EP1333949A1 - Method of producing by casting a piston with a cooled ring carrier - Google Patents

Method of producing by casting a piston with a cooled ring carrier

Info

Publication number
EP1333949A1
EP1333949A1 EP01996444A EP01996444A EP1333949A1 EP 1333949 A1 EP1333949 A1 EP 1333949A1 EP 01996444 A EP01996444 A EP 01996444A EP 01996444 A EP01996444 A EP 01996444A EP 1333949 A1 EP1333949 A1 EP 1333949A1
Authority
EP
European Patent Office
Prior art keywords
ring carrier
cooled
piston
cooled ring
producing
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.)
Granted
Application number
EP01996444A
Other languages
German (de)
French (fr)
Other versions
EP1333949B1 (en
Inventor
Martin RÜHLE
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 EP1333949A1 publication Critical patent/EP1333949A1/en
Application granted granted Critical
Publication of EP1333949B1 publication Critical patent/EP1333949B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0009—Cylinders, pistons
    • B22D19/0027—Cylinders, pistons pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium

Definitions

  • the invention relates to a method for producing a piston with a cooled ring carrier, consisting of a ring carrier part and a sheet metal part connected thereto.
  • Such a ring carrier and a corresponding manufacturing method are known from DE 19750021.
  • the cooled ring carrier is pre-coated with piston material in an aluminum-based melt.
  • a layer of iron aluminides forms on the iron base material of the ring carrier, which layer serves as a binding layer in the piston between the aluminum material and the iron material of the ring carrier.
  • the ring carrier part usually consists of a Niresist material with lamellar graphite formation.
  • the invention is therefore concerned with the problem of avoiding imperfections in the ring carrier bond of cooled ring carriers. This problem is solved in generic methods by the characterizing feature of claim 1. Advantageous further developments are the subject of the dependent claims.
  • the ring carrier part and the sheet metal part should be connected by a normally gastight connection, for example by welding or soldering.
  • Fig. 1 shows a cooled ring carrier in the welded state.
  • the cooled ring carrier 1 consists of a ring carrier part 2 and a sheet metal part 3 welded to it, which together form a cooling channel 4 of a diesel piston.
  • the cooled ring carrier 1 or a plurality of ring carriers is subjected to negative pressure in an evacuable vacuum container.
  • the vacuum is, for example, 10 mbar.
  • the negative pressure can rise to 20-50 mbar after some time.
  • the ring carriers In order to ensure pressure compensation in the case of the leaky ring carriers, the ring carriers must remain in the evacuated vacuum container for a minimum time, for example 24 hours.
  • High productivity can be achieved if a large number of vacuum containers filled with cooled ring carriers are evacuated at the same time in a larger boiler. This can be done by the vacuum containers having a lid loosely resting against a rubber seal.
  • the evacuable vacuum containers can be economically manufactured by using commercially available cut-to-length plastic pipes of sufficient material strength and dimensionally turned plastic covers that are provided with O-ring seals.
  • the ventilation valve can be provided in the plastic cover.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Pressure Vessels And Lids Thereof (AREA)

Abstract

The aim of the invention is to prevent, in a cooled ring carrier (1) for pistons, during Alfin bonding, the formation of oxides induced by air that escapes due to porous ring carrier material and, as a consequence, an impairment of the ring carrier bond. To this end, the cooled ring carrier, once the ring carrier part and the sheet metal part (3) have been linked, is subjected to negative pressure in a vacuum tank.

Description

Verfahren zur gießtechnischen Herstellung eines Kolbens mit einem gekühlten Ringträger Process for the production by casting of a piston with a cooled ring carrier
Die Erfindung betrifft ein Verfahren zur Herstellung eines Kolbens mit einem gekühlten Ringträger, bestehend aus einem Ringträgerteil und einem mit diesem verbundenen Blechteil .The invention relates to a method for producing a piston with a cooled ring carrier, consisting of a ring carrier part and a sheet metal part connected thereto.
Ein derartiger Ringträger und ein entsprechendes Herstellungsverfahren sind aus der DE 19750021 bekannt. Der gekühlte Ringträger wird vor dem Umgießen mit Kolbenmaterial in einer Aluminiumbasis-Schmelze alfiniert. Beim Alfinieren bildet sich auf dem Eisenbasismaterial des Ringträgers eine Schicht aus Eisenaluminiden, die im Kolben als Bindeschicht zwischen dem Aluminiumwerkstoff und dem Eisenwerkstoff des Ringträgers dient. Das Ringträgerteil besteht im Regelfall aus einem Niresist- erkstoff mit lamellarer Graphitausbildung.Such a ring carrier and a corresponding manufacturing method are known from DE 19750021. The cooled ring carrier is pre-coated with piston material in an aluminum-based melt. During alfining, a layer of iron aluminides forms on the iron base material of the ring carrier, which layer serves as a binding layer in the piston between the aluminum material and the iron material of the ring carrier. The ring carrier part usually consists of a Niresist material with lamellar graphite formation.
Es hat sich nun gezeigt, daß beim Alfinieren des gekühlten Ringträgers der Gasdruck im Kühlkanal ansteigt und, da der Ringträger-Werkstoff nicht immer porenfrei vorliegt, im Einzelfall überraschenderweise auch eingeschlossene Luft aus dem Kühlkanal entweichen kann. Dies führt im Alfinbad zur Bildung von Oxidhäuten, die am gekühlten Ringträger anhaften und am fertigen Kolben Fehlstellen in der Ringträgerbindung darstellen.It has now been shown that when the cooled ring carrier is refined, the gas pressure in the cooling channel rises and, since the ring carrier material is not always free from pores, surprisingly, even enclosed air can escape from the cooling channel in individual cases. This leads to the formation of oxide skins in the Alfin bath, which adhere to the cooled ring carrier and represent defects in the ring carrier bond on the finished piston.
Die Erfindung beschäftigt sich daher mit dem Problem, Fehlstellen in der Ringträgerbindung von gekühlten Ringträgern zu vermeiden. Dieses Problem wird bei gattungsgemäßen Verfahren gelöst durch das kennzeichnende Merkmal des Anspruchs 1. Vorteilhafte Weiterbildungen sind Gegenstand der Unteransprüche.The invention is therefore concerned with the problem of avoiding imperfections in the ring carrier bond of cooled ring carriers. This problem is solved in generic methods by the characterizing feature of claim 1. Advantageous further developments are the subject of the dependent claims.
Das Verbinden von Ringträgerteil und Blechteil soll durch eine im Normalfall gasdichte Verbindungsart, beispielsweise durch Schweißen oder Löten erfolgen.The ring carrier part and the sheet metal part should be connected by a normally gastight connection, for example by welding or soldering.
Durch die Beaufschlagung mit Unterdruck kann - falls das Material des Ringträgers porös ist - im Kühlkanal eingeschlossene Luft entweichen und es wird die Bildung eines Überdrucks beim Alfinieren vermieden.By applying negative pressure - if the material of the ring carrier is porous - air trapped in the cooling channel can escape and the formation of overpressure during the finishing process is avoided.
Die Erfindung wird nachfolgend anhand eines Ausführungsbei- spiels näher erläutert. Es zeigt:The invention is explained in more detail below on the basis of an exemplary embodiment. It shows:
Fig. 1 einen gekühlten Ringträger im verschweißten Zustand.Fig. 1 shows a cooled ring carrier in the welded state.
Der gekühlte Ringträger 1 besteht aus einem Ringträgerteil 2 und einem mit diesem verschweißten Blechteil 3 , die gemeinsam einen Kühlkanal 4 eines Dieselkolbens bilden.The cooled ring carrier 1 consists of a ring carrier part 2 and a sheet metal part 3 welded to it, which together form a cooling channel 4 of a diesel piston.
Da das Material des Ringträgers nicht in allen Fällen gasdicht ist, kann es beim Alfinieren des gekühlten Ringträgers infolge Erhöhung des Innendrucks im Kühlkanal 4 zum Ausgasen und zur Bildung von Oxiden und Blasen kommen, die die Ringträgerbindung schädigen.Since the material of the ring carrier is not gas-tight in all cases, when the cooled ring carrier is refined, outgassing and the formation of oxides and bubbles which damage the ring carrier bond can occur as a result of increasing the internal pressure in the cooling channel 4.
Um dies zu vermeiden, wird der gekühlte Ringträger 1 oder eine Mehrzahl von Ringträgern in einem evakuierbaren Unterdruckbehälter mit Unterdruck beaufschlagt. Der Unterdruck liegt beispielsweise bei 10 mbar. Je nach Anzahl der un- dichten Ringträger und in Abhängigkeit vom Behältervolumen kann der Unterdruck nach einiger Zeit auf 20-50 mbar ansteigen.To avoid this, the cooled ring carrier 1 or a plurality of ring carriers is subjected to negative pressure in an evacuable vacuum container. The vacuum is, for example, 10 mbar. Depending on the number of dense ring carrier and depending on the container volume, the negative pressure can rise to 20-50 mbar after some time.
Um bei den undichten Ringträgern einen Druckausgleich sicherzustellen, müssen die Ringträger eine Mindestzeit, beispielsweise 24 Stunden, im evakuierten Unterdruckbehälter verbleiben.In order to ensure pressure compensation in the case of the leaky ring carriers, the ring carriers must remain in the evacuated vacuum container for a minimum time, for example 24 hours.
Eine hohe Produktivität kann erreicht werden, wenn in einem größeren Kessel eine Vielzahl von mit gekühlten Ringträgern gefüllten Unterdruckbehältern gleichzeitig evakuiert werden. Dies kann erfolgen, indem die Unterdruckbehälter einen lose gegen eine Gummidichtung anliegenden Deckel aufweisen.High productivity can be achieved if a large number of vacuum containers filled with cooled ring carriers are evacuated at the same time in a larger boiler. This can be done by the vacuum containers having a lid loosely resting against a rubber seal.
Beim Evakuieren des Kessels auf einen Unterdruck von beispielsweise 10 mbar kann durch den lose aufliegenden Deckel Luft aus den Unterdruckbehältern entweichen. Sobald der Kessel belüftet wird dichtet der Deckel gegen die Gummidichtung ab, sodaß der Unterdruckbehälter evakuiert bleibt. Erst kurz vor der Entnahme der gekühlten Ringträger wird der Unterdruckbehälter über ein Ventil belüftet und es werden die Ringträger nach der Entnahme sobald wie möglich in das Alfinbad getaucht, um ein Rückströmen von Luft in die undichten Ringträger zu vermeiden.When the boiler is evacuated to a vacuum of, for example, 10 mbar, air can escape from the vacuum containers through the loosely placed cover. As soon as the boiler is ventilated, the lid seals against the rubber seal so that the vacuum container remains evacuated. The vacuum container is only ventilated via a valve shortly before the cooled ring carriers are removed and the ring carriers are immersed in the alfin bath as soon as possible after the removal to prevent air from flowing back into the leaky ring carriers.
Die evakuierbaren Unterdruckbehälter können durch Verwendung von handelsüblichen abgelängten Plastikrohren ausreichender Materialstärke und maßgedrehten Kunststoffdeckein, die mit O-Ringdichtungen versehen sind, wirtschaftlich hergestellt werden. Im Kunststoffdeckel kann das Belüftungsventil vorgesehen sein. The evacuable vacuum containers can be economically manufactured by using commercially available cut-to-length plastic pipes of sufficient material strength and dimensionally turned plastic covers that are provided with O-ring seals. The ventilation valve can be provided in the plastic cover.

Claims

Patentansprüche claims
Verfahren zur Herstellung eines Kolbens mit einem gekühlten Ringträger (1), bestehend aus einem Ringträgerteil (2) und einem mit diesem verbundenen Blechteil (3), das im Kolben in Verbindung mit dem Ringträgerteil (2) einen Kühlkanal (4) bildet, wobei der gekühlte Ringträger (1) vor dem Umgießen mit dem Kolbenwerkstoff in einer Schmelze auf Aluminiumbasis alfiniert wird, dadurch gekennzeichne , daß der gekühlte Ringträger (1) nach dem Verbinden von Ringträgerteil (2) und Blechteil (3) in einem evakuierbaren Unterdruckbehälter mit Unterdruck beaufschlagt wird.Method for producing a piston with a cooled ring carrier (1), consisting of a ring carrier part (2) and a sheet metal part (3) connected to it, which forms a cooling channel (4) in the piston in connection with the ring carrier part (2), the Cooled ring carrier (1) is alfined in an aluminum-based melt before casting with the piston material, characterized in that the cooled ring carrier (1) is subjected to negative pressure in an evacuable vacuum container after connecting the ring carrier part (2) and sheet metal part (3) ,
Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der gekühlte Ringträger ( 1) nach der Entnahme aus dem Unterdruckbehälter vakuumverpackt wird.Method according to claim 1, characterized in that the cooled ring carrier (1) is vacuum-packed after removal from the vacuum container.
Verfahren nach Anspruch 1, dadurch gekennzeichne , daß der gekühlte Ringträger (1) erst kurz vor dem Eintauchen in das Alfinbad aus dem evakuierbaren Unterdruckbehälter entnommen wird. A method according to claim 1, characterized in that the cooled ring carrier (1) is only removed from the evacuable vacuum container shortly before immersion in the alfin bath.
EP01996444A 2000-11-18 2001-10-19 Method of producing by casting a piston with a cooled ring carrier Expired - Lifetime EP1333949B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10057366A DE10057366A1 (en) 2000-11-18 2000-11-18 Method for producing a piston with cooled ring carrier
DE10057366 2000-11-18
PCT/DE2001/004003 WO2002040202A1 (en) 2000-11-18 2001-10-19 Method of producing by casting a piston with a cooled ring carrier

Publications (2)

Publication Number Publication Date
EP1333949A1 true EP1333949A1 (en) 2003-08-13
EP1333949B1 EP1333949B1 (en) 2006-05-31

Family

ID=7663867

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01996444A Expired - Lifetime EP1333949B1 (en) 2000-11-18 2001-10-19 Method of producing by casting a piston with a cooled ring carrier

Country Status (8)

Country Link
US (1) US6837298B2 (en)
EP (1) EP1333949B1 (en)
JP (1) JP4705313B2 (en)
KR (1) KR100865409B1 (en)
BR (1) BR0115403A (en)
DE (2) DE10057366A1 (en)
ES (1) ES2264996T3 (en)
WO (1) WO2002040202A1 (en)

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Publication number Priority date Publication date Assignee Title
DE10134293B4 (en) * 2001-07-14 2009-06-04 Mahle Gmbh Cooled ring carrier for a piston
DE10352244A1 (en) * 2003-11-08 2005-06-09 Mahle Gmbh Method for producing a piston for an internal combustion engine
DE102004010763C5 (en) * 2004-03-05 2008-06-12 Daimler Ag composite component
CN1943915A (en) * 2005-10-08 2007-04-11 山东滨州渤海活塞股份有限公司 Method for casting piston blank with inner cooling path by liquid state extruding casting process
DE102005061074A1 (en) * 2005-12-21 2007-06-28 Mahle International Gmbh Piston for combustion engine e.g. diesel engine, has radially outward oriented wall zone of cooling channel formed by ring carrier
DE102013019506A1 (en) 2013-11-21 2015-06-03 Mahle International Gmbh Ring carrier for a piston of an internal combustion engine and pistons for an internal combustion engine
US20180046560A1 (en) * 2016-08-12 2018-02-15 Dash Robotics, Inc. Device-agnostic systems, methods, and media for connected hardware-based analytics

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Also Published As

Publication number Publication date
KR100865409B1 (en) 2008-10-24
KR20030053060A (en) 2003-06-27
JP2004513789A (en) 2004-05-13
ES2264996T3 (en) 2007-02-01
DE50109980D1 (en) 2006-07-06
US20040026062A1 (en) 2004-02-12
DE10057366A1 (en) 2002-05-23
US6837298B2 (en) 2005-01-04
JP4705313B2 (en) 2011-06-22
WO2002040202A1 (en) 2002-05-23
BR0115403A (en) 2003-10-07
EP1333949B1 (en) 2006-05-31

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