EP0917499A2 - Verfahren zur herstellung von kernformlingen und umlaufkernsand für giessereizwecke - Google Patents
Verfahren zur herstellung von kernformlingen und umlaufkernsand für giessereizweckeInfo
- Publication number
- EP0917499A2 EP0917499A2 EP97934549A EP97934549A EP0917499A2 EP 0917499 A2 EP0917499 A2 EP 0917499A2 EP 97934549 A EP97934549 A EP 97934549A EP 97934549 A EP97934549 A EP 97934549A EP 0917499 A2 EP0917499 A2 EP 0917499A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- core
- sand
- binder
- core box
- mixture
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 37
- 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
- 239000011230 binding agent Substances 0.000 claims abstract description 32
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000012778 molding material Substances 0.000 claims description 29
- 238000000465 moulding Methods 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000003110 molding sand Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 2
- 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
- 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
- 239000000155 melt Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 2
- 238000000053 physical method Methods 0.000 abstract 1
- 238000003860 storage Methods 0.000 description 33
- 239000000047 product Substances 0.000 description 14
- 238000005452 bending Methods 0.000 description 12
- UEEJHVSXFDXPFK-UHFFFAOYSA-N N-dimethylaminoethanol Chemical compound CN(C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-N 0.000 description 7
- 239000012972 dimethylethanolamine Substances 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- 238000007906 compression Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000004593 Epoxy Substances 0.000 description 3
- 239000004115 Sodium Silicate Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 239000000463 material 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
- 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
- 239000011521 glass Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000011368 organic material Substances 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
- 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
- 239000000470 constituent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- -1 ester compounds Chemical class 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000004848 polyfunctional curative Substances 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
- 239000004575 stone Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000002699 waste material Substances 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
- B22C1/16—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 process for the production of core moldings for foundry technology, a mixture of an inorganic, refractory molding sand and an inorganic binder based on water glass being produced, the mixture being poured into a temperature-controlled core box, the water contained in the mixture being removed physically and the core preform is removed from the core box and a process for producing circulating core sand.
- test samples consisted of a compressed sand-sodium silicate mixture.
- a vacuum in the range of 0.5 to 3 mm Hg was applied to dry the test samples and held until 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" by "usual" C0 2 gassing systems.
- ester compounds are not recommended because of the environmental problems mentioned above.
- Fig. 3.28 shows on page 83 the course of the secondary strength for C0 2 tempered water glass molding materials depending on the casting temperature.
- This process which has developed into the standard process for conventional and modified binder solutions in the past 30 years, leads to water glass-bonded molding materials with the high-temperature behavior shown in Fig.3.28, which is characterized by an increased tendency to sinter and by an inadequate disintegration ability of the molding material after casting .
- melting phases occur, which form new bonds with the basic molding material during the subsequent cooling.
- a reduction in the secondary strength achieved can be achieved by the following measures according to "Manual" on page 84:
- Fig. 7 Comparison of gas volume formation with sand, AWB and CB products.
- FIG. 1 contains a comparison of the representation of different molding material binder systems under constantly defined conditions.
- the mold storage time is designated 0 minutes, i. H. the molding material is processed to form immediately after mixing.
- the core storage time is 60 minutes, i. H. the shaping is stored for the specified time after the shaping 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 H 2.5 core shooter.
- the tool temperature was 150 ° C.
- the compression was carried out at 2.5 bar overpressure and a residence time in the tool of 8 seconds, the gases produced being sucked off at a flow rate of 4 m 3 / h before the tool was opened.
- the core molding was placed in the Microwave (600 watts) dried 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 with the Resol-C0 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 "C0 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
- S0 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.
- FIG. 5 the illustration according to FIG. 4 is supplemented by different molding material storage times. Neither figure shows the comparison of regenerates with different core storage times because the comparison methods only allow the molded articles to be stable after the organic constituents have been removed.
- the comparison of the bending strength of the core molding according to the invention shown in FIG. 5 with different core storage times shows that the increase in strength is less clear in the product according to the invention than in the comparison products.
- FIG. 2 shows the curve of the bending strength as a function of the molding material storage time (FLZ) and the core storage time (KLZ).
- FLZ molding material storage time
- KLZ core storage time
- Figure 3 contains a representation of the bending strength depending on the molding material storage time (FLZ) and the core storage time (KLZ) of the AWB process. 2.5% binder
- Compression combines 2.5 bar overpressure and -0.6 bar underpressure
- FIG. 5 shows the bending strength as a function of the core storage time (KLZ) in comparison to other molding material systems. 2.5% binder AWB process
- the mold storage time is designated 0 minutes, i. H. the molding material is processed to form immediately after mixing.
- the core storage time is designated 0 minutes, i. H. the shaping is broken immediately after shaping.
- FIG. 7 shows the comparison of the gas volume formation of cold box and AWB moldings under thermal stress.
- System parameters oven temperature 770 ° C molding material weight 2g
- 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.
- AWB 2.5% stone houses / water extraction-hardening water glass binder
- the samples were stored under common room conditions for 24 hours before the experiment.
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)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19632293 | 1996-08-09 | ||
DE19632293A DE19632293C2 (de) | 1996-08-09 | 1996-08-09 | Verfahren zur Herstellung von Kernformlingen für die Gießereitechnik |
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 true EP0917499A2 (de) | 1999-05-26 |
EP0917499B1 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 (de) |
AT (1) | ATE197683T1 (de) |
DE (2) | DE19632293C2 (de) |
DK (1) | DK0917499T3 (de) |
ES (1) | ES2153677T3 (de) |
HU (1) | HU222658B1 (de) |
WO (1) | WO1998006522A2 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003024642A1 (de) * | 2001-09-14 | 2003-03-27 | Hydro Aluminium Deutschland Gmbh | Verfahren zum herstellen von gussstücken, formsand und seine verwendung für die durchführung des verfahrens |
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.-% |
EP2537926A1 (de) | 2011-06-21 | 2012-12-26 | Isobionics B.V. | Valencensynthase |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE29925011U1 (de) * | 1999-10-26 | 2008-10-02 | Minelco Gmbh | Giessereikern-Bindemittelsystem |
EA005362B1 (ru) * | 2001-08-10 | 2005-02-24 | Дипл.-Инж. Лемпе Гмбх | Способ и устройство для изготовления литейных форм или стержней для целей литейного производства |
DE10200927A1 (de) * | 2001-08-10 | 2003-03-06 | Laempe Joachim | Verfahren und Vorrichtung zur Herstellung von Formen oder Kernen für Giessereizwecke |
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 |
DE10209224A1 (de) * | 2002-03-04 | 2003-10-09 | Vaw Mandl & Berger Gmbh Linz | Verfahren zum Herstellen von Gußstücken |
DE10209183A1 (de) * | 2002-03-04 | 2003-10-02 | Vaw Mandl & Berger Gmbh Linz | Formstoff für die Herstellung von Gießformteilen |
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 |
DE102006061876A1 (de) | 2006-12-28 | 2008-07-03 | Ashland-Südchemie-Kernfest GmbH | Kohlenhydrathaltige Formstoffmischung |
EP2104580B2 (de) | 2006-10-19 | 2022-02-23 | ASK Chemicals GmbH | Kohlenhydrathaltige formstoffmischung mit ein anteil eines teilchenförmigen metalloxids zum auf wasserglas basierendem bindemittel zugesetz |
DE102006049379A1 (de) | 2006-10-19 | 2008-04-24 | Ashland-Südchemie-Kernfest GmbH | Phosphorhaltige Formstoffmischung zur Herstellung von Giessformen für die Metallverarbeitung |
DE102007051850A1 (de) | 2007-10-30 | 2009-05-07 | Ashland-Südchemie-Kernfest GmbH | Formstoffmischung mit verbesserter Fliessfähigkeit |
DE102008041217A1 (de) * | 2008-08-13 | 2010-02-18 | Volkswagen Ag | Formstoffbinder für schüttbare Formmassen und Verfahren zum Herstellen von Kerneinsätzen für Gussformen |
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)
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 |
EP0214987A1 (de) * | 1984-06-12 | 1987-03-25 | Mikrovagsapplikation Ab | Kerndose und deren herstellung |
JPS6167539A (ja) * | 1984-09-12 | 1986-04-07 | Mitsubishi Heavy Ind Ltd | 塗型材の乾燥方法 |
US5158130A (en) * | 1987-12-08 | 1992-10-27 | 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 EP EP97934549A patent/EP0917499B1/de not_active Expired - Lifetime
- 1997-07-26 WO PCT/EP1997/004072 patent/WO1998006522A2/de active IP Right Grant
- 1997-07-26 ES ES97934549T patent/ES2153677T3/es not_active Expired - Lifetime
- 1997-07-26 HU HU0001766A patent/HU222658B1/hu not_active IP Right Cessation
- 1997-07-26 DK DK97934549T patent/DK0917499T3/da active
- 1997-07-26 DE DE59702665T patent/DE59702665D1/de not_active Expired - Lifetime
- 1997-07-26 AT AT97934549T patent/ATE197683T1/de active
Non-Patent Citations (1)
Title |
---|
See references of WO9806522A2 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003024642A1 (de) * | 2001-09-14 | 2003-03-27 | Hydro Aluminium Deutschland Gmbh | Verfahren zum herstellen von gussstücken, formsand und seine verwendung für die durchführung des verfahrens |
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.-% |
US8627877B2 (en) | 2008-09-05 | 2014-01-14 | Minelco Gmbh | Core or foundry sand coated and/or mixed with water glass with a water content in the range of ≧ approximately 0.25% by weight to approximately 0.9% by weight |
EP2537926A1 (de) | 2011-06-21 | 2012-12-26 | Isobionics B.V. | Valencensynthase |
Also Published As
Publication number | Publication date |
---|---|
EP0917499B1 (de) | 2000-11-22 |
DE59702665D1 (de) | 2000-12-28 |
DE19632293A1 (de) | 1998-02-19 |
WO1998006522A3 (de) | 1998-06-04 |
ATE197683T1 (de) | 2000-12-15 |
DE19632293C2 (de) | 1999-06-10 |
HUP0001766A3 (en) | 2000-11-28 |
DK0917499T3 (da) | 2001-02-12 |
HU222658B1 (hu) | 2003-09-29 |
WO1998006522A2 (de) | 1998-02-19 |
ES2153677T3 (es) | 2001-03-01 |
HUP0001766A2 (hu) | 2000-09-28 |
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