DE1920581C3 - Method of making a casting mold - Google Patents

Method of making a casting mold

Info

Publication number
DE1920581C3
DE1920581C3 DE19691920581 DE1920581A DE1920581C3 DE 1920581 C3 DE1920581 C3 DE 1920581C3 DE 19691920581 DE19691920581 DE 19691920581 DE 1920581 A DE1920581 A DE 1920581A DE 1920581 C3 DE1920581 C3 DE 1920581C3
Authority
DE
Germany
Prior art keywords
molding sand
oil
making
casting mold
casting
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
Application number
DE19691920581
Other languages
German (de)
Other versions
DE1920581B2 (en
DE1920581A1 (en
Inventor
Heinz Dipl.-Ing. 6330 Lahn-Wetzlar Berndt
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.)
Buderus AG
Original Assignee
Buderus AG
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 Buderus AG filed Critical Buderus AG
Priority to DE19691920581 priority Critical patent/DE1920581C3/en
Priority to JP3462770A priority patent/JPS4940052B1/ja
Publication of DE1920581A1 publication Critical patent/DE1920581A1/en
Publication of DE1920581B2 publication Critical patent/DE1920581B2/en
Application granted granted Critical
Publication of DE1920581C3 publication Critical patent/DE1920581C3/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)

Description

Die vorliegende Erfindung bezieht sich auf ein Verfahren zum Herstellen von Gießformen aus Formsand, Bentonit, öl und Wasser, wobei gemäß Patent 17 83 1775 der Formsand mit einem öl mit hohem Anteil an schweren Kohlenwasserstoffen versetzt wird.The present invention relates to a method of making casting molds from Molding sand, bentonite, oil and water, according to Patent 17 83 1775 the molding sand mixed with an oil with a high proportion of heavy hydrocarbons will.

Ein solches Verfahren hat den hauptsächlichen Vorteil, daß neben der gewünschten Glanzkohlenstoffbildung beim Abgießen der Form, die Formsandmischung freies öl enthält, welches die in der Mischung enthaltenen Staubpartikel bindet und somit einer Staubentwicklung entgegenwirkt. Gleichzeitig ist damit eine geringere Desaktivierung des Bentonits und eine größere Fließfähigkeit und Gasdurchlässigkeit des Formsandes verbunden.The main advantage of such a process is that, in addition to the desired formation of lustrous carbon When pouring the mold, the molding sand mixture contains free oil, which is in the mixture binds contained dust particles and thus counteracts the development of dust. At the same time is with it less deactivation of bentonite and greater flowability and gas permeability of the Molding sand connected.

FOr die gießtechnische Qualität einer Gießform ist dieFor the casting quality of a casting mold is Festigkeit der Form während des Gießens vonStrength of the mold during the casting of

erheblicher Bedeutung, denn eine Reihe von Gußfehlern sind auf mangelnde Standfestigkeit während derof considerable importance, because a number of casting defects are due to a lack of stability during the

Berührung mit dem flüssigen Metall zurückzuführen.Contact with the liquid metal.

Es wurde nun gefunden, daß bei dem Verfahren der Hauptanmeldung, diese Eigenschaft wesentlich verbessert wird, wenn der Formsand mit einem im wesentlichen aus ungesättigten und/oder polymerisationsfähigen Kohlenwasserstoffen bestehenden öl '.'ersetzt wird.
Gesättigte Kohlenwasserstofföle sind beim Oberhitzen während des Gießprozesses relativ reaktionsträge, und verdampfen zum größten Teil unverändert, bevor sie thermisch zersetzt werden.It has now been found that in the process of the main application, this property is significantly improved if the molding sand is replaced with an oil consisting essentially of unsaturated and / or polymerizable hydrocarbons.
Saturated hydrocarbon oils are relatively inert when overheated during the casting process, and for the most part evaporate unchanged before they are thermally decomposed.

Die erfindungsgemäßen Öle haben den Vorteil, daß sie bei Hitzeeinwirkung zunächst polymerisieren und dadurch zur Bindung der Sandkörner beitragen, bevor sie durch weitere Hitzesteigerung in gasförmige Spaltprodukte zersetzt werden. Im kritischsten Zeitpunkt, nämlich vor der Erstarrung des flüssigen Metalls wird durch die eintretende Polymerisation des mit dem Formsand vermischten Öles aus ungesättigten schweren Kohlenwasserstoffen, die Formfestigkeit vorübergehend gesteigert.The oils according to the invention have the advantage that they first polymerize and when exposed to heat thereby contribute to the binding of the sand grains before they become gaseous due to further heat increase Fission products are decomposed. At the most critical point in time, namely before the liquid metal solidifies becomes through the occurring polymerization of the oil mixed with the molding sand from unsaturated heavy Hydrocarbons, the dimensional stability temporarily increased.

Claims (1)

Patentanspruch:Claim: Verfahren zum Herstellen von Gießformen aus Formsand, Bentonit, Öl und Wasser, wobei gemäß Patent 17 83 177Δ der Formsand mit einem öl mit hohem Anteil an schweren Kohlenwasserstoffen versetzt wird, dadurch gekennzeichnet, daß der Formsand mit einem im wesentlichen aus ungesättigten und/oder polymerisationsfähigen Kohlenwasserstoffen bestehenden öl versetzt wird.Process for the production of casting molds from molding sand, bentonite, oil and water, wherein according to patent 17 83 177 Δ the molding sand is mixed with an oil with a high proportion of heavy hydrocarbons, characterized in that the molding sand with an essentially unsaturated and / or polymerizable hydrocarbons existing oil is added.
DE19691920581 1969-04-23 1969-04-23 Method of making a casting mold Expired DE1920581C3 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19691920581 DE1920581C3 (en) 1969-04-23 1969-04-23 Method of making a casting mold
JP3462770A JPS4940052B1 (en) 1969-04-23 1970-04-22

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691920581 DE1920581C3 (en) 1969-04-23 1969-04-23 Method of making a casting mold

Publications (3)

Publication Number Publication Date
DE1920581A1 DE1920581A1 (en) 1970-11-05
DE1920581B2 DE1920581B2 (en) 1978-12-07
DE1920581C3 true DE1920581C3 (en) 1979-08-02

Family

ID=5732036

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19691920581 Expired DE1920581C3 (en) 1969-04-23 1969-04-23 Method of making a casting mold

Country Status (2)

Country Link
JP (1) JPS4940052B1 (en)
DE (1) DE1920581C3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS507558U (en) * 1973-05-18 1975-01-25
JPS521734A (en) * 1975-06-24 1977-01-07 Sasakura Eng Co Ltd Heat recovering method

Also Published As

Publication number Publication date
DE1920581B2 (en) 1978-12-07
DE1920581A1 (en) 1970-11-05
JPS4940052B1 (en) 1974-10-30

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Legal Events

Date Code Title Description
OGA New person/name/address of the applicant
C3 Grant after two publication steps (3rd publication)
8340 Patent of addition ceased/non-payment of fee of main patent