DE2132536A1 - Sand-oil mixtures as mould and core mfg materials - giving increased strength and storage props - Google Patents

Sand-oil mixtures as mould and core mfg materials - giving increased strength and storage props

Info

Publication number
DE2132536A1
DE2132536A1 DE19712132536 DE2132536A DE2132536A1 DE 2132536 A1 DE2132536 A1 DE 2132536A1 DE 19712132536 DE19712132536 DE 19712132536 DE 2132536 A DE2132536 A DE 2132536A DE 2132536 A1 DE2132536 A1 DE 2132536A1
Authority
DE
Germany
Prior art keywords
sand
core
mould
mfg
props
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.)
Pending
Application number
DE19712132536
Other languages
German (de)
Inventor
Herbert Jung
Dietrich Unger
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
BuderusSche Eisenwerke 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 BuderusSche Eisenwerke AG filed Critical BuderusSche Eisenwerke AG
Priority to DE19712132536 priority Critical patent/DE2132536A1/en
Publication of DE2132536A1 publication Critical patent/DE2132536A1/en
Pending 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)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

Up to 0.5% of a heavy hydrocarbon hydrophobic oil is added to the sand and gives excellent storage properties to the completed moulds without fear of water absorption and strength loss. No further surface treatment of the mould is necessary since carbon is produced by the action of hot metal on the oil during casting. The moulds are strong, but can be easily broken up after casting to facilitate removal and cleaning of the cast item.

Description

Sandmischung zum Herstellen von Kernen und Formen Die Erfindung betrifft eine Formmasse zur Herstellung von Sandkernen und Sandformen. Sand mix for making cores and molds The invention relates to a molding compound for the production of sand cores and sand molds.

Formmassen zum Herstellen von Kernen und Formen bestehen aus Sandkörnern, einem Bindemittel und ggf. weiteren Zusätzen zur Beeinflussung der Eigenschaften der Formmasse. Ein Kern soll ausreichende Festigkeit aufweisen, lagerbeständig sein, eine glatte GußoberRläche gewährleisten, sich leicht aus dem Gußstück entfernen lassen und dergleichen mehr.Molding compounds for the production of cores and molds consist of grains of sand, a binder and possibly other additives to influence the properties the molding compound. A core should have sufficient strength, be storable, Ensure a smooth cast surface, easy to remove from the casting let and the like more.

Um für den Jeweiligen Anwendungsfall die optimalste Lösung zu haben, sind bereits die verschiedensten Zusammensetzungen der Formmasse vorgeschlagen worden. Vor allem unterscheiden sich Formmassen durch die unterschiedlichsten Bindemittel. Es seien nur Kunstharze zum Herstellen von Formen nach dem Hot-Box-Verfahren, Wasserglas in Formmassen, die nach dem C02-Verfahren gehärtet werden, und Zement erwähnt.In order to have the most optimal solution for the respective application, the most varied compositions of the molding compound have already been proposed. Above all, molding compounds differ in terms of a wide variety of binders. There are only synthetic resins for making molds using the hot box process, water glass in molding compounds that are hardened by the CO2 process, and cement.

Die Erfindung geht von der Aufgabe aus, die Eigenschaften dieser verschiedenen Formmasse durch einen billigen Zusatz zu verbessern. Hierzu wird erfindungsgemäß vorgeschlagen, der Kernsandmischung in geringen Mengen ein öl zuzusetzen, das im wesentlichen aus schweren Kohlenwasserstoffen besteht. Ein Zusatz von 0,5 % zu den üblichen Sandmischungen hat sich als ausreichend erwiesen. Ein derartiges öl wirkt in verschiedenen Richtungen sich positiv auf die Eigenschaften des hergestellten Kernes aus.The invention is based on the object, the properties of these various To improve molding compound by a cheap additive. To this end, according to the invention suggested adding an oil to the core sand mixture in small amounts, which is in the consists essentially of heavy hydrocarbons. An addition of 0.5% to the conventional sand mixtures has proven to be sufficient. Such an oil works in different directions have a positive effect on the properties of the manufactured Core.

Feuchte Form- und Kernsandmischungen setzen der Verdichtungsenergie einen bestimmten Widerstand entgegen. Dies führt dazu, daß die Kerne und/oder Formen nicht optimal verdichtet werden.Moist mold and core sand mixtures set the compaction energy against a certain resistance. This leads to, that the kernels and / or shapes are not optimally compacted.

Der Zusatz des erfindungsgemäßen öles wirkt als Gleitmittel und führt zu einer größeren Packungsdichte und damit zu höherer Festigkeit und verminderter Penetrationsanflligkeit des hergestellten Kernes. Eine Reihe von Bindemitteln sind hydrophil, was zur Folge hat, daß sich beim Lagern der Kerne durch die Feuchtigkeitsaufnahme die Festigkeit verringert und die Kerne unter Umständen unbrauchbar werden.The addition of the oil according to the invention acts as a lubricant and leads to a greater packing density and thus to higher strength and reduced Susceptibility to penetration of the core produced. A number of binders are available hydrophilic, which has the consequence that when the cores are stored they absorb moisture the strength is reduced and the cores may become unusable.

Das erfindungsgemäße 51 ist hydrophob und macht die Kerne un empfindlicher gegen die Einwirkung von Feuchtigkeit. Das flüssige Metall reagiert unter Umständen mit der Kernoberfläche.The 51 according to the invention is hydrophobic and makes the cores less sensitive against the effects of moisture. The liquid metal may react with the core surface.

Um dies zu vermeiden, werden Kerne geschlichtet oder geschwärzt.To avoid this, cores are finished or blackened.

Das erfindungsgemäße öl scheidet bei der Zersetzung inrolge Hitzeeinwirkung Glanzkohlenstoff an der Kernoberfläche aus, so daß es nicht notwendig list, Kerne zu schlichten oder zu schwärzen.The oil according to the invention separates on decomposition under the action of heat Bright carbon on the core surface, so that it is not necessary to list cores to finish or to blacken.

Kerne mit anorganischen Bindemitteln zerfallen nach dem Abgiessen schwer. Durch den Zusatz des erfindungsgemäßen Öles wird der Zerfall nach dem Abgießen wesentlich gefördert. Es wird so Putzarbeit vermindert.Cores with inorganic binders disintegrate after pouring heavy. The addition of the oil according to the invention reduces the disintegration after pouring off significantly promoted. This reduces cleaning work.

Insgesamt gesehen ist festzustellen, daß sich die Zugabe von Ö1, das im wesentlichen aus schweren Kohlenwasserstoffen bet steht, bei den verschiedenen Kernsanden vorteilhaft auswirkt.Overall, it can be stated that the addition of oil, the is essentially made up of heavy hydrocarbons, with the various Core sand has a beneficial effect.

Mit ein und demselben Mittel können die verschiedensten gewünschen Eigenschaften gleichzeitig günstig beeinflußt werden.The most varied of wishes can be made with one and the same means Properties can be influenced favorably at the same time.

Claims (2)

PATENTANS PRUCHEPATENTAN'S PRICE 1. Formmasse zum Herstellen von Sandkernen und Sandformen, bestehend aus Sandkdrnern und einem Bindemittel, g e -k e n n z e i c h n e t d u r c h den Zusatz eines oeles, das im wesentlichen aus schweren Kohlenwasserstoffen besteht.1. Molding compound for producing sand cores and sand molds, consisting of made of sand grains and a binding agent, g e -k e nnnn k e i n e t d u r c h den Addition of an oil consisting essentially of heavy hydrocarbons. 2. Formmasse nach Anspruch 1, d a d u r c h g e k e n nz e i c h n e t , daß der olzusatz 0,5 % im Verhältnis zur Gesamtmischung beträgt,2. Molding composition according to claim 1, d a d u r c h g e k e n nz e i c h n e t that the oil addition is 0.5% in relation to the total mixture,
DE19712132536 1971-06-30 1971-06-30 Sand-oil mixtures as mould and core mfg materials - giving increased strength and storage props Pending DE2132536A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19712132536 DE2132536A1 (en) 1971-06-30 1971-06-30 Sand-oil mixtures as mould and core mfg materials - giving increased strength and storage props

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712132536 DE2132536A1 (en) 1971-06-30 1971-06-30 Sand-oil mixtures as mould and core mfg materials - giving increased strength and storage props

Publications (1)

Publication Number Publication Date
DE2132536A1 true DE2132536A1 (en) 1973-01-11

Family

ID=5812255

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19712132536 Pending DE2132536A1 (en) 1971-06-30 1971-06-30 Sand-oil mixtures as mould and core mfg materials - giving increased strength and storage props

Country Status (1)

Country Link
DE (1) DE2132536A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4919193A (en) * 1986-08-14 1990-04-24 Nobuyoshi Sasaki Mold core for investment casting, process for preparing the same and process for preparing mold for investment casting having therewithin said mold core

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4919193A (en) * 1986-08-14 1990-04-24 Nobuyoshi Sasaki Mold core for investment casting, process for preparing the same and process for preparing mold for investment casting having therewithin said mold core

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