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EP0399400A1 - Procédé pour la préparation de produits métalliques frittés ainsi que les produits obtenus - Google Patents

Procédé pour la préparation de produits métalliques frittés ainsi que les produits obtenus Download PDF

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Publication number
EP0399400A1
EP0399400A1 EP90109458A EP90109458A EP0399400A1 EP 0399400 A1 EP0399400 A1 EP 0399400A1 EP 90109458 A EP90109458 A EP 90109458A EP 90109458 A EP90109458 A EP 90109458A EP 0399400 A1 EP0399400 A1 EP 0399400A1
Authority
EP
European Patent Office
Prior art keywords
metallic material
substratum
sintered
product
metallic
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
EP90109458A
Other languages
German (de)
English (en)
Other versions
EP0399400B1 (fr
Inventor
Paolo Luca Antona
Stefano Taricco
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.)
Fiat Auto SpA
Original Assignee
Fiat Auto SpA
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 Fiat Auto SpA filed Critical Fiat Auto SpA
Publication of EP0399400A1 publication Critical patent/EP0399400A1/fr
Application granted granted Critical
Publication of EP0399400B1 publication Critical patent/EP0399400B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—Tappets; Push rods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F3/26—Impregnating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/002—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—Tappets; Push rods
    • F01L1/143—Tappets; Push rods for use with overhead camshafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2301/00—Using particular materials

Definitions

  • the present invention relates to a process to manufacture a sintered metallic product and to the product thus obtained.
  • the aforesaid invention consists of a lifter head for an internal combustion engine.
  • lifter heads consist of a first base material layer which, in use, is joined to a respective shank by means of a conventional operation ( welding, brazing, mechanical junction, etc. ) and of a second layer, bound up with the first layer, which consists of a material so-­called “noble” owing to its particular resistance to the abrasion resulting from the percussion, rolling and slip stresses owing to the cam which, in use, acts upon it.
  • the object of the present invention is to conceive a process and to manufacture a product able to obviate the aforesaid drawbacks of known processes and products .
  • Said object is attained according to the present invention by a process to manufacture a sintered metallic product, characterized by presenting, successively, the following main operations : - to manufacture a sintered substratum consisting of a first metallic material with pores occupied by a second metallic material ; - to lay at least one part of said sintered substratum with a predetermined amount of a third pulverized "noble" metallic material; and - to sinter the predetermined amount of the third material until a required degree of porosity is obtained .
  • a sintered metallic product characterized by comprising : - a sintered substratum which consists of a first metallic material with pores occupied by a second metallic material; and - a filling which consists of a third "noble" metallic material sintered on said substratum .
  • the fusion ( or rather the diffusion and then the fusion ) of the copper powder into the iron matrix enables to obtain a substratum substantially with no porosity whatsoever ; moreover the copper which is in the pores of the iron matrix favours the adhesion of subsequent fillings, according to the description hereinafter .
  • the housing 8 of the substratum 12 is filled with a third "noble" metallic material 13, and particularly able to resist abrasion stresses such as percussion, rolling, slip, etc.
  • the material 13 ( see figure 7 ) is tamped and/or compacted by means of the mould 1 and a countermould 14 and then sintered .
  • the sintering of the "noble" material 13 is carried out so as to control the porosity of the filling 16, in order to be able to impregnate it later with lubricating oil ( according to a conventional method ) and therefore to make it self-lubricating .
  • the product 15 should be used as a lifter head for an internal combustion engine, it would fit all the best service requirements, such as : - a good abrasion resistance of the filling 16, which entirely consists of self-lubricating noble material ; actually this noble material could not migrate into the substratum 12 during the respective sintering , the pores of the matrix 7 being impregnated by the second metallic material . - a strong substratum 12 which can be conveniently joined to a respective support shank; and - no predisposition whatsoever to cracking, thanks to the gradual and simultaneous cooling of the substratum 12 and the filling 16 .
  • the sintered product obtained in accordance with the present invention also permits to make maintenance less frequent .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Composite Materials (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
EP90109458A 1989-05-26 1990-05-18 Procédé pour la préparation de produits métalliques frittés ainsi que les produits obtenus Expired - Lifetime EP0399400B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6740189 1989-05-26
IT8967401A IT1233589B (it) 1989-05-26 1989-05-26 Procedimento per realizzare un manufatto metallico sinterizzato e manufatto cosi ottenuto

Publications (2)

Publication Number Publication Date
EP0399400A1 true EP0399400A1 (fr) 1990-11-28
EP0399400B1 EP0399400B1 (fr) 1995-11-02

Family

ID=11302084

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90109458A Expired - Lifetime EP0399400B1 (fr) 1989-05-26 1990-05-18 Procédé pour la préparation de produits métalliques frittés ainsi que les produits obtenus

Country Status (4)

Country Link
EP (1) EP0399400B1 (fr)
BR (1) BR9002490A (fr)
DE (1) DE69023271T2 (fr)
IT (1) IT1233589B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0698727A1 (fr) * 1994-08-24 1996-02-28 Fuji Oozx Inc. Méthode de fabrication d'un poussoir pour moteur à combustion interne
EP0703350A1 (fr) * 1994-09-21 1996-03-27 Fuji Oozx Inc. Poussoir de moteur à combustion interne et méthode de fabrication

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020109187A1 (de) 2020-04-02 2021-10-07 Schaeffler Technologies AG & Co. KG Rollenstößel für eine Pumpe und Verfahren zur Herstellung eines Hubübertragungsteils

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB544903A (en) * 1940-02-01 1942-05-01 Gen Motors Corp Improvements in methods of making composite metallic articles
GB960479A (en) * 1960-11-09 1964-06-10 Varta Ag Method of producing catalytic electrodes
GB1106864A (en) * 1964-04-29 1968-03-20 Philips Electronic Associated Improvements in the manufacturing of porous refractory bodies
WO1983004382A1 (fr) * 1982-06-10 1983-12-22 Ford Motor Company Limited Procede de fabrication de pieces a base de fer et resistant a l'usure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB544903A (en) * 1940-02-01 1942-05-01 Gen Motors Corp Improvements in methods of making composite metallic articles
GB960479A (en) * 1960-11-09 1964-06-10 Varta Ag Method of producing catalytic electrodes
GB1106864A (en) * 1964-04-29 1968-03-20 Philips Electronic Associated Improvements in the manufacturing of porous refractory bodies
WO1983004382A1 (fr) * 1982-06-10 1983-12-22 Ford Motor Company Limited Procede de fabrication de pieces a base de fer et resistant a l'usure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0698727A1 (fr) * 1994-08-24 1996-02-28 Fuji Oozx Inc. Méthode de fabrication d'un poussoir pour moteur à combustion interne
EP0703350A1 (fr) * 1994-09-21 1996-03-27 Fuji Oozx Inc. Poussoir de moteur à combustion interne et méthode de fabrication

Also Published As

Publication number Publication date
IT8967401A0 (it) 1989-05-26
EP0399400B1 (fr) 1995-11-02
DE69023271D1 (de) 1995-12-07
DE69023271T2 (de) 1996-04-25
BR9002490A (pt) 1991-11-12
IT1233589B (it) 1992-04-06

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