DE973984C - Metallic core for casting molds, molds or the like. - Google Patents
Metallic core for casting molds, molds or the like.Info
- Publication number
- DE973984C DE973984C DEL12352A DEL0012352A DE973984C DE 973984 C DE973984 C DE 973984C DE L12352 A DEL12352 A DE L12352A DE L0012352 A DEL0012352 A DE L0012352A DE 973984 C DE973984 C DE 973984C
- Authority
- DE
- Germany
- Prior art keywords
- core
- molds
- casting
- metallic core
- light metal
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/101—Permanent cores
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
Metallischer Kern für Gießformen-, Kokillen od. dgl. Bei der Herstellung von Gußstücken ist es allgemein üblich, gewünschte Hohlräume in den Gußkörpern durch Einlegen von Kernen in die Gießform zu erzeugen. Will man dauerhafte und wiederholt verwendbare- Kerne aus Metall benutzen, so bereitet das Entfernen des Kernes aus dem erkalteten Gußstück Schwierigkeiten, weil dieses auf den Kern aufgeschrumpft ist. Um das Entfernen metallischer Kerne zu erleichtern, hat man bisher ausschließlich Kerne mit Anzug, d. h. mit konischer Mantelfläche, benutzt. Naturgemäß kann man mit derartigen Kernen im Gußkörper nur Hohlräume mit konischen Wandungen herstellen. In der Regel benötigt man aber prismatische, insbesondere zylindrische Höhlungen im Gußstück und muß die konischen Wandungen nachträglich unter Zerstörung der Gußhaut ausbohren. Die Erfindung bezweckt, diese Nachteile in einfacher Weise zu beseitigen. Erfindungsgemäß soll ein metallischer Dauerkern ohne Anzug verwandt werden, der vorzugsweise aus Leichtmetall besteht und dessen Ausdehnungskoeffizient größer ist als das Schwindmaß des zu vergießenden Werkstoffes. Will man beispielsweise in einem Gußstück aus Aluminiumlegierung mit einem Schwindmaß von höchstens 10/, eine zylindrische Bohrung herstellen, so verwendet man zweckmäßig einen zylindrischen Kern aus Reinaluminium. Der Kern wird beim Vergießen der Legierung je nach seiner Größe auf etwa q.oo bis 5oo° C erwärmt und dehnt sich dabei um etwa r,2 °/o aus. Die zunächst fest am Kern anliegende, erstarrende Legierung schrumpft bei der nachfolgenden Abkühlung auf Außentemperatur weniger stark als der Kern. Dieser kann dann ohne weiteres aus der Höhlung des Gußstückes herausgezogen werden, bzw. er fällt von selbst heraus. Die Höhlung selbst ist völlig zylindrisch und braucht nicht nachgearbeitet zu werden, wenn man die Gußhaut ihrer Wandung erhalten will, was in der Regel erwünscht sein dürfte.Metallic core for casting molds, chill molds or the like. In the manufacture of castings, it is common practice to create desired cavities in the castings by inserting cores into the casting mold. If you want to use permanent and repeatedly usable cores made of metal, the removal of the core from the cooled casting presents difficulties because it is shrunk onto the core. In order to facilitate the removal of metallic cores, cores with a suit, ie with a conical outer surface, have hitherto been used exclusively. Naturally, cores of this type can only be used to produce cavities with conical walls in the cast body. As a rule, however, prismatic, in particular cylindrical, cavities are required in the casting and the conical walls have to be subsequently drilled out, destroying the casting skin. The invention aims to eliminate these disadvantages in a simple manner. According to the invention, a metallic permanent core without a suit is to be used, which is preferably made of light metal and whose coefficient of expansion is greater than the shrinkage of the material to be cast. If, for example, a cylindrical bore is to be produced in a casting made of aluminum alloy with a shrinkage of at most 10 /, then it is expedient to use a cylindrical core made of pure aluminum. When the alloy is cast, the core is heated to around 300 to 500 ° C, depending on its size, and expands by around r.2%. The solidifying alloy, which initially lies firmly on the core, shrinks less than the core when it cools down to outside temperature. This can then be easily pulled out of the cavity of the casting, or it falls out by itself. The cavity itself is completely cylindrical and does not need to be reworked if you want to keep the cast skin of its wall, which should be desirable as a rule.
Bei Leichtmetallkernen wird zweckmäßig die Mantelfläche des Kernes anodisch oxydiert. Die gebildete Oxydschicht hat einen so hohen Schmelzpunkt, daß ein Schmelzen des Kernes mit Sicherheit verhindert wird. Zum gleichen Zweck kann man den Kern an Stelle der Oxydation seiner Mantelfläche oder zusätzlich während des Gießvorganges auch noch kühlen, z. B. mittels einer durch eine Kernbohrung geleiteten Flüssigkeit. Selbstverständlich darf die Kühlung des Kernes nur so bemessen sein, daß seine Temperatur etwas unterhalb seines Schmelzpunktes liegt. Anderenfalls würde der Kern beim Erkalten im Sinne der Erfindung nicht genügend schrumpfen können.In the case of light metal cores, the outer surface of the core is expedient anodically oxidized. The oxide layer formed has such a high melting point that melting of the core is prevented with certainty. For the same purpose can the core instead of the oxidation of its jacket surface or additionally during the casting process also cool, z. B. by means of a guided through a core hole Liquid. Of course, the cooling of the core may only be dimensioned in such a way that that its temperature is slightly below its melting point. Otherwise would the core cannot shrink sufficiently in the context of the invention when it cools.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEL12352A DE973984C (en) | 1952-05-16 | 1952-05-16 | Metallic core for casting molds, molds or the like. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEL12352A DE973984C (en) | 1952-05-16 | 1952-05-16 | Metallic core for casting molds, molds or the like. |
Publications (1)
Publication Number | Publication Date |
---|---|
DE973984C true DE973984C (en) | 1960-08-11 |
Family
ID=7259153
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEL12352A Expired DE973984C (en) | 1952-05-16 | 1952-05-16 | Metallic core for casting molds, molds or the like. |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE973984C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0642855A1 (en) * | 1993-08-27 | 1995-03-15 | Toyota Jidosha Kabushiki Kaisha | Casting mold |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE431066C (en) * | 1924-07-23 | 1926-06-29 | Ludw Loewe & Co Akt Ges | Mold with adjustable cooling, especially for bearing shells |
GB543577A (en) * | 1940-07-01 | 1942-03-04 | Conrad Anthony Parlanti | Improvements in and relating to the casting of non-ferrous metals |
CH251451A (en) * | 1940-07-01 | 1947-10-31 | Parlanti Conrad Anthony | Process for obtaining molded metal objects. |
DE971052C (en) * | 1952-02-09 | 1958-12-04 | Karl Schmidt Ges Mit Beschraen | Process for composite casting of metals with the formation of an intermediate layer |
-
1952
- 1952-05-16 DE DEL12352A patent/DE973984C/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE431066C (en) * | 1924-07-23 | 1926-06-29 | Ludw Loewe & Co Akt Ges | Mold with adjustable cooling, especially for bearing shells |
GB543577A (en) * | 1940-07-01 | 1942-03-04 | Conrad Anthony Parlanti | Improvements in and relating to the casting of non-ferrous metals |
CH251451A (en) * | 1940-07-01 | 1947-10-31 | Parlanti Conrad Anthony | Process for obtaining molded metal objects. |
DE971052C (en) * | 1952-02-09 | 1958-12-04 | Karl Schmidt Ges Mit Beschraen | Process for composite casting of metals with the formation of an intermediate layer |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0642855A1 (en) * | 1993-08-27 | 1995-03-15 | Toyota Jidosha Kabushiki Kaisha | Casting mold |
US5615726A (en) * | 1993-08-27 | 1997-04-01 | Toyota Jidosha Kabushiki Kaisha | Casting mold |
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