Induction heating and quenching of rolls for cold rolling mills - where spray quenching tank is located below induction furnace

摘要

The roll is in a vertical position when it is inserted in an induction heating furnace located above a support (a) on which the roll rests. Support (a) canm be driven vertically, and includes a motor rotating the roll in the furnace to ensure uniform heating. After the roll has reached the required temp., support (a) is lowered to the bottom of a quenching tank which is below, but coaxial with, both support (a) and the furnaces. The pref. quenching tank contains vertical rows of water spraying nozzles employed for water quenching the surface of the roll while the latter is still rotated on its vertical axis. The pref. support (a) includes a housing with a blind hole in which the lower roll journal rests, the motor rotating the housing; and motor-driven chains raise or lower support (a). The entire hardening process can be accurately controlled with the min, amt. of skilled labour, to obtain a thick hard skin on the roll.