EP1218130B1 - Mould for producing a box piston - Google Patents

Mould for producing a box piston Download PDF

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Publication number
EP1218130B1
EP1218130B1 EP00930985A EP00930985A EP1218130B1 EP 1218130 B1 EP1218130 B1 EP 1218130B1 EP 00930985 A EP00930985 A EP 00930985A EP 00930985 A EP00930985 A EP 00930985A EP 1218130 B1 EP1218130 B1 EP 1218130B1
Authority
EP
European Patent Office
Prior art keywords
piston
mould
pivotable
producing
core
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
EP00930985A
Other languages
German (de)
French (fr)
Other versions
EP1218130A2 (en
Inventor
Peter Tilch
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.)
Mahle GmbH
Original Assignee
Mahle 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 Mahle GmbH filed Critical Mahle GmbH
Publication of EP1218130A2 publication Critical patent/EP1218130A2/en
Application granted granted Critical
Publication of EP1218130B1 publication Critical patent/EP1218130B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
    • B22D15/02—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor of cylinders, pistons, bearing shells or like thin-walled objects
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49249—Piston making

Definitions

  • the invention relates to a casting mold for producing a box piston according to the preamble of claim 1.
  • Such a piston is known from the US 5,058,489 ,
  • the production is usually carried out by casting an aluminum alloy in a metal mold.
  • the recess or Hochg facedung between hub support and ring band (see Fig. 2 of the document) is produced by linearly displaceable core parts. Due to the purely linear displacement of the core, the shape of the recesses and thus the possible weight reduction of the piston limits.
  • a mold for producing a piston for an internal combustion engine from the EP 0 605 910 A1 discloses a mold for the production of a piston, in which a pivotable core is used describes. Cavities at the lower part of the piston are formed by linearly displaceable cores and through these linearly displaceable cores pinholes are in turn pushed linearly therethrough. The sleeve must therefore not be moved to open the mold, only for molding the finished piston.
  • the invention is therefore concerned with the problem of allowing a variable shape of the recesses by means of a novel mold in box piston with recesses between the ring band and hub support and, if necessary. to create certain shape features in the box wall in a simple way.
  • the casting core producing the recess may be integral with the window insert of the casting mold, the casting core may be connectable to the window insert, or the window insert and the casting core generating the recess are pivotable independently of each other or window insert is only linearly displaceable.
  • window insert is understood to mean that part of the mold which shapes the piston, in particular in the area of the outwardly pointing box walls and the adjacent hubs.
  • a suiting slope or a tightening angle dependent on the point of rotation of the casting core must be provided for the smooth formation of the casting, the position of which varies in contrast to the known casting cores and whose size can also be locally different.
  • the sleeves 2 are first drawn during the forming, which produce openings 3 in the region of the bolt eye. Only after the quill 2 is completely pulled out of the pivotable window part 4, this can be folded laterally by pivoting about the pivot point 5 and formed. Subsequently, the mold, not shown, can be ascended.
  • the casting cores 6 for producing the recesses 7 are an integral part of the pivotable window or Kokillenmaschine 4 and integrally connected thereto.
  • pivotable window parts 4 it is also possible with the pivotable window parts 4 to produce radii of curvature at openings 8 by means of corresponding contours 9 on the window part 4. Furthermore, it is possible with the pivoting window parts 4, at the lower end of the box wall to produce a reinforcing collar 10 by corresponding contours 11 of the pivotal window part 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Mounting Of Bearings Or Others (AREA)

Description

Die Erfindung betrifft eine Gießform zur Herstellung eines Kastenkolbens nach dem Oberbegriff des Anspruchs 1.The invention relates to a casting mold for producing a box piston according to the preamble of claim 1.

Unter Kastenkolben sind dabei Kolben zu verstehen, die unterhalb eines etwa kreiszylindrischen, die Kolbenringe aufnehmenden Bereichs durchgehend eine Außenkontur aufweisen, die von der Kreisform stark abweicht, indem die Naben und die Kastenwände zur Kolbenmittelachse hin eingezogen sind und nur noch im Bereich der Druck- und der Gegendruckseite vom Kolbendurchmesser bestimmte, tragende Schaftwandabschnitte vorliegen.Under box piston piston are to be understood that below an approximately circular cylindrical, the piston rings receiving area continuously have an outer contour which deviates greatly from the circular shape by the hubs and the box walls are retracted towards the piston center axis and only in the area of pressure and the counter-pressure side of the piston diameter certain, supporting shaft wall sections are present.

Ein derartiger Kolben ist bekannt aus der US 5,058,489 . Die Herstellung erfolgt im Regelfall durch Gießen einer Aluminiumlegierung in einer Metallkokille. Dabei wird die Aussparung bzw. Hochgießung zwischen Nabenabstützung und Ringband (vgl. Fig. 2 der Schrift) durch linear verschiebbare Kernteile hergestellt. Bedingt durch die rein lineare Verschiebung des Kerns sind der Formgebung der Aussparungen und damit auch der möglichen Gewichtsverminderung des Kolbens Grenzen gesetzt.Such a piston is known from the US 5,058,489 , The production is usually carried out by casting an aluminum alloy in a metal mold. The recess or Hochgießung between hub support and ring band (see Fig. 2 of the document) is produced by linearly displaceable core parts. Due to the purely linear displacement of the core, the shape of the recesses and thus the possible weight reduction of the piston limits.

Ebenso sind herausschwenkbare Teile einer Gießform zur Herstellung eines Kolbens für einen Verbrennungsmotor aus der EP 0 605 910 A1 bekannt, die eine Form für die Herstellung eines Kolbens, bei dem ein schwenkbarer Kern eingesetzt wird, beschreibt. Hohlräume am unteren Teil des Kolbens werden durch linear verschiebbare Kerne geformt und durch diese linear verschiebbaren Kerne werden Pinolen wiederum linear hindurch geschoben. Die Pinole müssen also nicht zum Öffnen der Form verschoben werden, nur zum Ausformen des fertigen Kolbens.Similarly, are swing-out parts of a mold for producing a piston for an internal combustion engine from the EP 0 605 910 A1 discloses a mold for the production of a piston, in which a pivotable core is used describes. Cavities at the lower part of the piston are formed by linearly displaceable cores and through these linearly displaceable cores pinholes are in turn pushed linearly therethrough. The sleeve must therefore not be moved to open the mold, only for molding the finished piston.

Die Erfindung beschäftigt sich daher mit dem Problem, bei Kastenkolben mit Aussparungen zwischen Ringband und Nabenabstützung eine variable Formgebung der Aussparungen mittels einer neuartigen Gießform zu ermöglichen und ggfs. bestimmte Formmerkmale im Bereich der Kastenwand auf einfache Weise zu erzeugen.The invention is therefore concerned with the problem of allowing a variable shape of the recesses by means of a novel mold in box piston with recesses between the ring band and hub support and, if necessary. to create certain shape features in the box wall in a simple way.

Dieses Problem wird gelöst durch eine Gießform nach Anspruch 1. Vorteilhafte Weiterbildungen sind Gegenstand der Unteransprüche.This problem is solved by a mold according to claim 1. Advantageous developments are the subject of the dependent claims.

Unter axialer Richtung ist dabei die Richtung der Kolbenlängsachse zu verstehen, unter radialer Richtung eine senkrecht zur Längsachse stehende Richtung.Under the axial direction is to understand the direction of the piston longitudinal axis, under the radial direction perpendicular to the longitudinal axis direction.

Durch die Schwenkarbeit der die Aussparungen erzeugenden Gießkerne wird es möglich, Hinterschneidungen, insbesondere im Bereich hinter den Ringnuten, zu erzeugen, ohne die bisher bei Kolben hierzu notwendige Kernteilung vornehmen zu müssen.By the pivotal work of the recesses generating cores, it is possible to produce undercuts, in particular in the area behind the annular grooves, without having to make the necessary previously for pistons core division.

Dabei kann der die Aussparung erzeugende Gießkern einstückig mit dem Fenstereinsatz der Gießform sein, es kann der Gießkern mit dem Fenstereinsatz verbindbar sein oder der Fenstereinsatz und der die Aussparung erzeugende Gießkern sind unabhängig voneinander schwenkbar oder Fenstereinsatz ist nur linear verschiebbar. Unter Fenstereinsatz ist derjenige Teil der Kokille zu verstehen, der den Kolben insbesondere im Bereich der nach außen weisenden Kastenwände und der benachbarten Naben formt.In this case, the casting core producing the recess may be integral with the window insert of the casting mold, the casting core may be connectable to the window insert, or the window insert and the casting core generating the recess are pivotable independently of each other or window insert is only linearly displaceable. The term "window insert" is understood to mean that part of the mold which shapes the piston, in particular in the area of the outwardly pointing box walls and the adjacent hubs.

Ferner wird es gemäß einer nicht beanspructen Variante durch entsprechende Auswahl des Schwenkpunktes und des Anzugswinkels möglich, sofern auch gewichtsvermindernde Durchbrüche in den Kastenwänden erzeugt werden sollen, diese Durchbrüche ohne Verwendung von Pinolen herzustellen, indem die Verrundungsradien zumindest im oberen äußeren Bereich der Durchbrüche ebenfalls durch schwenkbare Fenstereinsätze erzeugt werden.Furthermore, it is possible according to an unclaimed variant by appropriate selection of the pivot point and the tightening angle, provided that weight-reducing openings in the box walls to be produced to produce these breakthroughs without the use of sleeves, by the radii of curvature at least in the upper outer Range of breakthroughs are also generated by pivoting window inserts.

Ähnlich wie bei linear verschiebbaren Gießkernen ist für die problemlose Ausformung des Gußteils eine Anzugsschräge bzw. ein vom Drehpunkt des Gießkerns abhängiger Anzugswinkel vorzusehen, dessen Lage im Unterschied zu den bekannten Gießkernen variiert und dessen Größe ebenfalls lokal unterschiedlich sein kann.Similar to linearly displaceable casting cores, a suiting slope or a tightening angle dependent on the point of rotation of the casting core must be provided for the smooth formation of the casting, the position of which varies in contrast to the known casting cores and whose size can also be locally different.

Die Erfindung wird im folgenden anhand eines Ausführungsbeispiels näher erläutert. Es zeigt:

Fig. 1
einen gegossenen Kastenkolben mit schwenkbarem Gießkern,
Fig. 2
das Ausformen des schwenkbaren Kerns,
Fig. 3
einen in Bolzenrichtung verlaufenden Schnitt neben den Bolzennaben,
Fig. 4
wie Fig. 3, Gießkern geschwenkt.
The invention will be explained in more detail below with reference to an embodiment. It shows:
Fig. 1
a cast box piston with a pivotable casting core,
Fig. 2
the shaping of the pivotable core,
Fig. 3
a cut in the bolt direction next to the pin bosses,
Fig. 4
as shown in Fig. 3, casting core pivoted.

Nach dem Gießen des Kolbens 1 werden beim Ausformen zunächst die Pinolen 2 gezogen, die im Bereich des Bolzenauges Öffnungen 3 erzeugen. Erst nachdem die Pinole 2 ganz aus dem schwenkbaren Fensterteil 4 gezogen ist, kann dieses durch Schwenken um den Drehpunkt 5 seitlich nach unten geklappt und ausgeformt werden. Anschließend kann die nicht dargestellte Kokille aufgefahren werden. Die Gießkerne 6 zur Erzeugung der Aussparungen 7 sind integraler Bestandteil der schwenkbaren Fenster- bzw. Kokillenteile 4 und einstückig mit diesen verbunden.After the casting of the piston 1, the sleeves 2 are first drawn during the forming, which produce openings 3 in the region of the bolt eye. Only after the quill 2 is completely pulled out of the pivotable window part 4, this can be folded laterally by pivoting about the pivot point 5 and formed. Subsequently, the mold, not shown, can be ascended. The casting cores 6 for producing the recesses 7 are an integral part of the pivotable window or Kokillenteile 4 and integrally connected thereto.

Der in Fig. 2 erkennbare, nicht schraffierte Krümmungsbereich des Fensterteils 4 macht deutlich, daß sich die Aussparung 7 über einen größeren Umfangswinkel - auch mehr als 90° - des Kolbens erstrecken kann.The recognizable in Fig. 2, non-hatched region of curvature of the window part 4 makes it clear that the recess 7 can extend over a larger circumferential angle - even more than 90 ° - of the piston.

Wie aus einer nicht beanspruchten Variante der Erfindung gemäß den Figuren 3 und 4 zu erkennen ist, ist es mit den schwenkbaren Fensterteilen 4 auch möglich, Verrundungsradien an Durchbrüchen 8 durch entsprechende Konturen 9 am Fensterteil 4 zu erzeugen. Ferner ist es mit den schwenkbaren Fensterteilen 4 möglich, am unteren Ende der Kastenwand einen Verstärkungsbund 10 durch entsprechende Konturen 11 des schwenkbaren Fensterteils 4 zu erzeugen.As can be seen from an unclaimed variant of the invention according to FIGS. 3 and 4, it is also possible with the pivotable window parts 4 to produce radii of curvature at openings 8 by means of corresponding contours 9 on the window part 4. Furthermore, it is possible with the pivoting window parts 4, at the lower end of the box wall to produce a reinforcing collar 10 by corresponding contours 11 of the pivotal window part 4.

Claims (2)

  1. Mould for producing a box piston (1) with an upper, roughly circular-cylindrical section for placing at easy two annular grooves, and a lower section, in which the hubs are located which are set back in the direction of the bolt axis towards the piston longitudinal axis and with recesses (7), which
    - are provided in circumferential direction at least in the region in front of the hubs and which
    - lie in axial direction at the level of the circular cylindrical section and
    - in radial direction between the hub support and the circular-cylindrical section,
    wherein the mould comprises a pivotable mould core (3) and a sleeve (2),
    characterised in that the sleeve (2) is mounted in a translatory displaceable manner in the pivotable mould core to produce the recess (7).
  2. Mould according to claim 1, characterised in that the pivotable mould core (6) is connected in one piece with a window insert (4).
EP00930985A 1999-05-19 2000-03-21 Mould for producing a box piston Expired - Lifetime EP1218130B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19922809A DE19922809A1 (en) 1999-05-19 1999-05-19 Casting process used in the production of pistons comprises producing recesses by cores that move on deformation
DE19922809 1999-05-19
PCT/DE2000/000921 WO2000072116A2 (en) 1999-05-19 2000-03-21 Method for producing a box piston

Publications (2)

Publication Number Publication Date
EP1218130A2 EP1218130A2 (en) 2002-07-03
EP1218130B1 true EP1218130B1 (en) 2007-07-11

Family

ID=7908416

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00930985A Expired - Lifetime EP1218130B1 (en) 1999-05-19 2000-03-21 Mould for producing a box piston

Country Status (7)

Country Link
US (1) US6546993B1 (en)
EP (1) EP1218130B1 (en)
JP (1) JP4732595B2 (en)
BR (1) BR0011270B1 (en)
DE (2) DE19922809A1 (en)
ES (1) ES2290036T3 (en)
WO (1) WO2000072116A2 (en)

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US7401638B2 (en) * 2002-03-28 2008-07-22 Delta Electronics, Inc. Heat-dissipating device and its manufacturing process
DE10325917A1 (en) 2003-06-07 2005-03-31 Mahle Gmbh Piston for an internal combustion engine and casting process for its production
US7104183B2 (en) * 2004-07-07 2006-09-12 Karl Schmidt Unisia, Inc. One-piece steel piston
US20080128946A1 (en) * 2005-02-10 2008-06-05 Boye David J Mold assembly for lightweight pistons
US20070073674A1 (en) * 2005-09-26 2007-03-29 Bea Systems, Inc. System and method for providing federated events for content management systems
KR101404498B1 (en) 2006-11-08 2014-06-09 페더럴-모걸 코오포레이숀 Piston having twisted skirt panels
US7891403B2 (en) * 2007-04-13 2011-02-22 Federal-Mogul Powertrain, Inc. Piston mold assembly and method of constructing a piston therewith
DE102008048497A1 (en) 2008-09-23 2010-04-08 Ks Kolbenschmidt Gmbh Method for producing a piston of an internal combustion engine with a multi-part slide
DE102010064078A1 (en) 2010-12-23 2012-06-28 Federal-Mogul Nürnberg GmbH Casting device for a piston for an internal combustion engine and method for opening and / or closing a casting device
KR102068372B1 (en) 2012-03-12 2020-01-20 테네코 인코퍼레이티드 Engine piston
US8459332B1 (en) 2012-07-09 2013-06-11 Kevin M. O'Connor Piston outer panel mold and method of constructing a piston and forming an undercut cooling gallery of a piston therewith
KR101634788B1 (en) * 2015-09-04 2016-06-30 동양피스톤 주식회사 eco mold device for producing piston and mold device for producing piston and piston producing method
KR101615274B1 (en) * 2015-09-04 2016-04-25 동양피스톤 주식회사 eco mold device for producing piston and mold device for producing piston and piston producing method
SE543272C2 (en) 2019-03-06 2020-11-10 Husqvarna Ab Engine piston, engine, hand-held tool, and method of manufacturing an engine piston
DE102020106059A1 (en) 2020-03-06 2021-09-09 Bayerische Motoren Werke Aktiengesellschaft Method for producing a cast component and casting station

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Also Published As

Publication number Publication date
DE50014483D1 (en) 2007-08-23
DE19922809A1 (en) 2000-11-23
EP1218130A2 (en) 2002-07-03
BR0011270A (en) 2003-07-15
WO2000072116A3 (en) 2002-04-25
US6546993B1 (en) 2003-04-15
JP4732595B2 (en) 2011-07-27
BR0011270B1 (en) 2014-05-27
WO2000072116A2 (en) 2000-11-30
JP2003522313A (en) 2003-07-22
ES2290036T3 (en) 2008-02-16

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