Global Patent Index - EP 1004374 A1

EP 1004374 A1 2000-05-31 - Die casting method to produce alloy castings with thixotropy characteristics

Title (en)

Die casting method to produce alloy castings with thixotropy characteristics

Title (de)

Druckgiessverfahren zur Herstellung von Gussstücken aus Legierungen mit thixotropen Eigenschaften

Title (fr)

Procédé de coulée sous pression pour la fabrication de pièces coulées en alliages avec propriétés Thixotropes

Publication

EP 1004374 A1 (DE)

Application

EP 98122335 A

Priority

EP 98122335 A

Abstract (en)

Thixotropic alloy die casting process, employs a processing chamber (4) equipped with a dosing piston (7) between a melt container (1) and a casting chamber (5). A thixotropic alloy die casting process comprises dosing a predetermined melt volume to a casting chamber (5) with a casting piston (8) and a casting die (14), granulating the primary crystals formed in the melt and subjecting the melt volume to cooling, mixing in an electromagnetic field (10) and injection in a semi-solidified state. During dosing, the casting chamber remains docked to the die and dosing is carried out by filling a processing chamber (4) connected by a melt feed line (2) and a casting passage (3) with a melt container (1) and the casting chamber through a casting passage (6) and which is provided with a dosing piston (7).

Abstract (de)

Es wird ein Verfahren zur Herstellung von Gußstücken aus Legierungen mit thixotropen Eigenschaften beschrieben, bei welchem ein geschlossenes Schmelzevolumen bis zum Zustand einer homogenen metallischen Suspension (13) mit granulierten Primärkristallen in einer Bearbeitungskammer (4) vorbereitet wird, die mittels einer Schmelzeleitung (2) und eines Gießganges (3) mit einem Schmelzbehälter (1) und einer Gießkammer (5) durch einen Gießgang (6) entsprechend verbunden und mit einem Dosierkolben (7) versehen ist. Um während des Dosiervorgangs keine größeren Luftmengen in die Gießkammer (5) einzubringen, ist die Druckgießform (14) während der Schmelzedosierung nicht von der Gießkammer (5) abgedockt und die metallische Suspension (13) wird in diese Kammer (5) nur durch eine entsprechende Bewegung des Dosierkolbens (7) gefördert. Um eine Suspensionshomogenität zu erhalten sowie die Eigenschaftsisotropie des Gußstückes sicherzustellen, wird die metallische Suspension (13) sowohl in der Bearbeitungs- (4) wie auch der Gießkammer (5) gerührt. Die Füllung der Form (14) erfolgt durch den Gießkolben (8), wobei die Suspension (13) - während der Füllung und des Einpressens - im elektromagnetischen Feld (10) rotiert wird. <IMAGE>

IPC 1-7 (main, further and additional classification)

B22D 17/30; B22D 17/12

IPC 8 full level (invention and additional information)

B22D 17/00 (2006.01); B22D 17/12 (2006.01); B22D 17/30 (2006.01)

CPC (invention and additional information)

B22D 17/12 (2013.01); B22D 17/007 (2013.01); B22D 17/30 (2013.01)

Citation (search report)

[X] WO 9721509 A1 19970619 - THIXOMAT INC [US]

Designated contracting state (EPC)

AT CH DE ES FR IT LI NL

EPO simple patent family

EP 1004374 A1 20000531; EP 1004374 B1 20020213; AT 213187 T 20020215; CN 1256982 A 20000621; DE 59803079 D1 20020321; JP 2000158118 A 20000613; JP 3125878 B2 20010122; KR 20000035226 A 20000626

INPADOC legal status


2006-06-01 [PG25 DE] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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2005-07-15 [REG CH PL] PATENT CEASED

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2003-09-30 [REG CH AEN] MODIFICATION OF THE SCOPE OF THE PATENT

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2003-07-15 [REG CH PL] PATENT CEASED

2003-02-05 [26N] NO OPPOSITION FILED

- Effective date: 20021114

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2002-11-22 [EN] FR: TRANSLATION NOT FILED

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2002-07-01 [NLV1] NL: LAPSED OR ANNULLED DUE TO FAILURE TO FULFILL THE REQUIREMENTS OF ART. 29P AND 29M OF THE PATENTS ACT

2002-03-21 [REF] CORRESPONDS TO:

- Document: DE 59803079 20020321

2002-02-15 [REG CH EP] ENTRY IN THE NATIONAL PHASE

2002-02-13 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: B1

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2002-02-13 [PG25 FR] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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2002-02-13 [REF] CORRESPONDS TO:

- Document: AT 213187 T 20020215

2001-07-11 [RIN1] INVENTOR (CORRECTION)

- Inventor name: STERLING, EVGUENI DR.-ING.

2001-07-11 [RIN1] INVENTOR (CORRECTION)

- Inventor name: PELESCHKA, GERHARD DR.DIPL.-KFM.

2001-03-14 [RTI1] TITLE (CORRECTION)

- Free text: DIE CASTING METHOD AND APPARATUS TO PRODUCE ALLOY CASTINGS WITH THIXOTROPIC CHARACTERISTICS

2001-02-07 [AKX] PAYMENT OF DESIGNATION FEES

- Free text: AT CH DE ES FR IT LI NL

2000-09-27 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20000809

2000-08-23 [RAP3] CORRECTION OF THE ADDRESS OR NAME OF APPLICANT (A DOCUMENT)

- Owner name: RITTER ALUMINIUM GIESSEREI GMBH

2000-05-31 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000310

2000-05-31 [AK] DESIGNATED CONTRACTING STATES:

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2000-05-31 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

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