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Publication numberUS3705284 A
Publication typeGrant
Publication dateDec 5, 1972
Filing dateFeb 24, 1970
Priority dateFeb 27, 1969
Publication numberUS 3705284 A, US 3705284A, US-A-3705284, US3705284 A, US3705284A
InventorsPierre C Binard
Original AssigneeElphiac Sa
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Inductor for the thermal treatment of a material which is not very or non-electrically conducting containing ferromagnetic or electrically conductive particles
US 3705284 A
Abstract
An inductor for use in the thermal treatment of a material which is not very or non-electrically conducting containing ferromagnetic or electrically conductive particles. The inductor forms, in combination with the insulation between its conductors, a mold in which the material containing ferromagnetic or electrically conductive particles is submitted to the thermal treatment.
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Description  (OCR text may contain errors)

United States Patent Binard 3,705,2 4 Dec. 5, 1972 2,875,556 Vigna'et a1. 3,126,937 3/1964 Brower et a1.

INDUCTOR FOR THE THERMAL 219/1057 x .219/7.s x .219/10.49 x ........219/1o.s3 x ........219/1o.41x .......219/1o.s3 x

.. ....l8/38 X .......18/38 x ...219/10.ss

TREATMENT OF A MATERIAL WHICH IS NOT VERY OR NON- l,380,2-50 5/1921 Reymond ELECTRICALLY CONDUCTING 2,372,929 1945 CONTAINING FERROMAGNETIC ()R 2,393,541 1/1946 Kohler....... ELECTRIC ALLY CONDU 2,438,952 4/ 1948' Grotenhuis PARTICLES 2,581,939 1/1952 Deist [72] I t 9/1952 Seifried nven or:

2,611,152 Pierre C. Blnard, Embourg, Belgium 2,738,406 3,391,846

3/1956 Zaleski...............

7/1968 White.........

[73] Assignee: Elphiac, Bruxelles, Belgium [22] Filed:

1970 Primary Examiner-J. V. Truhe Assistant Examiner-Hugh D. Jaeger Att0rneyRaymond A, Robic [21] Appl. No.: 13,434

ABSTRACT [30] Foreign Application Priority Data Feb. 27, 1969 Belgium....,.............................70,585

tive particles. The inductor forms, in combination with the insulation between its conductors, a mold in which the material containing ferromagnetic or electrically conductive particles is submitted to the thermal treatment.

[51] Int..-Cl.........

8 Claims, 3 Drawing Figures [5 6] References Cited UNITED STATES PATENTS 2,014,332 9/1935 Houlette...........................219/535 X 7/ 1 w ti 2 USN PATENTEDHEI: 51972 FIG.2

INVENTOR Pierre '6. BINARD ATTORNEY PATENTEDun: sum V A 3.705.284

' sum 2 or 2 FIG. 3

INVENTOR Pam c. BINARD INDUCTOR FOR THE THERMAL TREATMENT OF A MATERIAL WHICH IS NOT VERY OR NON- ELECTRICALLY CONDUCTING CONTAINING FERROMAGNETIC OR ELECTRICALLY CONDUCTIVE PARTICLES The invention relates to an inductor for'use in the thermal treatment of a material which is not very or non-electrically conductive containing ferromagnetic or electrically conductive particles.

It is known in the art to incorporate powders of magnetite, of ferromagnetic metals, or of electrically conductive materials in substances which are not very or non-electrically conductive and to submit these mixtures to an electromagneticalternating field so as to heat them in order to render them fluids, to vulcanize them, to polymerize them or to dry them etc.-

The object of the invention is to provide an inductor for use with such a known process, wherein the thermal treatment of the material containing ferromagnetic or electrically conductive particles is carried out in'a receptacle such as a mold, the chamber of a screw type pump, a dye etc. v

The inductor, in accordancewith the invention, is characterized in that it forms, in combination with the insulation between its conductors, the mold in which the material containing ferromagnetic or electrically conductive particles is submitted to the thermal treatment.

The invention will now, be disclosed with reference to two embodiments thereof and to the accompanying drawings in which:

FIGS. 1 and 2 illustrate similar arrangements of a first inductor in accordance with the invention; and

FIG. 3 illustrates a second embodiment of aninductor in accordance with the invention.

In FIG. 1, there is shown two half molds l and 2 which are electrically conductive and made of, for example, cast aluminum. The half molds have roughly the shape of a hollow torus separated in two through its plane of symmetry perpendicular to the axis 3 thereof. However, the two half molds are not necessarily perfectly 'symmetricaL'An insulating ring 4is positioned between the two inside mating edges of the half molds 1 and 2 and provides an electrical insulation between the current feeding conductors. The ring 4 includes an opening therein through which may petrude a pipette (not shown) for permitting to build up a pressure the two half molds once assembled. The insulating ring 4 may be made of an elastomer which is resistant to high temperatures. The outside mating edges of the two half molds l and 2 include means to ensure a good electrical contact between such edges such as, for example, a small projection 5 on the half mold 2 along the inside circumference thereof. When the two half molds 1 and 2 are made of aluminum, the contact surface of projection 5 and the opposite contact surface of the half mold l are coated with a thin layer of a material the conducting properties of which are not impaired by sulphur such as, for example, gold.

It is also possible to provide a series of contact springs 6 located at equal distances along the inside circumference of the outside edge of one of the two half molds such as, for example, the half mold 2 as illustrated in FIG. 2. These contact springs 6 may be made of bronze and may bear on a copper band 7 inserted into the other half mold l.

The two half molds l and 2 are connected at their inside edges to two high frequency current feeding conductors 8 and 9. These conductors may consist of two sleeves providing a uniform electrical contact along the inside edge of each half mold or may consist of a number of contact fingers equally spaced along the inside edges of the half molds.

The high frequency current is generated, preferably, by a transformer 10 located adjacent to the torus. In accordance with a first embodiment, which is particularly advantageous for the manufacture of vehicle tires, the transformer 10 is a toroidal transformer comprising an inside primary winding made of a number of turns of conductors and an outside secondary winding 12 consisting of a torus cut along two parallel circles and welded at the location of such cut to the two sleeves 8 and 9. The sleeve 9 may be permanently connected to half mold 2 by means of screws, for example, protruding through a flange 13 of the sleeve, while the edge of the other sleeve 8, which is to contact the half mold 1, may be slit so as to form a number of contact fingers 14 which are applied against the half'mold 1 by means of :1 conical piston 15 operated by a pneumatic device 16.

Inside the hollow torus, there are provided shaped pieces made of an electrically non-conducting material which is'also heat resistant. Such pieces may be made, for example, of a material known under the trade mark Araldite containing quartz and resistant to at least C. It is also possible to make such pieces of a thermosetting material containing a ferromagnetic or electrically conductive powder. In addition, these pieces may be reinforced by glass fibers or by textiles of the same material.

In FIG. 3, there is shown an alternative embodiment of the invention.

In such embodiment, a spiral inductor having a solid conductor 17 is surrounded by a layer of an insulating material 18 such as, for example, polytetrafluorethylene known under the trade mark Teflon. The insulating material 18 fully surrounds the conductor 17 and has an inside surface which is suitable for a mold. The assembly of the inductor and of the insulating material is supported by a reinforcing outside tube 19 made of, for example, porcelain. Such tube 19 may be replaced by the jaws of a clamping tool since the use thereof is to prevent inductor 17 from opening up when a pressure is established inside the mold. When the pressure is nil or very low, outside clamping means such as tube 19 are not necessary. In order to permit molding inside inductor 17, a lower piston 20 and an upper piston 21 are provided. These pistons may be made, preferably, of a material which is electrically and thermally insulating. However, it is also possible to provide pistons which are electrically conducting or having sufficient magnetization losses to produce about the same amount of heating than that produced in the material to be treated.

It is also possible to provide a conductor 17 which is 1 hollow so as to permit circulation of water or vapor inside the conductor, in order to always maintain the conductor at a predetermined temperature which may be chosen to be about equal to that of the material undergoing a thermal treatment inside the inductor.

I claim:

1. An inductor for use in the thermal treatment of a material which is relatively poorly electrically conducting shaped pieces located inside the half molds and made of a thermosetting material which is non electrically conducting.

3. An inductor as defined in claim 2, wherein said thermosetting material is Araldite which is resistant to at least 150C.

4. An inductor as defined in claim 1, wherein the means ensuring a positive electrical contact between the outside edges of said half molds comprise contact springs located at equal distances along the inside cirprojection along the inside circumference of the out-- side edges of sad half molds.

6. An inductor as defined in claim 5, wherein a thin coating of a metal the conducting properties of which are not impaired by sulphur are disposed along the mating outside edges of said half molds.

7. An inductor as defined in claim 1, wherein said high frequency current source comprises a transformer having a primary winding and a secondary winding located adjacent to the torus formed by said half molds, and wherein the current conductors connected to the inside edges of said half molds are the ends of the secondary winding of said transformer.

8. An inductor as defined in claim 13, wherein said transformer is a toroidal transformer which is connected to said half molds by means of two concentric sleeves.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1380250 *Oct 22, 1919May 31, 1921Martin H ReymondProcess of molding or shaping parts in molds or dies
US2014332 *Oct 29, 1934Sep 10, 1935Pharis Tire And Rubber CompanyApparatus for vulcanizing rubber
US2372929 *Apr 1, 1941Apr 3, 1945Rca CorpComposite structure
US2393541 *May 21, 1943Jan 22, 1946Induction Heating CorpComposition adapted for inductive heating and method for using same
US2438952 *Apr 20, 1944Apr 6, 1948Gen Tire & Rubber CoMethod for curing pneumatic tires
US2581939 *Jul 5, 1947Jan 8, 1952Firestone Tire & Rubber CoMold for electronic vulcanization
US2611152 *Dec 1, 1951Sep 23, 1952Goodrich Co B FVulcanization of tires with highfrequency fields and apparatus therefor
US2738406 *Sep 20, 1951Mar 13, 1956Gen Precision Lab IncRadio frequency vulcanizing
US2875556 *Jul 31, 1953Mar 3, 1959Vig CorpApparatus for molding refractory materials
US3126937 *Feb 15, 1962Mar 31, 1964Gen Dynamics CorpForming method and apparatus therefor
US3391846 *Apr 2, 1964Jul 9, 1968Du PontHeating with antiferromagnetic particles in a high frequency magnetic field
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4571472 *Dec 24, 1984Feb 18, 1986Ab Akerlund & RausingDevice for induction welding
US4749833 *Aug 7, 1987Jun 7, 1988Tocco, Inc.Induction heating for adhesive bonding
US5530227 *Dec 16, 1993Jun 25, 1996The Boeing CompanyMethod and apparatus for consolidating organic matrix composites using induction heating
US5571436 *Apr 17, 1995Nov 5, 1996The Boeing CompanyInduction heating of composite materials
US5591369 *Jun 5, 1995Jan 7, 1997The Boeing CompanyMethod and apparatus for consolidating organic matrix composites using induction heating
US5591370 *Jun 5, 1995Jan 7, 1997The Boeing CompanySystem for consolidating organic matrix composites using induction heating
US5599472 *Nov 18, 1994Feb 4, 1997The Boeing CompanyResealable retort for induction processing of organic matrix composites or metals
US5624594 *Jun 6, 1995Apr 29, 1997The Boeing CompanyFixed coil induction heater for thermoplastic welding
US5641422 *Jun 16, 1995Jun 24, 1997The Boeing CompanyThermoplastic welding of organic resin composites using a fixed coil induction heater
US5645744 *Jun 6, 1995Jul 8, 1997The Boeing CompanyRetort for achieving thermal uniformity in induction processing of organic matrix composites or metals
US5683607 *Aug 14, 1996Nov 4, 1997The Boeing Companyβ-annealing of titanium alloys
US5683608 *Jun 5, 1995Nov 4, 1997The Boeing CompanyCeramic die for induction heating work cells
US5700995 *Mar 17, 1995Dec 23, 1997The Boeing CompanySuperplastically formed part
US5705794 *May 26, 1995Jan 6, 1998The Boeing CompanyCombined heating cycles to improve efficiency in inductive heating operations
US5710414 *Jun 6, 1995Jan 20, 1998The Boeing CompanyInternal tooling for induction heating
US5728309 *Jun 6, 1995Mar 17, 1998The Boeing CompanyMethod for achieving thermal uniformity in induction processing of organic matrix composites or metals
US5747179 *Jun 5, 1995May 5, 1998The Boeing CompanyPack for inductively consolidating an organic matrix composite
US5808281 *Jun 6, 1995Sep 15, 1998The Boeing CompanyMultilayer susceptors for achieving thermal uniformity in induction processing of organic matrix composites or metals
US5821506 *May 22, 1997Oct 13, 1998The Boeing CompanySuperplastically formed part
US5847375 *Jul 19, 1996Dec 8, 1998The Boeing CompanyFastenerless bonder wingbox
US5895854 *Nov 8, 1996Apr 20, 1999Continental AktiengesellschaftVehicle wheel provided with a pneumatic tire having therein a rubber mixture permeated with magnetizable particles
US6211497Jun 5, 1995Apr 3, 2001The Boeing CompanyInduction consolidation system
US6308758Jul 6, 1999Oct 30, 2001Continental AgElastomeric tire having magnetized sidewall and method of manufacturing same
US6660122Sep 4, 1998Dec 9, 2003The Goodyear Tire & Rubber CompanyInduction curable tire components and methods of selectively curing such components
US7126096Jun 6, 1995Oct 24, 2006Th Boeing CompanyResistance welding of thermoplastics in aerospace structure
Classifications
U.S. Classification219/634, 156/110.1, 219/649, 219/670, 425/174
International ClassificationF27D11/06, H05B6/36, H05B6/10
Cooperative ClassificationB30B15/34, B30B15/022, F27D11/06, H05B6/365
European ClassificationH05B6/36D, F27D11/06, B30B15/02B, B30B15/34