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实现逆向工程的关键在于对曲面部件建立点云数据并进行适当的数据处理,使曲面模型满足加工制造要求。采用三维扫描仪完成曲面零件的扫描工作得到呈高度密集的点云数据,在Geomagic Studio环境下对密集点云进行数据处理,输出封装文件,并在Geomagic Design X中实现封装文件的建模,导入Geomagic Qualify进行误差检测同时生成分析报告。进入SIEMENS NX加工模块实现逆向模型的工艺编程,后处理操作输出数控加工程序。在SIEMENS NX和CIMCO Edit环境下模拟数控加工过程,验证数控程序的工艺可靠性。实验证实,将Geomagic、SIEMENS NX和CIMCO Edit结合起来的方法可以实现复杂曲面零件的逆向制造,提高逆向加工工艺的可靠性。 相似文献
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Modal analysis and seismic response analysis were carried out for the equatorial diagnostic port plug of international thermonuclear
experimental reactor (ITER). The aim of the theoretical analysis is to verify structural strength and reliability of the device.
The working condition includes one-dimensional seismic wave and two-dimensional seismic wave. Modal analysis of the device
shows that primary vibration is inclined to occur in low-order modes. The horizontal (X-direction, Y-direction) maximum vibration appears at the first and the fourth eigen modes, with the natural frequency of 70.59 and 215.88
Hz respectively, and the vertical (Z-direction) primary vibration appears at the second eigen mode with the natural frequency of 82.85 Hz. According to the results
of the finite element analysis (FEA) program, the weak portions of the device are distributed in the joint of port body with
blanket shielding module (BSM) and inner side wall of ribbed plate for lifting flange, the maximum von Mises stress is 14.8
MPa with the Y-direction seismic wave. In accordance with the design criteria, the destructive effect is far below the failure boundary,
and the structural reliability of the equatorial diagnostic port plug can meet the requirements of the design specifications.
Foundation item: Project(10405024) supported by the National Natural Science Foundation of China; Project supported by International Thermonuclear
Experimental Reactor Organization in France 相似文献
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采用差式扫描量热方法进行热分析实验,研究不同加热速率下非晶合金条带Fe73.5Cu1Nb3Si13.5B9的晶化动力学特性.DSC曲线的晶化温度和晶化峰值温度随着加热速率的增高而向高温方向迁移,说明合金的晶化过程表现出明显的动力学特性.建立基辛格模型,拟合动力学模型函数对结晶率的实验曲线,可以获得动力学参数值,得出晶化激活能的数值为2.89 eV.研究表明:对于Fe73.5 Cu1Nb3Si13.5B9合金,采用经验的双参数Sestak-Berggre模型能更加定量描述其晶化过程,而Johnson-Mehl-Avrami模型适宜在较低加热速率下描述. 相似文献
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对于一个企业来说,降低成本和缩短周期是新产品在设计与制造时的一个主要任务,而逆向工程(RE)在加速产品的研发和从其他产品借鉴设计思路中发挥着重要的作用。在传统的测绘模式下,由于产品模型特殊的结构和复杂的拓扑关系,要想获得模型的全部表面数据信息并不是一件容易的事情,而要获得表面点云数据更是困难。因此本文考虑采用先进的逆向工程技术,依靠原始点云的采集方法和数据优化的处理步骤,通过对模型进行逆向工程而反求原型表面,其中包括消除噪声、数据插值、数据平滑、数据过滤、数据拼接、曲面重构等步骤,得到了精细的表面重构模型,成功地构建了CAD模型并获得了良好的原型表面。 相似文献