EP0577632A1 - Procede de coulee de metaux et dispositif de mise en uvre d'un tel procede. - Google Patents

Procede de coulee de metaux et dispositif de mise en uvre d'un tel procede.

Info

Publication number
EP0577632A1
EP0577632A1 EP92906424A EP92906424A EP0577632A1 EP 0577632 A1 EP0577632 A1 EP 0577632A1 EP 92906424 A EP92906424 A EP 92906424A EP 92906424 A EP92906424 A EP 92906424A EP 0577632 A1 EP0577632 A1 EP 0577632A1
Authority
EP
European Patent Office
Prior art keywords
casting
section
mold
channel
pouring
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
EP92906424A
Other languages
German (de)
English (en)
Other versions
EP0577632B1 (fr
Inventor
Peter Srostlik
Alfred Walter
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.)
Bachmann Giesserei und Formenbau GmbH and Co KG
Original Assignee
Bachmann Giesserei und Formenbau GmbH and Co KG
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 Bachmann Giesserei und Formenbau GmbH and Co KG filed Critical Bachmann Giesserei und Formenbau GmbH and Co KG
Publication of EP0577632A1 publication Critical patent/EP0577632A1/fr
Application granted granted Critical
Publication of EP0577632B1 publication Critical patent/EP0577632B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B22D17/08—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled
    • B22D17/12—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled with vertical press motion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/02—Pressure casting making use of mechanical pressure devices, e.g. cast-forging

Definitions

  • the invention relates to a method for casting metals, in particular alloys with a low melting point, in which the liquid metal is poured into a mold from bottom to top via a pouring channel and a pouring opening arranged at the lowest point of the mold , and a device for carrying out such a method.
  • the object of the invention is therefore to develop a method or a device with which a casting can be produced without a sprue or sprue and can be used directly without reworking.
  • this object is essentially achieved in that, after the casting mold has been completely filled and only partially solidified the metal in the casting mold, the casting pressure is reduced or switched off, so that a backflow of liquid metal from the casting mold via a return ⁇ flow channel, the cross section of which is substantially smaller than the cross section of the pouring channel, and that a stamp, the end face of which corresponds to the size and shape of the outer contour of the casting in the region of the pouring opening, at least over the last section of the pouring channel with displacement of this section existing liquid metal in the casting mold is adjusted so far in the direction of the inside of the casting mold until the end face of the stamp is aligned with the inner contour of the casting mold.
  • the core Due to the adaptation of the end face of the stamp to the desired outer contour of the core in the region of the pouring opening, the core is now in a completely closed casting mold and solidifies without forming a pouring spigot to be reworked.
  • the plunger displaces liquid material, which would not be possible with conventional methods, since the mold is completely filled with liquid metal without air pockets. Due to the backflow of the liquid metal according to the invention from the casting mold after reducing or switching off the casting pressure, however, a cavity is created in the casting mold, into which the stamp can push liquid metal when the pouring opening is closed.
  • the control of the reflux quantity is achieved in that the cross section of the reflux channel is considerably smaller than the cross section of the pouring channel. This ensures that until the gate is closed by the plunger, not too much liquid metal has flowed back and the cavity inside the casting mold does not become too large.
  • the stamp closes the pouring channel when the metal is pressed into the casting mold before the end face of the stamp is aligned with the inner contour of the casting mold. This ensures that the metal displaced by the punch is pressed securely into the casting mold and is not partially removed via the casting channel, which would prevent a defined filling of the cavity in the casting mold.
  • the volume of the metal flowing back from the casting mold is greater than or equal to the volume V ⁇ of the metal displaced from the stamp into the interior of the casting mold is.
  • a residual cavity which may always remain in the area of still liquid metal inside the casting mold, is kept very small by the method according to the invention and in no way limits the use of the casting. Defined conditions for the backflow of the liquid metal and the closing of the pouring opening are expediently achieved in that the stamp is adjusted by means of freely definable time control.
  • the period of time for filling the casting mold via the pouring channel with metal is preferably approximately 20 seconds, the period of time from the end of filling the casting mold with metal to reducing or switching off the casting pressure is approximately 40 seconds and the entire period of time from the beginning of Pour the casting aisle until the gate is closed by the stamp for approx. 80 seconds. It has been found that if these standard times are observed, the cavity remaining in the casting mold can be kept very small or, in the ideal case, can even be avoided entirely.
  • the invention is also directed to a device for carrying out the above method, which is characterized in that a check valve opening in the casting direction is arranged in the pouring channel outside the section covered by the stamp, and that a check valve bridging the check valve is arranged.
  • the bypass duct for the check valve is provided in the pouring duct, the cross section of the return duct being substantially smaller than the cross section of the pouring duct.
  • the check valve prevents the backflow of the liquid metal through the pouring channel after the casting pressure has been switched off, so that only a relatively small proportion of the liquid metal can flow back through the backflow channel bypassing the check valve.
  • the ratio of the cross section of the return flow channel to the cross section of the pouring channel is in the order of 1:10 to 1:50.
  • This cross section of the return flow channel can preferably be changed, for example by means of an adjusting screw, in order, if necessary, to be adapted to different conditions when casting different alloys.
  • the solution according to the invention is characterized in that the pouring channel has a last section, seen in the filling direction, opening into the pouring opening, which runs coaxially with the punch and its direction of displacement, and that there is a laterally angled inlet section on the last section of the pouring channel , in which the check valve is arranged.
  • the stamp is preferably guided in a bore of the casting mold, which runs coaxially to the last section of the casting channel, so that the stamp is fed exactly onto the pouring opening of the casting mold.
  • the stamp Since the end face of the stamp is adapted to the desired outer contour of the casting, which may not be rotationally symmetrical, the stamp is preferably guided in the bore so that it cannot rotate.
  • the necessary forces for moving the liquid metal are applied according to the invention in that the plunger can be driven hydraulically.
  • the closing of the pouring channel after the pouring pressure has been switched off is ensured in that the check valve is pressed against a valve seat by a return spring.
  • the metal in the pouring channel must be kept liquid so as not to impede the stamp when closing the pouring opening.
  • the temperature in the pouring channel must therefore be greater than or equal to the melting temperature of the alloy to be cast, while the temperature of the casting mold in which the casting is to solidify must be lower. It is therefore provided in a development of the invention that a substantial part of the pouring channel and the stamp are arranged in a housing which is detachably connected to the casting mold with the interposition of a thermal barrier. This reduces the temperature loss from the housing to the mold.
  • the single figure shows a schematic representation of a casting device according to the invention.
  • Liquid metal in particular an alloy with a low melting point, is poured from bottom to top into a casting mold 3 consisting of two mold halves 1, 2 via a pouring channel 4 and a pouring opening 5 arranged at the lowest point of the casting mold 3.
  • the liquid metal is pressed under pressure into the casting mold 3, the air contained in the casting mold 3 escaping through the gap 6 existing between the mold halves 1, 2.
  • the gap 6 is too small for the liquid metal to flow through it could. In this way it is ensured that no unwanted attachment occurs in the parting plane of the casting mold 3.
  • the metal contained in the casting mold 3 begins to solidify, progressing inwards beginning at the outer edges of the casting 7.
  • the lines 8, 9 in the drawing each mean lines of the same solidification.
  • the casting pressure is switched off.
  • liquid metal flows out of the casting mold 3 under the action of gravity.
  • the backflow of the liquid metal through the pouring channel 4 is prevented, however, by arranging in the pouring channel 4 a check valve 10 opening in the pouring direction, the valve body 24 of which is pressed by a return spring 11 against a valve seat 12 and thereby the pouring channel 4 is ver ⁇ in the absence of casting pressure closes.
  • the return flow of the liquid metal can therefore only take place via a return flow passage 13, which bypasses the check valve 10 and acts as a bypass passage, the cross section of which is considerably smaller than the cross section of the pouring passage 4.
  • the ratio of the cross section of the return flow passage 13 to the cross section of the Pouring channel 4 in the order of 1:10 to 1:50.
  • the cross section of the return flow channel 13 is, for example Can be changed by means of an adjusting screw 14, in order, if necessary, to be able to make adjustments to different alloys and casting volumes.
  • the pouring channel 4 is divided into a last section 16 opening into the pouring opening 5 and a laterally angled inlet section 17, in which the check valve 10 is arranged.
  • a ram 18 can be displaced coaxially with the last section 16 of the casting channel 4 and is guided in a bore 19 of the casting mold 3 which runs coaxially with the last section 16 of the casting channel 4.
  • the end face 20 of the stamp 18 corresponds to the size and shape of the contour of the casting 7 in the region of the gate opening 5. Since this contour of the casting 7 is generally not rotationally symmetrical, the stamp 18 is guided in the bore 19 in a rotationally secure manner.
  • part of the liquid metal flows back from the casting mold 3 into the casting channel 4, as a result of which a cavity 15 is formed in the casting 7.
  • the metal flows back very slowly due to the small cross section of the return flow channel 13, so that the size of the resulting cavity 15 can be precisely determined by time control.
  • the die 18 is pushed forward, the liquid metal present in the last section 16 of the pouring channel 4 is pressed back into the casting mold 3.
  • the amount of metal that has flowed back and thus the volume of the cavity 15 that is formed can be precisely matched to that of the metal that is pressed back into the casting mold 3 by the stamp 18, so that the cavity 15 is completely or at least almost completely filled again.
  • the end face 20 of the stamp 18 corresponds in size and shape to the outer contour of the casting 7 in the region of the pouring opening 5, so that the inner contour of the completely closed casting mold 3 after the pouring opening 5 has been closed by the stamp 18 corresponds exactly to the desired outer contour of the casting 7 corresponds.
  • a sprue or sprue therefore does not form, so that the casting 7 can be used after removal from the mold 3 without further processing.
  • the stamp 18 is driven by a hydraulic drive 21.
  • An essential part of the pouring channel 4 and the stamp 18 are arranged in a heatable housing 22, which is detachably connected to the casting mold 3 with the interposition of a thermal barrier 23.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Devices For Molds (AREA)

Abstract

Selon un procédé de coulée de métaux, notamment d'alliages à bas point de fusion, le moule (3) est rempli de bas en haut avec du métal liquide, par un canal de coulée (4) et par un bec de coulée (5) agencé au point le plus profond du moule de coulée (3). Afin de pouvoir utiliser directement la pièce coulée (7), qui est dépourvue de carotte devant être ultérieurement traitée, la pression de coulée est réduite ou coupée une fois que le moule (3) est rempli et que le métal dans le moule (3) est partiellement solidifié, de sorte que le métal dans le moule ne peut refluer que par un canal de reflux (13) dont la section transversale est nettement inférieure à la section transversale du canal de coulée (4). Un piston dont la face frontale (20) a des dimensions et des formes correspondant au contour extérieur de la pièce coulée (7) dans la zone du bec de coulée (5), pénètre dans le moule à travers au moins la dernière section (16) du canal de coulée (4) et repousse le métal liquide contenu dans ladite section dans le moule (3) jusqu'à ce que la face frontale (20) du piston (18) affleure lecontour intérieur du moule de coulée (3). L'invention concerne également un dispositif de mise en oeuvre du procédé.
EP92906424A 1991-03-26 1992-03-12 Procede de coulee de metaux et dispositif de mise en uvre d'un tel procede Expired - Lifetime EP0577632B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4109793A DE4109793A1 (de) 1991-03-26 1991-03-26 Verfahren zum giessen von metallen sowie vorrichtung zur durchfuehrung eines solchen verfahrens
DE4109793 1991-03-26
PCT/EP1992/000547 WO1992017296A1 (fr) 1991-03-26 1992-03-12 Procede de coulee de metaux et dispositif de mise en ×uvre d'un tel procede

Publications (2)

Publication Number Publication Date
EP0577632A1 true EP0577632A1 (fr) 1994-01-12
EP0577632B1 EP0577632B1 (fr) 1995-06-07

Family

ID=6428164

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92906424A Expired - Lifetime EP0577632B1 (fr) 1991-03-26 1992-03-12 Procede de coulee de metaux et dispositif de mise en uvre d'un tel procede

Country Status (6)

Country Link
US (1) US5447188A (fr)
EP (1) EP0577632B1 (fr)
CA (1) CA2106075A1 (fr)
DE (2) DE4109793A1 (fr)
ES (1) ES2074882T3 (fr)
WO (1) WO1992017296A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9501263D0 (en) * 1995-01-23 1995-03-15 Snowden Pte Ltd A door assembly
DE10017393B4 (de) * 2000-04-07 2008-04-30 Volkswagen Ag Verfahren zur Herstellung von Druckgußkörpern sowie Dauerform
WO2002090020A1 (fr) * 2001-05-04 2002-11-14 Alcast S.R.L. Procede et dispositif destines a former rapidement et economiquement au moins un produit moule sous pression sans gaspillage de matiere de moulage
ITMI20020223A1 (it) * 2002-02-07 2003-08-07 Claudio Frulla Apparecchiatura per la realizzazione di oggetti in alluminio leghe dialluminio leghe leggere e simili
EP3175938B1 (fr) * 2015-12-02 2020-09-30 KWS South Wales Limited Procédé de coulage à température contrôlée
GB2531663B (en) 2015-12-02 2017-02-08 Kws South Wales Ltd Temperature controlled casting process

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US969539A (en) * 1908-06-16 1910-09-06 Compressed Metal Company Casting apparatus.
DE597704C (de) * 1932-04-08 1934-05-29 Josef Polak Verfahren und Vorrichtung zum Betrieb von Pressgussmaschinen
DE2855200C2 (de) * 1978-12-21 1982-05-27 Owens-Illinois, Inc., 43666 Toledo, Ohio Spritzvorrichtung zum Herstellen von Gegenständen aus thermoplastischem Kunststoff
JPS55106668A (en) * 1979-02-06 1980-08-15 Hitachi Metals Ltd Method and apparatus for constant rate feeding of molten metal
JPS58125358A (ja) * 1982-01-20 1983-07-26 Hitachi Ltd 溶湯鍛造装置
DE3528691A1 (de) * 1985-08-09 1987-02-12 Interatom Verfahren und vorrichtung zum druckgiessen von fluessigmetall
JPS63194864A (ja) * 1987-02-06 1988-08-12 Meichiyuu Seiki Kk 溶融金属注湯方法
US4991641A (en) * 1990-05-07 1991-02-12 Electrovert Ltd. Method of and apparatus for metal casting
US5109914A (en) * 1990-09-04 1992-05-05 Electrovert Ltd. Injection nozzle for casting metal alloys with low melting temperatures

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9217296A1 *

Also Published As

Publication number Publication date
ES2074882T3 (es) 1995-09-16
DE59202464D1 (de) 1995-07-13
WO1992017296A1 (fr) 1992-10-15
DE4109793A1 (de) 1992-10-01
EP0577632B1 (fr) 1995-06-07
US5447188A (en) 1995-09-05
CA2106075A1 (fr) 1992-09-27

Similar Documents

Publication Publication Date Title
DE69832538T2 (de) Magnesiumdruckguss
DE69211398T2 (de) Metallspritzgiessvorrichtung mit geheizter Zuleitung und geteilter Form
DE69311336T2 (de) Durch Gas unterstütztes Spritzgiessen
DE2953474C2 (de) Druckgießverfahren mit Nachverdichtung
CH654768A5 (de) Entgasungsvorrichtung an einer druck- oder spritzgiessform.
DE7834444U1 (de) Druckgussmaschine
DE1249464B (de) Druckgießverfahren und Druckgießmaschine
DE69812502T2 (de) Giesskammer für eine Druckgiessmaschine und ein Verfahren zum Entfernen von Verunreinigungen
EP2855051A1 (fr) Dispositif de transport pour un bain de métal fondu dans une unité d'injection sous pression
DE3605529C3 (de) Druckgießverfahren und Druckgießmaschine
DE10133672B4 (de) Verfahren zum Spritzgießen metallischer Materialien
DE19606806C2 (de) Vorrichtung zum Thixoforming
EP0577632A1 (fr) Procede de coulee de metaux et dispositif de mise en uvre d'un tel procede.
DE112010004915B4 (de) Druckguss-Giessvorrichtung und Druckguss-Giessverfahren.
DE3831938A1 (de) Giessvorrichtung
DE3923760A1 (de) Verdichtervorrichtung fuer eine druckgiessmaschine
EP0231520B1 (fr) Procédé et dispositif pour le raccordement d'un nouveau lingot continu dans une installation de coulée continue
EP0894557B2 (fr) Procédé de moulage de pièces coulées et moule utilisant un tel procédé
DE2457423C2 (de) Verfahren und Vorrichtung zum Herstellen eines Stranges aus einer metallischen Schmelze
EP3511090B1 (fr) Machine de coulée sous pression à chambre froide
DE10064300C1 (de) Gießform mit verbessertem Gießlauf
DE69108306T2 (de) Verfahren, Giessform und Vorrichtung zum mehrstufigen Niederdruckgiessen von Metall.
DE2317151A1 (de) Metallgiessverfahren und vorrichtung zur durchfuehrung des verfahrens
DE2319004B2 (de) Stopfenbetätigungseinrichtung für Gießpfanne
DE1952968B2 (de) Druckgiessmaschine zum vergiessen hochschmelzender metalle

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19930526

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR GB IT

17Q First examination report despatched

Effective date: 19941012

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR GB IT

REF Corresponds to:

Ref document number: 59202464

Country of ref document: DE

Date of ref document: 19950713

ITF It: translation for a ep patent filed

Owner name: BUGNION S.P.A.

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2074882

Country of ref document: ES

Kind code of ref document: T3

ET Fr: translation filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19950829

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 19960329

Year of fee payment: 5

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970313

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 19990503

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20000224

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20000320

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20000523

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010312

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20010312

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20011130

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020101

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050312