| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for cooling a die for width press of a hot slab that can prevent surface quality problems caused by chipping-off of the surface layer of a die while extending the service life of the die by reducing the thermal damage of the die for width press of a hot slab. <P>SOLUTION: Within a standby time tw from the end of width press of a preceding slab to the start of width press of a succeeding slab, the die is cooled until the time before thermal stress increased in the die surface layer under water cooling reaches yield stressσof the die surface layer corresponding to the temperature of the die surface layer immediately before the start of width press of the succeeding slab. Water cooling of the die is then stopped and recuperated. Water cooling is stopped until the time before the temperature of the die surface layer reaches a preceding water cooling start temperature Ts to reduce the thermal stress of the die surface layer, and during the standby time tw, water cooling until the time before reaching the yield stressσof the die surface layer and the stop of water cooling until recuperation before reaching the preceding water cooling start temperature Ts are alternately repeated. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
