| 摘要 |
<p>PURPOSE:To minimize the bending of a material to be hardened and to execute induction hardening by measuring continuously the bending of said material which has an approximately square sectional shape and controlling the flow rate of a cooling liquid in accordance with the direction and rate of the bending. CONSTITUTION:The surface of a work 1 having approximately the square sectional shape is heated to a prescribed temp. by a coil 11 for induction hardening in common use as the 1st cooler and is further cooled by a cooling liquid injected from a nozzle hole 111 while said work is moved toward an arrow A. The bending in the X- and Y-axis directions of the work 1 under the hardening is detected by sensors 9, 13 having detecting parts 8, 12. Solenoid valves 4, 6 are controlled via means 5, 7 for driving solenoid valves by a control means 10 in accordance with the detection signal and the flow rate of the cooling liquid supplied from the pumps 14, 15 of the 2nd coolers 2, 3 facing the four faces of the work 1 is controlled according to the direction and rate of the bending.</p> |
