EP0733422A1 - Procédé et dispositif pour la fabrication des articles métalliques moulés - Google Patents

Procédé et dispositif pour la fabrication des articles métalliques moulés Download PDF

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Publication number
EP0733422A1
EP0733422A1 EP96810144A EP96810144A EP0733422A1 EP 0733422 A1 EP0733422 A1 EP 0733422A1 EP 96810144 A EP96810144 A EP 96810144A EP 96810144 A EP96810144 A EP 96810144A EP 0733422 A1 EP0733422 A1 EP 0733422A1
Authority
EP
European Patent Office
Prior art keywords
mold cavity
metal
filling chamber
thixoforming
mold
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.)
Granted
Application number
EP96810144A
Other languages
German (de)
English (en)
Other versions
EP0733422B1 (fr
Inventor
Hans Thurner
Jean-Pierre Gabathuler
Erich Röllin
Hansjörg Huber
Helmut Schelling
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
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 filed Critical Alusuisse Lonza Services Ltd
Publication of EP0733422A1 publication Critical patent/EP0733422A1/fr
Application granted granted Critical
Publication of EP0733422B1 publication Critical patent/EP0733422B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B22D17/007—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
    • B22D17/14—Machines with evacuated die cavity

Definitions

  • the invention relates to a method for producing molded parts from metal by pressing a thixotropic metal bolt with a piston from a filling chamber into a mold cavity.
  • a thixoforming plant suitable for carrying out the method according to the invention.
  • thixoforms The process for the production of molded parts from thixotropic, i.e. partially solid / partially liquid, metal bolts is referred to as thixoforms. All bolts made of a metal which can be converted into a thixotropic state are suitable as metal bolts.
  • the metal bolts can consist of aluminum, magnesium or zinc and their alloys.
  • the thixoforming of thixotropic metal alloys is known per se. This process uses the thixotropic properties of partially liquid or partially solid metal alloys.
  • the thixotropic behavior of a metal alloy is understood to mean that a correspondingly prepared metal behaves unloaded like a solid, but reduces its viscosity under shear stress to such an extent that it behaves similarly to a metal melt. This requires heating the alloy in the solidification interval between the liquidus and solidus temperature. The temperature is to be set so that, for example, a microstructure content of 20 to 80% by weight is melted, but the rest remains in solid form.
  • partially solid / partially liquid metal in the form of a thixotropic metal bolt is placed in a filling chamber which is usually arranged horizontally and is introduced or shot into a mold cavity in which the thixotropic metal alloy solidifies by means of pressure by means of a piston.
  • the mold filling with the partially solid / partially liquid metal takes place in thixoforming as a largely laminar flow.
  • the metal forms a closed metal front that pushes the air in front of it in the direction of the ventilation ducts.
  • the air can escape through these channels.
  • the ventilation ducts can also at least partially become clogged with separating agent over time. This leads to increased gas pressures in front of the metal front and thus to an increased gas absorption in the molded part.
  • the gas porosity in the molded parts can vary.
  • the inventors have set themselves the task of creating a method of the type mentioned at the outset with which the gas porosity in the molded parts can be reduced further. Furthermore, a thixoforming plant suitable for carrying out the method is to be provided.
  • the mold cavity is forcibly vented at least until the metal enters the mold cavity.
  • molded parts can be produced by thixoforming which have a further reduced gas porosity compared to molded parts which are produced according to the prior art.
  • the gas content in thixoforming parts is generally already at a very low level and therefore there should be no problems with porosity. Nevertheless, with certain parts and with very high quality requirements, the gas content in certain molded part areas can be too high.
  • One reason for a locally increased gas porosity is, for example, that in the case of thin-walled parts, the filling speed must be chosen so high that the metal front is no longer compact.
  • the filling chamber is designed to be heat-insulating and / or it is heated.
  • the piston speed can be increased after the time of the entry of the metal into the mold cavity and thus the mold filling can be accelerated, which enables the production of thin-walled parts.
  • a thixoforming installation suitable for carrying out the method according to the invention has a filling chamber for receiving a thixotropic metal bolt, a mold cavity adjoining the filling chamber and a piston for pressing the metal bolt out of the filling chamber into the mold cavity.
  • the mold cavity is connected to a vacuum container.
  • An actuating element for opening and closing the connection between the mold cavity and the vacuum container is expediently arranged between the mold cavity and the vacuum container.
  • the actuator has a control bolt with a closure head, the closure head being used to open and close a ventilation channel directly adjoining the mold cavity.
  • the filling chamber can consist of a ceramic material, in particular of Si 3 N 4 . It is also possible to provide the filling chamber with heating devices. These heating devices can be arranged in the wall of the filling chamber, for example as heating rods or as bores in which a heated medium such as oil flows.
  • a thixoforming system 10 shown in FIG. 1 has a horizontally lying cylindrical filling chamber 12 with a filling chamber cavity 14.
  • An opening 18 in the filling chamber 12 serves to introduce a thixotropic metal bolt 20 into the filling chamber cavity 14.
  • the metal bolt 20 is displaced within the filling chamber cavity 14 by means of a piston 16 which is arranged in the filling chamber 12 and can be moved in the direction of the filling chamber axis x.
  • the filling chamber 12 ends in a fixed mold plate 22, which is opposite a movable mold plate 24.
  • the two mold plates 22, 24 each receive a mold half 26, 28 which, when closed, form a mold cavity 30 in which the molded part 32 is formed after the metal has solidified.
  • the mold cavity 30 has one or more ventilation channels 34, which may be combined to form a collecting channel.
  • a control insert 36 with a control pin 38 is arranged in the movable mold plate 24.
  • the control pin 38 has a closure head 40 for opening or closing the ventilation channel 34.
  • the control bolt 38 is displaced via an actuating cylinder 42 flanged on the outside of the movable mold plate 24. With this arrangement, the forced ventilation can be maintained until the mold is completely filled. Only when the mold has been filled is the venting channel 34 at the end of the mold cavity 30 closed via the closure head 40 of the control bolt 38.
  • a vacuum line 44 connects to the control insert 36 and is connected to a vacuum container 48 via a valve 46.
  • the vacuum container 48 is evacuated with a vacuum pump 50 and kept at negative pressure.
  • Pressure gauges 52 are provided for pressure control.
  • the forced venting begins at the earliest when the piston 16 has closed the opening 18 in the filling chamber 12 and ends at the latest when the tool is opened again by separating the mold halves 26, 28.
  • the forced venting ends as soon as the mold filling is complete, ie the piston 16 no longer moves.
  • Forced ventilation can of course also end earlier.
  • the switch-on and switch-off points for the forced ventilation can be determined by means of displacement transducers arranged on the piston rod. Switching on and off can also be time, speed or pressure controlled. Another possibility is the use of metal front sensors, which trigger a circuit when the metal front reaches a certain point.
  • the piston leads the metal to the gate, during a second filling phase, which begins at the time t E of the entry of the metal into the mold cavity, the mold cavity is filled with metal.
  • the two filling phases are of approximately the same length and are, for example, 0.5 seconds each.
  • the evacuation time is therefore less than 1 second.
  • the gases can only be suctioned off when the piston has closed the filling opening.
  • the speed of the piston cannot be reduced arbitrarily, since otherwise too much metal would solidify in the filling chamber.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Chemically Coating (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Powder Metallurgy (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP96810144A 1995-03-21 1996-03-08 Procédé pour la fabrication des articles métalliques moulés Expired - Lifetime EP0733422B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH00797/95A CH689448A5 (de) 1995-03-21 1995-03-21 Verfahren und Vorrichtung zur Herstellung von Formteilen aus Metall.
CH79795 1995-03-21
CH797/95 1995-03-21

Publications (2)

Publication Number Publication Date
EP0733422A1 true EP0733422A1 (fr) 1996-09-25
EP0733422B1 EP0733422B1 (fr) 2000-02-09

Family

ID=4195412

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96810144A Expired - Lifetime EP0733422B1 (fr) 1995-03-21 1996-03-08 Procédé pour la fabrication des articles métalliques moulés

Country Status (11)

Country Link
EP (1) EP0733422B1 (fr)
JP (1) JPH08257729A (fr)
AT (1) ATE189634T1 (fr)
CA (1) CA2170714A1 (fr)
CH (1) CH689448A5 (fr)
DE (1) DE59604390D1 (fr)
DK (1) DK0733422T3 (fr)
ES (1) ES2143743T3 (fr)
GR (1) GR3033176T3 (fr)
NO (1) NO312182B1 (fr)
PT (1) PT733422E (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10022560A1 (de) * 2000-05-10 2001-11-15 Fuchs Lubritech Gmbh Druckgießmaschine
DE10144945A1 (de) * 2001-09-12 2003-04-10 Alcan Bdw Gmbh & Co Kg Verfahren zum Steuern eines Vakuumventils einer Vakuumdruckgießvorrichtung sowie Vakuumdruckgießvorrichtung
DE102009033532A1 (de) * 2009-07-10 2011-01-20 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Extruder zur Herstellung eines Bauteils aus Leichtmetall

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10043717A1 (de) * 2000-09-04 2002-03-14 Buehler Druckguss Ag Uzwil Verfahren und Vorrichtung zum Druckumformen von metallischen Werkstoffen
JP5556108B2 (ja) * 2009-09-25 2014-07-23 トヨタ自動車株式会社 半溶融金属の鋳造方法、及び半溶融金属の鋳造装置
CN104259430B (zh) * 2014-10-21 2016-03-30 湖南航天诚远精密机械有限公司 金属及其合金真空压铸成形装备及方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0005239A1 (fr) * 1978-04-27 1979-11-14 Leibfried, Dieter Procédé de moulage sous basse pression pour métaux, notamment métaux non-ferreux, ainsi que l'installation pour la réalisation de ce procédé
EP0489503A1 (fr) * 1990-11-30 1992-06-10 Micromatic Operations, Inc. Procédé et dispositif pour la fabrication des pièces façonnées à partir d'une préforme semi-solide du métal
WO1992013662A1 (fr) * 1991-01-30 1992-08-20 Transvalor S.A. Procede de moulage d'un lingot d'alliage a structure dendritique fine et machine de moulage suivant ce procede
EP0513523A1 (fr) * 1991-04-19 1992-11-19 MAGNETI MARELLI S.p.A. Procédé pour le moulage par injection d'articles avec un excellent fonctionnement mécanique, d'un métal à l'état de mélange liquide-solide

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0005239A1 (fr) * 1978-04-27 1979-11-14 Leibfried, Dieter Procédé de moulage sous basse pression pour métaux, notamment métaux non-ferreux, ainsi que l'installation pour la réalisation de ce procédé
EP0489503A1 (fr) * 1990-11-30 1992-06-10 Micromatic Operations, Inc. Procédé et dispositif pour la fabrication des pièces façonnées à partir d'une préforme semi-solide du métal
WO1992013662A1 (fr) * 1991-01-30 1992-08-20 Transvalor S.A. Procede de moulage d'un lingot d'alliage a structure dendritique fine et machine de moulage suivant ce procede
EP0513523A1 (fr) * 1991-04-19 1992-11-19 MAGNETI MARELLI S.p.A. Procédé pour le moulage par injection d'articles avec un excellent fonctionnement mécanique, d'un métal à l'état de mélange liquide-solide

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10022560A1 (de) * 2000-05-10 2001-11-15 Fuchs Lubritech Gmbh Druckgießmaschine
DE10144945A1 (de) * 2001-09-12 2003-04-10 Alcan Bdw Gmbh & Co Kg Verfahren zum Steuern eines Vakuumventils einer Vakuumdruckgießvorrichtung sowie Vakuumdruckgießvorrichtung
DE10144945B4 (de) * 2001-09-12 2005-05-04 Alcan Bdw Gmbh & Co. Kg Verfahren zum Steuern eines Vakuumventils einer Vakuumdruckgießvorrichtung sowie Vakuumdruckgießvorrichtung
US6948549B2 (en) 2001-09-12 2005-09-27 Alcan Bdw Gmbh & Co. Kg Method for controlling a vacuum valve of a vacuum die casting device and a vacuum die casting device
DE102009033532A1 (de) * 2009-07-10 2011-01-20 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Extruder zur Herstellung eines Bauteils aus Leichtmetall
DE102009033532B4 (de) * 2009-07-10 2020-11-19 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Extruder zur Herstellung eines Bauteils aus Leichtmetall

Also Published As

Publication number Publication date
ES2143743T3 (es) 2000-05-16
EP0733422B1 (fr) 2000-02-09
CA2170714A1 (fr) 1996-09-22
GR3033176T3 (en) 2000-08-31
ATE189634T1 (de) 2000-02-15
DE59604390D1 (de) 2000-03-16
NO961110D0 (no) 1996-03-19
NO312182B1 (no) 2002-04-08
CH689448A5 (de) 1999-04-30
DK0733422T3 (da) 2000-07-24
PT733422E (pt) 2000-06-30
JPH08257729A (ja) 1996-10-08
NO961110L (no) 1996-09-23

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