JPS5531102A - Partially hardening method - Google Patents

Partially hardening method

Info

Publication number
JPS5531102A
JPS5531102A JP5347878A JP5347878A JPS5531102A JP S5531102 A JPS5531102 A JP S5531102A JP 5347878 A JP5347878 A JP 5347878A JP 5347878 A JP5347878 A JP 5347878A JP S5531102 A JPS5531102 A JP S5531102A
Authority
JP
Japan
Prior art keywords
works
hardening
hardnesses
sprayed
rings
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.)
Pending
Application number
JP5347878A
Other languages
Japanese (ja)
Inventor
Yasuo Fujioka
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.)
NTN Corp
Original Assignee
NTN Toyo Bearing Co 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 NTN Toyo Bearing Co Ltd filed Critical NTN Toyo Bearing Co Ltd
Priority to JP5347878A priority Critical patent/JPS5531102A/en
Publication of JPS5531102A publication Critical patent/JPS5531102A/en
Pending 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
    • C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races

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)

Abstract

PURPOSE:To inspect easily and cheaply the hardness distribution of the partially hardened part of each circular work by uniformly heating circular works laid in two layers to a predetermined hardening temp.; hardening them after being set between protective rings; and measuring the end hardnesses of each of the hardened works to nondestructively judge the hardnesses of the hardened part and the hardening depth. CONSTITUTION:Circular works 1, 1 such as bearing track rings are laid in two layers, uniformly heated in an electric furnace, and set between protective rings so that a coolant is not sprayed upon one edge of each work 1. The coolant such as a mist of water or flon gas is first sprayed upon the outer circumference parts of works 1 from mist generation nozzle 6, and then the inner circumference parts are sprayed with a liquid coolant fed through inner circumference jet 5. After detaching rings 2 works 1 are cooled to room temp. to finish hardening. By measuring the hardnesses of ends A, B, C with a Rockwell hardness tester or the like the hardness of the outer circumference part of each work 1, that of the inner circumference part and the hardening depth are judged from parts A, C and B, respectively.
JP5347878A 1978-05-04 1978-05-04 Partially hardening method Pending JPS5531102A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5347878A JPS5531102A (en) 1978-05-04 1978-05-04 Partially hardening method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5347878A JPS5531102A (en) 1978-05-04 1978-05-04 Partially hardening method

Publications (1)

Publication Number Publication Date
JPS5531102A true JPS5531102A (en) 1980-03-05

Family

ID=12943947

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5347878A Pending JPS5531102A (en) 1978-05-04 1978-05-04 Partially hardening method

Country Status (1)

Country Link
JP (1) JPS5531102A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58110619A (en) * 1981-12-24 1983-07-01 Osaka Bearing Seizo Kk Partial hardening method for annular steel parts
JPS6086066A (en) * 1983-10-18 1985-05-15 奥多摩工業株式会社 Manufacture of plate-like calcium hydroxide
JPS61235509A (en) * 1985-09-07 1986-10-20 Daibea Kk Partial hardening device for annular steel parts
US4737202A (en) * 1985-09-19 1988-04-12 M A N Nutzfahrzeuge Gmbh Method of producing steel components that simultaneously have high strength and high ductility and which retain these properties even after a hot forming operation
KR100781188B1 (en) 2006-06-23 2007-11-30 삼영기계(주) Heating processing method for surface of piston ring and a piston ring
KR100935113B1 (en) * 2009-06-26 2010-01-06 주식회사 평산 Rapid air cooling apparatus for heat treatment
KR100935112B1 (en) * 2008-08-12 2010-01-08 주식회사 평산 Rapid water cooling apparatus for heat treatment
WO2010018925A3 (en) * 2008-08-12 2010-04-15 (주) 평산 Rapid water cooling apparatus for hollow tube-shaped heat‑treated objects
JP2012136744A (en) * 2010-12-27 2012-07-19 Nsk Ltd Method for quenching annular body using continuous quenching furnace
CN104357624A (en) * 2014-11-26 2015-02-18 宁夏机械研究院股份有限公司 Railway bearing inner race mold retaining quenching device

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58110619A (en) * 1981-12-24 1983-07-01 Osaka Bearing Seizo Kk Partial hardening method for annular steel parts
JPH0122328B2 (en) * 1981-12-24 1989-04-26 Oosaka Bearingu Seizo Kk
JPS6086066A (en) * 1983-10-18 1985-05-15 奥多摩工業株式会社 Manufacture of plate-like calcium hydroxide
JPS61235509A (en) * 1985-09-07 1986-10-20 Daibea Kk Partial hardening device for annular steel parts
JPH0123529B2 (en) * 1985-09-07 1989-05-02 Oosaka Bearingu Seizo Kk
US4737202A (en) * 1985-09-19 1988-04-12 M A N Nutzfahrzeuge Gmbh Method of producing steel components that simultaneously have high strength and high ductility and which retain these properties even after a hot forming operation
KR100781188B1 (en) 2006-06-23 2007-11-30 삼영기계(주) Heating processing method for surface of piston ring and a piston ring
KR100935112B1 (en) * 2008-08-12 2010-01-08 주식회사 평산 Rapid water cooling apparatus for heat treatment
WO2010018925A3 (en) * 2008-08-12 2010-04-15 (주) 평산 Rapid water cooling apparatus for hollow tube-shaped heat‑treated objects
KR100935113B1 (en) * 2009-06-26 2010-01-06 주식회사 평산 Rapid air cooling apparatus for heat treatment
WO2010150935A1 (en) * 2009-06-26 2010-12-29 (주) 평산 Rapid air cooling device for hollow pipe-shaped heat-treated product
JP2012136744A (en) * 2010-12-27 2012-07-19 Nsk Ltd Method for quenching annular body using continuous quenching furnace
CN104357624A (en) * 2014-11-26 2015-02-18 宁夏机械研究院股份有限公司 Railway bearing inner race mold retaining quenching device

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