EP1064112B1 - Utilisation de fer micace dans la production de moules a couler - Google Patents

Utilisation de fer micace dans la production de moules a couler Download PDF

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Publication number
EP1064112B1
EP1064112B1 EP99909984A EP99909984A EP1064112B1 EP 1064112 B1 EP1064112 B1 EP 1064112B1 EP 99909984 A EP99909984 A EP 99909984A EP 99909984 A EP99909984 A EP 99909984A EP 1064112 B1 EP1064112 B1 EP 1064112B1
Authority
EP
European Patent Office
Prior art keywords
mould material
iron oxide
plate
lamellar structure
cast
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 - Lifetime
Application number
EP99909984A
Other languages
German (de)
English (en)
Other versions
EP1064112A1 (fr
Inventor
Günther POKORNY
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.)
Karntner Montanindustrie GmbH
Original Assignee
Kaerntner Montanindustrie GmbH
KAERNTNER MONTANINDUSTRIE GES
Karntner Montanindustrie GmbH
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 Kaerntner Montanindustrie GmbH, KAERNTNER MONTANINDUSTRIE GES, Karntner Montanindustrie GmbH filed Critical Kaerntner Montanindustrie GmbH
Priority to AT99909984T priority Critical patent/ATE240174T1/de
Publication of EP1064112A1 publication Critical patent/EP1064112A1/fr
Application granted granted Critical
Publication of EP1064112B1 publication Critical patent/EP1064112B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the present invention relates to the use of iron mica for the production of molds, especially lost molds, and cores for casting castings from non-ferrous, Cast iron and cast steel alloys as well as molding compounds containing mica.
  • iron mica can also be used as an additive for moldings for molds and cores, used in entire area of the foundry industry, as well as an additive for exothermic Dining aids are used.
  • a lost form means a sand form, solidified through organic or inorganic binders (e.g. clays, Resins) which can only be used once and after Pouring for casting emptying must be destroyed.
  • organic or inorganic binders e.g. clays, Resins
  • Cores have the task of creating cavities or undercuts in the casting To form outer contours. Differentiates according to their usability analogue to mold production, cores for single use (lost cores, sand cores) and permanent cores (metal cores), that are used repeatedly. Sand cores are separated manufactured interior parts. You will be assembling the Mold inserted, inserted or hung into the outer mold parts. Both lost forms and lost cores become mainly because of this in the foundry industry very large percentage used because it is relatively inexpensive can be produced and the molding material after destruction of the shapes reconditioned and to produce new shapes again can be used.
  • Finishing or blackening are refractory Substances used in liquid or pasty form to produce a thin coating on the mold walls or cores (sand cores, Metal cores) are used and heat-insulating, heat-conducting, have a smoothing, separating or blocking effect. Depending on These coatings are used accordingly and appropriately Additives added.
  • Molds are made with molding materials made from binder (organic or inorganic), mold raw material, water and Mold additives exist. These terms are used in explained the following:
  • All molds are used as the mold in the present description to understand the manufacture of castings, such as Sand mold, Chill mold, die casting mold, ceramic investment mold or shell mold. Only as examples are outer and inner mold parts, Box shapes, boxless shapes, core shapes and mask shapes called.
  • Molding material is the collective name for all dry, moist, pasty or liquid substances for the production of casting molds, which compresses, solidifies or by chemical processes be bound, e.g. Form and core sands, flow sands, form slips and ceramic molding compounds. Acting in the form of raw materials it is natural mineral or synthetic granules or sands that are used to manufacture single use serving forms are used.
  • Binder is understood to mean constituents of molding material, and certain Requirements (moistening, swelling, silicate formation, Polymerization etc.) the bond between the individual grains of sand produce.
  • source binders e.g. Bentonites that swell by adding a mixing liquid
  • ceramic binders e.g. alumina, which solidify through drying or sintering in the heat
  • hydraulic binders e.g. Gypsum or cement that react with a mixing liquid and hardening
  • chemically hardening binders e.g. water glass, Ethyl silicate or synthetic resins
  • molding material means an addition to those containing binder Mold or core sand mixes, which are the performance characteristics improve and / or the interaction between molding material and cast metal.
  • examples are glossy carbon formers, Starches, calcined soda, boric acid, as well as wood and Called peat flour.
  • Defects occurring in castings can be caused by the molding material have (mold-related casting defects), or metallurgical (Microporosity, slag inclusions, perspiration pearls, Shrinkage and stress cracks, segregations etc.) or technologically (Offset, cold casting, dimensional inaccuracy, etc.).
  • iron mica mentioned here is in ISO 10601 (first edition 1993-08-15), the sieve residue of max. 0.1% on the However, 105 ⁇ m sieve is expressly excluded. So is under Iron mica - CAS No. 1317-60-8 - also iron oxide (alpha hematite) to understand that has a higher sieve residue.
  • iron oxide (according to ISO / DIS 1248.2) - mostly as iron oxide red - as a molding additive is known and is considered "state of the art". These are powdery, mostly amorphous, iron oxides of high fineness. The usual additional quantities are approx. 0.5-1%.
  • Mica is dark gray in color with a metallic sheen. Mica shows a platelet-shaped, lamellar structure and is therefore different from natural and synthetic iron oxides. The chemical composition with Fe 2 O 3 applies to both products in pure form.
  • iron mica for the production of Molds especially lost molds and cores for casting of castings from non-ferrous, cast iron and cast steel alloys to use, being used to manufacture the molds and cores used molding material mixture 4 to 90% by mass, preferably 4 up to 50% by mass, in particular 4-20% by mass, of iron mica as a molding additive contains.
  • the use of iron mica for the production of Molded material coatings (finishing / blackening) provided, the Proportion of iron mica 0.1 to 10 mass% in the solid mass of the coating should be.
  • the one used for the application Mold coating is liquid or pasty and contains depending correspondingly less of the carriers used Micaceous iron oxide.
  • the iron mica used according to the invention has the negative Properties of iron oxide red do not show up. As the cause of this The main effect is its platelet-shaped, lamellar View structure that also allows the percentage in the respective molding material mixture compared to iron oxide (Iron oxide red) without negatively affecting the Strength properties of the form / core.
  • Typical casting defects, such as leaf veins, mineralization, pinholes, etc. become clear reduced, the surface quality is improved and the microstructure formation, especially with AlSiMg alloys, taking into account a high packing density of the molding material / iron mica mixture is greatly refined. As a result, they are better mechanical Properties, savings in a subsequent heat treatment as well as lower cleaning costs.
  • iron mica is according to the invention Additive provided for exothermic food aids. Due to the surprising, highly insulating effect of iron mica as pure, binder-free material is such a use of Iron mica is particularly beneficial. Suitable additional amounts are about 0.1 to 20% by mass of iron mica.
  • thermocouples used (they consist of two wires different metals which are welded at the ends) generate by heating the welding point of the "thermocouple" Electricity with a sensitive millivoltmeter that in the Conductor circuit is installed, measured and referred to as thermal voltage becomes. This thermal voltage is a measure of the temperature at the measuring point. Depending on the time, this results in Cooling or heating curves.
  • the thermocouple pairs used were made of platinum-platinum-rhodium with a temperature range from 0 to 1300 ° C and a thermal voltage of 10.5 uV / K.
  • the device according to FIG. 1 proved to be optimal.
  • the basic form 1 consisted of water glass / CO 2 hardened quartz sand, in which a copper tube 2 (diameter 30 mm, wall thickness 1.5 mm) was placed exactly in the middle. This copper tube serves as the actual shape for the cast material 3; The material to be measured was then either poured around the copper pipe into region 4 or compacted as a mixture of molding materials. Thermocouples 5 were used at suitable locations.
  • Copper was used because of this material has good thermal conductivity, so the casting heat well on the transferred to investigated granular substances or mixtures of molding materials becomes. At the same time, the thermal stability should be so large that the copper form does not melt and before especially when measuring loose, pure granular substances Dimensional stability until the end of solidification is guaranteed.
  • the proportions are as a result of the computational simulation the mold filling and solidification processes chosen so that both a constant compression (e.g. only by the Bulk density of the pure substances) as well as a sufficiently sensitive Measurement of the temperature gradient is possible.
  • thermophysical parameters in the computer simulation of the materials used are unconditional prerequisites, but these are with iron mica not available and i.a. determined with these studies data from zircon, chromite and quartz sand used.
  • thermocouples 5 are in the thermal center of the Cast material (GG, G-AlSi7Mg) and in the granular material or in the molding material mixture attached 20 mm from the metal / mold interface and constant in all attempts. All measurements were taken until the end of the experiment with a measuring speed of one value per Second recorded.
  • the properties of iron mica additives of the bentonite-bound molding material is not adversely affected. A significant increase in the amount of binder is not necessary.
  • FIG.7 are the cooling curves of G-AlSi7Mg using of mixture I (M10N) and II (M20N) as well as a comparison of one Quartz sand mixture without iron mica additive (Q1N) for normal Compaction (corresponds to a conventional machine molding shop).
  • the heating curves of the molding material mixtures shown in Fig. 8 during solidification show the same tendency as in Fig. 6, however, the curve is due to binder components and Water addition another.

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

Claims (10)

  1. Utilisation de l'oxyde de fer micacé à structure lamellaire pour produire des moules de coulage, surtout des moules et des noyaux perdus, à liaison organique ou anorganique, pour le coulage de pièces coulées à partir des alliages non ferreux, de fonte et d'acier moulé, caractérisée par le fait que le mélange de matières à mouler utilisé pour produire lesdits moules et noyaux contient comme additif de matière à mouler de 4 à 90% en masse de l'oxyde de fer micacé à structure lamellaire.
  2. Utilisation selon la revendication 1, caractérisée par le fait que le mélange de matières à mouler contient comme additif de matière à mouler de 4 à 50% en masse de l'oxyde de fer micacé à structure lamellaire.
  3. Utilisation selon la revendication 1 ou 2, caractérisée par le fait que le mélange de matières à mouler contient comme additif de matière à mouler de 4 à 20% en masse de l'oxyde de fer micacé à structure lamellaire.
  4. Utilisation de l'oxyde de fer micacé à structure lamellaire pour produire des couvertures en matière à mouler pour des moules et des noyaux, à liaison organique ou anorganique, pour le coulage de pièces coulées à partir des alliages non ferreux, de fonte et d'acier moulé, caractérisée par le fait que le mélange utilisé pour produire la couverture en matière à mouler contient de l'oxyde de fer micacé à structure lamellaire en une quantité de 0,1 à 10% en masse, par rapport à la masse des matières solides de ladite couverture.
  5. Utilisation de l'oxyde de fer micacé à structure lamellaire comme additif pour les aides d'alimentation exothermes.
  6. Mélange pour produire des noyaux et des moules de coulage pour le coulage de pièces coulées à partir des alliages non ferreux, en fonte et d'acier moulé, caractérisé par le fait que le mélange de matières à mouler contient comme additif de matière à mouler de 4 à 90% en masse de l'oxyde de fer micacé à structure lamellaire.
  7. Mélange de matières à mouler selon la revendication 6, caractérisé par le fait que le mélange de matières à mouler contient comme additif de matière à mouler de 4 à 50% en masse de l'oxyde de fer micacé à structure lamellaire.
  8. Mélange de matières à mouler selon la revendication 6, caractérisé par le fait que le mélange de matières à mouler contient comme additif de matière à mouler de 4 à 20% en masse de l'oxyde de fer micacé à structure lamellaire.
  9. Mélange pour produire des couvertures en matière à mouler pour des moules et des noyaux, à liaison organique ou anorganique, pour le coulage de pièces coulées à partir des alliages non ferreux, de fonte et d'acier moulé, caractérisé par le fait que le mélange utilisé pour produire la couverture en matière à mouler contient de l'oxyde de fer micacé à structure lamellaire en une quantité de 0,1 à 10% en masse, par rapport à la masse des matières solides de ladite couverture.
  10. Aide d'alimentation exotherme, caractérisée par le fait qu'elle contient comme additif de 0,1 à 20% en masse de l'oxyde de fer micacé à structure lamellaire en forme non comprimée, exempte de liant.
EP99909984A 1998-03-20 1999-03-17 Utilisation de fer micace dans la production de moules a couler Expired - Lifetime EP1064112B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT99909984T ATE240174T1 (de) 1998-03-20 1999-03-17 Verwendung von eisenglimmer bei der herstellung von gussformen

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT17698 1998-03-20
AT17698U AT2581U1 (de) 1998-03-20 1998-03-20 Verwendung von eisenglimmer bei der herstellung von gussformen
PCT/AT1999/000068 WO1999048634A1 (fr) 1998-03-20 1999-03-17 Utilisation de fer micace dans la production de moules a couler

Publications (2)

Publication Number Publication Date
EP1064112A1 EP1064112A1 (fr) 2001-01-03
EP1064112B1 true EP1064112B1 (fr) 2003-05-14

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EP99909984A Expired - Lifetime EP1064112B1 (fr) 1998-03-20 1999-03-17 Utilisation de fer micace dans la production de moules a couler

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EP (1) EP1064112B1 (fr)
AT (1) AT2581U1 (fr)
AU (1) AU2910799A (fr)
DE (1) DE59905561D1 (fr)
WO (1) WO1999048634A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004042535B4 (de) * 2004-09-02 2019-05-29 Ask Chemicals Gmbh Formstoffmischung zur Herstellung von Gießformen für die Metallverarbeitung, Verfahren und Verwendung
US20100295287A1 (en) 2007-10-26 2010-11-25 Basf Se Security element
US8772371B2 (en) * 2008-05-09 2014-07-08 Basf Se Pearlescent pigments coated with a metal oxide/hydroxide layer and an acrylic copolymer
US8426493B2 (en) * 2009-12-16 2013-04-23 Ask Chemicals L.P. Foundry mixes containing sulfate and/or nitrate salts and their uses
CN105750486A (zh) * 2016-04-27 2016-07-13 霍邱县鑫瑞金属制品有限责任公司 一种镁合金铸造用含纳米活性炭的水基消失模涂料及其制备方法
DE102018004234A1 (de) * 2018-05-25 2019-11-28 Ask Chemicals Gmbh Schlichtezusammensetzung, Verfahren zur Beschichtung einer Gießform und Verwendung der Schlichtezusammensetzung zur Beschichtung einer Gießform

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54147127A (en) * 1978-05-11 1979-11-17 Sougou Imono Sentaa Preventing defects in castings due to nitrogen contained in mold
US4430441A (en) * 1982-01-18 1984-02-07 Zhukovsky Sergei S Cold setting sand for foundry moulds and cores
CN85107187A (zh) * 1985-09-29 1987-07-22 北京钢铁学院 铸件发热冒口套

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Publication number Publication date
DE59905561D1 (de) 2003-06-18
AT2581U1 (de) 1999-01-25
EP1064112A1 (fr) 2001-01-03
WO1999048634A1 (fr) 1999-09-30
AU2910799A (en) 1999-10-18

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