US3578512A - Method of heat treatment of a steel product - Google Patents

Method of heat treatment of a steel product Download PDF

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Publication number
US3578512A
US3578512A US730120A US3578512DA US3578512A US 3578512 A US3578512 A US 3578512A US 730120 A US730120 A US 730120A US 3578512D A US3578512D A US 3578512DA US 3578512 A US3578512 A US 3578512A
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United States
Prior art keywords
portions
heat
hardness
groove
steel product
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Expired - Lifetime
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US730120A
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English (en)
Inventor
Shinnosuke Funakubo
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Funakubo Seikyo KK
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Funakubo Seikyo KK
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Publication date
Application filed by Funakubo Seikyo KK filed Critical Funakubo Seikyo KK
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Publication of US3578512A publication Critical patent/US3578512A/en
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    • 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
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
    • C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • ABSTRACT OF THE DISCLOSURE A method of heat-treating and hardening a steel product such as a toothed wheel and similar structural elements, requiring a hardness and abrasion resistance on portions of its working surfaces increased in comparison to the hardness and abrasion resistance of the remaining portions comprising the steps of providing on the surface of said product at least one groove separating the said surfaces of portions of required increased hardness from the remaining surfaces; locally heat-treating the said portions of the surfaces requiring an increased hardness as they are divided by said at least one groove and subsequently hardening by quenching the heat-treated portions leaving the remaining portions with its original hardness and abrasion resistance.
  • the present invention relates to a method of heat treatment of a steel product, particularly working parts of machines such as a toothed wheel.
  • toothed wheels and other steel working parts of machines are essentially required to be hardened extremely and locally at their working portion such as a tooth portion of a toothed wheel, and are to retain toughness at their other bottom or central portions.
  • the conventional hardening for satisfying the above requirement, has been conducted in the way that for example, a heated chisel is cooled locally at a predetermined hardening portion with a quenching agent, and after that, tempered at said portion with excess heat other portions remaining not cooled.
  • the methol is applicable to chisels and tools, the hardening portions of which are straight, but not to toothed wheels, the hardening portions of which extend radially.
  • a flamehardening or high-frequency hardening has been employed for casehardening around their working surfaces. This method is difficult to use in the surfaces locally and limitedly.
  • An object of the present invention is, hence, to provide a method of heat treatment of a steel product, particularly a toothed wheel and other structural elements of machines, having predetermined hardening portions capable of heating and hardening locally and limitedly with other portion remained unhardened and reducing to the minimum the probability of distortion which has been encountered on heated products of the prior art.
  • the principle of the present invention is, therefore, to provide a method of heat treatment of a steel product, such as a toothed wheel and similar structural elements, which comprises providing one or more grooves between the portions to be hardened and other portions not to be hardened, and subjecting said firstly-mentioned portion "ice to a heating atmosphere.
  • the heat applied to said firstlymentioned portion is hindered from transmission to said secondly-mentioned portion, because of the existence of said grooves, and said secondly-mentioned portion remains unaffected by the 'heat treatment.
  • FIG. 1 shows a plan view of a toothed wheel provided with a heat transmission inhibiting groove of the present invention to be treated by a heating method of the present invention
  • FIG. 2 shows a sectional view taken along the line IIII of FIG. 1;
  • FIG. 3 is an explanatory diagram showing a transmission of heat applied to the. toothed wheel from the direction of a projected portion, to be hardened and
  • FIG. 4 is a partial view in perspective showing another embodiment of the toothed wheel treated by the heating method of the present invention.
  • a toothed wheel 1 having a number of teeth 2 provided with a hole 4 for a central axis.
  • a circular groove 3 is provided around the outer periphery of the portion to be hardened and at a certain distance therefrom.
  • the groove 3 serves to prevent transmission of the heat applied to the tooth portion in the direction of the centre of axis, but this premise is not clear. In heating by a high-frequency electromagnetic field, the groove 3 seems to work to cut off line of magnetic force.
  • said toothed wheel is hardened only at the tooth portion, but remains unhardened at the portion nearer to the axis or the basic portion.
  • plural grooves 3 are provided radially inwardly of the teeth of the toothed wheel and extending in the axial direction thereof.
  • the most efficient groove therefore has a depth which does not interfere with maintaining the basic portion confined by the groove at a temperature below the transformation point of the toothed wheel, if the temperature aroundthe tooth portion reaches to the transformation point.
  • a method of heat treatment and hardening of a steel product to provide it with a hardened working portion having a working surface and a remaining portion with its original hardness, such as a toothed wheel and similar structural elements which comprises the steps of providing at least one groove in the surface of said product, between the said working portion to be hardened and the remaining portion, which is not to be hardened;

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  • 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)
US730120A 1967-05-25 1968-05-17 Method of heat treatment of a steel product Expired - Lifetime US3578512A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3278967 1967-05-25

Publications (1)

Publication Number Publication Date
US3578512A true US3578512A (en) 1971-05-11

Family

ID=12368601

Family Applications (1)

Application Number Title Priority Date Filing Date
US730120A Expired - Lifetime US3578512A (en) 1967-05-25 1968-05-17 Method of heat treatment of a steel product

Country Status (4)

Country Link
US (1) US3578512A (fr)
DE (1) DE1758390A1 (fr)
FR (1) FR1563575A (fr)
GB (1) GB1208927A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4323404A (en) * 1980-05-07 1982-04-06 The Japan Steel Works Ltd. Method for providing single piece with plural different mechanical characteristics
US4814026A (en) * 1987-02-03 1989-03-21 Ford Motor Company Method of producing composite welded components

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4323404A (en) * 1980-05-07 1982-04-06 The Japan Steel Works Ltd. Method for providing single piece with plural different mechanical characteristics
US4814026A (en) * 1987-02-03 1989-03-21 Ford Motor Company Method of producing composite welded components

Also Published As

Publication number Publication date
GB1208927A (en) 1970-10-14
DE1758390A1 (de) 1971-01-28
FR1563575A (fr) 1969-04-11

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