EP3551358A1 - Procédé et outil de moulage ou outil à noyau destinés à fabriquer des moules ou des noyaux - Google Patents

Procédé et outil de moulage ou outil à noyau destinés à fabriquer des moules ou des noyaux

Info

Publication number
EP3551358A1
EP3551358A1 EP17816409.1A EP17816409A EP3551358A1 EP 3551358 A1 EP3551358 A1 EP 3551358A1 EP 17816409 A EP17816409 A EP 17816409A EP 3551358 A1 EP3551358 A1 EP 3551358A1
Authority
EP
European Patent Office
Prior art keywords
core
mixture
sand
tool
housing
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.)
Granted
Application number
EP17816409.1A
Other languages
German (de)
English (en)
Other versions
EP3551358B1 (fr
Inventor
Wolfram Bach
Michael Kaftan
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.)
Soplain GmbH
Original Assignee
Soplain 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 Soplain GmbH filed Critical Soplain GmbH
Publication of EP3551358A1 publication Critical patent/EP3551358A1/fr
Application granted granted Critical
Publication of EP3551358B1 publication Critical patent/EP3551358B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—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
    • B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
    • B22C1/10—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives for influencing the hardening tendency of the mould material
    • 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
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/06—Core boxes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/06—Core boxes
    • B22C7/065—Venting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/06—Core boxes
    • B22C7/067—Ejector elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening

Definitions

  • the present invention relates to a method for producing molds or cores for foundry purposes using current by means of adjusting the specific electrical resistance of the core box material to a
  • the invention also relates to a forming or core tool for making molds or cores.
  • Molded material that is, for example, foundry sand and the water-containing
  • Binder introduced into the mold or core tool and there through
  • Heating cured By using an inorganic binder leakage of environmentally damaging gases when curing the mixture should be avoided. This registration is partly based on the
  • Formsand adjacent fine-pored layer range of 0.2-2 mm thickness, 75- 95% of the theoretical material density and pore diameter ⁇ 50 microns, to which a second, massive area in the form of a large-pored supporting skeleton of ⁇ 80% of the theoretical material density and a middle
  • From DE 24 35 886 A1 discloses a method for the production of foundry molds or cores by introducing a mixture of aggregate and binder in a mold or core box and heating the mixture is known, wherein the heating causes by passing a electrical current through the mixture becomes.
  • frame-shaped or box-shaped preferably slightly tapered downwards design, with a circumferential wall and a box-like configuration also has a bottom.
  • Mold or core tools for inorganic processes are mainly made of metal such as steel or aluminum.
  • the disadvantage of the above-mentioned application is that an insulating layer between the parts of the forming or core tools is needed, which should prevent the short circuit when applying the voltage and thus the
  • Insulation layer Insulation layer.
  • the electric current always seeks the path of least resistance to equalize the electrical potentials.
  • Metallic coring tools have a resistance ranging from, for example, 2x10 "7 ohmmeter (steel) wherein the sand-binder mixtures in the range from about 10 1 to 10 2 ohm meter lie. Since the resistance of the core box is much lower than in the sand binder mixture, the current flows to the contact surface within the core box and is then passed through the sand binder mixture for a short distance, resulting in thicker parts of the core
  • Another disadvantage is based on the same approach that current always seeks the path of least resistance.
  • the method would therefore only work for geometries with the same sand core thicknesses. For example, this is the case with cylinders and cuboids. Thus, the method is only applicable to simple geometric shapes.
  • Another disadvantage is observed when curing by means of heat transfer. Since sand-binder mixtures are generally rather poor heat conductors, heat transfer from heated core boxes results in shell formation at the outer edges of the sand core because the shell hardens rather than the sand core interior. For economic reasons, it is not always the full cure before unloading waiting, so that the sand cores can break more easily.
  • Shell formation Because of the shell formation, the interior of the sand core has not yet completely hardened, this results in a limitation of the maximum sand core thickness, which can be produced with existing methods.
  • the maximum thickness of the sand core depends on the duration of the heating and the weight of the sand core. If the heating is not sufficient, the outer shell of the sand core, despite complete curing, can not fully support the weight and can thus lead to breakage of the sand core.
  • the present invention therefore deals with the problem of providing an improved or at least one alternative embodiment for a method of the generic type which overcomes in particular the disadvantages known from the prior art.
  • the present invention is based on the general idea when selecting the material of the separable mold or core tools the specific electrical conductivity should be taken into account so that it corresponds to the electrical conductivity of a (sand-binder) mixture approximately during the optimum working temperature.
  • the electrical conductivity of the forming or core tool (cavity) is thus determined by the sand binder mixture used.
  • an electrically conductive material is permanently introduced into a housing of the forming or core tool and there takes the mixture described above from a
  • Molded material for example. Of sand (foundry sand), and containing water
  • Binder which forms an electrolyte in dissolved form and has sufficient electrical conductivity on.
  • the present invention is further based on the general idea of a mold or core tool for making molds or cores, for example.
  • the inventive mold or core tool has an existing at least two parts, electrically non-conductive housing.
  • the shape or Core tool also has at least two electrodes, wherein in each case one electrode is arranged in a part of the housing. Electrical energy is later introduced into the material via the two parallel electrodes and into the mixture via the latter, whereby the mixture is heated and thereby cured.
  • the process requires direct contact of the conductive material and the core box electrodes. Thus, it is possible to dispense with an insulating layer between the core box parts.
  • the introduction of the mixture takes place for each cycle of sand core production wherein the electrically conductive material is introduced once per production of the mold or core tool.
  • the material thus forms the negative contour of the sand core or the mold to be produced later therein.
  • heat is subsequently applied to the material via the electrodes, electrical energy and above which are arranged in / on the housing of the molding or core tool, which leads to a hardening of the mixture.
  • the housing is merely a container for receiving the conductive material and must be electrically non-conductive, otherwise the current is passed exclusively through the housing and not by the material or the mixture.
  • the housing can be made of plastic and has the advantage that it is comparatively light and therefore easy to handle. Alternatively, an insulating ceramic or other electrically non-conductive material may be used.
  • Parts of the housing can be connected to one another via one or more parting planes, the electrodes preferably being parallel arranged to each other or even embedded in a part of the housing.
  • the voltage applied to the electrodes can be regulated, for example, increased, so that short cycle times for the curing process can be achieved. Short cycle times in turn allow a comparatively cost-effective production of the molds or cores.
  • the regulation of the power / voltage can be done by means of inverter / power controller or by applying different voltages. Alternatively, the method can also be operated by means of a constant applied voltage.
  • the electrical energy in the form of AC or DC can be supplied to the material and sand binder mixture (mixture).
  • AC is available everywhere and can be regulated almost arbitrarily.
  • steam can be removed via core marks (nozzles) from the sand core (core) and the material, the electrodes and the housing via bores.
  • the material may also be porous and thus allow the escape of gases or water vapor.
  • the ejector pins should be made of non-conductive material to avoid a short circuit. Required ejector pins are fastened in the designated ejection holes with the base plate of the tool.
  • conductive ejector pins may also be used, as long as it is structurally ensured that they are not in contact with a current-conducting material while the current is switched on.
  • Form surface prevents what would be the case, for example, when curing by means of external heat (eg oil heating).
  • external heat e.g oil heating
  • Another advantage results from the fact that no external heating devices are needed. Not only does this increase the efficiency of the process as described above, it also reduces the acquisition and maintenance costs of any external heating devices. In addition, this makes it possible to provide systems with a smaller space requirement so that more equipment can tend to be accommodated on the same area.
  • Core tool materials such as steel or aluminum is a very hard material (Mohs thickness 9.5) and thus extends the life of the core box due to less wear.
  • an inventive method for the production of molds or cores for foundry purposes by means of adaptation of the specific works electrical resistance of the material of the tool insert to the specific electrical resistance of a mixture of at least one molding material, in particular foundry sand, and at least one water-containing inorganic, heat-curable binder, which has a sufficient electrical conductivity of at least 5 ⁇ 10 "3 S / m.
  • Inserted insert made of an electrically conductive material for receiving the mixture, wherein the electrical conductivity of the material at operating temperature between 150 and 180 ° C at least approximately corresponds to the specific electrical conductivity of the mixture at a temperature between about 100 ° C to 130 ° C,
  • electrical energy is supplied to the tool insert via electrical electrodes arranged in and / or parallel to the housing and, if required, over the whole area, which heat causes the mixture to cure,
  • the housing consists of at least two housing parts, which for
  • both the tool and the electrodes and at least a portion of the housing are porous
  • Fig. 1 is a sectional view through an inventive mold or
  • FIG. 2 shows a phase diagram with a qualitative representation of an introduced electrical power and an associated resistance in a core or a mold
  • Fig. 3 is a representation of the heating by means of existing electrical
  • Fig. 4 shows a possible core box design
  • Fig. 5 shows a fastening of the material with insulating housing
  • Fig. 6 is an illustration of venting and ejection holes with a
  • FIG. 6 a. View from above (Fig. 6 a.)), A front view (Fig. 6 b.)) And a side view (Fig. 6 c.)).
  • an inventive mold or core tool 1 for the production of molds 2 or cores 2 'for foundry purposes a machine electrically insulated housing 3, which consists of two parts 4, 5, via a parting plane 6 with each other are connected.
  • the housing 3 is mounted on a base plate 12.
  • the housing 3 is formed of plastic, insulating ceramic or other non-conductive material and receives an electrically conductive material 7.
  • the material 7 forms a mold for receiving a mixture 9, from which, after hardening, the core 2 'or the mold 2 is formed.
  • the material 7 may be, for example, a ceramic material.
  • the specific electrical conductivity of the mixture 9 and the specific electrical conductivity of the material 7 are at least approximately the same size, eg not more than in phase 2 of FIG. 2, so that the material 7 and the mixture 9 are substantially the same specific electrical conductivity and the same specific electrical resistance prevail.
  • the inventive molding or core tool 1 moreover has at least two electrodes 10 which are arranged parallel to one another.
  • the specific electrical conductivity of the material 7 of the core 2 'or of the mold 2 now corresponds approximately to the specific one electrical conductivity of the mixture 9 in phase 2 of Fig. 2, whereby a comparatively uniform passage of electrical energy through the mixture 9 is possible.
  • the mold or core tool 1 according to the invention can be used to produce a mold 2 or a core 2 'or a casting core 2' at the highest qualitative level, since, owing to the at least nearly identical electrical conductivity, that for the mold 2 or the core 2 'used mixture 9 and the material 7 a uniform passage of electrical current through the material 7 and the mixture 9 and thus a uniform heating and curing of the mixture 9 can be carried out regardless of the respective
  • the mold 2 or the core 2 ' is produced as follows: First, after the material selection mentioned during the first construction, the electrically conductive material 7 is introduced into the housing 3 of the forming or core tool 1 and forms a negative mold for the subsequent mold 2 or Subsequently, the material 7 via the electrodes 10 electrical energy and thus heat is supplied to the material 7, which lead to a curing of the mixture 9. A hardening of the mixture 9 is effected in particular by evaporation of water from the mixture 9, wherein the mixture 9 may for example contain an inorganic binder, water and foundry sand.
  • Binder may be water-soluble, but at least contain water and is in any case electrically conductive.
  • the voltage can be increased or decreased by the device 8, as a result of which a cycle time for producing the mold 2 or the core 2 'can be controlled.
  • the base plate of the tool 12 receives the housing 3 or the parts 4, 5 as well as the material 7 and insulating screws 13 and angle 14 provide for a fastening. Insulating screws 13 can also be replaced by quick release systems in order to facilitate easier and faster removal.
  • the material "floats" on the electrode 10 and the electrode 10 is held in place by alignment bolts 15.
  • Table 1 shows several series of measurements with different sand-binder mixtures 9. The finding is that the specific electrical conductivity thereby depends on the desired sand-binder mixture 9 and can be influenced by variation of additives and / or by changing the percentages. ever stronger the electrically conductive portion in the sand-binder mixture 9, the lower the specific electrical resistance in the sand-binder mixture. 9
  • each binder has an optimal Working temperature which ensures the best possible curing. For the binders tested this was around 150-180 ° C and depends on the manufacturer's instructions and possibly on binder additives used.
  • Table 1 shows exemplary selected resistance temperature values for sand-binder mixtures based on inorganic binders and binder variations.
  • Various water glass components and graphite additives were also investigated. The curves were determined as follows:
  • a comparison sample has to be created.
  • the specimen consists of two opposite metallic electrodes and an insulating tube between the electrodes. Geometry (area and distance of the electrodes) of the body inside the insulating tube must be determined.
  • the cavity is filled with a green, uncured sand-binder mixture 9.
  • the sand binder mixture 9 must correspond to the mixture 9 to be used later during production.
  • the mixture 9 must be real
  • Measuring devices connected to determine the voltage, the current and the temperature. A constant voltage is applied to the electrodes via a power supply. The calculated resistance results from the applied voltage divided by the measured current.
  • Rho R * A / I
  • Rho specific electrical resistance of the mixture
  • phase 1 capacitive load
  • the electrical resistivity of the tested mixtures 9 changes during the heating process. It is below 100 ° C at about 85 Ohmmeter and falls with further warming below 25 ohm meters at about 130 ° C. With further warming, the resistivity increases dramatically. But then the energy required to expel the water from the binder, which leads to curing, in the sand binder mixture 9 is also present.
  • the inorganic binder can be replaced by other binder types, provided that they are electrically conductive and require heat for curing and have the other required properties.
  • the determination of the material 7 based on the required resistivity is possible after the determination of the temperature-resistance curve of the sand binder mixture 9.
  • Temperature has. This particular temperature depends on the optimum temperature which the binder needs to cure the best.
  • tested binders required temperatures of about 150 ° C to about 180 ° C to cure.
  • the area around the optimal resistance was determined by means of a temperature-resistance curve (see above) by approx. 25 ohmmeters.
  • the tested binder mixture 9 requires a material 7 having a resistivity of about 25 ohm-meters at 150-180 ° C.
  • the specific resistance of the material 7 should be equal to the optimum resistivity for the sand-binder mixture 9. Should be in the implementation of the specific resistance of the material 7 above that of the sand-binder mixture 9, this tends to lead to heating from the center of the core 2 in the direction of the core box material 7, since here the current finds the way of lower resistance.
  • the specific resistance of the material 7 should be less than in the sand-binder mixture 9, the heating of the core-box material 7 in the direction of the sand core center tends to take place.
  • the course of the temperature-resistance curve of the material 7 should be similar to the temperature-resistance curve of the sand binder mixture 9. The lower the deviation of both curves, the more effective is the method.
  • test series for the determination of the material can be as follows
  • a starting material such as. Example silicon carbide
  • This material sample is then clamped in a device between two electrodes, so that these electrodes have a direct contact with the sample plate. Subsequently, the temperature-resistance curve for this sample material is determined. Should the deviation between the resistivity of the sample material and the optimum resistivity of the sand binder mixture 9 be too great, the material composition must be revised.
  • silicon carbide compositions having a variation in graphite content in the ceramic mixture have been found to be positive. But in principle, other material compositions or material additives, which is the electrical affecting specific resistance, possible. The graphite part is bound in the ceramic and thus has no influence on further casting processes.
  • the selected material 7 must also fulfill the other physical properties for the environment of foundries. For example, breakage resistance, surface roughness, thermal expansion and thermal conductivity are mentioned here.
  • the ceramic selected for further testing has a specific one
  • the maximum short-term load of the material 7 must be determined, at which no permanent damage of the material 7 occurs yet.
  • This maximum short-term load plays an important role for the electric control in the following. This is determined with stress tests and may be too
  • Adjustment of the electrical resistivity of the selected mixture 9 corresponds and also the other requirements are met to the foundry.
  • the repeated concept of "adaptation" describes the previously mentioned
  • the ceramic is produced in several production steps according to common ceramic production methods. Especially fine finishing after sintering requires the utmost attention due to the very hard material (Mohs hardness of approx. 9.5). The more accurate the finishing, the lower the later
  • the attachment can be made in the core box.
  • the material 7 requires a direct on the opposite side of the contouring surface
  • the electrode 10 should be laid floating on the back of the material part. This is necessary because the material of the electrodes 10 usually has a higher thermal expansion than the core box material. For this purpose, two pins can be attached in the back of the material, which hold the electrodes 10 in position during the production process. Due to the parallel arrangement of the electrodes 10, a comparatively uniform passage of electrical energy through the material 7 and the mixture 9 can be achieved, which in turn results in advantages with respect to a uniform heating and a uniform curing.
  • One possible embodiment also provides for introduction of the electrodes 10 into the material 7. In this case, no pins would be needed for alignment. The electrodes 10 and the material 7 will then be received by means of a recess in an insulating material.
  • the attachment of the multilayer levels can be done by means of anchoring in the base plate 12 of the tool.
  • For the attachment angles 14 can be used with screw 15, as shown in Figure 5 by way of example.
  • quick-release systems can be used instead of screws.
  • vents 17 are provided in the material 7, in the electrodes 10 and in the housing 3 in order to allow the escape of the gases or of the water vapor.
  • gases or water vapor can, as in existing processes by means of core marks (nozzles) from the sand core 2 "(core) and the material 7, the electrodes 10 and the housing 3 via
  • Holes 17 are discharged.
  • the material may also be porous and thus allow the escape of gases or water vapor.
  • the electrodes 10 require a power supply, which is connected to the external cabinet and thus allows an electric control 8.
  • the electric control 8 must be adapted to the core box as well as the method.
  • the electric controller 8 takes on the task of providing the core box by means of power supply and electrodes 10 sufficient power.
  • the electric control 8 (device 8) must be planned accordingly.
  • switchgear systems can be rebuilt and adapted. It is important that the supply of energy into the material 7 via electrodes 10 takes place. In this case, AC or DC is conceivable.
  • the control of the power supply must take into account the maximum short-term load of the selected material 7 and the resistance-temperature curve of the material 7 and the sand-binder mixture 9.
  • the electric control 8 is to be chosen so that the highest possible
  • Heat development in the sand-binder mixture 9 is dependent on the specific resistance and the applied voltage. Therefore, with regulation of the voltage, the power input and the temperature can be controlled.
  • the core box should have temperature sensors to avoid heating above the prescribed working range of the binder, as too high a temperature would otherwise adversely affect the bonding force.
  • the electric controller 8 also controls the different process steps of the core shooting machine. Care must be taken especially when moving together the core box parts, the merger in one Adapted speed happens to avoid a shock effect in the core box material and thus a possible permanent damage.
  • For core tools with multiple sand cores 2 can either a
  • Pair of electrodes per sand core 2 "or a pair of electrodes which covers all sand cores 2 of the complete core box, taking into account that during the heating process the control is to be chosen so that all sand cores 2 can cure in the desired cycle time but never the temperature in the core Sand core 2 "rises above the point where the binders lose their binding power.
  • the regular production process is divided into three processes.
  • the first process describes the commissioning of the system after a short or long standstill.
  • a feature during this process is that the material 7 has not yet reached the planned operating temperature.
  • the heating of the core box takes place as well as in the typical production process.
  • the parts 4, 5 are brought together from their original position and form a
  • the sand-binder mixture 9 can be shot in the core box.
  • the energy is supplied by means of electricity thanks to the electric control 8. Due to increased specific resistances of the material 7, the warm-up process takes a little longer than the regular production cycle times. During the warm-up process, the core box heats up slowly and with the rise of the temperature drops specific resistance of the material 7. The more the resistance falls, the faster the material 7 continues to heat up according to the principle of
  • the process parameters can be described as follows.
  • the material 7 of the core box has the operating temperature and thus the optimum specific resistance of the sand binder mixture 9.
  • the core box parts 4, 5 are moved apart and the Sandkernkavtician is empty.
  • the core box parts 4, 5 are closed and then the sand-binder mixture 9 is shot into the core box.
  • the specific resistance is dependent on the temperature of the sand-binder mixture 9.
  • the mixture 9 may be at room temperature or already preheated.
  • the electric control 8 activates the current flow and this leads to a
  • the particular advantage of the method is therefore particularly in the heating of the sand-binder mixture 9 from the temperature at injection up to about 130 ° C by the principle of resistance heating by means of current flow within the sand core 2.
  • the further advantage is the efficient heating of the material. 7 and thus the heat supply in the phase of 130 ° C to the desired operating temperature of the sand-binder mixture. 9
  • a sand-binder mixture 9 with an operating temperature of about 170 ° C and a Einschusstemperatur of about 20 ° C is used.
  • about 150 ° C are needed for heating.
  • 2/3 (about 100 ° C) of the required heat energy very quickly means
  • Resistance heating within the sand core 2 are generated and about 1/3 by means of heat transfer of the material 7 to the sand core 2 ".
  • the sand core 2 After reaching the operating temperature or curing, the sand core 2 "can be removed as in existing core shooting methods.
  • Required ejector pins 16 for ejecting the sand core from the cavity are fastened in the ejection bores 16 'provided for this purpose and enable the sand cores 2 to be released from the material 7.
  • the third process describes the cooling phase before a break or
  • Mold surface prevents what would be the case, for example, when curing by means of external heat (for example, oil heating).
  • external heat for example, oil heating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Mold Materials And Core Materials (AREA)

Abstract

La présente invention concerne un procédé de fabrication plus rapide de moules (2) ou de noyaux (2') destinés à des fins de fonderie, au moyen d'un ajustement de la résistance électrique spécifique, lors de la sélection du matériau de boîte à noyau, au mélange (9) d'un matériau de moulage et d'un liant contenant de l'eau, lequel, sous forme dissoute, forme un électrolyte et lequel comporte une conductivité électrique suffisante. Selon l'invention, dans un boîtier (3) non conducteur électriquement, un matériau électriquement conducteur (7) est introduit pour recevoir le mélange (9), la conductivité électrique spécifique du matériau (7) à une température de fonctionnement (7) correspondant au moins approximativement à la conductivité caractéristique spécifique du mélange (9) à des températures comprises entre 100°C et 130°C de telle sorte que le matériau (7) est alimenté, au moyen d'électrodes (10) disposées sur/dans le boîtier (3), en énergie électrique et ainsi en chaleur (le principe de chauffage par résistance), laquelle conduit à un durcissement du mélange (9). En fonction d'un noyau de sable, des temps de cycle jusqu'à 30% plus rapide peuvent être effectués.
EP17816409.1A 2016-12-06 2017-11-20 Procédé et outil de moulage ou outil à noyau destinés à fabriquer des moules ou des noyaux Active EP3551358B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102016224183 2016-12-06
DE102017217096.4A DE102017217096B3 (de) 2016-12-06 2017-09-26 Werkzeugeinsatz, Form- oder Kernwerkzeug sowie Verfahren zur Herstellung von Formen oder Kernen
PCT/DE2017/100995 WO2018103784A1 (fr) 2016-12-06 2017-11-20 Procédé et outil de moulage ou outil à noyau destinés à fabriquer des moules ou des noyaux

Publications (2)

Publication Number Publication Date
EP3551358A1 true EP3551358A1 (fr) 2019-10-16
EP3551358B1 EP3551358B1 (fr) 2021-01-13

Family

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Application Number Title Priority Date Filing Date
EP17816409.1A Active EP3551358B1 (fr) 2016-12-06 2017-11-20 Procédé et outil de moulage ou outil à noyau destinés à fabriquer des moules ou des noyaux
EP17825733.3A Withdrawn EP3551359A1 (fr) 2016-12-06 2017-12-02 Insert d'outil, outil de moulage ou outil à noyau ainsi que procédé de fabrication de moules ou de noyaux

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EP17825733.3A Withdrawn EP3551359A1 (fr) 2016-12-06 2017-12-02 Insert d'outil, outil de moulage ou outil à noyau ainsi que procédé de fabrication de moules ou de noyaux

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US (2) US10967420B2 (fr)
EP (2) EP3551358B1 (fr)
JP (1) JP2019536638A (fr)
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DE102018128605B4 (de) * 2018-11-14 2020-07-30 Meissner Ag Modell- Und Werkzeugfabrik Gusswerkzeug, beispielsweise Kernschießwerkzeug oder Kokille, und ein entsprechendes Gießverfahren
DE102019113008A1 (de) 2019-05-16 2020-11-19 HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung Verwendung eines partikulären Materials umfassend ein teilchenförmiges synthetisches amorphes Siliciumdioxid als Additiv für eine Formstoffmischung, entsprechende Verfahren, Mischungen und Kits
DE102019116406A1 (de) * 2019-06-17 2020-12-17 HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung Additivmischung für Formstoffmischungen zur Herstellung wasserglasgebundener Gießereiformen und Gießereikerne
DE102019131676A1 (de) 2019-11-22 2021-05-27 HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung Kerne für den Druckguss
DE102020119013A1 (de) 2020-07-17 2022-01-20 HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung Verfahren zur Herstellung eines Artikels zur Verwendung in der Gießereiindustrie, entsprechende Form, Kern, Speiserelement oder Formstoffmischung sowie Vorrichtungen und Verwendungen
DE102020209100B4 (de) 2020-07-21 2024-05-23 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eingetragener Verein Verfahren zur Herstellung von Sandkernen, die für Gießereizwecke einsetzbar sind
DE102020131492A1 (de) 2020-11-27 2022-06-02 Chemex Foundry Solutions Gmbh Herstellverfahren, Gießformen, Kerne oder Speiser sowie Kit und Verfahren zur Herstellung eines metallischen Gussteils.

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Publication number Publication date
US10967420B2 (en) 2021-04-06
US20200391279A1 (en) 2020-12-17
CN110248747B (zh) 2021-07-16
EP3551359A1 (fr) 2019-10-16
WO2018103792A1 (fr) 2018-06-14
CN110248747A (zh) 2019-09-17
EP3551358B1 (fr) 2021-01-13
DE102017217096B3 (de) 2018-03-22
JP2019536638A (ja) 2019-12-19
DE102017217098B3 (de) 2018-04-05
WO2018103784A1 (fr) 2018-06-14
US20200188988A1 (en) 2020-06-18

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