EP0795366A1 - Additifs pour sable de fonderie - Google Patents

Additifs pour sable de fonderie Download PDF

Info

Publication number: EP0795366A1
Authority: EP; European Patent Office
Prior art keywords: additive; cryolite; weight; sand; natural
Prior art date: 1996-03-11
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 Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Withdrawn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.)

1996-03-11

Filing date

1997-03-11

Publication date

1997-09-17

1997-03-11 Application filed by Ashland Suedchemie Kernfest GmbH filed Critical Ashland Suedchemie Kernfest GmbH

1997-09-17 Publication of EP0795366A1 publication Critical patent/EP0795366A1/fr

Status Withdrawn legal-status Critical Current

Links

239000000654 additive Substances 0.000 title claims abstract description 60
239000004576 sand Substances 0.000 title claims abstract description 19
230000000996 additive effect Effects 0.000 claims abstract description 45
238000000034 method Methods 0.000 claims abstract description 27
230000008569 process Effects 0.000 claims abstract description 24
239000000203 mixture Substances 0.000 claims abstract description 20
229910001610 cryolite Inorganic materials 0.000 claims abstract description 18
229920003002 synthetic resin Polymers 0.000 claims abstract description 13
239000000057 synthetic resin Substances 0.000 claims abstract description 13
239000002023 wood Substances 0.000 claims abstract description 13
238000004519 manufacturing process Methods 0.000 claims abstract description 12
OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
229910052799 carbon Inorganic materials 0.000 claims abstract description 7
229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 7
239000011707 mineral Substances 0.000 claims abstract description 7
239000001993 wax Substances 0.000 claims abstract description 7
150000001720 carbohydrates Chemical class 0.000 claims abstract description 6
239000002480 mineral oil Substances 0.000 claims abstract description 6
239000000025 natural resin Substances 0.000 claims abstract description 6
239000003921 oil Substances 0.000 claims abstract description 6
235000013312 flour Nutrition 0.000 claims description 11
235000014633 carbohydrates Nutrition 0.000 claims description 5
239000002657 fibrous material Substances 0.000 claims description 4
239000002817 coal dust Substances 0.000 claims description 2
239000000571 coke Substances 0.000 claims description 2
239000010439 graphite Substances 0.000 claims description 2
229910002804 graphite Inorganic materials 0.000 claims description 2
239000000843 powder Substances 0.000 abstract description 2
235000010446 mineral oil Nutrition 0.000 abstract 1
238000000465 moulding Methods 0.000 abstract 1
239000011368 organic material Substances 0.000 abstract 1
238000005266 casting Methods 0.000 description 24
UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 23
VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 18
239000011230 binding agent Substances 0.000 description 11
230000000052 comparative effect Effects 0.000 description 11
235000013980 iron oxide Nutrition 0.000 description 11
230000007547 defect Effects 0.000 description 9
239000010445 mica Substances 0.000 description 7
229910052618 mica group Inorganic materials 0.000 description 7
241001070947 Fagus Species 0.000 description 6
235000010099 Fagus sylvatica Nutrition 0.000 description 6
239000004359 castor oil Substances 0.000 description 6
235000019438 castor oil Nutrition 0.000 description 6
238000001723 curing Methods 0.000 description 6
ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 6
238000003756 stirring Methods 0.000 description 6
210000003462 vein Anatomy 0.000 description 6
XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
239000012778 molding material Substances 0.000 description 5
230000015572 biosynthetic process Effects 0.000 description 4
229910021540 colemanite Inorganic materials 0.000 description 4
238000002360 preparation method Methods 0.000 description 4
229920005989 resin Polymers 0.000 description 4
239000011347 resin Substances 0.000 description 4
238000011156 evaluation Methods 0.000 description 3
229910052742 iron Inorganic materials 0.000 description 3
238000002156 mixing Methods 0.000 description 3
235000019198 oils Nutrition 0.000 description 3
238000012360 testing method Methods 0.000 description 3
YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
-1 Polyethylene Polymers 0.000 description 2
239000004698 Polyethylene Substances 0.000 description 2
239000006004 Quartz sand Substances 0.000 description 2
238000001816 cooling Methods 0.000 description 2
230000000694 effects Effects 0.000 description 2
239000007849 furan resin Substances 0.000 description 2
239000005011 phenolic resin Substances 0.000 description 2
229920000573 polyethylene Polymers 0.000 description 2
239000004814 polyurethane Substances 0.000 description 2
229920002635 polyurethane Polymers 0.000 description 2
KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
235000007173 Abies balsamea Nutrition 0.000 description 1
239000004857 Balsam Substances 0.000 description 1
101000623895 Bos taurus Mucin-15 Proteins 0.000 description 1
VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
229910001141 Ductile iron Inorganic materials 0.000 description 1
101000950718 Homo sapiens Inositol oxygenase Proteins 0.000 description 1
244000018716 Impatiens biflora Species 0.000 description 1
102100037804 Inositol oxygenase Human genes 0.000 description 1
241001417092 Macrouridae Species 0.000 description 1
241000237503 Pectinidae Species 0.000 description 1
235000009233 Stachytarpheta cayennensis Nutrition 0.000 description 1
229920002472 Starch Polymers 0.000 description 1
239000013543 active substance Substances 0.000 description 1
150000001412 amines Chemical class 0.000 description 1
239000000440 bentonite Substances 0.000 description 1
229910000278 bentonite Inorganic materials 0.000 description 1
SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
230000033558 biomineral tissue development Effects 0.000 description 1
230000009172 bursting Effects 0.000 description 1
235000013339 cereals Nutrition 0.000 description 1
230000008859 change Effects 0.000 description 1
239000011248 coating agent Substances 0.000 description 1
238000000576 coating method Methods 0.000 description 1
238000011109 contamination Methods 0.000 description 1
238000005336 cracking Methods 0.000 description 1
238000000354 decomposition reaction Methods 0.000 description 1
238000011161 development Methods 0.000 description 1
230000018109 developmental process Effects 0.000 description 1
238000009826 distribution Methods 0.000 description 1
238000002474 experimental method Methods 0.000 description 1
239000000835 fiber Substances 0.000 description 1
238000003958 fumigation Methods 0.000 description 1
238000013007 heat curing Methods 0.000 description 1
230000006872 improvement Effects 0.000 description 1
230000003993 interaction Effects 0.000 description 1
VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 1
YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 description 1
239000000944 linseed oil Substances 0.000 description 1
235000021388 linseed oil Nutrition 0.000 description 1
229910001338 liquidmetal Inorganic materials 0.000 description 1
239000000463 material Substances 0.000 description 1
239000002184 metal Substances 0.000 description 1
229910052751 metal Inorganic materials 0.000 description 1
235000010755 mineral Nutrition 0.000 description 1
239000003110 molding sand Substances 0.000 description 1
235000019271 petrolatum Nutrition 0.000 description 1
239000003208 petroleum Substances 0.000 description 1
229920001568 phenolic resin Polymers 0.000 description 1
239000004033 plastic Substances 0.000 description 1
229920003023 plastic Polymers 0.000 description 1
238000012545 processing Methods 0.000 description 1
239000010453 quartz Substances 0.000 description 1
230000009467 reduction Effects 0.000 description 1
235000020637 scallop Nutrition 0.000 description 1
238000007711 solidification Methods 0.000 description 1
230000008023 solidification Effects 0.000 description 1
235000019698 starch Nutrition 0.000 description 1
239000008107 starch Substances 0.000 description 1
239000000126 substance Substances 0.000 description 1
230000003746 surface roughness Effects 0.000 description 1
208000024891 symptom Diseases 0.000 description 1
235000013759 synthetic iron oxide Nutrition 0.000 description 1
229910052845 zircon Inorganic materials 0.000 description 1
GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1

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
- B22C1/02—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

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
DE19609539		1996-03-11
DE19609539A DE19609539A1 (de)	1996-03-11	1996-03-11	Additive für Gießereisande
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
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

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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

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1996
- 1996-03-11 DE DE19609539A patent/DE19609539A1/de not_active Withdrawn
1997
- 1997-03-11 EP EP97104054A patent/EP0795366A1/fr not_active Withdrawn
- 1997-04-07 WO PCT/EP1997/001725 patent/WO1998045068A1/fr not_active Ceased

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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
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
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

Also Published As

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

Legal Events

Date	Code	Title	Description
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