Liyun Zhuo
ABSTRACT
The current spatial shapes, such as components, mechanical assembly units, and final assembly, are mainly designed and studied by means of three-dimensional software, through which these shapes are finally represented by two-dimensional mechanical engineering drawings in terms of five expression methods, namely, view, section view, cross-section view, drawing of partial enlargement and simplified schematic diagram. The foregoing situation not only leads to the lack of intuition and realism of engineering drawings but also requires the related engineer to have high ability regarding spatial imagination and to have professional knowledge in the procedure of drafting and recognizing drawings, particularly, the engineering drawings that lack manufacturing and management information cannot meet the requirements of informationized management of production process and high-level informatization in the future for the current enterprise. In order to restore the original appearance of the spatial shape and realize the connection of the informationized design, manufacturing, and management of mechanical components and systems in the whole process, a new holographic digital 3D system of engineering drawings is proposed and constructed in this work. This system is oriented to the digitization of the management of the whole life cycle of mechanical products (including production requirement, design, manufacturing, assembly, detection, maintenance, management, and service, etc.), which defines all information systematically, such as geometric features, topological features, process features and production management features required by components, assembly units and final assemblies. The engineering drawings are represented by integrating 3D drawing, annotation, and index, in an intuitive manner, which is ready to be understood and used, meeting the requirements of informatization. This system adopts the number set (i.e., vector), matrix, and Boolean operation to express all the information of the previously mentioned components, and it is illustrated with a mechanical component of the valve stem for verification. The results show that the proposed method of the 3D new system to represent the engineering drawings of mechanical components is applicable and practical to industrial engineering.
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