共查询到19条相似文献,搜索用时 819 毫秒
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针对目前常用的钢板表面检测系统在检测三维缺陷时存在的局限性,提出了一种基于数字条纹投影的三维缺陷检测方法,并构建了检测系统的数学模型,首先通过面阵CCD相机采集由表面三维缺陷引起的投射条纹形变图像,然后使用旋滤波算法对条纹图像预处理,并通过傅里叶变换轮廓术算法实现对条纹相位的提取,最终利用数学模型推导出条纹相位与缺陷深度的关系,进行钢板表面三维缺陷的在线检测.试验结果表明,该方法在准确检出钢板表面三维缺陷(凹坑或凸包)的同时较好地解决了钢板在传送中的振动及二维缺陷干扰等问题. 相似文献
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连铸板坯轧制中板的表面缺陷 总被引:7,自引:0,他引:7
对连铸板坯轧制中板表面缺限进行了分析,根据产生原因可分为有含有非金属夹杂的气囊表面缺陷;不含有非金属夹杂的气囊表面缺陷;由气泡产生的“雨点”状表面缺陷;“鱼鳞”状表面缺陷,“山水画”状表面缺陷,另外,对产生这些表面缺限原因初步分析,探讨后提出了改进措施,从而为现场提供判断依据。 相似文献
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带钢表面缺陷检测技术是高质量带钢产品生产的重要技术之一。针对以往带钢表面缺陷检测中存在漏检、定位不准、小尺度缺陷目标检测能力较差的问题,提出了一种改进YOLOv5的带钢表面缺陷检测算法(STCS-YOLO)。首先,在特征融合网络的输出部分采用Swin Transformer模块与原有C3模块相融合,增强对全局特征信息的交互与复用,显著提高了对小尺度缺陷目标的检测能力;其次,采用一种轻量级上采样算子CARAFE来替换传统上采样操作,以更好地恢复缺陷信息,提高对带钢表面缺陷的识别精度;最后,在特征提取网络中嵌入3-D权值注意力机制SimAM,以加强对前景特征信息的关注能力,提高对缺陷目标的强辨识能力。试验结果表明,所提算法在NEU-DET数据集上均值平均精度PmA达到了79.7%,比原网络提高了3.9个百分点,并且在模型权重与计算复杂度几乎不变的情况下,单帧检测时间达到了10.9 ms,基本能够满足带钢表面缺陷准确、快速的检测需求。本研究提出的带钢表面缺陷检测算法为生产整洁、无瑕的高质量带钢产品奠定了技术基础。 相似文献
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带钢是一种重要的钢铁材料,工业生产过程中带钢表面会产生各种不同的缺陷。带钢表面缺陷对产品有重要影响,其特征复杂、多样且不易获取,因此带钢表面缺陷检测一直是研究的重点内容。对带钢表面缺陷检测技术方法的研究进展进行了论述与分析。结合带钢表面缺陷种类,对传统的带钢表面检测方法如人工检测、红外检测、涡流检测和漏磁检测等优缺点进行比较分析,得出这些方法存在检测速度低、无法达到实时在线检测和需要人为干预等缺点。最后对机器视觉的检测方法开展了归纳总结,对基于深度学习的机器视觉识别表面缺陷的原理和方法进行了详述并对未来发展趋势进行了展望。 相似文献
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《钢铁冶炼》2013,40(1):12-16
AbstractVarious methods of detecting surface defects are being used in automated industrial manufacturing environments. This work presents the design and development of a laser charged couple device (CCD) displacement scanning system. The surface defect detection method using a laser CCD displacement sensor is derived from an idea in which surface defects such as cracks, inclusions and holes of three‐dimensional morphology characteristics are compared to normal surface especially in continuous casting slabs. Some novel research methods have been applied to develop the surface defect detection system used: first, getting a one‐dimensional distance matrix along transverse direction and a two‐dimensional matrix combining with a certain moving speed through the laser CCD displacement sensor; second, obtaining the slab surface profile and mapping to a greyscale image and finally, obtaining the surface defect regions by an image processing and searching algorithm and quantitatively detecting slab surface defect shape and depth. The research results in the lab trials have shown that the methodology proposed is effective to detect two‐dimensional defect size and reconstruct a three‐dimensional surface defect shape. At the same time, it is also able to accurately locate and identify surface defects and realise automatic surface defect non‐destructive detection online, and provides a theoretical base and technology idea for further studying surface defects online inspection for hot continuous casting slab. 相似文献
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The detection and classification of real-time surface defects play an important role in automotive sheet inspection and production. In this paper,an automatic surface inspection system( ASIS) based on signal processing in Baosteel NO. 4 cold-rolled plant is briefly presented. We demonstrate that the strip surface defect properties such as image,type,pitch,and position can be accurately calculated and classified by the automatic surface inspection system.In the manufacturing of the high-quality cold-rolled strips,it is necessary that the real-time surface defects can be detected and transferred by the automatic surface inspection system combined with annealing lines and recoiling lines. 相似文献
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针对铜管坯的孔洞、夹杂、裂纹、壁厚不均匀等常见缺陷难以在线检测的问题,引入超声波无损检测技术,设计开发了一套应用于熔铸现场的超声在线检测系统。结合铜管坯水平连铸工序对探伤的实际需求,设计多组体积缺陷、线缺陷、几何缺陷检测探头,实现对孔洞、裂纹、壁厚均匀性的在线检测。针对检测出来的铸坯缺陷数据和水平连铸实时工艺参数,开发了一套数据库管理系统,实现对水平连铸工序中多种数据的整合汇总和初步分析,为建立铸坯缺陷和工艺参数之间的关系,提供了一个信息化、智能化的数据库管理工具。 相似文献
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应用漏磁检测仪进行埋地油气管道腐蚀检测和识别,叙述了检测仪的硬件采集和信号处理过程.在直径273 mm的管道表面上加工人工缺陷,采集缺陷漏磁场信号,进行处理和转化为漏磁场云图,从信号和云图两者来分析漏磁场,提出了缺陷漏磁场的干扰消除方法、影响因素补偿技术和缺陷漏磁场图像的截取,并分别获得较好的效果,分析了缺陷定性和定量识别的方法,研究了缺陷外形参数量化的方法,得出了缺陷外形量化的数学模型,试验验证缺陷识别的效果,证明整个过程和方法有效可行,大大提高了管道缺陷检测和量化的精度. 相似文献
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Shape control by local heating is often used in processing of structural steels. Experience has proven that normalised steels are suitable for this operation if it is carried out properly. In the last years thermomechanically controlled rolled (TMCP) steels have been developed. For their application it was necessary to investigate the response of this steel type to flame straightening. Two essential processing conditions must be considered: heating limited to the surface and heating of the full material thickness. The temperatures were varied from 650 to 950°C by different heat inputs. Tensile and Charpy impact tests have proven that within this temperature range the investigated steels (S355ML -EN10113) were not affected. For conditions of wedge heating a drop in the mechanical properties was observed if the temperatures exceeded 650°C. Both limits, 950°C in line heating and 650°C in wedge heating allow an effective shaping of steel constructions. Experienced operators can easily respect these limitations. Hence the TMCP steels are suitable for flame straightening. 相似文献
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摘要:利用JmatPro软件模拟计算718类塑料模具钢(3Cr2MnNiMo)热物性参数。应用ABAQUS有限元模拟软件建立模具钢镦粗过程中孔洞模型,模拟不同压下率条件下孔洞的闭合规律。模拟结果表明:孔洞闭合分为开始闭合、闭合加速和闭合减速3个阶段;孔洞闭合的2个主要影响因素为孔洞表面等效应变εe、静水压力与等效应力之比σm/σe;随着孔洞所处位置不同,孔洞闭合度不同,根本原因为孔洞所处位置的等效应变不同。所得结果对于塑料模具钢实际锻造生产过程具有指导意义。 相似文献
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