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The effect of slow shot speed and casting pressure on the 3d microstructure of high pressure die casting AE44 magnesium alloy

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Journal of Magnesium and Alloys 2023年第2期11卷 753-761页

作者： Chaosheng Ma Wenbo YU Tongtong Zhang Zihua Zhang Yihu Ma Shoumei Xiong Center of Materials Science and Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Research Center of Rail Vehicles Safety Monitoring and Health Management Beijing Jiaotong UniversityBeijing 100044China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

3d reconstruction.and 2d observation were conducted to characterize the microstructure of the castings produced through high pressure die casting with different *** results indicate that shrinkage pores generally co-existed with externally solidiﬁed crystals(ESCs).In specimen produced without fast slow shot speed,big net-shrinkage pores accompanied with ESCs were found in the center of the *** the casting pressurization was introduced,the shrinkage pores gathered to the specimen center and became much less due to the optimization of melt *** more porosity was found near the gate rather than in the middle of the rod bar,especially gas ***ﬁlling process simulation reveals that the middle position of the bars wasﬁrstlyﬁlled and followed by the near gate position accompanied with one intense turbulentﬂow.

关键词： HPdC parameters Externally solidiﬁed crystals(ESCs) Porosity 3d reconstruction.

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Improved shape from shading without initial information

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Frontiers of Computer Science 2017年第2期11卷 320-331页

作者： Lyes ABAdA Saliha AOUAT Laboratory of Research in Artificial Intelligence Department of Computer ScienceUniversity of Sciences and Technology Houari Boumediene (USTHB) Algiers 16111 Algeria

The number of constraints imposed on the sur- face, the light source, the camera model and in particular the initial information makes shape from shading （SFS） very dif- ficult for real applications. There are a considerable number of approaches which require an initial data about the 3d ob- ject such as boundary conditions （BC）. However, it is difficult to obtain these information for each point of the object Edge in the image, thus the application of these approaches is lim- ited. This paper shows an improvement of the Global View method proposed by Zhu and Shi [1]. The main improvement is that we make the resolution done automatically without any additional information on the 3d object. The method in- volves four steps. The first step is to determine the singular curves and the relationship between them. In the second step, we generate the global graph, determine the sub-graphs, and determine the partial and global configuration. The proposed method to determine the convexity and the concavity of the singular curves is applied in the third step. Finally, we apply the Fast-Marching method to reconstruct the 3d object. Our approach is successfully tested on some synthetic and real im- ages. Also, the obtained results are compared and discussed with some previous methods.

关键词： shape from shading SFS image formation equation level-set graphs theory 3d reconstruction.

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FEATURE RECOGNITION BASEd ON SERIES OF SLICING CONTOURS

FEATURE RECOGNITION BASED ON SERIES OF SLICING CONTOURS

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2006年中国机械工程学会年会暨中国工程院机械与运载工...

作者： LI Ming, LI Quanqing Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou(450015), China

The slicing contour is one of the most common used original information in reverse engineering. It is a dot matrix image of prototype’s cross section obtained from prototype being measured in certain

关键词： Feature reverse engineering solid modeling 3d reconstruction.

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Shape detection for Impeller Blades by Non-contact Coordinate Measuring Machine

Shape Detection for Impeller Blades by Non-contact Coordinat...

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Computer and Computing Technologies in Agriculture IV——4th IFIP TC 12 Conference(CCTA2010) Part IV

作者： Shimin Luo School of Railway Tracks and Transportation East China Jiaotong University

The impeller blades are very important and precise parts in turbine,but they can be worn and deformed *** this paper,we present a novel approach to detect the shape of the impeller *** proposed approach is to compare the designed 3d model of the impeller blades with the virtual 3d model of the tested part which is reconstructed by non-contact coordinate measuring *** non-contact coordinate measuring machine measures an object with optical triangulation,and then we can reconstruct a virtual 3d model for the *** contrast to previous approaches which detect the parts with complex surface,the proposed shape detection approach is scatheless and *** results also show that our approach gets the shape of the tested part precisely and describes the deformed condition clearly.

关键词： Impeller blade Non-contact coordinate measuring machine Shape detection Optical triangulation Complex surface 3d reconstruction.

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