轧机导卫架端头异形截面的感应淬火工艺及畸变控制

Induction quenching process and distortion control of abnormity section at end of guide frame of rolling mill

研究了轧机导卫架端头部位的感应淬火工艺及畸变控制。专门制作了等比端头锻件并进行了感应器加热及冷却测试,同时进行了相关工艺试验,针对导卫架端头异形截面的硬度、畸变、开裂等风险进行了全面评估,基于端头的工艺试验结果,制定了导卫架端头感应淬火工艺方案:加热频率1.7~4 kHz,行走速度150 mm/min,功率90×(14%~24%) kW,并对感应器进行了驱磁设计,采用连续加热连续冷却感应淬火。结果表明,基于端头异形截面结构所设计的仿形感应器经工艺试验验证可实现角度40°的导卫架端头异形截面的感应淬火工艺,通过在感应器上合理设置驱磁区域,有效避免了异形截面端头发生尖角效应,并利于感应加热温度的均匀性。C35E钢端头经感应淬火后硬度达55~60 HRC,通过反畸变操作,总长2120 mm的导卫架端头弯曲畸变控制在1 mm以内。

Heat treatment process and distortion control of induction quenching at the end of the rolling mill guide frame were studied,for which the corresponding end forgings were specially made and the inductor heating and cooling tests were carried out.At the same time,the relevant process tests were carried out.The hardness,distortion,cracking and other risks of the special-shaped section of the end of the guide frame were comprehensively evaluated.Based on the process test results of the end,an induction quenching process for the end of the guide frame was developed with the heating frequency of 1.7-4 kHz,the walking speed of 150 mm/min,and the power of 90×(14%-24%) kW.The magnetic displacement was designed for the inductor,and the continuous heating and continuous cooling induction quenching was adopted.The results show that based on end profiled structure designed by copying inductors by the process test,40° guide end profiled induction quenching heat treatment can be realized.By setting the magnetic displacement area reasonably on the inductor,the sharp angle effect at the end of the noncircular section is effectively avoided,and is conducive to the uniformity of induction heating temperature.The C35E steel end after induction quenching hardness can reach 55-60 HRC.Through reverse distortion operation,the bending distortion of the end of the guide frame with a total length of 2120 mm can be controlled within 1 mm.