EP2460605B1 - Procédé de fabrication d'une série de composants en fonte et dispositif de fabrication d'un composant en fonte - Google Patents

Procédé de fabrication d'une série de composants en fonte et dispositif de fabrication d'un composant en fonte Download PDF

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Publication number
EP2460605B1
EP2460605B1 EP11007794.8A EP11007794A EP2460605B1 EP 2460605 B1 EP2460605 B1 EP 2460605B1 EP 11007794 A EP11007794 A EP 11007794A EP 2460605 B1 EP2460605 B1 EP 2460605B1
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EP
European Patent Office
Prior art keywords
temperature
pressure
producing
light metal
casting mould
Prior art date
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Active
Application number
EP11007794.8A
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German (de)
English (en)
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EP2460605A1 (fr
Inventor
Andreas Kempf
Timo Retter
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.)
Volkswagen AG
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Volkswagen AG
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Filing date
Publication date
Application filed by Volkswagen AG filed Critical Volkswagen AG
Publication of EP2460605A1 publication Critical patent/EP2460605A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • 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
    • 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

Definitions

  • the invention relates to a method for producing a series of cast components according to the preamble of claim 1 and to an apparatus for producing a cast component according to the preamble of claim 7.
  • the molten metal is supplied to at least two heated melt feeds and passes from there into the mold, wherein the mold has a channel in which melt streams opposite to each other or to flow towards each other.
  • the EP 0 982 089 A1 describes a method for process monitoring in die casting or thixoforming of metals.
  • liquid metal is injected via a sprue in a mold cavity in a die casting, which consists of a fixed and a movable mold half.
  • sensors are arranged for temperature measurement.
  • the measured characteristic values are compared as actual values with corresponding nominal values. If the actual values deviate from the setpoints excessively, either an alarm is triggered (if the deviation moves within a tolerance range) or the die casting process is aborted (if the tolerance range is exceeded).
  • the acquisition of the measured data takes place in real time.
  • the data is controlled, displayed and archived. This monitoring system maintains a consistently high quality standard.
  • the object of the present invention is, when casting a molten metal, in particular a semi-molten casting pulp, to control the time course of the melt flow starting from a plurality of sprue points into the casting mold in such a way that the position of at least one contact surface of filling fronts entering the casting mold is reproducibly in one Series of casting operations can be controlled.
  • a casting mold having a cavity and a plurality of sprue points, in particular hot runner exit points or nozzles, is provided.
  • a light metal melt is introduced into the casting mold for producing a first cast component by at least two sprue points, in particular hot runner exit points or nozzles, each having a temperature and a pressure.
  • the light metal melt flows along at least two paths in at least two streams (one stream per path), in particular oppositely flowing streams, each with a front into the mold, wherein at least two fronts of the streams meet in a region of the casting mold. At least one temperature and / or at least a pressure in the region in which the currents meet, measured.
  • the measured temperature and / or the measured pressure are taken into account during the subsequent production of a second cast component in the casting mold for the selection of the respective temperature and / or the respective pressure and / or the respective triggering time at the respective sprue point during the introduction of the light metal melt.
  • the procedure according to the invention makes it possible to actively reliably control or regulate the position of the contact surfaces of the filling fronts. In this way, it is achieved that the material flow of the molten metal into the casting mold takes place in a manner compatible with the component, in particular in a way that is reproducible in terms of geometry. In particular, it can be realized that the filling fronts contact one another at intended points. It is particularly preferred if the contact takes place in the vicinity of a vacuum outlet of the casting mold.
  • the method is preferably an injection molding process.
  • the sprue points can in particular be tempered.
  • the casting mold can then also be referred to as a hot runner casting mold.
  • the light metal melt is fluid, in particular flowable.
  • one or more sensors, detectors, measuring probes or the like can be used.
  • the sensor or sensors, detectors or probes may be incorporated on or in the mold.
  • the respective temperature and / or the respective pressure at the multiple gate points for the subsequent production of a further cast component can be adjusted as a function of the measured temperature.
  • a change in the set respective temperature and / or the set respective pressure at the multiple gating points can be effected as a function of the deviation of the measured temperature, the actual temperature, from a predetermined temperature, a desired temperature.
  • the single measurement or multiple measurements may be made initially for one or more first components of the series, with subsequent products being made with the found optimized settings, or made periodically during production of the series so as to take into account previous measurements for the manufacture of subsequent products ,
  • the light metal melt is introduced into the mold with elevated pressure compared to the ambient pressure.
  • the method may be a so-called die casting method in which at least when filling the mold pressure forces greater than the ambient pressure on the molten metal melt act.
  • a light metal is understood in this illustration to mean a metal whose density is less than 5 g / cm 3 .
  • the metals are aluminum, magnesium, titanium, lithium and strontium light metals.
  • the light metals are aluminum, magnesium and titanium, since they are workable with tools.
  • an aluminum alloy or a magnesium alloy is used as light metal.
  • the term alloy also includes the pure metal, which is essentially, in particular within production-related foreign components and / or impurities, free of other constituents.
  • a semisolid (semi-solid) G imaginebrei with solid phase content or solids content is used. That is, the light metal melt is poured as a semi-solid G imaginebrei, in particular, with a non-dendritic, preferably globulitician solid phase portion.
  • the molten metal may be fluid, in particular flowable, liquid, mushy, muddy, doughy or pasty.
  • the molten metal may have been cooled to a temperature below the liquidus temperature.
  • the processed molten metal may be thixotropic.
  • the molten metal may in particular globulitic and / or non-dendritic Solid, for example, spherical or ellipsoid solids, in the liquid phase portion.
  • the light metal melt is discharged at the at least two sprue points by hot runner nozzles whose temperature and / or their pressure is adjusted.
  • the material flow of the molten metal into the casting mold can be controlled in an advantageous manner with regard to the quantity and the time course of the volume flow.
  • a temperature distribution and / or a pressure distribution are measured over a specific path or section in the region in which the streams meet.
  • measured values can be taken at a number of measuring points, for example at two measuring points on the opposite sides of the expected position of the contact surface of two filling fronts.
  • differences in the values of the parameters in particular with regard to the values of the parameters assigned to the individual filling fronts, can be detected, so that individual separate measures for adjusting the temperature and / or pressure at the respective sprue points are derived from this information and subsequently carried out can be.
  • the method according to the invention makes or to make an adjustment of the respective temperature and / or the respective pressure at the respective sprue point when introducing the light metal melt such that during each individual production of a cast component in FIG In the series, the streams essentially meet one another at the same location and, on the other hand, at the same temperature and / or pressure within tolerance intervals. If a series of products is manufactured in this way, then the position of the contact surface of the filling streams can be adjusted in a targeted manner. In this case, contact surfaces can be placed at desired positions for the specific product geometry, for example those in which a structural weakening of the product is desired.
  • the device according to the invention may preferably suitably carry out a method for producing a series of cast components with individual or all Be features or feature combinations according to this representation.
  • the device comprises a mold having a cavity and a plurality of sprue points, through which a light metal melt, each with a temperature and pressure in the mold can be introduced such that the light metal melt along at least two paths in at least two streams, each with a front into the mold flows, wherein at least two fronts of the streams meet in a region of the mold. It further comprises at least one device for measuring the temperature and / or at least one device for measuring the pressure, which are arranged in the region in which the streams meet.
  • the device comprises a temperature and / or pressure control device at the plurality of gate points for taking into account the measured temperature and / or the measured pressure in the subsequent production of a second cast component in the mold for the selection of the respective temperature and / or the respective Pressure at the respective sprue point when introducing the light metal melt.
  • control device of the device may have a computing unit and a software program running on the arithmetic unit, which enables a calculation or retrieval of values of temperature and / or pressure to be set at the plurality of sprue points for subsequent casting operations as a function of the measured values , and / or contain one or more tables (look-up tables), which permit an assignment of respective values of temperature and / or pressure to be set at the plurality of gating points in function of the measured values.
  • the topology of the cavity can be complex so that detailed structured components are available as products.
  • the cavity of the mold may be a not simply connected space. Expressed more vividly, within the cavity there can exist at least one closed path that contracts steadily to a point outside the cavity, in other words, shortens with the inclusion of the orbited center.
  • the cavity can be like a frame, lattice-like or net-like or have handle-like space regions with at least two transition points to the residual volume.
  • At least one of the gate points is formed by the outlet of a hot runner nozzle.
  • tempering devices of the hot runner nozzles are activated with the values determined as a function of the measured values.
  • the control device can be designed such that it also performs the control of the temperature control of the hot runner nozzles.
  • a temperature control can be for example a cooling device, preferably a CO 2 impulse cooling.
  • cast components are available in series with consistently high quality.
  • the invention therefore provides a cast component that is obtained in a method with individual or all features or feature combinations according to this representation and / or by means of a device with individual or all features or feature combinations according to this representation.
  • the cast components may be structural components for assemblies of a vehicle, in particular an agricultural vehicle, a wheeled vehicle, for example a trackless automobile.
  • the FIG. 1 is a sketch of a casting tool with two hot runner nozzles for carrying out an embodiment of a method according to the invention for producing a series of cast components.
  • the casting mold 30 is a casting mold 10, which has a frame-like cavity.
  • hot runner 12 is the mold 10 at a first hot runner nozzle 14 and a second hot runner 16 in operation a light metal melt, here a magnesium melt fed as a semi-solid cast pulp in the die casting.
  • the semisolid casting slurry flows through the cavity in streams in various ways such that in each case two converging fronts of the streams meet in two regions of the casting mold 10, whereby a contact surface is formed.
  • a temperature controller 20 is connected to four temperature sensors 24, and a pressure controller 22 with four pressure sensors 26 for data transmission ,
  • a temperature sensor 24 and a pressure sensor 26 are adapted to measure the prevailing temperature or the prevailing pressure at a position which passes one of the cavities filling the streams ofchtmetallg cordbreis before he meets with the oncoming stream and forms a contact surface.
  • the position about 350 to 450 mm in this embodiment is away from the expected position of the contact surface.
  • FIG. 2 outlined a structure of a system for controlling an embodiment of a method according to the invention for producing a series of cast components, which already in connection with the FIG. 1 designated components like reference numerals are used. It is possible to calculate or to predict at which point the two contact surfaces are formed for a specific production process of a cast component from the progressions of the parameters temperature or pressure respectively measured as a function of time at the four different locations. The course of the measured parameters is dependent on the setting parameters, in particular the time, the temperature and the pressure, when introducing the casting slug through the hot runner nozzles 14, 16. Therefore, the parameters measured at the various locations of the parameters Temperature or pressure can be influenced by one, several or all adjustment parameters are changed.
  • signals from the temperature controller 20 and the pressure controller 22 are transmitted to a hot runner controller 28.
  • the hot runner control device 28 it is determined which specific controls, which specific values of the adjustment parameters, are required in order to achieve desired profiles of the parameters temperature or pressure at the specific different locations. For this purpose, the corresponding functional relationship is deposited in the hot runner control device 28, for example in the form of tables.
  • the hot runner controller 28 then controls the individual hot runner nozzles 14,16 accordingly.
  • FIG. 3 shows an enlarged view of the hot runner 12 with two hot runner nozzles 14,16.
  • the feeding of the light metal melt, here the magnesium alloy is effected by a common supply line, which branches to the individual outlets.
  • Both an adjustable pressure generating device and an adjustable tempering device are provided on each of the hot runner nozzles 14,16, so that the pressure and temperature parameters prevailing during die casting can be controlled.
  • a further development also includes pairs of sensors (temperature sensors and pressure sensors) each near the hot runner nozzles 14,16, quantitatively about 350 to 450 mm away from their position in the two directions into which the light metal melt flows into the cavity , as a result, additional information about the development over time of parameters of the molten metal, in particular its temperature, can be obtained and advantageously also taken into account in the method according to the invention.
  • the magnesium alloy AZ91 should be mentioned here.
  • This can be processed according to the invention in the form of a thixotropic casting slurry in the temperature range from 560 to 620 degrees Celsius.
  • the temperature is typically 585 degrees Celsius ⁇ 10 degrees Celsius.
  • the solid phase content varies in the specified temperature interval partially sensitive to the temperature, so that the consideration according to the invention of the measured temperatures and pressures in areas where currents of the incoming molten magnesium in the mold, special importance to achieve a uniform quality in a series of manufactured castings achieve.

Claims (9)

  1. Procédé de fabrication d'une série de composants coulés, dans lequel un moule de coulée (10) présentant une cavité et plusieurs points d'injection est réalisé, un métal léger fondu est apporté dans le moule de coulée (10) par au moins deux points d'injection, chaque fois à une température et à une pression, pour fabriquer un premier composant coulé et le métal léger fondu pénètre dans le moule de coulée le long d'au moins deux parcours, en au moins deux écoulements qui présentent chacun un front, au moins deux fronts d'écoulement se rassemblant dans une partie du moule de coulée,
    caractérisé en ce que
    au moins une température et/ou au moins une pression sont mesurées là où les écoulements se rejoignent et la température mesurée et/ou la pression mesurée sont prises en compte lors de la fabrication ultérieure d'un deuxième composant coulé dans le moule de coulée (10) et
    en ce que pour la sélection de la température et/ou de la pression et/ou de l'instant de déclenchement respectif de chaque point d'injection lors de l'apport du métal léger fondu, des valeurs de mesure sont prises en deux points de mesure situés sur des côtés mutuellement opposés de la position attendue de la surface de contact de deux fronts de remplissage.
  2. Procédé de fabrication d'une série de composants coulés selon la revendication 1, caractérisé en ce que le métal léger fondu est apporté dans le moule de coulée (10) à une pression plus élevée que la pression ambiante.
  3. Procédé de fabrication d'une série de composants coulés selon les revendications 1 ou 2, caractérisé en ce que le métal léger est un alliage d'aluminium ou un alliage de magnésium et en ce que le métal léger fondu est coulé sous la forme d'une pâte de coulée semi-solide présentant une fraction solide.
  4. Procédé de fabrication d'une série de composants coulés selon l'une des revendications 1 à 3, caractérisé en ce que le métal léger fondu est apporté en au moins deux points d'injection par des tuyères à canal chauffé dont la température et/ou la pression sont réglées.
  5. Procédé de fabrication d'une série de composants coulés selon l'une des revendications 1 à 4, caractérisé en ce qu'une répartition de température et/ou une répartition de pression sont mesurées sur un parcours défini là où les écoulements se rassemblent.
  6. Procédé de fabrication d'une série de composants coulés selon l'une des revendications 1 à 5, caractérisé en ce qu'un réglage de la température et/ou de la pression en chaque point d'injection s'effectue lors de l'apport du métal léger fondu de telle sorte que lors de la fabrication de chaque pièce coulée de la série, les fronts de remplissage des écoulements entrent en contact mutuel de manière reproductible en des points prévus du moule de coulée et à la même température et/ou la même pression à l'intérieur d'intervalles de tolérances.
  7. Ensemble de fabrication d'une série de composants coulés par un procédé selon l'une des revendications 1 à 6 qui précèdent, présentant un moule de coulée (10) doté d'une cavité et de plusieurs points d'injection (14, 16) par lesquels un métal léger fondu peut être apporté dans le moule de coulée, chaque fois à une température et à une pression telles que le métal léger fondu pénètre dans le moule de coulée (10) le long d'au moins deux parcours en au moins deux écoulements qui présentent chacun un front, au moins deux fronts des écoulements se rassemblant dans une partie du moule de coulée (10),
    caractérisé par
    au moins un dispositif (20, 24) de mesure de la température et/ou au moins un dispositif (22, 26) de mesure de la pression disposés dans la partie dans laquelle les écoulements se rassemblent et
    par un appareil de régulation (28) de la température et/ou de la pression en les différents points d'injection, pour tenir compte de la température mesurée et/ou de la pression mesurée lors de la réalisation ultérieure d'un deuxième composant coulé dans le moule de coulée (10), pour la sélection de la température et/ou de la pression lors de chaque point d'injection lors de l'apport du métal léger fondu.
  8. Ensemble de fabrication d'un composant coulé selon la revendication 7, caractérisé en ce que la cavité du moule de coulée (10) est un espace non simplement congruent.
  9. Ensemble de fabrication d'un composant coulé selon les revendications 7 ou 8, caractérisé en ce qu'au moins l'un des points d'injection est formé par la sortie (14, 16) d'une tuyère à canal chauffé.
EP11007794.8A 2010-12-01 2011-09-26 Procédé de fabrication d'une série de composants en fonte et dispositif de fabrication d'un composant en fonte Active EP2460605B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010053125A DE102010053125A1 (de) 2010-12-01 2010-12-01 Verfahren zum Herstellen einer Serie von Gussbauteilen und Vorrichtung zum Herstellen eines Gussbauteils

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Publication Number Publication Date
EP2460605A1 EP2460605A1 (fr) 2012-06-06
EP2460605B1 true EP2460605B1 (fr) 2015-11-11

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DE (1) DE102010053125A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT517860B1 (de) * 2015-10-27 2020-02-15 Christian Platzer Verfahren und Vorrichtung zur Herstellung zumindest eines Formteils

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1230459A (fr) * 1985-04-30 1987-12-22 Gellert, Jobst Ulrich Pointeau-sonde regulateur d'apport
JPH02192865A (ja) * 1989-01-20 1990-07-30 Ube Ind Ltd 射出成形方法および射出成形装置
DE3931194A1 (de) * 1989-09-19 1991-03-28 Laukoetter Gmbh Warmkammer-druckgussmaschine
WO1994012390A2 (fr) * 1992-11-24 1994-06-09 United Technologies Corporation Structure d'aube de rotor refroidie
ES2127321T3 (es) * 1993-10-16 1999-04-16 Mueller Weingarten Maschf Maquina automatica moldeadora por inyeccion o por presion y procedimiento para el registro del frente de la masa fundida.
DE4444092C2 (de) 1994-10-12 1997-02-13 Werner Kotzab Verfahren und Anordnung zum Temperieren einer Spritzgießform mit wenigstens einer beheizten Düse oder einem Heißkanal
DE19606806C2 (de) * 1996-02-23 1998-01-22 Kurt Dipl Ing Detering Vorrichtung zum Thixoforming
AUPP060497A0 (en) * 1997-11-28 1998-01-08 Commonwealth Scientific And Industrial Research Organisation Magnesium pressure die casting
JP3494020B2 (ja) * 1998-07-03 2004-02-03 マツダ株式会社 金属の半溶融射出成形方法及びその装置
EP0976475A1 (fr) * 1998-07-30 2000-02-02 Alusuisse Technology & Management AG Système d' orifice de coulée pour la fabrication de pièces moulées à partir d' un lingot métallique thixotrope dans des machines de coulée sous pression
EP0982089A1 (fr) * 1998-08-27 2000-03-01 Alusuisse Technology & Management AG Procédé de contrôle le processus de couler à pression ou formage thixotropique
DE102008052062A1 (de) 2008-10-17 2010-04-22 Dr.Ing.H.C.F.Porsche Aktiengesellschaft Verfahren zur Herstellung eines rahmenartigen Strukturbauteils

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EP2460605A1 (fr) 2012-06-06

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