US2537289A - Device for heating pieces of work by means of high-frequency alternating currents - Google Patents

Device for heating pieces of work by means of high-frequency alternating currents Download PDF

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Publication number
US2537289A
US2537289A US727030A US72703047A US2537289A US 2537289 A US2537289 A US 2537289A US 727030 A US727030 A US 727030A US 72703047 A US72703047 A US 72703047A US 2537289 A US2537289 A US 2537289A
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United States
Prior art keywords
work
piece
frequency alternating
coil
pieces
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Expired - Lifetime
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US727030A
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English (en)
Inventor
Hendrik Johannes Meerka Embden
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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    • 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
    • H05B6/365—Coil arrangements using supplementary conductive or ferromagnetic pieces

Definitions

  • the invention relates to high-frequency induction heating apparatus.
  • the known devices for heating metal pieces of work by means of high-frequency alternating currents for the thermal treatment of pieces or work comprise a coil for conducting the high-frequency alternating currents. In the space inside this coil there is produced a high-frequency alternating field by which the outer layer of the piece of work brought into this field is heated through induction of Foucault currents.
  • the efficiency of such a device is highly dependent on that portion of the magnetic alternating field produc'ed in the coil which is used efficiently for the production of Foucault currents in the piece of work, that is to say on the part of the field which crosses this piece of work.
  • the coil will have much larger dimensions than the piece of work introduced, since in view of the high voltages to be used it is desirable that the dimensions of the coil and the distance between its turns should be such that in many cases the coil is necessarily of an excessive size. A great portion of the magnetic field produced will therefore not pass through the piece of work.
  • flexible turns for the coil producing the highfrequency field, so that these turns may be adapted to pieces of work of difierent shapes. There are, however, objections from the point of View of construction, since these turns generally have to conduct comparatively strong currents and mostly have to be cooled by a water current.
  • a known solution to meet the above-mentioned drawback of the dimensions of the coil relative to the piece of work while retaining a comparatively large coil consists in the provision of a filling piece of non-magnetic material having a high electrical conductivity between the coil and the piece of work concerned.
  • Such known filling pieces consist of brass or copper bodies provided with a central aperture which communicates with the outer periphery by means of a slot.
  • This exact adaptation has the advantage of a minimum leakage field.
  • Figures 1 and 2 give a plan view and a sectional side view of the device according to the invention.
  • the coil 1 contains a body which is constituted by two parts 2 and 3 which parts may be cooled, said body consisting of non-magnetic material of good electrical conductivity, for example of copper.
  • a high frequency alternating field is produced in the coil I.
  • Foucault currents are produced in the parts 2 and 3, which flow in accordance with the indicated arrows owing to the edge efiect.
  • the piece of Work which must be externally hardened is located in the aperture 4 between the two pieces 2 and 3, about which also flows a high-frequency alternating current, as can be seen from the drawing.
  • Fig. 2 is a sectional view of a device according to the invention.
  • I is the coil traversed by the high-frequency alternating current.
  • the part 8 of this piece of work need not be hardened and is therefore located outside the space 4.
  • the inclined holes 5 and 6 the current flowing directly about the piece of work is concentrated still further, from which a quicker heating results.
  • the two parts 2 and 3 are supported by limbs 9 and ill, the piece of Workbearing on a support II. If desired, the piece of work may be rotatably arranged to facilitate a more uniform heating thereof.
  • the whole is fastened on a carrier l 2 which may be moved up and down along the longitudinal axis of the coil.
  • the carrier I2 may be lowered and the parts 2 and 3 may be turned away round the limbs 9 and [0. Owing to this possibilityof movement of the parts 2 and 3 the additional advantage is obtained that the opening 4 may be adapted to the piece of work better than with the known devices having a filling piece.
  • High-frequency induction heating apparatus for treating work pieces comprising a solenoid for establishing a high-frequency field, a nonmagnetic cylindrical body of metallic material of high electrical conductivity coaxially disposed within said solenoid, said body being constituted by a pair of spaced longitudinal segments, the work piece to be treated being disposed in the spacing between said segments, the inner surfaces of said segments being shaped to conform substantially to the contour of said work piece, whereby eddy currents induced in said segments results in a flux field threading through said work piece, and a carrier movable relative to the solenoid along the longitudinal axis thereof for holding said workpiece in the spacing between said segments, said carrier including means pivotally supporting said segments to enable insertion and removal of said work piece.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
US727030A 1944-04-26 1947-02-07 Device for heating pieces of work by means of high-frequency alternating currents Expired - Lifetime US2537289A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL855745X 1944-04-26
NL2537289X 1944-04-26
NL622023X 1944-04-26

Publications (1)

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US2537289A true US2537289A (en) 1951-01-09

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US727030A Expired - Lifetime US2537289A (en) 1944-04-26 1947-02-07 Device for heating pieces of work by means of high-frequency alternating currents

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US (1) US2537289A (en))
FR (1) FR925526A (en))
NL (1) NL61586C (en))

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2749423A (en) * 1951-08-01 1956-06-05 Hartford Nat Bank & Trust Co Device for high-frequency heating
US2759086A (en) * 1953-10-08 1956-08-14 Western Electric Co Induction heating apparatus
US2803732A (en) * 1952-01-17 1957-08-20 Sylvania Electric Prod High-speed r. f. sealing
US2953718A (en) * 1958-05-01 1960-09-20 Plasmadyne Corp Apparatus and method for generating high temperatures
US3108325A (en) * 1961-01-13 1963-10-29 Gen Dynamics Corp Forming device
US3176110A (en) * 1961-11-03 1965-03-30 Ass Elect Ind Electric induction heating device
US3277265A (en) * 1963-01-22 1966-10-04 Soc De Traitements Electrolytiques Et Electrothermiques Plasma heating systems
US3342970A (en) * 1964-02-08 1967-09-19 Siemens Ag Apparatus for crucible-free zone melting
US3515840A (en) * 1965-10-20 1970-06-02 Gti Corp Diode sealer
US4242553A (en) * 1978-08-31 1980-12-30 Samuel Berkman Apparatus for use in the production of ribbon-shaped crystals from a silicon melt
US5014769A (en) * 1989-04-17 1991-05-14 Inductotherm Corp. Induction melting of metals without a crucible
US5033948A (en) * 1989-04-17 1991-07-23 Sandvik Limited Induction melting of metals without a crucible

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1997741A (en) * 1933-05-02 1935-04-16 Ajax Electrothermic Corp Muffle inductor electric furnace
US2299934A (en) * 1940-12-16 1942-10-27 Chrysler Corp Inductive heating apparatus and method
US2408229A (en) * 1943-04-30 1946-09-24 Rca Corp Electrical heating apparatus
US2442968A (en) * 1943-06-30 1948-06-08 Rca Corp Apparatus for simultaneously induction heating a plurality of elements

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1997741A (en) * 1933-05-02 1935-04-16 Ajax Electrothermic Corp Muffle inductor electric furnace
US2299934A (en) * 1940-12-16 1942-10-27 Chrysler Corp Inductive heating apparatus and method
US2408229A (en) * 1943-04-30 1946-09-24 Rca Corp Electrical heating apparatus
US2442968A (en) * 1943-06-30 1948-06-08 Rca Corp Apparatus for simultaneously induction heating a plurality of elements

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2749423A (en) * 1951-08-01 1956-06-05 Hartford Nat Bank & Trust Co Device for high-frequency heating
US2803732A (en) * 1952-01-17 1957-08-20 Sylvania Electric Prod High-speed r. f. sealing
US2759086A (en) * 1953-10-08 1956-08-14 Western Electric Co Induction heating apparatus
US2953718A (en) * 1958-05-01 1960-09-20 Plasmadyne Corp Apparatus and method for generating high temperatures
US3108325A (en) * 1961-01-13 1963-10-29 Gen Dynamics Corp Forming device
US3176110A (en) * 1961-11-03 1965-03-30 Ass Elect Ind Electric induction heating device
US3277265A (en) * 1963-01-22 1966-10-04 Soc De Traitements Electrolytiques Et Electrothermiques Plasma heating systems
US3342970A (en) * 1964-02-08 1967-09-19 Siemens Ag Apparatus for crucible-free zone melting
US3515840A (en) * 1965-10-20 1970-06-02 Gti Corp Diode sealer
US4242553A (en) * 1978-08-31 1980-12-30 Samuel Berkman Apparatus for use in the production of ribbon-shaped crystals from a silicon melt
US5014769A (en) * 1989-04-17 1991-05-14 Inductotherm Corp. Induction melting of metals without a crucible
US5033948A (en) * 1989-04-17 1991-07-23 Sandvik Limited Induction melting of metals without a crucible

Also Published As

Publication number Publication date
NL61586C (en))
FR925526A (fr) 1947-09-05

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