WO2009103539A1 - Masselotte dotée à l’intérieur d’un noyau de cassage - Google Patents

Masselotte dotée à l’intérieur d’un noyau de cassage Download PDF

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Publication number
WO2009103539A1
WO2009103539A1 PCT/EP2009/001204 EP2009001204W WO2009103539A1 WO 2009103539 A1 WO2009103539 A1 WO 2009103539A1 EP 2009001204 W EP2009001204 W EP 2009001204W WO 2009103539 A1 WO2009103539 A1 WO 2009103539A1
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WO
WIPO (PCT)
Prior art keywords
feeder
cap
breaker core
projection
core
Prior art date
Application number
PCT/EP2009/001204
Other languages
German (de)
English (en)
Inventor
Udo Skerdi
Karl-Heinz Baum
Original Assignee
AS Lüngen 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 AS Lüngen GmbH filed Critical AS Lüngen GmbH
Publication of WO2009103539A1 publication Critical patent/WO2009103539A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/088—Feeder heads

Definitions

  • the invention relates to a method for producing a feeder, and a feeder, as can be obtained with the method.
  • feeders ie open or closed spaces in or on the mold are regularly used to compensate for the volume deficit in the solidification of the cast and prevent voids formation in the cast piece.
  • the feeders are connected to the cast piece or the endangered cast piece area and are usually arranged above or on the side of the mold cavity.
  • a model is first produced which substantially corresponds in shape to the metal casting to be produced. Feeders and feeders are attached to this model. Subsequently, the model is surrounded in a molding box with molding sand.
  • the molding sand is compacted and then cured. After curing, the mold is removed from the molding box.
  • the casting mold has a mold cavity or, if the casting mold is made up of a plurality of part pieces, a part of the mold cavity which substantially corresponds to a negative mold of the metal casting to be produced.
  • liquid metal is introduced into the mold cavity of the casting mold. The incoming liquid metal displaces the air from the mold cavity. The air escapes through openings provided in the casting mold or through porous sections of the casting mold, for example through the wall of a feeder.
  • the feeders therefore preferably have a sufficient porosity, so that on the one hand during the filling of the liquid metal can flow into the feeder and on the other hand can nachstr ⁇ men the still liquid metal from the feeder into the mold cavity during cooling and solidification of the metal in the mold cavity of the mold. After cooling the casting, the mold is removed.
  • the Gußstuck usually still requires a post-processing, in which, for example, the surface is processed or unnecessary extensions, which have remained, for example, from the supplies of liquid metal removed.
  • Feeders are also dimensioned so that the liquid metal does not completely drain out of the feeder cavity when the castings solidify. Thus, there remains a solidified residue of the metal filling of the feeder, a so-called residual feeder, which must be separated from the casting.
  • refractive cores are used. These are usually annular bodies, which are made of a refractory material and have in their center a passage opening, which has a ge has a smaller diameter than the feeder cavity. At the residual feeder remaining on the casting, a constriction correspondingly forms, which acts as a breaking edge, so that the metal residue can be removed from the casting in a relatively simple and controlled manner.
  • a feeder which is designed as a cavity in the mold, wherein in the cavity, a clay pot is used, the bottom of which has an opening which is substantially smaller than the diameter of the bottom or the clay pot.
  • a suitable clay pot is for example a flower pot.
  • DE 35 25 637 A1 describes a breaker core for feeders, which essentially has the shape of a circular disk with a central passage.
  • the breaker core contains a reinforcement of a metal sheet, preferably a sheet of unalloyed iron, which is coated with a refractory material.
  • the coating can be made very thin, so that a low quenching effect is achieved upon contact of the liquid metal with the breaker core, so that clogging of the passage is prevented by solidified metal.
  • a feeder is described with a breaker core, wherein the feeder comprises in a section along its vertical axis sections which are each V-shaped - -
  • the bottom of the feeder has an outer diameter D4 and has in its center an outlet opening with an inner diameter D2.
  • a breaker core connects, which has a füro réelle with an inner diameter D3, which corresponds substantially to the inner diameter D2 of the Auslasso réelle.
  • the breaker core has an outer diameter D5 which is selected to be larger than the outer diameter D4 of the feeder bottom.
  • Feeders which comprise a breaker core have hitherto usually been produced in such a way that first a feeder cap and a break core are produced in separate steps.
  • the feeder cap has on its lower side a flat base, which surrounds a Whyro réelle that opens a arranged in the feeder cap feeder cavity to the outside.
  • the most disk-shaped breaking core also has a flat surface which surrounds the füro réelle.
  • the breaker core is now attached to the underside of the feeder cap by means of a suitable adhesive, so that the two flat surfaces described abut each other to the plant.
  • a suitable adhesive both organic and inorganic adhesives can be used. Although the use of organic adhesives, a rapid connection of the refractive core and the feeder head can be achieved.
  • the organic adhesive burns due to the heat of the liquid metal, causing smoke to form.
  • the smoke contains harmful compounds, so that, for example, extraction systems have to be provided with which the smoke can be removed.
  • inorganic adhesives for example water
  • the production of the glued connection still requires several production steps.
  • a breaker core for casting molds which can be frictionally fastened to a feeder cap, so that the use of an adhesive can be dispensed with.
  • the breaker core consists of a base, for example a circular disc, in the center of which a passage opening is arranged. Disposed on the disk-shaped base is a lip which is connected to the base in one piece and which circulates around the latter at a distance from the passage opening. The lip is in the shape of a cone, i. their outer surface runs perpendicular to the base obliquely inside.
  • the breaker core may be secured to a feeder cap such that the lip circulating around the port is inserted into the feeder throat of the feeder cavity located in the feeder cap. The outer wall of the lip may become wedged in the mouth of the feeder so that the lip is frictionally engaged with the mouth of the feeder.
  • an additional attachment of the refractive core can be made by an adhesive.
  • the breaker core described in DE 28 08 784 A is fastened in the feeder cap by wedging the lip provided on the breaker core in the mouth of the feeder.
  • this results in only a relatively small contact surface between the lip and feeder cap, so that the connection is not particularly strong. If the feeder is therefore exposed to vibrations, for example during transport, the breaker core easily falls off again from the feeder cap. If the contact area between the lip and the wall of the feeder cavity is increased, for example by forcefully inserting the lip into the opening of the feeder so that it is deformed at its edge, the lip can break, so that the connection between the breaker core and the feeder core is broken. rather weaker. The breaker core then falls off again from the feeder cap.
  • a breaker core is used on which a projection is arranged, which is adapted in its dimensions to the mouth of a feeder cavity provided in a feeder cap.
  • this projection is already introduced at a time of manufacture of the feeder in the Lucasro réelle to which the feeder cap is not or only partially cured according to a preferred embodiment.
  • the wall of the feeder cap is still yielding and can therefore better adapt to the outer surfaces of the feeder.
  • the outer wall of the projection can therefore adapt very closely to the wall of the feeder cavity, so that a very intimate contact and thus also a stable frictional connection can form.
  • connection between the breaker core and the feeder cap is so strong that even vibrations that occur during transport do not cause the breaker core to detach from the feeder cap. Furthermore, the feeder can be produced very simply and efficiently, since instead of an adhesive connection, as has hitherto been customary in the industrial production of such feeders, only one plugging operation is carried out.
  • the projection is provided on the feeder head and is inserted into the passage opening of the breaker core, so that also a stable attachment of the breaker core is achieved at the feeder head.
  • the projection is provided on the breaker core.
  • each sleeve can be attached to the erfmdungsgeschreiben method on the feeder cap.
  • the erfmdungsgedorfe method is carried out in such a way that:
  • At least one molding material mixture comprising at least one refractory molding material and a binder; forming from the at least one molding material mixture an uncured feeder cap surrounding a feeder cavity opened to at least one side to a feeder opening;
  • the outer surface of the at least one projection comes to lie fully flattened on an inner surface of the feeder cavity, which is adjacent to the Speisso réelle, or
  • the outer surface of the at least one projection comes to lie fully flat against a surface of the passage opening of the breaker core
  • Feeder cap and breaker core are merged into a feeder
  • the feeder is being cured.
  • a molding material mixture is provided from which the feeder cap is made.
  • the molding material mixture contains as essential constituents a refractory molding material and a binder.
  • a refractory molding material can be used for the production of feeders usual materials. Suitable examples are quartz or zircon sand. Furthermore, fibrous refractory molding materials are also suitable, such as - -
  • refractory molding materials are, for example, olivine, chrome ore sand and vermiculite. If the feeder to have insulating properties, so refractory molding materials can be used, which have a low thermal conductivity. This can be achieved, for example, by the refractory molding material hollow microspheres or a porous refractory material, such as. Pumice or other foamed inorganic materials such. B. contains aerated concrete.
  • the refractory molding material therefore preferably comprises at least one fraction of a refractory molding material which has cavities and which is highly heat-insulating due to the gas enclosed in the cavities.
  • the refractory molding material comprises a proportion of refractory hollow microspheres.
  • Such refractory hollow microspheres preferably have a shell of an aluminum silicate.
  • Such aluminosilicate hollow microspheres can be obtained, for example, from fly ash, which is separated from combustion exhaust gases in industrial plants.
  • the microholes have a diameter of preferably less than 3 mm, more preferably less than 1 mm.
  • the wall thickness of the hollow microspheres is preferably 5 to 20% of the diameter of the hollow microspheres.
  • the composition of the aluminosilicate hollow microspheres can vary within wide ranges.
  • the aluminum content calculated as Al 2 O 3 and based on the weight of the hollow microspheres, is between 25 and 75%, preferably 30 and 50%.
  • the proportion of hollow microspheres on the refractory molding material is preferably greater than 30%, preferably greater than 40%, more preferably selected in the range of 60 to 95%, particularly preferably in the range of 65 to 90 wt .-%.
  • Such aluminum silicate hollow spheres (so-called. Microsphe- res) offered example, under the designation "Cerabeads ®" or "Carboaccucast ®”.
  • the refractory molding material may also contain a proportion of an oxidisable metal, such as aluminum or magnesium, as well as a suitable oxidizing agent, such as, for example, an alkali nitrate or iron oxide.
  • the proportion of the oxidisable metal in the molding material mixture is preferably in the range of 15 to 35% by weight, preferably 20 to 25% by weight, and the proportion of the oxidizing agent in the molding compound is preferably in the range of 8 to 20% by weight. -%, preferably 10 to 15 wt .-% selected.
  • the materials for the production of feeders are known per se to those skilled in the art.
  • any desired binders can be added to the molding material mixture.
  • organic polymers can be used as binders, which are cured by suitable methods.
  • binders based on organic polymers are cold box binders, hot box binders or resin binders.
  • a cold-box binder When using a cold-box binder, it is preferably selected from the group of phenol-urethane resins activated by amines, epoxy-acrylic resins which can be activated by SO 2 , alkaline phenolic resins characterized by CO 2 or Methyl formate can be activated, as well as water glass, which can be activated by CO 2 .
  • phenol-urethane resins activated by amines epoxy-acrylic resins which can be activated by SO 2
  • alkaline phenolic resins characterized by CO 2 or Methyl formate can be activated
  • water glass which can be activated by CO 2 .
  • Water glass is particularly preferably used as a binder.
  • Conventional water glasses can be used as the water glass, as they are already used as binders in molding mixtures for the foundry industry. 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 module - -
  • the water glasses preferably have a solids content in the range of 20 to 50 wt .-%. Furthermore, solid water glass can also be used.
  • the proportion of the binder in the molding material mixture is preferably selected in the range of 2 to 20 wt .-%, preferably 5 to 15 wt .-%.
  • the molding material mixture may contain a proportion of a particulate metal oxide selected from the group of silica, alumina, titania and zinc oxide.
  • the particle size of these metal oxides is preferably less than 300 .mu.m, preferably less than 200 .mu.m, more preferably less than 100 .mu.m, and is more preferably in the range of 10 to 90 .mu.m.
  • the particle size can be determined by sieve analysis. Particularly preferably, 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.
  • particulate metal oxide silica is used, in which case synthetically produced amorphous silica is particularly preferred.
  • Precipitated silica is obtained by reaction of an aqueous alkali 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 after the electric arc furnace process produced pyrogenic silicas may still contain carbon.
  • Precipitated silica and fumed silica are equally well suited for the molding material mixture. These silicas are hereinafter referred to as "synthetic amorphous silica”.
  • the particulate metal oxide in particular the synthetic amorphous silica, based on the weight of the binder, preferably in a proportion of 2 to 60 wt .-%, preferably between 3 and 50 wt .-%, particularly preferably between 4 and 40 wt .-% contain.
  • a feeder cap From the molding material mixture is then prepared by conventional methods, a feeder cap.
  • the geometry of the feeder cap is not subject to any restrictions per se.
  • the feeder cap can be constructed in one or more parts, wherein a one-piece feeder cap is preferred.
  • the feeder cap is rotationally symmetrical to its longitudinal axis, so that there are no restrictions on the positioning of the feeder on a model of a casting mold in relation to the orientation to its longitudinal axis.
  • the feeder cap comprises a feeder cavity in which the liquid metal is taken during the metal casting. This feeder cavity has a feeder opening through which the connection to a mold cavity of a mold can be made.
  • the cross-section of the Speiso réelle is preferably circular. However, other cross sections, for example rectangular or hexagonal cross sections may also be provided.
  • the feeder cavity can only be open to one side. But it is also possible to provide a plurality of openings, for example, a second opening, which is arranged opposite the Speiso réelle.
  • the shaping is carried out by conventional methods and in conventional devices.
  • the molding material mixture can be shot by compressed air into a corresponding shape. If the blank of the feeder cap already has sufficient strength after shaping, it can be removed directly from the mold. Usually, however, the strength of the blank is not sufficient, so that the feeder cap is initially partially cured. If water glass is used as the binder, this can be achieved, for example, by passing carbon dioxide through the blank after shaping of the molding material, thereby solidifying the molding material mixture.
  • the partial solidification of the blank can also be achieved by heating the feeder cap, for example to temperatures of 120 to 200 ° C., so that moisture is removed from the water glass.
  • hot air can also be passed through the blank of the feeder cap.
  • the temperature of the injected air is preferably 100 0 C to 180 0 C, particularly preferably 120 0 C to 150 0 C.
  • a breaker core which has a passage opening.
  • the breaker core preferably has the shape of a disk-shaped ring.
  • the passage opening therefore preferably has a circular cross-section, as does the opening of the feed.
  • the breaker core preferably consists of a refractory material, wherein the same materials and binders can be used as have already been described in the manufacture of the feeder cap.
  • the break core may also be made of other materials, such as steel, cardboard, paper, wood, plastics or composite materials.
  • the breaker core is completely cured, so that it has a high strength.
  • a projection is provided either on the breaker core or on the feeder cap, which projection is matched to the feeder opening or to the passage opening of the breaker core, so that the projection m can be inserted into the feeder opening or into the passage opening.
  • the outer surface of the projection is arranged so that it comes into contact with the wall of the feeder cavity or the füro réelle when plugged.
  • the composite After pinning core and feeder cap, the composite is completely cured.
  • the unit formed from the breaker core and the feeder cap can, for example, be transferred into an oven and heated. The temperature is preferably selected in the range of 120 to 200 0 C. The water glass is then deprived of further water, so that a complete curing takes place. Hot air can also be blown into the oven to aid drainage. The curing can also be done, for example, by the unit formed from feeder cap and breaker core is treated with microwave radiation, so that the water glass is withdrawn water.
  • the projection After curing, the projection is firmly anchored in the associated opening, so that, for example, during transport of the feeder or in the usual treatment in the production of molds this does not disintegrate into its individual parts. It it is not necessary that an adhesive is used for the attachment of the refractive core in order to achieve sufficient fixation of the refractive core on the feeder cap.
  • the breaker core may also be made of a molding material mixture, which may be the same or different from the molding material mixture for the feeder cap.
  • the breaker core is already fully cured before the mating of the feeder cap and breaker core in order to give the projection sufficient stability.
  • other materials can therefore also be used for the production of the breaker core, provided that they provide sufficient rigidity, so that the projection provided on the breaker core lets the feed opening be introduced. Examples of other suitable materials are sheet steel, cardboard, paper, wood or ceramic materials.
  • the break core can also be made of an uncured or partially cured molding material mixture.
  • the projection should be sufficiently dimensioned so that it is not destroyed when plugging the feeder cap and breaker core.
  • the projection is provided adjacent to the Speiso réelle on the feeder cap.
  • the feeder cap m can be uncured or partially wexse hardened or in fully hardened condition.
  • the feeder cap is used in this embodiment in fully cured form, so that the projection has sufficient strength to not be destroyed during mating of feeder cap and breaker core.
  • the breaker core is preferably used in uncured or partially hardened state, so that, in particular when the feeder cap m is used fully cured state, the breaker core can slightly yield when importing the arranged at the Lucasro réelle projection in the passage opening of the breaker core, so that an intimate contact between the outer surface of the projection and the surface adjacent to this in the passage opening of the refractive core is achieved. If the feeder cap is used in uncured or partially cured state, the breaker core can also be completely cured, since then the projection on the feeder cap still has sufficient flexibility, so that intimate contact between surfaces on the projection and in the fürlasso réelle can be produced.
  • the design of the projection is initially subject to no restrictions. Sufficient contact should be ensured between the outer surface of the projection and the surface of the opening in which the projection is received, so that the breaker core is held on the feeder cap.
  • the projection may be integrally formed. But it is also possible to design the projection in several parts. For example, a plurality of tab-shaped or pin-shaped projections may be provided be that cooperate so that a permanent fixation of the refractive core to the feeder cap is possible.
  • the projection is designed as a web which surrounds the opening or the passage opening.
  • the width of the web is chosen so that sufficient stability is ensured in order to insert the projection in the associated opening can.
  • the web has a width of 2 to 8 mm, in particular 3 to 5 mm.
  • the height of the web is preferably chosen so large that a sufficient contact surface between the outer surface of the projection and the associated surface of the corresponding opening is made available to ensure a stable connection between the refractive core and feeder cap.
  • the height of the web is selected between 0.5 and 4 cm, more preferably 1 to 3 cm.
  • the web is preferably arranged so that its inner wall is aligned with the opening of the part on which the web is arranged.
  • the projection can be produced by inserting a suitably shaped sleeve so that the passage opening of the breaker core or into the mouth of the feeder cap protrudes beyond the opening and forms a projection of the desired height.
  • the projection is emstuckig formed with the breaker core or the feeder cap. In this way, let the projection attach to the feeder cap or the break core in a single operation.
  • the outer surface of the web is preferably konusformig formed and the surface of the feeder cavity or füro réelle, where the outer surface of the web comes to rest, is preferably inclined according to the longitudinal axis of the feeder cap. In this way, the projection formed by the web can be safely and completely introduced into the associated opening without jamming or jamming occurring during the import. must be feared.
  • the inclination of the outer surface of the web or the wall of the opening relative to the longitudinal axis of the arrangement of refractive core and feeder cap is approximately equal, so that the two surfaces completely to each other come to rest.
  • the web is provided on the breaker core. Since the breaker core is preferably fully cured already prior to assembly with the feeder cap, the web has sufficient stability, so that it is not deformed during insertion into the Speiso réelle. As a result, the web can exert pressure on the wall of the Speisso réelle when imported into the opening and thus cause a slight deformation or compaction of the material of the feeder cap, so that intimate contact between the two surfaces is made.
  • the web is arranged on the breaker core, that the inner surface of the web is aligned with the passage opening of the breaker core. As inner surface, the surface is referred to, which is associated with the longitudinal axis of the breaker core while the outer surface is called the flat, which is arranged facing away from the longitudinal axis.
  • the refractive core and feeder cap are joined together using pressure, so that the wall of the feeder cavity can be at least partially deformed.
  • the breaker core with the associated projection or web is pressed into the feed opening, so that the material of the feeder cap is slightly compacted at the contact surface. The deformation is very slight and causes an intimate contact between the outer surface of the projection and the surface of the associated opening is achieved.
  • the breaker core in the füro réelle on at least one inclined surface to the longitudinal axis.
  • the let-through opening of the breaker core can for example have a single or a double bevel, so that a constriction with forms an edge which forms a constriction or a breaking edge on the residual feeder.
  • the invention therefore also relates to a feeder, at least comprising a feeder cap with a feeder cavity, which is open to at least one side to a Lucasro réelle, and a breaker core with a füro réelle, which is attached to the side of the Lucasro réelle to the feeder cap, wherein the breaker core or at least one projection is provided on the feeder head, the outer surface of which rests fully flat on a corresponding area of the passage opening or a portion of the wall of the feeder cavity adjoining the Lucasro réelle, so that the at least one projection is received frictionally in the Speisso réelle or the fürlasso Matt.
  • the feeder can be prepared by the method described above.
  • the breaker core is fixed to the feeder cap without the use of an adhesive and is held in position by the friction between the outer surface of the projection and the surface associated with the opening. Preferred embodiments of the feeder have already been discussed in the process.
  • the feeder cap and breaker core can be differently emgefarbt according to an embodiment, so that when removing the feeder from a storage device is immediately apparent in which orientation the feeder to be placed on a casting model.
  • the at least one projection is preferably designed as a web surrounding the passage opening or the feed opening.
  • the web has a conical outer surface and the portion of the wall of the feeder cavity or the passage opening, on which rests the outer surface of the web, preferably has a corresponding inclination to the longitudinal axis of the feeder cap or the refractive core.
  • the breaker core has in its passage opening at least one inclined surface to the longitudinal axis.
  • the at least one inclined surface circumscribes the passage opening, so that the cross section of the passage opening narrows in the direction of the longitudinal axis, ie, a constriction of the passage opening is formed, which generates a corresponding constriction or breaking edge at the bottom of the residual feeder at the residual feeder.
  • Fig. 1 a schematic representation of steps, as they are going through in the manufacture of a feeder according to a method according to the prior art
  • Fig. 2 a schematic representation of steps, as they are undergoing the process of the invention.
  • FIG. 1 shows working steps that are carried out during the production of a feeder according to a method, as it was previously known from the prior art.
  • the components used to assemble the feeder are each shown as a longitudinal section.
  • 1 a shows a feeder cap 1 made of a refractory molding material, for example hollow microspheres made of an aluminum silicate, which has been solidified with a suitable binder, for example water glass.
  • Feeder cap 1 was produced by conventional methods from a molding material mixture and is completely cured.
  • a Jardinrhohl- space 2 is arranged, which is open via a Amsterdamro réelle 3 to the environment.
  • the illustrated feeder cap 1 is open only to one side.
  • Opposite the Speiso réelle 3 is a receptacle 4 for a spring mandrel (not shown).
  • Around the Amsterdamro réelle encircling a flat surface 5 is provided.
  • a breaker core 6 which has a füro réelle 7.
  • Breaker core 6 is also made of a refractory molding material and is completely cured.
  • the füro réelle 7 has a circular cross-section.
  • 9 are arranged, which are each inclined to the longitudinal axis 10, so that the cross section of the füro réelle viewed 7 m in the direction of the longitudinal axis 10 initially curved and then expanded again, so that an edge 11 is formed.
  • the circumferential surface 5 on the feeder head and a corresponding circumferential surface 12 on the breaker core 6 are coated with adhesive. It may also be sufficient to apply adhesive to only one of the circumferential surfaces 5, 12.
  • an organic or an inorganic adhesive such as water glass may be used.
  • Feeder cap 1 and breaker core 6 are then merged so that the circumferential surfaces 5 and 12 come into contact with each other and the long axes 10 of feeder cap 1 and breaker core 6 are aligned.
  • Breaking core 6 is fixed to the Feeder cap 1 is connected, wherein the feeder cavity 2 is opened via the fürlasso réelle 7 of the refractive core to the environment.
  • the adhesive at the connection point between feeder cap 1 and breaker core 6 can be cured by suitable processes, for example by vaporizing the solvent contained in the adhesive or by triggering a curing reaction.
  • Fig. 2 shows steps that are performed in the manufacture of a feeder in the inventive method.
  • the components of the feeder are, as in the feeder shown in FIG. 1, rotationally symmetrical about a longitudinal axis and shown in longitudinal section.
  • FIG. 2a again shows a feeder cap 1, which corresponds in its geometry to the feeder cap 1 shown in FIG.
  • the feeder cap 1 comprises a feeder cavity 2, which is open via a Lucasro réelle 3 to the environment. To the Lucasro réelle 3 a circumferential flat surface 5 is provided.
  • the feeder cap 1 is in turn made of a refractory molding material, for example, Alummiumsilikat- microballoons.
  • the refractory molding material is mixed with a binder, such as water glass.
  • a molding material mixture comprising the refractory molding material and the binder is brought into the desired shape by conventional methods, for example by the mold material mixture being shot by means of compressed air in a suitably configured mold.
  • the feeder cap 1 In contrast to the method shown m Figure 1, the feeder cap 1 but only so far outgassed that on the one hand it is so stable that it can be removed from the mold and transported to a next production station, but on the other hand is still plastically deformable when using higher pressures.
  • the blank still in the form of hot air or carbon dioxide are flowed through, so that the water glass is partially solidified and the feeder cap 1 maintains sufficient stability and yet remains plastically deformable.
  • a breaker core 6 is shown in Fig. 2a, which has a fürlasso réelle 7, in which two inclined surfaces 8, 9 are arranged, which form an edge 11.
  • a web 13 is disposed on the surface 12, which protrudes from the surface 12.
  • the web 13 is slightly inclined to the longitudinal axis 10, so that its outer surface 14 corresponds to the outer surface of a cone.
  • the breaker core 6 is also made of a refractory molding material, for example also of aluminum silicate hollow microspheres, which is solidified with a binder, for example, also water glass. Breaker core 6 is completely cured, so that the web 13 has sufficient stability, so as not to break when using light pressure.
  • Breaker core 6 and feeder cap 1 are then assembled without the use of adhesive.
  • the cone-shaped web 13 is inserted into the Suitero réelle 3, to on the one hand, the outer surface 14 of the web 13 on the surface 15 of the feeder cavity 2 and on the other hand flat 12 of the refractive core 6 at the circumferential around the Whyroff- 3 flat 5 of the feeder cap 1 to rest arrives.
  • the wall 15 of the feeder cavity may slightly yield on contact with the outer surface 14 of the web 13, so that a very close contact between the surfaces is achieved.
  • Fig. 2b One obtains an arrangement as shown in Fig. 2b.
  • Feeder cap 1 and breaker core 6 form a unit, wherein the longitudinal Axes 10 of feeder cap 1 and breaker core 6 are aligned.
  • the unit formed from feeder cap 1 and breaker core 6 is then completely cured by, for example, drying the unit in an oven so that the binder cures completely. This can be done, for example, by evaporating the water still contained in the water glass, which is still contained in the feeder cap 1. In this case, the feeder cap 1 still slightly shrink, so that the web 13 closely abuts against the wall 5 of the feeder cavity 2 and is firmly enclosed by this, so that the breaker core 6 is held firmly on the feeder cap 1.

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  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

L’invention concerne un procédé de fabrication d’une masselotte et une masselotte qui peut être obtenue par le procédé. Le procédé de fabrication prévoit l’utilisation d’un noyau de cassage 6, sur l’ouverture de passage 7 duquel est disposée une traverse 13. Le corps de masselotte 1 est seulement durci à un certain niveau, afin de pouvoir encore subir une déformation plastique. Le noyau de cassage 6 et le corps de masselotte 1 sont assemblés de telle manière que la traverse 13 est introduite dans l’ouverture 3 de masselotte d’une cavité 2 de la masselotte, jusqu’à ce que la surface extérieure 14 de la traverse 13 vienne au contact de la paroi 15 de la cavité. Ensuite, la masselotte est complètement durcie. Il n’est donc pas nécessaire d’utiliser un adhésif entre les surfaces de contact du noyau de cassage 6 et du corps de masselotte 1 pour obtenir une liaison solide de celles-ci.
PCT/EP2009/001204 2008-02-19 2009-02-19 Masselotte dotée à l’intérieur d’un noyau de cassage WO2009103539A1 (fr)

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DE102008009730.6 2008-02-19
DE200810009730 DE102008009730A1 (de) 2008-02-19 2008-02-19 Speiser mit eingestecktem Brechkern

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WO2009103539A1 true WO2009103539A1 (fr) 2009-08-27

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CN102641994A (zh) * 2011-02-17 2012-08-22 福塞科国际有限公司 供料器元件
DE202015104554U1 (de) 2015-08-27 2015-09-15 GTP Schäfer Gießtechnische Produkte GmbH Speiser mit einem dessen Speiseröffnung überspannenden netzartigen Gewebe
DE202015104553U1 (de) 2015-08-27 2015-09-15 GTP Schäfer Gießtechnische Produkte GmbH Brechkern mit einem dessen Durchtrittsöffnung durchsetzenden netzartigen Gewebe
CN105522115A (zh) * 2014-09-30 2016-04-27 济南圣泉倍进陶瓷过滤器有限公司 补缩装置和系统及高压造型方法
WO2017072004A1 (fr) 2015-10-27 2017-05-04 Gtp Schäfer Giesstechnische Produkte Gmbh Mandrin de formage doté d'une enveloppe pouvant être élargie et modèle de coulée doté d'un mandrin de formage ainsi que procédé de coulée de métaux
CN111014586A (zh) * 2020-01-07 2020-04-17 晋西装备制造有限责任公司 一种防止铸件冒口根部裂纹的铸造方法

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CN103551511B (zh) * 2013-11-14 2015-07-29 沈阳工业大学 储液式冒口易割片
GB201415516D0 (en) 2014-09-02 2014-10-15 Foseco Int Feeder system
EP3334547B1 (fr) 2015-09-02 2024-06-05 Foseco International Limited Système de masselotte
SI3337631T1 (sl) * 2015-09-02 2020-07-31 Foseco International Limited Sistem za dovajanje
EP3395470B1 (fr) * 2017-04-28 2021-06-02 Foseco International Limited Système d'alimentation

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DE4200183A1 (de) * 1991-01-14 1992-07-16 Erich Kuehn Zweigeteilter speiser
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DE10039519A1 (de) * 2000-08-08 2002-02-21 Chemex Gmbh Speisereinsatz

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102641994A (zh) * 2011-02-17 2012-08-22 福塞科国际有限公司 供料器元件
CN102641994B (zh) * 2011-02-17 2015-08-12 福塞科国际有限公司 供料器元件及供料器系统
CN105522115A (zh) * 2014-09-30 2016-04-27 济南圣泉倍进陶瓷过滤器有限公司 补缩装置和系统及高压造型方法
DE202015104554U1 (de) 2015-08-27 2015-09-15 GTP Schäfer Gießtechnische Produkte GmbH Speiser mit einem dessen Speiseröffnung überspannenden netzartigen Gewebe
DE202015104553U1 (de) 2015-08-27 2015-09-15 GTP Schäfer Gießtechnische Produkte GmbH Brechkern mit einem dessen Durchtrittsöffnung durchsetzenden netzartigen Gewebe
EP3135400A1 (fr) 2015-08-27 2017-03-01 GTP Schäfer Gießtechnische Produkte GmbH Noyau d'etranglement comprenant un tissu reticulaire s'introduisant dans son ouverture de passage
EP3138642A1 (fr) 2015-08-27 2017-03-08 GTP-Schäfer Giesstechnische Produkte GmbH Dispositif d'alimentation comprenant un tissu reticulaire recouvrant son ouverture d'alimentation
WO2017072004A1 (fr) 2015-10-27 2017-05-04 Gtp Schäfer Giesstechnische Produkte Gmbh Mandrin de formage doté d'une enveloppe pouvant être élargie et modèle de coulée doté d'un mandrin de formage ainsi que procédé de coulée de métaux
CN111014586A (zh) * 2020-01-07 2020-04-17 晋西装备制造有限责任公司 一种防止铸件冒口根部裂纹的铸造方法

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