EP2313219B1 - Einrichtung zum tragen von kernen - Google Patents

Einrichtung zum tragen von kernen Download PDF

Info

Publication number
EP2313219B1
EP2313219B1 EP09780067.6A EP09780067A EP2313219B1 EP 2313219 B1 EP2313219 B1 EP 2313219B1 EP 09780067 A EP09780067 A EP 09780067A EP 2313219 B1 EP2313219 B1 EP 2313219B1
Authority
EP
European Patent Office
Prior art keywords
core
holding tube
cylindrical portion
tube
reduced cylindrical
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.)
Not-in-force
Application number
EP09780067.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2313219A1 (de
Inventor
Dirk Thiemann
Gudrun Schiller
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.)
Emil Mueller GmbH
Original Assignee
Emil Mueller 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 Emil Mueller GmbH filed Critical Emil Mueller GmbH
Priority to PL09780067T priority Critical patent/PL2313219T3/pl
Publication of EP2313219A1 publication Critical patent/EP2313219A1/de
Application granted granted Critical
Publication of EP2313219B1 publication Critical patent/EP2313219B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C21/00—Flasks; Accessories therefor
    • B22C21/12—Accessories
    • B22C21/14—Accessories for reinforcing or securing moulding materials or cores, e.g. gaggers, chaplets, pins, bars

Definitions

  • the invention relates to a device for the self-supporting arrangement of a liquid solvent-soluble core in the form of a casting apparatus.
  • the generic DE 12 50 605 B discloses a device for cantilever mounting of cores pressed from sand or salt.
  • a ceramic coated steel tube (e) is screwed by means of a lag screw (g), which is pushed through the steel tube in a threaded nipple (f), which is located in the salt or sand core.
  • the object of the invention is to present a structurally simple mechanical device for the cantilevered arrangement of a liquid solvent-soluble core in the form of a casting device.
  • a device according to the invention for the self-supporting arrangement of a liquid solvent-soluble core in the form of a casting device are specially designed holding tubes.
  • these holding tubes one end is inserted into the core and the other end into the mold wall or into another part of the mold, for example a further core.
  • the core is then held by one or more holding tubes.
  • the holding tube has a smaller cross-section at the end inserted in the core than the end with which it is inserted into other parts of the casting mold.
  • the device in the form of a holding tube has the advantage that it can be used in particular for cores which have a small cross-section.
  • Such cores are, for example, the annular cores, as they are used for shaping of cooling channels in pistons, in particular in pistons of internal combustion engines.
  • the dimensions of the holding tubes according to the invention depend on the size of the core they are to carry.
  • the holding tubes can a Overall length, which is between 10 mm and 30 mm, the length of the stepped portion is between 3 mm and 7 mm.
  • the maximum diameter of the holding tube may depend on the diameter of the supply and discharge lines to the intended cavity in the casting and be between 3 mm and 20 mm.
  • the holding tubes have a diameter between 2 mm and 5 mm in the offset cylindrical part.
  • the wall thickness is between 0.1 mm and 0.6 mm.
  • the holding tubes may have a longitudinal slot or two opposite longitudinal slots, which, adapted to the length and diameter, may have a length between 1.5 mm and 4 mm and a width between 1 mm and 1.5 mm.
  • the material of the holding tube depends on the material of the melt, with which it should not react as possible that the holding function is impaired.
  • the material of the holding tube can be made of V2A steel, for example.
  • the holding tubes are usually plugged onto another tube or inserted into an opening of a part of the mold.
  • the tube or opening provides access to the core so that after casting or spraying, when the workpiece is solidified, the tube is drilled through that tube or opening to provide access to the core. Through this opening, the liquid dissolving the core is then fed and flushed the dissolved core.
  • a negative pressure can be applied to the holding tubes, whereby a degassing of the core during the casting or spraying process can be supported.
  • the area of the opening of the holding tube is larger and thereby supports the degassing.
  • the negative pressure is matched to the core composition. In the case of salt cores, for example, the negative pressure is 0.2 bar.
  • the exemplary embodiment shows the device for the cantilevered arrangement of an annular salt core, as it is used for shaping of cooling channels in pistons, in particular in pistons of internal combustion engines.
  • the annular cores are supported on its underside.
  • cup-shaped projections can be formed, in which the holding tubes are inserted.
  • the approaches mark at the same time the inflow and outflow openings of the cooling channels. Because of the piston wall thickness, these approaches must not extend much beyond the cross section of the cooling channel. On the other hand, the wall thickness of the approaches must be so large that they provide the holding tube the necessary support and the walls, especially on insertion, do not peel off. Hard cores are particularly sensitive.
  • An annular cooling passage in a piston may have, for example, an outer diameter of 75 mm and an oval cross section of 9 mm in height and 4 mm in width.
  • FIG. 1 shows an annular core 1, in the present case a salt core, for a cooling channel of a piston with the view of its cross-section 2 with an inserted retaining tube 3.
  • the cut passes through a center of a cup-shaped projection 4, in which the retaining tube 3 with its stepped cylindrical portion. 5 stuck and the core 1 holds.
  • the approach 4 of the core 1 marks an inlet or outlet opening of the annular channel in the piston and is the point at which the cavity of the annular channel to be formed for the removal of the core 1 is drilled through the retaining tube 3. It extends a few millimeters beyond the bottom of the core 3.
  • the adjoining the stepped cylindrical part 5, undeformed part 6 of the holding tube 3 can be stuck with its end, not shown here, in another tube or the wall of a mold or in another core.
  • the stepped cylindrical part 5 of the holding tube 3 has two longitudinal and parallel slots 7. They increase the cross-sectional area of the discharge opening 8 in the case of possibly provided degassing of the core 1.
  • FIG. 2 clearly shows that due to the reduced cross section of the holding tube 3 in its remote cylindrical part 5 of the projection 4 does not extend substantially beyond the outer periphery of the core 1 and thus the wall of the Piston is not weakened in the region of its cooling channel.
  • FIG. 3 shows an example of a retaining tube according to the invention 3 in the side view, partially cut. Its total length 9 is 18 mm, the length of the stepped part 10 is 6 mm, and the length 11 of the stepped cylindrical part 5 inserted in the core is 4 mm long. In between is a conical part 12 of 2 mm in length. In the stepped cylindrical part 5, two parallel slots 7 are arranged with a length 13 of 2.5 mm and a width 14 of 1.5 mm.
  • the undeformed part 6 of the holding tube 3 has a diameter 15 of 4 mm, the diameter 16 of the stepped cylindrical Part 5 is 3 mm.
  • the wall thickness 17 is 0.6 mm.
  • the material of the holding tube 3 is V2A steel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Coating Apparatus (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
EP09780067.6A 2008-07-17 2009-07-01 Einrichtung zum tragen von kernen Not-in-force EP2313219B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09780067T PL2313219T3 (pl) 2008-07-17 2009-07-01 Urządzenie do noszenia rdzeni

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008040507A DE102008040507A1 (de) 2008-07-17 2008-07-17 Einrichtung zum Tragen von Kernen
PCT/EP2009/058276 WO2010006925A1 (de) 2008-07-17 2009-07-01 Einrichtung zum tragen von kernen

Publications (2)

Publication Number Publication Date
EP2313219A1 EP2313219A1 (de) 2011-04-27
EP2313219B1 true EP2313219B1 (de) 2013-09-25

Family

ID=41131761

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09780067.6A Not-in-force EP2313219B1 (de) 2008-07-17 2009-07-01 Einrichtung zum tragen von kernen

Country Status (8)

Country Link
EP (1) EP2313219B1 (es)
CN (1) CN102159343B (es)
BR (1) BRPI0915999A2 (es)
DE (1) DE102008040507A1 (es)
MX (1) MX2011000504A (es)
PL (1) PL2313219T3 (es)
RU (1) RU2502580C2 (es)
WO (1) WO2010006925A1 (es)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010002999A1 (de) * 2010-03-18 2011-09-22 Maxicore Gmbh Verfahren und Vorrichtung zur Herstellung eines Gussstücks mit einem Hohlraum
DE102011086411A1 (de) * 2011-11-15 2013-05-16 Mahle International Gmbh Gießform für einen Kolben
CN102728789A (zh) * 2012-07-24 2012-10-17 湖南江滨机器（集团）有限责任公司 活塞模具的烫模方法及预热方法
GB202113798D0 (en) 2021-09-27 2021-11-10 Univ Tartu Microfluidics method

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1250605B (de) * 1964-10-14 1967-09-21 Karl Schmidt Ges Mit Beschraen Einrichtung zur freitragenden Befestigung von aus Sand oder Salz gepressten Kernteilen
DE4238851A1 (de) 1992-11-18 1994-05-19 Kolbenschmidt Ag Wasserlöslicher Salzkern für das Kokillengießen und Einrichtung zur Befestigung des Salzkerns
CN1106324A (zh) * 1994-02-07 1995-08-09 北京粉末冶金研究所 金属腔形制件的注塑成型方法
RU2098229C1 (ru) * 1995-06-29 1997-12-10 Георгий Петрович Савин Кокиль для отливки поршня с охлаждаемой полостью
JP3548369B2 (ja) * 1997-02-17 2004-07-28 株式会社日立ユニシアオートモティブ 内燃機関のピストン
DE10131725B4 (de) 2001-06-29 2004-02-12 Ks Kolbenschmidt Gmbh Unter Krafteinwirkung in der Gießvorrichtung gehaltener Salzkern
JP4068918B2 (ja) * 2002-08-01 2008-03-26 本田技研工業株式会社 中子に装着して用いられるケレン
JP2006102750A (ja) * 2004-09-30 2006-04-20 Mazda Motor Corp ケレン及びそのケレンの中子に対する装着構造

Also Published As

Publication number Publication date
PL2313219T3 (pl) 2014-04-30
RU2502580C2 (ru) 2013-12-27
EP2313219A1 (de) 2011-04-27
BRPI0915999A2 (pt) 2019-04-09
CN102159343A (zh) 2011-08-17
WO2010006925A1 (de) 2010-01-21
MX2011000504A (es) 2011-04-21
CN102159343B (zh) 2015-03-25
RU2011105722A (ru) 2012-08-27
DE102008040507A1 (de) 2010-01-21

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