共查询到18条相似文献,搜索用时 134 毫秒
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精确测量空间自由曲面的传统方法是采用三坐标测量机的接触测量或简单的非接触测量,这些测量方法存在工作效率低,自动化程度低等缺点。在深入研究上述方法的基础上,提出了一种自由曲面的非接触自动测量方法,介绍了测量系统的构成,曲面边缘的提取,自动扫描方式的规划以及测头跟踪方式等设计要点。 相似文献
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提出了一种坡口及焊缝表面三维轮廓激光视觉测量方法. 投射在坡口及焊缝轮廓表面的激光条纹,其视觉图像可作为表征轮廓特征的信息源,系统采集连续扫描的激光条纹视觉图像,得到条纹上各离散点的三维坐标. 同时采用一种搜索拟合插值算法,获取条纹间各离散点的三维坐标,在系统的三维坐标系中,采用离散点直连成网格的曲面重构方法,实现了一段坡口及焊缝表面三维轮廓的实时测量. 结果表明,在重构的三维表面轮廓任意截面上,获取的坡口宽度和深度值与游标卡尺实际测量值吻合度可达97.85%以上,这种激光视觉测量方法是可行的. 相似文献
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三维扫描及逆向设计技术具有技术先进、精度和效率高等特点,近年来在工业制造领域得到越来越广泛的应用.因此,将三维扫描及逆向设计技术应用于叶轮的设计制造及加工质量检验成为了当前的研究热点.论文通过应用新型Win3D-M扫描系统三维扫描仪及相关设计软件,进行叶轮的逆向设计、曲面重构、及改进等工作,拓宽三维扫描及逆向设计技术的... 相似文献
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三维扫描及逆向设计技术具有技术先进、精度和效率高等特点,近年来在工业制造领域得到越来越广泛的应用.因此,将三维扫描及逆向设计技术应用于飞机叶轮的设计制造及加工质量检验成为了当前的研究热点.论文通过应用新型Win3D-M扫描系统三维扫描仪及相关设计软件,进行飞机叶轮的逆向设计、曲面重构、及改进等工作,拓宽三维扫描及逆向设... 相似文献
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三坐标测量机是一种高精度的自动化测量设备,检测范围广泛。不仅适用于常规产品的尺寸公差、形位公差检验,而且也适用于复杂工件以及复杂尺寸的测量,同时也可应用于产品的逆向开发,为我们在日常的产品设计和制造过程中提供了重要的技术资料。我们通过列举在实际工作中的几个测量事例,说明三坐标测量机在超硬材料行业中已经发挥着重要作用,为我们的科研生产和产品开发提供技术支持。 相似文献
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为了提高通用航空飞机产品的加工质量,数字化定义模型和光学测量定位技术在产品质量检测体系中得到逐步应用。利用激光跟踪仪及其配套测量软件Polyworks对通飞曲面产品的测量过程进行工艺规划和测量路径可视化过程仿真,为曲面类产品的现场测量提供理论及工艺指导。为了提高测量拟合精度提出自由度定位基准点坐标对齐与最近点迭代算法对齐点数据相结合的方法,将产品测量坐标映射到设计坐标系下,完成数字化测量坐标系的统一,并实例验证。利用CATIA的开发接口采用CAA C++技术作为二次开发手段完成信息获取,并在计算机三维软件中与激光跟踪仪测量软件Polyworks完成测量点通信,利用宏脚本编辑语(MSCL)编辑程序将坐标转换之后的测量点进行路径仿真从而生成可视化的数字化测量工艺规划过程。 相似文献
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Seokbae Son Hyunpung Park Kwan H. Lee 《International Journal of Machine Tools and Manufacture》2002,42(8)
Recently, laser scanners have been used more often for inspection and reverse engineering in industry, such as for motors, electronic products, dies and molds. However, due to the lack of efficient scanning software, laser scanners are usually manually operated. Therefore, the tasks that involve inspection and reverse engineering processes are very expensive. In this research, we propose an automated measuring system for parts having a freeform surface. In order to automate a measuring process, appropriate hardware system as well as software modules are required. The hardware system consists of a laser scanning device and setup fixtures that can provide proper location and orientation for the part to be measured. The software modules generate optimal scan plans so that the scanning operation can be performed accordingly. In the scan planning step, various scanning parameters are considered in the generation of optimal scan paths, such as the view angle, depth of field, the length of the stripe, and occlusion. In the scanning step, the generated scan plans are downloaded to the industrial laser scanner and the point data are captured automatically. The measured point data sets are registered automatically and the quality of point data is evaluated by checking the difference between the CAD model and the measured data. To demonstrate an automated measuring system, a motorized rotary table with two degrees of freedom and a CNC-type laser scanner with four degrees of freedom are used. 相似文献
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This paper presents a system and methodology for on-line free form surface measurement via a scanning contact probe installed on a CNC (computer numerical control) machine. The scanning probe provides more sampling points than any traditional touch trigger type of probes used on CNC machines, and better measuring accuracy than laser displacement sensing or structured lighting. The presented measuring system's main advantage is that the number of measured points can vary with the change of surface curvature. To improve the measuring stability and continuity, fuzzy logic control, in lieu of traditional PID control, is employed. As a result, the system is capable of continuously detecting the boundaries of a measured object and measuring a relatively large complex surface. Based on the experimental results, the measuring accuracy is estimated between 20 and 30 μm (micrometers). In addition to surface measurement, the reconstructed surface data can be fed to a CAD/CAM system for component making or reproduction, which makes the reverse engineering of models comprised of free form surfaces readily accessible. 相似文献
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逆向设计中根据原型对象结构特征,选择合理的数据采集方式至关重要.本文以汽车排气歧管为研究对象,将非接触式光学扫描与接触式三坐标测量进行有机结合,准确实现了实物表面数字化,并给出了具体的实现方式. 相似文献
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研发了一套基于二维激光扫描测试装置的复合材料层合板热振试验装置。利用PLC控制器、触摸屏、滑台型导轨、步进电机、激振器、功率放大器、激光测振仪、加热及温控装置、振动控制仪及数据采集分析装置等,建立了满足层合板高温测振需求的硬件系统。基于PLC梯形图语言编写了二维激光扫描测试装置的控制软件,并详细介绍了手动、自动控制模块对应的操作界面与测控优势。以HF10碳纤维/树脂基层合板试件为例,对该装置进行了研究。结果表明:该装置可显著提高热环境下层合板结构模态振型的测试效率,且有利于研究不同温度对结构振动特性的影响。研究发现热环境对层合板固有频率和阻尼性能有着复杂影响,且随着温度的不断升高,模态阻尼比呈现减速增大的趋势。 相似文献