EP0124801A2 - Procédé de fabrication de coulées de précision selon le procédé de moulage en plâtre - Google Patents

Procédé de fabrication de coulées de précision selon le procédé de moulage en plâtre Download PDF

Info

Publication number
EP0124801A2
EP0124801A2 EP84104215A EP84104215A EP0124801A2 EP 0124801 A2 EP0124801 A2 EP 0124801A2 EP 84104215 A EP84104215 A EP 84104215A EP 84104215 A EP84104215 A EP 84104215A EP 0124801 A2 EP0124801 A2 EP 0124801A2
Authority
EP
European Patent Office
Prior art keywords
mold
molding
poured
water
solidified
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
EP84104215A
Other languages
German (de)
English (en)
Other versions
EP0124801B1 (fr
EP0124801A3 (en
Inventor
Fritz Fässle
Siegmund Stadler
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.)
BK Giulini Chemie GmbH
Original Assignee
Giulini Chemie 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 Giulini Chemie GmbH filed Critical Giulini Chemie GmbH
Priority to AT84104215T priority Critical patent/ATE64114T1/de
Publication of EP0124801A2 publication Critical patent/EP0124801A2/fr
Publication of EP0124801A3 publication Critical patent/EP0124801A3/de
Application granted granted Critical
Publication of EP0124801B1 publication Critical patent/EP0124801B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/15—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using vacuum

Definitions

  • the present invention relates to a process for the production of castings with sharp detail reproduction and high measuring accuracy according to the gypsum molding process: and the precision casting produced with this molding process.
  • Gypsum molding processes have long been got: t.
  • the molding material in these processes mainly consists of gypsum.
  • Other components can include sand, cement, sodium silicate, asbestos, etc. be.
  • the gypsum has the function of a binder and can also be used in higher temperature ranges.
  • precision outlets cannot be produced using this process, even if the vacuum molding process is used.
  • a powder mixture which contains alpha-calcium sulfate hemihydrate (binder) as essential constituents, optionally also cement and chamotte and / or quartz powder as filler. Sufficient water is added to this mixture so that sufficient gas permeability is achieved, which applies to a pore volume of at least 25%.
  • the required smooth surface of the mold is achieved with a defined grain distribution.
  • Auxiliaries such as setting accelerators, retarders, glass fibers, etc. can be added to the mixture.
  • a key feature of the new process is that that the adhering water of the molding compound is removed by pressure drainage. In this way, considerable amounts of energy can be saved, so that the casting process can now also be used for large-area precision castings and series castings.
  • the evacuation during metal casting additionally reduces the energy requirement, it being further advantageous that pressure drainage and evacuation can be carried out using the same system (drainage device).
  • g Prior to molding, g is the USS, a drain in the form of a porous hose-applied or a perforated fiberglass mat over theboxformende original, which is coated with a release agent.
  • this is expediently done with a close-meshed wire mesh, which is attached at a distance of approx. 10 mm above the original and is slightly flexible.
  • the hose is then attached to the wire in a lump-like manner and led outward at one end through the mold frame or through the mold. No wire mesh is required when using perforated glass fiber mats.
  • the molding compound is poured into the prepared molding box.
  • an upper or lower box or multi-part molds can be produced.
  • the molding compositions (negative forms) are lifted immediately after solidification from the original and to remove the water to the P reß Kunststoff für an institute..Das squeezing the water is advantageously carried out with a pressure increase of 0.1 bar per minute, and in fact until about 2 bar are reached. For complete Water removal will maintain this pressure for a period of time, such as 10 to 20 minutes. In most cases, 10 to 20 minutes is enough.
  • the pore space formed by the water squeezing is essential for the subsequent metal casting.
  • the negative molds After pressing, the negative molds remain open and stored for approx. 2 hours until they have set completely. A further 24-hour drying at 60 - 100 ° C may be necessary for larger molds. However, it is also necessary if a sufficient vacuum performance cannot be achieved in the subsequent metal casting.
  • the vacuum lines are connected to the compressed air nozzle (s). This can be done using a direct-working vacuum pump with sufficient performance, as well as using a pre-evacuated vessel.
  • the negative mold is evacuated and the melt is poured in immediately.
  • the maximum amount of gas is 4 l / qdm mold surface.
  • the rear wall thickness of the mold is greater than the distance between the hose and the work surface. In most cases a double to three times the wall thickness is sufficient.
  • a fitting plastic original (model), size approx. 20 x 10 x 8 cm, was coated with a wafer-thin oil film as a separating agent ur: d in a mold box with the internal dimensions 24 x 14 x 11 cm.
  • An easily deformable wire mesh with a mesh size of approx. 2 - 3 cm was adapted to this original surface.
  • a porous fabric tube of 8 mm diameter was connected to the wire mesh with a lateral distance of about 2 cm, the tube end was connected to the pipe socket attached to the molding box and the drainage device was fixed about 1 cm above the model.
  • the mold box with the negative model for the following cast aluminum was connected to a vacuum line. A negative pressure of -0.9 bar was established.
  • the molten aluminum alloy (720 ° C) was filled into the evacuated mold. The casting was demolded after the alloy had completely solidified, which was the case after about 20 minutes. The negative mold could be used for three more metal castings.
  • Example 1 a perforated mineral wool fiber mat with a thickness of 2 cm was used.
  • the hole diameter was 1.5 cm, the distance from hole to hole was 2-3 cm.
  • the molding box was filled with the casting compound approx. 1 cm above the original and then the mineral wool fiber mat was fixed at a distance of approx. 1 cm above the original surface and the molding box was then filled up. Breaking out, evacuation and metal casting were carried out as in Example 1.
  • Parts 1a of the molding box are designated by 1a) and 1b) in the figure.
  • the model 7 lying in the box half 1a) is with the wire mesh fabric 6 on which the porous fabric tube 2 is arranged in a serpentine manner.
  • the compressed gas is introduced through the nozzle at 4 and the vacuum is drawn off through the same nozzle.
  • the molding compound is indicated with the number 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Producing Shaped Articles From Materials (AREA)
  • Mold Materials And Core Materials (AREA)
  • Dental Preparations (AREA)
EP84104215A 1983-05-06 1984-04-13 Procédé de fabrication de coulées de précision selon le procédé de moulage en plâtre Expired - Lifetime EP0124801B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84104215T ATE64114T1 (de) 1983-05-06 1984-04-13 Verfahren zur herstellung von praezisionsguessen nach dem gips-formverfahren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3316571 1983-05-06
DE3316571A DE3316571C2 (de) 1983-05-06 1983-05-06 Verfahren zur Herstellung von Präzisionsgießformen nach dem Gips - Formverfahren, Gießform und deren Verwendung

Publications (3)

Publication Number Publication Date
EP0124801A2 true EP0124801A2 (fr) 1984-11-14
EP0124801A3 EP0124801A3 (en) 1988-03-23
EP0124801B1 EP0124801B1 (fr) 1991-06-05

Family

ID=6198315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84104215A Expired - Lifetime EP0124801B1 (fr) 1983-05-06 1984-04-13 Procédé de fabrication de coulées de précision selon le procédé de moulage en plâtre

Country Status (4)

Country Link
US (1) US4541471A (fr)
EP (1) EP0124801B1 (fr)
AT (1) ATE64114T1 (fr)
DE (2) DE3316571C2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0203333A2 (fr) * 1985-05-30 1986-12-03 Giulini Chemie GmbH Procédé de fabrication de moules, modèles et outils à base de platre dur et/ou ciment
DE3832370A1 (de) * 1988-04-29 1989-11-09 Giulini Chemie Neue, zur herstellung von mit wasser auswaschbaren kernen und formen geeignete keramische mischungen
EP0467025A2 (fr) * 1990-07-20 1992-01-22 Giulini Chemie GmbH Moules, modèles et outils de poids léger à base de gypse

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3320309C2 (de) * 1983-06-04 1985-08-14 Giulini Chemie Gmbh, 6700 Ludwigshafen Verfahren zur Herstellung von Präzisionsmeßformen, Gießformen und deren Verwendung
GB2408260A (en) * 2003-11-20 2005-05-25 Doncasters Ltd Moulding composition including water-insoluble lubricant
BRPI0507213A (pt) * 2004-02-19 2007-06-19 Jean Sam Lee aparelho e método para a manufatura de artigos de cerámica
DE112005001528T5 (de) * 2004-07-12 2007-05-24 Dai Nippon Printing Co., Ltd. Abschirmfilter für elektromagnetische Wellen
CN109226704B (zh) * 2018-11-03 2024-06-14 深圳阿尔泰克轻合金技术有限公司 一种铝锭生产系统及方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE564615A (fr) *
US2529835A (en) * 1947-01-18 1950-11-14 United States Gypsum Co Metal-casting molds and processes and materials for producing the same
US2882569A (en) * 1957-03-29 1959-04-21 Ram Inc Method and apparatus for molding and hardening articles
US3651855A (en) * 1968-02-23 1972-03-28 Henri Jean Daussan Continuous slurry supply method for fabrication of mold linings
US3825058A (en) * 1972-04-15 1974-07-23 Sintokogio Ltd Mold prepared by vacuum sealed molding process

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1939433B2 (de) * 1969-08-02 1970-10-08 Daimler Benz Ag Vorrichtung zur Dosierung eines Katalysators fuer Giessereibetrieb
DE1940924A1 (de) * 1969-08-12 1971-02-25 Michel Horst Werner Verfahren und Geraet zum Aushaerten von Sandformen und Kernen fuer Giessereizwecke
CH524415A (de) * 1970-04-20 1972-06-30 Gruenzweig & Hartmann Einrichtung für die Durchführung des Vollformgiessverfahrens
JPS544817A (en) * 1977-06-15 1979-01-13 Hitachi Ltd Selffhardening casting sand

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE564615A (fr) *
US2529835A (en) * 1947-01-18 1950-11-14 United States Gypsum Co Metal-casting molds and processes and materials for producing the same
US2882569A (en) * 1957-03-29 1959-04-21 Ram Inc Method and apparatus for molding and hardening articles
US3651855A (en) * 1968-02-23 1972-03-28 Henri Jean Daussan Continuous slurry supply method for fabrication of mold linings
US3825058A (en) * 1972-04-15 1974-07-23 Sintokogio Ltd Mold prepared by vacuum sealed molding process

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0203333A2 (fr) * 1985-05-30 1986-12-03 Giulini Chemie GmbH Procédé de fabrication de moules, modèles et outils à base de platre dur et/ou ciment
DE3519367A1 (de) * 1985-05-30 1986-12-04 Giulini Chemie Gmbh, 6700 Ludwigshafen Verfahren zur herstellung von formen, modellen und werkzeugen auf hartgips - und/oder zementbasis
EP0203333A3 (en) * 1985-05-30 1987-07-22 Giulini Chemie Gmbh Method of producing moulds, patterns and tools on base of hard gypsum and/or cement
US4749431A (en) * 1985-05-30 1988-06-07 Giulini Chemie Gmbh Process for producing molds, models and tools based on hard gypsum and/or cement
DE3832370A1 (de) * 1988-04-29 1989-11-09 Giulini Chemie Neue, zur herstellung von mit wasser auswaschbaren kernen und formen geeignete keramische mischungen
EP0467025A2 (fr) * 1990-07-20 1992-01-22 Giulini Chemie GmbH Moules, modèles et outils de poids léger à base de gypse
EP0467025A3 (en) * 1990-07-20 1992-12-09 Giulini Chemie Gmbh Light moulds, patterns and tools on gypsum base

Also Published As

Publication number Publication date
ATE64114T1 (de) 1991-06-15
EP0124801B1 (fr) 1991-06-05
DE3484663D1 (de) 1991-07-11
EP0124801A3 (en) 1988-03-23
US4541471A (en) 1985-09-17
DE3316571C2 (de) 1985-08-22
DE3316571A1 (de) 1984-11-08

Similar Documents

Publication Publication Date Title
DE69114954T2 (de) Steigendguss unter Verwendung einer besonders gelagerten verlorenen Gussform mit dünnwandigem Überzug.
EP0124801B1 (fr) Procédé de fabrication de coulées de précision selon le procédé de moulage en plâtre
DE2626224C2 (de) Verfahren zur Entfernung von Formmasse aus einer mit Guß gefüllten Form
DE2352492B2 (de) Verfahren zur herstellung von durch unterdruck stabilisierten, hohlen giessformen
DE2263212C2 (de) Verfahren zum Herstellen lederharter Formlinge
DE3320309C2 (de) Verfahren zur Herstellung von Präzisionsmeßformen, Gießformen und deren Verwendung
EP0125510B1 (fr) Procédé de fabrication de coulées de précision
DE2305229A1 (de) Formkasten
CH622726A5 (en) Method for knocking out silicate-bound moulding compound from a mould filled with casting
DE1558139B1 (de) Verfahren zum Halten von Kernen in Praezisionsgiessformen
DE428131C (de) Verfahren zum Pressen von Formstuecken aus keramischen Massen, besonders aus Porzellanmasse
DE874724C (de) Verfahren zur Herstellung von keramischen Formkoerpern, insbesondere von groesseren, z. B. sanitaeren Gegenstaenden, wie Waschbecken, Spuelbecken od. dgl.
DE1584396A1 (de) Verfahren zur masshaltigen Herstellung von Formstuecken aus Faserzement
AT93334B (de) Keramische Form.
DE703145C (de) Verfahren und Vorrichtung zum Herstellen von Schmelzhaefen, insbesondere Glasschmelzhaefen
AT204196B (de) Verfahren und Vorrichtung zur Herstellung von Gießformen für die aluminothermische Zwischengußschweißung von Werkstücken, vorzugsweise Schienen
DE663057C (de) Verfahren zum Herstellen von Formkoerpern mit Kalk- oder Zementbindung
DE2011909A1 (en) Parting pressure cast green ceramic slip castings
DE19847049A1 (de) Keramische Hochtemperaturfilter mittels Vibrationsverdichtung
AT58635B (de) Verfahren zur Herstellung von Betonrohren und dgl.
DE808451C (de) Innenruettler
DE1783159C3 (de) Verfahren zum Abdichten von Fugen. Ausscheidung aus: 1758487
EP0043912B1 (fr) Procédé de coulée sous vide
AT54656B (de) Verfahren zur Herstellung von Kunstmarmor.
AT73371B (de) Verfahren und Form zur Herstellung von Korkisoliersteinen.

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

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19841201

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17Q First examination report despatched

Effective date: 19890316

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

REF Corresponds to:

Ref document number: 64114

Country of ref document: AT

Date of ref document: 19910615

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3484663

Country of ref document: DE

Date of ref document: 19910711

ITF It: translation for a ep patent filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
ET Fr: translation filed
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
EPTA Lu: last paid annual fee
EAL Se: european patent in force in sweden

Ref document number: 84104215.3

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

Ref country code: LU

Payment date: 19950301

Year of fee payment: 12

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

Ref country code: GB

Payment date: 19950407

Year of fee payment: 12

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

Ref country code: BE

Payment date: 19950412

Year of fee payment: 12

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

Ref country code: AT

Payment date: 19950413

Year of fee payment: 12

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

Ref country code: NL

Payment date: 19950430

Year of fee payment: 12

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

Ref country code: CH

Payment date: 19950728

Year of fee payment: 12

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

Ref country code: LU

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

Effective date: 19960413

Ref country code: GB

Effective date: 19960413

Ref country code: AT

Effective date: 19960413

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

Ref country code: LI

Effective date: 19960430

Ref country code: CH

Effective date: 19960430

Ref country code: BE

Effective date: 19960430

BERE Be: lapsed

Owner name: GIULINI CHEMIE G.M.B.H.

Effective date: 19960430

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

Ref country code: NL

Effective date: 19961101

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

Effective date: 19960413

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 19961101

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

Ref country code: SE

Payment date: 20000417

Year of fee payment: 17

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

Ref country code: DE

Payment date: 20010305

Year of fee payment: 18

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

Ref country code: SE

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

Effective date: 20010414

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

Ref country code: FR

Payment date: 20010420

Year of fee payment: 18

EUG Se: european patent has lapsed

Ref document number: 84104215.3

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: 20021101

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: 20021231

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST