共查询到18条相似文献,搜索用时 99 毫秒
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为降低长焊缝激光拼焊对板材边缘直线度的要求,提出了焊缝碾压预成形技术,其通过利用碾压轮碾压板材边缘使其发生属性变形来消除焊缝间隙,并且能够实现碾压量随间隙量大小而实时调整以保证板材碾压变形后的延展量正好填补两板间的间隙量.介绍了其机构原理及控制原理:通过实验测量与数学拟合的方法建立了碾压过程的数学模型.碾压和焊接实验表明长焊缝激光拼焊焊缝碾压预成形技术能方便消除焊前两板间间隙,大大降低激光焊接对板材边缘直线度的要求,保证焊接质量和提高焊接速度. 相似文献
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拼焊板是将几块不同材质、不同厚度、不同涂层的钢材焊接成一块整体板,以满足零部件不同部位对材料不同性能的要求。以纵梁为例:为了保证功能的需要,前纵梁的主体必须有一定的柔性,而门板的前、后部需要有一定的强度。如果采用传统的冲压成形方法就需要另外设计加强 相似文献
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在基于结构光视觉的激光拼焊焊缝表面质量检测系统中,需要准确获得焊缝结构光条纹中心线和特征点的位置.由于焊接过程中的各种噪声干扰,使得焊缝图像复杂多变,因此选择合理高效的图像处理算法是非常重要的.针对这一问题,对结构光视觉焊缝质量检测系统图像处理方法进行了深入研究.在图像预处理中,首先通过开窗处理来获得兴趣区域,采用中值滤波去除图像噪声.在结构光条纹中心线提取过程中,提出了一种新的模板法获得了条纹的边界并用几何中心法提取了条纹中心线;最后,使用斜率分析法提取了特征点.试验表明,该方法具有较高的特征点检测可靠性,并且运算速度快、抗干扰能力强,具有较高实用价值. 相似文献
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Yan Luo Xinhua Tang Fenggui Lu 《The International Journal of Advanced Manufacturing Technology》2014,73(5-8):699-706
Unlike the normal vacuum chamber that a workpiece is put inside, a new vacuum chamber was designed to put on the welding zone of a workpiece, which has no size limit with this chamber, so that a large and thick plate could be welded with laser under low pressure. In this new vacuum chamber, a local subatmospheric pressure on the welding zone was achieved with side draught by a vacuum pump. A series of spot welding experiments were performed with fiber laser under subatmospheric pressure, normal atmospheric pressure with and without shielding gas side-blowing, respectively. The feature of weld surfaces and cross-section profiles for above different conditions were compared. A high-speed camera was applied to observe the behavior of plasma plume. The results indicated that the deeper welding penetration and narrower weld bead width could be obtained under subatmospheric pressure. The characteristics of spot weld bead under local subatmospheric pressure were quite different from the one under normal atmospheric pressure with shielding gas side-blowing method. The plasma plume was suppressed more effectively by local subatmospheric pressure than that by shielding gas side-blowing. Additional experiments of continuous laser welding under local subatmospheric pressure were tried and sound welds could be obtained. 相似文献
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Sang Wook Han Tae Woo Hwang Il Yeong Oh Young Hoon Moon 《Journal of Mechanical Science and Technology》2018,32(4):1575-1584
Tailored blanks with different blank thicknesses are semi-finished parts that can be used to produce lightweight vehicle parts. This study investigates a manufacturing process that can produce tailored blanks by rolling partially stacked blanks. The process was experimentally and numerically investigated using various processing conditions. To characterize the process, the deformation behaviors of upper and lower blanks were analyzed and quantified. The dimensional variations at the top end and the transition zones were analyzed based on the cross-sectional thickness profiles of formed blanks. The results show that the proposed process is feasible for the production of tailored rolled blanks that have both straight edges with a concave transition zone and convex edges with a straight transition zone. 相似文献
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