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US3236993A - Induction heating - Google Patents

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US3236993A
US3236993A US278808A US27880863A US3236993A US 3236993 A US3236993 A US 3236993A US 278808 A US278808 A US 278808A US 27880863 A US27880863 A US 27880863A US 3236993 A US3236993 A US 3236993A
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inductor
projections
limbs
loop
teeth
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US278808A
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Jones David Griffiths
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Delapena and Son Ltd
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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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like

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  • This invention relates to induction heating and in particular to methods of and apparatus for induction heating gears and other elements having a toothed or serrated periphery.
  • the invention can be applied to heating either an external or internal periphery, and is of especially advantageous application to the case hardening of gear teeth and the splines of splined elements.
  • the other method produces a hot line in a single tooth space, this line being scanned along the length of the gear and the scanning repeated for each tooth space.
  • This method produces a much more even case but for mass production purposes has the disadvantage of being relatively slow, a disadvantage which it is the ⁇ object of the invention to materially reduce.
  • an inductor for induction heating a toothed or serrated surface of an element comprises a single turn current carrying loop generally profiled to suit the surface and having projections which project into the spaces between the teeth or serrations when the element and the inductor are coaxially arranged, each projection being associated with a U-shaped magnetic core which straddles the inductor loop with the free ends of the limbs of each core extending in the same direction as the respective projection.
  • the cores are of laminated form to withstand thermal shock which can be great when rapid rates of heating are used.
  • dust composition cores may be used, or they may be moulded from ferrite material.
  • the laminations preferably lie in planes perpendicular to the adjacent part of the current carrying loop.
  • the magnetic cores are housed in slots formed in the surface of the current carrying loop.
  • the free ends of the limbs of each core extend somewhat beyond the edge of the corresponding projection on the current carrying loop.
  • the inductor of the invention produces current loops in the spaces between the teeth or serrations and also a circulating current which is induced round the complete periphery of the element.
  • the effect of the circulating current may be reduced to a relatively low value by cutting away the inductor between the projections thereof, for example by machining slots in the inductor.
  • the effect of these slots is to increase the effective diameter of the inductor current path, leaving the cores acting as fiux intensifiers in said spaces.
  • the slots are preferably filled with a ferro-magnetic material, for example iron laminae.
  • the axial Width of the inductor 3,236,993 Patented Feb. 22, 1966 ice and the width of the cores are suitably designed to produce overlapping circulating current paths at the roots 0f the teeth or serrations, such overlapping producing an additional heating effect where it is most needed.
  • a method of induction heating an element with a toothed or serrated periphery comprises the steps of arranging the element and a single turn annular inductor in axial alignment, the inductor having spaced projections each associated with a U-shaped core which straddles the inductor with the ends of the core limbs and the projections aligned with the spaces between the teeth or serrations, energising the inductor to induce heating current loops in the peripheral surface of the element in said spaces, and causing relative traversing movement of the inductor and the element along the length of the latter.
  • heating current loops are produced in each of said spaces, and when the inductor has completely traversed the element the flanks of all the teeth or serrations are effectively heated.
  • overlapping current loops are produced in each space, the overlapping of the loops producing an increased heating effect at the roots of the teeth or serrations, thus compensating for the mass effect in those positions.
  • FIGURE l is a perspective view partly broken away showing part of an inductor according to the invention in position surrounding a gear to be heat treated,
  • FIGURE 2 is a plan view of the inductor of FIG- URE 1,
  • FIGURE 3 is a cross-sectional View on the line III-III in FIGURE 2,
  • FIGURE 4 is an enlarged fragmentary plan view showing the arrangement of the laminated cores on the current carrying loop
  • FIGURE 5 is a perspective view corresponding to FIG- URE l showing a modified form of the invention.
  • the inductors are designed for use in case hardening an external toothed gear wheel.
  • the inductor comprises a single turn current-carrying loop in the form of a copper ring 10 machined with an internal profile generally inverse to the gear profile so providing projections which extend into the toothed spaces and lie closely -adjacent the tooth flanks of the gear when the gear and the inductor are coaxially located.
  • the copper ring 10 is formed with radial slots on both annular faces and an axial slot on its external cylindrical surface, in the region of each projection.
  • a U-shaped laminated ferro-magnetic core is pressed into position in the slots, the core being so dimensioned that the external surfaces of the laminations 11 are flush with the radial and external faces of the copper ring, as seen in FIGURE l.
  • the free ends 12 of the limbs ⁇ of these laminations extend somewhat Ibeyond the tips of the projections on the inductor loop (13 in FIGURE 3).
  • the space between the projecting ends of the limbs may be filled with a heat resistant insulating material 14.
  • the laminated cores are supported over most of their length by the projections on the copper ring and these projections also tend to weaken the magnetic flux around the inductor between ythe laminated cores and to intensify the field between the tips of the limbs of the cores. This increases the heating effect at the roots of the teeth yon the gear wheel.
  • each of the projections the copper ring is slotted or cut back on its internal surface as shown at 15 and each slot so formed is filled with a ferro-magnetic material, preferably iron laminations 16.
  • a ferro-magnetic material preferably iron laminations 16.
  • the current-carrying loop may be provided with an internal cooling water channel 17 which is conveniently formed by machining an external groove in the loop and brazing a band of copper 18 around t-he external surface, before the laminated cores are applied.
  • the copper ring is radially split midway between two of the projections as shown in FIGURE 2 and provi-ded with terminal members 19, 20 by which the high frequency electric -current is applied. These terminals are also formed with passages Z1, 22 by which cooling water is circulated through the channel 17.
  • the current-carrying loop 23 is formed with projections to lie between the teeth of the gear wheel, as in the previous example, but the laminated cores 24 are not housed in slots in the loop but are fitted over its external surface. This construction is suitable for specific applica-tions.
  • An inductor -for induction heating a toothed or serrated surface of an element comprising a single turn current-carrying loop providing a continuous conductive path with a gap between its ends, said inductor being generally profiled to suit the surface and having projections which project into the spaces between the tee-th or serrations when the element and the inductor are coaxially arranged, said projections extending radially outwardly a distance greater than the gaps between said projections, and a plurality of U-shaped magnetic cores individually :associated with said projections, each magnetic core straddling the inductor loop with the free ends of the limbs of each core extending in the same direction as the respective projection and the other ends of the limbs extendmg radially outwardly a distance greater than the gaps between said projections.
  • An inductor for induction heating the peripheral surface of a toothed article such as a gear wheel comprising a single turn conductor loop providing a continuous conductive path with a gap between its ends, lsaid inductor being profiled to suit the surface and coaxially surround the latter, said conductor loop having spaced projections which project into the spaces between the teeth on said surface and radial surface slots aligned with said projections, said projections extending radially outwardly a distance greater t-han the gaps between said projections, and a plurality of U-shaped magnetic cores engaging said slots and straddling the conductor loop with the free ends of the limbs of each core extending in the same direction ts the respective projection and slightly d beyond the edge thereof and the other ends of the limbs extending radially outwardly a distance greater than the gaps between said projections.
  • An inductor for induction heating a toothed or serrated surface of an element comprising a single turn current-carrying loop providing a continuous conductive path with a gap between its ends, said inductor being generally proled to suit the surface and having projections which project into the spaces between the teeth or serrations when the element and the inductor are coaxially arranged, said projections extending radially outwardly a distance greater than the gaps between said projections, the loop being cut away between the projections so as to reduce the heating effect at the tip of eac-h tooth on the element and a plurality of U-shaped magnetic cores individually associated with said projections, each magnetic core straddling the inductor loop with the freer ends of the limbs of the core extending in the same direction as the ⁇ respective projection and the other ends of the limbs extending radially outwardly a distance greater than the gaps between said projections.
  • An inductor for induction heating a toothed or serrated surface of an element comprising -a single turn current-carrying loop generally profiled to suit the surface and having projections which project into the spaces between the teeth or serrations when the element and the inductor are coaxially arranged, the loop being formed with slots between the projections so as to reduce the -heating effect at the tip of each toot-h on the element, a tilling of ferro-magnetic material in each such slot, land a plurality of U-shaped magnetic cores individually associated with said projections, each magnetic core straddling the inductor loop with the free ends of the limbs of the core extending in the same direction vas the respective projection.
  • each filling of ferro-magnetic material is in the form of iron laminations.
  • An inductor for induction heating a toothed peripheral surface of an element such as a gear wheel comprising a single turn current-carrying loop providing a continuous c-onductive path with a gap between its ends, said inductor being generally profiled to suit and coaxially surround the :surface and having projections whichl project into the spaces between the Iteeth or serrations when the element and the inductor are coaxially arranged, said projections extending radially outwardly a distance greater than the gaps between said projections, and a plurality of U-shaped laminated magnetic cores individually associated with said projections, each magnetic core being disposed radially of and straddling the inductor loop with the free ends lof the limbs of each core extending in the same direction as the respective projections and the other ends of the limbs extending radially outwardly a distance greater than the gaps 'between said projections.

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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)
  • General Induction Heating (AREA)

Description

United States Patent 3,236,993 INDUCTION HEATING David Griiliths Jones, Cheltenham, England, assignor to Delapena & Son Limited, Cheltenham, England Filed May 6, 1963, Ser. No. 278,808
Claims priority, application Great Britain, May 5, 1962,
Claims. (Cl. 219-10.59)
This invention relates to induction heating and in particular to methods of and apparatus for induction heating gears and other elements having a toothed or serrated periphery. The invention can be applied to heating either an external or internal periphery, and is of especially advantageous application to the case hardening of gear teeth and the splines of splined elements.
At present there are two general methods in use to produce a hardened surface of gear teeth employing induction heating. In the older of these methods the gear is encircled by a single or multi-turn helical inductor, and when the surfaces reach the required temperature the gear is quenched in water or other suitable medium. This does not result in true case hardening, as the teeth tend to be hardened throughout and due to the mass effect the roots of the teeth are not sufficiently hot when the teeth themselves reach hardening temperature; as a result the roots are not effectively hardened. There is also the so-called striation effect which results in alternating relatively hot and cool bands round the gear, with consequent variations in the case hardness and depth. The other method produces a hot line in a single tooth space, this line being scanned along the length of the gear and the scanning repeated for each tooth space. This method produces a much more even case but for mass production purposes has the disadvantage of being relatively slow, a disadvantage which it is the `object of the invention to materially reduce.
According to the invention an inductor for induction heating a toothed or serrated surface of an element, comprises a single turn current carrying loop generally profiled to suit the surface and having projections which project into the spaces between the teeth or serrations when the element and the inductor are coaxially arranged, each projection being associated with a U-shaped magnetic core which straddles the inductor loop with the free ends of the limbs of each core extending in the same direction as the respective projection.
Preferably the cores are of laminated form to withstand thermal shock which can be great when rapid rates of heating are used. However, dust composition cores may be used, or they may be moulded from ferrite material.
The laminations preferably lie in planes perpendicular to the adjacent part of the current carrying loop.
According to a preferred feature of the invention the magnetic cores are housed in slots formed in the surface of the current carrying loop.
Preferably the free ends of the limbs of each core extend somewhat beyond the edge of the corresponding projection on the current carrying loop.
In use the inductor of the invention produces current loops in the spaces between the teeth or serrations and also a circulating current which is induced round the complete periphery of the element. The effect of the circulating current may be reduced to a relatively low value by cutting away the inductor between the projections thereof, for example by machining slots in the inductor. The effect of these slots is to increase the effective diameter of the inductor current path, leaving the cores acting as fiux intensifiers in said spaces. The slots are preferably filled with a ferro-magnetic material, for example iron laminae. The axial Width of the inductor 3,236,993 Patented Feb. 22, 1966 ice and the width of the cores are suitably designed to produce overlapping circulating current paths at the roots 0f the teeth or serrations, such overlapping producing an additional heating effect where it is most needed.
According to another aspect of the invention a method of induction heating an element with a toothed or serrated periphery comprises the steps of arranging the element and a single turn annular inductor in axial alignment, the inductor having spaced projections each associated with a U-shaped core which straddles the inductor with the ends of the core limbs and the projections aligned with the spaces between the teeth or serrations, energising the inductor to induce heating current loops in the peripheral surface of the element in said spaces, and causing relative traversing movement of the inductor and the element along the length of the latter.
By the method of the invention heating current loops are produced in each of said spaces, and when the inductor has completely traversed the element the flanks of all the teeth or serrations are effectively heated. Preferably overlapping current loops are produced in each space, the overlapping of the loops producing an increased heating effect at the roots of the teeth or serrations, thus compensating for the mass effect in those positions.
The invention may be performed in various ways and two specific embodiments will now be described -by way of example with reference t0 the accompanying drawings, in which:
FIGURE l is a perspective view partly broken away showing part of an inductor according to the invention in position surrounding a gear to be heat treated,
FIGURE 2 is a plan view of the inductor of FIG- URE 1,
FIGURE 3 is a cross-sectional View on the line III-III in FIGURE 2,
FIGURE 4 is an enlarged fragmentary plan view showing the arrangement of the laminated cores on the current carrying loop, and
FIGURE 5 is a perspective view corresponding to FIG- URE l showing a modified form of the invention.
In these examples the inductors are designed for use in case hardening an external toothed gear wheel. As seen in FIGURES l and 2 the inductor comprises a single turn current-carrying loop in the form of a copper ring 10 machined with an internal profile generally inverse to the gear profile so providing projections which extend into the toothed spaces and lie closely -adjacent the tooth flanks of the gear when the gear and the inductor are coaxially located.
The copper ring 10 is formed with radial slots on both annular faces and an axial slot on its external cylindrical surface, in the region of each projection. At each projection a U-shaped laminated ferro-magnetic core is pressed into position in the slots, the core being so dimensioned that the external surfaces of the laminations 11 are flush with the radial and external faces of the copper ring, as seen in FIGURE l. The free ends 12 of the limbs `of these laminations extend somewhat Ibeyond the tips of the projections on the inductor loop (13 in FIGURE 3). The space between the projecting ends of the limbs may be filled with a heat resistant insulating material 14. It will be noted that the laminated cores are supported over most of their length by the projections on the copper ring and these projections also tend to weaken the magnetic flux around the inductor between ythe laminated cores and to intensify the field between the tips of the limbs of the cores. This increases the heating effect at the roots of the teeth yon the gear wheel.
Between each of the projections the copper ring is slotted or cut back on its internal surface as shown at 15 and each slot so formed is filled with a ferro-magnetic material, preferably iron laminations 16. This arrangement further reduces the magnetic flux adjacent the tips of the teeth on the gear wheel by providing a magnetic bypass around 4the current-carrying loop.
The current-carrying loop may be provided with an internal cooling water channel 17 which is conveniently formed by machining an external groove in the loop and brazing a band of copper 18 around t-he external surface, before the laminated cores are applied.
The copper ring is radially split midway between two of the projections as shown in FIGURE 2 and provi-ded with terminal members 19, 20 by which the high frequency electric -current is applied. These terminals are also formed with passages Z1, 22 by which cooling water is circulated through the channel 17.
In the modification illustrated in FIGURE the current-carrying loop 23 is formed with projections to lie between the teeth of the gear wheel, as in the previous example, but the laminated cores 24 are not housed in slots in the loop but are fitted over its external surface. This construction is suitable for specific applica-tions.
In some applications it is also desirable to provide a supply of quenching `water and this -can readily be delivered by providing apertures communicating with the cooling water passage 17.
I claim:
1. An inductor -for induction heating a toothed or serrated surface of an element, comprising a single turn current-carrying loop providing a continuous conductive path with a gap between its ends, said inductor being generally profiled to suit the surface and having projections which project into the spaces between the tee-th or serrations when the element and the inductor are coaxially arranged, said projections extending radially outwardly a distance greater than the gaps between said projections, and a plurality of U-shaped magnetic cores individually :associated with said projections, each magnetic core straddling the inductor loop with the free ends of the limbs of each core extending in the same direction as the respective projection and the other ends of the limbs extendmg radially outwardly a distance greater than the gaps between said projections.
2. An inductor as claimed in claim 1, in which the magnetic cores are laminated.
3. An inductor as claimed in claim 2, in which the laminations lie in planes perpendicular to the adjacent part of the current carrying loop.
4t. An inductor as claimed in claim 1, in which the free ends of the limbs of each core extend :somewhat beyond the edge of the corresponding projection on the current-carrying loop.
5. An inductor as claimed in claim 1, in which the axial dimensions of the inductor loop and the axial spacing lbetween the limbs of each core [are appreciably smaller than the axial dimensions of the element to be heated so that overlapping circulating current paths are induced in the surface of the element.
6. An inductor for induction heating the peripheral surface of a toothed article such as a gear wheel, comprising a single turn conductor loop providing a continuous conductive path with a gap between its ends, lsaid inductor being profiled to suit the surface and coaxially surround the latter, said conductor loop having spaced projections which project into the spaces between the teeth on said surface and radial surface slots aligned with said projections, said projections extending radially outwardly a distance greater t-han the gaps between said projections, and a plurality of U-shaped magnetic cores engaging said slots and straddling the conductor loop with the free ends of the limbs of each core extending in the same direction ts the respective projection and slightly d beyond the edge thereof and the other ends of the limbs extending radially outwardly a distance greater than the gaps between said projections.
7. An inductor for induction heating a toothed or serrated surface of an element, comprising a single turn current-carrying loop providing a continuous conductive path with a gap between its ends, said inductor being generally proled to suit the surface and having projections which project into the spaces between the teeth or serrations when the element and the inductor are coaxially arranged, said projections extending radially outwardly a distance greater than the gaps between said projections, the loop being cut away between the projections so as to reduce the heating effect at the tip of eac-h tooth on the element and a plurality of U-shaped magnetic cores individually associated with said projections, each magnetic core straddling the inductor loop with the freer ends of the limbs of the core extending in the same direction as the `respective projection and the other ends of the limbs extending radially outwardly a distance greater than the gaps between said projections.
8. An inductor for induction heating a toothed or serrated surface of an element, comprising -a single turn current-carrying loop generally profiled to suit the surface and having projections which project into the spaces between the teeth or serrations when the element and the inductor are coaxially arranged, the loop being formed with slots between the projections so as to reduce the -heating effect at the tip of each toot-h on the element, a tilling of ferro-magnetic material in each such slot, land a plurality of U-shaped magnetic cores individually associated with said projections, each magnetic core straddling the inductor loop with the free ends of the limbs of the core extending in the same direction vas the respective projection.
9. An inductor according to claim 8, wherein each filling of ferro-magnetic material is in the form of iron laminations.
10. An inductor for induction heating a toothed peripheral surface of an element such as a gear wheel comprising a single turn current-carrying loop providing a continuous c-onductive path with a gap between its ends, said inductor being generally profiled to suit and coaxially surround the :surface and having projections whichl project into the spaces between the Iteeth or serrations when the element and the inductor are coaxially arranged, said projections extending radially outwardly a distance greater than the gaps between said projections, and a plurality of U-shaped laminated magnetic cores individually associated with said projections, each magnetic core being disposed radially of and straddling the inductor loop with the free ends lof the limbs of each core extending in the same direction as the respective projections and the other ends of the limbs extending radially outwardly a distance greater than the gaps 'between said projections.
References Cited by the Examiner UNITED STATES PATENTS 2,761,048 8/1956 Tudbury 219-10.43 2,857,154 10/1958 Jones 219-1059 3,121,780 2/1964 Mucha et al. 12.19-10.79
FOREIGN PATENTS 892,353 8/1953 Germany.
904,804 1/ 1954 Germany.
576,791 4/ 1946 Great Britain.
775,463 5/1957 Great Britain.
RICHARD M. WOOD, Primary Examiner, L. H. BENDER, Assistant Examiner.,

Claims (1)

1. AN INDUCTOR FOR INDUCTION HEATING A TOOTHED OR SERRATED SURFACE OF AN ELEMENT, COMPRISING A SINGLE TURN CURRENT-CARRYING LOOP PROVIDING A CONTINUOUS CONDUCTIVE PATH WITH A GAP BETWEEN ITS ENDS, SAID INDUCTOR BEING GENERALLY PROFILED TO SUIT THE SURFACE AND HAVING PROJECTIONS WHICH PROJECT INTO THE SPACES BETWEEN THE TEETH OR SERRATIONS WHEN THE ELEMENT AND THE INDUCTOR ARE COAXIALLY ARRANGED, SAID PROJECTIONS EXTENDING RADIALLY OUTWARDLY A DISTANCE GREATER THAN THE GAPS BETWEEN SAID PROJECTIONS, AND A PLURALITY OF U-SHAPED MAGNETIC CORES INDIVIDUALLY ASSOCIATED WITH SAID PROJECTIONS, EACH MAGNETIC CORE STANDING THE INDUCTOR LOOP WITH THE FREE ENDS OF THE LIMBS OF EACH CORE EXTENDING IN THE SAME DIRECTION AS THE RESPECTIVE PROJECTION AND THE OTHER ENDS OF THE LIMBS EXTENDING RADIALLY OUTWARDLY A DISTANCE GREATER THAN THE GAPS BETWEEN SAID PROJECTIONS.
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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4251704A (en) * 1979-03-28 1981-02-17 Park-Ohio Industries, Inc. Unit for induction heating and hardening gear teeth
US4386255A (en) * 1979-12-17 1983-05-31 Rca Corporation Susceptor for rotary disc reactor
US4481397A (en) * 1981-11-13 1984-11-06 Cem Compagnie Electro Mecanique Apparatus for the magnetic induction heating of flat, rectangular metal products traveling in their longitudinal direction
US4673784A (en) * 1985-03-18 1987-06-16 Tocco, Inc. Valve seat inductor and method of using same
US4745251A (en) * 1985-03-18 1988-05-17 Tocco, Inc. Valve seat inductor
EP0345535A3 (en) * 1988-06-07 1990-11-28 Schwabische Huttenwerke Gesellschaft Mit Beschrankter Haftung Production method of a hardened guide shaft for a linear guide
US5242514A (en) * 1988-06-07 1993-09-07 Richard Wiener Method for the production of a hardened guide shaft for a linear guide
US5397876A (en) * 1993-01-07 1995-03-14 Mitsubishi Jukogyo Kabushiki Kaishi High frequency bolt heater having induction heating coil
US5488219A (en) * 1993-12-13 1996-01-30 Neturen Co., Ltd. Induction heating coil assembly and method for hardening inner surface of cylinder by using the same
US6548793B1 (en) 2001-06-29 2003-04-15 Torque-Traction Technologies, Inc. Apparatus and method of inductively heat treating a beveled gear
US20050161132A1 (en) * 2004-01-27 2005-07-28 Gillette Edward J. Method and apparatus for case hardening a work piece
US20090020525A1 (en) * 2007-07-21 2009-01-22 Loveless Don L Electric Induction Heat Treatment
EP2652160B1 (en) 2010-12-15 2015-10-14 Mahle International GmbH Heating device
CN105624389A (en) * 2016-03-23 2016-06-01 中钢集团西安重机有限公司 Gear quenching inductor head and manufacturing method
US20160316523A1 (en) * 2013-12-19 2016-10-27 Neturen Co., Ltd. Induction heating coil and induction heating method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2538690A1 (en) * 1975-08-30 1977-03-03 Aeg Elotherm Gmbh DEVICE FOR INDUCTIVE HEATING OF WORKPIECES, IN PARTICULAR FOR HEATING CAMSHAFT

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB576791A (en) * 1943-04-05 1946-04-18 Standard Telephones Cables Ltd Inductor element
DE892353C (en) * 1940-05-30 1953-10-05 Deutsche Edelstahlwerke Ag Device for electro-inductive surface heating of toothed workpieces
DE904804C (en) * 1943-10-28 1954-02-22 Aeg Heat conductor loop for gap hardening
US2761048A (en) * 1953-06-25 1956-08-28 Ohio Crankshaft Co High-frequency inductor
GB775463A (en) * 1953-04-27 1957-05-22 Delapena & Son Ltd Improvements in or relating to high frequency induction heating apparatus
US2857154A (en) * 1950-11-30 1958-10-21 Delapena & Son Ltd Apparatus for heat treating toothed articles by high frequency induction heating
US3121780A (en) * 1961-07-10 1964-02-18 Ohio Crankshaft Co Inductor for heating a channel member

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE892353C (en) * 1940-05-30 1953-10-05 Deutsche Edelstahlwerke Ag Device for electro-inductive surface heating of toothed workpieces
GB576791A (en) * 1943-04-05 1946-04-18 Standard Telephones Cables Ltd Inductor element
DE904804C (en) * 1943-10-28 1954-02-22 Aeg Heat conductor loop for gap hardening
US2857154A (en) * 1950-11-30 1958-10-21 Delapena & Son Ltd Apparatus for heat treating toothed articles by high frequency induction heating
GB775463A (en) * 1953-04-27 1957-05-22 Delapena & Son Ltd Improvements in or relating to high frequency induction heating apparatus
US2761048A (en) * 1953-06-25 1956-08-28 Ohio Crankshaft Co High-frequency inductor
US3121780A (en) * 1961-07-10 1964-02-18 Ohio Crankshaft Co Inductor for heating a channel member

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4251704A (en) * 1979-03-28 1981-02-17 Park-Ohio Industries, Inc. Unit for induction heating and hardening gear teeth
US4386255A (en) * 1979-12-17 1983-05-31 Rca Corporation Susceptor for rotary disc reactor
US4481397A (en) * 1981-11-13 1984-11-06 Cem Compagnie Electro Mecanique Apparatus for the magnetic induction heating of flat, rectangular metal products traveling in their longitudinal direction
US4673784A (en) * 1985-03-18 1987-06-16 Tocco, Inc. Valve seat inductor and method of using same
US4745251A (en) * 1985-03-18 1988-05-17 Tocco, Inc. Valve seat inductor
EP0345535A3 (en) * 1988-06-07 1990-11-28 Schwabische Huttenwerke Gesellschaft Mit Beschrankter Haftung Production method of a hardened guide shaft for a linear guide
US5242514A (en) * 1988-06-07 1993-09-07 Richard Wiener Method for the production of a hardened guide shaft for a linear guide
US5397876A (en) * 1993-01-07 1995-03-14 Mitsubishi Jukogyo Kabushiki Kaishi High frequency bolt heater having induction heating coil
US5488219A (en) * 1993-12-13 1996-01-30 Neturen Co., Ltd. Induction heating coil assembly and method for hardening inner surface of cylinder by using the same
US6548793B1 (en) 2001-06-29 2003-04-15 Torque-Traction Technologies, Inc. Apparatus and method of inductively heat treating a beveled gear
US20050161132A1 (en) * 2004-01-27 2005-07-28 Gillette Edward J. Method and apparatus for case hardening a work piece
US20090020525A1 (en) * 2007-07-21 2009-01-22 Loveless Don L Electric Induction Heat Treatment
US10856370B2 (en) * 2007-07-21 2020-12-01 Inductoheat, Inc. Electric induction heat treatment
EP2652160B1 (en) 2010-12-15 2015-10-14 Mahle International GmbH Heating device
US20160316523A1 (en) * 2013-12-19 2016-10-27 Neturen Co., Ltd. Induction heating coil and induction heating method
US10314118B2 (en) * 2013-12-19 2019-06-04 Neturen Co., Ltd. Induction heating coil and induction heating method
CN105624389A (en) * 2016-03-23 2016-06-01 中钢集团西安重机有限公司 Gear quenching inductor head and manufacturing method

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