EP1513632B1 - Verfahren zur herstellung eines giesskerns oder einer giessform - Google Patents

Verfahren zur herstellung eines giesskerns oder einer giessform Download PDF

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Publication number
EP1513632B1
EP1513632B1 EP03718779A EP03718779A EP1513632B1 EP 1513632 B1 EP1513632 B1 EP 1513632B1 EP 03718779 A EP03718779 A EP 03718779A EP 03718779 A EP03718779 A EP 03718779A EP 1513632 B1 EP1513632 B1 EP 1513632B1
Authority
EP
European Patent Office
Prior art keywords
binder
process according
added
mould
pore
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.)
Expired - Lifetime
Application number
EP03718779A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1513632A1 (de
Inventor
Alexander Schrey
Gotthard Wolf
Rolf Rietzscher
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.)
Georg Fischer AG
Original Assignee
Georg Fischer 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.)
Filing date
Publication date
Application filed by Georg Fischer AG filed Critical Georg Fischer AG
Priority to SI200330536T priority Critical patent/SI1513632T1/sl
Publication of EP1513632A1 publication Critical patent/EP1513632A1/de
Application granted granted Critical
Publication of EP1513632B1 publication Critical patent/EP1513632B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 a process for the production of casting cores or molds for casting molds from a molding base material and a binder and casting cores or molds after production of the process.
  • Cast cores have the task of forming cavities in the casting or undercut outer contours.
  • This type of Giesskernen be prepared in known manner in core boxes by means of core shooting equipment, wherein the molding sand provided with binder and optionally with additives is introduced by means of compressed air into the cavities of the core molding boxes.
  • binders liquid synthetic resins or inorganic binders are generally used.
  • the invention relates to all organic and inorganic molding and core production processes, preferably to the urethane cold box process and / or the resol CO 2 process. Also conceivable are physical methods, for example ultrasonic methods.
  • the core production after the urethane cold box takes place in cold core boxes using organic binder systems, which are gas-hardened directly in the core box, for example by tertiary amines.
  • the solidification of the molding material mixture eg quartz sand, organic bonding system, hardener
  • the mixing of the individual components takes place beforehand in special facilities.
  • One advantage of this urethane cold box process is, among others, the achievement of high strengths of the cores or molds.
  • the finished cores can be coated by means of a sizing.
  • a sizing are refractory materials in powdery, liquid or pasty form for the production of a thin coating on the Giesskernen.
  • the sizing has several tasks. Among others, the sizing is for thermal insulation, smoothing, preventing sticking of metal to the mold wall, blade rib formation, and thus ensuring a secure separation of the casting from the mold wall when the mold is emptied.
  • the casting cores are removed from the casting.
  • the Giesskerne are removed, for example, by blasting, vibration, blowing, knocking or washing.
  • DE 195 49 469 A1 describes a Giesskern for casting from using a water-soluble binder based on polyphosphates solidified molding sand, wherein the binder is instantiated sodium polyphosphate and that a mixing ratio of 3 to 7 parts by weight of binder and 0.5 to 2 parts by weight of water per 100 Parts by weight of molding sand is given.
  • the binder mixture for core sand production consists of a single component (single resin) or a mixture of one or more individual components (resin mixture) with additives.
  • the invention has for its object to provide a Giesskern or a form of the type mentioned, which have a pore structure while avoiding the aforementioned disadvantages.
  • the use of a size should no longer be necessary.
  • the disadvantageous leaf rib formation in the casting process should be avoided.
  • this object is achieved in that a pore-forming substance is added to the molding material and / or the binder.
  • Nuclei produced by the known resol-carbon dioxide process show a typical pore structure in scanning electron microscopic investigations. It has been proven that this pore structure the o.g. Expansion error ("leaf ribs") prevented.
  • Pore-forming substances give off their decomposition by acid generator or heat, for example, from carbon dioxide, which produces the desired fine-pored structure in the molding material mixture.
  • acid generator or heat for example, from carbon dioxide
  • the application of physical methods e.g. Ultrasound procedure, contribute.
  • the pore-forming substance is not limited to the formation of carbon dioxide. It is any pore-forming additive conceivable that produces the desired pores in Giesskern or the mold, for example, nitrogen-producing substances would be conceivable.
  • pore-forming substances that generate carbon dioxide, such as.
  • ammonium carbonate ammonium bicarbonate, sodium carbonate and / or sodium bicarbonate. It has been shown that sodium bicarbonate proves to be particularly suitable.
  • an acidifying agent is added to the carbon dioxide-forming substance and / or heat is supplied.
  • the carbon dioxide is released in particular by an acidic environment or by energy supply in the form of heat.
  • an acidulant is added to the carbon dioxide-forming substance, for example, tartar.
  • the binder is composed in the ratio 1: 1 of a phenolic resin and an isocyanate component, wherein both binder components are added simultaneously or successively in the molding material and then mixed.
  • the pore-forming substance can be added simultaneously or subsequently with the binder of the core molding material mixture.
  • the carbon dioxide-forming substance is added together with a component of the binder.
  • the main technical advantages are a simplified, less expensive casting compared to the prior art. Because the sizing treatment is eliminated by the fine-pored pore structure and the appropriate strength of Giesskerne.
  • the weight proportions of resin and isocyanate can be between 0.5 and 1, depending on the desired strength of the Giesskerne. In general, resin and isocyanate are used in equal amounts, i. H. in the ratio 1: 1 added.
  • the pore-forming substance is usually added in the amount of 0.5 to 1 parts by weight.
  • an acid generator for example, tartar
  • 0.2 to 0.7 parts by weight of an acid generator for example, tartar
  • an acid generator for example, tartar
  • the single figure shows the pore-shaped structure of a Giesskernmaterials, wherein the average pore size is 100 nm to 500 nm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • General Preparation And Processing Of Foods (AREA)
  • Unwinding Webs (AREA)
  • Saccharide Compounds (AREA)
  • Materials For Medical Uses (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP03718779A 2002-06-19 2003-04-19 Verfahren zur herstellung eines giesskerns oder einer giessform Expired - Lifetime EP1513632B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200330536T SI1513632T1 (sl) 2002-06-19 2003-04-19 Postopek za pripravo livarskega jedra ali livarske forme

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10227512A DE10227512B4 (de) 2002-06-19 2002-06-19 Verfahren zur Herstellung von Giesskernen oder Formen, sowie nach diesem Verfahren hergestellte Giesskerne oder Formen
DE10227512 2002-06-19
PCT/EP2003/004107 WO2004000484A1 (de) 2002-06-19 2003-04-19 Giesskernmasse

Publications (2)

Publication Number Publication Date
EP1513632A1 EP1513632A1 (de) 2005-03-16
EP1513632B1 true EP1513632B1 (de) 2006-09-06

Family

ID=29723308

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03718779A Expired - Lifetime EP1513632B1 (de) 2002-06-19 2003-04-19 Verfahren zur herstellung eines giesskerns oder einer giessform

Country Status (16)

Country Link
US (1) US7645814B2 (ja)
EP (1) EP1513632B1 (ja)
JP (1) JP4397040B2 (ja)
CN (1) CN1305599C (ja)
AT (1) ATE338598T1 (ja)
AU (1) AU2003222830B2 (ja)
BR (1) BR0308414B1 (ja)
CA (1) CA2484263C (ja)
DE (2) DE10227512B4 (ja)
DK (1) DK1513632T3 (ja)
ES (1) ES2268348T3 (ja)
MX (1) MXPA04009502A (ja)
PT (1) PT1513632E (ja)
RU (1) RU2309813C2 (ja)
WO (1) WO2004000484A1 (ja)
ZA (1) ZA200409842B (ja)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE502005004015D1 (de) * 2005-08-13 2008-06-19 Fischer Georg Automobilguss Verfahren zur Herstellung von Giesskernnen oder Formen
US20110139309A1 (en) * 2009-12-16 2011-06-16 Showman Ralph E Foundry mixes contaiing carbonate salts and their uses
CN106077498A (zh) * 2016-08-15 2016-11-09 合肥江淮铸造有限责任公司 一种柴油机缸体的制芯工艺
CN114130944A (zh) * 2021-12-07 2022-03-04 青岛连山铸造有限公司 一种使用新型材料的铸造箱体

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5858955A (ja) * 1981-10-05 1983-04-07 Hiroshi Kawauchi 鋳型の通気性の改善法
JPS5870939A (ja) * 1981-10-26 1983-04-27 Sumitomo Deyurezu Kk シエルモ−ルド用レジンコ−テツドサンドとその製造法
JPS60180643A (ja) * 1984-02-29 1985-09-14 Nissan Motor Co Ltd 鋳物砂用粘結剤に用いる崩壊助剤
US4852629A (en) * 1986-08-25 1989-08-01 Ashland Oil, Inc. Cold-box process for forming foundry shapes which utilizes certain carboxylic acids as bench life extenders
DE4002440A1 (de) * 1989-01-31 1990-08-02 Ube Industries Zusammengesetzte keramikgiessform und verfahren zu ihrer herstellung
US5911269A (en) * 1992-11-16 1999-06-15 Industrial Gypsum Co., Inc. Method of making silica sand molds and cores for metal founding
GB9226815D0 (en) * 1992-12-23 1993-02-17 Borden Uk Ltd Improvements in or relating to water dispersible moulds
DE4331697A1 (de) 1993-09-17 1995-03-23 Sued Chemie Ag Bindemittel für Gießereiformsand
DE19549469C2 (de) * 1995-07-12 1999-05-12 Eichenauer Gmbh & Co Kg F Gießkern zum Gießformen und Verfahren zum Herstellen eines solchen Gießkerns
DE19525307C2 (de) * 1995-07-12 2003-04-03 Eichenauer Gmbh & Co Kg F Formmasse zur Herstellung von Gießkernen und Verfahren zur Herstellung eines Gießkerns
US6013125A (en) * 1995-09-13 2000-01-11 Quraishi; Mashallah M. Investment of powders and method for rapid preparation of investment molds
US5733952A (en) * 1995-10-18 1998-03-31 Borden Chemical, Inc. Foundry binder of phenolic resole resin, polyisocyanate and epoxy resin
EP0891954B1 (en) 1996-12-27 2004-04-14 Iberia Ashland Chemical, S.A. Molding sand appropriate for the fabrication of cores and molds
ZA995240B (en) * 1998-09-02 2000-02-21 Ashland Inc Amine cured foundry binder systems and their uses.
DE19939062A1 (de) * 1999-08-18 2001-02-22 Deutsch Zentr Luft & Raumfahrt Verwendung von Kunststoff/Kohlenstoff-Aerogelen als Kernwerkstoff
CN1298775A (zh) * 1999-12-08 2001-06-13 芦华居 机械铸造沙芯组合胶粘剂
US6365646B1 (en) * 1999-12-08 2002-04-02 Borden Chemical, Inc. Method to improve humidity resistance of phenolic urethane foundry binders

Also Published As

Publication number Publication date
US7645814B2 (en) 2010-01-12
ES2268348T3 (es) 2007-03-16
ATE338598T1 (de) 2006-09-15
DK1513632T3 (da) 2007-01-08
JP2005533656A (ja) 2005-11-10
AU2003222830A1 (en) 2004-01-06
US20050176845A1 (en) 2005-08-11
AU2003222830B2 (en) 2008-10-09
BR0308414B1 (pt) 2011-06-28
WO2004000484A1 (de) 2003-12-31
RU2309813C2 (ru) 2007-11-10
JP4397040B2 (ja) 2010-01-13
CN1662319A (zh) 2005-08-31
PT1513632E (pt) 2007-01-31
DE50304963D1 (de) 2006-10-19
CA2484263A1 (en) 2003-12-31
ZA200409842B (en) 2005-07-18
DE10227512A1 (de) 2004-01-15
CA2484263C (en) 2010-07-13
CN1305599C (zh) 2007-03-21
MXPA04009502A (es) 2005-12-12
RU2005101334A (ru) 2005-07-20
EP1513632A1 (de) 2005-03-16
DE10227512B4 (de) 2004-07-08
BR0308414A (pt) 2005-01-18

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