EP1802409B1 - Formstoffmischung zur herstellung von giessformen für die metallverarbeitung - Google Patents

Formstoffmischung zur herstellung von giessformen für die metallverarbeitung Download PDF

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Publication number
EP1802409B1
EP1802409B1 EP05783967A EP05783967A EP1802409B1 EP 1802409 B1 EP1802409 B1 EP 1802409B1 EP 05783967 A EP05783967 A EP 05783967A EP 05783967 A EP05783967 A EP 05783967A EP 1802409 B1 EP1802409 B1 EP 1802409B1
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EP
European Patent Office
Prior art keywords
moulding mixture
casting
molding material
proportion
mold
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EP05783967A
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German (de)
English (en)
French (fr)
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EP1802409A2 (de
Inventor
Günter Weicker
Diether Koch
Jens Müller
Udo Skerdi
Henning Rehse
Anton Gienic
Reinhard Stötzel
Thomas Dünnwald
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ASK Chemicals GmbH
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ASK Chemicals GmbH
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Application filed by ASK Chemicals GmbH filed Critical ASK Chemicals GmbH
Priority to EP11006910.1A priority Critical patent/EP2392424B1/de
Priority to PL11006910T priority patent/PL2392424T3/pl
Priority to PL05783967T priority patent/PL1802409T3/pl
Priority to SI200531505T priority patent/SI1802409T1/sl
Publication of EP1802409A2 publication Critical patent/EP1802409A2/de
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    • 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
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
    • 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
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
    • B22C1/186—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents contaming ammonium or metal silicates, silica sols
    • B22C1/188—Alkali metal silicates
    • 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
    • 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
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents

Definitions

  • the invention relates to a molding material mixture for the production of casting molds for metal processing, which comprises at least one free-flowing refractory molding base material and a water glass-based binder. Furthermore, the invention relates to a method for the production of molds for metal processing using the molding material mixture as well as a mold obtained by the method.
  • Molds for the production of metal bodies are essentially produced in two versions.
  • a first group form the so-called cores or forms. From these, the casting mold is assembled, which essentially represents the negative mold of the casting to be produced.
  • a second group form hollow bodies, so-called feeders, which act as a compensation reservoir. These take up liquid metal, whereby appropriate measures are taken to ensure that the metal lasts longer the liquid phase remains as the metal which is in the mold forming the negative mold. If the metal solidifies in the negative mold, liquid metal can flow out of the compensation reservoir to compensate for the volume contraction that occurs when the metal solidifies.
  • Casting molds are made of a refractory material, such as quartz sand, whose grains are connected after molding of the mold by a suitable binder to ensure sufficient mechanical strength of the mold.
  • a refractory molding material which has been treated with a suitable binder.
  • the refractory molding base material is preferably present in a free-flowing form, so that it can be filled into a suitable mold and compacted there.
  • the binder produces a firm cohesion between the particles of the molding base material, so that the casting mold obtains the required mechanical stability.
  • Molds must meet different requirements. During the casting process itself, they must first of all have sufficient stability and temperature resistance in order to receive the liquid metal in the mold formed from one or more casting molds. After the start of the solidification process, the mechanical stability of the mold is ensured by a solidified metal layer, which forms along the walls of the mold. The material of the casting mold must now decompose under the influence of the heat given off by the metal in such a way that it loses its mechanical strength, that is to say the cohesion between individual particles of the refractory material is removed. This is achieved, for example, by decomposing the binder under heat. After cooling, the solidified casting is shaken, ideally, the material of the casting molds again to a fine Sand breaks down, which can be poured out of the cavities of the metal mold.
  • both organic and inorganic binders can be used, the curing of which can be carried out in each case by cold or hot processes.
  • Cold processes are processes which are carried out essentially at room temperature without heating the casting mold.
  • the curing is usually carried out by a chemical reaction, which is triggered for example by the fact that a gas is passed as a catalyst through the mold to be cured.
  • hot processes the molding material mixture is heated to a sufficiently high temperature after molding to expel, for example, the solvent contained in the binder or to initiate a chemical reaction by which the binder is cured, for example, by crosslinking.
  • organic binders are often used for the production of casting molds, in which the curing reaction is accelerated by a gaseous catalyst or cured by reaction with a gaseous hardener. These methods are referred to as "cold-box" methods.
  • Ashland cold box process An example of the production of molds using organic binders is the so-called Ashland cold box process. It is a two-component system. The first component consists of the solution of a polyol, usually a phenolic resin. The second component is the solution of a polyisocyanate.
  • the curing reaction of polyurethane binders is a polyaddition, ie a reaction without elimination of By-products, such as water.
  • advantages of this cold-box process include good productivity, dimensional accuracy of the molds, and good engineering properties such as the strength of the molds, the processing time of the mixture of mold base and binder, etc.
  • Hot-curing organic processes include the hot-box process based on phenolic or furan resins, the warm box process based on furan resins, and the croning process based on phenolic novolac resins.
  • liquid resins are processed with a latent curing agent which is only effective at elevated temperatures to form a molding material mixture.
  • mold base materials such as quartz, chrome ore, zirconium, etc., are coated at a temperature of about 100 to 160 ° C with a liquid at this temperature phenol novolac resin. Hexamethylenetetramine is added as a reaction partner for the subsequent curing.
  • the shaping and curing take place in heatable tools, which are heated to a temperature of up to 300 ° C.
  • all organic systems have in common that they thermally decompose when the liquid metal is poured into the mold, releasing pollutants such as benzene, toluene, xylenes, phenol, formaldehyde and higher, sometimes unidentified cracking products.
  • pollutants such as benzene, toluene, xylenes, phenol, formaldehyde and higher, sometimes unidentified cracking products.
  • pollutants such as benzene, toluene, xylenes, phenol, formaldehyde and higher, sometimes unidentified cracking products.
  • binder systems which are based on inorganic materials or contain at most a very small proportion of organic compounds.
  • binder systems have been known for some time. Binder systems have been developed which can be cured by the introduction of gases. Such a system is for example in the GB 782,205 described in which an alkali water glass is used as a binder, which can be cured by the introduction of CO 2 . In the DE 199 25 167 will describe an exothermic feeder mass containing an alkali silicate as a binder. Furthermore, binder systems have been developed which are self-curing at room temperature.
  • thermosetting binder systems are for example from US 5,474,606 in which a binder system consisting of alkali water glass and aluminum silicate is described.
  • Inorganic binders have the disadvantage, in comparison to organic binders, that the casting molds produced therefrom have relatively low strengths. This is especially evident immediately after the removal of the mold from the tool. Good strength at this time, however, are particularly important for the production of complicated, thin-walled moldings and their safe handling. The reason for the low strength is primarily that the molds still contain residual water from the binder. Longer dwell times in the hot, closed tool will only be of help, as the water vapor can not escape sufficiently. To complete the drying of the molds as complete as possible will reach in the WO 98/06522 proposed to leave the molding material mixture after molding only in a tempered core box so long that forms a dimensionally stable and sustainable edge shell. After opening the core box, the mold is removed and then completely dried under the action of microwaves. However, the additional drying is complex, prolongs the production time of the molds and contributes, not least by the energy costs, significantly to the increase in the cost of the manufacturing process.
  • an alkali metal hydroxide in particular sodium hydroxide solution
  • a particulate metal oxide which can form a metalate in the presence of the alkali metal hydroxide solution.
  • the particles are dried after a layer of the metal has formed at the edge of the particles. At the core of the particles remains a section in which the metal oxide was not reacted.
  • a dispersed silica or finely divided titanium oxide or zinc oxide is preferably used.
  • WO 94/14555 describes a molding material mixture, which is also suitable for the production of molds and which contains a binder in addition to a refractory molding material, which consists of a phosphate or borate glass, wherein the mixture further contains a finely divided refractory material.
  • a refractory molding material which consists of a phosphate or borate glass
  • the mixture further contains a finely divided refractory material.
  • silicon dioxide can also be used as the refractory material.
  • a molding material mixture for producing metal working molds comprising a refractory molding base, a water glass based binder and a proportion of a particulate metal oxide is known from the JP 52-138434 A which discloses titanium oxide, zinc oxide, iron oxide and aluminosilicates as metal oxides.
  • JP 52-138434 A discloses titanium oxide, zinc oxide, iron oxide and aluminosilicates as metal oxides.
  • synthetic amorphous silica as the particulate metal oxide is not known in the art.
  • the waterglass-based binder system consists of an aqueous alkali silicate solution and a hygroscopic base, such as sodium hydroxide, added in a ratio of 1: 4 to 1: 6.
  • the water glass has a modulus SiO 2 / M 2 O of 2.5 to 3.5 and a solids content of 20 to 40%.
  • the binder system also contains a surface-active substance, such as silicone oil, which has a boiling point ⁇ 250 ° C.
  • the binder system is mixed with a suitable refractory material, such as quartz sand, and then injected into a core box with a core shooter.
  • a suitable refractory material such as quartz sand
  • the hardening of the molding material mixture takes place by removal of the water still contained.
  • the drying or hardening of the casting mold can also take place under the action of microwaves.
  • the previously known molding material mixtures for the production of casting molds still have room for an improvement in the properties, for example, in terms of the strength of the molds produced and in terms of their resistance to atmospheric moisture during storage for a long period. Furthermore, the goal is to achieve a high quality of the surface of the casting after the casting, so that the finishing of the surface can be carried out with little effort.
  • the object of the invention was therefore to provide a molding material mixture for the production of casting molds for metalworking, which comprises at least one refractory molding base material and a water glass-based binder system which enables the production of casting molds. which have high strength both immediately after shaping and during prolonged storage.
  • the molding material mixture should allow the production of casting molds, with which castings can be produced, which have a high quality of the surface, so that only a small finishing of the surfaces is required.
  • a refractory molding base material can be used for the production of molds usual materials. Suitable examples are quartz or zircon sand. Furthermore, fibrous refractory mold bases are suitable, such as chamotte fibers. Other suitable refractory mold bases are, for example, olivine, chrome ore sand, vermiculite.
  • artificial molding materials can also be used as refractory molding base materials, for example aluminum silicate hollow spheres (so-called microspheres), glass beads, glass granules or spherical ceramic molding base materials known under the name "Cerabeads" or "Carboaccucast”.
  • These spherical ceramic mold bases contain as minerals, for example mullite, corundum, ⁇ -cristobalite in different proportions. They contain as essential proportions alumina and silica. Typical compositions contain, for example, Al 2 O 3 and SiO 2 in approximately equal proportions. In addition, other constituents may be present in proportions of ⁇ 10%, such as TiO 2 Fe 2 O 3 .
  • the diameter of the microspheres is preferably less than 1000 ⁇ m, in particular less than 600 ⁇ m.
  • These artificial molding bases are not of natural origin and may have been subjected to a special molding process, such as in the production of aluminum silicate microbubbles, glass beads or spherical ceramic molding bases.
  • Glass materials are particularly preferably used as refractory artificial mold base materials. These are used in particular either as glass beads or as glass granules. Conventional glasses can be used as the glass, with glasses showing a high melting point being preferred. Suitable examples are glass beads and / or glass granules, which is made of glass breakage. Also suitable are borate glasses. The composition of such glasses is exemplified in the table below. Table: Composition of glasses component glass breakage borate glass SiO 2 50 - 80% 50 - 80% Al 2 O 3 0 -15% 0 - 15% Fe 2 O 3 ⁇ 2% ⁇ 2% M II O 0 - 25% 0 - 25% M I 2 O 5 - 25% 1 - 10% B 2 O 3 ⁇ 15% Otherwise. ⁇ 10% ⁇ 10% M II : alkaline earth metal, eg Mg, Ca, Ba M I : alkali metal, eg Na, K
  • glasses listed in the table it is also possible to use other glasses whose content of the abovementioned compounds lies outside the ranges mentioned.
  • special glasses can be used which contain other elements or their oxides in addition to the aforementioned oxides.
  • the diameter of the glass beads is preferably less than 1000 ⁇ m, in particular less than 600 ⁇ m.
  • the preferred proportion of the artificial molding base materials is at least about 3 wt .-%, more preferably at least 5 wt .-%, particularly preferably at least 10 wt .-%, preferably at least about 15 wt .-%, particularly preferably at least about 20 Wt .-%, based on the total amount of refractory molding material.
  • the refractory molding base material preferably has a free-flowing state, so that the molding material mixture according to the invention can be processed in conventional core shooting machines.
  • the molding material mixture according to the invention comprises a water glass-based binder.
  • a water glass while standard water glasses can be used, as they are already used as binders in molding material mixtures. These water glasses contain dissolved sodium or potassium silicates and can be prepared by dissolving glassy potassium and sodium silicates in water.
  • the water glass preferably has a modulus SiO 2 / M 2 O in the range of 1.6 to 4.0, in particular 2.0 to 3.5, wherein M is sodium and / or potassium.
  • the water glasses preferably have a solids content in the range of 30 to 60 wt .-%. The solids content refers to the amount of SiO 2 and M 2 O contained in the water glass.
  • the molding material mixture contains a proportion of a particulate metal oxide which is a particulate synthetic amorphous silica.
  • the particle size of these metal oxides is preferably less than 300 microns, preferably less than 200 microns, more preferably less than 100 microns.
  • the particle size can be determined by sieve analysis.
  • the sieve residue on a sieve with a mesh width of 63 ⁇ m is less than 10% by weight, preferably less than 8% by weight.
  • Precipitated silica is obtained by reaction of an aqueous alkali metal silicate solution with mineral acids. The resulting precipitate is then separated, dried and ground.
  • Fumed silicas are understood to mean silicic acids which are obtained by coagulation from the gas phase at high temperatures.
  • the production of fumed silica can be carried out, for example, by flame hydrolysis of silicon tetrachloride or in an electric arc furnace by reduction of quartz sand with coke or anthracite to silicon monoxide gas with subsequent oxidation to silica.
  • the pyrogenic silicas produced by the arc furnace process may still contain carbon.
  • Precipitated silica and fumed silica are equally well suited for the molding material mixture according to the invention. These silicas are hereinafter referred to as "synthetic amorphous silica”.
  • the molding material mixture according to the invention represents an intensive mixture of at least the constituents mentioned.
  • the particles of the refractory molding material are preferably coated with a layer of the binder.
  • evaporating the water present in the binder about 40 to 70 wt .-%, based on the weight of the binder
  • a solid cohesion between the particles of the refractory base molding material can be achieved.
  • the binder i. the water glass as well as the particulate synthetic amorphous silica is preferably contained in the molding material mixture in a proportion of less than 20% by weight. If massive molding base materials are used, such as quartz sand, the binder is preferably present in a proportion of less than 10% by weight, preferably less than 8% by weight, more preferably less than 5% by weight. If refractory mold bases are used which have a low density, such as the hollow microspheres described above, the proportion of binder increases accordingly.
  • the particulate synthetic amorphous silica based on the weight of the binder, is preferably contained in a proportion of 2 to 60% by weight, preferably between 3 and 50% by weight, especially preferably between 4 and 40% by weight.
  • the ratio of water glass to particulate synthetic amorphous silica can be varied within wide ranges. This offers the advantage of improving the initial strength of the casting mold, ie the strength immediately after removal from the hot tool and the moisture resistance, without significantly affecting the final strengths, ie the strengths after cooling of the casting mold, compared to a waterglass binder without amorphous silica. This is of great interest especially in light metal casting.
  • high initial strengths are desired in order to be able to easily transport these after the production of the casting mold or to assemble them with other casting molds.
  • the hardness after curing should not be too high to cause difficulties Binder decomposition after casting to avoid, ie the molding material should be able to be easily removed from the cavities of the mold after casting.
  • the molding material contained in the molding material mixture according to the invention may contain at least a proportion of hollow microspheres in one embodiment of the invention.
  • the diameter of the hollow microspheres is usually in the range of 5 to 500 ⁇ m, preferably in the range of 10 to 350 ⁇ m, and the thickness of the shell is usually in the range of 5 to 15% of the diameter of the microspheres.
  • These microspheres have a very low specific gravity, so that the molds produced using hollow microspheres have a low weight.
  • Particularly advantageous is the insulating effect of the hollow microspheres.
  • the hollow microspheres are therefore used in particular for the production of molds, if they are to have an increased insulating effect.
  • Such casting molds are, for example, the feeders already described in the introduction, which act as a compensation reservoir and contain liquid metal, wherein the metal should be kept in a liquid state until the metal filled into the mold has solidified.
  • Another application of casting molds containing hollow microspheres are, for example, sections of a casting mold which correspond to particularly thin-walled sections of the finished casting mold. The insulating effect of the hollow microspheres ensures that the metal in the thin-walled sections does not prematurely solidify and thus clog the paths within the casting mold.
  • the binder due to the low density of these hollow microspheres, is preferably used in a proportion in the range of preferably less than 20% by weight, particularly preferably in the range from 10 to 18% by weight.
  • the hollow microspheres are preferably made of an aluminum silicate. These aluminum silicate microbubbles preferably have an aluminum oxide content of more than 20% by weight, but may also have a content of more than 40% by weight.
  • Such hollow microspheres are for example from Omega Minerals Germany GmbH, Norderstedt, under the names OmegaSpheres ® SG with an alumina content of about 28 - 33%, Omega-Spheres ® WSG with an alumina content of about 35 - 39% and E-Spheres ® with an aluminum oxide content of about 43% in the trade. Corresponding products are available from the PQ Corporation (USA) under the name "Extendospheres ®".
  • hollow microspheres are used as the refractory molding base, which are made of glass.
  • the hollow microspheres consist of a borosilicate glass.
  • the borosilicate glass has a proportion of boron, calculated as B 2 O 3 , of more than 3% by weight.
  • the proportion of hollow microspheres is preferably chosen to be less than 20% by weight, based on the molding material mixture.
  • a small proportion is preferably selected. This is preferably less than 5 wt .-%, preferably less than 3 wt .-%, and is more preferably in the range of 0.01 to 2 wt .-%.
  • the molding material mixture according to the invention in a preferred embodiment contains at least a proportion of glass granules and / or glass beads as refractory molding base material.
  • the molding material mixture is an exothermic molding material mixture, which is suitable, for example, for the production of exothermic feeders.
  • the oxidizable metals preferably form a proportion of 15 to 35 wt .-%.
  • the oxidizing agent is preferably added in a proportion of 20 to 30 wt .-%, based on the molding material mixture.
  • Suitable oxidizable metals are, for example, aluminum or magnesium.
  • Suitable oxidizing agents are, for example, iron oxide or potassium nitrate.
  • the molding material mixture according to the invention contains a proportion of platelet-shaped lubricants, in particular graphite or MoS 2.
  • platelet-shaped lubricants in particular graphite or MoS 2.
  • the amount of added platelet-shaped lubricant, in particular graphite is preferably 0.1 wt .-% to 1 wt .-%, based on the molding material.
  • the molding material mixture according to the invention may also comprise further additives.
  • internal release agents can be added which facilitate the separation of the molds from the mold. Suitable internal release agents are, for example, calcium stearate, fatty acid esters, waxes, natural resins or special alkyd resins.
  • silanes can also be added to the molding material mixture according to the invention.
  • the molding material mixture according to the invention contains an organic additive which has a melting point in the range from 40 to 180 ° C., preferably from 50 to 175 ° C., ie is solid at room temperature.
  • Organic additives are understood to be compounds whose molecular skeleton is composed predominantly of carbon atoms, that is, for example, organic polymers.
  • the inventors assume that at least some of the organic additives are burnt during the casting process, thereby creating a thin gas cushion between the liquid metal and the molding material forming the wall of the casting mold and thus a reaction between the liquid metal and the molding material is prevented. Further, the inventors believe that some of the organic additives under the reducing atmosphere of the casting form a thin layer of so-called lustrous carbon, which also prevents reaction between metal and molding material. As a further advantageous effect, an increase in the strength of the casting mold after curing can be achieved by adding the organic additives.
  • the organic additives are preferably used in an amount of 0.01 to 1.5% by weight, more preferably 0.05 to 1.3% by weight, particularly preferably 0.1 to 1.0% by weight, respectively based on the molding material added.
  • Suitable organic additives are, for example, phenol-formaldehyde resins, such as novolacs, epoxy resins, such as bisphenol A epoxy resins, bisphenol F epoxy resins or epoxidized novolacs, polyols, such as Polyethylene glycols or polypropylene glycols, polyolefins such as polyethylene or polypropylene, copolymers of olefins such as ethylene or propylene, and other comonomers such as vinyl acetate, polyamides such as polyamide-6, polyamide-12 or polyamide-6,6, natural resins such for example, gum rosin, fatty acid esters such as cetyl palmitate, fatty acid amides such as ethylenediamine bisstearamide, and metal soaps such as stearates or oleates of di- or tri-valent metals.
  • the organic additives can be contained both as
  • the molding material mixture according to the invention contains a proportion of at least one silane.
  • Suitable silanes are, for example, aminosilanes, epoxysilanes, mercaptosilanes, hydroxysilanes and ureidosilanes.
  • silanes examples include ⁇ -aminopropyltrimethoxysilane, ⁇ -hydroxypropyltrimethoxysilane, 3-ureidopropyltriethoxysilane, ⁇ -mercaptopropyltrimethoxysilane, ⁇ -glycidoxypropyltrimethoxysilane, ⁇ - (3,4-epoxycyclohexyl) trimethoxysilane and N- ⁇ (aminoethyl) - ⁇ -aminopropyltrimethoxysilane.
  • silane Based on the particulate metal oxide typically about 5 to 50% silane are used, preferably about 7 to 45%, more preferably about 10 to 40%.
  • the procedure is generally such that initially the refractory molding base material is introduced and then the binder is added with stirring.
  • the water glass and the particulate synthetic amorphous silica can be added per se in any order.
  • the molding material mixture is then brought into the desired shape.
  • customary methods are used for the shaping.
  • the molding material mixture can be shot by means of a core shooting machine with the aid of compressed air into the mold.
  • the molding material mixture is then cured by supplying heat in order to evaporate the water contained in the binder.
  • the heating can be done for example in the mold. It is possible to fully cure the mold already in the mold. But it is also possible to auspatizten the mold only in its edge region, so that it has sufficient strength to be removed from the mold can.
  • the casting mold can then be completely finished be cured by their further water is withdrawn. This can be done for example in an oven.
  • the dehydration can for example also be done by the water is evaporated at reduced pressure.
  • the curing of the molds can be accelerated by blowing heated air into the mold.
  • a rapid removal of the water contained in the binder is achieved, whereby the mold is solidified in suitable periods for industrial use.
  • the temperature of the injected air is preferably 100 ° C to 180 ° C, particularly preferably 120 ° C to 150 ° C.
  • the flow rate of the heated air is preferably adjusted to cure the mold in periods suitable for industrial use. The periods depend on the size of the molds produced. It is desirable to cure in less than 5 minutes, preferably less than 2 minutes. For very large molds, however, longer periods may be required.
  • the removal of the water from the molding material mixture can also be carried out in such a way that the heating of the molding material mixture is effected by irradiation of microwaves.
  • the irradiation of the microwaves is preferably carried out after the casting mold has been removed from the molding tool.
  • the casting mold must already have sufficient strength. As already explained, this can be achieved, for example, by curing at least one outer shell of the casting mold already in the molding tool.
  • the flowability of the molding material mixture according to the invention can be improved by the addition of platelet-shaped lubricants, in particular graphite and / or MoS 2 .
  • the platy Lubricant, in particular graphite thereby be added separately from the two binder components of the molding material mixture.
  • the addition of the organic additive per se can be carried out at any time during the preparation of the molding material mixture.
  • the addition of the organic additive can be carried out in bulk or in the form of a solution.
  • Water-soluble organic additives can be used in the form of an aqueous solution. If the organic additives are soluble in the binder and are stable in storage over several months in the binder, they can also be dissolved in the binder and thus added to the molding material together with it. Water-insoluble additives may be used in the form of a dispersion or a paste. The dispersions or pastes preferably contain water as solvent. As such, solutions or pastes of the organic additives can also be prepared in organic solvents. However, if a solvent is used for the addition of the organic additives, water is preferably used.
  • the addition of the organic additives is carried out as a powder or as a short fiber, wherein the average particle size or the fiber length is preferably selected so that it does not exceed the size of the molding material particles.
  • the organic additives can be sieved through a sieve with the mesh size of about 0.3 mm.
  • the particulate Metal oxide and the organic or the additives preferably not separately added to the molding sand, but mixed in advance.
  • the silanes are usually added in the form that they are incorporated into the binder in advance.
  • the silanes can also be added to the molding material as a separate component.
  • it is particularly advantageous to silanize the particulate metal oxide i. To mix the metal oxide with the silane, so that its surface is provided with a thin silane layer. If one uses the thus pretreated particulate metal oxide, one finds compared to the untreated metal oxide increased strengths and an improved resistance to high humidity. If, as described, an organic additive is added to the molding material mixture or the particulate metal oxide, it is expedient to do so before the silanization.
  • the inventive method is in itself suitable for the production of all casting molds customary for metal casting, that is to say, for example, of cores and molds.
  • the inventive method for the production of feeders is.
  • the molds produced from the molding material mixture according to the invention or with the inventive method have a high strength immediately after the production, without the strength of the molds after curing is so high that difficulties after the production of the casting occur during removal of the mold. Furthermore, these molds have a high stability at elevated humidity, ie the molds can be stored easily for a long time.
  • Another object of the invention is therefore a casting mold which has been obtained by the process according to the invention described above.
  • the casting mold according to the invention is generally suitable for metal casting, in particular light metal casting. Particularly advantageous results are obtained in aluminum casting.
  • Georg Fischer test bars are cuboid test bars measuring 150 mm x 22.36 mm x 22.36 mm.
  • test bars were placed in a Georg Fischer strength testing machine equipped with a 3-point bending device (DISA Industrie AG, Schaffhausen, CH) and the force was measured which resulted in the breakage of the test bars.
  • Examples 1.4 to 1.7 increasing amounts of amorphous silica, which had been produced in the electric arc furnace, were added to the molding material mixtures. The amount of mold base and water glass was kept constant.
  • Comparative Example 1.1 a molding material mixture was prepared, which had the same composition as the molding material mixtures of Examples 1.4 to 1.7, but no amorphous silica was added.
  • the results from Table 2 show that the addition of amorphous, arc-prepared silica markedly increases the flexural strength of the test bars.
  • the flexural strength of the test bars increases particularly strongly in the case of a measurement after storage in the climatic cabinet at elevated air humidity. This means that the test bars produced with the molding material mixture according to the invention substantially retain their strength even after prolonged storage.
  • Increasing amounts of added amorphous silica lead to increasing flexural strengths.
  • the flexural strengths measured after storage in the climatic chamber, a strong increase in the flexural strengths is observed initially, which flattens out as the amount of added amorphous silicon dioxide increases.
  • Examples 1.4, 1.8 and 1.9 equal amounts of mold base, water glass and amorphous silicon dioxide (produced in the arc) were processed, but the ratio SiO 2 : M 2 O of the alkali water glass was changed.
  • the comparative examples 1.1, 1.2 and 1.3 in each case equal amounts of mold base material and water glass were processed, but also the ratio SiO 2 : M 2 O of the alkali water glass was varied.
  • the amorphous silica produced in the arc furnace is effective regardless of the ratio SiO 2 : M 2 O of the alkali water glass.
  • Examples 1.4, 1.10 and 1.11 equal amounts of mold base, water glass and amorphous silica were processed respectively, but the nature of the synthetic amorphous silica was varied.
  • the flexural strengths listed in Table 2 show that precipitated and pyrogenic, by Flame hydrolysis produced silicas are as effective as in the arc furnace produced amorphous silica.
  • the hot strengths and high humidity resistance can be improved without simultaneously increasing the cold strengths.
  • Examples 3.3-3.5 show that the addition of silane has a positive effect on the strengths, especially with respect to the resistance to high humidity.
  • the positive effect of the amorphous silica is not limited to quartz sand as a molding material, but that it also increases the strength of other molding materials, e.g. Microspheres, ceramic balls and glass beads.
  • composition was used as exothermic composition: Aluminum (0.063 - 0.5 mm grain size) 25% potassium nitrate 22% Micro hollow spheres (Omegaspheres ® WSG der 44% Company Omega Minerals Germany GmbH) Refractory surcharge (fireclay) 9%
  • the amorphous silica also increases strength in the case of exothermic compositions as a molding material.
  • the flowability of the molding material mixtures was determined by means of the degree of filling of the in Fig. 1 determined mold 1 determined.
  • the mold 1 consists of two halves, which can be connected to each other, so that a cavity 2 is formed.
  • the cavity 2 comprises three chambers 2a, 2b and 2c of circular cross-section having a diameter of 100 mm and a height of 30 mm.
  • the chambers 2a, 2b and 2c are each connected by circular openings 3a, 3b having a diameter of 15 mm.
  • the circular openings are made in partitions 4a, 4b, which have a thickness of 8 mm.
  • the openings 3a, 3b are each 37.5 mm to the central axis 6 offset at a maximum distance from each other.
  • an access 5 through which the molding material mixture can be filled.
  • the access 5 has a circular cross section with a diameter of 15 mm.
  • a vent opening 7 is further provided, which has a circular cross-section with a diameter of 9 mm and which is provided with a so-called slot nozzle.
  • the mold 1 is used for filling in a core shooting machine.
  • the determined weights of the moldings are summarized in Table 12.
  • Table 11 ⁇ / u> Composition of the molding material mixtures Quartz sand H 32 Alkaline water glass a) amorphous silica b) graphite 6.1 100 GT 2.5 GT 0.2 GT - Comparison, not according to the invention 6.2 100 GT 2.5 GT 0.2 GT 0.2 GT inventively 6.3 100 GT 2.5 GT 0.2 GT 0.2 GT inventively 6.4 100 GT 2.5 GT 0.2 GT 1.0 GT inventively a) Alkali water glass with modulus SiO 2 : M 2 O of approx. 2.3 b) Elkem Microsilica 971 Weight of the moldings Weight [g] 6.1 512 Comparison, not according to the invention 6.2 534 inventively 6.3 564 inventively 6.4 588 inventively
  • composition of the investigated molding material mixtures is listed in Table 14.
  • Table 14 shows that the addition of organic additives improves the casting surface.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Dental Prosthetics (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Lubricants (AREA)
  • Compositions Of Oxide Ceramics (AREA)
EP05783967A 2004-09-02 2005-09-02 Formstoffmischung zur herstellung von giessformen für die metallverarbeitung Revoked EP1802409B1 (de)

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EP11006910.1A EP2392424B1 (de) 2004-09-02 2005-09-02 Verfahren zur Herstellung von Giessformen für die Metallverarbeitung, Giessformen hergestellt nach dem Verfahren und deren Verwendung
PL11006910T PL2392424T3 (pl) 2004-09-02 2005-09-02 Sposób wytwarzania form odlewniczych do przetwarzania metali, formy odlewnicze wytworzone według tego sposobu i ich zastosowanie
PL05783967T PL1802409T3 (pl) 2004-09-02 2005-09-02 Mieszanka masy formierskiej do wytwarzania form odlewniczych do przetwarzania metali
SI200531505T SI1802409T1 (sl) 2004-09-02 2005-09-02 Mešanica za proizvodnjo kalupov za predelavo kovin

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PCT/EP2005/009470 WO2006024540A2 (de) 2004-09-02 2005-09-02 Formstoffmischung zur herstellung von giessformen für die metallverarbeitung

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DK1802409T3 (da) 2012-04-16
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PT1802409E (pt) 2012-05-08
MX2007002585A (es) 2007-07-13
WO2006024540A2 (de) 2006-03-09
WO2006024540A3 (de) 2006-07-13
KR101301829B1 (ko) 2013-08-30
JP5102619B2 (ja) 2012-12-19
AU2005279301A1 (en) 2006-03-09
CN100563869C (zh) 2009-12-02
CA2578437C (en) 2013-01-29
CA2578437A1 (en) 2006-03-09
DE102004042535A1 (de) 2006-03-09
EP2392424B1 (de) 2019-11-06
PL2392424T3 (pl) 2020-05-18
HUE047434T2 (hu) 2020-04-28
US7770629B2 (en) 2010-08-10
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ATE542619T1 (de) 2012-02-15
HRP20120325T1 (hr) 2012-05-31
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ES2380349T3 (es) 2012-05-10
IL181594A0 (en) 2007-07-04
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KR20070057233A (ko) 2007-06-04
EP2392424A1 (de) 2011-12-07
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US20080099180A1 (en) 2008-05-01
ZA200701859B (en) 2008-07-30
BRPI0514810A (pt) 2008-06-24
SI2392424T1 (sl) 2020-03-31
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NO20071755L (no) 2007-05-21

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