A circular seam cooling nozzle and its online control system have been developed to reduce the center segregation in high carbon steel billets by decreasing the superheat of the molten steel and improving the equiaxed...A circular seam cooling nozzle and its online control system have been developed to reduce the center segregation in high carbon steel billets by decreasing the superheat of the molten steel and improving the equiaxed crystal ratio based on the numerical results. An industrial experiment has been carried out on a 150 mm× 150 mm caster to investigate the effect of the circular seam cooling nozzle on the superheat removal of the molten steel. The results show that the circular seam cooling nozzle can be used to control the casting temperature in a closed loop control system. The online control system can be effectively adapted to the variation of operating parameters. The casting lasts about 4 h and about 400 t steel is successfully produced in a continuous operation. The removal of about 14 ℃ superheat and the improvement of approximate 10% equiaxed crystal ratio can be achieved by the newly developed circular seam cooling nozzle.展开更多
为有效解决非标罐体的环形焊缝识别问题,设计了一种基于被动双目视觉的环形焊缝定位与跟踪系统。首先改善左右相机采集到图像的图像质量,运用基于霍夫变换实现动态提取感兴趣区域(Region of interest,ROI)。然后经图像处理去噪,采用基...为有效解决非标罐体的环形焊缝识别问题,设计了一种基于被动双目视觉的环形焊缝定位与跟踪系统。首先改善左右相机采集到图像的图像质量,运用基于霍夫变换实现动态提取感兴趣区域(Region of interest,ROI)。然后经图像处理去噪,采用基于二值矩阵去除预焊点的方法来去除预焊点对焊缝识别的干扰,运用最小二乘法补全焊缝信息,拟合焊缝直线。接着利用改进后的双目视觉模型和基于极线的立体匹配方式,将环形焊缝细分为多个焊缝小区间内的直焊缝处理,计算并得到环形焊缝上焊点的空间坐标。实验结果表明,该系统平均误差为0.14 mm,并且可以准确地识别焊缝位置,验证了系统具有良好的精度。展开更多
基金Item Sponsored by National Basic Research Program of China (2004CB619107)
文摘A circular seam cooling nozzle and its online control system have been developed to reduce the center segregation in high carbon steel billets by decreasing the superheat of the molten steel and improving the equiaxed crystal ratio based on the numerical results. An industrial experiment has been carried out on a 150 mm× 150 mm caster to investigate the effect of the circular seam cooling nozzle on the superheat removal of the molten steel. The results show that the circular seam cooling nozzle can be used to control the casting temperature in a closed loop control system. The online control system can be effectively adapted to the variation of operating parameters. The casting lasts about 4 h and about 400 t steel is successfully produced in a continuous operation. The removal of about 14 ℃ superheat and the improvement of approximate 10% equiaxed crystal ratio can be achieved by the newly developed circular seam cooling nozzle.
文摘为有效解决非标罐体的环形焊缝识别问题,设计了一种基于被动双目视觉的环形焊缝定位与跟踪系统。首先改善左右相机采集到图像的图像质量,运用基于霍夫变换实现动态提取感兴趣区域(Region of interest,ROI)。然后经图像处理去噪,采用基于二值矩阵去除预焊点的方法来去除预焊点对焊缝识别的干扰,运用最小二乘法补全焊缝信息,拟合焊缝直线。接着利用改进后的双目视觉模型和基于极线的立体匹配方式,将环形焊缝细分为多个焊缝小区间内的直焊缝处理,计算并得到环形焊缝上焊点的空间坐标。实验结果表明,该系统平均误差为0.14 mm,并且可以准确地识别焊缝位置,验证了系统具有良好的精度。
