GB965192A - Improvements in or relating to gears - Google Patents

Improvements in or relating to gears

Info

Publication number
GB965192A
GB965192A GB7320/63A GB732063A GB965192A GB 965192 A GB965192 A GB 965192A GB 7320/63 A GB7320/63 A GB 7320/63A GB 732063 A GB732063 A GB 732063A GB 965192 A GB965192 A GB 965192A
Authority
GB
United Kingdom
Prior art keywords
hours
blank
teeth
gears
carried out
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
GB7320/63A
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.)
LA TECHNIQUE INTEGRALE
Original Assignee
LA TECHNIQUE INTEGRALE
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 LA TECHNIQUE INTEGRALE filed Critical LA TECHNIQUE INTEGRALE
Publication of GB965192A publication Critical patent/GB965192A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23F—MAKING GEARS OR TOOTHED RACKS
    • B23F17/00—Special methods or machines for making gear teeth, not covered by the preceding groups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P25/00—Auxiliary treatment of workpieces, before or during machining operations, to facilitate the action of the tool or the attainment of a desired final condition of the work, e.g. relief of internal stress
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

A method of making hardened gears of austeno-martensitic stainless steel is charaterized in that a blank is completely hardened, then tempered, the gear teeth are then cut and the gear is finally heat treated. Internally toothed annuli, internally or externally toothed annular helical gears, and bevel, spiral bevel or hypoid annular gears may be made by the method. An oversize blank of a stainless steel having 15-17% chromium, 3-4% nickel and 2.5-4% molybdenum and not more than 0.2% carbon is first prepared. The blank is then hardened by heating for thirty minutes at 960 DEG C., cooling for two hours at -80 DEG C. and age hardening for two hours at 400 DEG C. An additional tempering for two hours at 580-620 DEG C. is then carried out. The blank is then reduced on a lathe or grinding machine to the dimensions contemplated for cutting the teeth. The teeth are then cut by, for example, a Fellous machine. The complete part is then given a hard chromium electrolytic plating of a thickness of from 0.00012-0.0002 inch. The gear is then heated for thirty minutes at 960 DEG C., cooled for two hours at -80 DEG C. and heated for two hours at 400 DEG C. The part is then sand-blasted and the chromium plating removed electrolytically and a dehydrogenization treatment is carried out. Grinding may then be carried out with a corresponding pinion and rectification of centres with respect to the teeth may be made. Final electrolytic polishing and passivation steps are then effected.
GB7320/63A 1962-02-23 1963-02-22 Improvements in or relating to gears Expired GB965192A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR888971A FR1323588A (en) 1962-02-23 1962-02-23 Process for manufacturing age hardening austeno-martensitic stainless steel gears

Publications (1)

Publication Number Publication Date
GB965192A true GB965192A (en) 1964-07-29

Family

ID=8773338

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7320/63A Expired GB965192A (en) 1962-02-23 1963-02-22 Improvements in or relating to gears

Country Status (3)

Country Link
CH (1) CH405884A (en)
FR (1) FR1323588A (en)
GB (1) GB965192A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2305272A1 (en) * 1975-03-25 1976-10-22 Ntn Toyo Bearing Co Ltd PROCESS FOR WORKING STEEL WORKPIECES INCLUDING MACHINING DURING QUENCH COOLING
EP0633078A1 (en) * 1993-07-10 1995-01-11 Leifeld GmbH & Co. Method of fabricating a hollow steel body with an inner- and/or outer profiling

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2685921B1 (en) * 1992-01-08 1994-09-16 Creusot Loire METHOD FOR MANUFACTURING A LARGE DOTTED CROWN, AND DOTTED CROWN OBTAINED.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2305272A1 (en) * 1975-03-25 1976-10-22 Ntn Toyo Bearing Co Ltd PROCESS FOR WORKING STEEL WORKPIECES INCLUDING MACHINING DURING QUENCH COOLING
EP0633078A1 (en) * 1993-07-10 1995-01-11 Leifeld GmbH & Co. Method of fabricating a hollow steel body with an inner- and/or outer profiling

Also Published As

Publication number Publication date
CH405884A (en) 1966-01-15
FR1323588A (en) 1963-04-12

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