal in Verbindung. Das aufgrund der axialen Sackbohrung reduzierte Gewicht der Kolbenstange soll gewichtsbedingten Reibungsverschleiß zwischen dem in der Regel horizontal angeordneten Gießkolben und einer zugeordneten Füllkammer mindern.The patent DE 199 01 868 B4 discloses for use in a die casting machine a casting piston rod having a central axial blind bore for weight reduction and laterally therefrom an axial coolant supply passage and an axial coolant discharge passage. On the side of a casting piston to be coupled, the blind bore is closed by an insert on which a casting piston leading axial cooling tube is set. The cooling tube communicates via a first connecting channel in the insert with the Kühlmittelzuführkanal in communication, and an annular gap between the cooling tube and the surrounding cylindrical wall of the cylindrical insert is connected via a second connecting channel in the insert with the Kühlmittelabführkanal in combination. The reduced weight of the piston rod due to the axial blind bore is said to cause weight-related frictional wear between the generally horizontally disposed casting piston and an associated filling chamber reduce.

Die Patentschrift CH 417 863 offenbart eine Druckgießmaschine mit hydraulischer Schusseinheit, die einen in einem Zylinder verschiebbaren Antriebskolben umfasst, der einstückig mit einer Kolbenstange versehen ist, welche einen Gießkolben trägt. Antriebskolben und Gießkolbenstange sind in Leichtmaterial ausgeführt, vorzugsweise einem Leichtmetall, wie einer Aluminiumlegierung, alternativ aus druckfestem Kunststoffmaterial oder einer hohlen Leichtstahl-Konstruktion. Der Gießkolben ist aus einem hoch temperaturbeständigen Material gefertigt, z.B. einem Porzellanmaterial.The patent CH 417 863 discloses a die-casting machine with a hydraulic shot unit comprising a drive piston displaceable in a cylinder, which is integrally provided with a piston rod carrying a casting piston. Drive piston and casting piston rod are made in lightweight material, preferably a light metal, such as an aluminum alloy, alternatively made of pressure-resistant plastic material or a hollow lightweight steel construction. The casting piston is made of a high temperature resistant material, such as a porcelain material.

Die Auslegeschrift DE 1 291 864 offenbart eine hydraulische Schusseinheit für Druckgießmaschinen mit einer zwecks Massereduktion hohlzylindrisch ausgeführten Gießkolbenstange, die antriebsseitig mit einem massearm ausgeführten Antriebskolben versehen ist und die an ihrem anderen Ende einen hohlzylindrisch gestalteten Gießkolben trägt.The layout DE 1 291 864 discloses a hydraulic shot unit for die casting machines with a purpose for mass reduction hollow cylindrical casting piston rod, which is provided on the drive side with a massearm running drive piston and carries at its other end a hollow cylindrical shaped casting piston.

Die Gebrauchsmusterschrift DE 297 03 444 U1 offenbart eine Kolbenstange für einen Linearantrieb, die zwecks Massereduktion aus Aluminiummaterial besteht und zwecks erhöhter Verschleißfestigkeit mit einer Eloxier-Deckschicht überzogen ist.The Utility Model DE 297 03 444 U1 discloses a piston rod for a linear drive, which consists of aluminum material for the purpose of mass reduction and is coated with an anodized cover layer for increased wear resistance.

Eine hohle Kolbenstange, die insbesondere auch aus einem Leichtmetallmaterial gefertigt sein kann, ist zur Verwendung in einem Kolben-Zylinder-Aggregat mit integriertem Dauermagnet-Schalter in der Patentschrift DE 37 34 547 C2 offenbart. Die Kolbenstange kann an beiden axialen Endbereichen jeweils mit einem Innengewinde versehen sein, um am einen Ende ein mit dem Kolben verbundenes Gewindeteil und am anderen Ende ein mit einer Kraftabnahme koppelbares Verbindungsteil einzuschrauben. Das Gewindeteil und das Verbindungsteil können z.B. aus Edelstahl gefertigt sein.A hollow piston rod, which may in particular also be made of a light metal material, is for use in a piston-cylinder assembly with integrated permanent magnet switch in the patent DE 37 34 547 C2 disclosed. The piston rod may be provided at both axial end portions each with an internal thread to at one end a threaded portion connected to the piston and at the other end a couplable with a power take-off connection part screwed. The threaded part and the connecting part may be made of stainless steel, for example.

Die Offenlegungsschrift JP 60-250866 A offenbart eine Gießkolbenstange, die an einem Stirnende mit einem Absatz versehen ist, auf den ein Gießkolben aufgesetzt ist. An einem gegenüberliegenden Stirnende ist die Gießkolbenstange am Außenumfang mit einem Vibratorelement versehen, mit dem die Gießkolbenstange während des Gießvorgangs in hochfrequente Schwingung versetzt wird, die sich auf den Gießkolben überträgt. Der Gießkolben leitet diese Schwingung in die Metallschmelze ein, was zur Qualitätserhöhung des gegossenen Produkts beitragen soll. Der Gießkolben kann mit Kühlwasser gekühlt werden, wozu das Kühlwasser über ein längsmittig in einem Hohlraum der Gießkolbenstange angeordnetes Kühlrohr in einen Gießkolbenhohlraum geführt wird, von wo es über einen zwischen dem Kühlrohr und der Hohlraumwandung der Gießkolbenstange gebildeten Ringkanal wieder axial zurückgeleitet wird.The publication JP 60-250866 A discloses a casting piston rod which is provided at a front end with a shoulder on which a casting piston is placed. At an opposite end, the casting piston rod is provided on the outer circumference with a vibrator element, with which the casting piston rod is put into high-frequency oscillation during the casting process, which transmits to the casting piston. The casting piston introduces this vibration into the molten metal, which should contribute to the quality of the cast product. The casting piston can be cooled with cooling water, for which purpose the cooling water is passed over a longitudinally arranged in a cavity of the casting piston rod cooling tube in a Gießkolbenhohlraum, from where it is again returned axially via a formed between the cooling tube and the cavity wall of the casting piston rod annular channel.

Es sind auch bereits verschiedene andere Gießkolbenstangen vorgeschlagen worden, die eine Gießkolbenkühlung ermöglichen, indem ein entsprechendes Kühlmittel über Zu- und Ablaufkanäle der zugehörigen Gießkolbenstange geführt wird, siehe beispielsweise die Offenlegungsschriften JP 2000-158114 A , JP 01-095858 A und EP 0 394 988 A2 .Various other casting piston rods have also been proposed which permit casting piston cooling by passing a corresponding coolant through inlet and outlet channels of the associated casting piston rod, see, for example, the published patent applications JP 2000-158114 A . JP 01-095858 A and EP 0 394 988 A2 ,

Die Offenlegungsschrift JP 07-155925 A offenbart das Kuppeln einer Gießkolbenstange mit einer Antriebskolbenstange unter Verwendung eines zwischengefügten, auf Druck belastbaren elastischen Elements, insbesondere einer Schraubenfeder, wobei zugehörige, einander zugewandte Enden von Gießkolbenstange und Antriebskolbenstange in einem umgebenden Ringgehäuse axial relativbeweglich gehalten sind.The publication JP 07-155925 A discloses coupling a casting piston rod to a drive piston rod using an interposed pressure-resilient element, in particular a coil spring, with associated facing ends of the casting piston rod and drive piston rod being axially relatively movably supported in a surrounding ring housing.

Die Offenlegungsschrift JP 2004-216432 A schlägt vor, eine Gießkolbenstange und eine mit dieser über eine Kopplung verbundene Antriebskolbenstange aus einer Titan-Aluminium-Leichtmetalllegierung mit einem Aluminiumanteil zwischen 2,5 Gew.-% bis 8,35 Gew.-% zu fertigen, um relativ hohe Injektionsgeschwindigkeiten von mehr als 2,5 m/s z.B. für Aluminium- und Magnesiumdruckguss erzielen zu können.The publication JP 2004-216432 A proposes a casting piston rod and connected thereto via a coupling drive piston rod made of a titanium-aluminum-light alloy with an aluminum content between 2.5 wt .-% to 8.35 wt .-% to manufacture in order to achieve relatively high injection rates of more than 2.5 m / s, for example, for aluminum and magnesium die casting.

Der Erfindung liegt als technisches Problem die Verwendung einer Kolbenstange als Gießkolbenstange, die sich relativ einfach fertigen lässt und z.B. bei Einsatz in einer Druckgießmaschine hinsichtlich ihres Beitrags zur am Ende der Formfüllphase umzuwandelnden kinetischen Energie des sie enthaltenden bewegten Gießsystems optimiert ist, sowie die Bereitstellung einer entsprechend ausgerüsteten Gießmaschine zugrunde.The invention is a technical problem, the use of a piston rod as a casting piston rod, which can be relatively easily finished and, for. is optimized for use in a die casting machine in terms of their contribution to the kinetic energy of the moving casting system to be converted at the end of the mold filling phase and the provision of a correspondingly equipped casting machine.

Die Erfindung löst dieses Problem durch die Bereitstellung einer Kolbenstangenverwendung mit den Merkmalen des Anspruchs 1 und einer Gießmaschine mit den Merkmalen des Anspruchs 6. Die erfindungsgemäß eingesetzte Gießkolbenstange besteht ganz oder überwiegend aus einem Leichtmetallmaterial in Form einer Metalllegierung mit Aluminium oder Magnesium als Hauptbestandteil. Dabei beinhaltet sie einen ganz oder überwiegend aus dem Leichtmetallmaterial bestehenden Grundkörper, an dem eine Kupplung zur Ankopplung eines Gießkolbens und/oder eine Kupplung zur Ankopplung eines Antriebskolbens angeordnet sind. Dies bedeutet im Vergleich zu herkömmlichen Gießkolbenstangen aus Stahlmaterial eine signifikante Gewichtsreduktion der Gießkolbenstange und damit der Gesamtmasse des bewegten Systems, was wiederum die am Ende der Formfüllphase umzuwandelnde kinetische Energie bei Einsatz in einer Druckgießmaschine deutlich herabsetzt. Außerdem wird die Druckimpulsamplitude aufgrund des für ein Leichtmetallmaterial im Vergleich zu Stahl- und anderen Schwermetallmaterialien typischerweise deutlich geringeren Elastizitätsmoduls reduziert.The invention solves this problem by providing a piston rod use with the features of claim 1 and a casting machine with the features of claim 6. The casting piston rod used according to the invention consists wholly or predominantly of a light metal material in the form of a metal alloy with aluminum or magnesium as the main component. In this case, it includes a wholly or predominantly consisting of the light metal material body on which a coupling for coupling a casting piston and / or a coupling for coupling a drive piston are arranged. This means a significant weight reduction of the casting piston rod and thus of the total mass of the moving system compared to conventional casting piston rods made of steel material, which in turn significantly reduces the kinetic energy to be converted at the end of the mold filling phase when used in a die casting machine. In addition, the pressure pulse amplitude is reduced due to the typically significantly lower modulus of elasticity for a light metal material as compared to steel and other heavy metal materials.

Erfindungsgemäß besteht die Gießkolben-Kupplung und/oder die Antriebskolben-Kupplung aus einem anderen Material wie der Grundkörper und ist als separates Bauteil am Grundkörper angebracht. Dies ermöglicht eine materialtechnische Entkopplung der jeweiligen Kupplung vom Grundkörper, so dass die Kupplung bei Bedarf in ihrem Material an spezifische Anforderungen angepasst werden kann.According to the invention, the casting piston coupling and / or the drive piston coupling of a different material as the base body and is attached as a separate component on the base body. this makes possible a material-technical decoupling of the respective coupling from the body, so that the coupling can be adapted in their material to specific requirements, if necessary.

In einer Ausgestaltung der Erfindung ist der Grundkörper zylindrisch, wobei an einer Zylinderstirnseite die Gießkolben-Kupplung und an der anderen Zylinderstirnseite die Antriebskolben-Kupplung angeordnet sind.In one embodiment of the invention, the base body is cylindrical, wherein the casting piston coupling are arranged on one cylinder end side and the drive piston coupling on the other cylinder front side.

In einer weiteren Ausgestaltung der Erfindung ist der Grundkörper mit einer axialen Kühlkanalbohrung versehen. Dies bietet die Möglichkeit, ein Kühlmittel durch die Gießkolbenstange hindurchzuleiten, um selbige und bei Bedarf daran angekoppelte Komponenten zu kühlen.In a further embodiment of the invention, the base body is provided with an axial cooling channel bore. This provides the opportunity to pass a coolant through the plunger rod to cool the same and, when needed, components coupled thereto.

In einer Weiterbildung dieser Maßnahme weist der Grundkörper eine Kühlkanal-Zulaufbohrung und eine Kühlkanal-Auslaufbohrung auf, die am Grundkörperumfang ausmünden und mit der Kühlkanalbohrung in Verbindung stehen, so dass entsprechend Kühlmittel über die Zulaufbohrung in den Grundkörper eingeleitet und aus diesem über die Auslaufbohrung wieder ausgeleitet werden kann.In a further development of this measure, the base body has a cooling channel inlet bore and a cooling channel outlet bore, which open out at the base circumference and communicate with the cooling channel bore, so that coolant is introduced into the base body via the inlet bore and discharged therefrom via the outlet bore can be.

In weiterer Ausgestaltung sind in die Kühlkanalbohrung ein Kühlrohr unter Bildung eines Ringspalts sowie ein Einsatzstück eingesetzt, wobei das Einsatzstück das Kühlrohrinnere an die Zulaufbohrung anschließt, während der Ringspalt über die Auslaufbohrung ausmündet. Dabei können die Zulauf- und die Auslaufbohrung auf einer gleichen axialen Halbseite des Grundkörpers vorgesehen sein, z.B. auf seiner der Antriebskolben-Kupplung zugewandten Hälfte.In a further embodiment, a cooling tube with the formation of an annular gap and an insert are inserted into the cooling channel bore, wherein the insert connects the cooling tube interior to the inlet bore, while the annular gap opens via the outlet bore. In this case, the inlet and the outlet bore may be provided on a same axial half-side of the base body, e.g. on its half facing the drive piston coupling.

In weiterer Ausgestaltung der Erfindung kann die Gießkolben-Kupplung und/oder die Antriebskolben-Kupplung aus dem gleichen Material wie der Grundkörper bestehen und einteilig am Grundkörper ausgebildet sein, was z.B. die gemeinsame Fertigung aus einem Rohling ermöglicht.In a further embodiment of the invention, the casting piston coupling and / or the drive piston coupling may consist of the same material as the base body and be integrally formed on the base body, which allows, for example, the common production of a blank.

Vorteilhafte Ausbildungsformen der Erfindung sind in den Zeichnungen dargestellt und werden nachfolgend beschrieben. Hierbei zeigen:

Fig. 1
eine Seitenansicht einer Gießkolbenstange aus Leichtmetall mit beidseitig einteilig angeformten Kupplungen,
Fig. 2
eine Querschnittansicht längs einer Linie II-II von Fig. 1,
Fig. 3
eine Querschnittansicht längs einer Linie III-III von Fig. 1,
Fig. 4
eine Schnittansicht entsprechend Fig. 2 mit eingesetztem Kühlrohr,
Fig. 5
eine Schnittansicht entsprechend Fig. 4 für eine Variante mit einer als separates Bauteil realisierten Antriebskolben-Kupplung und
Fig. 6
eine Schnittansicht entsprechend Fig. 4 für eine Variante mit als separate Bauteile realisierten Antriebskolben- und Gießkolben-Kupplungen.
Advantageous embodiments of the invention are illustrated in the drawings and will be described below. Hereby show:
Fig. 1
a side view of a casting piston rod made of light metal with integrally formed on both sides clutches,
Fig. 2
a cross-sectional view along a line II-II of Fig. 1 .
Fig. 3
a cross-sectional view along a line III-III of Fig. 1 .
Fig. 4
a sectional view accordingly Fig. 2 with inserted cooling tube,
Fig. 5
a sectional view accordingly Fig. 4 for a variant with a realized as a separate component drive piston clutch and
Fig. 6
a sectional view accordingly Fig. 4 for a variant with realized as separate components Antriebskolben- and casting piston couplings.

Die in den Fig. 1 bis 3 veranschaulichte Gießkolbenstange eignet sich für Druckgießmaschinen vom Warmkammer- und Kaltkammertyp und weist einen zylindrischen Grundkörper 1 auf, der einheitlich, d.h. durchgehend, aus einem Leichtmetallmaterial gefertigt ist. Das Leichtmetallmaterial ist eine Metalllegierung mit Aluminium oder Magnesium als Hauptbestandteil. Es zeigt sich, dass dieses Leichtmetallmaterial den für Gießkolbenstangen von Gießmaschinen bestehenden Anforderungen insbesondere hinsichtlich Temperatur- und Druckbelastungen gewachsen ist. Auch der Einsatz von Titan kommt als eine Minoritätskomponente einer entsprechenden Legierung in Betracht.The in the Fig. 1 to 3 illustrated casting piston rod is suitable for die casting machines of hot chamber and cold chamber type and has a cylindrical base body 1, which is uniform, ie continuous, made of a light metal material. The light metal material is a metal alloy with aluminum or magnesium as the main component. It turns out that this light metal material has grown the requirements for casting piston rods of casting machines, especially with regard to temperature and pressure loads. The use of titanium also comes into consideration as a minority component of a corresponding alloy.

Am zylindrischen Grundkörper 1 sind auf einer Stirnseite eine Gießkolben-Kupplung 2 und auf der anderen Stirnseite eine Antriebskolben-Kupplung 3 einteilig angeformt. Die Gießkolben-Kupplung 2 weist eine zum Ankoppeln eines herkömmlichen Gießkolbens übliche Form auf. Ebenso weist die Antriebskolben-Kupplung 3 eine zur Ankopplung eines herkömmlichen Hydraulikkolbens oder anderen Antriebskolbens übliche Form auf, wie eine Zylinderscheibenform. Im Ausführungsbeispiel der Fig. 1 bis 3 lassen sich somit der Grundkörper 1 und die beiden Kupplungen 2, 3 einteilig aus einem Leichtmetall-Rohling fertigen.On the cylindrical base body 1, a casting piston coupling 2 and on the other end face a drive piston coupling 3 are integrally formed on one end face. The casting piston coupling 2 has a conventional form for coupling a conventional casting piston. Likewise, the drive piston clutch 3 has a conventional form for coupling a conventional hydraulic piston or other drive piston, such as a cylindrical disk shape. In the embodiment of Fig. 1 to 3 Thus, the main body 1 and the two clutches 2, 3 can be manufactured in one piece from a light metal blank.

Der zylindrische Grundkörper 1 ist außerdem mit einer durchgehenden zentrischen axialen Bohrung versehen, die zweiteilig abgestuft ist, wobei sie einen ersten, kürzeren Bohrungsabschnitt 4 größeren Durchmessers auf Seiten der Antriebskolben-Kupplung 3 und einen restlichen zweiten Bohrungsabschnitt 5 größerer Länge und kleineren Durchmessers umfasst. Die Bohrung dient als Kühlkanalbohrung, wobei in die Zylindermantelfläche des zylindrischen Grundkörpers 1 eine radiale Kühlkanal-Zulaufbohrung 6 und eine radiale Kühlkanal-Auslaufbohrung 7 eingebracht sind. Dabei führt die Zulaufbohrung 6 von außen zum ersten radialen Bohrungsabschnitt 4, während die Auslaufbohrung vom zweiten axialen Bohrungsabschnitt 5 nach außen führt.The cylindrical base body 1 is also provided with a continuous central axial bore, which is stepped in two parts, comprising a first, shorter bore portion 4 of larger diameter on the side of the drive piston coupling 3 and a remaining second bore portion 5 of greater length and smaller diameter. The bore serves as a cooling channel bore, wherein in the cylinder surface of the cylindrical base body 1, a radial cooling channel inlet bore 6 and a radial cooling channel outlet bore 7 are introduced. In this case, the inlet bore 6 leads from the outside to the first radial bore section 4, while the outlet bore from the second axial bore section 5 leads to the outside.

Wie aus Fig. 1 zu erkennen, befinden sich die Zulaufbohrung 6 und die Auslaufbohrung 7 beide auf einer gleichen axialen Halbseite des zylindrischen Grundkörpers 1, und zwar auf der dem anzukoppelnden Hydraulikdruckkolben zugewandten Seite. Dies kann Vorteile hinsichtlich Zugänglichkeit der Zulauf- und Ablaufbohrung 6, 7 im Einbauzustand der Gießkolbenstange haben.How out Fig. 1 can be seen, the inlet bore 6 and the outlet bore 7 are both on a same axial half-side of the cylindrical base body 1, on the hydraulic pressure piston to be coupled facing side. This can have advantages in terms of accessibility of the inlet and outlet bores 6, 7 in the installed state of the casting piston rod.

Fig. 4 zeigt die Gießkolbenstange der Fig. 1 bis 3 nach Einsetzen eines Kühlrohrs 8 und eines Einsatzstücks 10 in die axiale Bohrung 4, 5. Speziell erstreckt sich das Kühlrohr 8 im zweiten Bohrungsabschnitt 5 der axialen Kühlkanalbohrung und auf Seiten der Gießkolben-Kupplung 2 über den Grundkörper 1 hinaus, um in herkömmlicher, hier nicht näher zu erläuternder Weise einem angekoppelten Gießkolben Kühlmittel zuzuleiten, mit dem der Gießkolben und die Gießkolbenstange temperiert werden können. Das Kühlrohr 8 weist einen gegenüber dem Innendurchmesser des zweiten Bohrungsabschnitts 5 kleineren Außendurchmesser auf, so dass zwischen Kühlrohr 8 und umgebendem Grundkörper 1 ein Ringspalt 9 gebildet ist. Fig. 4 shows the casting piston rod of the Fig. 1 to 3 after insertion of a cooling tube 8 and an insert 10 in the axial bore 4, 5. Specifically, the cooling tube 8 extends in the second bore portion 5 of the axial cooling channel bore and on the side of the casting piston coupling 2 on the base body 1 addition, to conventional, not here closer to explanatory manner to supply a coupled casting piston coolant, with which the casting piston and the casting piston rod can be tempered. The cooling tube 8 has a smaller outer diameter than the inner diameter of the second bore section 5, so that an annular gap 9 is formed between the cooling tube 8 and the surrounding base body 1.

Das Einsatzstück 10 ist in den ersten Bohrungsabschnitt 4 fluiddicht eingesetzt, wobei es mit einer vorderen Stirnseite 10a den Ringspalt 9 stirnseitig abschließt. Es kann aus dem gleichen Leichtmetallmaterial wie der zylindrische Grundkörper 1 bestehen, alternativ aber auch aus einem anderen Leichtmetallmaterial oder einem Nicht-Leichtmetallmaterial. Das Einsatzstück 10 weist einen Verbindungskanal 11 auf, der wie gezeigt einen radialen und einen axialen Abschnitt derart umfasst, dass er eine Fluidverbindung zwischen der radialen Zulaufbohrung 6 und dem Inneren des Kühlrohrs 8 an dessen entsprechendem Stirnende bereitstellt.The insert 10 is inserted fluid-tight in the first bore section 4, wherein it closes the annular gap 9 with a front end face 10a frontally. It may consist of the same light metal material as the cylindrical base body 1, but alternatively also of another light metal material or a non-light metal material. The insert 10 has a connection channel 11 which, as shown, includes a radial and an axial portion such that it provides fluid communication between the radial inlet bore 6 and the interior of the cooling tube 8 at its respective front end.

Auf diese Weise kann ein flüssiges oder gasförmiges Kühlmittel von außen über die Zulaufbohrung 6 und den Verbindungskanal 11 in das Innere des Kühlrohrs 8 eingeleitet und von diesem zum Gießkolben geführt werden. Vom Gießkolben gelangt das Kühlmittel in den Ringkanal 9 zwischen Kühlrohr 8 und Grundkörper 1 und wird in diesem durch den Grundkörper 1 hindurch bis zur Auslaufbohrung 7 geführt, über die es dann wieder aus der Gießkolbenstange heraus gelangt. Es versteht sich, dass je nach Bedarf auch die umgekehrte Führung der Kühlmittelströmung vorgesehen sein kann, d.h. in diesem Alternativfall dient die Auslaufbohrung 7 als Zulauf und die Zulaufbohrung 6 als Auslauf des Kühlmittels in bzw. aus der Gießkolbenstange. Durch das Kühlmittel können die Gießkolbenstange und der angekoppelte Gießkolben in gewünschter Weise temperiert werden, üblicherweise gekühlt, wobei natürlich in gleicher Weise bei Bedarf auch eine Beheizung durch Verwenden eines heißen Kühlmittels möglich ist.In this way, a liquid or gaseous coolant from the outside via the inlet bore 6 and the connecting channel 11 are introduced into the interior of the cooling tube 8 and guided by this to the casting piston. From the casting piston, the coolant enters the annular channel 9 between the cooling tube 8 and body 1 and is in this by the Base body 1 passed through to the outlet bore 7, via which it then passes out of the casting piston rod out. It is understood that, depending on requirements, the reverse guidance of the coolant flow can be provided, ie in this alternative case, the outlet bore 7 serves as an inlet and the inlet bore 6 as an outlet of the coolant in or out of the casting piston rod. By the coolant, the casting piston rod and the coupled casting piston can be tempered in the desired manner, usually cooled, of course, in the same way if necessary, a heating by using a hot coolant is possible.

Vorteilhaft ist somit bei der Gießkolbenstange der Fig. 1 bis 4 ein ganz aus Leichtmetall bestehender zylindrischer Grundkörper vorgesehen, an dem Kupplungen zum Ankuppeln eines Gießkolbens einerseits und eines Antriebskolbens, wie eines üblichen Hydraulikkolbens, andererseits in fertigungstechnisch einfacher Weise einteilig angeformt sind. Die axiale Kühlkanalbohrung mit eingesetztem Einsatzstück und Kühlrohr ermöglicht eine effektive Temperierung von Gießkolbenstange und Gießkolben. Unabhängig vom Material des Einsatzstücks und des Kühlrohrs, die nur einen geringeren Teil des gesamten Gießkolbenstangensystems ausmachen, besteht damit die Gießkolbenstange in ihrem Volumen jedenfalls überwiegend aus Leichtmetall. Dies bedeutet eine signifikante Gewichtsreduzierung der Gießkolbenstange im Vergleich zur herkömmlichen Verwendung von Stahlmaterial und damit eine entsprechende Gewichtsreduzierung des gesamten bewegten Gießsystems aus Hydraulikflüssigkeit, Hydraulikkolben, Gießkolbenstange, Gießkolben und Schmelze. Dementsprechend reduziert sich die am Ende der Formfüllphase umzuwandelnde kinetische Energie des bewegten Gesamtsystems und die dadurch anfallende Wärmemenge. Da das Leichtmetallmaterial zudem im Vergleich zu den für Gießkolbenstangen üblichen Nicht-Leichtmetallmaterialien, wie Stahl, einen deutlich geringeren Elastizitätsmodul aufweist, speziell z.B. Aluminium- und Magnesiumlegierungen, reduziert sich auch die Amplitude des am Ende der Formfüllphase schlagartig auftretenden Druckimpulses. Durch die Verwendung der erfindungsgemäßen Gießkolbenstange lassen sich folglich die bei Verwendung herkömmlicher Gießkolbenstangen aus Stahl oder einem anderen Nicht-Leichtmetallmaterial auftretenden Probleme hinsichtlich hoher umzusetzender kinetischer Energie und hohem Druckimpuls drastisch verringern.Thus, it is advantageous in the casting piston rod of Fig. 1 to 4 a completely made of light metal existing cylindrical body provided on the couplings for coupling a casting piston on the one hand and a drive piston, such as a conventional hydraulic piston, on the other hand integrally formed in a simple manufacturing technology. The axial cooling channel bore with inserted insert and cooling tube enables effective temperature control of the casting piston rod and casting piston. Regardless of the material of the insert and the cooling tube, which make up only a smaller part of the entire Gießkolbenstangensystems, so that the casting piston rod in any case predominantly in its volume of light metal. This means a significant weight reduction of the casting piston rod compared to the conventional use of steel material and thus a corresponding weight reduction of the entire moving casting system of hydraulic fluid, hydraulic piston, casting piston rod, casting piston and melt. Accordingly, the kinetic energy of the moving overall system to be converted at the end of the mold filling phase and the resulting amount of heat is reduced. In addition, since the light metal material has a significantly lower modulus of elasticity than the non-light metal materials customary for casting piston rods, such as steel, especially aluminum and magnesium alloys, for example. also reduces the amplitude of the pressure pulse occurring abruptly at the end of Formfüllphase. Consequently, the use of the casting piston rod according to the invention makes it possible to drastically reduce the problems with regard to high kinetic energy to be converted and high pressure pulse occurring when using conventional casting piston rods made of steel or another non-light metal material.

Fig. 5 zeigt eine Variante der Gießkolbenstange der Fig. 1 bis 4, wobei für identische oder funktionell äquivalente Elemente gleiche Bezugszeichen verwendet sind und insoweit auf die obigen Erläuterungen zu den Fig. 1 bis 4 verwiesen werden kann, was die Funktionen und Vorteile der betreffenden Elemente angeht. Die Gießkolbenstange von Fig. 5 unterscheidet sich von derjenigen der Fig. 1 bis 4 darin, dass eine Antriebskolben-Kupplung als separates Bauteil 3' vorgesehen ist. Dieses separate Antriebskolben-Kupplungsstück 3' ist im gezeigten Beispiel nach Art einer becherförmigen Abschlusskappe mit Innengewinde gefertigt und auf das zugehörige Stirnende des insoweit gegenüber dem Beispiel der Fig. 1 bis 4 modifizierten Grundkörpers 1 aufgeschraubt, der zu diesem Zweck im betreffenden Stirnendbereich mit einem passenden Außengewinde anstelle der im Beispiel der Fig. 1 bis 4 angeformten Antriebskolben-Kupplung 3 versehen ist. Fig. 5 shows a variant of the casting piston rod of Fig. 1 to 4 , wherein identical reference numerals are used for identical or functionally equivalent elements and in this respect to the above explanations to the Fig. 1 to 4 reference to the functions and benefits of the elements concerned. The casting piston rod of Fig. 5 is different from the one of Fig. 1 to 4 in that a drive piston coupling is provided as a separate component 3 '. This separate drive piston coupling piece 3 'is made in the example shown in the manner of a cup-shaped end cap with internal thread and on the associated front end of the extent to the example of Fig. 1 to 4 unscrewed modified base body 1, for this purpose in the respective front end with a matching external thread instead of the example in the Fig. 1 to 4 molded drive piston coupling 3 is provided.

Durch Verwendung des separaten Antriebskolben-Kupplungsstück 3' kann die Antriebskolben-Kupplung materialmäßig vom Grundkörper 1 entkoppelt werden, d.h. für das Kupplungsstück 3' kann bei Bedarf ein anderes Material als das Leichtmetallmaterial des Grundkörpers 1 gewählt werden. In Betracht kommt z.B. die Fertigung des separaten Antriebskolben-Kupplungsstücks 3' aus einem Stahlmaterial. Damit kann in entsprechenden Anwendungsfällen eine optimierte Anpassung der immer noch weit überwiegend aus Leichtmetallmaterial bestehenden Gießkolbenstange an das Ankopplen eines üblichen Hydraulikkolbens einer Druckgießmaschine erreicht werden, ohne die mit der überwiegenden Verwendung von Leichtmetallmaterial für die Gießkolbenstange einhergehenden, oben erläuterten Vorteile zu beeinträchtigen. Außerdem kann auf diese Weise bei Bedarf die Antriebskolben-Kupplung 3' als separates Bauteil ohne den Grundkörper 1 z.B. im Wartungsfall ausgetauscht werden. Es versteht sich, dass statt der gezeigten Schraubbefestigung auch eine beliebige andere herkömmliche lösbare oder nicht lösbare Befestigungsart zum Anbringen der separaten Antriebskolben-Kupplung 3' am Grundkörper 1 vorgesehen sein kann, z.B. Aufschrumpfen. In bestimmten Fällen kann auch die Fertigung durch die zweiteilige Realisierung von zylindrischem Grundkörper und Antriebskolben-Kupplung erleichtert sein. Im Übrigen gelten für die Gießkolbenstange von Fig. 5 die oben zu derjenigen der Fig. 1 bis 4 erläuterten Vorteile in gleicher Weise.By using the separate drive piston coupling piece 3 ', the drive piston coupling material can be decoupled from the base body 1, ie, for the coupling piece 3' can be selected as needed, a different material than the light metal material of the base body 1. For example, the production of the separate drive piston coupling piece 3 'from a steel material comes into consideration. Thus, in appropriate applications, an optimized adaptation of the still predominantly made of light metal material casting piston rod to the coupling of a conventional hydraulic piston a Druckgießmaschine be achieved without affecting the advantages associated with the predominant use of light metal material for the casting piston rod, explained above. In addition, in this way, if necessary, the drive piston clutch 3 'as a separate component without the body 1, for example, be replaced during maintenance. It is understood that instead of the screw fastening shown any other conventional releasable or non-releasable attachment for attaching the separate drive piston coupling 3 'may be provided on the base body 1, eg shrinking. In certain cases, the production can be facilitated by the two-part realization of cylindrical body and drive piston coupling. Incidentally, apply to the casting piston rod of Fig. 5 the one above to the one of Fig. 1 to 4 explained advantages in the same way.

Bei einer als weitere Variante in Fig. 6 gezeigten Gießkolbenstange ist als einziger Unterschied zu derjenigen von Fig. 5 die Gießkolben-Kupplung als separates Bauteil 2' realisiert. Das separate Gießkolben-Kupplungsstück 2' ist an der zugewandten Stirnseite des insoweit modifizierten Grundkörpers 1 angebracht, wobei beispielhaft ein Aufschrumpfen eines ringförmigen Stirnendes des Kupplungsstücks 2' auf einen stirnseitigen Stumpf des Grundkörper 1 derart vorgesehen ist, dass sich ein glatter, fluchtender Übergang der Außenseite von Grundkörper 1 und Kupplungsstück 2' ergibt. Es versteht sich, dass alternativ auch hier eine beliebige andere herkömmliche Befestigungsart vorgesehen sein kann, um das Kupplungsstück 2' am betreffenden Stirnende des Grundkörpers 1 festzulegen, z.B. durch Aufschrauben.In one as another variant in Fig. 6 shown casting piston rod is the only difference to that of Fig. 5 the casting piston coupling realized as a separate component 2 '. The separate casting piston coupling piece 2 'is attached to the facing end side of the extent modified base body 1, wherein by way of example, a shrinking an annular end of the coupling piece 2' is provided on a frontal stump of the base body 1 such that there is a smooth, flush transition of the outside of body 1 and coupling piece 2 'results. It is understood that alternatively here also any other conventional fastening can be provided to determine the coupling piece 2 'at the relevant front end of the base body 1, for example by screwing.

Für das separate Gießkolben-Kupplungsstück 2' gelten die gleichen Vorteile wie für das separate Antriebskolben-Kupplungsstück 3', insbesondere hinsichtlich materialmäßiger Entkopplung vom Leichtmetallmaterial des Grundkörpers 1 und den sich daraus ergebenden Möglichkeiten einer optimalen Abstimmung auf die Bedürfnisse des anzukopplenden Bauteils, hier des Gießkolbens. Beispielsweise kann auch in diesem Fall eine Fertigung des Gießkolben-Kupplungsstücks 2' aus einem Stahlmaterial vorgesehen sein, was zu einem erhöhten Schutz des LeichtmetallGrundkörpers 1 z.B. vor Temperatureinflüssen und einem Angriff durch die Schmelze beitragen kann. Dennoch besteht auch im Beispiel von Fig. 6 die Gießkolbenstange durch den Leichtmetall-Grundkörper 1 weit überwiegend aus Leichtmetallmaterial, so dass die oben zum Ausführungsbeispiel der Fig. 1 bis 4 erläuterten Vorteile gegenüber herkömmlichen, überwiegend aus Nicht-Leichtmetallmaterial bestehenden Gießkolbenstangen in gleicher Weise auch auf die Gießkolbenstange von Fig. 6 zutreffen.For the separate casting piston coupling piece 2 'apply the same advantages as for the separate drive piston coupling piece 3', in particular with regard to material decoupling from the light metal material of the base body 1 and the resulting possibilities of a optimum matching to the needs of the component to be coupled, here the casting piston. For example, manufacture of the casting piston coupling piece 2 'from a steel material may also be provided in this case, which may contribute to increased protection of the light metal base body 1, for example from temperature influences and attack by the melt. Nevertheless, in the example of Fig. 6 the casting piston rod through the light metal base body 1 largely made of light metal material, so that the above for the embodiment of Fig. 1 to 4 explained advantages over conventional, consisting mainly of non-light metal material Gießkolbenstangen in the same way on the casting piston rod of Fig. 6 hold true.

Es versteht sich, dass in weiteren, nicht gezeigten Ausführungsformen der Erfindung die Gießkolbenstange auch gemischt aus Leichtmetallmaterial und Nicht-Leichtmetallmaterial aufgebaut sein kann, solange die Gießkolbenstange dadurch bezogen auf Volumen oder Gewicht immer noch überwiegend aus Leichtmetallmaterial besteht. Auch in solchen alternativen Ausführungsbeispielen ergeben sich durch die jedenfalls überwiegende Verwendung von Leichtmetallmaterial die oben erläuterten Vorteile hinsichtlich Reduzierung der umzuwandelnden kinetischen Energie und der Druckimpulsamplitude am Ende der Formfüllphase.It is understood that in other, not shown embodiments of the invention, the casting piston rod can also be mixed of light metal material and non-light metal material, as long as the casting piston rod is still based on volume or weight still predominantly made of light metal material. Even in such alternative embodiments, the predominant use of light metal material results in the advantages explained above with regard to reducing the kinetic energy to be converted and the pressure pulse amplitude at the end of the mold filling phase.

Claims (10)

  1. Use of a plunger bar with a base body (1) composed completely or predominantly of a light metal material, on which body a coupler (2) for coupling a casting plunger and/or a coupler (3) for coupling a drive piston is disposed, as a casting plunger bar for a casting machine, wherein the casting plunger coupler and/or the drive piston coupler are/is composed of a different material than the base body and are/is a separate component (2', 3') attached to the base body, and wherein the light metal material is a metal alloy including aluminium or magnesium as a main ingredient.
  2. Use according to claim 1, further characterized in that the base body (1) is cylindrical and has disposed on one cylinder end face the casting plunger coupler and disposed on the other cylinder end face the drive piston coupler.
  3. Use according to claim 2, further characterized in that the cylindrical base body has an axial cooling channel bore (4, 5).
  4. Use according to claim 3, further characterized in that the base body has a cooling channel inlet bore (6) and a cooling channel outlet bore (7), which open out from the circumference of the base body and are in communication with the cooling channel bore.
  5. Use according to claim 4, further characterized in that inserted into the cooling channel bore are a cooling tube (8), forming an annular gap (9), and an insert piece (10) adjoining the cooling tube, wherein the insert piece closes the annular gap and has a junction channel (11) for communication of the interior of the cooling tube with the cooling channel inlet bore.
  6. Casting machine having a casting plunger bar,
    characterized in that
    the casting plunger bar has a base body (1) composed completely or predominantly of a light metal material, on which body a coupler (2) for coupling a casting plunger and/or a coupler (3) for coupling a drive piston is disposed, wherein the casting plunger coupler and/or the drive piston coupler are/is composed of a different material than the base body and are/is a separate component (2', 3') attached to the base body, and wherein the light metal material is a metal alloy including aluminium or magnesium as a main ingredient.
  7. Casting machine according to claim 6, further characterized in that the base body (1) is cylindrical and has disposed on one cylinder end face the casting plunger coupler and disposed on the other cylinder end face the drive piston coupler.
  8. Casting machine according to claim 7, further characterized in that the cylindrical base body has an axial cooling channel bore (4, 5).
  9. Casting machine according to claim 8, further characterized in that the base body has a cooling channel inlet bore (6) and a cooling channel outlet bore (7), which open out from the circumference of the base body and are in communication with the cooling channel bore.
  10. Casting machine according to claim 9, further characterized in that inserted into the cooling channel bore are a cooling tube (8), forming an annular gap (9), and an insert piece (10) adjoining the cooling tube, wherein the insert piece closes the annular gap and has a junction channel (11) for communication of the interior of the cooling tube with the cooling channel inlet bore.
EP08020498.5A 2007-11-26 2008-11-26 Plunger bar for a casting machine Active EP2062667B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007058254A DE102007058254A1 (en) 2007-11-26 2007-11-26 Casting piston rod for a casting machine

Publications (3)

Publication Number Publication Date
EP2062667A2 EP2062667A2 (en) 2009-05-27
EP2062667A3 EP2062667A3 (en) 2009-06-17
EP2062667B1 true EP2062667B1 (en) 2016-04-06

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Application Number Title Priority Date Filing Date
EP08020498.5A Active EP2062667B1 (en) 2007-11-26 2008-11-26 Plunger bar for a casting machine

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DE (1) DE102007058254A1 (en)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1347780A (en) * 1962-11-19 1964-01-04 Philips Brasil Improvements to protection systems for fans or the like
CH417863A (en) 1964-05-13 1966-07-31 Buehler Ag Geb Die casting machine with hydraulic shot unit
DE1291864B (en) * 1966-03-25 1969-04-03 Fries Sohn J S Shooting device for die casting machines
JPS60250866A (en) * 1984-05-25 1985-12-11 Toshiba Mach Co Ltd Die casting machine
DE3734547A1 (en) * 1987-10-13 1989-05-03 Festo Kg PISTON CYLINDER AGGREGATE
DE29703444U1 (en) * 1997-02-26 1997-04-10 Festo Kg, 73734 Esslingen Piston rod for a linear drive
DE19838943C2 (en) * 1997-10-23 2000-10-12 Mannesmann Sachs Ag Attachment of an articulated part on a piston-cylinder unit
DE19901868B4 (en) 1999-01-19 2007-07-26 Wieland-Werke Ag Piston rod of a die casting machine
JP4272413B2 (en) * 2002-11-18 2009-06-03 株式会社ソディックプラステック Cold chamber die casting machine injection apparatus and weighing method thereof

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Publication number Publication date
EP2062667A2 (en) 2009-05-27
DE102007058254A1 (en) 2009-05-28
EP2062667A3 (en) 2009-06-17

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