US3785883A - Method of operation when hot straightening elongated workpieces - Google Patents

Method of operation when hot straightening elongated workpieces Download PDF

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Publication number
US3785883A
US3785883A US00259663A US3785883DA US3785883A US 3785883 A US3785883 A US 3785883A US 00259663 A US00259663 A US 00259663A US 3785883D A US3785883D A US 3785883DA US 3785883 A US3785883 A US 3785883A
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United States
Prior art keywords
workpiece
straightening
heating
percent
supplied
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Expired - Lifetime
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US00259663A
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English (en)
Inventor
G Seulen
F Reinke
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SMS Elotherm GmbH
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AEG Elotherm GmbH
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Publication date
Application filed by AEG Elotherm GmbH filed Critical AEG Elotherm GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
    • 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
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating
    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
    • 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

  • the invention relates to a method of hot straightening elongated workpieces having a longitudinal axis and consisting of a non-ferromagnetic or a ferromagnetic material which for the purpose of effecting the hot straightening process is at least partly heated to a temperature above the Curie point.
  • the method of operation described in the abovementioned patents comprises mounting the ends of the workpiece and rotating the same about its longitudinal axis, inducing in the workpiece, by means of an inductor having heating conductors extending parallel to the workpiece axis currents of a magnitude and frequency suitable for at least raising the temperature of at least part of the workpiece to the level required for hot straightening, these currents and the currents induced thereby interacting to create a magnetic field which in turn generates electromagnetic forces acting between the inductor and the workpiece.
  • the direction of these forces is such that they cause repulsion between the inductor and the workpiece.
  • the said forces first give rise to attraction between the inductor and the workpiece.
  • the direction of action of the magnetic forces reverses so that finally the workpiece responds to the forces acting upon it as if it were made of a non-ferromagnetic material.
  • FIG. 1 is a schematic cross section showing the position of the workpiece in relation to the inductor, as proposed in the above-mentioned patents.
  • FIG. 2 is a schematic of an apparatus for hot straightening and quenching.
  • the workpiece l for instance an axle, is mounted in conventional manner between centers and can thus be rotated about its longitudinal axis by applying torque through one of the centers.
  • Inductive heating of the workpiece is effected by an inductor having a heating conductor 2 extending along the workpiece surface parallel to its axis and having a magnetic return 3 conventionally consisting of laminated sheet iron or pressed soft magnetic cores and a yoke 4.
  • the working program begins by rotating the mounted workpiece l in the direction indicated by arrow 5 and by switching on the inductor current. At a particular instant the current will flow through the heating conductor 2, for instance, towards the viewer, whereas in the yoke 4 it will then flow through the plane of the paper away from the viewer.
  • the respective directions of the current are indicated in FIG. I in conventional manner by dots and crosses in circles.
  • the inductor current in the linear heating conductor 2 induces currents in the workpiece which in the region facing the heating conductor flow in the workpiece in a direction contrary to the direction of the inductor current, whereas on both sides thereof return currents flow in the workpiece 1.
  • the inductor current and the induced current will generate forces urging the workpiece 1 away from the inductor in the direction of arrow 6.
  • straightening rollers 7 and 8 which function as straightening abutments, and which in their positions of rest (shown in dashed outline in FIG.
  • FIG. 2 shows a conventional apparatus for permitting the workpiece to be simultaneously hot straightened and surface-hardened.
  • a container ll containing a quench 10 contains a drum-shaped carrier 13 which can be indexed about its axis 12, and which is equipped at angular intervals of 90 with devices for chucking up the elongated workpieces I, each such device being associated with a system of adjustable straightening rollers 7 and 8.
  • a workpiece 14 that is to be treated is chucked up in one such device that is in a position facing the inductor 15, rotation is imparted to the workpiece, the inductor current is switched on and-as has already been described with reference to FIG. lthe straightening rollers 7 and 8, controlled for instance by a timing delay, are advanced into contact with the workpiece.
  • the power supply to the inductor has been cut off-the workpiece continuing to be rotated in contact with the straightening rollers 7 and 8-the chucking device 13 is indexed 90, as indicated by an arrow 16, the heated and hot straightened workpiece being thus immersed in the quench 10.
  • the same indexing movement carries another chucking device containing a quenched and hardened workpiece 17 into the heating station where it is taken down and its place taken by another workpiece that is to be treated.
  • inducing in said workpiece by means of an inductor having heating conductors extending parallel to the workpiece axis, currents for raising at least part of the workpiece to the temperature required for hot straightening, said current and the currents induced thereby creating a magnetic field which generates electromagnetic forces between inductor and workpiece, advancing straightening abutments towards the workpiece at the end of a given heating period,
  • the improvement comprising advancing said stops to contact said workpiece only after at least 75 percent of the total energy supplied to said workpiece during said heating has already been supplied.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat Treatment Of Articles (AREA)
US00259663A 1971-07-05 1972-06-05 Method of operation when hot straightening elongated workpieces Expired - Lifetime US3785883A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712133345 DE2133345A1 (de) 1971-07-05 1971-07-05 Arbeitsweise zum warmrichten von langgestreckten werkstuecken

Publications (1)

Publication Number Publication Date
US3785883A true US3785883A (en) 1974-01-15

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ID=5812699

Family Applications (1)

Application Number Title Priority Date Filing Date
US00259663A Expired - Lifetime US3785883A (en) 1971-07-05 1972-06-05 Method of operation when hot straightening elongated workpieces

Country Status (4)

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US (1) US3785883A (cs)
DE (1) DE2133345A1 (cs)
FR (1) FR2144752B1 (cs)
GB (1) GB1316536A (cs)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1043087A1 (de) * 1999-04-03 2000-10-11 Karl Heess Gmbh & Co. Maschinenbau Wellenricht- und -härtemaschine
US20090255923A1 (en) * 2007-07-26 2009-10-15 Zenergy Power Gmbh Induction Heating Method
CN105251811A (zh) * 2015-11-16 2016-01-20 梁俊 一种渔竿电热校直槽
US11465187B2 (en) * 2018-09-14 2022-10-11 Korea Electric Power Corporation Bent rotor straightening method using low frequency induction heating and bent rotor straightening apparatus using same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017011048B4 (de) * 2017-11-29 2019-07-04 Efd Induction Gmbh Vorrichtung und induktives Härteverfahren zum induktiven Härten von metallischen Werkstücken sowie Verwendung der Vorrichtung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1043087A1 (de) * 1999-04-03 2000-10-11 Karl Heess Gmbh & Co. Maschinenbau Wellenricht- und -härtemaschine
US6308547B1 (en) 1999-04-03 2001-10-30 Karl Heess Gmbh & Co. Maschinenbau Shaft straightening and hardening machine and workpiece holder therefor
US20090255923A1 (en) * 2007-07-26 2009-10-15 Zenergy Power Gmbh Induction Heating Method
CN105251811A (zh) * 2015-11-16 2016-01-20 梁俊 一种渔竿电热校直槽
US11465187B2 (en) * 2018-09-14 2022-10-11 Korea Electric Power Corporation Bent rotor straightening method using low frequency induction heating and bent rotor straightening apparatus using same

Also Published As

Publication number Publication date
FR2144752A1 (cs) 1973-02-16
DE2133345A1 (de) 1973-01-18
GB1316536A (en) 1973-05-09
FR2144752B1 (cs) 1976-08-06

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