EP3551359A1 - Insert d'outil, outil de moulage ou outil à noyau ainsi que procédé de fabrication de moules ou de noyaux - Google Patents

Insert d'outil, outil de moulage ou outil à noyau ainsi que procédé de fabrication de moules ou de noyaux

Info

Publication number
EP3551359A1
EP3551359A1 EP17825733.3A EP17825733A EP3551359A1 EP 3551359 A1 EP3551359 A1 EP 3551359A1 EP 17825733 A EP17825733 A EP 17825733A EP 3551359 A1 EP3551359 A1 EP 3551359A1
Authority
EP
European Patent Office
Prior art keywords
core
mixture
tool
sand
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.)
Withdrawn
Application number
EP17825733.3A
Other languages
German (de)
English (en)
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 EP3551359A1 publication Critical patent/EP3551359A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—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

  • 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.
  • 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.
  • Mold or core tools for inorganic processes are primarily made of metal such as e.g. Made of steel or aluminum.
  • Insulation layer Insulation layer.
  • the electric current always seeks the path of least resistance to equalize the electrical potentials.
  • Metallic core tools have a resistance range of, for example, 2x10-7 ohm-meters (steel), with sand-binder mixtures ranging from about 10 1 to 10 2 ohm meters. Since the resistance at the core box is much lower than in the sand binder mixture, the stream flows up to the contact surface within the core box and is then passed through the sand binder mixture for a short distance. This has the consequence that on thicker parts of the
  • the core box material (7) should be made of metal and the Sandbindergemisch (2) fills the cavity of the core box. Between the contact surfaces of the core box is an insulation layer (16).
  • 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 in selecting the material of the separable forming or core tools
  • Conductivity should be taken into account so that it corresponds to the electrical conductivity of the sand-binder mixture approximately during the optimal working temperature.
  • the electrical conductivity of the molding tool (cavity) is thus determined by the sand-binder mixture used.
  • Special ceramics such as silicon carbide or silicon nitride or aluminum oxide have a higher hardness integral than steel or aluminum.
  • silicon carbide has a better thermal conductivity than steel.
  • Binder which forms an electrolyte in dissolved form and has sufficient electrical conductivity on.
  • the present invention is further based on the general idea to provide a mold or core tool for producing molds or cores, for example.
  • a mold or core tool for producing molds or cores, for example.
  • G demkern, from a mixture of a molding material and a water-containing binder which forms an electrolyte in dissolved form and a sufficient electrical Having conductivity, the inventive mold or core tool has a consisting of at least two parts, electrically non-conductive, housing.
  • the molding or core tool moreover 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 the sand core production wherein the material is introduced once per production of the forming or core tool.
  • the material thus forms the negative contour of the sand core or the mold to be produced later therein.
  • After the mixture in the Material is embedded, is then fed to the material heat, for example by means of electricity, which leads to a curing of the mixture.
  • the housing merely constitutes a receptacle for holding the conductive material and must not be electrically conductive, since otherwise the current is passed exclusively through the housing and not through 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 are connected to one another via one or more parting planes as in previous patents, the electrodes preferably being arranged parallel to one another or even into 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.
  • the method can also be operated by means of a constant applied voltage.
  • the electrical energy in the form of alternating current or direct current can be applied to the material and sand. Be fed binder mixture. AC is available everywhere and can be regulated almost arbitrarily.
  • steam can be removed from the sand core and the material, the electrodes and the housing by means of core marks (nozzles) via bores.
  • the material may also be porous, thus allowing escape of the gases or water vapor.
  • holes are to be provided in the material for non-conductive ejector pins, which are used to remove the sand cores. These allow the removal of the sand cores after the curing of the mixture and the moving apart of the housing parts.
  • the ejector pins must be made of non-conductive material to avoid a short circuit with the system.
  • Required ejector pins are in the designated ejection holes with the base plate of
  • conductive ejector pins may also be used, as long as it is structurally ensured that they have no contact with a current-conducting material while the current is switched on.
  • Each binder has an optimal working temperature which the
  • the specific resistance curve of the desired inorganic sand-binder mixture has to be determined as a function of the temperature.
  • 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.
  • the sand-binder mixture must correspond to the mixture to be used later during production. The mixture 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
  • a feature during this process is that the material 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 core parts are brought together from their starting position and form a
  • the electric control activates the current flow and this leads to a flow of current through the material as well as through the sand core.
  • the resistance of the sand binder mixture decreases as well as in the material until the optimum resistance is almost reached. At this moment the performance entry is optimal.
  • the Sandbindergemisch has now heated from the initial temperature to about 100 to 130 ° C depending on the size within a few seconds. As soon as the free charge carriers are reduced by evaporation of the water content in the Sandbindergemisch, the specific resistance of the Sandbindergemisches to rise. At this moment, the flow of current within the sand core is reduced. In order to achieve the desired optimum operating temperature for the Sandbindergemisch now the remaining heat energy must be transferred via the core box material as well as existing procedures.
  • a particular advantage of the method is therefore particularly in the heating of the Sandbindergemisches by the good thermal conductivity of the material.
  • a Sandbindergemisch is used with an operating temperature of about 170 ° C and a Einschusstemperatur of about 20 ° C. In total, about 150 ° C are needed for heating. By means of the method can therefore 2/3 (about 100 ° C) of the required heat energy very quickly means
  • Required ejector pins for ejecting the sand core from the cavity are fastened in the ejection bores provided for this purpose and allow the sand cores to be released from the material.
  • the third process describes the cooling phase before a break or
  • 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.
  • the guidelines of the low voltage of up to 1000 V can be worked by adjusting the specific electrical resistance depending on sand core thickness. This not only gives the process a higher level of security for the employees but also reduces costs. Basically, however, higher voltages are possible as in existing patents. The rule is that the thicker the sand core the higher the tensions should be used.
  • 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 tooling materials such as steel or aluminum are a very hard material (Mohs strength 9.5) and thus extends the life of the core box due to lower wear.
  • Fig. 2 is a phase diagram with a qualitative representation of an introduced electrical power and an associated resistor in one
  • Fig. 3 is a representation of the heating by means of existing electrical
  • the housing 3 is formed of plastic, insulating ceramic or other non-conductive material and receives a 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, differ, for example, not more than in phase 2 of FIG. 2, so that in
  • 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.
  • the inorganic binder used in the mixture 9 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) and the material (7) and insulating screws (13) and angle (14) provide for attachment. Insulating screws (13) can also by
  • Alignment bolt (15) held in position.
  • Table 1 shows several series of measurements with different sand binder mixtures. The finding is that the specific electrical conductivity thereby depends on the desired sand-binder mixture and can be influenced by variation of additives and / or by changing the percentages. The stronger the electrically conductive component in the sand binder mixture, the lower the specific electrical resistance in the sand binder mixture.
  • Sandbinder mixture is not yet defined.
  • the electrically specific Property of the Sandbindergemisches targeted to influence the efficiency of the process to improve.

Landscapes

  • 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 la sélection de matériaux pour un procédé de fabrication de moules (2) ou de noyaux (2') pour la fonderie. Lors de la sélection du matériau de la boîte à noyau, à la place des métaux tels que l'acier ou l'aluminium, de préférence une céramique spéciale telle que par exemple carbure de silicium ou nitrure de silicium sont utilisés. L'invention est caractérisée en ce qu'un matériau (7) est introduit dans un boîtier (3) pour recevoir un mélange (9), le matériau comportant du carbure de silicium ou du nitrure de silicium ; en ce que de l'énergie électrique est fournie au matériau (7), par l'intermédiaire d'électrodes (10) disposées dans/sur le boîtier (3) et de la chaleur est fournie au matériau, ce qui permet d'obtenir un durcissement du mélange (9). On obtient ainsi, en raison d'une faible usure abrasive, une plus longue durée de vie des boîtes à noyau.
EP17825733.3A 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 Withdrawn EP3551359A1 (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/DE2017/101039 WO2018103792A1 (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

Publications (1)

Publication Number Publication Date
EP3551359A1 true EP3551359A1 (fr) 2019-10-16

Family

ID=61302632

Family Applications (2)

Application Number Title Priority Date Filing Date
EP17816409.1A Not-in-force 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

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP17816409.1A Not-in-force 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

Country Status (6)

Country Link
US (2) US10967420B2 (fr)
EP (2) EP3551358B1 (fr)
JP (1) JP2019536638A (fr)
CN (1) CN110248747B (fr)
DE (2) DE102017217098B3 (fr)
WO (2) WO2018103784A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE202018106268U1 (de) 2018-11-04 2018-11-28 Wolfram Bach Werkzeug zur Herstellung von Formen oder Kernen durch elektrische Widerstandserwärmung eines kunststoffbasierten Materials
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.
CN116851662A (zh) * 2023-06-26 2023-10-10 中国第一汽车股份有限公司 串联制作多个砂芯的方法及装置

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Also Published As

Publication number Publication date
JP2019536638A (ja) 2019-12-19
WO2018103792A1 (fr) 2018-06-14
CN110248747A (zh) 2019-09-17
US10967420B2 (en) 2021-04-06
US20200391279A1 (en) 2020-12-17
DE102017217098B3 (de) 2018-04-05
CN110248747B (zh) 2021-07-16
EP3551358B1 (fr) 2021-01-13
DE102017217096B3 (de) 2018-03-22
WO2018103784A1 (fr) 2018-06-14
EP3551358A1 (fr) 2019-10-16
US20200188988A1 (en) 2020-06-18

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