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US20040108025A1 - Method for pre-treating a ring support prior to the <alfin> process - Google Patents

Method for pre-treating a ring support prior to the <alfin> process Download PDF

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Publication number
US20040108025A1
US20040108025A1 US10/470,495 US47049503A US2004108025A1 US 20040108025 A1 US20040108025 A1 US 20040108025A1 US 47049503 A US47049503 A US 47049503A US 2004108025 A1 US2004108025 A1 US 2004108025A1
Authority
US
United States
Prior art keywords
ring support
alfin
treating
annealing
support prior
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.)
Abandoned
Application number
US10/470,495
Inventor
Ulrich Bischofberger
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
Assigned to MAHLE GMBH reassignment MAHLE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BISCHOFBERGER, ULRICH
Publication of US20040108025A1 publication Critical patent/US20040108025A1/en
Abandoned 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
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0009—Cylinders, pistons
    • B22D19/0027—Cylinders, pistons pistons
    • 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
    • B22D19/0081—Casting in, on, or around objects which form part of the product pretreatment of the insert, e.g. for enhancing the bonding between insert and surrounding cast metal
    • 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
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0222—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating in a reactive atmosphere, e.g. oxidising or reducing atmosphere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/001—Interlayers, transition pieces for metallurgical bonding of workpieces
    • B23K35/002—Interlayers, transition pieces for metallurgical bonding of workpieces at least one of the workpieces being of light metal
    • 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
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races

Definitions

  • the groove for the first piston ring is generally protected against wear by means of armorings made of austenitic cast iron, which are referred to as ring supports.
  • the invention therefore concerns itself with the problem of producing as oxide-free a surface of the ring support as possible prior to the “alfin” process.
  • Comparable heat treatment methods under a hydrogen atmosphere are known for cold-formed austenitic steels, e.g. for corrugated hoses.
  • a metallically shiny surface is produced by annealing in a vacuum or in a nitrogen atmosphere. The blasting that has been necessary until now can therefore be eliminated.
  • the annealing temperature preferably lies between 1000° C. and 1130° C. A period of 5-20 minutes at temperature is then sufficient. At lower temperatures, in the range of 900° C. to 950° C., the time period at temperature must be extended to as much as 1 hour.
  • the cooling speed after annealing should be at least 2 K/min and is preferably greater than 5 K/min. This prevents decomposition of the surface structure of the ring support, which is usually austenitic.
  • Annealing in a vacuum should take place at as low a pressure as possible, preferably 10 ⁇ 3 to 10 ⁇ 6 mbar.
  • the method can be used not only for uncooled ring supports but also for cooled ring supports, i.e. for ring supports in which direct cooling by motor oil takes place radially within the ring support back, by means of a sheet-metal cooling channel that is welded on.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

The aim of the invention is to provide a ring support that is as oxide-free as possible, prior to being cast-in with piston material. To achieve this, the ring support is annealed in a vacuum or in a hydrogen atmosphere once the ring support has been welded to the sheet steel part.

Description

  • The invention relates to a method for pre-treating a ring support for aluminum pistons prior to the “alfin” process. [0001]
  • In the case of aluminum pistons for diesel engines, the groove for the first piston ring is generally protected against wear by means of armorings made of austenitic cast iron, which are referred to as ring supports. [0002]
  • A good bond between the ring support and the base material of the piston is essential during casting-in. This bond is produced, before production of the piston, by means of a so-called ALFIN layer, a layer of iron aluminides that is formed by dipping the ring support into an AlSi melt. In order for the layer to be formed in optimal manner, and in order for a good bond between the ring support and the aluminum material to be present later, the surface of the iron material must be oxide-free. [0003]
  • It is known to blast the ring support before dipping, in order to remove oxides. However, this method does not always produce satisfactory results.[0004]
  • The invention therefore concerns itself with the problem of producing as oxide-free a surface of the ring support as possible prior to the “alfin” process. [0005]
  • This problem is solved by means of a method according to claim [0006] 1. Advantageous further developments are the object of the dependent claims.
  • Comparable heat treatment methods under a hydrogen atmosphere are known for cold-formed austenitic steels, e.g. for corrugated hoses. [0007]
  • A metallically shiny surface is produced by annealing in a vacuum or in a nitrogen atmosphere. The blasting that has been necessary until now can therefore be eliminated. [0008]
  • The annealing temperature preferably lies between 1000° C. and 1130° C. A period of 5-20 minutes at temperature is then sufficient. At lower temperatures, in the range of 900° C. to 950° C., the time period at temperature must be extended to as much as 1 hour. [0009]
  • The cooling speed after annealing should be at least 2 K/min and is preferably greater than 5 K/min. This prevents decomposition of the surface structure of the ring support, which is usually austenitic. [0010]
  • Annealing in a vacuum should take place at as low a pressure as possible, preferably 10[0011] −3 to 10−6 mbar.
  • Of course, the method can be used not only for uncooled ring supports but also for cooled ring supports, i.e. for ring supports in which direct cooling by motor oil takes place radially within the ring support back, by means of a sheet-metal cooling channel that is welded on. [0012]

Claims (3)

1. Method for pre-treating ring supports for aluminum pistons prior to the “alfin” process,
characterized in that
the ring supports are annealed in a vacuum or in a reducing hydrogen atmosphere, at temperatures between 900° C. and 1130° C.
2. Method according to claim 1,
characterized in that
the annealing takes place over a time period of 5 to 10 minutes.
3. Method according to claim 1 or 2,
characterized in that
after annealing, a cooling speed of >5 K/min is adjusted, in
order to prevent austenite decomposition.
US10/470,495 2001-01-30 2001-12-05 Method for pre-treating a ring support prior to the <alfin> process Abandoned US20040108025A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10103896.8 2001-01-30
DE10103896A DE10103896A1 (en) 2001-01-30 2001-01-30 Process for the pretreatment of a ring carrier before the finishing
PCT/DE2001/004614 WO2002061153A1 (en) 2001-01-30 2001-12-05 Method for pre-treating a ring support prior to the «alfin» process

Publications (1)

Publication Number Publication Date
US20040108025A1 true US20040108025A1 (en) 2004-06-10

Family

ID=7672071

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/470,495 Abandoned US20040108025A1 (en) 2001-01-30 2001-12-05 Method for pre-treating a ring support prior to the <alfin> process

Country Status (5)

Country Link
US (1) US20040108025A1 (en)
EP (1) EP1356125B1 (en)
JP (1) JP2004518025A (en)
DE (2) DE10103896A1 (en)
WO (1) WO2002061153A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100450696C (en) * 2007-03-07 2009-01-14 中国科学院上海光学精密机械研究所 Laser welding method for sealing hollow thin-shell aluminum alloy piston body

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10134293B4 (en) * 2001-07-14 2009-06-04 Mahle Gmbh Cooled ring carrier for a piston
EP1485514A1 (en) * 2002-03-18 2004-12-15 Karl Merz Method and device for the alfin processing of components
DE102005042857A1 (en) 2005-09-08 2007-03-22 Ks Kolbenschmidt Gmbh Piston for an internal combustion engine
DE102009027477A1 (en) * 2009-07-06 2011-01-13 Federal-Mogul Nürnberg GmbH Device for carrying out an alfin process, comprises a vessel with a melting area for the reception of a melt from aluminum or aluminum alloy, and a holding device for a workpiece made of iron or iron alloy to be immersed into the melt
DE102016210061A1 (en) 2016-06-08 2017-12-14 Audi Ag Method for producing a hybrid object comprising at least a first and a second component, which are connected to one another and consist of different metals or metal alloys
DE102020100640A1 (en) 2020-01-14 2021-07-15 Stahlzentrum Freiberg e.V. Process for improving the corrosion resistance of fastening and / or reinforcement components made of high-alloy steels and fastening and / or reinforcement components made of high-alloy steels
CN114457215A (en) * 2021-04-02 2022-05-10 中国科学院金属研究所 Hydrogen reduction treatment method for austenitic steel seamless pipe
DE102022116236A1 (en) 2022-06-29 2024-01-04 Rauschert Heinersdorf - Pressig GmbH COATED COMPONENT, ITS USE, AND METHOD FOR THE PRODUCTION THEREOF

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3485683A (en) * 1966-12-15 1969-12-23 Int Nickel Co Method of heat treating a ductile austenitic ductile iron casting including refrigeration treatment and article produced thereby
US5487922A (en) * 1992-08-14 1996-01-30 Hughes Aircraft Company Surface preparation and deposition method for titanium nitride onto carbon-containing materials
US5960762A (en) * 1996-12-26 1999-10-05 Teikoku Piston Ring Co., Ltd. Piston ring and cylinder liner combination
US6063509A (en) * 1995-10-11 2000-05-16 Mahle Gmbh Reinforcing component of which the basic material is austenitic cast iron
US6112802A (en) * 1995-10-11 2000-09-05 Mahle Gmbh Process for producing an intermetallic join
US6127046A (en) * 1997-12-04 2000-10-03 Cummins Engine Company, Inc. Formation of a graphite-free surface in a ferrous material to produce an improved intermetallic bond

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE743752C (en) * 1936-01-09 1943-12-31 Gottfried Becker Dr Bright annealing process
DE740517C (en) * 1938-08-18 1943-10-22 Siemens Ag Process for the heat treatment of austenitic materials in a tower furnace
CH315894A (en) * 1954-03-16 1956-09-15 Ohio Commw Eng Co Process for obtaining a metal coating
DE4428614C2 (en) * 1994-08-12 1999-07-01 Loi Thermprocess Gmbh Process for annealing metal parts
DE4238525C1 (en) * 1992-11-14 1993-11-18 Man B & W Diesel Ag Cylinder liner with a wear resistant layer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3485683A (en) * 1966-12-15 1969-12-23 Int Nickel Co Method of heat treating a ductile austenitic ductile iron casting including refrigeration treatment and article produced thereby
US5487922A (en) * 1992-08-14 1996-01-30 Hughes Aircraft Company Surface preparation and deposition method for titanium nitride onto carbon-containing materials
US6063509A (en) * 1995-10-11 2000-05-16 Mahle Gmbh Reinforcing component of which the basic material is austenitic cast iron
US6112802A (en) * 1995-10-11 2000-09-05 Mahle Gmbh Process for producing an intermetallic join
US5960762A (en) * 1996-12-26 1999-10-05 Teikoku Piston Ring Co., Ltd. Piston ring and cylinder liner combination
US6127046A (en) * 1997-12-04 2000-10-03 Cummins Engine Company, Inc. Formation of a graphite-free surface in a ferrous material to produce an improved intermetallic bond

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100450696C (en) * 2007-03-07 2009-01-14 中国科学院上海光学精密机械研究所 Laser welding method for sealing hollow thin-shell aluminum alloy piston body

Also Published As

Publication number Publication date
EP1356125A1 (en) 2003-10-29
WO2002061153A1 (en) 2002-08-08
JP2004518025A (en) 2004-06-17
DE50105398D1 (en) 2005-03-24
DE10103896A1 (en) 2002-08-08
EP1356125B1 (en) 2005-02-16

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Legal Events

Date Code Title Description
AS Assignment

Owner name: MAHLE GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BISCHOFBERGER, ULRICH;REEL/FRAME:014823/0907

Effective date: 20030819

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION