EP0917499B1 - Verfahren zur herstellung von kernformlingen und umlaufkernsand für giessereizwecke - Google Patents

Verfahren zur herstellung von kernformlingen und umlaufkernsand für giessereizwecke Download PDF

Info

Publication number: EP0917499B1
Authority: EP; European Patent Office
Prior art keywords: core; sand; core box; bonding agent; mixture
Prior art date: 1996-08-09
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.): Expired - Lifetime

Application number

EP97934549A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP0917499A2 (de

Inventor

Thomas Steinhäuser

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.)

Vaw Aluminium AG

Original Assignee

Vereinigte Aluminium Werke AG

Vaw Aluminium AG

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.)

1996-08-09

Filing date

1997-07-26

Publication date

2000-11-22

1997-07-26 Application filed by Vereinigte Aluminium Werke AG, Vaw Aluminium AG filed Critical Vereinigte Aluminium Werke AG

1999-05-26 Publication of EP0917499A2 publication Critical patent/EP0917499A2/de

2000-11-22 Application granted granted Critical

2000-11-22 Publication of EP0917499B1 publication Critical patent/EP0917499B1/de

2017-07-26 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

238000000034 method Methods 0.000 title claims abstract description 36
239000004576 sand Substances 0.000 title claims abstract description 29
238000004519 manufacturing process Methods 0.000 title claims abstract description 10
238000004064 recycling Methods 0.000 title 1
NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 15
239000000203 mixture Substances 0.000 claims abstract description 14
235000019353 potassium silicate Nutrition 0.000 claims abstract description 11
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
238000001035 drying Methods 0.000 claims abstract description 7
230000000694 effects Effects 0.000 claims abstract description 4
238000000053 physical method Methods 0.000 claims abstract 2
238000000465 moulding Methods 0.000 claims description 21
239000000463 material Substances 0.000 claims description 11
238000002156 mixing Methods 0.000 claims description 7
238000002844 melting Methods 0.000 claims description 4
230000008018 melting Effects 0.000 claims description 4
239000007787 solid Substances 0.000 claims description 2
VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims 9
239000007767 bonding agent Substances 0.000 claims 9
239000006004 Quartz sand Substances 0.000 claims 2
CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims 1
230000009970 fire resistant effect Effects 0.000 claims 1
239000011230 binding agent Substances 0.000 abstract description 24
238000003860 storage Methods 0.000 description 33
239000012778 molding material Substances 0.000 description 23
239000000047 product Substances 0.000 description 14
UEEJHVSXFDXPFK-UHFFFAOYSA-N N-dimethylaminoethanol Chemical compound CN(C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-N 0.000 description 13
238000005452 bending Methods 0.000 description 13
239000012972 dimethylethanolamine Substances 0.000 description 13
239000007789 gas Substances 0.000 description 6
239000004593 Epoxy Substances 0.000 description 5
238000007906 compression Methods 0.000 description 4
230000006835 compression Effects 0.000 description 4
239000000126 substance Substances 0.000 description 4
238000012360 testing method Methods 0.000 description 4
239000004115 Sodium Silicate Substances 0.000 description 3
230000015572 biosynthetic process Effects 0.000 description 3
238000005266 casting Methods 0.000 description 3
239000003110 molding sand Substances 0.000 description 3
239000011347 resin Substances 0.000 description 3
229920005989 resin Polymers 0.000 description 3
229910052911 sodium silicate Inorganic materials 0.000 description 3
208000005156 Dehydration Diseases 0.000 description 2
239000000654 additive Substances 0.000 description 2
230000000052 comparative effect Effects 0.000 description 2
230000018044 dehydration Effects 0.000 description 2
238000006297 dehydration reaction Methods 0.000 description 2
230000007613 environmental effect Effects 0.000 description 2
150000002148 esters Chemical class 0.000 description 2
239000011521 glass Substances 0.000 description 2
238000010438 heat treatment Methods 0.000 description 2
238000005457 optimization Methods 0.000 description 2
238000012545 processing Methods 0.000 description 2
238000000926 separation method Methods 0.000 description 2
230000008646 thermal stress Effects 0.000 description 2
239000002699 waste material Substances 0.000 description 2
238000004364 calculation method Methods 0.000 description 1
238000006243 chemical reaction Methods 0.000 description 1
239000007795 chemical reaction product Substances 0.000 description 1
238000012733 comparative method Methods 0.000 description 1
238000001816 cooling Methods 0.000 description 1
229920001971 elastomer Polymers 0.000 description 1
238000005516 engineering process Methods 0.000 description 1
-1 ester compounds Chemical class 0.000 description 1
238000002474 experimental method Methods 0.000 description 1
238000009472 formulation Methods 0.000 description 1
239000007769 metal material Substances 0.000 description 1
239000011368 organic material Substances 0.000 description 1
239000007800 oxidant agent Substances 0.000 description 1
230000000704 physical effect Effects 0.000 description 1
239000004033 plastic Substances 0.000 description 1
239000004848 polyfunctional curative Substances 0.000 description 1
230000002265 prevention Effects 0.000 description 1
230000001737 promoting effect Effects 0.000 description 1
239000002994 raw material Substances 0.000 description 1
230000008929 regeneration Effects 0.000 description 1
238000011069 regeneration method Methods 0.000 description 1
238000012958 reprocessing Methods 0.000 description 1
229920003987 resole Polymers 0.000 description 1
238000007493 shaping process Methods 0.000 description 1
239000004575 stone Substances 0.000 description 1
229920001187 thermosetting polymer Polymers 0.000 description 1
238000012546 transfer Methods 0.000 description 1

Images

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
- 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
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening

Definitions

the invention relates to a method for producing core moldings for foundry technology, whereby a mixture of an inorganic, fireproof molding sand and an inorganic Binder made of water glass, which The mixture is poured into a tempered core box, which is in the Water contained in the mixture is physically extracted and the core preform is removed from the core box and a Process for the production of circulating core sand.
test samples consisted of a compressed sand-sodium silicate mixture.
a vacuum was applied in the Range of 0.5 to 3 mm Hg applied and held as long as up to 10 to 30% of the moisture could be removed from the binder.
the only non-organic binder material mentioned in the article by Cole is a sodium silicate binder, which, however, is either mixed with complex ester hardeners or is subjected to a "chemical drying process" using "conventional” CO 2 gassing systems.
ester compounds are not recommended because of the environmental problems mentioned above.
WO-A-86/00033 describes a process for the production of Core moldings known in the form of sand with water glass as Binder is mixed. The mixture is placed in the core box Exposure to microwave water. There is the Core box made of a material permeable to microwaves, e.g. Plastic, rubber or a multi-layer non-metallic Material.
the object of the present invention is now a method develop for the production of core moldings for foundry purposes, that does not have the disadvantages described above. This object is achieved by the in claim 1 specified features solved.
the new process is intended to produce complex shaped large series parts in an environmentally friendly, energy-efficient production method are produced in particular as large-volume core moldings can have a sufficient bending strength for handling and a "smooth" compared to previous core sand surfaces Surface and the complete waiver of decay promoting Additives allowed.
reprocessing of the "old sand" is intended for any separation or splitting off from Z.
organic substances and wet chemical treatment the old sand can be dispensed with and still a circulating core sand can be produced with such physical properties, those with those of the natural raw material originally used are identical.
Figure 1 includes a representation comparison of different Molding binder systems under constantly defined conditions.
the mold storage time is designated 0 minutes, d. H. the molding material becomes molded articles immediately after mixing processed.
the core storage time is 60 minutes, d. H. the molded part is shaped according to the given shape Time stored and then broken.
the product according to the invention was produced in a rocking mixer with a mixing time of 50 seconds from 5 kg of molding sand H32 with 2.5% binder and processed on a core shooter of the H 2.5 type, the molding sand in a temperature-controlled core box being exposed to a negative pressure during the filling .
the tool temperature was 150 ° C.
the compression took place at 2.5 bar overpressure.
the resulting gases were extracted with a flow rate of 4 m 3 / h (corresponding to a vacuum of 0.6 bar) before the mold was opened.
the core molding was dried in the microwave (600 watts) for 120 seconds.
FIG. 1 shows the associated bending strengths with a thinly hatched column with a molding material storage time of 0 min and a core storage time of 60 min.
a comparative product was produced using the resol-CO 2 process and with 2.7% binder type.
the mixing time was 70 seconds, the compression was carried out under negative pressure at -0.8 bar.
the comparison product was then cured in a CO 2 atmosphere at 1 bar for 8.5 seconds.
the results are compared in FIG. 1 as a "CO 2 " column with the same molding material storage times of 0 and core storage times of 60 minutes compared to the data according to the invention.
CB1, CB2, CB3 Cold Box
0.8 / 0.8% DMEA 0.8 / 0.8% DMEA
SO 2 -gassed sand system with 1% EPOXY / 0.25% resin and oxidizer has been manufactured and tested.
the bending strengths of the core moldings according to the invention have significantly better values than the SO 2 and CO 2 hardened moldings if the cores are removed from the mold immediately without storage.
Figure 5 is the representation of Figure 4 by different Mold storage times added. No figure shows the comparison of regenerates at different core storage times because the Comparative method a stability of the moldings only after removal allow the organic components.
the gas volume is displayed system-adjusted, ie the dead volume is taken into account by calculation.
Test duration 7.5 minutes under thermal stress.
the sand systems were manufactured on the basis of H 32 new sand. For a separate comparison, a sample of unpolluted H 32 new sand was inserted for comparison.

Landscapes

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

EP97934549A 1996-08-09 1997-07-26 Verfahren zur herstellung von kernformlingen und umlaufkernsand für giessereizwecke Expired - Lifetime EP0917499B1 (de)

Applications Claiming Priority (3)

Application Number	Priority Date	Filing Date	Title
DE19632293A DE19632293C2 (de)	1996-08-09	1996-08-09	Verfahren zur Herstellung von Kernformlingen für die Gießereitechnik
DE19632293		1996-08-09
PCT/EP1997/004072 WO1998006522A2 (de)	1996-08-09	1997-07-26	Verfahren zur herstellung von kernformlingen und umlaufkernsand für giessereizwecke

Publications (2)

Publication Number	Publication Date
EP0917499A2 EP0917499A2 (de)	1999-05-26
EP0917499B1 true EP0917499B1 (de)	2000-11-22

Family

ID=7802305

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP97934549A Expired - Lifetime EP0917499B1 (de)	1996-08-09	1997-07-26	Verfahren zur herstellung von kernformlingen und umlaufkernsand für giessereizwecke

Country Status (7)

Country	Link
EP (1)	EP0917499B1 (da)
AT (1)	ATE197683T1 (da)
DE (2)	DE19632293C2 (da)
DK (1)	DK0917499T3 (da)
ES (1)	ES2153677T3 (da)
HU (1)	HU222658B1 (da)
WO (1)	WO1998006522A2 (da)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE10144391C1 (de) *	2001-09-10	2002-10-17	Vaw Mandl & Berger Gmbh Linz	Verfahren und Formschießmaschine zum Herstellen von Formteilen, wie Gießkernen, für Gießformen zum Vergießen von Metallschmelze
DE10144193C1 (de) *	2001-09-08	2002-10-31	Vaw Mandl & Berger Gmbh Linz	Verfahren und Formschießmaschine zum Herstellen von Formteilen, wie Gießkernen, für Gießformen zum Vergießen von Metallschmelze
DE10209183A1 (de) *	2002-03-04	2003-10-02	Vaw Mandl & Berger Gmbh Linz	Formstoff für die Herstellung von Gießformteilen
DE10209224A1 (de) *	2002-03-04	2003-10-09	Vaw Mandl & Berger Gmbh Linz	Verfahren zum Herstellen von Gußstücken
WO2010025861A1 (de) *	2008-09-05	2010-03-11	Minelco Gmbh	Mit wasserglas beschichteter und/oder vermischter kern- oder formsand mit einem wassergehalt im bereich von≥etwa 0,25 gew.-% bis etwa 0,9 gew.-%
US10232430B2 (en)	2007-10-30	2019-03-19	Ask Chemicals Gmbh	Mould material mixture having improved flowability

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE29925011U1 (de)	1999-10-26	2008-10-02	Minelco Gmbh	Giessereikern-Bindemittelsystem
JP2005508252A (ja) *	2001-08-10	2005-03-31	ディプローム−インジェニエールレムペゲゼルシャフトミットベシュレンクテルハフツング	鋳造目的のための鋳型または中子を製造するための方法および装置
DE10200927A1 (de) *	2001-08-10	2003-03-06	Laempe Joachim	Verfahren und Vorrichtung zur Herstellung von Formen oder Kernen für Giessereizwecke
CA2461797A1 (en) *	2001-09-14	2003-03-27	Bernhard Stauder	Method for producing castings, molding sand and its use for carrying out said method
DE10216464B4 (de) *	2002-04-12	2004-04-15	Deutsches Zentrum für Luft- und Raumfahrt e.V.	Silica gebundene Kernwerkstoffe, Verfahren zu deren Herstellung und deren Verwendung
DE102004042535B4 (de)	2004-09-02	2019-05-29	Ask Chemicals Gmbh	Formstoffmischung zur Herstellung von Gießformen für die Metallverarbeitung, Verfahren und Verwendung
DE102006003198A1 (de) *	2006-01-24	2007-07-26	Deutsches Zentrum für Luft- und Raumfahrt e.V.	Kerne für den Leichtmetall- und/oder den Feinguss
DE202007019192U1 (de)	2006-10-19	2011-02-03	Ashland-Südchemie-Kernfest GmbH	Kohlenhydrathaltige Formstoffmischung
DE102006049379A1 (de)	2006-10-19	2008-04-24	Ashland-Südchemie-Kernfest GmbH	Phosphorhaltige Formstoffmischung zur Herstellung von Giessformen für die Metallverarbeitung
DE102006061876A1 (de)	2006-12-28	2008-07-03	Ashland-Südchemie-Kernfest GmbH	Kohlenhydrathaltige Formstoffmischung
DE102008041217A1 (de) *	2008-08-13	2010-02-18	Volkswagen Ag	Formstoffbinder für schüttbare Formmassen und Verfahren zum Herstellen von Kerneinsätzen für Gussformen
EP2537926A1 (en)	2011-06-21	2012-12-26	Isobionics B.V.	Valencene synthase
DE102015106126A1 (de)	2015-04-21	2016-10-27	Nemak, S.A.B. De C.V.	Kernkasten zum Herstellen von Gießkernen
RU2763701C1 (ru) *	2021-06-22	2021-12-30	федеральное государственное бюджетное образовательное учреждение высшего образования "Нижегородский государственный технический университет им. Р.Е. Алексеева" (НГТУ)	Способ изготовления литейных стержней и форм

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
GB952788A (en) *	1962-02-15	1964-03-18	Foseco Int	Moulds, cores and the like suitable for foundry and like purposes
US4226277A (en) *	1978-06-29	1980-10-07	Ralph Matalon	Novel method of making foundry molds and adhesively bonded composites
WO1986000032A1 (en) *	1984-06-12	1986-01-03	MIKROVA^oGSAPPLIKATION AB	A core box and method of manufacturing the same
JPS6167539A (ja) *	1984-09-12	1986-04-07	Mitsubishi Heavy Ind Ltd	塗型材の乾燥方法
WO1989005204A1 (en) *	1987-12-08	1989-06-15	Harri Sahari	Method for preparation of moulds and cores used in the casting of metals
JPH01215433A (ja) *	1988-02-19	1989-08-29	Mitsubishi Motors Corp	高圧鋳造用中子の製造方法
US4960162A (en) *	1989-02-17	1990-10-02	Esco Corporation	Method of reclaiming foundry sand

1996
- 1996-08-09 DE DE19632293A patent/DE19632293C2/de not_active Expired - Lifetime
1997
- 1997-07-26 AT AT97934549T patent/ATE197683T1/de active
- 1997-07-26 DK DK97934549T patent/DK0917499T3/da active
- 1997-07-26 ES ES97934549T patent/ES2153677T3/es not_active Expired - Lifetime
- 1997-07-26 EP EP97934549A patent/EP0917499B1/de not_active Expired - Lifetime
- 1997-07-26 DE DE59702665T patent/DE59702665D1/de not_active Expired - Lifetime
- 1997-07-26 HU HU0001766A patent/HU222658B1/hu not_active IP Right Cessation
- 1997-07-26 WO PCT/EP1997/004072 patent/WO1998006522A2/de not_active Ceased

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE10144193C1 (de) *	2001-09-08	2002-10-31	Vaw Mandl & Berger Gmbh Linz	Verfahren und Formschießmaschine zum Herstellen von Formteilen, wie Gießkernen, für Gießformen zum Vergießen von Metallschmelze
DE10144391C1 (de) *	2001-09-10	2002-10-17	Vaw Mandl & Berger Gmbh Linz	Verfahren und Formschießmaschine zum Herstellen von Formteilen, wie Gießkernen, für Gießformen zum Vergießen von Metallschmelze
DE10209183A1 (de) *	2002-03-04	2003-10-02	Vaw Mandl & Berger Gmbh Linz	Formstoff für die Herstellung von Gießformteilen
DE10209224A1 (de) *	2002-03-04	2003-10-09	Vaw Mandl & Berger Gmbh Linz	Verfahren zum Herstellen von Gußstücken
US10232430B2 (en)	2007-10-30	2019-03-19	Ask Chemicals Gmbh	Mould material mixture having improved flowability
WO2010025861A1 (de) *	2008-09-05	2010-03-11	Minelco Gmbh	Mit wasserglas beschichteter und/oder vermischter kern- oder formsand mit einem wassergehalt im bereich von≥etwa 0,25 gew.-% bis etwa 0,9 gew.-%
EP2163328A1 (de) *	2008-09-05	2010-03-17	Minelco GmbH	Mit Wasserglas beschichteter und/oder vermischter Kern- oder Formsand mit einem Wassergehalt im Bereich von >= etwa 0,25 Gew.-% bis etwa 0,9 Gew.-%

Also Published As

Publication number	Publication date
WO1998006522A2 (de)	1998-02-19
HUP0001766A3 (en)	2000-11-28
DE19632293A1 (de)	1998-02-19
HU222658B1 (hu)	2003-09-29
DE19632293C2 (de)	1999-06-10
ES2153677T3 (es)	2001-03-01
WO1998006522A3 (de)	1998-06-04
EP0917499A2 (de)	1999-05-26
HUP0001766A2 (hu)	2000-09-28
ATE197683T1 (de)	2000-12-15
DE59702665D1 (de)	2000-12-28
DK0917499T3 (da)	2001-02-12

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