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

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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
model
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
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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 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

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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
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
DE3832370A1 (de) * 1988-04-29 1989-11-09 Giulini Chemie Neue, zur herstellung von mit wasser auswaschbaren kernen und formen geeignete keramische mischungen
EP0467025A3 (en) * 1990-07-20 1992-12-09 Giulini Chemie Gmbh Light moulds, patterns and tools on gypsum base

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
CN1921992B (zh) * 2004-02-19 2010-06-16 李在三 用于制造陶瓷制品的装置和方法
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

Family Cites Families (10)

* 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
US3153824A (en) * 1961-12-29 1964-10-27 Martin Metals Corp Method of casting metals
FR1563091A (fr) * 1968-02-23 1969-04-11
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
US3825058A (en) * 1972-04-15 1974-07-23 Sintokogio Ltd Mold prepared by vacuum sealed molding process
JPS544817A (en) * 1977-06-15 1979-01-13 Hitachi Ltd Selffhardening casting sand

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
DE3484663D1 (de) 1991-07-11
EP0124801B1 (fr) 1991-06-05
EP0124801A3 (en) 1988-03-23
DE3316571A1 (de) 1984-11-08
US4541471A (en) 1985-09-17
ATE64114T1 (de) 1991-06-15
DE3316571C2 (de) 1985-08-22

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