EP0795366A1 - Additifs pour sable de fonderie - Google Patents

Additifs pour sable de fonderie Download PDF

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Publication number
EP0795366A1
EP0795366A1 EP97104054A EP97104054A EP0795366A1 EP 0795366 A1 EP0795366 A1 EP 0795366A1 EP 97104054 A EP97104054 A EP 97104054A EP 97104054 A EP97104054 A EP 97104054A EP 0795366 A1 EP0795366 A1 EP 0795366A1
Authority
EP
European Patent Office
Prior art keywords
additive
cryolite
weight
sand
natural
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Withdrawn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
EP97104054A
Other languages
German (de)
English (en)
Inventor
Diether Dr. Rer. Nat. Koch
Andreas Dr. Rer. Nat. Werner
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.)
Ashland Suedchemie Kernfest GmbH
Original Assignee
Ashland Suedchemie Kernfest 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 Ashland Suedchemie Kernfest GmbH filed Critical Ashland Suedchemie Kernfest GmbH
Publication of EP0795366A1 publication Critical patent/EP0795366A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C1/00Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/02Compositions 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

Definitions

  • the invention relates to compositions containing foundry sand and additive, the additive comprising cryolite.
  • the additive is used in the manufacture of foundry cores and molds, especially those bonded with synthetic resins, to prevent casting defects.
  • leaf ribs A e.g. Casting defects that are frequently encountered are known under the term "leaf ribs", the susceptibility to this defect being quite different in the individual core production processes.
  • the appearance of leaf ribs means increased costs due to extra work, since they sometimes have to be ground away with great effort. But it can also lead to the casting being unusable if the leaf ribs are in inaccessible places.
  • the thickness of the oxidic binder shells that surround the grains of sand have fundamental sand properties that are essential for their formation of casting defects are decisive; taking into account the stress conditions, the composition of sand mixtures can be controlled via the amount of iron oxide added.
  • iron oxide also has disadvantages: due to its basicity, it shortens the processing time of cold box binders, and on the other hand it contributes greatly to the contamination of core manufacturing tools. The latter applies above all to finely ground, synthetic iron oxide.
  • iron oxide is often a component of commercially available additives.
  • Other active substances are e.g. Wood flour, minerals, carbohydrates, carbon, natural oils, mineral oils, waxes, natural and synthetic resins etc.
  • cryolite or cryolite-containing additives to the foundry sand fulfills the stated task.
  • cryolite enables a reduction in the amount of additive. This leads to an improvement in the casting surface, since conventional additives, especially wood meal-like additives, can cause increased surface roughness due to gas formation during pyrolytic decomposition.
  • the additive according to the invention is added in an amount of 0.1 to 10% by weight, based on the sand.
  • 0.1 to 7.5 wt .-% are used; the range from 0.1 to 5% by weight is particularly preferred.
  • cryolite can be used alone as an additive or mixed with at least one component composed of minerals, wood flour, organic fiber material, carbohydrates, carbon, natural oils, mineral oils, waxes, natural resins and synthetic resins.
  • Suitable minerals are, for example, colemanite, mica and iron oxide.
  • a suitable wood flour is beech wood flour, for example.
  • Polyethylene fibers are an example of suitable organic fiber material and as a carbohydrate
  • starch can be used.
  • Suitable natural oils are castor oil and linseed oil, while petroleum is an example of suitable mineral oils.
  • polyethylene wax and petroleum jelly can be used as waxes.
  • Balsam resin for example, can be used as the natural resin component in the additive, while phenolic resin solutions, for example, can be used as synthetic resins. If carbon is used as an additive component in addition to cryolite, it can be used, for example, in the form of coke and / or graphite and / or hard coal dust.
  • Recycled foundry sand can also be used as sand.
  • the additives according to the invention can be used both in the gas-curing process (eg cold box process) and in the warm box process, the hot box process, the croning process or the cold curing process (eg polyurethane cold resin) . Because the cold box process is particularly susceptible to leaf vein formation, the following experiments have been concentrated on this process.
  • step cones were produced using the cold box method from quartz sand and a commercially available cold box binder (Isocure 300 OS4 / Isocure 600 OS4) from Ashland-Südchemie-Kernfest GmbH.
  • the additive added was 0.5% by weight or 2.4% by weight based on sand, depending on the composition of the additive.
  • the step cones were also placed in molds bonded with a synthetic resin (Pep Set 1505 / Pep Set 602 from Ashland-Südchemie Kernfest GmbH) and cast with spheroidal graphite cast iron (GGG 50) at 1398 to 1430 ° C.
  • the step cone is a well-known test specimen which can be used to examine the thermal load during casting on a core (see also DM Gilson et al., Modern Casting, May 1995, pages 38-40).
  • the thermal load is lowest at level 1, at level 6 against it the strongest. The number of leaf veins therefore increases from level 1 to level 6.
  • the cavity between the core and the outer form is filled with the liquid metal.
  • the casting is cleaned of adhering sand and, to assess the effectiveness of the additive, the leaf ribs which have formed on the individual stages of the casting are counted. The result is shown in Table I.
  • cryolite and colemanite are successively filled with stirring in a laboratory wing mixer and mixed for about 10 minutes to homogenize the two components.
  • the additive is prepared analogously to Example 3, but in this example it has the following composition: Beech wood flour (45% by weight), cryolite (19.5% by weight), mica (19.5% by weight; Suzorite Mica, Suzorite Mica Products, Canada) castor oil (6% by weight) and one commercially Resin solution available from Ashland-Südchemie-Kernfest GmbH (13% by weight).
  • the additive is prepared analogously to Example 3, but in this example it has the following composition: Beech wood flour (55% by weight), cryolite (13% by weight), mica (13% by weight), castor oil (6% by weight) and a commercially available synthetic resin solution from Ashland-Südchemie-Kernfest GmbH (13% by weight) .-%).
  • the step cone is produced as described in Example 1. However, 72 g (2.4% by weight) of additive BR 028/1, a commercially available iron oxide-free additive from Ashland-Südchemie-Kernfest GmbH, are used as the additive. The result of the assessment of the casting is shown in Table I.
  • the step cone is produced analogously to Example 1, but 72 g (2.4% by weight) of BR 85 additive are used as additives R, a commercially available additive containing iron oxide from Ashland-Südchemie-Kernfest GmbH. The number of leaf veins that have occurred is shown in Table I.
  • the step cone is produced analogously to Example 1, but 15 g (0.5% by weight) of colemanite are used as an additive.
  • the number of leaf veins that have occurred is shown in Table I.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
EP97104054A 1996-03-11 1997-03-11 Additifs pour sable de fonderie Withdrawn EP0795366A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19609539A DE19609539A1 (de) 1996-03-11 1996-03-11 Additive für Gießereisande
DE19609539 1996-03-11
PCT/EP1997/001725 WO1998045068A1 (fr) 1996-03-11 1997-04-07 Adjuvant pour sable de fonderie

Publications (1)

Publication Number Publication Date
EP0795366A1 true EP0795366A1 (fr) 1997-09-17

Family

ID=26023684

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97104054A Withdrawn EP0795366A1 (fr) 1996-03-11 1997-03-11 Additifs pour sable de fonderie

Country Status (3)

Country Link
EP (1) EP0795366A1 (fr)
DE (1) DE19609539A1 (fr)
WO (1) WO1998045068A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998045068A1 (fr) * 1996-03-11 1998-10-15 Ashland-Südchemie-Kernfest GmbH Adjuvant pour sable de fonderie
WO2012104096A1 (fr) * 2011-02-04 2012-08-09 Ask Chemicals L.P. Additifs à base de sable pour moules/noyaux pour la fonte de métaux
CN101541984B (zh) * 2007-02-12 2013-01-30 巴西南扩科有限公司 在铸塑成型的湿型砂组分中使用的含有水溶性碳水化合物的添加煤尘
WO2019224070A1 (fr) 2018-05-25 2019-11-28 Ask Chemicals Gmbh Composition de poteyage, procédé de revêtement d'un moule de coulée et utilisation de la composition de poteyage pour le revêtement d'un moule de coulée
WO2020212433A1 (fr) 2019-04-16 2020-10-22 Ask Chemicals Gmbh Composition de revêtement, procédé de revêtement d'un moule de coulée, utilisation de la composition de revêtement permettant le revêtement d'un moule de coulée et moule de coulée

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10326967A1 (de) 2003-06-12 2004-12-30 Iko Minerals Gmbh Verfahren zur Herstellung eines Kern- und Formsandes für Gießereizwecke
DE102013004663B4 (de) 2013-03-18 2024-05-02 Ask Chemicals Gmbh Bindemittelsystem, Formstoffmischung enthaltend dasselbe, Verfahren zur Herstellung der Formstoffmischung, Verfahren zur Herstellung eines Gießformteils oder Gießkerns, Gießformteil oder Gießkern sowie Verwendung des so erhältlichen Gießformteils oder Gießkerns für den Metallguss
CN112371901B (zh) * 2020-09-14 2022-06-28 盐城仁创砂业科技有限公司 一种用于铸造的防脉纹添加剂、制备方法及使用方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB838050A (en) * 1955-04-28 1960-06-22 Oswald Emblem Improvements in or relating to shell moulds
SU465259A1 (ru) * 1973-07-13 1975-03-30 Предприятие П/Я Г-4448 Смазка дл прессформ лить под давлением
SU512852A1 (ru) * 1974-05-28 1976-05-05 Каширский Литейный Завод "Центролит" Суспензи дл изготовлени литейных керамических форм, получаемых по выплавл емым модел м
SU592507A1 (ru) * 1976-10-25 1978-02-15 Ждановский металлургический институт Смесь дл изготовлени литейных керамических форм и стержней
US4088624A (en) * 1975-12-26 1978-05-09 Societe D'applications De Procedes Industriels Et Chimiques S.A.P.I.C. Self-hardening molding compositions
SU722653A1 (ru) * 1978-06-01 1980-03-25 Научно-Исследовательский Институт Специальных Способов Литья Разделительное покрытие дл нагреваемой модельной оснастки
SU1614884A1 (ru) * 1988-12-08 1990-12-23 Предприятие П/Я А-3697 Самотвердеюща смесь дл изготовлени форм и стержней при литье магниевых сплавов

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
DE823480C (de) * 1950-05-05 1951-12-03 Bayer Ag Formmassen zur Herstellung von bei Giesstemperaturen formbestaendigen Giessereiformmasken
ZA792535B (en) * 1978-05-30 1980-06-25 Foseco Trading Ag Heat-insulating articles
DE3049174C2 (de) * 1980-12-24 1983-03-10 Raschig Gmbh, 6700 Ludwigshafen Kalthärtende Formmasse zur Vermeidung der Bildung von Blattrippen
JPH06135763A (ja) * 1992-10-29 1994-05-17 Harima Ceramic Co Ltd 連続鋳造用耐火物
JPH08157267A (ja) * 1994-11-30 1996-06-18 Harima Ceramic Co Ltd 流し込み施工用不定形耐火物
DE19609539A1 (de) * 1996-03-11 1997-09-18 Ashland Suedchemie Kernfest Additive für Gießereisande

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB838050A (en) * 1955-04-28 1960-06-22 Oswald Emblem Improvements in or relating to shell moulds
SU465259A1 (ru) * 1973-07-13 1975-03-30 Предприятие П/Я Г-4448 Смазка дл прессформ лить под давлением
SU512852A1 (ru) * 1974-05-28 1976-05-05 Каширский Литейный Завод "Центролит" Суспензи дл изготовлени литейных керамических форм, получаемых по выплавл емым модел м
US4088624A (en) * 1975-12-26 1978-05-09 Societe D'applications De Procedes Industriels Et Chimiques S.A.P.I.C. Self-hardening molding compositions
US4088624B1 (fr) * 1975-12-26 1985-03-26
SU592507A1 (ru) * 1976-10-25 1978-02-15 Ждановский металлургический институт Смесь дл изготовлени литейных керамических форм и стержней
SU722653A1 (ru) * 1978-06-01 1980-03-25 Научно-Исследовательский Институт Специальных Способов Литья Разделительное покрытие дл нагреваемой модельной оснастки
SU1614884A1 (ru) * 1988-12-08 1990-12-23 Предприятие П/Я А-3697 Самотвердеюща смесь дл изготовлени форм и стержней при литье магниевых сплавов

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 7552, Derwent World Patents Index; Class H07, AN 75-86103W, XP002033761 *
DATABASE WPI Section Ch Week 7726, Derwent World Patents Index; Class L02, AN 77-46508Y, XP002033758 *
DATABASE WPI Section Ch Week 7901, Derwent World Patents Index; Class M22, AN 79-01405B, XP002033759 *
DATABASE WPI Section Ch Week 8044, Derwent World Patents Index; Class M22, AN 80-78428C, XP002033760 *
DATABASE WPI Week 9135, Derwent World Patents Index; AN 91-258333, XP002033757 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998045068A1 (fr) * 1996-03-11 1998-10-15 Ashland-Südchemie-Kernfest GmbH Adjuvant pour sable de fonderie
CN101541984B (zh) * 2007-02-12 2013-01-30 巴西南扩科有限公司 在铸塑成型的湿型砂组分中使用的含有水溶性碳水化合物的添加煤尘
WO2012104096A1 (fr) * 2011-02-04 2012-08-09 Ask Chemicals L.P. Additifs à base de sable pour moules/noyaux pour la fonte de métaux
WO2019224070A1 (fr) 2018-05-25 2019-11-28 Ask Chemicals Gmbh Composition de poteyage, procédé de revêtement d'un moule de coulée et utilisation de la composition de poteyage pour le revêtement d'un moule de coulée
EP4147804A1 (fr) 2018-05-25 2023-03-15 ASK Chemicals GmbH Composition d'encollage, procédé de revêtement d'un moule de coulée et utilisation de la composition d'encollage pour revêtement d'un moule de coulée
WO2020212433A1 (fr) 2019-04-16 2020-10-22 Ask Chemicals Gmbh Composition de revêtement, procédé de revêtement d'un moule de coulée, utilisation de la composition de revêtement permettant le revêtement d'un moule de coulée et moule de coulée
DE102019002802A1 (de) * 2019-04-16 2020-10-22 Ask Chemicals Gmbh Schlichtezusammensetzung, Verfahren zur Beschichtung einer Gießform, Verwendung der Schlichtezusammensetzung zur Beschichtung einer Gießform und Gießform

Also Published As

Publication number Publication date
DE19609539A1 (de) 1997-09-18
WO1998045068A1 (fr) 1998-10-15

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