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EP1907684A1 - Procede de fabrication d'un piston pour un moteur a combustion interne, et piston pour un moteur a combustion interne - Google Patents

Procede de fabrication d'un piston pour un moteur a combustion interne, et piston pour un moteur a combustion interne

Info

Publication number
EP1907684A1
EP1907684A1 EP06754607A EP06754607A EP1907684A1 EP 1907684 A1 EP1907684 A1 EP 1907684A1 EP 06754607 A EP06754607 A EP 06754607A EP 06754607 A EP06754607 A EP 06754607A EP 1907684 A1 EP1907684 A1 EP 1907684A1
Authority
EP
European Patent Office
Prior art keywords
piston
melt
internal combustion
combustion engine
treated
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.)
Ceased
Application number
EP06754607A
Other languages
German (de)
English (en)
Inventor
Simon Reichstein
Lothar Hofmann
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.)
Federal Mogul Nuernberg GmbH
Original Assignee
Federal Mogul Nuernberg 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 Federal Mogul Nuernberg GmbH filed Critical Federal Mogul Nuernberg GmbH
Publication of EP1907684A1 publication Critical patent/EP1907684A1/fr
Ceased legal-status Critical Current

Links

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 
    • F02F3/10—Pistons  having surface coverings
    • F02F3/12—Pistons  having surface coverings on piston heads
    • F02F3/14—Pistons  having surface coverings on piston heads within combustion chambers
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
    • 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 
    • F02F3/26—Pistons  having combustion chamber in piston head
    • 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 method for producing a piston with a combustion bowl for an internal combustion engine and such a piston for an internal combustion engine.
  • Pistons are constantly subjected to changes in operating conditions in internal combustion engines. Every start and / or AbsehaltVorgang and every change of a load case leads to a strong change in the temperature distribution in the piston. These changes in the temperature distributions cause internal stresses which can lead to plastic deformation and ultimately failure of the piston.
  • the invention has for its object to provide a method for producing an engine piston and an engine piston, by means of which the life and reliability of an engine piston is further increased.
  • a region of the combustion bowl comprising at least one depression base is melt-treated, such that a structure of the material in the melt-treated region is changed in a layer having a definable depth.
  • the material is "remelted" in the melt-treated area.
  • the material has an altered structure, for example a changed particle size, relative to the underlying material of the piston. so that sets a finer microstructure.
  • the finer structure better withstands changing loads.
  • the depth of the layer is determined appropriately. It can range from a few to a few mm. The depth is determined so that a structure of the material is changed.
  • the remelting counteracts a failure of the piston in the trough bottom, for example due to changes in the temperature distribution, so that the service life of the piston is prolonged.
  • tools used for the melting treatment are appropriately adapted to the geometry of the trough base.
  • the area is heated by arc welding process, laser and / or electron beam and / or remelted by an inductive heating.
  • arc welding process laser and / or electron beam and / or remelted by an inductive heating.
  • other forms of energy input are also conceivable.
  • the area is heated by an energy input with a power between 2 and 8kW.
  • a depth of the melt-treated layer can be influenced.
  • the melt-treated area is subsequently cooled at a cooling rate or rate of 100-1000 K / s.
  • a cooling rate or rate of 100-1000 K / s In technical remelting processes, solidification rates are possible within a very wide range, namely between 10 3 and 10 " 10 K / s the higher the cooling rate, the finer the particles crystallize in the melt.
  • the cooling rate of 100-1000 K / s for pistons with silicon content has proven to be particularly favorable. However, the rate can be exceeded or undershot, at least for pistons without silicon content.
  • the preferred cooling rate of 100-1000 K / s was determined as follows. It has been determined by experiments that the cooling rate must be at least 100 K / s, so that a sufficient proportion of the primary silicon, which may be present in the piston to be produced, is sufficiently fine, so that dispersion hardening of the material occurs. A slower solidification would lead to a coarser structure, which does not have the desired properties. Thus, as a minimum cooling rate, 100 K / s can be given for certain piston materials.
  • a piston which consists of an alloy is preferably machined by the method according to the invention.
  • the alloy has a main alloying element and at least one further alloying element.
  • the resistance to thermal fatigue can be improved by introducing the main alloying element.
  • this embodiment differs from the hitherto conventionally chosen approaches.
  • strength-increasing elements such as silicon, nickel, copper or magnesium, introduced.
  • Such alloying elements for example, locally increase the strength of an aluminum alloy piston. It was always assumed that by increasing the strength-increasing alloying element, the properties with regard to thermal shock resistance can also be improved.
  • the effect according to the invention can be achieved by introducing the main alloying element in pure form as an additional material.
  • the same effect can be produced by incorporating an alloy containing the main alloying element and at least one alloying element of the bulb alloy, but which is present in the filler material at a lower concentration than in the piston to be treated. This also partially reduces the concentration of the alloying element and increases the thermal stability of the piston, at least in this area.
  • this process step is basically independent of other features of the invention, in particular the specified cooling rate.
  • the heat resistance can be improved by melting the piston at least in regions by means of a welding process, and introducing the main alloy element as a filler, so that the concentration of the main alloy element is increased at least in some regions.
  • all other features mentioned above and below can be advantageously used.
  • the piston according to the invention which may have a finer structure and an increased concentration of the main alloy element at least in some areas compared to other areas, without particles of the size specified below for the piston according to the invention.
  • the features of the piston according to the invention can also be combined with one another in a manner described herein.
  • the piston is remelted in a layer having a depth greater than 200 microns, especially at least 300 microns. This achieves a change in the structure of the material.
  • the piston is additionally treated and / or processed on the surface.
  • the remelting process is thus not always the last processing step. Further processing steps, for example, for a smoothing of the surface can connect.
  • an area adjacent thereto is melt-treated in addition to the trough base.
  • a remelting treatment it is conceivable to subject the entire combustion bowl to a remelting treatment.
  • low solidification rates are achieved, inter alia, by the fact that a melt-treated area is spatially limited. If a larger area to be remelted, a treatment in several steps is preferable.
  • a piston for an internal combustion engine wherein the piston has a combustion bowl, the combustion bowl is melt-treated in a region comprising at least the well base and a material in the melt-treated area is remelted, so that a structure of the material in the melt-treated Range is changed compared to the untreated areas of the remaining piston in a layer with a definable depth.
  • An expected life of a piston with remelted trough bottom is considerably higher than that of conventional pistons.
  • the material structure in the melt-treated area is preferably modified in a layer having a depth of more than 200 ⁇ m, in particular more than 300 ⁇ m.
  • the piston has a finer structure in the melt-treated area compared to untreated areas of the piston, preferably with particles smaller than 10 ⁇ 6 m .
  • the piston is preferably provided as a diesel piston. Diesel pistons, in particular truck pistons, are exposed to special thermal loads. A reinforcement of the trough bottom by remelting is particularly advantageous.
  • the figure shows schematically a piston 1 of an internal combustion engine with a combustion chamber trough 2.
  • the transition between the piston head 3 and the combustion chamber trough 2 is referred to as trough edge.
  • the bottom of the combustion bowl 2 is referred to as a trough base 20.
  • the trough base 20 is at least partially remelted.
  • the remelting is preferably carried out by an arc welding process.
  • the surface of the piston 1 is melted by the arc in the region of the trough base 20.
  • a subsequent solidification speed is many times higher than in a casting of the piston 1. As a result, a finer microstructure arises in the remelted region of the hollow bottom 20 than in the remaining piston 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

Procédé de fabrication d'un piston (1) pourvu d'un renfoncement (2) de chambre de combustion, pour un moteur à combustion interne, selon lequel au moins une zone du renfoncement (2) de chambre de combustion comportant au moins un fond (20) de renfoncement est traitée par fusion, pour faire refondre une matière dans la zone traitée par fusion, si bien qu'une structure de matière dans la zone traitée par fusion est transformée en une couche à épaisseur pouvant être fixée. La présente invention concerne également un piston (1) ainsi obtenu.
EP06754607A 2005-07-26 2006-06-26 Procede de fabrication d'un piston pour un moteur a combustion interne, et piston pour un moteur a combustion interne Ceased EP1907684A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005034905A DE102005034905A1 (de) 2005-07-26 2005-07-26 Verfahren zur Herstellung eines Kolbens für einen Verbrennungsmotor sowie Kolben für einen Verbrennungsmotor
PCT/EP2006/006262 WO2007012373A1 (fr) 2005-07-26 2006-06-28 Procede de fabrication d'un piston pour un moteur a combustion interne, et piston pour un moteur a combustion interne

Publications (1)

Publication Number Publication Date
EP1907684A1 true EP1907684A1 (fr) 2008-04-09

Family

ID=36975317

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06754607A Ceased EP1907684A1 (fr) 2005-07-26 2006-06-26 Procede de fabrication d'un piston pour un moteur a combustion interne, et piston pour un moteur a combustion interne

Country Status (5)

Country Link
US (1) US20090000470A1 (fr)
EP (1) EP1907684A1 (fr)
JP (1) JP2009503320A (fr)
DE (1) DE102005034905A1 (fr)
WO (1) WO2007012373A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007044696A1 (de) * 2007-06-29 2009-01-08 Ks Kolbenschmidt Gmbh Schmelzbehandelter Muldenrand einer Kolben-Brennraummulde
DE102010001133B4 (de) * 2010-01-22 2016-04-07 Federal-Mogul Nürnberg GmbH Verfahren und Formteil zur Anwendung bei der Herstellung eines Kolbens für einen Verbrennungsmotor sowie Kolben für einen Verbrennungsmotor
DE102011083994A1 (de) * 2010-10-05 2012-04-05 Ks Kolbenschmidt Gmbh Verbesserungen an einem Brennraummuldenrand und an einem Brennraummuldengrund eines Kolbens einer Brennkraftmaschine
DE102012204947A1 (de) * 2012-03-28 2013-10-02 Mahle International Gmbh Verfahren zur Herstellung eines Aluminiumkolbens
DE102012212791B4 (de) * 2012-07-20 2014-02-27 Federal-Mogul Nürnberg GmbH Verfahren zur Herstellung eines Kolbens für einen Verbrennungsmotor
BR112015025346A2 (pt) 2013-04-05 2017-07-18 Federal Mogul Corp pistão produzido através do uso de técnicas de fabricação de aditivos
TWI823932B (zh) 2018-05-11 2023-12-01 中國大陸商迪哲（江蘇）醫藥有限公司 三唑并嘧啶化合物及其在治療癌症中之用途
DE102019207814A1 (de) * 2019-05-28 2020-12-03 Federal-Mogul Nürnberg GmbH Verfahren zum Umschmelzen eines Abschnitts eines Kolbens für einen Verbrennungsmotor

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Publication number Priority date Publication date Assignee Title
US3295198A (en) * 1964-03-13 1967-01-03 Robert L Coan Process of adhering stainless steel to aluminum and products produced thereby
US4401726A (en) * 1974-01-07 1983-08-30 Avco Everett Research Laboratory, Inc. Metal surface modification
US4074616A (en) * 1975-09-02 1978-02-21 Caterpillar Tractor Co. Aluminum piston with steel reinforced piston ring grooves
US4157923A (en) * 1976-09-13 1979-06-12 Ford Motor Company Surface alloying and heat treating processes
DE3114124A1 (de) * 1981-04-08 1982-10-28 Mahle Gmbh, 7000 Stuttgart Kolben aus aluminium mit hartoxidiertem boden
JPS59108849A (ja) * 1982-12-14 1984-06-23 Toyota Motor Corp 内燃機関用ピストン
DE3339867A1 (de) * 1982-12-16 1985-05-15 Kolbenschmidt AG, 7107 Neckarsulm Verfahren zur herstellung verschleissfester oberflaechen der ringnuten von aus aluminiumlegierungen bestehenden kolben fuer brennkraftmaschinen
US4643079A (en) * 1985-03-28 1987-02-17 General Motors Corporation Iron piston having selectively hardened ring groove
JPS62167846A (ja) * 1986-01-18 1987-07-24 Toyota Motor Corp 鋳鉄製内燃機関用ピストンおよびその製造方法
JPS62170486A (ja) * 1986-01-21 1987-07-27 Toyota Motor Corp 鋳鉄製内燃機関用ピストンおよびその製造方法
JPH051622A (ja) * 1991-01-28 1993-01-08 Hiratsuka Kinzoku Kogyo Kk 内燃機関用Ａｌ合金製ピストンおよびその製造方法
JPH08246947A (ja) * 1995-03-13 1996-09-24 Nissan Motor Co Ltd ピストンの製造方法
DE19902864A1 (de) * 1999-01-25 2000-06-29 Daimler Chrysler Ag Kolben für Brennkraftmaschinen mit Direkteinspritzung und Verfahren zu dessen Herstellung
EP1386687B2 (fr) * 2002-07-30 2015-02-25 Federal-Mogul Nürnberg GmbH Piston et sa méthode de fabrication
DE10335843A1 (de) * 2003-08-05 2005-03-10 Federal Mogul Nuernberg Gmbh Verfahren zur Herstellung eines Kolbens
DE102005047035B3 (de) * 2005-09-30 2007-04-19 Federal-Mogul Nürnberg GmbH Verfahren zur Herstellung eines Kolbens für einen Verbrennungsmotor sowie danach hergestellter Kolben

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
"Energiereiche Strahlen verbessern Eigenschaften von Motorenkolben", ALUMINIUM, ALUMINIUM VERLAG, DUESSELDORF, DE, vol. 62, 1 January 1986 (1986-01-01), pages 1,2,171, XP003021130, ISSN: 0002-6689 *
"Energiereiche Strahlen verbessern Eigenschaften von Motorenkolben", ALUMINIUM, vol. 62, 1986, pages 1,2,171, XP003021130
"Lokale Warmverformung - Elektronen Umschmelzen - Plasmastrahl Umschmelzen", KOLLOQUIUM 1973, 1973, pages 1,25, XP003021131
See also references of WO2007012373A1 *

Also Published As

Publication number Publication date
US20090000470A1 (en) 2009-01-01
JP2009503320A (ja) 2009-01-29
DE102005034905A1 (de) 2007-02-01
WO2007012373A8 (fr) 2008-05-29
WO2007012373A1 (fr) 2007-02-01

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