GB1242713A - A method of producing case-hardened toothed gears - Google Patents

A method of producing case-hardened toothed gears

Info

Publication number
GB1242713A
GB1242713A GB2410368A GB2410368A GB1242713A GB 1242713 A GB1242713 A GB 1242713A GB 2410368 A GB2410368 A GB 2410368A GB 2410368 A GB2410368 A GB 2410368A GB 1242713 A GB1242713 A GB 1242713A
Authority
GB
United Kingdom
Prior art keywords
gear
freeze
layer
hardened
carbon
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.)
Expired
Application number
GB2410368A
Inventor
Walter Thomas Chesters
Geoffrey Parrish
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.)
BROWN GEAR IND
David Brown Gear Industries Ltd
Original Assignee
BROWN GEAR IND
David Brown Gear Industries Ltd
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 BROWN GEAR IND, David Brown Gear Industries Ltd filed Critical BROWN GEAR IND
Priority to GB2410368A priority Critical patent/GB1242713A/en
Publication of GB1242713A publication Critical patent/GB1242713A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/20—Carburising
    • C23C8/22—Carburising of ferrous surfaces
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/04—Hardening by cooling below 0 degrees Celsius
    • 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
    • C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
    • 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
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/80—After-treatment
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/001—Heat treatment of ferrous alloys containing Ni

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical 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)

Abstract

1,242,713. Carburizing and heat-treating gears. DAVID BROWN GEAR INDUSTRIES Ltd. May 20, 1969 [May 21, 1968], No.24103/68. Headings C7A and C7U. [Also in Division B3] A case-hardened toothed gear is made by forming a gear with a small surplus of metal on its tooth flanks from a steel containing one or more non- carbide forming elements such that it is rendered freeze-hardenable when its carbon content is increased above a level dependent upon the quantity of non-carbide forming elements present. The gear is then carburized, preferably gas-carburized at 925‹ C., to form a carbon gradient such that there is formed on cooling to room temperature, preferably at a rate of 1-20‹C. per second at 700‹C., an outer soft austenitic layer underlaid by a harder layer containing some austerite surrounding a soft core, the soft outer layer being thicker than the surplus metal. Finally the gear is cooled to room temperature, the surplus metal is removed and the gear freeze-hardened, preferably in CO 2 slush at -60 to -80‹C., to form a martensitic layer in the case. The gear is preferably tempered at 150 to 250‹C. after the freeze-hardening. The steel used preferably contains up to 0À21%, e.g. 0À1%, carbon and 5% to 10% nickel and a gear blank may be doublenormalized and tempered before forming the gear.
GB2410368A 1968-05-21 1968-05-21 A method of producing case-hardened toothed gears Expired GB1242713A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2410368A GB1242713A (en) 1968-05-21 1968-05-21 A method of producing case-hardened toothed gears

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2410368A GB1242713A (en) 1968-05-21 1968-05-21 A method of producing case-hardened toothed gears

Publications (1)

Publication Number Publication Date
GB1242713A true GB1242713A (en) 1971-08-11

Family

ID=10206419

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2410368A Expired GB1242713A (en) 1968-05-21 1968-05-21 A method of producing case-hardened toothed gears

Country Status (1)

Country Link
GB (1) GB1242713A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4761867A (en) * 1987-02-12 1988-08-09 Eaton Corporation Method for producing ring gears for heavy-duty drive axles
US4856167A (en) * 1987-02-12 1989-08-15 Eaton Corporation Method for producing near net ring gear forgings

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4761867A (en) * 1987-02-12 1988-08-09 Eaton Corporation Method for producing ring gears for heavy-duty drive axles
US4856167A (en) * 1987-02-12 1989-08-15 Eaton Corporation Method for producing near net ring gear forgings

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees