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 PDFInfo
- 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
Links
- 238000000465 moulding Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 4
- 238000005495 investment casting Methods 0.000 title description 3
- 239000011505 plaster Substances 0.000 title description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000005266 casting Methods 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 7
- 150000001875 compounds Chemical class 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims 1
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 2
- 239000012778 molding material Substances 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 abstract 1
- 238000005058 metal casting Methods 0.000 description 7
- 239000010440 gypsum Substances 0.000 description 6
- 229910052602 gypsum Inorganic materials 0.000 description 6
- 239000004744 fabric Substances 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000011490 mineral wool Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
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)
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)
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)
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 |
WO2005080055A1 (fr) * | 2004-02-19 | 2005-09-01 | Jea-Sam Lee | Dispositif et procede pour la fabrication de ceramique |
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)
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)
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 |
-
1983
- 1983-05-06 DE DE3316571A patent/DE3316571C2/de not_active Expired
-
1984
- 1984-04-13 EP EP84104215A patent/EP0124801B1/fr not_active Expired - Lifetime
- 1984-04-13 AT AT84104215T patent/ATE64114T1/de not_active IP Right Cessation
- 1984-04-13 DE DE8484104215T patent/DE3484663D1/de not_active Expired - Lifetime
- 1984-05-07 US US06/608,046 patent/US4541471A/en not_active Expired - Fee Related
Patent Citations (5)
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)
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 |
EP0124801A3 (en) | 1988-03-23 |
DE3484663D1 (de) | 1991-07-11 |
US4541471A (en) | 1985-09-17 |
DE3316571A1 (de) | 1984-11-08 |
DE3316571C2 (de) | 1985-08-22 |
EP0124801B1 (fr) | 1991-06-05 |
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