CH148560A - Process for the production of casting molds, in particular for synthetic resins. - Google Patents
Process for the production of casting molds, in particular for synthetic resins.Info
- Publication number
- CH148560A CH148560A CH148560DA CH148560A CH 148560 A CH148560 A CH 148560A CH 148560D A CH148560D A CH 148560DA CH 148560 A CH148560 A CH 148560A
- Authority
- CH
- Switzerland
- Prior art keywords
- salt
- mixture
- production
- synthetic resins
- water
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
- B29C33/52—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles soluble or fusible
Description
Verfahren zur Herstellung von Giessformen, insbesondere für Kunstharze. Bei der Herstellung von Gegenständen aus Kunstharzen, die in der Form aus gehärtet werden, macht sich der Übelstand bemerkbar, da.ss diese Formen verhältnis mässig lange für jedes Einzelstück besetzt sind, so dass für eine Grossproduktion unver hältnismässig viele, und weil aus Metall ge fertigt, teure Formen benötigt werden. Ausserdem ist es auf diese Weise sehr schwie rig, Gegenstände willkürlicher Form, zum Beispiel unterschnittene und Hohlkörper her zustellen, so da.ss das Fabrikationsgebiet auf Kunstharzgegenstände sehr verengt ist.
Dem gegenüber erlaubt das nachfolgend beschriebene Verfahren die Herstellung jedes beliebig geformten Körpers und einer billigen Massenproduktion. Es hat sich gezeigt, dass geschmolzene und amorph oder mikrokristal lin erstarrende Salze oder Salzgemische ge eignet sind, solche Formen oder Teilstücke., zum Beispiel Kerne, zu bilden. Es ist zwar bekannt, dass Alaune für andere ähnliche Zwecke geschmolzen und vergossen werden. Technisch steht der Verwendung des Alauns entgegen, dass dieser bei längerer Bereitstel lung im geschmolzenen Zustand durch Ent wässerung rasch dickflüssiger und unvergiess- bar wird.
Das vorliegende Verfahren vermeidet. diese Übelstände durch Anwendung eines leicht schmelzbaren, mit der Zeit seine Schmelz barkeit nicht verlierenden Gemisches von kristallwasserhaltigem Salz und in der Wärme in Wasser leicht löslichem Salz. Wird ein solches Gemisch erhitzt, so schmilzt das kristallwasserhaltige Salz zuerst und gibt infolge seines Dampfdruckes bei höherer Temperatur sein Wasser oder einen Teil des selben ab. Das anwesende, in der Wärme in Wasser leicht lösliche Salz nimmt. nun unter Auflösung das frei gewordene Wasser auf und hält es fest. Dadurch ist gewährleistet, dass auch bei längerem Erhitzen die Mischung ihre gewünschte Giesskonsistenz behält.
Die Gemische erstarren beim Abkühlen ausser ordentlich feinkörnig. da das sich abschei- dende zweite Salz in diesem Moment als Füllmittel wirkt. Deshalb ist auch die Schrumpfung dieser Kristallmassen verhält nismässig gering, und die feinen Kristallrisse gefährden den Zusammenhalt des Körpers weniger.
Beispiele für solche Mischungen sind: a) Kalium-Alaun 2 Teile Kaliumbisulfat 1 Teil b) Natriumsulfat-Dekahydrat 1() Teile Kaliumbisulfat 6,4 " e) Xagnesiumsulfat-Heptahydrat 10 Teile Kaliumbisulfat 5,8 " d) Zinksulfat-FIeptahydrat 22 Teile Kaliumbisulfat 1 Teil Die Berechnung obiger Mischungen ist so er folgt, da.ss das Kristallwasser der einen Kom ponente bei 100 gerade die ganze Menge der zweiten Komponente zu lösen vermag.
Diese Berechnungsart hat sich als brauchbar er wiesen, jedoch sind innerhalb gewisser Gren zen auch andere Verhältnisse der Komponen ten brauchbar, besonders die Erhöhung an kristallwasserarmem Salz.
Die Verwendung obiger Salze geschieht so, dass die Mischung so-weit erhitzt wird, bis alles flüssig ist, hierauf wird in kalte For men, am besten Metallformen vergossen. Die Gussstücke lassen sich leicht von der Wand lösen.
Zum Zweck der Verwendung beim Giessen von Kunstharzen wird die fertig katalysierte Mischung in die Salzform gegossen und bei Temperaturen unter dem Schmelzpunkt der Salzform erhärtet. Hierauf wird zur Aus härtung die Temperatur gesteigert, wobei all mählich die Salzform flüssig wird und ab- tropft und der Kunstharzgegenstand frei stehen bleibt. Er wird hierauf mit Wasser von den letzten Anteilen an Salz gereinigt. Die gebrauchten Salzgemische können immer wieder neu verwendet werden.
Process for the production of casting molds, in particular for synthetic resins. In the production of objects from synthetic resins that are hardened in the mold, the disadvantage becomes noticeable that these molds are occupied for a relatively long time for each individual piece, so that disproportionately many for a large-scale production, and because they are made of metal manufactures, expensive molds are needed. In addition, it is very difficult in this way to produce objects of arbitrary shape, for example undercut and hollow bodies, so that the manufacturing area is very narrowed to synthetic resin objects.
In contrast, the method described below allows the manufacture of any desired shape and inexpensive mass production. It has been shown that molten and amorphous or microcrystalline solidifying salts or salt mixtures are suitable for forming such shapes or parts, for example cores. While it is known that alums are melted and poured for other similar purposes. Technically, the use of alum is opposed to the fact that if it is kept in the molten state for a long time, it quickly becomes thicker and non-castable due to dewatering.
The present procedure avoids. these inconveniences through the use of an easily meltable mixture of salt containing water of crystallization and salt that is readily soluble in water when heated, which does not lose its meltability over time. If such a mixture is heated, the salt containing water of crystallization melts first and, due to its vapor pressure, gives off its water or part of it at a higher temperature. The salt that is present, easily soluble in water in the heat, takes. now the released water dissolves and holds it. This ensures that the mixture retains its desired pouring consistency even after prolonged heating.
The mixtures solidify on cooling apart from being extremely fine-grained. because the second salt which is deposited acts as a filler at this moment. Therefore, the shrinkage of these crystal masses is relatively small, and the fine crystal cracks endanger the cohesion of the body less.
Examples of such mixtures are: a) Potassium alum 2 parts potassium bisulphate 1 part b) Sodium sulphate decahydrate 1 () part potassium bisulphate 6.4 "e) Xagnesium sulphate heptahydrate 10 parts potassium bisulphate 5.8" d) Zinc sulphate peptahydrate 22 parts potassium bisulphate 1 part The above mixtures are calculated in such a way that the water of crystallization of one component is able to dissolve just the entire amount of the second component at 100.
This type of calculation has proven to be useful, but other component ratios can also be used within certain limits, especially the increase in salt with little water of crystallization.
The above salts are used in such a way that the mixture is heated until everything is liquid, after which it is poured into cold molds, preferably metal molds. The castings can be easily removed from the wall.
For the purpose of using it in the casting of synthetic resins, the completely catalyzed mixture is poured into the salt form and hardened at temperatures below the melting point of the salt form. The temperature is then increased for curing, the salt form gradually becoming liquid and dripping off and the synthetic resin object remaining free. It is then cleaned of the last parts of salt with water. The used salt mixtures can be used again and again.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH148560T | 1930-01-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH148560A true CH148560A (en) | 1931-07-31 |
Family
ID=4404349
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH148560D CH148560A (en) | 1930-01-13 | 1930-01-13 | Process for the production of casting molds, in particular for synthetic resins. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH148560A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1140998B (en) * | 1955-07-30 | 1962-12-13 | Siemens Ag | Process for the production of chamber cells for expansion chambers in expansion switches |
DE1189701B (en) * | 1958-12-03 | 1965-03-25 | Licentia Gmbh | Switching chamber for high-voltage switch made of cast resin |
DE1268741B (en) * | 1959-11-11 | 1968-05-22 | Tibbetts Industries | Process for the production of core-free self-supporting small electrical coils |
DE4230469C1 (en) * | 1992-09-11 | 1994-04-21 | Guenter Zillner | Process for the production of hollow plastic molded parts from fiber composite materials |
DE4308370A1 (en) * | 1993-03-16 | 1994-09-22 | M1 Sporttechnik Gmbh | Process and core body for producing a hollow molded or profile body made of fiber-reinforced plastic |
DE10034506C1 (en) * | 2000-07-15 | 2002-03-07 | Schott Glas | Process for producing cooling channels in shaping tools subject to operational thermal stress and associated shaping tool |
DE102014207949A1 (en) * | 2014-04-28 | 2015-10-29 | Bayerische Motoren Werke Aktiengesellschaft | Support hollow core and method for producing a fiber-reinforced hollow component |
DE102015212661A1 (en) * | 2015-07-07 | 2016-09-01 | Audi Ag | Method and device for producing a fiber-plastic composite molding |
DE102015209918A1 (en) * | 2015-05-29 | 2016-12-01 | Bayerische Motoren Werke Aktiengesellschaft | Process for producing a fiber-reinforced hollow component |
-
1930
- 1930-01-13 CH CH148560D patent/CH148560A/en unknown
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1140998B (en) * | 1955-07-30 | 1962-12-13 | Siemens Ag | Process for the production of chamber cells for expansion chambers in expansion switches |
DE1189701B (en) * | 1958-12-03 | 1965-03-25 | Licentia Gmbh | Switching chamber for high-voltage switch made of cast resin |
DE1268741B (en) * | 1959-11-11 | 1968-05-22 | Tibbetts Industries | Process for the production of core-free self-supporting small electrical coils |
DE4230469C1 (en) * | 1992-09-11 | 1994-04-21 | Guenter Zillner | Process for the production of hollow plastic molded parts from fiber composite materials |
DE4308370A1 (en) * | 1993-03-16 | 1994-09-22 | M1 Sporttechnik Gmbh | Process and core body for producing a hollow molded or profile body made of fiber-reinforced plastic |
DE10034506C1 (en) * | 2000-07-15 | 2002-03-07 | Schott Glas | Process for producing cooling channels in shaping tools subject to operational thermal stress and associated shaping tool |
DE102014207949A1 (en) * | 2014-04-28 | 2015-10-29 | Bayerische Motoren Werke Aktiengesellschaft | Support hollow core and method for producing a fiber-reinforced hollow component |
DE102015209918A1 (en) * | 2015-05-29 | 2016-12-01 | Bayerische Motoren Werke Aktiengesellschaft | Process for producing a fiber-reinforced hollow component |
DE102015212661A1 (en) * | 2015-07-07 | 2016-09-01 | Audi Ag | Method and device for producing a fiber-plastic composite molding |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE1917142A1 (en) | Manufacture of refractory molds and other articles at low temperatures | |
DE69818379T2 (en) | Process for full mold casting of aluminum with coated model | |
CH148560A (en) | Process for the production of casting molds, in particular for synthetic resins. | |
US2211133A (en) | Method of producing casting molds | |
DE598839C (en) | Process for the production of hollow rubber bodies with the aid of deliquescent cores | |
AT57642B (en) | Process for making molds from paraffin or the like. For casting objects made of concrete or the like. | |
DE876746C (en) | Method for producing undivided casting molds | |
DE2316393C2 (en) | Process for making lost foundry patterns | |
DE340781C (en) | Process for the production of uniformly porous foamed slag from foamy melts | |
DE864377C (en) | Process for the production of molded parts from melted slag | |
DE969774C (en) | Process for the production of casting molds | |
DE509243C (en) | Process for the production of caliber rolls | |
DE715506C (en) | Process for making molds | |
DE525447C (en) | Process for the production of molded parts from plastic masses | |
AT145509B (en) | Process for the manufacture of rubber and hard rubber articles. | |
DE607281C (en) | Process for the production of composite cast rolls | |
DE874724C (en) | Process for the production of ceramic molded bodies, in particular larger ones, e.g. B. sanitary items, such as wash basins, sinks or the like. | |
EP0125510B1 (en) | Method of making precision castings | |
DE1926163A1 (en) | Plastic ingot moulds filled with loose sand | |
DE544124C (en) | Process for the production of jaw models or the like. | |
AT21882B (en) | Process for the production of two-part molds for hollow vessels. | |
AT99208B (en) | Process for the production of moldings from sulfur-containing melts. | |
DE102005003719A1 (en) | Shaped part e.g. concrete casting part, manufacturing method, involves separating male mould from solidified fluid under exposure of stencil part, inserting casting material into stencil part, and liquefying stencil parts | |
DE523441C (en) | Process for the production of welding or wrought iron | |
DE583544C (en) | Process for the mass production of rod-shaped bodies |