DE2557991B2 - Mold core for creating cavities in cast parts - Google Patents
Mold core for creating cavities in cast partsInfo
- Publication number
- DE2557991B2 DE2557991B2 DE19752557991 DE2557991A DE2557991B2 DE 2557991 B2 DE2557991 B2 DE 2557991B2 DE 19752557991 DE19752557991 DE 19752557991 DE 2557991 A DE2557991 A DE 2557991A DE 2557991 B2 DE2557991 B2 DE 2557991B2
- Authority
- DE
- Germany
- Prior art keywords
- mold core
- jacket
- mold
- cast parts
- core
- 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
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
- B29C33/48—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 with means for collapsing or disassembling
- B29C33/50—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 with means for collapsing or disassembling elastic or flexible
- B29C33/505—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 with means for collapsing or disassembling elastic or flexible cores or mandrels, e.g. inflatable
Description
Die Erfindung betrifft einen Formkern zum Erzeugen von Hohlräumen in Gießteilen, insbesondere solchen aus gefüllten oder ungefüllten Reaktionsharzen oder anderen Kunststoffen.The invention relates to a mold core for producing cavities in cast parts, in particular such made of filled or unfilled reactive resins or other plastics.
Solche Hohlräume werden dadurch erzeugt, daß Formkerne vor dem Vergießen an die Stellen eingelegt werden, an denen beim fertigen, vergossenen Teil Hohlräume vorhanden sein sollen. Nach dem Vergießen und Aushärten müssen diese Formkerne durch einen Entformungsvorgang aus dem Gußteil entfernt werden.Such cavities are created by inserting mold cores at the points before casting where cavities should be present in the finished, cast part. After potting and curing, these mold cores must be removed from the casting by a demolding process will.
Solche Formkerne waren bisher im wesentlichen in zwei Ausführungen bekannt:So far, such mold cores have essentially been known in two versions:
1. Als starre Formkerne aus Metall oder Werkzeugharz, bei denen die Entformungsmöglichkeit durch konische Ausbildung der Oberfläche gegeben ist. Diese Formkerne haben den Nachteil, daß ihre Herstellung wegen der Konizität aufwendig ist. Zudem ist es nicht immer erwünscht, daß die Oberfläche des entstehenden Hohlraumes im fertigen Teil konisch ist. Letzteres ist besonders nachteilig bei solchen Formkernen, die eine im Verhältnis zu ihrer kleinsten Dicke große Länge in Entformungsrichtung haben. Zudem entstehen durch die stets vorhandene Oberflächenwelligkeit des Formkerns, bedingt durch sein Herstellungsverfahren, beim Entformen Deformierungskräfte, die zur Beschädigung des fertigen Teils und zum Verschleiß des Formkerns führen.1. As rigid mold cores made of metal or tool resin, where the possibility of demolding is given by the conical design of the surface. These mold cores have the disadvantage that their production is expensive because of the conicity. In addition, it is not always desirable that the surface of the resulting cavity in the finished part is conical. The latter is special disadvantageous in those mold cores that are large in relation to their smallest thickness Have length in the direction of demolding. In addition, the surface waviness is always present of the mold core, due to its manufacturing process, deforming forces during demoulding, which can damage the finished part and lead to wear of the mold core.
2. Elastische Formkerne aus nachgiebigem Material, z. B. Silikon-Kautschuk, Gummi usw. sind aus dem DT-Gbm 1992250 bekannt, die aber einem hohen Verschleiß unterliegen und nicht formstabil sind.2. Elastic mold cores made of flexible material, e.g. B. silicone rubber, rubber, etc. are known from DT-Gbm 1992250, but which are subject to high wear and tear and not are dimensionally stable.
Γ)Γ)
3. Aus der DE-OS 2344715 sind Formkerne für zylindrische Hohlräume bekannt, die aus einem Hohlzylinder mit durchgehendem Längsschlitz und einem in den Längsschlitz eingesetzten elastischen Dichtungselement zur Aufnahme der Schrumpfspannungen bestehen. Da die Schrumpfspannungen und Entformungskräfte nur tangential über den Umfang des Formkernmantels zum elastischen Dichtelement weitergeleitet werden können, sind diese Formkerne auf zylindrische Formen beschränkt.3. From DE-OS 2344715 mold cores for cylindrical cavities are known, which consist of a Hollow cylinder with a continuous longitudinal slot and an elastic one inserted into the longitudinal slot Sealing element to absorb the shrinkage stresses exist. As the shrinkage stresses and demolding forces only passed tangentially over the circumference of the mold core jacket to the elastic sealing element can be, these mandrels are limited to cylindrical shapes.
4. Aus der DD-PS 80451 ist ein wiederverwendbarer Formkern mit spreizbarem Mantel bekannt, bei dem der Mantel mit porösem Schaumstoff hinterfüttert ist. Um einen solchen Kern herzustellen, bedarf es eines großen Arbeitsaufwandes. 4. The DD-PS 80451 is a reusable one Mold core with expandable jacket known, in which the jacket with porous foam is backed. A great deal of work is required to produce such a core.
Ziel der vorliegenden Erfindung ist es, formstabile Formkerne mit geringem Arbeitsaufwand herzustellen. The aim of the present invention is to produce dimensionally stable mold cores with little effort.
Die Formkerne der vorliegenden Erfindung sind dadurch gekennzeichnet, daß der Mantel einen elastischen Kern aus gummiartigem Material enthält. Dank dieses Aufbaus werden die Zugkräfte im Formkern beim Entformen von diesem dünnen, federnden Mantel aufgenommen und die Deformierungskräfte infolge der unvermeidbaren Oberflächenwelligkeit des Formkernmantels auf Grund seiner Nachgiebigkeit an den elastischen Kern weitergegeben. Der elastische Kern des erfindungsgemäßen Formkerns besteht aus nachgiebigem Material z. B. Silikonkautschuk.The mold cores of the present invention are characterized in that the jacket is an elastic one Contains core made of rubber-like material. Thanks to this structure, the tensile forces in the mold core added during demolding of this thin, resilient jacket and the deformation forces as a result the unavoidable surface waviness of the mold core shell due to its flexibility passed the elastic core. The elastic core of the mold core according to the invention consists of compliant material e.g. B. silicone rubber.
Der federnde Mantel besteht vorzugsweise aus Metallblech und kann in einfacher Weise aus Standard-Blechprofilen hergestellt werden.The resilient jacket is preferably made of sheet metal and can easily be made from standard sheet metal profiles getting produced.
Der elastische Kern muß jedoch nicht den gesamten, von dem Mantel umschlossenen Hohlraum ausfüllen, sondern kann z. B. auch nur an den Enden des Hohlkörpers angeordnet sein.However, the elastic core does not have to fill the entire cavity enclosed by the jacket, but can e.g. B. be arranged only at the ends of the hollow body.
Der Mantel kann an geeigneten Stellen geschlitzt sein, und zwar einfach oder mehrfach, wobei die Schlitze in der Entformungsrichtung oder in einem Winkel zu dieser liegen können. Durch diese Schlitze wird die federnde Nachgiebigkeit des Formkerns erhöht, was von besonderem Vorteil bei Formkernen mit relativ großen Längen in Entformungsrichtung ist.The jacket can be slit at suitable points, one or more times, with the Slots in the demolding direction or at an angle to this can lie. Through these slots the resilience of the mold core is increased, which is of particular advantage in the case of mold cores with relatively long lengths in the direction of demolding.
Die Erfindung wird durch die Zeichnung näher erläutert. Es zeigtThe invention is explained in more detail by the drawing. It shows
Fig. 1 ein Ausführungsbeispiel eines Formkerns gemäß der Erfindung aus einem dünnwandigen Mantel (2) mit einem elastischen Kern (3) in einem gegossenen Kunststoffteil (1),Fig. 1 shows an embodiment of a mold core according to the invention made of a thin-walled jacket (2) with an elastic core (3) in a cast plastic part (1),
F i g. 2 eine Ausführung des Formkernes mit einfach geschlitztem Mantel in Entformungsrichtung,F i g. 2 shows an embodiment of the mold core with a single slit jacket in the demolding direction,
Fig. 3 eine Ausführung des Formkerns mit einem unter einem Winkel zur Entformungsrichtung geschlitzten Mantel,Fig. 3 shows an embodiment of the mold core with a slotted at an angle to the demolding direction A coat,
Fig. 4 Beispiele von Hohlraum-Querschnitten, die durch Aneinanderreihen erfindungsgemäßer Formkerne leicht herzustellen sind,4 shows examples of cavity cross-sections obtained by lining up mold cores according to the invention are easy to manufacture
Fig. 5 und 6 Beispiele für verschiedene Formkernprofile beliebigen Querschnitts.5 and 6 examples of different mold core profiles of any cross-section.
Hierzu 2 Blatt ZeichnungenFor this purpose 2 sheets of drawings
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19752557991 DE2557991C3 (en) | 1975-12-22 | 1975-12-22 | Mold core for creating cavities in cast parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19752557991 DE2557991C3 (en) | 1975-12-22 | 1975-12-22 | Mold core for creating cavities in cast parts |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DE2557991A1 DE2557991A1 (en) | 1977-06-30 |
| DE2557991B2 true DE2557991B2 (en) | 1978-04-06 |
| DE2557991C3 DE2557991C3 (en) | 1978-11-16 |
Family
ID=5965277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19752557991 Expired DE2557991C3 (en) | 1975-12-22 | 1975-12-22 | Mold core for creating cavities in cast parts |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE2557991C3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3837571A1 (en) * | 1988-11-05 | 1990-05-10 | Asea Brown Boveri | Torpedo and use of the torpedo |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4681724A (en) * | 1986-04-28 | 1987-07-21 | United Technologies Corporation | Removable irreversibly shrinking male mandrel |
| DE19929132C1 (en) * | 1999-06-25 | 2000-12-28 | Martin Wegen | Casting internal lining of pipe bend, is aided by multilayer flexible casting core from which layers are removed selectively and sequentially, once lining plastic has set |
| US8534339B2 (en) * | 2011-10-12 | 2013-09-17 | The Boeing Company | Lightweight flexible mandrel and method for making the same |
-
1975
- 1975-12-22 DE DE19752557991 patent/DE2557991C3/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3837571A1 (en) * | 1988-11-05 | 1990-05-10 | Asea Brown Boveri | Torpedo and use of the torpedo |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2557991A1 (en) | 1977-06-30 |
| DE2557991C3 (en) | 1978-11-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C3 | Grant after two publication steps (3rd publication) | ||
| 8327 | Change in the person/name/address of the patent owner |
Owner name: LARWS, REINER, 6394 GRAEVENWIESBACH, DE |
|
| 8339 | Ceased/non-payment of the annual fee |