EP2776189B1 - Dispositif, installation et procédé pour la coulée sous pression d'une matière métallique à l'état thixotropique - Google Patents

Dispositif, installation et procédé pour la coulée sous pression d'une matière métallique à l'état thixotropique Download PDF

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Publication number
EP2776189B1
EP2776189B1 EP12805558.9A EP12805558A EP2776189B1 EP 2776189 B1 EP2776189 B1 EP 2776189B1 EP 12805558 A EP12805558 A EP 12805558A EP 2776189 B1 EP2776189 B1 EP 2776189B1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
unit
screw
die
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.)
Not-in-force
Application number
EP12805558.9A
Other languages
German (de)
English (en)
Other versions
EP2776189B8 (fr
EP2776189A1 (fr
Inventor
Bernd Bültermann
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.)
Mold-Thix-Consulting Bueltermann GmbH
Original Assignee
Mold-Thix-Consulting Bueltermann GmbH
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Publication of EP2776189A1 publication Critical patent/EP2776189A1/fr
Application granted granted Critical
Publication of EP2776189B1 publication Critical patent/EP2776189B1/fr
Publication of EP2776189B8 publication Critical patent/EP2776189B8/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/007—Semi-solid pressure die casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/004—Thixotropic process, i.e. forging at semi-solid state
    • 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
    • B22D17/08—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled
    • 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
    • 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
    • B22D17/2023—Nozzles or shot sleeves
    • 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
    • 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
    • B22D17/2061—Means for forcing the molten metal into the die using screws
    • 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
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/2272—Sprue channels
    • B22D17/2281—Sprue channels closure devices therefor
    • 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
    • B22D17/30—Accessories for supplying molten metal, e.g. in rations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/32—Controlling equipment
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/12—Making non-ferrous alloys by processing in a semi-solid state, e.g. holding the alloy in the solid-liquid phase

Definitions

  • the present invention relates to an apparatus for die casting metallic material comprising a screw unit for placing the material in a thixotropic state and a cylinder / piston unit for pressurizing the thixotropic material for die casting.
  • the invention further relates to a system for die casting of metallic material in the thixotropic state, comprising such a device, as well as a method for die casting of metallic material in the thixotropic state using such a device.
  • die-casting parts can be improved with respect to molded in the conventional die casting process parts properties getting produced.
  • the materials must be brought to the transition temperature between the solid and the liquid phase, so that distributed crystallized components are embedded in contiguous molten areas ("thixotropic phase").
  • the additional action of shear forces reduces the crystalline structures of the solid components, decreases the viscosity of the material, facilitates its injection into the die and allows for precision die casting.
  • metal injection molding machines are made of EP 0 080 787 known.
  • metallic material is heated in the screw space of a combined cylinder / screw-piston unit and subjected to shear stress by rotation of the screw piston to put it in the thixotropic state.
  • the rotation of the screw piston conveys the material from the same time from the screw space in the front of the screw piston injection space of the cylinder / worm-piston unit, wherein the worm piston progressively recedes in the cylinder. If an amount of thixotropic material sufficient for pressure casting is in the injection space, the injection of the material into a casting mold is carried out by pressurizing the screw piston by means of a hydraulic system.
  • the tip of the screw piston is equipped with a non-return valve.
  • a non-return valve is subject to high loads due to the friction of the worm piston on the cylinder wall, the high process temperatures inside the cylinder and the pressurization. Due to its arrangement on the worm piston usually an uncontrolled valve is used, which leads to accuracy losses. Also, the required short injection times in conjunction with the large mass of the worm piston high demands on the hydraulics and their controls, due to the inertia in conjunction with the mass accelerations.
  • a metal injection molding machine which achieves a much smaller piston mass by separation of screw unit and cylinder / piston unit.
  • the material is initially placed in a screw unit (screw extruder) in the thixotropic state and thus fed to a separate cylinder / piston unit, which performs the injection process.
  • the screw unit conveys the thixotropic material via a hot runner into a feed space behind the piston in the cylinder.
  • the piston initially moves back, the material passes through a check valve in the piston from the feed space into the injection space on the other side of the piston, and by the pressurization of the piston, it is injected into the die.
  • the valve located in the piston is exposed to high loads;
  • the piston moving during the injection process with a closed check valve causes undesired, uncontrollable suction in the screw extruder via the hot runner.
  • the US 2002/0053416 shows as an alternative a direct feed from the screw unit via the hot runner into the injection space of the cylinder / piston unit.
  • the high injection pressure of the cylinder / piston unit acts directly back into the screw unit via the hot runner.
  • the screw unit and its entire mechanics and hydraulics are repeatedly subjected to high pressure surges, which increases not only the direct load but also the wear.
  • the WO 01/021343 describes a method for placing a liquid metal alloy in the thixotropic state in a twin-screw extruder and for subsequent injection molding by means of a cylinder / piston unit.
  • the twin screw is intended by very high speed to curb application and hardening of the melt on the cooled wall of the extruder, and a controllable mechanical valve on the extruder to prevent premature flow of the melt into the cylinder / piston unit.
  • Such a valve with moving parts is highly stressed and prone to failure because of the constant temperature fluctuations and the mechanical loads.
  • the invention has for its object to provide a device for die casting of metallic material in the thixotropic state, which overcomes the aforementioned disadvantages of the prior art.
  • a thermally controllable valve is arranged between the screw unit and the injection space of the cylinder / piston unit.
  • a thermally controllable valve is arranged between the screw unit and the injection space of the cylinder / piston unit.
  • Such a valve which lies between the screw unit and the injection space of the cylinder / piston unit, makes it possible to release the flow of material from the screw unit when loading the cylinder / piston unit on the one hand and on the other hand, a return flow of material from the cylinder / piston unit in to prevent the screw unit from pressurizing for die casting.
  • the material for the injection process is precisely metered, and the screw unit is reliably preserved from the high pressure in the cylinder of the cylinder / piston unit at the moment of injection.
  • non-material-filled cylinder space can be filled with gas, in particular with inert gas, which prevents oxidation of the material and reduces the force required for the die-cast hydraulic system. Since the valve is not arranged on the piston of the cylinder / piston unit, it is much less stressed and subject to only minor structural restrictions.
  • controllable valve is formed by a connecting channel, which is equipped with controllable means for forced cooling of the material therein to below its solidification temperature.
  • controllable means for forced cooling of the material therein to below its solidification temperature.
  • the connecting channel is widened in the direction of the cylinder / piston unit.
  • Such an extension may be conical or stepped.
  • the material solidified in the connecting channel forms a positive plug there, which reliably prevents the high injection pressures of the cylinder / piston unit from the screw unit.
  • this is particularly preferably equipped with controllable means for heating the material therein.
  • the cylinder / piston assembly can be charged with thixotropic material for further die casting from the screw unit.
  • the screw unit and the cylinder / piston unit form a gap between each other, which - apart from any thermal insulators - is bridged only by the valve.
  • This allows thermal decoupling of screw unit and cylinder / piston unit and thus allows independent temperature control in the screw unit and the cylinder / piston unit.
  • the accessibility to the valve is facilitated, which is preferably at its two ends in each case releasably secured to the screw unit on the one hand and on the cylinder / piston unit on the other hand.
  • the releasability of the attachment allows replacement of the valve independently of the screw unit and cylinder / piston unit.
  • the valve is, as described, preferably a connection channel with forced cooling means, but could also be designed as a conventional valve with a mechanically closable connection channel between the screw unit and cylinder / piston unit.
  • the valve is formed in a pipe piece which engages with end flanges in connection openings of the screw unit on the one hand and the cylinder / piston unit on the other hand.
  • the pipe section is fixed with threaded rings in the connection openings, which threaded rings engage with external threads in the internal thread of the connection openings and are divided in the axial direction.
  • Such a flange connection ensures a secure, pressure-tight fit of the valve in the screw unit on the one hand and the cylinder / piston unit on the other hand.
  • a release of the seat by only one threaded ring on each flange is possible quickly. Due to the preferred division of the threaded rings in the axial direction, moreover, the valve can first be inserted into the respective connection opening and subsequently the respective threaded ring can be fitted and fixed comprehensively piece by piece.
  • the threaded rings are not fixed components of the valve or the pipe section and thus independent of the valve and reusable.
  • the mouth of the connecting channel lying in the connection opening of the cylinder / piston unit can be closed by a blocking slide carried by the piston. If the mouth of the connecting channel is closed by the gate valve, so when cooling and solidification of the material in the device no connection between the solidified in the connecting channel of the valve and located in the cylinder / piston unit material, whereby the pipe section of the cylinder / piston Unit, eg for a replacement of the valve, without high force and without the risk of damaging the mouth of the connecting channel and / or the cylinder / piston unit can be lifted.
  • the gate valve can be carried by the piston in a separate guide - inside or outside the cylinder.
  • the locking slide protrudes in the stroke direction of the piston from the effective piston surface. In this way, the gate valve forms a unit with the piston carrying it and requires no additional components, seals or guides.
  • the worm of the worm unit is axially displaceable and has a sealing cone for sealing against a conical annular shoulder on the inner circumference of the worm unit at its end facing the valve.
  • a sealing cone for sealing against a conical annular shoulder on the inner circumference of the worm unit at its end facing the valve.
  • the sealing cone carries at its tip a plunger, which is insertable into the connecting channel.
  • a plunger not only increases the distance between solidifying material in the connecting channel and thixotropic material in the screw unit, but facilitates the low-force extraction of the valve from the screw unit, for example in a similar manner as the gate valve on the cylinder / piston unit side of the connecting channel its exchange.
  • the screw unit can optionally have a bayonet lock for locking the screw in its sealing position.
  • the entire device can be performed with screw unit, valve and cylinder / piston unit in any mounting position. It is particularly advantageous if the cylinder / piston unit is approximately horizontal and the screw unit is arranged approximately vertically: Such an arrangement is particularly space-saving and thereby facilitates the retrofitting of a conventional die-casting system with die-cast hydraulic and die casting or an existing metal injection molding system with the device according to the present invention. Moreover, the screw unit, valve and cylinder / piston unit are easily accessible in this position and the cleaning or emptying of the screw unit can be assisted by gravity, by heating the interior of the screw unit above the melting point of the material, so that this with the valve open in the injection space ( eg for repeated injection) drains off. About that In addition, the screw unit can be fed so easily on its top under gravity.
  • At least one stirring element is arranged on the effective piston surface of the piston and the piston is additionally rotatably drivable.
  • the thixotropic material located in the injection space can be kept in motion, which also favors its homogeneous tempering and creates an additional possibility for influencing the properties of the thixotropic material by the choice of the rotational speed.
  • the stirring elements may for example be designed as inclined to the axis of the piston knobs. Also, said gate valve can take over the function of such a stirring element.
  • the rotary drive of the piston is equipped with means for measuring the torque. From the measured torque can be closed in particular on the viscosity and thus on the state of the thixotropic material located in the injection space and so the process further automated and regulated and monitored with regard to process safety.
  • the screw can be provided with an internal heating.
  • an internal heating In this way, a rapid, precise heating of the metallic material in its displacement in the thixotropic state within the screw unit is possible, thereby shortening the necessary length of the entire screw unit.
  • the inner heating comprises at least one heating coil, which is wound around axially slotted bimetallic pipe sections. As a result, the heating coil contracts in the cold state and can be easily inserted into the screw for mounting and replacement, whereas it expands when hot and is thus pressed in close heat-conducting contact to the inside of the screw.
  • the screw has at least one internal temperature sensor, via which additional, precise information about the processes inside the screw unit can be obtained to control the device.
  • At least two feed ducts distributed over the circumference of the screw are provided for feeding the screw unit with metallic material. This ensures that the worm is filled uniformly around the circumference. This avoids “bridging" within the screw barrel where the screw encounters different frictional factors due to uneven filling in different zones along its circumference, which would affect the uniformity of the thixotropic material.
  • the screw unit can be designed with at least two counter-rotating, gear-like intermeshing screws.
  • Such an embodiment increases the shear forces which act on the filled metallic material by the screw rotation.
  • the thixotropic state of the material becomes more uniform.
  • the piston of the cylinder / piston unit is preferably equipped with at least one piston ring.
  • Piston rings also facilitate lubrication of the piston in its process in the cylinder without the risk of contamination of the thixotropic material in the injection space by lubricant.
  • At least one temperature sensor is arranged in the piston of the cylinder / piston unit.
  • a temperature sensor arranged in this way permits a continuous temperature detection, unlike a temperature sensor usually integrated into the cylinder wall according to the prior art:
  • a wall-integrated sensor only supplies temperature data on the thixotropic material in the injection space during injection until it is swept by the piston during the injection process ,
  • a wall-integrated sensor is exposed to high friction stresses when it is painted over; all these Disadvantages does not have a directly arranged in the piston temperature sensor.
  • the piston of the cylinder / piston unit may optionally be arranged at least one pressure sensor, which - comparable to the integrated in the piston temperature sensor - allows continuous detection of the pressure in the injection chamber.
  • the screw unit and / or cylinder / piston unit are equipped with means for forced cooling.
  • the device and the material contained therein e.g. be quickly cooled down during maintenance downtime or for module replacement, which shortens downtime.
  • the invention also provides a system for die casting metallic material in the thixotropic state, comprising the described apparatus, a die-cast hydraulic system for pressurizing the piston of the cylinder / piston unit, and a die-fed die casting die for pressure casting of the cylinder / piston unit metallic material in the thixotropic state.
  • a system for die casting metallic material in the thixotropic state comprising the described apparatus, a die-cast hydraulic system for pressurizing the piston of the cylinder / piston unit, and a die-fed die casting die for pressure casting of the cylinder / piston unit metallic material in the thixotropic state.
  • a preferred embodiment of the method of the invention is characterized by the further step of heating the connection channel until regaining the fluidity of the material therein to prepare for a new implementation of the method.
  • the present method can be converted into a highly productive cyclic process with rapid timing.
  • the solidification of the material preferably takes place by forced cooling of the connection channel.
  • the solidification can also be done by switching off a heater of the connection channel.
  • the thixotropic material in the cylinder / piston unit is stirred before and / or during the injection process. As shown, so the thixotropic material contained in the injection chamber in the cylinder / piston unit can be kept in a uniform state and its properties are also selectively changed.
  • a metal injection molding machine 1 has a device 2 for die casting metallic materials in the thixotropic state into a die casting mold 3, a die casting hydraulic system 4 for pressurizing the device 2 and an electronic control (not shown) for process control of the entire system 1.
  • the system 1 can also be built on the basis of a conventional die-casting system, which by installing the device 2 between (conventional) die-cast hydraulic 4 and (conventional) die-casting mold 3 specifically is retrofitted for metal injection molding, optionally also subsequently, in which case the device 2 forms a retrofit or adapter set.
  • the device 2 comprises an approximately vertical screw unit 5, a valve 6 and an approximately horizontally arranged cylinder / piston unit 7 of piston 7 'and cylinder 7 ".
  • metallic material (not shown) is placed in the thixotropic state and thus the cylinder / piston unit 7 is charged via the valve 6.
  • the die-casting hydraulic system 4 then acts on the piston 7 'of the cylinder / piston unit 7 in order to inject the thixotropic material from the cylinder / piston unit 7 into the pressure casting mold 3.
  • the device 2 is seated in an adjusting device 9 on a holding cup 10 and this on the bearing rails 8.
  • the adjusting device 9 is used to adapt the mounting position of the device 2 to the die-casting mold 3 and the die-cast hydraulic 4 in height and angle; Adjusting device 9 and / or holding cup 10 may be omitted if necessary.
  • Both the screw unit 5 and the cylinder / piston unit 7 have carrying eyelets 11.
  • the carrying eyelets 11 are used to manipulate the device 2 as a whole - for example, when replacing the device 2 against any other die-casting device or for maintenance purposes - or Lifting the screw unit 5 of the cylinder / piston unit 7, for example, to exchange the valve. 6
  • the die-cast hydraulic system 4 actuates the piston 7 'of the cylinder / piston unit 7 via a piston rod 13 and thixotropic material is guided from the cylinder / piston unit 7 via a spray nozzle 14 to the die casting mold 3, as explained in more detail below.
  • the die-casting mold 3 is generally designed in at least two parts and is held by a clamping frame 15 with centering bolts 16. For removing a finished die-cast molding after its solidification in the die casting mold 3 clamping frame 15 and die 3 are opened in a manner known to those skilled in their division.
  • An optional stirring drive 17 drives via a gear 18, the piston rod 13 and thus the piston 7 'of the cylinder / piston unit 7 for rotation about its axis.
  • at least one gear wheel of the transmission 18 may be provided with over-width teeth to compensate for the axial movements of the piston 7 'during die casting.
  • the transmission 18 may be another known in the art drive, such as a belt drive, but also a - possibly hydraulic - direct drive occur.
  • a - also optional - maintenance hydraulic 19 is used to independent of the hydraulic 4 process of the piston 7 'in a maintenance position 20 ( Fig. 3 ), as explained in detail below, if this function is not perceived by the die-cast hydraulic system 4 itself.
  • Fig. 2 shows the screw unit 5 in detail.
  • the screw unit 5 places metallic material in a thixotropic state in preparation for the subsequent die casting.
  • the feed channels 21 extend through the wall of the screw cylinder 22 inclined downwards, preferably at an angle between about 45 ° and about 60 °, which simplifies the uniform feed.
  • the screw unit 5 - and thus the entire system 1 - if necessary, with inert gas or other gaseous, liquid and / or solid material to be charged.
  • This may be material that enhances metal injection molding from a process perspective, such as grain refinement or fire retardancy, or material that affects the properties of the future die casting, such as alloying or fiber insertion.
  • Inert gas for fire retardancy seeps in the face of its high mass following gravity into the screw unit 5 and the plant 1, displacing, for example, therein oxidizing oxygen.
  • a worm drive 23 drives a screw 24 rotatably mounted in an axially displaceable manner in the worm cylinder 22 and exerts on the material the shearing forces required to displace the material into the thixotropic state.
  • the material in the screw unit 5 is heated by means of a controllable worm heater 25, which comprises the worm cylinder 22 and is preferably divided in at least two segments S ', S "in the direction of the axis of the worm cylinder 22.
  • the segments S', S" can By targeted control different temperature zones in the screw cylinder 22 produce.
  • the device 2 can be designed so that the screw unit 5 via the valve 6, the cylinder / piston unit 7 similar to a conventional extruder continuously charged with thixotropic material.
  • the thixotropic material in the screw unit 5 is preliminarily collected in the lower portion of the screw cylinder 22 by continuously moving the screw 24 in the screw cylinder 22 upwards and spilling thixotropic material into the lower portion of the screw cylinder 22. This movement can be actively supported by a worm hydraulic 26. If, in this case, the intended amount of thixotropic material is prepared in the screw cylinder 22, then this is conveyed by the screw 24 acted upon by the screw hydraulics via the valve 6 into the cylinder / piston unit 7.
  • the screw 24 may have at its lower, the valve 6 end facing a sealing cone 27 for sealing against a conical annular shoulder 28 on the inner circumference of the worm cylinder 22.
  • the screw 24 (not shown) in its sealing system on the conical annular shoulder 28 and locked in this sealing position by an optional bayonet lock 29.
  • an optional bayonet lock 29 As a result, a sealing of the screw unit 5 relative to the valve 6 without further expenditure of energy can be achieved.
  • the bayonet closure 29 another type of locking known in the prior art can also be used.
  • a cylindrical plunger 30 projecting from the tip of the sealing cone 27 can enter into the sealing position of the screw 24 in the mouth of a central connecting channel 31 of the valve 6.
  • the plunger 30 simplifies the replacement of the valve 6 by spacing the optionally solidified material contained therein from the screw unit 5. Thus, a valve change in the cold state without risk of damage to the screw unit 5 and valve 6 is possible.
  • the plunger 30 may alternatively have a shape adapted to the valve 6 or optionally omitted. Also, the conical annular shoulder 28 could be executed directly in the mouth of the central connection channel 31 of the valve 6.
  • the worm 24 can be equipped with a - for example also segmented - internal heating (not shown). If such an internal heating is designed as an electric heater, then it may preferably be constructed with heating coils which are wound around axially slotted bimetal pipe pieces which are designed so that they can be displaced in the cold state in the screw 24 and when hot firmly against the inner wall of the screw 24.
  • the screw 24 has one or more distributed internal temperature sensors (not shown).
  • the signal transmission can be wireless eg via radio or via slip rings (not shown) take place on the screw 24.
  • the screw unit 5 can also be designed with at least two counter-rotating, gear-like intermeshing screws 24.
  • Fig. 3 shows the valve 6 in detail.
  • the valve 6 is fixed with an upper flange 32 in a connection opening 33 of the screw unit 5 and with a lower flange 34 in a connection opening 35 of the cylinder / piston unit 7.
  • the valve 6 provides communication for the thixotropic material prepared in the screw unit 5 to feed the cylinder / piston unit 7 and prevents backflow of the material from the cylinder / piston unit 7 into the screw unit 5 during injection.
  • the valve 6 serves in particular to prevent the high pressure, which arises during the injection movement of the piston 7 'in the cylinder / piston unit 7, from the screw unit 5.
  • the valve 6 is according to Fig. 3 as a pipe section 36 with central controllable connection channel 31 for selectively connecting the interior of the screw cylinder 22 with the serving as injection chamber 37 interior of the cylinder 7 "of the cylinder / piston unit 7 executed.
  • valve 6 operates thermally and has a heating and / or coolable connection channel 31, which passes through the pipe section 36 and is optionally extended to the cylinder / piston unit 7 out.
  • the connecting channel 31 is shown stepped or stepped expanded, but it may alternatively be conical (see Fig. 2 ), staircase-conical, bulbous-conical, bulbous or simply cylindrical; Also, various of these shapes may be strung together in the axial direction.
  • the heater 39 For thermal loading of the connecting channel 31 and thus control of the valve 6, this is a controllable Heater 39 and / or controllable forced cooling means 40 equipped.
  • material located in the connecting channel 31 can be kept in the thixotropic state, and any solidified material present in it can be rendered flowable again in order to "unlock" the valve 6.
  • the heater 39 may be divided into segments for zone-wise temperature control.
  • connection channel 31 By allowing the connection channel 31 to cool, the material therein may be allowed to solidify and then form a solid plug in the connection channel 31 which inhibits material passage through the connection channel 31 and thus "locks" the valve 6.
  • the solidification of the material in the connecting channel 31 can be done by switching off the heater 39 and / or by switching on the forced coolant 40.
  • the forced cooling means 40 may comprise, for example, gaseous coolant in cooling channels 40 in the pipe section 36.
  • the heater 39 can preferably be designed as inductive pulse heating and the forced cooling means 40 as CO 2 gas cooling.
  • the forced cooling means 40 as CO 2 gas cooling.
  • other known from the prior art heaters and / or cooling for the valve 6 can be used.
  • the heater 39 and / or the forced coolant 40 may, as in Fig. 3 represented, in or on the wall of the pipe section 36 or in one or more the wall of the pipe section 36 and the connecting channel 31 approximately transversely interspersed insert cartridge (s) may be arranged.
  • connection openings 33, 35 engage threaded rings 43 with external threads in internal thread of the connection openings 33, 35 a.
  • the threaded rings 43 are preferably divided in their axial direction, whereby they can be handled independently of the valve 6 and even after its insertion into the connection openings 33, 35 wrapped around the pipe section 36 and into the internal thread of the respective connection opening 33, 35 can be rotated.
  • the threaded rings 43 can optionally have corresponding recesses on their exposed engagement surfaces 44. Buffers (not shown) in the dividing slots of the threaded rings 43 prevent them from slipping and wedging by filling the kerf formed in the manufacture of the threaded rings from a one-piece ring and subsequent sawing.
  • conventional flange fasteners e.g. by means of screwing through holes in the flanges (not shown), for fixing the valve 6 in the connection openings 33, 35 are used.
  • the mouth 45 of the connecting channel 31 opens directly or as shown via an auxiliary channel 48 in the wall of the cylinder 7 "of the cylinder / piston unit 7 between the piston 7 'and spray nozzle 14 in the injection chamber 37 of the cylinder 7".
  • a gate valve 46 which protrudes from the effective piston surface 47 of the piston 7 'closes the mouth 45 of the valve 6 upon movement of the piston 7' in the maintenance position 20 by entering the auxiliary channel 48 and lies in front of the mouth 45.
  • the cross section of the locking slide 46 may be, for example, round, oval, polygonal or one or lenticular but also asymmetrical and, for example, have concave segments.
  • the locking slide 46 can alternatively be carried along by a linkage from the piston 7 'and also be guided outside the cylinder 7 "or in a separate guide (not shown) approximately in the wall of the cylinder 7".
  • the piston movement in the maintenance position 20 performs the maintenance hydraulic 19 mostly for maintenance purposes, for example, for the replacement of the valve 6; in the operational injection process, the piston 7 'generally does not move until the mouth 45 is closed by the blocking slide 46.
  • the auxiliary channel 48 is parallel to the stroke direction 49 of the piston 7 'and has a cross section adapted to the cross section of the locking slide 46.
  • the auxiliary channel 48 may also have a different cross section relative to the locking slide 46, as long as the locking slide 46 is able to seal the mouth 45 of the valve 6 with respect to the injection space 37.
  • the auxiliary channel 48 is open on both sides to the injection chamber 37.
  • the piston 7 When loading the cylinder / piston unit 7 with thixotropic material from the screw unit 5 via the valve 6 in the injection chamber 37, the piston 7 'either back by the pressure of the screw unit 5, or he is actively withdrawn by the die-cast hydraulic 4, wherein he can also assist the screw unit 5 by its suction effect during loading.
  • the thixotropic material is thus collected in the injection chamber 37 for the following injection.
  • the cylinder / piston unit has a cylinder heater 51.
  • the cylinder heater 51 like the screw heater 25, is optionally segmented and controllable by zone. Also for cleaning and emptying of the screw unit 5, the valve 6 or the cylinder / piston unit 7, screw heater 25, heater 39 or cylinder heater 51 can liquefy the respective material contained therein.
  • screw unit 5 or cylinder / piston unit 7 can be equipped with forced cooling means, for example in the manner of the forced cooling means 40 of the valve 6, for rapid cooling for maintenance and module exchange purposes.
  • stirring elements 52 On the effective piston surface 47 of the piston 7 ', in addition to the locking slide 46, one or more stirring elements 52 be arranged.
  • the stirring elements 52 are for example inclined to the axis of the piston nubs, but may also be shovel or annular or another for stirring the located in the injection chamber 37 thixotropic material have suitable shape, or even be formed by the gate valve 46 itself.
  • FIG. 3 Further information about the state of the thixotropic material located in the injection chamber 37 can be provided by temperature and pressure sensors in the injection chamber 37.
  • Fig. 3 are at least one temperature sensor 53 and / or at least one pressure sensor 54 in the piston 7 '.
  • the signals 55 of the sensors 53, 54 are transmitted, for example, by the piston rod 13 and possibly as described above via slip rings or radio to an external signal evaluation unit (not shown).
  • the valve 6 is closed by switching off the heater 39 and / or switching on the forced coolant 40, which prepares the device 2 for injecting the material into the die casting mold 3 .
  • the die-cast hydraulic system 4 pressurizes the piston 7 'via the piston rod 13, whereby the thixotropic material is injected from the injection chamber 37 through the spray nozzle 14 into the die-casting mold 3, where it solidifies and can later be removed as a molded part.
  • the piston 7 ' can be provided with one or more piston rings with respect to the inner wall of the cylinder 7 "for better sealing of the injection space 37.
  • the piston rings can, for example, be designed as compression rings in a manner known per se be whose pressure to the inner wall of the cylinder 7 "is accomplished mainly by the pressure of the thixotropic material in the injection chamber 37, for example via suitable shaping of the compression rings or by additional pressure channels in the piston 7 'between the injection chamber 37 and compression rings Inner wall of the cylinder 7 "possible;
  • lubricants could be supplied, for example, through lubricant bores in the wall of the cylinder 7 "or over that space in the cylinder 7" which lies on the side of the piston 7 'facing away from the die-casting mold 3.
  • the spray nozzle 14, which opens into the die casting mold 3, preferably has a nozzle heater 56.
  • the spray nozzle 14 can be designed thanks to this as a so-called. Hot runner to prevent solidification of the material in its interior.
  • Fig. 3 shows an optional insulating jacket 57 for thermal insulation around the spray nozzle 14. Such insulating jacket 57 can be used in a suitable size for the thermal insulation of the screw unit 5, the valve 6 and / or the cylinder / piston unit 7.
  • the mouth 45 of the valve 6 also opens on the side of the piston 7 'facing away from the die 3 into a feed space (not shown) of the cylinder 7.
  • the screw unit 5 feeds this feed space via the valve 6 instead of the injection space 37. If the piston 7 'then retracts and allows thixotropic material to pass through a check valve from the feed space into the injection space 37, the valve 6 can protect the screw unit 5 against pressure and / or suction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Claims (21)

  1. Dispositif (2) pour la coulée sous pression d'un matériau métallique, avec une unité de vis sans fin (5) pour transposer le matériau dans un état thixotrope et une unité cylindre-piston (7) alimenté par l'unité de vis sans fin (5) pour la mise sous pression du matériau thixotrope en vue de la coulée sous pression, caractérisé en ce qu'une soupape à commande thermique (6) est disposée entre l'unité de vis sans fin (5) et l'unité cylindre-piston (7).
  2. Dispositif selon la revendication 1, caractérisé en ce que la soupape à commande (6) est formée par un canal de liaison (31), lequel est équipé avec des moyens réglables (40) pour un refroidissement forcé du matériau y étant contenu jusqu'à sa température de solidification.
  3. Dispositif selon la revendication 2, caractérisé en ce que le canal de liaison (31) est élargi en direction de l'unité cylindre-piston (7).
  4. Dispositif selon la revendication 2 ou 3, caractérisé en ce que le canal de liaison (31) est équipé de moyens réglables (39) pour le chauffage du matériau y étant contenu.
  5. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que l'unité de vis sans fin (5) et l'unité cylindre-piston (7) forment entre elles une fente (41) qui est surmontée uniquement par la soupape (6), en dehors des isolants thermiques (42).
  6. Dispositif selon l'une des revendications 1 à 5, caractérisé en ce que l'embouchure (45) du canal de liaison (31) située dans une ouverture de raccordement (35) de l'unité cylindre-piston (7) peut être fermée par un coulisseau de verrouillage (46) entraîné par le piston (7') de l'unité cylindre-piston (7).
  7. Dispositif selon la revendication 6, caractérisé en ce que le coulisseau de verrouillage (46) dépasse de la surface active de piston (47) du piston (7') dans la direction de soulèvement (49) de celui-ci.
  8. Dispositif selon l'une des revendications 1 à 7, caractérisé en ce que la vis sans fin (24) de l'unité de vis sans fin (5) peut être déplacée axialement et dispose d'un cône d'étanchéité (27) sur son côté orienté vers la soupape (6) pour assurer l'étanchéité vis-à-vis d'un épaulement annulaire (28) conique au pourtour interne de l'unité de vis sans fin (5).
  9. Dispositif selon la revendication 8 en liaison avec la revendication 2, caractérisé en ce que le cône d'étanchéité (27) porte un poussoir (30) à son sommet, lequel peut être inséré dans le canal de liaison (31).
  10. Dispositif selon l'une des revendications 1 à 9, caractérisé en ce que l'unité cylindre-piston (7) est disposée à peu près horizontalement et l'unité de vis sans fin (5) à peu près verticalement.
  11. Dispositif selon l'une des revendications 1 à 10, caractérisé en ce qu'au moins un élément d'agitation (52) est disposé sur la surface active de piston (47) du piston (7') et que le piston (7') peut être entraîné en outre en rotation.
  12. Dispositif selon la revendication 11, caractérisé en ce que l'entraînement en rotation (17) du piston (7') est équipé de moyens pour la mesure du couple de rotation.
  13. Dispositif selon l'une des revendications 1 à 12, caractérisé en ce que la vis sans fin (24) est pourvue d'un chauffage interne.
  14. Dispositif selon la revendication 13, caractérisé en ce que le chauffage interne comprend au moins une hélice de chauffage, laquelle est enroulée axialement autour de morceaux de tuyau bimétalliques fendus.
  15. Dispositif selon l'une des revendications 1 à 14, caractérisé en ce qu'au moins un capteur de température (53) est disposé dans le piston (7') de l'unité cylindre-piston (7).
  16. Installation pour la coulée sous pression d'un matériau métallique à l'état thixotropique, comprenant le dispositif (2) selon l'une des revendications 1 à 15, un système hydraulique de coulée sous pression (4) pour la mise sous pression du piston (7') de l'unité cylindre-piston (7) et un moule de coulée sous pression (3) alimenté par l'unité cylindre-piston (7) pour la coulée sous pression d'un matériau métallique à l'état thixotrope.
  17. Procédé pour la coulée sous pression d'un matériau métallique à l'état thixotrope, comprenant les étapes :
    de transposition d'un matériau métallique à l'état thixotrope dans une unité de vis sans fin (5),
    de transport du matériau thixotrope de l'unité de vis sans fin (5) dans une unité cylindre-piston (7) par l'intermédiaire d'un canal de liaison (31),
    de solidification du matériau se trouvant dans le canal de liaison (31),
    d'injection du matériau thixotrope à partir de l'unité cylindre-piston (7) dans un moule de coulée sous pression (3) pendant que le canal de liaison (31) est bloqué par le matériau y étant solidifié.
  18. Procédé selon la revendication 17, caractérisé par l'étape supplémentaire du chauffage du canal de liaison (31) jusqu'à ce que le matériau s'y trouvant ait retrouvé sa capacité d'écoulement pour la préparation d'un nouveau cycle du procédé.
  19. Procédé selon la revendication 17 ou 18, caractérisé en ce que la solidification est réalisé par un refroidissement forcé (40) du canal de liaison (31).
  20. Procédé selon la revendication 17 ou 18, caractérisé en ce que la solidification est réalisé par la coupure d'un chauffage (39) du canal de liaison.
  21. Procédé selon l'une des revendications 17 à 20, caractérisé en ce que le matériau thixotrope dans l'unité cylindre-piston (7) est agité avant et/ou pendant le processus d'injection.
EP12805558.9A 2011-11-10 2012-11-02 Dispositif, installation et procédé pour la coulée sous pression d'une matière métallique à l'état thixotropique Not-in-force EP2776189B8 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA1664/2011A AT512229B1 (de) 2011-11-10 2011-11-10 Vorrichtung, anlage und verfahren zum druckgiessen von metallischem material im thixotropen zustand
PCT/AT2012/050172 WO2013067567A1 (fr) 2011-11-10 2012-11-02 Dispositif, installation et procédé pour la coulée sous pression d'une matière métallique à l'état thixotropique

Publications (3)

Publication Number Publication Date
EP2776189A1 EP2776189A1 (fr) 2014-09-17
EP2776189B1 true EP2776189B1 (fr) 2015-09-09
EP2776189B8 EP2776189B8 (fr) 2015-11-04

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EP12805558.9A Not-in-force EP2776189B8 (fr) 2011-11-10 2012-11-02 Dispositif, installation et procédé pour la coulée sous pression d'une matière métallique à l'état thixotropique

Country Status (6)

Country Link
US (2) US9339867B2 (fr)
EP (1) EP2776189B8 (fr)
AT (1) AT512229B1 (fr)
ES (1) ES2553833T3 (fr)
PT (1) PT2776189E (fr)
WO (1) WO2013067567A1 (fr)

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CN103624236B (zh) * 2013-09-16 2017-02-08 华南理工大学 一种挤压铸造定量浇注装置及方法
AT515970B1 (de) * 2014-07-03 2018-11-15 Ltc Gmbh Verfahren und Vorrichtung zum Gießen zumindest eines Bauteils
CN104741592B (zh) * 2015-03-19 2020-02-11 新荣株式会社 铝质汽车部件制造用连续铸锻造装置及利用其的制造方法
AT518824A1 (de) * 2016-05-31 2018-01-15 Lkr Leichtmetallkompetenzzentrum Ranshofen Gmbh Verfahren zur Herstellung eines Profils aus einer Metalllegierung
AT518822A1 (de) * 2016-05-31 2018-01-15 Lkr Leichtmetallkompetenzzentrum Ranshofen Gmbh Verfahren und Extruder zur Herstellung eines Profils aus einer Metalllegierung
CN108067600A (zh) * 2016-11-17 2018-05-25 机械科学研究总院（将乐）半固态技术研究所有限公司 一种高效低成本制造半固态Al-Si系铝合金铸件的流变成形方法
DE102017114012A1 (de) * 2017-06-23 2018-12-27 Norsk Hydro Asa Verfahren und Vorrichtung zur Herstellung von stückigem Aufgabegut aus Metall
AT521217B1 (de) * 2018-05-11 2021-02-15 Thixotropic Piston Injection Tech Gmbh Modul für eine Druckgussvorrichtung
AT523548A1 (de) * 2020-02-18 2021-09-15 Thixotropic Piston Injectiontechnology Gmbh Verfahren zur Herstellung eines metallischen Bauteiles und Vorrichtung hierzu
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Also Published As

Publication number Publication date
ES2553833T3 (es) 2015-12-14
US9802246B2 (en) 2017-10-31
WO2013067567A1 (fr) 2013-05-16
US20140311698A1 (en) 2014-10-23
AT512229A1 (de) 2013-06-15
EP2776189B8 (fr) 2015-11-04
EP2776189A1 (fr) 2014-09-17
PT2776189E (pt) 2015-12-04
US9339867B2 (en) 2016-05-17
US20160221074A1 (en) 2016-08-04
AT512229B1 (de) 2014-10-15

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