EP0476348A2 - Moule en sable pour la fabrication de culasses de moteur en aluminium - Google Patents

Moule en sable pour la fabrication de culasses de moteur en aluminium Download PDF

Info

Publication number
EP0476348A2
EP0476348A2 EP91114125A EP91114125A EP0476348A2 EP 0476348 A2 EP0476348 A2 EP 0476348A2 EP 91114125 A EP91114125 A EP 91114125A EP 91114125 A EP91114125 A EP 91114125A EP 0476348 A2 EP0476348 A2 EP 0476348A2
Authority
EP
European Patent Office
Prior art keywords
sand mold
mold according
cavity
blind hole
sand
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Withdrawn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
EP91114125A
Other languages
German (de)
English (en)
Other versions
EP0476348A3 (en
Inventor
Hans Stegmaier
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.)
W& W Schenk & Cokg Leichtgusswerke Maulbronn GmbH
Original Assignee
W& W Schenk & Cokg Leichtgusswerke Maulbronn 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 W& W Schenk & Cokg Leichtgusswerke Maulbronn GmbH filed Critical W& W Schenk & Cokg Leichtgusswerke Maulbronn GmbH
Publication of EP0476348A2 publication Critical patent/EP0476348A2/fr
Publication of EP0476348A3 publication Critical patent/EP0476348A3/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates

Definitions

  • the invention relates to a sand mold for the production of cylinder heads made of aluminum according to the preamble of claim 1.
  • the invention has for its object to design a sand mold for the production of cylinder heads made of aluminum such that the reject rate is significantly reduced.
  • the object is achieved in that an open blind hole is provided as a riser, in which an exothermic material is embedded.
  • the sand mold according to the invention In addition, a significant energy saving is achieved by using the sand mold according to the invention.
  • the known sand casting mold with several risers open to the atmosphere about 8 kg of casting waste is produced.
  • the sand casting mold according to the invention only 5 to 6 kg of casting waste accumulate due to the riser now being designed as a blind hole, although several risers are provided at critical points of the casting mold. Since the cast waste from solidified aluminum has to be melted down again for further use, the sand casting mold according to the invention results in less energy expenditure for remelting the cast waste.
  • the cavities in the mold are filled in by pouring a liquid aluminum melt until the aluminum melt enters the blind holes and the exothermic material reacts.
  • the resulting heat lasts the aluminum melt is liquid, which enables directional solidification.
  • the gases that occur during the exothermic reaction enter the molding sand, so that the working environment remains free of gases and vapors.
  • the exothermic material is designed as an insertable, solid molding which has a material density of approximately 1.25 g / cm 3.
  • the molding lies approximately in register in the blind hole, whereby it stands on a base which is arranged in the sand casting mold in the end section of the blind hole facing the cavity.
  • the pedestal extends over a partial cross section of the cross-sectional area of the blind hole, so that a connection between the blind hole and the cavity of the sand mold is ensured.
  • the base overlaps the rising end of the molding.
  • the overlapping section of the base and the overlapped end of the molding preferably engage in one another conically.
  • the molded article has a central receiving opening for a preferably cylindrical retaining pin that widens slightly conically towards the base, the free end portion of which is overlapped radially approximately free of play by the molded article.
  • the molding is held radially securely at its two opposite end sections, so that slipping of the molding is largely excluded in the manufacture of the sand mold.
  • the sand mold 1 shown in the exemplary embodiment has a cavity 3 which, together with a model plate 2 carrying the sand mold 1, delimits a cavity 3.
  • a core package 4, in which the cast blank is formed, is arranged in the cavity 3.
  • the sand mold 1 is also surrounded by a molding box 22 which delimits the model plate 2 and corresponds in height to the height of the sand mold 1.
  • a pouring funnel 5 is provided for filling the aluminum melt.
  • the pouring funnel 5 is connected to the cavities to be filled in the core package 4 via channels, not shown.
  • blind holes 6 and 7 are arranged in the sand mold, which are open to the cavity 3.
  • the axes of the blind holes 6 and 7 are substantially perpendicular to the bottom 13 of the cavity 3.
  • the blind holes 6 and 7 are slightly conical, the larger cross-sectional area of each blind hole 6 and 7 facing the cavity 3.
  • each blind hole 6 and 7 an exothermic material is arranged, which is designed in the embodiment as a molding 8 or 9.
  • the material consists of a mixture of aluminum powder, flux and potassium nitrate. In foundry technology it is also referred to as "blow hole powder" and has an ignition temperature of around 350 ° C.
  • the molding pressed from the blow hole powder has a density of preferably about 1.25 g / cm3.
  • each molding 8 and 9 stands on a base 10 or 11 which lies in the end section of the blind hole 8 or 9 in the sand mold 1 facing the cavity 3.
  • the pedestal extends - as can be seen in particular from FIG. 2 - over a partial cross-section of the cross-sectional area of the blind hole 6 or 7, so that a connection of each blind hole 6 and 7 with the cavity 3 is maintained by the open partial areas of each pedestal 10 or 11 is.
  • the end face 12 of the base 10 and 11 facing the cavity 3 lies in one plane with the bottom 13 of the cavity 3.
  • Each pedestal overlaps the upstanding end 20 of the molding 8 and 9.
  • the overlapped end 20 of each molding 8 and 9 is tapered and lies in a corresponding conical receptacle of the overlapping section 21 of each pedestal 10 and 11.
  • Each pedestal 10 and 11 also has a central retaining pin which extends axially into the corresponding blind hole 6 or 7.
  • the holding pins 15 of the coasters 11 extend axially over a partial length of the blind hole 7, so that a distance remains between the free end of the holding pin 15 and the bottom of the blind hole 7.
  • the holding pin 16 of the base 10 is formed axially longer than the blind hole 6, so that the free end of the holding pin 16 dips into the bottom of the blind hole 6 and is embedded in the sand mold 1.
  • Each molding 8 or 9 has a central receiving opening 17 or 18 for the respective holding pin 15 or 16.
  • the receiving opening 17 or 18 widens slightly conically towards the respective base 10 or 11.
  • the receiving opening 18 of the molding 8 is designed as a continuous center hole, while the receiving opening 17 of the molding 9 is provided as a blind hole.
  • a vent opening 19 is preferably provided in the bottom of the blind hole forming the receiving opening 17.
  • each retaining pin 15 and 16 lies approximately free of play in the respective receiving opening 17 or 18, the retaining pin 16 projecting through the molding 8.
  • each molded piece 7 and 8 lies approximately in the corresponding blind hole 6 and 7, respectively.
  • the holding pins 15 and 16 are fixed in the upper part of the model plate, while at the same time securing the bases in their respective positions.
  • the sand mold 1 held in the molding box 22 and standing on the model plate 2, with its core package 4 arranged in the cavity 3, is filled with the aluminum melt via the casting funnel.
  • the cavities 30, 31, 32 and 33 shown schematically in FIG. 2 are filled via corresponding feed channels.
  • the liquid aluminum melt rises to the bottom 13 of the cavity 3 during the casting process and enters the blind holes 6 and 7 through the opening areas 37 (FIG. 2) of the pedestals 10 and 11.
  • the pedestals 11 have a smaller thickness (height) than the pedestal 10, so that the liquid aluminum melt first comes into contact with the moldings 7.
  • the temperature of the aluminum melt is 660 ° C., so that the exothermic material ignites when the aluminum melt comes into contact with the moldings 7, as a result of which heat is fed into the aluminum melt.
  • the molding 8 which is higher in relation to the base 13 is then ignited and burns off. It has been shown that risers designed as blind holes which are filled with an exothermic material lead to significantly better casting results than with risers open to the atmosphere.
  • the reject rate of the blanks produced with the sand casting mold according to the invention is very low, so that a sand casting mold for the production of cylinder heads made of aluminum can be used economically.
  • the amount of casting waste is lower. Since the casting waste has to be melted down again for a next casting process, the lower amount of casting waste also results in energy savings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP19910114125 1990-09-12 1991-08-23 Sand mold for fabricatung aluminium cylinder leads Withdrawn EP0476348A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4028868 1990-09-12
DE19904028868 DE4028868A1 (de) 1990-09-12 1990-09-12 Sandgussform zur herstellung von zylinderkoepfen aus aluminium

Publications (2)

Publication Number Publication Date
EP0476348A2 true EP0476348A2 (fr) 1992-03-25
EP0476348A3 EP0476348A3 (en) 1992-10-21

Family

ID=6414067

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910114125 Withdrawn EP0476348A3 (en) 1990-09-12 1991-08-23 Sand mold for fabricatung aluminium cylinder leads

Country Status (2)

Country Link
EP (1) EP0476348A3 (fr)
DE (1) DE4028868A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103433426A (zh) * 2013-08-23 2013-12-11 中核苏阀横店机械有限公司 支架支撑冒口套的铸件木模结构

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012019802B4 (de) 2012-10-10 2023-07-27 Mercedes-Benz Group AG Verfahren zur Herstellung eines Gusskörpers
CN104439086B (zh) * 2014-12-08 2016-08-24 哈尔滨理工大学 一种非轴对称复杂铸件砂型铸造过程中冒口的设计方法
CN105598379B (zh) * 2016-03-23 2017-07-14 哈尔滨理工大学 一种基于缩松缺陷预测的回转体薄壁铸件砂型铸造过程中冒口设计方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1021196A (fr) * 1950-06-30 1953-02-16 Gennevilliers Acieries Méthode de coulée et produit pour sa mise en oeuvre
FR1075994A (fr) * 1953-01-20 1954-10-21 Chemotechnik Anstalt Fu R Chem Composition empêchant la formation de retassures
DE2010337B1 (de) * 1970-03-05 1971-11-25 Rexroth Gmbh G L Exothermer Speiser für Gussstücke
DE3317631A1 (de) * 1983-05-14 1984-11-15 Gerhard Dipl.-Ing. 5070 Bergisch Gladbach Vitt Speiser zum dichtspeisen von gussstuecken
EP0134362A1 (fr) * 1983-09-05 1985-03-20 Aikoh Co. Ltd. Procédé pour maintenir la température du métal fondu dans une masselotte borgne pendant des opérations de coulée et produit permettant la mise en oeuvre du procédé
JPS63281765A (ja) * 1987-05-15 1988-11-18 Toyota Motor Corp アルミニウム合金鋳物のナトリウム元素添加方法
JPH01123035A (ja) * 1987-11-06 1989-05-16 Kobe Steel Ltd アルミニウムまたはアルミニウム合金溶湯用フラックスとそのフラックスを用いた除滓法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1021196A (fr) * 1950-06-30 1953-02-16 Gennevilliers Acieries Méthode de coulée et produit pour sa mise en oeuvre
FR1075994A (fr) * 1953-01-20 1954-10-21 Chemotechnik Anstalt Fu R Chem Composition empêchant la formation de retassures
DE2010337B1 (de) * 1970-03-05 1971-11-25 Rexroth Gmbh G L Exothermer Speiser für Gussstücke
DE3317631A1 (de) * 1983-05-14 1984-11-15 Gerhard Dipl.-Ing. 5070 Bergisch Gladbach Vitt Speiser zum dichtspeisen von gussstuecken
EP0134362A1 (fr) * 1983-09-05 1985-03-20 Aikoh Co. Ltd. Procédé pour maintenir la température du métal fondu dans une masselotte borgne pendant des opérations de coulée et produit permettant la mise en oeuvre du procédé
JPS63281765A (ja) * 1987-05-15 1988-11-18 Toyota Motor Corp アルミニウム合金鋳物のナトリウム元素添加方法
JPH01123035A (ja) * 1987-11-06 1989-05-16 Kobe Steel Ltd アルミニウムまたはアルミニウム合金溶湯用フラックスとそのフラックスを用いた除滓法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 13, no. 367 (C-626)(3715) 15. August 1989 & JP-A-1 123 035 ( KOBE STEEL LTD ) 16. Mai 1989 *
PATENT ABSTRACTS OF JAPAN vol. 13, no. 83 (M-802)(3431) 27. Februar 1989 & JP-A-63 281 765 ( TOYOTA MOTOR CORP ) 18. November 1988 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103433426A (zh) * 2013-08-23 2013-12-11 中核苏阀横店机械有限公司 支架支撑冒口套的铸件木模结构
CN103433426B (zh) * 2013-08-23 2015-06-24 中核苏阀横店机械有限公司 支架支撑冒口套的铸件木模结构

Also Published As

Publication number Publication date
EP0476348A3 (en) 1992-10-21
DE4028868A1 (de) 1992-03-19

Similar Documents

Publication Publication Date Title
DE2937452C2 (de) Verfahren zum Herstellen einer Schalenform mit verlorenem Modell zum Herstellen von Einkristall-Gußstücken
DE3902151A1 (de) Giessform zum metallgiessen und huelse hierfuer
DE3613191C2 (fr)
DE2833515C2 (de) Präzisionsgießform aus Keramik und Verfahren zu ihrer Herstellung
DE3924742A1 (de) Niederdruck-kokillen-giessverfahren zum giessen von metallgussteilen
EP0476348A2 (fr) Moule en sable pour la fabrication de culasses de moteur en aluminium
EP0933151B1 (fr) Moule pour la fabrication de pièces coulées
DE2939974C2 (fr)
DE60303012T2 (de) Vorrichtung und verfahren zur herstellung von gegenständen aus aluminiumlegierungen oder leichtmetalllegierungen
DE19621945C1 (de) Verfahren zum Schwerkraftgießen von Leichtmetall-Gußteilen im Kokillen-Gießverfahren
DE19652923C1 (de) Verfahren zur Herstellung von Gummibonbonwaren aus mindestens zwei unterschiedlichen Massen, insbesondere Fruchtgummibonbonmassen
DE2352175A1 (de) Verfahren und vorrichtung zur herstellung von mit kosmetika gefuellten behaeltern
DE1089126B (de) Verfahren und Vorrichtung zum Herstellen von Formen fuer Gussstuecke
DE2803247A1 (de) Kugelspeisermodell
DE2907301A1 (de) Geschlossener speiser fuer giessformen
EP0893182B1 (fr) Procédé pour la fabrication d'une chemise de cylindre d'un moteur à combustion interne
DE2743177C3 (de) Niederdruck-Gießeinrichtung für Gußstücke
DE2638100A1 (de) Verfahren und vorrichtung zum giessen von metall
DE3500809A1 (de) Verfahren und vorrichtung zur herstellung einer metallgiessform mit einer einverleibten speiserhuelse
AT142917B (de) Verfahren und Vorrichtung zur Herstellung von Hohlstangen oder anderen rohrförmigen oder hohlen Gußkörpern.
DE2926906A1 (de) Isolierspeiser-einsatzhuelse
AT398541B (de) Verfahren zum abgiessen von gussstücken
DE3244612C2 (de) Verfahren zur Herstellung von kugelförmigen Formgußsprengstoffstücken und Gießform zur Durchführung des Verfahrens
DE1089933B (de) Verfahren und Schablone zur Herstellung von Hauben
DE1806297C (de) Metallgießform für den waagerechten Guß von Stangen u. dgl

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT DE ES FR GB IT

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT DE ES FR GB IT

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19930114