共查询到18条相似文献,搜索用时 515 毫秒
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提出基于图像处理的焊缝像素位置自动提取方法,采用PYTHON软件和Open CV库进行焊缝像素位置自动提取。对工业相机采集到的焊缝图像利用中值滤波处理,得到去除噪音的焊缝图像;利用Otsu算法自适应阈值分割方法对滤波后的焊缝图像进行处理,得到二值化的焊缝图像;利用开操作对二值化处理后的焊缝图像进行形态学处理,去除图像中除目标像素外的小连通区域;通过骨架提取方法对形态学处理后的焊缝图像进行处理,获得单像素条纹;最终利用Hough变换进行直线检测,得到特征点位置。并借助pyqt5库开发出跨平台的应用程序,实现了焊缝位置坐标的自动提取,为实现焊缝的实时跟踪奠定基础。 相似文献
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欲使连续酸洗线在生产中实现连续运行,设计时对诸多影响因素的影响程度有一个正确的估计是很有必要的。 1.带钢长度 带钢长度,即冷轧原料卷每卷带钢的长度,它是影响酸洗程度最重要的因素。从下面的几个图中可看到这一点,但带钢长度是不能随意改变的,因为酸洗线之前的工序已经决定了带钢长度。 相似文献
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《金属材料与冶金工程》1997,(6)
含碳量为0.08%~0.17%的钢中,板坯纵向裂纹是影响热轧带钢表面质量的主要原因。由于纵向裂纹的存在,使板坯的修整费用大大增加。为解决这一问题,并建立板坯质量控制标准,台湾省高雄市的中华钢铁公司对此进行了研究.其研究结果为:板坯上纵向裂纹在热轧后.于热轧板上表现为一条被拉长的、较浅的裂纹,随压下量的增大,裂纹变浅但长度增大。若纵向裂纹能被磨削掉,则生产出的热轧带钢表面质量是合格的。因此,可以采用板坯铣面的方法,清除表面的纵向裂纹。铣削量愈大,热轧后带钢表面的裂纹愈浅。为了检查板坯横断面方向裂纹的变化… 相似文献
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304不锈钢2mm连铸薄带中的裂纹分布和形成分析 总被引:3,自引:0,他引:3
用扫描电镜(SEM)观察和分析了双辊连铸法生产的304不锈钢1 200 mm×2 mm铸带表面和内部裂纹的形貌和形成。由于采用导热性好的铜制结晶辊,薄带表面和内部产生了长140 mm、深0.33 mm的裂纹,薄带断面有分层现象。试验结果表明,铜制结晶辊使钢液的冷却速度达到(1~4)×103K/s,薄带接触辊面温度低,凝固区的温度梯度高达105K/m,温差产生的内应力和应力集中导致裂纹产生;MnS、MnO、Cr2O3等夹杂物是裂纹源。 相似文献
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Rachel Punch Martin Strangwood Claire Davis 《Metallurgical and Materials Transactions A》2012,43(12):4622-4632
A high-strength strip steel (yield strength of ~700?MPa) with a ductile-brittle transition over a wide temperature range shows splits (fissures) on the fracture surfaces in the upper transition region. The steel, hot rolled to strip thicknesses of approximately 10.0?mm and 16.8?mm, had a predominantly fine-grained ferrite microstructure with some coarse grain patches (area percent of 11?pct and 42?pct, respectively). Low-blow Charpy tests were carried out at room temperature, corresponding to the upper transition region for these strips. The low-blow tests resulted in the formation of splits without main crack propagation from the notch; therefore, the energies at which the splits initiated could be determined. Acoustic emission (AE) sensors were used during low-blow Charpy testing of the strip steels and mild steel (where no splits occur); it was found that AE was able to detect signals from the hammer impact, split formation, and ductile deformation. Optical microscopy, scanning electron microscopy (SEM), and X-ray tomography were carried out, which verified the presence of splits and showed that they propagated by transgranular cleavage, preferentially following coarse-grained regions. No significant difference in the number or length of splits between the 10- and 16.8-mm strip was observed, but the 10-mm strip did produce deeper splits during the low-blow Charpy testing. The deeper splits contribute to a lower impact transition temperature for the 10-mm strip material. 相似文献
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分析了珠钢EAF-CSP工艺生产的热轧带钢冷弯裂纹的形成原因。研究表明:碳、锰含量高的钢中容易形成带状组织,钢中较高的铜含量和带状组织是形成冷弯裂纹的重要原因;生产厚规格带钢时,薄板坯表面微裂纹在轧制过程中难以消除;通过对化学成分和生产工艺的合理控制可以显著提高带钢的冷弯合格率。 相似文献
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为了探究不同起爆位置下条形药包全场应变以及裂纹动态断裂特性,采用爆炸荷载动态焦散线实验系统和数字图像相关方法(DIC),开展了爆破模型实验研究。研究结果表明:条形药包一端起爆时,起爆点处翼裂纹扩展长度最小,随着炸药爆轰的传播,翼裂纹扩展长度增长;中心起爆时,中心位置翼裂纹扩展长度小于两端位置翼裂纹扩展长度,一端起爆时非起爆端翼裂纹扩展长度最长。无论中心起爆或一端起爆,条形药包中心区域翼裂纹扩展主要为Ⅰ型裂纹,并且中心翼裂纹起裂韧度最大,端部翼裂纹为以Ⅱ型为主的Ⅰ?Ⅱ型复合裂纹。一端起爆时,拉压应变作用范围沿炸药传爆方向传递,且非起爆端拉压应变作用区域大于起爆端,压应变最大值为距起爆点约0.67 ~ 0.83倍的装药长度。中心起爆时,拉压应变的作用过程沿起爆中心向两端呈对称形式传播,中心点位置应变最大。两种起爆方式下都出现端部压应力集中现象。 相似文献
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汽车用超高强度双相钢CR550/980DP冷轧边裂问题,严重影响热轧/冷轧工序界面生产顺行,易造成冷轧机架间及连退炉内断带事故,成为超高强度双相钢生产的难题。基于高温热塑性曲线和热轧动态CCT曲线,采用对显微组织、力学性能、裂纹扩展分析等手段明确冷轧边裂产生原因。试验结果分别指出,精轧阶段带钢横向温度分布不均匀、边部温降大,导致在第Ⅲ脆性区轧制;同时,受Nb作用再结晶温度提高,边部低温区为未再结晶区轧制;当应变量超过塑性极限、轧制力超过边部热强度时,形成热轧卷边裂。边部形成细小弥散的铁素体(F)和马氏体(M)两相组织,不协调应变将导致F/M相界面产生应力集中而形成裂纹;裂纹以微孔聚集方式进行扩展,形成热轧卷无边裂-冷轧边裂现象。通过投用边部加热器和优化初轧定宽量、精轧入口温度、精轧机架间冷却水、终轧温度、卷取温度等措施,实现热轧卷边部质量改善、解决边裂问题。 相似文献
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Numerical Simulation of Continuous Tension Leveling Process of Thin Strip Steel and Its Application 总被引:1,自引:0,他引:1
Cold rolled thin strip steel of high flatness quality undergoes multistage deformation during tension leveling. Thus, the parameters of set up and manipulating are more difficult. With the aid of FE code MSCMARC, the tension leveling process of thin strip steel was numerically simulated. Concentrating on the influence of the roll intermeshes in 2# anti cambering on the distribution and magnitude of residual stresses in leveled strip steel, several experiments were done with the tension leveler based on the results from the simulation. It was found from the simulation that the magnitude of longitudinal residual stresses in the cross section of the leveled strip steel regularly presents obvious interdependence with the roll intermeshes in 2# anti cambering. In addition, there is a steady zone as the longitudinal residual stresses of the surface layers in leveled strip steel vary with the roll intermeshes of 2# anti cambering, which is of importance in the manipulation of tension levelers. It was also found that the distribution of strains and stresses across the width of strip steel is uneven during leveling or after removing the tension loaded upon the strip, from which it was found that 3D simulation could not be replaced by 2D analysis because 2D analysis in this case cannot represent the physical behavior of strip steel deformation during tension leveling. 相似文献
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冷轧退火后的带钢,在平整过程中产生边部横纹,严重影响带钢的表面质量。通过现场研究分析,得出边部横纹产生的机理是由于带钢弯曲或者钢卷晃动等造成单边受力,发生屈服,产生滑移线所致。通过采取前道工序松边轧制、平整张力工艺调整、适当增加轧制力或延伸率、提高生产速度等措施可以有效预防和减轻横纹缺陷的产生。 相似文献