EP0366598B1 - Noyau de cassage pour masselottes - Google Patents

Noyau de cassage pour masselottes Download PDF

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Publication number
EP0366598B1
EP0366598B1 EP89730211A EP89730211A EP0366598B1 EP 0366598 B1 EP0366598 B1 EP 0366598B1 EP 89730211 A EP89730211 A EP 89730211A EP 89730211 A EP89730211 A EP 89730211A EP 0366598 B1 EP0366598 B1 EP 0366598B1
Authority
EP
European Patent Office
Prior art keywords
casting
breaker core
crushing
core
feeder
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
EP89730211A
Other languages
German (de)
English (en)
Other versions
EP0366598A3 (fr
EP0366598A2 (fr
Inventor
Hubert Finkelmeier
Michael Dr. Ing. Gloz
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.)
Chemex GmbH
Original Assignee
Chemex 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 Chemex GmbH filed Critical Chemex GmbH
Publication of EP0366598A2 publication Critical patent/EP0366598A2/fr
Publication of EP0366598A3 publication Critical patent/EP0366598A3/fr
Application granted granted Critical
Publication of EP0366598B1 publication Critical patent/EP0366598B1/fr
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
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/084—Breaker cores

Definitions

  • casting molds must be provided with one or more feeders in order to compensate for volume deficits which occur when the casting solidifies and thus to prevent voids forming in the casting.
  • the feeders remain connected to the casting and must then be separated. Then the surface of the casting must also be smoothed and deburred.
  • the effort involved can be reduced if a crushing core is arranged between the feeder and the mold cavity, which is essentially disc-shaped and has a smaller flow opening than the feeder cross section.
  • the connecting web remaining between the feeder and the casting after the casting has solidified becomes smaller, and thus the removal of the feeder is easier.
  • the feeder then only needs to be knocked off and no longer has to be cut off by sawing, milling, burning or the like methods. Accordingly, the effort for deburring and smoothing the casting surface is reduced.
  • crushing cores for example DE-U-8 710791
  • binders for example from quartz, zircon or chromite sands, which are bound with oils, starch binders, water glass or phenolic resins.
  • the aim is to have the smallest possible crushing cores with the smallest possible flow opening. So far, however, this requirement has not been met not satisfactorily. Because of their low strength at casting temperatures in connection with the strong suction of the material fed through the passage opening into the casting, these crushing cores can namely be bent or even break towards the casting, with the result that depressions result in the casting, which are either subsequently replenished (eg welded on) or lead to the rejection of the casting. This applies in particular to the casting of iron materials and to crushing cores with larger diameters.
  • the invention solves this problem in that the crusher core is provided in addition to its flow opening with further small openings which have no feeding function.
  • the openings provided according to the invention achieve a very excellent stabilization of the crushing cores.
  • this effect of the openings is due to the fact that the material initially rising in the riser during the casting solidifies very quickly in the small openings and thereby forms metallic webs which increase the strength of the crushing core so much that it increases the strength that occurs during the subsequent feeding process Can withstand forces without or at least without significant deformation.
  • These openings should not contribute to feeding the casting and therefore their diameter is limited at the top. In practice, these are mostly openings with a diameter of approximately 2-5 mm and preferably approximately 3-4 mm.
  • the separation effect of the crusher core is not affected by the additional webs that form through these small openings. This enables the advantages of the crusher core to be optimally used.
  • FIG. 1 and 2 illustrate the principle of the invention using the example of a circularly symmetrical crusher core 1 with a central flow opening 2.
  • Several small openings 3 are arranged symmetrically around the flow opening 2, which form the “openings without feeding function” provided according to the invention.
  • These openings can have the shape of cylindrical through openings (FIG. 2A) or be chamfered on their outer edges (FIG. 2B).
  • FIGS. 3 and 4 A preferred embodiment of the invention is shown in FIGS. 3 and 4.
  • the small openings 3' arranged around the central flow opening 2 ' are slightly conical.
  • their mouth regions are connected to one another on one or on both sides of the crushing core by groove-like ring channels 4 and 5.
  • the stabilizing effect of the metallic webs forming in the openings 3 ' is additionally improved.
  • the number of openings 3 and 3 ' depends on the diameter of the crushing core.
  • the following values have proven to be very suitable for crushing cores of approximately 10 mm thick made of synthetic resin-bonded sand in the embodiment according to FIGS. 3 and 4, which were provided with openings 3 'with an average diameter of 3.5 mm:
  • the invention is not limited to symmetrical crushing cores, but can be used with all types of crushing cores, regardless of the shape and placement of the passage opening 2.
  • the invention is also independent of whether the crushing core is combined with exothermic and / or insulating materials in the feeder area (for example feeder casings ) is used.
  • the number, size and position of the small openings 3 and 3 ' can easily be determined for each application by a preliminary test.
  • the small openings 3 and 3 ' can also be formed in the manufacture of the crushing core (e.g. in the shooting process), but they can also be made subsequently (e.g. by drilling).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Crushing And Grinding (AREA)

Claims (5)

  1. Noyau de cassage pour masselottes, comprenant un produit de fonderie en grains liés par un liant, caractérisé en ce que le noyau de cassage (1, 1') présente, en plus de son ouverture de passage (2, 2'), une pluralité d'autres petites ouvertures (3, 3') qui n'ont pas de fonction de masselotte.
  2. Noyau de cassage suivant la revendication 1, caractérisé en ce que les autres petites ouvertures (3. 3') sont symétriques autour de l'ouverture de passage (2, 2').
  3. Noyau de cassage suivant la revendication 1 ou 2, caractérisé en ce que les autres petites ouvertures (3, 3') présentent un diamètre de 2 à 5 mm et, de préférence, de 3 à 4 mm.
  4. Noyau de cassage suivant la revendication 1, ou 2, ou 3, caractérisé en ce que les autres petites ouvertures (3') sont de forme conique.
  5. Noyau de cassage suivant la revendication 1, ou 2, ou 3, ou 4, caractérisé en ce que les zones où débouchent les autres petites ouvertures (3') sur, au moins, un côté du noyau de cassage (1') sont reliées ensemble par un canal circulaire (4, 5) en forme de rainure.
EP89730211A 1988-10-27 1989-10-27 Noyau de cassage pour masselottes Expired - Lifetime EP0366598B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3836623A DE3836623A1 (de) 1988-10-27 1988-10-27 Brechkern fuer speiser
DE3836623 1988-10-27

Publications (3)

Publication Number Publication Date
EP0366598A2 EP0366598A2 (fr) 1990-05-02
EP0366598A3 EP0366598A3 (fr) 1991-11-21
EP0366598B1 true EP0366598B1 (fr) 1993-05-12

Family

ID=6366042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89730211A Expired - Lifetime EP0366598B1 (fr) 1988-10-27 1989-10-27 Noyau de cassage pour masselottes

Country Status (2)

Country Link
EP (1) EP0366598B1 (fr)
DE (2) DE3836623A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2515903B2 (ja) * 1990-03-02 1996-07-10 株式会社日立製作所 交流電動機駆動システムとその制御方法
DE19508119A1 (de) * 1995-03-08 1996-09-12 Bayer Ag Sulfonylaminocarbonyltriazolinone mit Halogenalkylthio-Substituenten
RU2192330C2 (ru) * 2000-12-04 2002-11-10 Государственное унитарное предприятие Производственное объединение "Уралвагонзавод" им. Ф.Э.Дзержинского Легкоотделяемая прибыль литниковой системы и способ ее отделения
CN103159575B (zh) * 2013-03-20 2015-06-17 中国工程物理研究院化工材料研究所 工艺盖及其使用方法
CN103192029B (zh) * 2013-03-26 2015-08-05 山东宏马工程机械有限公司 制动鼓铸造工艺用环形芯子、制芯设备及其制芯工艺
CN103551511B (zh) * 2013-11-14 2015-07-29 沈阳工业大学 储液式冒口易割片

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1597832A (en) * 1977-03-01 1981-09-09 Foseco Trading Ag Breaker core assembly for use in the casting of molten metals
DE8710791U1 (de) * 1987-08-06 1988-02-11 A. Friedr. Flender AG, 4290 Bocholt Brechkern

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
GIESSEREI LEXIKON, 14. Auflage, E. Brunhuber, 1988, Fachverlag Schiele & Schön GmbH, Berlin, DE, "Einschnürkern", Seite 215 *

Also Published As

Publication number Publication date
EP0366598A3 (fr) 1991-11-21
EP0366598A2 (fr) 1990-05-02
DE3836623A1 (de) 1990-05-03
DE58904336D1 (de) 1993-06-17

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