METHOD OF INDUCTION HEATING OF LONG-LENGTH PRODUCTS Russian patent published in 2008 - IPC H05B6/02 

FIELD: physics.

SUBSTANCE: according to invention method of induction heating of long-length products including heating a product reciprocating in the furnace consisting of a number of inductors coaxially and serially located along axis with inductor-to-inductor clearances containing elements providing support and moving of product, implies that product is placed in the furnace consisting of identical inductors of length L_ind spaced with equal inductor-to-inductor clearances L_clear. Further on, heating and reciprocating of product is performed, heating being carried out at equal and constant current passing through all the inductors during one motion cycle, as well as at position of product in the furnace during whole period of heating and continuous reciprocating at rate υ, delay time in extreme positions t_d and equal in both directions amplitude A corresponding to relation A=L_ind+L_clear-t_d×υ. Preset temperature being reached and product motion cycles in integral number being over, motion is stopped and heating is disconnected.

EFFECT: possibility of uniform precision (accurate) heating of product.