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宽厚板七辊预矫机是提高板带平直度、均匀或减小残余应力分布的重要环节,其矫直水平直接决定了产品质量。以宽厚板实际变形情况为背景,通过研究材料变形与各道次下的弯曲曲率及弯曲挠度之间的关系,对负扭矩的产生原因进行了分析;与此同时采用应变电桥法对七辊预矫过程中传动轴扭矩测试信号进行了分析,并通过有限元模拟进行对比分析。研究结果表明:负扭矩的产生是由于集中驱动所提供的同一转速与压弯量不同形成的不均一速度,二者无法适应引起的;负扭矩导致各个辊负载扭矩重新分配,最终对矫直辊面造成损伤;并在此基础上优化矫直工艺参数,将第二台电机的转速提高30%后,6号辊负扭矩现象得到缓解,3号和5号辊扭矩剧增现象得以消除,矫后板平直度得到改善,矫后残余应力分布更加均匀。
Heavy plate seven roller pre-straightening machine is to improve the strip flatness, uniform or reduce the residual stress distribution an important part of the straightening level directly determines the product quality. Based on the actual deformation of wide and thick plate, the cause of negative torque was analyzed by studying the relationship between material deformation and bending curvature and bending deflection under each pass. At the same time, The torque test signal of the drive shaft during roller pre-distortion was analyzed and compared by finite element simulation. The results show that the generation of negative torque is due to the non-uniform speed caused by the same rotational speed and bending deflection provided by the centralized drive, which can not be adapted. The negative torque causes the redistribution of load torque of each roller. Finally, Surface damage; and based on this to optimize the straightening process parameters, the second motor speed increased by 30%, the sixth roller negative torque was alleviated, the third and fifth roller torque surge phenomenon to be eliminated, straightening The flatness of the back plate is improved, the residual stress distribution is more uniform after correction.