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JPS57152419A - Production of valve seat for cylinder head made of cast iron - Google Patents

Production of valve seat for cylinder head made of cast iron

Info

Publication number
JPS57152419A
JPS57152419A JP3524281A JP3524281A JPS57152419A JP S57152419 A JPS57152419 A JP S57152419A JP 3524281 A JP3524281 A JP 3524281A JP 3524281 A JP3524281 A JP 3524281A JP S57152419 A JPS57152419 A JP S57152419A
Authority
JP
Japan
Prior art keywords
hardening
valve seat
cast iron
cylinder head
irradiation
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
JP3524281A
Other languages
Japanese (ja)
Inventor
Takashi Yanagisawa
Minoru Uchino
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.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor 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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP3524281A priority Critical patent/JPS57152419A/en
Publication of JPS57152419A publication Critical patent/JPS57152419A/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
    • 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)

Abstract

PURPOSE:To eliminate the need for reworking with virtually no generation of strains after hardening and to permit sufficient hardening with air cooling by using laser beam irradiation in a hardening treatment for the surface of a valve seat for cylinder heads made of cast iron. CONSTITUTION:A hardening surface treatment using laser beam irradiation is applied on the surface 2 of a valve seat against which the suction and discharge valve of a cylinder head 1 collides, whereby a surface-hardened layer is formed, and a valve seat part 3 is constituted. This hardening is accomplished by using, for example, a CO2 laser device 4, disposing the device 4 with inclination to the central axis of the valve port in such a way that the beam 5 thereof is made incident to the seat surface 2 at an optimum angle and rotating this one turn in an arrow direction. The surface 2 irradiated by the beam 5 is quickly heated and the range of the irradiation can be considerably narrowed; therefore, when the beam 5 passes therethrough, the irradiated part is quickly cooled by the thermal diffusion and has extremely high hardness by causing martensite transformation.
JP3524281A 1981-03-13 1981-03-13 Production of valve seat for cylinder head made of cast iron Pending JPS57152419A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3524281A JPS57152419A (en) 1981-03-13 1981-03-13 Production of valve seat for cylinder head made of cast iron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3524281A JPS57152419A (en) 1981-03-13 1981-03-13 Production of valve seat for cylinder head made of cast iron

Publications (1)

Publication Number Publication Date
JPS57152419A true JPS57152419A (en) 1982-09-20

Family

ID=12436363

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3524281A Pending JPS57152419A (en) 1981-03-13 1981-03-13 Production of valve seat for cylinder head made of cast iron

Country Status (1)

Country Link
JP (1) JPS57152419A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101967551A (en) * 2010-09-18 2011-02-09 中国兵器工业集团第七○研究所 Laser strengthening device and strengthening method for valve seat ring of cylinder head
CN102199698A (en) * 2010-03-25 2011-09-28 中国科学院力学研究所 Laser reinforcing process for valve seat of cylinder head
CN102719648A (en) * 2012-07-12 2012-10-10 中南大学 Thermal treatment method and device for metal sheets
JP2016200042A (en) * 2015-04-09 2016-12-01 日産自動車株式会社 engine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102199698A (en) * 2010-03-25 2011-09-28 中国科学院力学研究所 Laser reinforcing process for valve seat of cylinder head
CN101967551A (en) * 2010-09-18 2011-02-09 中国兵器工业集团第七○研究所 Laser strengthening device and strengthening method for valve seat ring of cylinder head
CN102719648A (en) * 2012-07-12 2012-10-10 中南大学 Thermal treatment method and device for metal sheets
JP2016200042A (en) * 2015-04-09 2016-12-01 日産自動車株式会社 engine

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