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WO2016042378A1 - Procédé de fabrication d'une matière de moulage pour noyaux de coulée - Google Patents

Procédé de fabrication d'une matière de moulage pour noyaux de coulée Download PDF

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Publication number
WO2016042378A1
WO2016042378A1 PCT/IB2015/001580 IB2015001580W WO2016042378A1 WO 2016042378 A1 WO2016042378 A1 WO 2016042378A1 IB 2015001580 W IB2015001580 W IB 2015001580W WO 2016042378 A1 WO2016042378 A1 WO 2016042378A1
Authority
WO
WIPO (PCT)
Prior art keywords
molding material
molding sand
molding
temperature
core
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.)
Ceased
Application number
PCT/IB2015/001580
Other languages
German (de)
English (en)
Inventor
Mark ENSINGER
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.)
Nemak SAB de CV
Original Assignee
Tenedora Nemak SA de CV
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 Tenedora Nemak SA de CV filed Critical Tenedora Nemak SA de CV
Publication of WO2016042378A1 publication Critical patent/WO2016042378A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • B22C1/20—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 organic agents
    • B22C1/22—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 organic agents of resins or rosins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores

Definitions

  • the invention relates to a method for producing casting cores or moldings from a molding material.
  • Such cores and mold parts are used as parts of casting molds for the production of casting
  • Cylinder heads for internal combustion engines and the like are also cast in so-called core packages, which are all composed of a variety of complex-shaped casting cores.
  • core packages which are all composed of a variety of complex-shaped casting cores.
  • the terms “casting core” and “casting” are therefore often used interchangeably in the jargon synonymous. Accordingly, in the present text apply to the production of
  • the molding sand usually from a molding sand and a binder mixed.
  • Optional additives for adjusting the properties of the molding material can be added to this mixture. Due to the binder, the grains of the molding sand in the finished casting core or molded part are so firmly connected to each other that the casting core or the
  • Shaped part with standard dimensions are sufficiently stable even under the prevailing loads in the casting operation. Further information on the molding sands and binders which are suitable for the process according to the invention can be found at www.giessereilexikon.com.
  • the molding sands used in practice are accordingly usually mineral substances in the size range from 0.02 to 2.0 mm grain diameter.
  • quartz sand is used as foundry sand in the vast majority of applications.
  • molding sands are used, which are characterized by higher sintering points or low expansion values. These include zirconium, olivine or
  • binders are inorganic or organic
  • Resin binder for example, cure by gassing with a reaction gas or heat.
  • Inorganic binder systems are based on chemical
  • the flowability or storability of the molding material mixture can be improved.
  • a particular challenge here is that premature curing of the binder due to environmental influences must be prevented.
  • the object of the invention was to provide a method which can be used in a simple, cost-effective manner
  • This object is achieved in that in the production of cores or moldings at least the steps specified in claim 1 are traversed.
  • Characteristics of the molding material is mixed, first a portion of the molding material is provided, this molding material portion then in a core shooting machine filled and shot from the core shooter finally in a core shape, which images the respective casting core or the respective casting mold part.
  • At least the molding sand of the molding material portion is then gassed with dry CO 2 gas prior to filling the core shooting machine in such a way that the ambient air contained in the molding sand of the molding material portion is displaced.
  • dry CO 2 gas the ambient air contained in the molding sand of the molding material portion
  • the molding sand portion of the molding material portion after gassing in this way has an absolute humidity which is lower than the absolute moisture content of the molding sand of the molding material portion before the fumigation.
  • the inventively guided by the molding sand C0 2 gas thus distributes the moisture and it is a molding sand or a using this
  • Formsand the molding material portion is gassed with dry C0 2 gas, it is meant that the
  • Fumigation according to the invention with C0 2 gas can be performed as a separate, related to the molding sand alone operation, in which the molding sand is purged with C0 2 gas before mixing with the other molding material components. But it is also possible, the fumigation of the Formsands of the molding material portion in the ready mixed
  • the dehumidification achieved by the invention can be assisted by the fact that the C0 2 gas used for gassing the molding material has a temperature which is lower than the temperature of the molding sand of the molding material portion before the fumigation, so that the temperature of the molding sand after fumigation lower is the temperature of the molding sand before fumigation.
  • Binders is delayed. Produced according to the invention
  • Form material has a correspondingly extended
  • Fumigation of the molding sand or molding material may occur at any convenient location on the way from providing the components of the molding material to the core shooter
  • the fumigation of the molding sand before it is mixed with the designated binder so that the moisture of the molding sand is reduced to a minimum before it hits the binder.
  • This has a positive effect in particular when a binder is used whose reactivity decreases at lower temperatures, and the molding sand is cooled by the gassing.
  • the CC> 2 fumigation for example, immediately after the removal of the molding sand from a Formsand appointment done.
  • the gassing provided according to the invention can take place in any suitable container into which the foundry sand or molding material is filled in the course of casting core production.
  • the molding sand for example after removal from the reservoir, passes through a fluidizing device in which the molding sand is flowed through in order to improve its flow behavior with a gas flow, the gassing according to the invention can take place
  • Mixing device is carried out in which the components "molding sand", "binder” and “optional additives” are mixed into the molding material.
  • the gassing according to the invention can then be realized if the C0 2 in the form
  • the C0 2 gas stream is formed by the C0 2 gas formed by heating the C0 2 piece as a result of contact with the components of the molding material and changes its state of aggregation from solid to gaseous.
  • the lumpy introduction of the C0 2 in the respective container for example in the form of a C0 2 granules or in the form of one or more C0 2 blocks or the like. Under normal conditions carbon dioxide is certainly present in solid, lumpy form, when the temperature of each C0 2 piece at the time of
  • the temperature of the C0 2 exceeds the critical for the state of aggregate state temperature.
  • Weight, the measured moisture and the measured temperature of the molding sand and the volume of each container to be fumigated determined.
  • the fumigation can also be controlled moisture-dependent. This will be
  • the humidity of the gassed molding material or foundry sand and also here the fumigation with C0 2 gas maintained until the moisture has reached a predetermined target minimum value.
  • An optimal function of the core shooter used for shooting the cores and moldings which, as usual, has at least one shooting nozzle from which the molding material is shot into the core mold, can be achieved that the core shooter at least in the shooting nozzle in itself
  • the temperatures are the
  • the molded material produced according to the invention also makes it possible, by its low moisture content qualitatively
  • the invention is based on a
  • Fig. 1 shows a plant for the manufacture of casting cores in
  • Fig. 2 shows the time course of the temperature
  • the plant A shown in FIG. 1 is part of a core shop, not shown here further, which produces casting cores G for casting molds in continuous operation, which are intended for the production by casting of cylinder heads from an aluminum melt.
  • the installation A comprises a core shooting machine 1, which shoots a portion of molding material F into the mold cavity G forming mold cavity 2 of a core mold 3.
  • the core shooting machine 1 includes in itself
  • Shot cap 6 the shooting plate 5 and the shooting nozzles 4 are connected to a cooling system 7, which
  • Shot cap 6 the shooting plate 5 and the shooting nozzles 4 at a temperature of about 22 ° C holds.
  • the firing hood 6 bounds with the weft plate 5 a space into which the portion of molding material F to be shot into the core mold 3 is filled via a filling funnel 8.
  • the hopper 8 may also be connected to an active, not shown cooling device to keep its coming into contact with the filler surfaces at a temperature of 22 ° C maximum.
  • the molding material F passes through a suitable, also known per se, here for the sake of clarity not shown conveyor of a
  • Mixing device 9 is the molding material F in one Mixing container 10 mixed from a portion of molding sand S and a binder B.
  • the molding sand S is conventional quartz sand obtained in whole or in part by recycling foundry cores G destroyed during the coring of the respective casting, and one
  • the binder B is, for example, a conventional cold-binder process by gassing with a reaction gas-curing organic binder system, also known from practice, in the hot-box process by
  • Heat-curing binder system or a
  • additives can be added to the molding material F to positively influence its processing properties.
  • the molding sand S is in a storage silo 11th
  • the temperature of the molding sand S in the storage silo 11 is 38-40 ° C.
  • the molding sand S is filled via a portioning device 12 into the mixing container 10 of the mixing device 9.
  • the portioning device 12 can likewise be connected to a cooling device 13, which cools the surfaces of the portioning device 12 that come into contact with the molding sand S to such an extent that the molding sand S portioned in the portioning device 12 is cooled to a temperature of 32-35 ° C.
  • the gassing according to the invention takes place in the course of
  • Blender 9 given C0 2 dry ice C is vaporized.
  • the residual moisture remaining in the molding sand after pre-mixing is less than 1 g / m 3 immediately after mixing, compared to a moisture content of 47 g / m 3 before premixing.
  • the temperature of the molding sand S in the mixing container 10 is continuously monitored during mixing and, if necessary, further lumpy C02 ⁇ dry ice C in the mixing container 10, until the molding sand S has reached the target temperature of 15 ° C.
  • the molding material F mixed ready in the usual way and promoted to the core shooter 1.
  • the number of shots scored with the core shooting machine 1 per hour operated with inventive molding material F was up to 30% higher than that of a core shooting machine operated with untreated molding material F.
  • the time intervals in which the shot nozzles had to be cleaned could be extended 15 to 20 times compared to the maintenance intervals, in those operated with untreated molding material
  • a first transient phase A is the

Landscapes

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

Abstract

L'invention concerne un procédé de fabrication de noyaux de coulée (G) ou d'éléments de moule à partir d'une matière de moulage (F) qui est obtenue par mélange des composants « sable de moulage (S) », « liant (B) », ainsi que le cas échéant au moins un additif pour ajuster les propriétés de la matière de moulage (F), procédé selon lequel une partie de la matière de moulage (F) est préparée, introduite dans une machine à tirer les noyaux (1) et tirée de la machine à tirer les noyaux (1) jusque dans une boîte à noyaux (3) qui reproduit le noyau de coulée respectif (G) ou l'élément de moule respectif. En raison du fait qu'au moins le sable de moulage (S) de la partie de matière de moulage est gazé avec du gaz CO2 sec (CG) avant le remplissage de la machine à tirer les noyaux (1) de sorte que l'air ambiant contenu dans le sable de moulage (S) de la partie de matière de moulage est déplacé et que le sable de moulage (S) de la partie de matière de moulage présente après le gazage une humidité absolue qui est inférieure à l'humidité absolue du sable de moulage (S) de la partie de matière moulage avant le gazage, on peut fabriquer de manière simple et à bon marché des noyaux de coulée et des éléments de moule en utilisant une matière de moulage qui est formée par mélange à partir des composants connus et qui satisfait parfaitement aux exigences résultant de la pratique.
PCT/IB2015/001580 2014-09-19 2015-09-11 Procédé de fabrication d'une matière de moulage pour noyaux de coulée Ceased WO2016042378A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014113529.6A DE102014113529A1 (de) 2014-09-19 2014-09-19 Verfahren zum Herstellen eines Formstoffes für Gießkerne
DE102014113529.6 2014-09-19

Publications (1)

Publication Number Publication Date
WO2016042378A1 true WO2016042378A1 (fr) 2016-03-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2015/001580 Ceased WO2016042378A1 (fr) 2014-09-19 2015-09-11 Procédé de fabrication d'une matière de moulage pour noyaux de coulée

Country Status (2)

Country Link
DE (1) DE102014113529A1 (fr)
WO (1) WO2016042378A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111644568A (zh) * 2020-07-17 2020-09-11 安徽莱恩电泵有限公司 一种铸造叶轮铸造用模具
CN112792300A (zh) * 2020-12-31 2021-05-14 沈阳汇亚通铸造材料有限责任公司 一种用温芯盒制砂芯的方法及砂芯
CN115780746A (zh) * 2022-11-15 2023-03-14 宁国科博尔智能机床有限公司 一种砂型模成型模具

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018206006A1 (de) * 2018-01-11 2019-07-11 Evonik Degussa Gmbh Verfahren zur Herstellung von Kunststein
RU2735607C1 (ru) * 2020-06-15 2020-11-05 федеральное государственное бюджетное образовательное учреждение высшего образования "Нижегородский государственный технический университет им. Р.Е. Алексеева" (НГТУ) Способ изготовления литейных стержней и форм из жидкостекольных смесей
DE102023204391A1 (de) 2023-05-11 2024-11-14 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eingetragener Verein Verfahren und System zur Herstellung eines Gießwerkzeugs oder eines Gießwerkzeugteils

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2331159A1 (de) * 1972-06-29 1974-01-17 Automatisme Et Tech Arcueil Verfahren zur herstellung von gussformen und gusskernen sowie verfahrensgemaess hergestellte erzeugnisse
JPS51147427A (en) * 1975-06-13 1976-12-17 Mitsubishi Heavy Ind Ltd Method of hardening mold
SU718215A1 (ru) * 1978-09-21 1980-02-29 Предприятие П/Я А-3470 Способ изготовлени замороженных форм
JPS5570439A (en) * 1978-11-20 1980-05-27 Agency Of Ind Science & Technol Extension method of service life of self-hardening mold sand
JPS5584249A (en) * 1978-12-16 1980-06-25 Nippon Sanso Kk Production of mold
GB2044147A (en) * 1978-10-25 1980-10-15 Boc Ltd Cooling method
GB1601664A (en) * 1978-05-26 1981-11-04 Boc Ltd Method of making moulds
US4304286A (en) * 1978-05-26 1981-12-08 Boc Limited Making moulds
JPS5781937A (en) * 1980-11-11 1982-05-22 Natl Res Inst For Metals Manufacture of exothermic self-hardening water-soluble mold

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2331159A1 (de) * 1972-06-29 1974-01-17 Automatisme Et Tech Arcueil Verfahren zur herstellung von gussformen und gusskernen sowie verfahrensgemaess hergestellte erzeugnisse
JPS51147427A (en) * 1975-06-13 1976-12-17 Mitsubishi Heavy Ind Ltd Method of hardening mold
GB1601664A (en) * 1978-05-26 1981-11-04 Boc Ltd Method of making moulds
US4304286A (en) * 1978-05-26 1981-12-08 Boc Limited Making moulds
SU718215A1 (ru) * 1978-09-21 1980-02-29 Предприятие П/Я А-3470 Способ изготовлени замороженных форм
GB2044147A (en) * 1978-10-25 1980-10-15 Boc Ltd Cooling method
JPS5570439A (en) * 1978-11-20 1980-05-27 Agency Of Ind Science & Technol Extension method of service life of self-hardening mold sand
JPS5584249A (en) * 1978-12-16 1980-06-25 Nippon Sanso Kk Production of mold
JPS5781937A (en) * 1980-11-11 1982-05-22 Natl Res Inst For Metals Manufacture of exothermic self-hardening water-soluble mold

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111644568A (zh) * 2020-07-17 2020-09-11 安徽莱恩电泵有限公司 一种铸造叶轮铸造用模具
CN112792300A (zh) * 2020-12-31 2021-05-14 沈阳汇亚通铸造材料有限责任公司 一种用温芯盒制砂芯的方法及砂芯
CN115780746A (zh) * 2022-11-15 2023-03-14 宁国科博尔智能机床有限公司 一种砂型模成型模具
CN115780746B (zh) * 2022-11-15 2025-11-11 宁国科博尔智能机床有限公司 一种砂型模成型模具

Also Published As

Publication number Publication date
DE102014113529A1 (de) 2016-03-24

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