共查询到19条相似文献,搜索用时 437 毫秒
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应用定性化数据测量系统分析方法,发现了检验人员对钢材表面质量缺陷判定不一致性的问题,提出了"定位、定量、定度"检验表面质量缺陷的方法;有效解决了检验人员对质量缺陷判定不一致的问题,向用户提供了满意的产品。 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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为改善数据库冷备份的缺陷,针对武汉钢铁股份有限公司热轧二分厂过程控制系统数据库特性,利用一台配备双网卡的工作站和Oracle逻辑备份与恢复工具,通过网段切换与数据存储,实现数据库的实时备份与快速恢复,提高了数据安全性,简化了数据恢复过程,为安全生产创造了有利条件。 相似文献
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《冶金自动化》2015,(3)
<正>北京科技大学高效轧制国家工程研究中心自主研究开发的表面缺陷在线检测HXSI系统,又新添一处业绩——四川广汉天成不锈钢制品有限公司不锈冷轧表面缺陷在线检测系统于2015年3月底上线并完成热负荷试车,目前系统已交付甲方使用。HXSI系统是高效轧制国家工程研究中心2008年自主研发的钢铁领域全流程表面缺陷在线检测系统,检测范围包括从连铸坯到热连轧、中厚板、冷轧的各流程。HXSI系统能实现高温、高速和复杂背景下的金属表面缺陷在线检测,系统最小检测精度能达到0.12 mm/pixel,系统最大检测速度26 m/s。HXSI系统在表面缺陷检测与识别算法、数据实时处理、图像采集与传送、照明技术等方面具有特色和突出的优势。HXSI系统曾获省部级一等奖2项、二等 相似文献
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Tests data of bending strengths of a large number of timber beams of different spans obtained at the Swedish Institute for Wood Technology Research reveal a statistical structure that can be represented in a simple probabilistic model of series system type. A particular feature of the data from one of the large test series is that unintentionally the data became randomly censored upwards. This censoring of the data rules out both the moment estimation method and the maximum likelihood method. Instead valid parameter estimates can be obtained by maximizing the posterior density defined as the likelihood function multiplied by a suitably chosen noninformative prior density (MP method). Subsequently using bias factors assessed by simulation ensures that the corrected MP estimates are unbiased. A closed form analytical expression for the distribution function of the bending strength of a beam with any given number of defect clusters follows from the obtained distribution model for the bending strength of the random single defect cluster. The empirical distribution function of bending test results for a sample of beams with two defect clusters is well predicted, and for long beams with several defect clusters the same is the case in the lower tail up to at least about the 50% probability level. 相似文献
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目前实际工业生产中的钢带缺陷检测任务存在数据难以收集、缺陷识别效果较差等问题,为此提出一种基于Faster-RCNN的钢带缺陷检测模型FRDNet。通过k-means聚类获得锚框参数,使生成框更符合目标缺陷类别比例,提高缺陷检测精度;同时利用模型迁移的方式微调网络结构,使钢带缺陷检测模型更快地适应目标缺陷任务。该方法有效解决了目标钢带表面缺陷数据较少的问题,增强了模型的泛化性。试验结果表明,该方法在GC10-DET钢带缺陷数据集上平均精确率均值mAP达67.6%,相较于原始模型提升了4.9%,检测速度为27.2FPS,满足检测任务的要求。 相似文献
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Fatigue properties of cast aluminum components are controlled by maximum defect size in the material. The larger the maximum
defect size, the lower the fatigue strength and life. In the presence of casting defects, crack initiation can be ignored
and fatigue life is mainly spent in crack propagation. Therefore, fatigue life of aluminum castings can be predicted by long
or short crack growth models. The main problem is defining a starting defect size from readily available data, such as twodimensional
(2-D) pore size measurements on metallographic sections. In this article, an extremevalue statistics (EVS) method was used
to estimate the maximum defect size in 319 castings from conventional metallographic data. The maximum defect size predicted
by EVS agrees quite well with the initiation defect sizes measured from fracture surfaces, and the predicted fatigue life
is in reasonable agreement with the experimental data. 相似文献
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文中主要针对一种压入型缺陷造成的制罐针孔缺陷进行分析,确定了缺陷产生的原因与冷轧过滤介质洁净度的相关性,根据全流程排除法确定产生问题的根本原因为轧机过滤系统缺陷,提出相应解决措施。 相似文献