Patent ID: 6399928
Filing Date: 2002-06-04
Classification: C21D,Y02P

Abstract:
An apparatus for the hardening of cylindrical bearing faces (L) of a shaft (K), wherein at least one of the transitional radii (R1, R2) to the adjoining shaft portions (W1, W2) is constructed recessed, having:a pair of inductively operating heating units (1, 2), which are each formed at least by one inductor (3, 4) having two spaced-out heating conductor branches (20, 22; 21, 23) each extending in the peripheral direction (U) of the bearing face and which are connected to a power supply (5, 6), one outer heating conductor branch (20) of the inductor (4) of one heating unit (2) being associated with the first transitional radius (R1), and an outer heating conductor branch (22) of the inductor (3) of the other heating unit (1) being associated with the second transitional radius (R2), while in each case the inner heating conductor branches (22, 23) of the inductors (3, 4) are disposed adjacent one another; an adjusting device (11, 12) for the purpose of adjusting the inductors (3, 4) simultaneously from the radial direction (R) on to the bearing face (L) to be hardened, until the inductors (3, 4) are applied to the bearing face (L), the heating conductor branches (20-23) engaging at least partially around the bearing face (L) in this state, and the inner heating conductor branches (22, 23) of the two inductors (3, 4), viewed in the peripheral direction (U), registering contactlessly with one another in an overlap zone (B), and a second adjusting device (13, 14) for the purpose of moving at least the inductor (3, 4) associated with the recessed radius (R1, R2) after application to the bearing face (L) by a movement directed axis-parallel with the longitudinal axis (X) of the shaft (K) in the direction of the recessed transitional radius (R1, R2), until its outer heating conductor branch (20) has moved into the particular transitional radius (R1, R2).