EP1105237B1 - Procede de surveillance de processus s'utilisant lors du moulage sous pression ou du thixoformage de metaux - Google Patents

Procede de surveillance de processus s'utilisant lors du moulage sous pression ou du thixoformage de metaux Download PDF

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Publication number
EP1105237B1
EP1105237B1 EP99944412A EP99944412A EP1105237B1 EP 1105237 B1 EP1105237 B1 EP 1105237B1 EP 99944412 A EP99944412 A EP 99944412A EP 99944412 A EP99944412 A EP 99944412A EP 1105237 B1 EP1105237 B1 EP 1105237B1
Authority
EP
European Patent Office
Prior art keywords
calculated
time
temperature
variation
solidification
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99944412A
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German (de)
English (en)
Other versions
EP1105237A1 (fr
Inventor
Christophe Bagnoud
Miroslaw Plata
Jürgen Wüst
Klaus Währisch
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.)
3A Composites International AG
Original Assignee
Alcan Technology and Management Ltd
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Filing date
Publication date
Application filed by Alcan Technology and Management Ltd filed Critical Alcan Technology and Management Ltd
Priority to EP99944412A priority Critical patent/EP1105237B1/fr
Publication of EP1105237A1 publication Critical patent/EP1105237A1/fr
Application granted granted Critical
Publication of EP1105237B1 publication Critical patent/EP1105237B1/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
    • B22D17/32—Controlling equipment

Definitions

  • the invention relates to a method for process monitoring in die casting or thixoforms of metals in a vacuum in a mold.
  • the invention has for its object a method of the aforementioned To create the way with which the production of die-cast and thixoform parts continuously and reliably monitored under production conditions can be.
  • the temporal course leads to the achievement of the object according to the invention the temperature is continuously measured at at least one point in the system and by means of a program the temperature curve of the system in Real time is calculated, and that from the temperature curve of the system the temporal course of the heat flow and from the heat flow the temporal Course of the energy of the system and the amount of heat of solidification of the in the shape of solidified metal is calculated, at a specified time calculated values can be used as characteristic values for monitoring.
  • the amount of heat per unit time between the metal to be cast and exchanging the mold halves determines the rate of solidification of the part produced by die casting or thixoforming. Since the Characteristics of this exchange directly the mechanical properties of the die-cast or thixiform part is the monitoring of Solidification of the metal in the form to maintain a high quality standard essential.
  • the detection of the amount of solidification heat dissipated via the mold enables it u.a. determine whether the solidification is completely within the shape takes place whether pre-solidification occurs or what liquid-solid ratio is present in a thixomaterial.
  • the amount of latent heat depends on the liquid metal content Filling the mold cavity.
  • the amount of dispensed over the mold halves latent heat in turn depends on the metal to be cast or on the alloy used and can further by the temperature of the mold or the mold halves, by the pressure exerted, by the piston speed as well as the thickness of the lubricant layer.
  • the heat exchange that occurs during the various phases of solidification takes place is calculated using a program.
  • the calculations lie Based on temperature measurements on the mold, preferably the temperature measured in the mold wall and the temporal course of the temperature is calculated on the shaping surface of the mold.
  • the program takes into account inverse heat conduction and calculates the temperature in real time the shaping surface of the mold halves and the heat exchange between the solidifying metal and the shape. With those arranged in this way Temperature sensors can ensure the uniformity of the cooling process and the thermal equilibrium on the mold surface in the different successive phases of casting and cooling in Be monitored in real time. The sensors are therefore preferred in places arranged where the thermal equilibrium and solidification are good too are recorded.
  • a characteristic value for the amount of solidification heat dissipated at a specified time is preferably between about 20% and 100%, in particular between about 50% and 100% of the maximum amount of solidification heat.
  • the time course of the Heat exchange coefficients can be calculated.
  • the one at a particular Time calculated value for the heat exchange coefficient e.g. the maximum values in the solidification or cooling phase, or also the entire curve, can be used as additional parameters.
  • the time course of the solidification length can be derived from the time course of the temperature be calculated.
  • the solidification length is that of Mold surface understood from the measured thickness of the solidified metal.
  • the solidification length calculated at a specified time can be used as a further additional length Characteristic value can be used.
  • the calculated or measured characteristic values can be used for process monitoring are compared as actual values with corresponding target values, whereby it can be provided that in the event of an impermissibly large deviation of the actual values an alarm is triggered by the setpoints within a tolerance range and if the tolerance range of the die casting or thixoforming process is exceeded is interrupted.
  • the setpoint for the amount of solidification heat removed is, for example given as the mean with a standard deviation.
  • the standard deviation can be set as the first tolerance limit, for example Exceeded by the actual value triggers an alarm.
  • Deviations of the actual values from the target values are in real time recorded so that appropriate corrective action can be taken quickly can be.
  • a particularly interesting field of application of the method lies in Die casting and thixoforming, in particular of aluminum and magnesium alloys, for example for the production of safety components for the Vehicle industry.
  • the examination results shown in FIG. 8 show that with the monitoring method according to the invention with regard to the solidification process a high quality standard can be achieved. deviations are displayed immediately online.
  • the calculated values can, for example via a RS232 interface to a programmable machine, which controls the die casting machine.
  • the data are checked, if necessary displayed and finally archived. Fall the calculated Values for the amount of solidification in the tolerance range R, see above an alarm can be triggered directly by the machine. With more deviating Values that fall within the range S can, for example, be automatic Production stop can be triggered.
  • Process monitoring can be carried out at various points in the mold halves Temperature sensors are arranged. The calculations are preferred carried out individually for the individual temperature sensors and also individually recorded as monitoring results. In this way it is possible to locate specific production problems on the mold. The recorded Monitoring results are conveniently archived and can later be used, for example, to prove the production quality of a particular Die-cast or thixiform part can be used.
  • a die casting system 10 has a filling chamber 12 with a filling chamber cavity 14 on. That from a furnace 18 via a feed line 20 for everyone Shot in the filling chamber cavity 14 filled with liquid metal a piston 16 via a sprue 22 from the filling chamber cavity 14 in one of a fixed mold half 24 and a movable mold half 26 formed mold cavity 28 shot.
  • the mold cavity 28 has one or more ventilation channels 30 which possibly combined into a collecting channel.
  • a control insert 32 with a control pin 34 arranged in the fixed Mold half 24 .
  • the control bolt 34 has a locking head 36 for opening or closing the ventilation channel 30.
  • the shift of the Control bolt 34 is carried out by means of an actuating cylinder 38. When this is done The mold is filled via the locking head 36 of the control bolt 34 the ventilation channel 30 is closed at the end of the mold cavity 28.
  • a vacuum line 40 connects to the control insert 32 Valves 42 connected to a vacuum container, not shown in the drawing is. Before the metal is shot into the mold cavity 28 this evacuates and the time course of the pressure in the mold cavity 28 over a pressure sensor 44 connected into the vacuum line 40 is measured.
  • Temperature sensors are located at different points in the two mold halves 24, 26 46 arranged. Not shown in the drawing is one with the Mold cavity related probe to measure relative Humidity.
  • the temperature sensors 46, the pressure sensor 44 and the one not shown Probe for measuring the relative humidity are connected to a program-controlled Computer 48 connected.
  • This computer transfers the measured and calculated parameters to a data acquisition device 50 for monitoring and archiving.
  • the triggering of an alarm or a production stop if tolerance values for individual or all characteristic values are exceeded takes place directly on the computer.

Claims (12)

  1. Procédé de surveillance de processus lors du coulage sous pression ou du thixoformage de métaux sous vide dans un moule,
    caractérisé en ce que
    l'évolution dans le temps de la température (T) est mesurée en continu en au moins un emplacement du système et l'évolution de la température de système est calculée en temps réel au moyen d'un programme, et en ce qu'à partir de l'évolution de la température du système, l'évolution dans le temps du flux de chaleur (W) est calculée, et à partir du flux de chaleur, l'évolution dans le temps de l'énergie (U) du système ainsi que la quantité de chaleur de solidification (UE) du métal solidifié dans le moule sont calculés, et des valeurs calculées à un instant défini sont utilisées comme valeurs caractéristiques pour la surveillance.
  2. Procédé selon la revendication 1, caractérisé en ce que la température (T) dans la paroi du moule est mesurée et l'évolution dans le temps de la température (T0) sur la surface de moulage du moule est calculée.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'une valeur caractéristique de la quantité de chaleur de solidification (UE1) évacuée à un instant (t1) défini lors du moulage sous pression est située entre 20 % et 100 %, de préférence entre 50 % et 100 % de la quantité maximale de chaleur de solidification (UEmax)·
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que comme valeur caractéristique lors du moulage sous pression, on calcule la quantité de chaleur de solidification (UE1) à un instant fixé (t1) entre 0,1 et 2 s, de préférence entre 0,3 e 0,8 s et en particulier à environ 0,5 s.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la température (Tv) de la surface de moulage calculée immédiatement avant chaque injection est utilisée comme autre valeur caractéristique.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce qu'à partir de l'évolution dans le temps de la température (T), on calcule l'évolution dans le temps du coefficient d'échange de chaleur (h) et le coefficient d'échange de chaleur est utilisé comme autre valeur caractéristique.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce qu'à partir de l'évolution dans le temps de l'énergie (U) du système, on utilise comme autre valeur caractéristique la différence (ΔU) entre les valeurs de l'énergie au début du remplissage du moule lors d'injections successives.
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce qu'à partir de l'évolution dans le temps de la température (T), on calcule l'évolution dans le temps de la distance de solidification et la distance de solidification calculée à un instant défini est utilisée comme autre valeur caractéristique.
  9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce que l'évolution dans le temps de la pression (p) dans le moule est mesurée, et la pression minimale (Pmin) est utilisée comme autre valeur caractéristique.
  10. Procédé selon l'une des revendications 1 à 9, caractérisé en ce que l'humidité relative minimale (rH) est mesurée dans le moule immédiatement avant chaque injection et est utilisée comme autre valeur caractéristique.
  11. Procédé selon l'une des revendications 1 à 10, caractérisé en ce que les valeurs caractéristiques calculées ou mesurées servant de valeurs effectives sont comparées à des valeurs de consigne correspondantes.
  12. Procédé selon la revendication 11, caractérisé en ce qu'en cas d'écart important inadmissible entre les valeurs effectives et les valeurs de consigne à l'intérieur d'une plage de tolérance, une alarme est déclenchée, et en cas de dépassement de la plage de tolérance, l'opération de moulage sous pression ou de thixoformage est interrompue.
EP99944412A 1998-08-27 1999-08-16 Procede de surveillance de processus s'utilisant lors du moulage sous pression ou du thixoformage de metaux Expired - Lifetime EP1105237B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99944412A EP1105237B1 (fr) 1998-08-27 1999-08-16 Procede de surveillance de processus s'utilisant lors du moulage sous pression ou du thixoformage de metaux

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP98810846 1998-08-27
EP98810846A EP0982089A1 (fr) 1998-08-27 1998-08-27 Procédé de contrôle le processus de couler à pression ou formage thixotropique
PCT/EP1999/006002 WO2000012246A1 (fr) 1998-08-27 1999-08-16 Procede de surveillance de processus s'utilisant lors du moulage sous pression ou du thixoformage de metaux
EP99944412A EP1105237B1 (fr) 1998-08-27 1999-08-16 Procede de surveillance de processus s'utilisant lors du moulage sous pression ou du thixoformage de metaux

Publications (2)

Publication Number Publication Date
EP1105237A1 EP1105237A1 (fr) 2001-06-13
EP1105237B1 true EP1105237B1 (fr) 2002-05-29

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ID=8236284

Family Applications (2)

Application Number Title Priority Date Filing Date
EP98810846A Withdrawn EP0982089A1 (fr) 1998-08-27 1998-08-27 Procédé de contrôle le processus de couler à pression ou formage thixotropique
EP99944412A Expired - Lifetime EP1105237B1 (fr) 1998-08-27 1999-08-16 Procede de surveillance de processus s'utilisant lors du moulage sous pression ou du thixoformage de metaux

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP98810846A Withdrawn EP0982089A1 (fr) 1998-08-27 1998-08-27 Procédé de contrôle le processus de couler à pression ou formage thixotropique

Country Status (9)

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US (1) US6557617B1 (fr)
EP (2) EP0982089A1 (fr)
AT (1) ATE218081T1 (fr)
CA (1) CA2341264A1 (fr)
DE (1) DE59901565D1 (fr)
DK (1) DK1105237T3 (fr)
ES (1) ES2176025T3 (fr)
PT (1) PT1105237E (fr)
WO (1) WO2000012246A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7886807B2 (en) * 2007-06-15 2011-02-15 Die Therm Engineering L.L.C. Die casting control method
JP4889783B2 (ja) * 2009-11-17 2012-03-07 日信工業株式会社 重力鋳造方法
DE102010053125A1 (de) * 2010-12-01 2012-06-06 Volkswagen Ag Verfahren zum Herstellen einer Serie von Gussbauteilen und Vorrichtung zum Herstellen eines Gussbauteils
DE102012220513B4 (de) * 2012-11-12 2023-02-16 Bayerische Motoren Werke Aktiengesellschaft Verfahren und Vorrichtung zur Herstellung eines Druckgussteils

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57187154A (en) * 1981-05-15 1982-11-17 Toyota Motor Corp Method and device for inspecting quality of product produced by die casting machine
US4493362A (en) * 1982-05-27 1985-01-15 Ex-Cell-O Corporation Programmable adaptive control method and system for die-casting machine
ATE46843T1 (de) * 1983-05-20 1989-10-15 John Mickowski Verfahren zum ueberwachen und steuern von periodisch arbeitenden form- und giessmaschinen und eine vorrichtung zur durchfuehrung dieses verfahrens.
US4976305A (en) * 1987-12-01 1990-12-11 Honda Giken Kogyo Kabushiki Kaisha Method of and apparatus for controlling die temperature in low-pressure casting process
US5407000A (en) * 1992-02-13 1995-04-18 The Dow Chemical Company Method and apparatus for handling molten metals
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
US5772933A (en) 1994-10-12 1998-06-30 Kotzab; Werner Method for tempering an injection mold having at least one heated nozzle or hot runner
US5758707A (en) * 1995-10-25 1998-06-02 Buhler Ag Method for heating metallic body to semisolid state
US6148899A (en) * 1998-01-29 2000-11-21 Metal Matrix Cast Composites, Inc. Methods of high throughput pressure infiltration casting

Also Published As

Publication number Publication date
WO2000012246A1 (fr) 2000-03-09
DK1105237T3 (da) 2002-09-23
EP0982089A1 (fr) 2000-03-01
US6557617B1 (en) 2003-05-06
DE59901565D1 (de) 2002-07-04
CA2341264A1 (fr) 2000-03-09
ES2176025T3 (es) 2002-11-16
PT1105237E (pt) 2002-09-30
ATE218081T1 (de) 2002-06-15
EP1105237A1 (fr) 2001-06-13

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