US3622407A - Method for electrical induction, heat treatment for railroad switches (rail tongues, crossings, wing rails) - Google Patents

Method for electrical induction, heat treatment for railroad switches (rail tongues, crossings, wing rails) Download PDF

Info

Publication number
US3622407A
US3622407A US741166A US3622407DA US3622407A US 3622407 A US3622407 A US 3622407A US 741166 A US741166 A US 741166A US 3622407D A US3622407D A US 3622407DA US 3622407 A US3622407 A US 3622407A
Authority
US
United States
Prior art keywords
rail
component
heated
crossings
method defined
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 - Lifetime
Application number
US741166A
Other languages
English (en)
Inventor
Grigore Niculescu
Traian Ghimbasean
Eugen Dumitrescu
Nicolae Ionescu
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.)
INST CERCETARI TEHNOLOGICE PEN
Original Assignee
INST CERCETARI TEHNOLOGICE PEN
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 INST CERCETARI TEHNOLOGICE PEN filed Critical INST CERCETARI TEHNOLOGICE PEN
Application granted granted Critical
Publication of US3622407A publication Critical patent/US3622407A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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

  • railroad switches are made of high alloy steel. Such compositions necessitate the laborious and very expensive production of the alloy with use of extremely expensive metals such as vanadium, chromium, manganese and molybdenum. Otherwise the railroad-switch components are simply made from surface-hardened steel. This surface hardening has generally been carried out heretofore with the use of a system of burners through which the rail components are moved.
  • the amount of heat to which the component is subjected in the above-mentioned method is controlled either by varying the fuel fiow according to the cross section, or by varying the speed of the component as it passes through the system. Obviously, such a method is cumbersome and lacks efficiency.
  • This object is attained according to the main feature of our invention by heating the components through thermoelectric induction and rendered easy by fitting a nonmagnetic metal body (i.e.) relatively low magnetic permeability) to the body to be treated.
  • a nonmagnetic metal body i.e.
  • relatively low magnetic permeability i.e.
  • the nonmagnetic body is preferably made of copper and serves to distribute the eddy currents between itself and the steel body, thereby preventing overheating even if the steel body has relatively thin portions; however due to its nonmagnetic properties, the copper body does not uselessly absorb electrical energy. It is of course reusable.
  • This method makes for easy surface hardening of irregularly shaped pieces of steel with a minimum of equipment, the method being easily incorporated into the production line of a rolling mill.
  • the finished product has a service life some 3 to times greater than the conventional components, and offers extremely strong bow-shaped hardened layers on all upper surfaces, unfissured and undamaged by flame.
  • FIG. I shows a plant, in diagrammatic perspective view, for carrying out the method of my invention.
  • FIG. 2 is a cross section through a portion of the plant of FIG. 1.
  • an AC generator I producing a constant energy of 250 kw. at 2,500 Hz. is connected to a transformer 3.
  • a capacitor 2 or bank of capacitors connected across the input winding of this transformer 3 compensates for the wattless component of the generator 1.
  • the output winding of this transformer 3 is connected to an inductor loop 4 or one of a plurality of loop stages located above a surface-hardening ath.
  • a rail 5 having a rail tongue 5a is moved along this path at a constant speed in the direction of an arrow A along with a copper compensating body 6 complementarily fitting the tongue 5a and lying thereagainst although illustrated with a slight spacing therefrom.
  • a nozzle 7 Downstream of the inductor 4 is a nozzle 7 for the airatomized spraying of water on the rail 5. Yet further downstream is a sprayer 8 which can prevent or interrupt the tempering process as desired through controlled quenching of the rail 5. At the further downstream end is a second inductor 9 connected to a transformer 10 for heating the bottom of the rail 5 to prevent the same from bowing.
  • the surface hardening is carried out as follows:
  • the flux in the direction I, in the inductor 4 flows in directions I and L, in the tongue 5a and the body 6 respectively.
  • the finished product here has a surface hardness of up to 45-50 on the Rockwell scale, and is found to have bow-shaped heat-treated zones of a thickness of 9-11 mm.
  • the ultimate tensile strength of the heat-treated layer is more than kp/mmF.
  • a method of heat treating an elongated iron body of nonuniform cross section to surface harden it comprising the steps of:

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)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
US741166A 1967-06-29 1968-06-28 Method for electrical induction, heat treatment for railroad switches (rail tongues, crossings, wing rails) Expired - Lifetime US3622407A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RO5415867 1967-06-29

Publications (1)

Publication Number Publication Date
US3622407A true US3622407A (en) 1971-11-23

Family

ID=20086601

Family Applications (1)

Application Number Title Priority Date Filing Date
US741166A Expired - Lifetime US3622407A (en) 1967-06-29 1968-06-28 Method for electrical induction, heat treatment for railroad switches (rail tongues, crossings, wing rails)

Country Status (6)

Country Link
US (1) US3622407A (en:Method)
AT (1) AT294878B (en:Method)
BE (1) BE717328A (en:Method)
DE (1) DE1758517B1 (en:Method)
FR (1) FR1583991A (en:Method)
GB (1) GB1228382A (en:Method)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4375995A (en) * 1978-05-12 1983-03-08 Nippon Steel Corporation Method for manufacturing high strength rail of excellent weldability
US4899570A (en) * 1988-04-05 1990-02-13 Teledyne Industries, Inc. Apparatus and method of rotary forging with induction heating
CN102505589A (zh) * 2011-11-02 2012-06-20 中铁上海工程局有限公司 便携式钢轨焊接接头中高频电感应加热正火装置和方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2541978C3 (de) * 1975-09-20 1978-08-24 Butzbacher Weichenbau Gmbh, 6308 Butzbach Verfahren zur Wärmebehandlung von Weichenteilen im Durchlaufverfahren

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US882162A (en) * 1907-04-13 1908-03-17 William A Painter Method of hardening steel.
US2572201A (en) * 1948-02-10 1951-10-23 Air Reduction Method of hardening the ends of railroad rails

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1014678B (de) * 1955-06-07 1957-08-29 Bbc Brown Boveri & Cie Durchlaufinduktionsofen zur in Richtung der Laengsachse ungleichmaessigen Erwaermungvon Metallbloecken

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US882162A (en) * 1907-04-13 1908-03-17 William A Painter Method of hardening steel.
US2572201A (en) * 1948-02-10 1951-10-23 Air Reduction Method of hardening the ends of railroad rails

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4375995A (en) * 1978-05-12 1983-03-08 Nippon Steel Corporation Method for manufacturing high strength rail of excellent weldability
US4426236A (en) 1978-05-12 1984-01-17 Nippon Steel Corporation Method for manufacturing high strength rail of excellent weldability
US4899570A (en) * 1988-04-05 1990-02-13 Teledyne Industries, Inc. Apparatus and method of rotary forging with induction heating
CN102505589A (zh) * 2011-11-02 2012-06-20 中铁上海工程局有限公司 便携式钢轨焊接接头中高频电感应加热正火装置和方法
CN102505589B (zh) * 2011-11-02 2015-01-07 中铁上海工程局集团有限公司 便携式钢轨焊接接头中高频电感应加热正火装置和方法

Also Published As

Publication number Publication date
GB1228382A (en:Method) 1971-04-15
AT294878B (de) 1971-12-10
DE1758517B1 (de) 1970-12-10
BE717328A (en:Method) 1968-12-02
FR1583991A (en:Method) 1969-12-12

Similar Documents

Publication Publication Date Title
GB1055085A (en) Method of increasing the useful life of paired members co-operating in rolling contact
US3622407A (en) Method for electrical induction, heat treatment for railroad switches (rail tongues, crossings, wing rails)
ATE202151T1 (de) Verfahren zum herstellen eines werkstückes aus maschinenbaustahl und nach diesem verfahren hergestelltes werkstück
GB1178338A (en) A Method of and Apparatus for Inductively Heat Treating Steel Workpieces.
US3790413A (en) Process for a continuous heat treatment and apparatus therefor
CA1213160A (en) Method of manufacturing rails
EP2951327B1 (en) Forced water cooling of thick steel wires
HRP950386A2 (en) Process and apparatus for heat-treating shaped rolled pieces
US4704166A (en) Process for the production of medium carbon steel wire rod
CN113430337A (zh) 一种h13圆钢整体调质热处理方法
EP3568500A1 (en) Lead-free patenting process and equipment
US2103716A (en) Rail treatment method
JPS6328824A (ja) 高低抗性レールの製造方法
KR100366547B1 (ko) 레일의 열처리 방법 및 장치
US2356150A (en) Heat treatment of gear teeth
KR20160149212A (ko) 전강 피팅
US1171832A (en) Method of treating metals.
RU2428487C1 (ru) Способ поверхностной закалки чугуна и индуктор для его осуществления
GB933860A (en) Heat hardened rail and heat treating apparatus therefor
Genkin Welding and heat treatment of joints in railway rails in induction equipment
GB710426A (en) Improvements in or relating to the inductive heating of elongated metal bodies
EP0903414B1 (de) Anlage zur kontinuierlichen Wärmebehandlung von Stahlbändern
CN114854947B (zh) 一种轴承感应淬火扫描无软带起始区域热处理工艺
DE1205999B (de) Verfahren und Vorrichtung zum Oberflaechen-haerten von geschmiedeten oder gegossenenWalzen aus Stahl
SU1224344A1 (ru) Способ термической обработки длинномерных изделий