论文部分内容阅读
为研究连铸二次冷却区凝固坯壳厚度电磁超声无损检测机理,分析了连铸坯表面振痕对超声波信号的影响。利用有限元分析方法,建立螺旋线圈电磁超声换能器在连铸坯表面的电场、磁场、力场和声场的耦合模型。并以贝塞尔曲线方程模拟表面振痕,分析了表面振痕对连铸坯集肤表层的涡流、磁场、力场等分布规律的影响。实验结果验证了仿真分析中模型和仿真结果的正确性,为设计连铸过程凝固坯壳厚度电磁超声无损检测装置提供了理论参考依据。
In order to study the mechanism of electromagnetic ultrasonic nondestructive testing of the solidified shell thickness in the secondary cooling zone of continuous casting, the influence of surface vibration marks on the ultrasonic signal was analyzed. The coupled model of electric field, magnetic field, force field and sound field of spiral coil electromagnetic ultrasonic transducer on the surface of continuous casting slab was established by means of finite element analysis. The Bezier curve equation was used to simulate the surface flaw. The influence of surface flaw on the distribution of eddy current, magnetic field and force field was analyzed. The experimental results verify the correctness of the model and the simulation results in the simulation analysis, which provides a theoretical reference for the design of electromagnetic ultrasonic non-destructive testing device for the solidified shell thickness in the continuous casting process.