| 摘要 |
PURPOSE:To perform efficient and automatic quick spheroidizing heat treatment of plural steel bars having a large diameter and a specified length by performing all the operations for feeding successively the steel bars from a feed chute to an induction heating furnace, heating the same to a prescribed temp., taking the bars from the furnace, and supplying the same to an isothermally holding device by means of timers. CONSTITUTION:Many steel bars 19 on a feed chute 3 are put by each piece into a coil-shaped quick induction type heater 5 by the 1st pusher 2. The bars 19 are heated to 800 deg.C in the heater 5 and are pushed out by the succeeding bars so as to be moved onto a chain conveyor 8 until the bars stop moving by contacting with a stop plate 9. The bars are transferred by the 2nd pusher onto a steel bar receiving and transferring part 11 where an open/shut door 16 is opened and are stored in an isothermally holding device 13. The steel bars are held at 700 deg.C in said device and are subjected to a softening heat treatment by spheroidization. The above-mentioned operations are automatically accomplished by means of timers T1-T4. Thus, the quick softening heat treatment of many steel bars is efficiently accomplished. |
