共查询到20条相似文献,搜索用时 62 毫秒
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正德国EMG集团与塔塔钢铁集团共同开发了一种光学摄像系统,即hotCAM,用于对热轧板坯和带材位置及弯曲度的监测。带钢在机架之间保持确定的位置对于热轧过程安全十分重要。对带钢位置的连续监测可使轧制力和辊缝的调节最佳化,减少带钢的弯曲度,防止带钢与导卫装置的碰撞。hotCAM将带钢边部的位置数值以±2mm的精度连续输入到控制系统,操作人员可以采用这些信息进行闭环控制 相似文献
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分析了欧美直接轧制技术的主要对策,针对速度补偿、温度补偿、缓冲,过程控制和性能预报等措施加以论述,提出可行的直接轧制方案。 相似文献
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Subpixel accuracy for V-groove center in robot welding is researched and a software measure to increase the accuracy of seam tracking by laser is presented. LOG ( Laplacian of Gaussian ) operator is adopted to detect image edge. Vgroove center is extracted by corner detection of extremum curvature. Subpixel position is obtained by Lagarange polynomial interpolation algorithm. Experiment results show that the method is brief and applied, and is sufficient for the real time of robot welding by laser sensors. 相似文献
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The magnetic flux leakage (MFL) method has very good defect detection and location capabilities, but defect sizing capabilities, especially for sub-surface defect characterisation, are limited. The pulsed magnetic flux leakage (PMFL) technique has recently been introduced and shown to have great potential for automated defect sizing for surface-breaking defects using time-frequency signal processing techniques, but sizing of sub-surface defects has proved problematic. In this paper, pulsed magnetic reluctance (PMR), a new electromagnetic (EM) non-destructive evaluation (NDE) technique, is introduced and incorporated into a dual PMFL/PMR probe for the characterisation of surface and sub-surface defects in ferromagnetic materials. Experimental results from a comparison study of the two techniques using variety of defects analysed using time-frequency analysis show that the techniques offer complementary information, with PMFL providing defect location data and data for the characterisation of surface defects and PMR offering sub-surface defect characterisation capabilities. The work concludes that integration of these inspection techniques in the new pulsed EM probe can provide enhanced defect characterisation capabilities for flux leakage-based inspection systems using relatively simple time-frequency signal processing techniques. 相似文献
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针对秦皇岛首秦金属材料有限公司4 300 mm生产线主轧机在使用过程中出现的异常振动、异响、钢板跑偏甩弯问题,利用精密摄影测量系统、精密全站仪等检测技术对主轧机空间位置进行检测,通过对检测数据的分析发现设备在空间位置上存在超出标准的偏差,采取措施后取得了良好效果。 相似文献
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焊缝边缘检测技术是图像分析、图像理解的最基本操作之一,也是焊接机器人实现焊缝跟踪的关键技术之一。基于梯度直方图提出一种焊缝边缘检测方法,将二维高斯滤波器分为水平和竖直方向的一维高斯滤波器对图像进行平滑处理,然后用一种改进的梯度计算方法来计算梯度和确定像素点梯度方向。最后采用梯度统计量进行阀值选取,并结合非极大值抑制得到单像素宽的边缘图像。将二维高斯函数和梯度的计算由二维降到一维,减少了计算量,同时由于不同的梯度值直接与相应的方向对应,因而在后续的处理中无须再进行梯度方向的计算,提高运算的效率,阈值选取具有一定的稳定性。运用MATLAB软件对图像进行处理,对比经各种算法处理的焊缝图像说明该算法具有较好的适应性和鲁棒性。 相似文献
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The purpose of this study is to develop a three-dimensional coupled thermo-elastic-plastic finite element model of nonisothermal
rolling and analyze the strip curvature caused by the difference in the heat transfer boundary conditions of the upper and
lower rollers. The difference in the rotation speed between the upper and lower rollers was utilized in an attempt to correct
the aforementioned curvature in hot rolling due to unsymmetrical cooling conditions. In addition, the changes in shape, temperature
field, and strain field of the strip during the various stages were analyzed and can be used to obtain the lateral plastic
flow of the strip. As for the aspect of heat transfer, the various possible boundary conditions in the actual hot rolling
were considered, which include the convection boiling of the air and water, and the radiation loss. Then, the three-dimensional
finite difference heat transfer equation is derived according to the concept of heat balance. As for the determination of
the direction of tangential friction force, this study also developed a modification algorithm to adjust to the three-dimensional
rolling process. After a comparison with the experimental data in Ref 8 and 15, and the simulated temperature distribution
in Ref 17, the partial results obtained from the computation by the numerical analytical model verify that the theoretical
model and computer programs established in this study are reasonable. This study shows that hot rolling can greatly reduce
the rolling force and strain rate with the early appearance of plastic deformation, and the distribution of temperature field
is basically affected by the heat transfer boundary conditions. However, unsymmetrical heat transfer boundary conditions will
cause unsymmetrical rolling forces of the upper and lower rollers and cause strip curvature; this condition can be corrected
by the difference in the rotation speed of the rollers. 相似文献
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Pulse thermographic nondestructive evaluation (TNDE) technique can be used to estimate defect dimensions, and in particular the depth at which the defect is located. Numerical models of this procedure can aid in the interpretation of experimental results. However, the thermophysical properties of the test object as well as the amount of energy absorbed during this process are not readily available for such models. This paper presents an extension of the thermographic signal reconstruction (TSR) procedure in which the temperature and the time scales are respectively normalized with equilibrium temperature and the break time. In the normalized form these profiles are independent of material properties and instrumentation settings. Thus in the normalized format, experimental results can be readily compared with numerically generated thermographic results. The defect depth can also be easily obtained as a fraction of plate thickness from this plot. 相似文献
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基于超声小角度纵波检测技术,采用非接触聚焦直探头,调节合适的声束入射方向,提取钎焊界面的超声反射信号,利用超声信号特征幅值来识别缺陷并完成超声成像,判断钎焊界面是否存在缺陷。3种样品的钎焊界面状态分别为焊接良好、存在人工缺陷和存在工艺缺陷,且检测样品表面所在平面与钎焊界面所在平面的夹角均为7°。检测结果表明:针对检测样品的最佳入射角α为4°,该方法可有效检出当量直径2.0 mm人工缺陷和钎焊界面工艺缺陷,成像结果能够准确并直观地判断出钎焊界面缺陷。最后,通过检测样品解剖分析验证了小角度超声纵波检测技术对钎焊界面缺陷检测的准确性。 相似文献