US3301990A - Work coil for induction heating - Google Patents

Work coil for induction heating Download PDF

Info

Publication number
US3301990A
US3301990A US338448A US33844864A US3301990A US 3301990 A US3301990 A US 3301990A US 338448 A US338448 A US 338448A US 33844864 A US33844864 A US 33844864A US 3301990 A US3301990 A US 3301990A
Authority
US
United States
Prior art keywords
coil
turns
heating
longitudinal axis
objects
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
US338448A
Other languages
English (en)
Inventor
Neal Herbert
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.)
US Philips Corp
North American Philips Co Inc
Original Assignee
US Philips Corp
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
Priority claimed from AU26427/63A external-priority patent/AU272209B2/en
Application filed by US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3301990A publication Critical patent/US3301990A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
    • H05B6/103—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor

Definitions

  • This invention relates .to inductive heating devices comprising at least one rotary coil having a plurality of turns in the magnetic field of which an object may be heated wholly or in part by high-frequency energy.
  • Such a device is generally known per se.
  • the utility of the known heating device may be considerably improved if, according to the invention, the coil is made rotatable about its own longitudinal axis or about another axis extending in parallel with it. It has been found that, as reckonul over the length of the coil, the uniformity of heating at a certain distance from the longitudinal axis of the coil is greatly improved both inside and outside the diameter of the coil.
  • a heating device may be used, for example, for heating the wall of a bore such as may be present, for example, in a metallic casting or forging where the wall of the here is required to be heated very uniformly.
  • the choice of the rotary coil it is also rendered possible, for example, in bulk manufacturing processes, for a large number of small objects present on a conveyer belt to be exposed in succession to an identical thermal treatment with no need, for example, to stop the conveyor belt periodically for a short time.
  • such an embodiment is characterized in that a conveyer for the objects, preferably arranged outside the coil, is designed to transport a number of objects in the longitudinal direction of the coil, thereby leaving the objects during their transport wholly or in part between adjacent turns of the coil.
  • a conveyer for the objects preferably arranged outside the coil
  • the space which exists directly between the material of adjacent turns and where the inductive heating is strongest is thus utilized most efficiently, This is also important, for example, for heating objects which cannot readily be introduced into a high-frequency coil because of their dimensions.
  • An inductoin heating technique of this type has the further advantage, for example, that temperature control on the transported, treated objects is possible, for example, by slightly varying the pitch of the turns in the same coil.
  • the .turns of the coil be circular. Also it is not always necessary for all the turns to be wholly identical.
  • One portion of the coil may have, for example, elliptical turns and another portion may have, for example, circular turns.
  • the diameters of the various turns may differ greatly according to require- 3,301,990 Patented Jan. 31, 1967 ice ments and it is also possible that the pitch, as reckoned over the length of the coil, is not chosen constant in order to make the heating of the objects adjustable.
  • the Whole of the coil may have, likewise, according to requirements, a shape which is, for example, conical.
  • the figure shows an inductance coil 1 which is connected by means of couplings 3 and 5 to shafts 7 and 9.
  • the shaft 9 is a driven shaft so that the coil 1 is rotatable about an axis which lies in line with the shaft 9.
  • the coil 1 is connected through the shafts 7 and 9 to an electric circuit, This electric circuit and the manner in which the coil 1 is possibly cooled will not be described further in this specification.
  • the arrangement is synchronized with the angular velocity of the coil so that, during rotation of the coil, the objects can remain, at least in part, between adjacent turns of the coil during their transport.
  • the objects may thus be exposed during transport to intense heating in a field between the material of adjacent turns with no need for the objects to leave, for example, the conveyor belt in the meantime.
  • the coil rotates about an axis of rotation extending in line with the shaft 9.
  • the arrangement may be such that .the coil is rotated about an axis parallel to its own longitudinal axis.
  • the heating zone of the objects 17 laterally inserted into the coil is extended and the energy imparted to the objects is distributed more satisfactorily.
  • Apparatus for inductively heating one or more objects comprising, an induction heating coil having a plurality of turns and a longitudinal axis, means for supplying high-frequency electrical energy to said coil, means positioning said object to be heated adjacent said coil in operative relation to the magnetic field of the coil, means for rotating said coil about its longitudinal axis or about an axis parallel thereto, and conveyor means for moving said object to be heated in a direction parallel to said longitudinal axis of the coil, said conveyor means and said coil being arranged relative to one another so that during the transport of said object at least a portion of said object extends between adjacent turns of said coil.
  • Apparatus for inductively heating an object comprising, an induction heating coil having a plurality of turns extending along its longitudinal axis, means for supplying high-frequency electrical energy to said coil, means positioning said object to be heated adjacent said coil in operative relation to the magnetic field of the coil, means for rotating said coil about said longitudinal axis, and means for moving said object in synchronism with the coil rotation in a direction parallel to said longitudinal axis and at a speed relative thereto such that at least a portion of said object extends between adjacent turns of said coil.
  • Apparatus for inductively heating an object comprising, an induction heating coil having a plurality of turns extending along its longitudinal axis, means for supplying high-frequency electrical energy to said coil, means positioning said object to be heated adjacent said coil in operative relation to the magnetic field of the coil, and means for rotating said coil about an axis parallel to and spaced apart from said longitudinal axis.
  • Apparatus as described in claim 9 further com-- prising means for moving said object in synchronism with the coil rotation in a direction parallel to said 10ngi-,
  • Apparatus as described in claim 10 wherein the pitch of the coil turns varies along the longitudinal axis in accordance with a predetermined heating program for said object.
  • Apparatus for inductively heating an object comprising, an induction heating coil having a plurality of turns extending along its longitudinal axis, means for supplying high-frequency electrical energy to said coil, means positioning said object to be heated adjacent said coil in operative relation to the magnetic field of the coil such that a part of said object extends between adjacent turns of said coil, and means for rotating said coil about said longitudinal axis.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Induction Heating (AREA)
US338448A 1963-01-17 1964-01-17 Work coil for induction heating Expired - Lifetime US3301990A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU26427/63A AU272209B2 (en) 1963-01-17 Improved induction heating apparatus

Publications (1)

Publication Number Publication Date
US3301990A true US3301990A (en) 1967-01-31

Family

ID=3714983

Family Applications (1)

Application Number Title Priority Date Filing Date
US338448A Expired - Lifetime US3301990A (en) 1963-01-17 1964-01-17 Work coil for induction heating

Country Status (5)

Country Link
US (1) US3301990A (enrdf_load_html_response)
CH (1) CH414031A (enrdf_load_html_response)
GB (1) GB1001165A (enrdf_load_html_response)
IT (1) IT713090A (enrdf_load_html_response)
NL (1) NL142561B (enrdf_load_html_response)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3612804A (en) * 1968-12-31 1971-10-12 Atomic Energy Commission Induction heating device for successive barlike members
US5183985A (en) * 1988-05-19 1993-02-02 The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland Contactless heating frequency heating of thin filaments

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT713090A (enrdf_load_html_response) * 1963-01-17

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2556236A (en) * 1946-08-31 1951-06-12 Ohio Crankshaft Co Heat-treating method and product
US2722589A (en) * 1950-11-30 1955-11-01 Ohio Crankshaft Co Method and apparatus for uniformly heating intermittently moving metallic material
US2853588A (en) * 1957-05-17 1958-09-23 Westinghouse Electric Corp Workpiece handling apparatus
GB1001165A (en) * 1963-01-17 1965-08-11 Philips Electronic Associated Improvements in or relating to inductive heating devices

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2556236A (en) * 1946-08-31 1951-06-12 Ohio Crankshaft Co Heat-treating method and product
US2722589A (en) * 1950-11-30 1955-11-01 Ohio Crankshaft Co Method and apparatus for uniformly heating intermittently moving metallic material
US2853588A (en) * 1957-05-17 1958-09-23 Westinghouse Electric Corp Workpiece handling apparatus
GB1001165A (en) * 1963-01-17 1965-08-11 Philips Electronic Associated Improvements in or relating to inductive heating devices

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3612804A (en) * 1968-12-31 1971-10-12 Atomic Energy Commission Induction heating device for successive barlike members
US5183985A (en) * 1988-05-19 1993-02-02 The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland Contactless heating frequency heating of thin filaments

Also Published As

Publication number Publication date
GB1001165A (en) 1965-08-11
CH414031A (de) 1966-05-31
IT713090A (enrdf_load_html_response)
NL6400194A (enrdf_load_html_response) 1964-07-20
NL142561B (nl) 1974-06-17

Similar Documents

Publication Publication Date Title
US3472987A (en) Process for heating by induction
US2052010A (en) Induction heating apparatus
US2461323A (en) Induction heater for use with pipe bending apparatus
US2545370A (en) Method and machine for making rubber coated steel belts
RU2663915C1 (ru) Устройство непрерывного нагрева для спиральных пружин и метод нагрева спиральных пружин с использованием того же устройства
US2513778A (en) Heat-treating apparatus
US3301990A (en) Work coil for induction heating
US2470311A (en) Rotary conveyer
US2779848A (en) Machine for electronic processing of dielectric articles
US2476935A (en) Induction heating apparatus
US1747934A (en) Apparatus for hardening products of iron, steel, and other ferromagnetic materials
US2467201A (en) High-frequency induction heating coil
US2512893A (en) Induction heating and quenching apparatus
KR20180041393A (ko) 철재 유도가열 가공시스템
US3674247A (en) Apparatus and method of inductively heating and quench hardening an elongated workpiece
US3684851A (en) Apparatus and a process for inductively heating workpieces
GB1394200A (enrdf_load_html_response)
US3372261A (en) Apparatus for heating an elongated metal workpiece
US2408190A (en) Magnetic induction heating of thinwalled nonmagnetic metallic tubes
US11009328B1 (en) Ammunition case mouth sealing system and related method
US2468796A (en) Method of and apparatus for dual coil induction heating
US3556491A (en) Apparatus for inductive heating of cylindrical members
US2457179A (en) Coreless induction heater and method of making same
US2781438A (en) Electrical heating apparatus
US2937017A (en) Apparatus for heating metal articles of irregular shape