GB2004919A - Methods of producing surfaces hardened by remelting hardening - Google Patents

Methods of producing surfaces hardened by remelting hardening

Info

Publication number
GB2004919A
GB2004919A GB7836869A GB7836869A GB2004919A GB 2004919 A GB2004919 A GB 2004919A GB 7836869 A GB7836869 A GB 7836869A GB 7836869 A GB7836869 A GB 7836869A GB 2004919 A GB2004919 A GB 2004919A
Authority
GB
United Kingdom
Prior art keywords
porosity
oxygen
localised
methods
remelting
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
GB7836869A
Other versions
GB2004919B (en
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.)
Audi AG
Original Assignee
Audi NSU Auto Union AG
Audi AG
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 Audi NSU Auto Union AG, Audi AG filed Critical Audi NSU Auto Union AG
Publication of GB2004919A publication Critical patent/GB2004919A/en
Application granted granted Critical
Publication of GB2004919B publication Critical patent/GB2004919B/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C21D9/30—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for crankshafts; for camshafts
    • 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
    • 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
    • C21D5/00—Heat treatments of cast-iron

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Gears, Cams (AREA)

Abstract

Surface hardening of a cast iron component involving localised remelting is carried out under a protective gas shield by localised heating along melting tracks. Adjustment of the quantity of oxygen accumulated at the surface being hardened yields a desired surface density of the porosity of that surface, and the extent of overlapping of the melting tracks results in a desired pore fineness. Oil emulsion applied upon machining prevents oxygen absorption leading to low surface porosity. Conversely heating in the presence of air or oxygen leads to oxygen absorption and hence high surface porosity. <IMAGE>
GB7836869A 1977-09-15 1978-09-14 Method of producing surfaces hardened by remelting hardening Expired GB2004919B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2741567A DE2741567C2 (en) 1977-09-15 1977-09-15 Process for producing remelt hardening hardened surfaces

Publications (2)

Publication Number Publication Date
GB2004919A true GB2004919A (en) 1979-04-11
GB2004919B GB2004919B (en) 1982-01-13

Family

ID=6019038

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7836869A Expired GB2004919B (en) 1977-09-15 1978-09-14 Method of producing surfaces hardened by remelting hardening

Country Status (5)

Country Link
JP (1) JPS5461011A (en)
DE (1) DE2741567C2 (en)
FR (1) FR2403392A1 (en)
GB (1) GB2004919B (en)
IT (1) IT1099077B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1980002434A1 (en) * 1979-05-07 1980-11-13 Commw Scient Ind Res Org Surface hardening of metals by electric arc discharge
GB2131458A (en) * 1982-12-09 1984-06-20 Zentralinstitut Schweiss A method for local treatment by melting
GB2155498A (en) * 1984-03-07 1985-09-25 Honda Motor Co Ltd Method and apparatus for remelting and hardening an elongate workpiece
GB2169318A (en) * 1985-01-04 1986-07-09 Rolls Royce Metal surface hardening by carbide formation
US4661676A (en) * 1985-03-01 1987-04-28 Toyota Jidosha Kabushiki Kaisha Process for producing camshaft with cams subjected to remelting chilling treatment
GB2183255A (en) * 1985-10-21 1987-06-03 Honda Motor Co Ltd Local remelting and resolidification
GB2376433A (en) * 2001-06-14 2002-12-18 Federal Mogul Camshaft Casting Manufacturing camshafts

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2933056C2 (en) * 1978-11-27 1983-06-30 Bachofen AG, 8610 Uster Coupling device for releasably connecting the mouth of a branch line to a supply line carrying a pressure medium
JPS57163140A (en) * 1981-04-02 1982-10-07 Nippon Piston Ring Co Ltd Piston ring
JPS5974296U (en) * 1982-11-09 1984-05-19 ミサワホ−ム株式合社 Satsushi with integrated ventilation frame
JPS6233720A (en) * 1985-08-08 1987-02-13 Toyota Motor Corp Production of chilled cam shaft by remelting
FR2663647A1 (en) * 1990-06-22 1991-12-27 Peugeot Cam possessing a peripheral surface which is treated and hardened in order to be wear resistant, and shaft fitted with at least one such cam

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2763583A (en) * 1953-03-26 1956-09-18 Kawasaki Sozo Process for manufacturing porous cast iron
JPS5149573B2 (en) * 1971-09-09 1976-12-27

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1980002434A1 (en) * 1979-05-07 1980-11-13 Commw Scient Ind Res Org Surface hardening of metals by electric arc discharge
GB2131458A (en) * 1982-12-09 1984-06-20 Zentralinstitut Schweiss A method for local treatment by melting
GB2155498A (en) * 1984-03-07 1985-09-25 Honda Motor Co Ltd Method and apparatus for remelting and hardening an elongate workpiece
US4761192A (en) * 1984-03-07 1988-08-02 Honda Giken Kogyo Kabushiki Kaisha Method of and apparatus for remelting and hardening a shaft
GB2169318A (en) * 1985-01-04 1986-07-09 Rolls Royce Metal surface hardening by carbide formation
US4698237A (en) * 1985-01-04 1987-10-06 Rolls-Royce Plc Metal surface hardening by carbide formation
US4661676A (en) * 1985-03-01 1987-04-28 Toyota Jidosha Kabushiki Kaisha Process for producing camshaft with cams subjected to remelting chilling treatment
GB2183255A (en) * 1985-10-21 1987-06-03 Honda Motor Co Ltd Local remelting and resolidification
GB2183255B (en) * 1985-10-21 1989-09-20 Honda Motor Co Ltd Methods for enhancing the abrasion resistance of alloy components
GB2376433A (en) * 2001-06-14 2002-12-18 Federal Mogul Camshaft Casting Manufacturing camshafts

Also Published As

Publication number Publication date
FR2403392A1 (en) 1979-04-13
JPS5461011A (en) 1979-05-17
IT7827683A0 (en) 1978-09-14
JPS576494B2 (en) 1982-02-05
GB2004919B (en) 1982-01-13
DE2741567C2 (en) 1981-09-24
DE2741567A1 (en) 1979-03-29
IT1099077B (en) 1985-09-18

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19950914