EP1120471A1 - Procédé et dispositif de coulée sous pression - Google Patents

Procédé et dispositif de coulée sous pression Download PDF

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Publication number
EP1120471A1
EP1120471A1 EP01100291A EP01100291A EP1120471A1 EP 1120471 A1 EP1120471 A1 EP 1120471A1 EP 01100291 A EP01100291 A EP 01100291A EP 01100291 A EP01100291 A EP 01100291A EP 1120471 A1 EP1120471 A1 EP 1120471A1
Authority
EP
European Patent Office
Prior art keywords
casting
casting chamber
chamber
suspension
melt
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Withdrawn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
EP01100291A
Other languages
German (de)
English (en)
Inventor
Evgueni Dr. Sterling
Gerhart Dr. Peleschka
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.)
Ritter Aluminium Giesserei GmbH
Original Assignee
Ritter Aluminium Giesserei GmbH
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 Ritter Aluminium Giesserei GmbH filed Critical Ritter Aluminium Giesserei GmbH
Publication of EP1120471A1 publication Critical patent/EP1120471A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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 invention relates to a die casting method for manufacturing of castings from a semi-solid alloy melt, wherein the alloy melt by stimulating the crystallization process put in the semi-rigid state is placed in a casting chamber and the castings under Pressure can be produced and a device for performing of the procedure.
  • thermodynamic state of the metal plays a crucial role in the various machining processes plays.
  • the associated effects can not only used to facilitate the deformation process , but you can essentially change the morphology of the occurring crystalline shapes and properties of the casting influence.
  • the temperature loses with increasing temperature Alloy their strength, what for the molding process is of fundamental importance, and at the same time wins the Ability to plastic form as structure-dependent Property.
  • Liquidus-Solidus is the alloy melt in the semi-solidified Status. This condition is therefore called “metallic Suspension "referred to as the primary material for new die casting processes is used.
  • the invention is concerned now with the phenomenological behavior of the crystallizing Liquids and their rheological properties and uses this for the production of castings from the semi-rigid Status. Thereby a predetermined melt volume before entering a casting chamber of a special treatment subjected, the method being designed so that the predosed metal without loss of quality in the die casting system can be entered.
  • a process for the production of castings from the semi-rigid The melt state is known from EP 0 841 406 A1. There a multi-stage process is described, the goal of which it is the parts from the semi-rigid alloys in one Vertical die casting machine.
  • the transportation of the Raw material into the casting chamber takes place after a nucleation phase in the overheated melt with subsequent granulation process.
  • a vibrating device was used for this, with the appearance of germs in the crystallizing Melt is stimulated.
  • the suspension state obtained in the process to get was the semi-rigid starting material heated in a controlled manner. After the casting chamber attached to the container was docked for the primary material, this was in the Press form pressed.
  • EP 0 733 421 A1 discloses a further casting process in that after a dosage of the predetermined melt volume The casting chamber is filled with a casting piston.
  • the default Melt volume is achieved through additional cooling and mixing in a suspension state in the electromagnetic field offset and then pressed into the die.
  • the quality of the melt volume can indeed be improved before pouring, but succeed it does not produce the quality you want over a long period of time to keep constant. Rather, it was found that gross structural excretions and associated low values of mechanical properties as a result of changes in the Crystallization conditions occur in the melt.
  • the inventors have now set themselves the task of improving Structural homogeneity - compared to that according to the status the products manufactured in technology - to achieve, where as Quality measure the amount of columnar crystals produced or transcrystallites and the amount of coaxial or globulitic crystals was used.
  • Quality measure the amount of columnar crystals produced or transcrystallites and the amount of coaxial or globulitic crystals was used.
  • the experimental Results showed that the improved isotropy of the castings by the type of crystalline occurred Forms can be documented and that in particular high Strengths and very good toughness behavior demonstrable are.
  • the present invention aims at a die casting method, through which a homogeneous suspension state of the primary material is reliably guaranteed. This primary material is then in this state filled into a pressure chamber under pressure. Another goal is that the primary material from a exogenous metallic suspension is generated.
  • the aforementioned tasks are carried out with a Process of the type mentioned solved in that the given melting volume outside the casting chamber in one closed processing container in rotation and a homogeneous metallic suspension of exogenous nature is generated from after filling in the casting chamber a casting is made.
  • the casting chamber remains on course of the procedure always in the docked state and the whole
  • the process which consists of individual work stages, is called closed casting system.
  • the processing container first with the specified melting volume fill, there a homogeneous metallic suspension to generate and use a special transport chamber to transport into the casting chamber, for which the vertically arranged casting chamber with a filling opening is.
  • a special distinguishing feature of the invention Process is the way in which the metallic Suspension is being prepared.
  • the predetermined melting volume is determined by a external cooling is placed in the suspension state, whereby the suspension has an endogenous character in the present invention a fundamentally different technological Approach chosen, after which suddenly an exogenous metallic suspension occurs.
  • the core of the approach is that fast and even melt cooling, which is only possible through the Introduction of additional micro heat processes into the given one Melt volume is possible.
  • a coolant is turned off made of the same alloy as the melting volume Powder used to get the necessary cooling effect in the shortest possible time
  • the cooling effect consists of one Decrease in excess superheat temperature, whereby two parallel crystallization processes take place:
  • the melt is from the inside to the predetermined temperature or at least cooled liquidus temperature and by the additional Cooling generates nuclei. This determine the structural morphology. Your even distribution in the resulting metallic suspension is of primary Importance to equal crystallization conditions in the to ensure the entire suspension volume.
  • the cooling powder is then under pressure in the melt introduced for which air, argon or nitrogen as a carrier gas is used.
  • This suspension area is characteristic of the whole Volume of material in the proposed process. From the beginning are those caused by the electromagnetic field on the molten metal Acting forces necessary for this in the narrow solidification area shear off the solidifying material and the whole To put suspension volume in such a motion where the suspension has its ability to flow over a maintains a longer period while maintaining the quality of the Casting desired homogeneity achieved.
  • the inventors have also succeeded in obtaining an experimental equation according to which the degree of homogeneity of metallic suspensions is determined by a coefficient of homogeneity (X), the lower efficient limit of which for aluminum alloys is 3.8 x 10 8 A 2 / sec.
  • X coefficient of homogeneity
  • the special design of the processing container allows the predetermined melting volume under constant technological To put conditions in a metallic suspension, the container as a homogeneous suspension precursor leaves through the outlet and then into the casting chamber flows in.
  • a particularly preferred embodiment of the invention is by a specially designed for the suspension transport Marked transport chamber. This connects the processing container and the casting chamber, is with a transport piston equipped and can either in the right or in the tip Angle can be attached to the vertically arranged casting chamber.
  • the transport piston fulfills two functions: The metallic suspension or its rest quickly into the Introduce the casting chamber and close it tightly after filling close.
  • the piston is designed to be frontal outline continues the inner outline of the casting chamber, so that there is no interference from the Side of the transport piston in the filling opening area.
  • a processing container 1 provided with a stuffing rod 2 and a pipe 3 for the introduction of cooling powder is equipped.
  • a fuse line 4 Container also with the holding oven 5 and through a Transport chamber 6 with the vertically arranged casting chamber 7 connected.
  • the processing container 1 is also in an electromagnetic Stirring device 8 used as an integrating System of induction and control unit in the form of a closed component of the die casting machine.
  • the transport chamber 6 is in the acute angle mounted on the casting chamber 7.
  • the casting chamber is aligned with a casting piston 11 as usual.
  • an electromagnetic Generated field that allows a stirring movement of the melt.
  • the melt 12 arrives by means of a melt line 4 from the holding furnace 5 into the processing container 1, the is located in the induction coil 8.
  • the rotating magnetic field becomes the predetermined melting volume set in motion in an enclosed space, because the outflow opening of the processing container is tight with the stuffing rod 2 is completed.
  • the melt flows to the container walls and forms one liquid hollow rotating body (according to the drawing the rotating body has a conical shape).
  • This creates on the free area of the rotating body a gravitational coefficient K whose value is determined by the speed at which the different liquid layers against each other move.
  • the cooling powder is put under pressure in the melt introduced, in pulsating regimes.
  • the exogenous metallic Suspension suddenly in the processing container 1 occurs is a result of three converging processes:
  • the first process is part of the heat exchange process, in which the powder material from the overheated melt the excess Removes heat. There are several cooled suspension areas, whose temperature is below the liquidus level.
  • the second process is related to the way in which the powder is introduced into the melt. There this process takes place under pressure, the powder particles remain not on the inner surface of the liquid rotating body, but penetrate deeply into the melt and act as an efficient internal heat consumer, creating an exogenous metallic Suspension simultaneously in the entire melting volume occurs. Because the powder pulsed into the melt elastic oscillations develop in the liquid metal, the occurrence through a microcavitation effect of new crystallization nuclei in the specified melting volume stimulate even more.
  • the processing container 1 After the homogeneity of the suspension is reached, the processing container 1 by pulling out the stuffing rod 2 emptied of the suspension from the transport chamber 6 is recorded.
  • the suspension can either be in rotation be moved or directly from the processing container 1 flow out, which has no influence on the suspension quality exercises, but affects the outflow time.
  • the metallic suspension produced in this way has great potential in kinetic energy, it flows very quickly towards the transport chamber 6 in the direction the casting chamber 7, which they through the provided filling opening 10th stuffed. This moves at the same time as the inflowing Suspension of the plunger 11 synchronously down to thereby enabling the increasing filling process.
  • the transport chamber 6 especially at high piston acceleration in front of the metallic suspension flowing in through the filling opening
  • the transport piston 9 is pushed forward and closes the filling opening 10 and thereby the casting chamber 7.
  • the transport piston 9 is designed so that its front Outline continues the inner outline of the casting chamber 7.
  • the metallic suspension in the casting chamber fills by means of piston acceleration the pressure chamber, so that a casting is made from the semi-rigid raw material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Extrusion Of Metal (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP01100291A 2000-01-24 2001-01-04 Procédé et dispositif de coulée sous pression Withdrawn EP1120471A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10002670 2000-01-24
DE10002670A DE10002670C2 (de) 2000-01-24 2000-01-24 Druckgießverfahren und Vorrichtung zu seiner Durchführung

Publications (1)

Publication Number Publication Date
EP1120471A1 true EP1120471A1 (fr) 2001-08-01

Family

ID=7628380

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01100291A Withdrawn EP1120471A1 (fr) 2000-01-24 2001-01-04 Procédé et dispositif de coulée sous pression

Country Status (7)

Country Link
US (1) US20020179280A1 (fr)
EP (1) EP1120471A1 (fr)
JP (1) JP2003520683A (fr)
KR (1) KR20010113858A (fr)
AU (1) AU3166101A (fr)
DE (1) DE10002670C2 (fr)
WO (1) WO2001055464A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004105979A2 (fr) 2003-06-03 2004-12-09 Dong Keun Go Machine a couler sous pression et procede de coulage effectue par cette machine

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10157349A1 (de) * 2001-11-22 2003-06-12 Demag Ergotech Gmbh Vorrichtung und Verfahren zum Giessen von metallischen Materialien
DE10212349C1 (de) * 2002-03-13 2003-08-28 Evgenij Sterling Verfahren und Vorrichtung zum Aufbereiten einer Schmelze einer Legierung für einen Giessvorgang
US6908590B2 (en) * 2002-03-19 2005-06-21 Spx Corporation Aluminum alloy
US20050103461A1 (en) * 2003-11-19 2005-05-19 Tht Presses, Inc. Process for generating a semi-solid slurry
KR100554093B1 (ko) * 2004-02-04 2006-02-22 주식회사 나노캐스트코리아 반응고 성형장치
DE102005021891B4 (de) 2005-05-04 2011-12-22 Evgenij Sterling Verfahren zum Herstellen von Masseln und Massel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6365015A (ja) * 1986-09-05 1988-03-23 Kubota Ltd 金属溶湯への脱酸剤添加方法
JPH02274345A (ja) * 1989-04-14 1990-11-08 Nippon Steel Corp 金属の鋳造方法
EP0733421A1 (fr) * 1995-03-22 1996-09-25 Hitachi Metals, Ltd. Procédé de coulage sous pression
JPH08290257A (ja) * 1995-04-20 1996-11-05 Mitsubishi Heavy Ind Ltd 耐摩耗性アルミニウム合金鋳物及びその製造法
EP0841406A1 (fr) * 1996-11-08 1998-05-13 Ube Industries, Ltd. Procédé pour mettre des métaux semi-solides en forme

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0859677B1 (fr) * 1995-12-12 2002-03-13 Thixomat, Inc. Appareil pour produire des pates metalliques thixotropes semi-solides
ATE213187T1 (de) * 1998-11-25 2002-02-15 Ritter Aluminium Giesserei Gmb Druckgiessverfahren zur herstellung von gussstücken aus legierungen mit thixotropen eigenschaften sowie vorrichtung zur duchführung des verfahrens
DE19918229C2 (de) * 1999-04-22 2002-07-18 Daimler Chrysler Ag Verfahren zum Herstellen von Rohlingen für Zylinderlaufbüchsen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6365015A (ja) * 1986-09-05 1988-03-23 Kubota Ltd 金属溶湯への脱酸剤添加方法
JPH02274345A (ja) * 1989-04-14 1990-11-08 Nippon Steel Corp 金属の鋳造方法
EP0733421A1 (fr) * 1995-03-22 1996-09-25 Hitachi Metals, Ltd. Procédé de coulage sous pression
JPH08290257A (ja) * 1995-04-20 1996-11-05 Mitsubishi Heavy Ind Ltd 耐摩耗性アルミニウム合金鋳物及びその製造法
EP0841406A1 (fr) * 1996-11-08 1998-05-13 Ube Industries, Ltd. Procédé pour mettre des métaux semi-solides en forme

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 297 (C - 519) 12 August 1988 (1988-08-12) *
PATENT ABSTRACTS OF JAPAN vol. 015, no. 032 (M - 1073) 25 January 1991 (1991-01-25) *
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 03 31 March 1997 (1997-03-31) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004105979A2 (fr) 2003-06-03 2004-12-09 Dong Keun Go Machine a couler sous pression et procede de coulage effectue par cette machine
EP1663547A2 (fr) * 2003-06-03 2006-06-07 Dong Keun Go Machine a couler sous pression et procede de coulage effectue par cette machine
EP1663547A4 (fr) * 2003-06-03 2008-05-21 Dong Keun Go Machine a couler sous pression et procede de coulage effectue par cette machine
EP2340903A3 (fr) * 2003-06-03 2012-01-18 Dong Keun Go Machine de coulage et procédé de coulage pour cette machine

Also Published As

Publication number Publication date
DE10002670A1 (de) 2001-08-02
JP2003520683A (ja) 2003-07-08
DE10002670C2 (de) 2003-03-20
WO2001055464A1 (fr) 2001-08-02
AU3166101A (en) 2001-08-07
KR20010113858A (ko) 2001-12-28
US20020179280A1 (en) 2002-12-05

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