共查询到18条相似文献,搜索用时 62 毫秒
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锡膏印刷机并联平台定位算法的研究 总被引:5,自引:1,他引:4
锡膏印刷作为表面贴装技术(Surface Mount Technology,SMT)工艺流程的第一道工序,也是SMT质量的基础.针对平台纠偏定位精度不高而导致印刷后PCB锡膏偏移的问题,从全自动锡膏印刷机并联平台的结构分析出发,根据其运动特性,建立平台的运动分析模型,结合最小二乘法原理,给出了一种定位速度快、精度高的定位算法.实验与应用中,通过机器视觉系统获取PCB与钢网上Mark坐标差值,经该算法定位后结合误差理论分析定位误差.结果表明,该算法可一次性完成纠偏·不仅节:节省了平台机械定位时间,而且有效避免了并联平台分步运动时的耦合误差,平台重复定位精度稳定在±10μm、±0.005°以内. 相似文献
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根据锡膏搅拌机的功能要求,分析了3种机械传动方案,比较后确定了结构相对简单的传统方案,并给出了基于MCS-51单片机的控制系统电路原理图. 相似文献
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焊膏印刷机控制系统的稳定性以及系统控制精度直接影响表面贴装印刷电路板(PCB)的质量。开发了基于总线结构的全自动视觉焊膏印刷机控制系统,系统的人机交互、PCB板自动传输、视觉定位、上网板纠偏以及刮刀控制等功能分离,分别由上、下位控制机完成,保证了控制系统的稳定性以及响应速度。控制系统中,上网板纠偏控制采用了伺服系统,视觉相机的定位是通过PLC的高速口对光栅尺计数,保证了系统的定位精度。实验结果表明,控制系统上网板找正定位精度达到了10μm,印刷节拍时间为15 s。 相似文献
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A location system is very important for solder paste printing in the process of surface mount technology (SMT). Using machine
vision technology to complete the location mission is new and very efficient. This paper presents an integrated visual location
system for solder paste printing based on machine vision. The working principle of solder paste printing is introduced and
then the design and implementation of the visual location system are described. In the system, two key techniques are completed
by secondary development based on VisionPro. One is accurate image location solved by the pattern-based location algorithms
of PatMax. The other one is camera calibration that is achieved by image warping technology through the checkerboard plate.
Moreover, the system can provide good performances such as high image locating accuracy with 1/40 sub-pixels, high anti-jamming,
and high-speed location of objects whose appearance is rotated, scaled, and/or stretched. 相似文献
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为了实现高速高精度定位,在RBF神经网络单步预测模型的基础上,建立多步预测控制系统,为当前高速定位控制提供操作指导。在定位过程中通过预测位置与实际位置比较,灵活调整定位速度。实验表明神经网络预测控制是实现高速高精度定位的有效手段。 相似文献
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基于Matlab的划片机自动对准系统的研究 总被引:1,自引:0,他引:1
分析了划片机自动对准系统的构成和工作原理,提出模板匹配的简化算法,从边缘检测处理后的图像中提取晶圆切道,通过直线拟合得到晶圆切道中心线,完成晶圆的定位。Matlab的仿真与实验结果表明,该自动对准方案能有效地识别晶圆中的切道,确定切道的位置偏差,满足晶圆自动对准的技术要求。 相似文献
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M. R. Driels C. C. Lee 《The International Journal of Advanced Manufacturing Technology》1988,3(4):3-32
In this paper, three successive feature reduction methods are employed to select good features for the automatic visual inspection
of solder joints. This reduction strategy includes (1) a stability test to remove the features with unstable performance,
(2) a separability examination to select the features with good classification capabilities, (3) a correlation analysis to
delete the redundant features. Three sets of features are implemented in this feature reduction work: (1) a circular sub-area
feature set is related to the intensity conditions within distinct areas in the joint image, (2) a moment of inertia feature
set is based upon the intensity of pixels and their relative position in the image plane, (3) a surface curvature feature
set analyses the three-dimensional joint topology. Initially 50 features are formulated based on the above strategy. The reduction
technique deletes 39 features from this set because of instability, poor performance, and high correlation with other features.
Finally, the remaining 11 feature are tested and shown to be superior to state-of-the-art identification methods. 相似文献
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S. Q. Xie K. C. Aw B. Roylance D. Jayasinghe 《The International Journal of Advanced Manufacturing Technology》2007,32(5-6):578-590
Crystal oscillator products are widely used in a wide range of industry applications, such as global positioning satellites,
wireless applications and cellular networks technologies. The quality of crystal oscillators normally depends on how they
are cut from crystal bars. However, the current manual crystal bar alignment procedure is very much dependant on operator
skill, and is not repeatable, leading to variations of the oscillators’ quality. The research is to develop an automated alignment
system for aligning quartz crystal bars prior to being cut. The paper investigates the magnitude of the effects of rotational
misalignments in the y-axis. Axis errors in the y-axis are found to create x-axis misalignments of up to thirty percent of the y-axis error. The feasibility of such a system is also analysed in terms of the required mechanical and electrical requirements,
and a test-bed is built to carry out future experiments and automate the alignment process. 相似文献
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论文研究了热转印标签打印机工作原理,提出了以M30802为核心的热转印标签打印机控制电路结构,重点研究了热转印标签打印机的外部接口通信电路、步进电机驱动电路、检测电路的结构和功能。该控制电路具有构成简单、成本低、通信可靠等优点。 相似文献