EP0982089A1 - Verfahren zur Prozessüberwachung beim Druckgiessen oder Thixoformen von Metallen - Google Patents

Verfahren zur Prozessüberwachung beim Druckgiessen oder Thixoformen von Metallen Download PDF

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Publication number
EP0982089A1
EP0982089A1 EP98810846A EP98810846A EP0982089A1 EP 0982089 A1 EP0982089 A1 EP 0982089A1 EP 98810846 A EP98810846 A EP 98810846A EP 98810846 A EP98810846 A EP 98810846A EP 0982089 A1 EP0982089 A1 EP 0982089A1
Authority
EP
European Patent Office
Prior art keywords
calculated
mold
temperature
time
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.)
Withdrawn
Application number
EP98810846A
Other languages
German (de)
English (en)
French (fr)
Inventor
Cristophe 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
Alusuisse Lonza Services Ltd
Alusuisse Technology and Management Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alusuisse Lonza Services Ltd, Alusuisse Technology and Management Ltd filed Critical Alusuisse Lonza Services Ltd
Priority to EP98810846A priority Critical patent/EP0982089A1/de
Priority to PT99944412T priority patent/PT1105237E/pt
Priority to CA002341264A priority patent/CA2341264A1/en
Priority to EP99944412A priority patent/EP1105237B1/de
Priority to US09/763,527 priority patent/US6557617B1/en
Priority to DK99944412T priority patent/DK1105237T3/da
Priority to PCT/EP1999/006002 priority patent/WO2000012246A1/de
Priority to DE59901565T priority patent/DE59901565D1/de
Priority to AT99944412T priority patent/ATE218081T1/de
Priority to ES99944412T priority patent/ES2176025T3/es
Publication of EP0982089A1 publication Critical patent/EP0982089A1/de
Withdrawn legal-status Critical Current

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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
    • 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 indispensable.
  • 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.
  • 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 Automotive 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Continuous Casting (AREA)
EP98810846A 1998-08-27 1998-08-27 Verfahren zur Prozessüberwachung beim Druckgiessen oder Thixoformen von Metallen Withdrawn EP0982089A1 (de)

Priority Applications (10)

Application Number Priority Date Filing Date Title
EP98810846A EP0982089A1 (de) 1998-08-27 1998-08-27 Verfahren zur Prozessüberwachung beim Druckgiessen oder Thixoformen von Metallen
PT99944412T PT1105237E (pt) 1998-08-27 1999-08-16 Processo para a monitorizacao do processamento na moldacao por injeccao por pressao ou na moldacao tixotropica de metais
CA002341264A CA2341264A1 (en) 1998-08-27 1999-08-16 Method for process monitoring during die casting or thixoforming of metals
EP99944412A EP1105237B1 (de) 1998-08-27 1999-08-16 Verfahren zur prozessüberwachung beim druckgiessen oder thixoformen von metallen
US09/763,527 US6557617B1 (en) 1998-08-27 1999-08-16 Method for process monitoring during die casting or thixoforming of metals
DK99944412T DK1105237T3 (da) 1998-08-27 1999-08-16 Fremgangsmåde til procesovervågning ved trykstøbining eller thixoformning af metaller
PCT/EP1999/006002 WO2000012246A1 (de) 1998-08-27 1999-08-16 Verfahren zur prozessüberwachung beim druckgiessen oder thixoformen von metallen
DE59901565T DE59901565D1 (de) 1998-08-27 1999-08-16 Verfahren zur prozessüberwachung beim druckgiessen oder thixoformen von metallen
AT99944412T ATE218081T1 (de) 1998-08-27 1999-08-16 Verfahren zur prozessüberwachung beim druckgiessen oder thixoformen von metallen
ES99944412T ES2176025T3 (es) 1998-08-27 1999-08-16 Procedimiento de vigilancia del proceso de fundicion a presion o tixomoldeo de metales.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98810846A EP0982089A1 (de) 1998-08-27 1998-08-27 Verfahren zur Prozessüberwachung beim Druckgiessen oder Thixoformen von Metallen

Publications (1)

Publication Number Publication Date
EP0982089A1 true EP0982089A1 (de) 2000-03-01

Family

ID=8236284

Family Applications (2)

Application Number Title Priority Date Filing Date
EP98810846A Withdrawn EP0982089A1 (de) 1998-08-27 1998-08-27 Verfahren zur Prozessüberwachung beim Druckgiessen oder Thixoformen von Metallen
EP99944412A Expired - Lifetime EP1105237B1 (de) 1998-08-27 1999-08-16 Verfahren zur prozessüberwachung beim druckgiessen oder thixoformen von metallen

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP99944412A Expired - Lifetime EP1105237B1 (de) 1998-08-27 1999-08-16 Verfahren zur prozessüberwachung beim druckgiessen oder thixoformen von metallen

Country Status (9)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2460605A1 (de) * 2010-12-01 2012-06-06 Volkswagen AG Verfahren zum Herstellen einer Serie von Gussbauteilen und Vorrichtung zum Herstellen eines Gussbauteils
WO2014072188A1 (de) * 2012-11-12 2014-05-15 Bayerische Motoren Werke Aktiengesellschaft Verfahren und vorrichtung zur herstellung eines druckgussteils

Families Citing this family (2)

* 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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0065841A2 (en) * 1981-05-15 1982-12-01 Toyota Jidosha Kabushiki Kaisha Method of and apparatus for inspecting the quality of a casting produced by a die-casting machine
EP0126174A1 (en) * 1983-05-20 1984-11-28 John Mickowski Process for monitoring and controlling intermittently working molding and casting devices and apparatus for performing said process
US4493362A (en) * 1982-05-27 1985-01-15 Ex-Cell-O Corporation Programmable adaptive control method and system for die-casting machine
DE4444092A1 (de) * 1994-10-12 1996-04-18 Werner Kotzab Verfahren und Anordnung zum Temperieren einer Spritzgießform mit wenigstens einer beheizten Düse oder einem Heißkanal

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0065841A2 (en) * 1981-05-15 1982-12-01 Toyota Jidosha Kabushiki Kaisha Method of and apparatus for inspecting the quality of a casting produced by a 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
EP0126174A1 (en) * 1983-05-20 1984-11-28 John Mickowski Process for monitoring and controlling intermittently working molding and casting devices and apparatus for performing said process
DE4444092A1 (de) * 1994-10-12 1996-04-18 Werner Kotzab Verfahren und Anordnung zum Temperieren einer Spritzgießform mit wenigstens einer beheizten Düse oder einem Heißkanal

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"SYSTEM ZUR UBERWACHUNG DER HEIZ-/KUHLKREISLAUFE IM DRUCKGIESSPROZESS", GIESSEREI, vol. 81, no. 13, 11 July 1994 (1994-07-11), pages 452/453, XP000457407 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2460605A1 (de) * 2010-12-01 2012-06-06 Volkswagen AG Verfahren zum Herstellen einer Serie von Gussbauteilen und Vorrichtung zum Herstellen eines Gussbauteils
WO2014072188A1 (de) * 2012-11-12 2014-05-15 Bayerische Motoren Werke Aktiengesellschaft Verfahren und vorrichtung zur herstellung eines druckgussteils

Also Published As

Publication number Publication date
ES2176025T3 (es) 2002-11-16
DE59901565D1 (de) 2002-07-04
PT1105237E (pt) 2002-09-30
EP1105237A1 (de) 2001-06-13
EP1105237B1 (de) 2002-05-29
ATE218081T1 (de) 2002-06-15
DK1105237T3 (da) 2002-09-23
WO2000012246A1 (de) 2000-03-09
CA2341264A1 (en) 2000-03-09
US6557617B1 (en) 2003-05-06

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