A reduction of the unevenness of a temperature increase at the end of heating work can be achieved without specific equipment, and with securing the shortening of the working time, which is an advantage of a bulk heating.When a region to be heated of an article made of a thin sheet is heated inductively so that the whole region thereof reaches a temperature equal to or more than a target temperature using an inductive portion of a heating inductor, to which a high-frequency current is applied by...

The device for heating by electromagnetic induction of a metal strip (A) comprises at least one inductor coil (B) which surrounds an area of the strip in a transversal manner in relation to the longitudinal direction of the strip. The coil (B) comprises at least one monoturn (1) whose median plane (P) is orthogonal in relation to the longitudinal direction (D) of the strip.

An elongated substrate may be heated in a roll processing system. At least a portion of the elongated substrate is loaded into the roll processing system. A sufficient electrical current is caused to flow in the portion of the elongated substrate to heat the portion to a desired temperature. The heating may be either resistive or inductive. The roll processing system may be a roll-to-roll type where the substrate moves as a portion of it is heated. Alternatively, the substrate may be wound into ...

An apparatus and process are provided for inductively heating a workpiece to a desired cross sectional temperature. At least one pair of coils form a transverse flux inductor. The workpiece is located between the pair of opposing coils, which are oriented across the cross section of the workpiece. Each coil comprises a plurality of coil sections. The distance between one or more opposing coil sections is adapted to achieve the desired cross sectional induction heating temperature profile in the ...

The invention concerns heating metal strips or other coilable strand metal object to an elevated temperature, wherein the metal object is passed in a heating section through a furnace chamber that is made at least partly of an insulating and electrically non-conductive material while being heated through transverse flux induction heating (TFIH) by transverse flux induction heating elements located outside of the chamber which contains a protective non-oxidizing gas or gas mixture. The metal obje...

A method for preparing large cast iron dies for use in pressing the sheet-metal components of vehicle bodies is described; this method results in improved pressing performance, such as extended life and, in particular, drastic reduction in rejects and stoppages due to seizure; its main characteristic consists of subjecting to induction hardening treatment those die regions most subject to operational wear.

A process is disclosed and claimed for producing a graft copolymer composition, (e.g., polyether). The composition is prepared by adding and mixing more than an equivalent of an aliphatic polyether polymer with a polymer having an acid ester, acid anhydride, alcohol ester or acetal or alcohol group side chain, in the presence of a solvent solution. The mixture is then heated and a Lewis acid is added under agitation. The graft copolymer compositions are useful in molding applications.

An apparatus for the induction heating of metal sheets. The apparatus comprises generally an alternating current generator, an inductor connected to the generator, and a guideway for the metal sheets to be heated passing through the inductor in a direction such that the lines of force of the magnetic field are parallel to the guideway and to themselves inside the guideway. The inductor is made in the form of a curved loop having two arms and surrounding the guideway. The loop consists of at leas...

An apparatus and a method for induction heating of pieces or blanks (10) of electrically conducting and non-magnetic material, wherein a device creates a static magnetic field (3) and a second device is arranged to cause a relative movement (4) between the piece or blank (10) and the static magnetic field (3), so that current is induced (12) in the piece or blank (10) which thereby is being heated up.

An edge-region heating device for use in the hot rolling of metallic strip after some cooling of the strip has occurred, employs an induction heater to preferentially raise the temperature of the edge-regions of the strip to compensate for the faster cooling of these edge regions whereby a more uniform temperature is obtained over the cross-section of the strip when a later hot rolling operation is performed.