Papers by Keyword: Computer Aided Design (CAD)

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Authors: Jian Ping Liu, Bang Yan Ye, Jian Xi Peng
Abstract: For inverse constructing object from its orthographic image, a new method of 3D reconstruction based on image vectorization and bi-arc approximation of cubic B-spline is investigated. A 3D CAD model is automatically acquired from 2D views by means of 2D primitive recognition, 3D reconstruction of primitive and combination of 3D primitive bodies. With the help of CimatronE8.0 software, reasonable procedure design and optimization toolpath planning are applied to increase machining accuracy and productivity during automatic programming for reconstructed 3D solid. Reconstructed parts are machined on the VMC-600 type machine center with FANUC system. The results of application indicate that this method has many advantages, such as quickly obtaining the CAD model of part, getting smooth machined surface, efficient machining without invalid or reduplicate feed and so on. As a result, it can be applied widely in NC machining field.
Authors: Zong Xia Jiao, Xiao Dong Wang, Guo Ping Huang
Abstract: A CAD/CAM idea with its relation model including the analyses of braid process, yarns internal geometry and mechanical properties is proposed. An infrastructure of CAD/CAM system with platform and criterions which endure expandability is introduced. Based on the platform, some subsystems are built to accomplish various tasks such as 3D modeling, finite element analysis and braided process simulation. In order to implement the platform, parameter transferring is analyzed and an example is given. Based on the braiding process of composite, the axis direction stiffness/flexibility matrix, cell stiffness and engineering constants is acquired by the analysis of yarns and cell. At last, a proper and feasible collaborative environment and the tasks assignment is proposed. Based on the platform, an analysis instance is finished and the results are exhibited.
Authors: Hong Xing Liu, Qun Ying Fu, Zhi Qiang Meng
Abstract: Charge weight is an important consideration when calculating for the blasting crater. The main parameters affecting the blasting crater are the rock type, minimum amount of chemicals consumed, and resistance lines. Although only a few parameters influence the blasting crater, calculating and speadsheeting require a large amount of work and furnish results that are not intuitive. Moreover, the calculation of blasting crater parameters takes time. The current study calculated the parameters using Visual Basic to illustrate a fast spreadsheeting and mapping method using Computer-Aided Design, the design for the charge until the supporting role.
Authors: Hai Yan Yu, Yong Xing Wang, Sheng Ze Wang, Zhao Feng Geng
Abstract: In some textile machines, fabric is an inseparable element for motion and force transmitting. But the existing mechanical simulation software cannot model the fabric. This paper proposes a new cloth simulation method by blurring machinery (rigid) and cloth (soft) boundaries. This approach simulates the soft with tiny rigid bodies, large deformation with small ones. It aims to integrate the cloth modeling to the mechanical simulation system. Finally, we establish a cloth simulation model on the mechanical modeling and simulation platform, which is an embodiment of our integrated concept.
Authors: Qi Wang, Jian Ming Wang
Abstract: To estimate the precise mechanical properties of the three-dimensional (3D) braided composite, a geometric study is needed. Owing to the complexity of the yarn paths inside the preform, the geometric modeling for 3D braided composite is always time consuming. In this paper, an efficient method, namely preform boundary reflection (PBR) method, is proposed for motion model construction in geometric study. Furthermore, the CAD simulation system was developed for integral geometric descriptions of 3D braided preform with different parameters. Compared with the traditional method, the novel method significantly simplifies the simulation process without affecting the precision of geometric structure. As a result, the structure design for composite preform is effectively accelerated. The new method establishes the foundation of microstructure and mechanical properties analysis for the preforms with complex geometric structures.
Authors: Jing Chen Xie
Abstract: This study explores the computer-aided design with 3ds Max by the students from the Department of Commercial Design of a Technology University in Central Taiwan based on the concept of social service network, to save time and cost of mold development, so that plastic factories can transform from OEMs to developers. This way, small and middle-sized enterprises in Taiwan will have better competitiveness in the market.
Authors: Yong Jian Zhu, Shao Hui Yin, Wei Qing Pan, Yu Feng Fan, Kun Tang
Abstract: The lens molding technology has become a promising fabrication method for glass lens, especially for aspheric glass lens in batch. Because during the real compression molding, the error compensation for mold shape turns very difficult, the mold needs to be repaired repeatedly to meet the requirements of lens molding. To solve this problem, a cooperative design scheme is proposed. However, the scheme is not limited to solving the mold repairing; it also aims to providing the integrated and optimal design for aspheric glass-lens mold. In fact, the cooperative scheme is a collaborative software platform, which integrates with data processing, optical design, finite element analysis, error compensation and mechanical design for lens molding. On this platform, users only need to submit the (camera) lens parameters or measured data of aspheric lens, and then the platform can provide the final mold drawings, which will be input in the CNC software of ultra-precision machine and guide the mold fabrication. Meanwhile, the cooperative platform is Network-based PDM system, so designers could remotely communicate with it and help to finish the mold design jointly. In this case, the cooperative design could tremendously improve the efficiency and accuracy of lens molding.
Authors: Xiao Lin Lu
Abstract: In surface modeling, it is important to reconstruct the smooth connecting surface for the polyhedron vertex and edge rendering. The general method by using the spherical and cylindrical surfaces do not possess the geometric continuity. This paper proposed a geometric modeling method of reconstruction vertices and edges with smooth surface for the polyhedron corner rendering with high order geometric continuity. The proposed method is based on the principle of the theory of geometry continuity through a geometry drawing algorithm. The reconstructed surface can be connected neighboring surfaces with G1 geometry continuity. The results show that the reconstructed surfaces can polish and render the polyhedron corner with good geometry continuity property.
Authors: Yung Yuan Hsu
Abstract: The purpose of this study was to construct a knowledge-based CAD/KBE system for the optimal design of golf heads. The inability of conventional CAD systems to identify existing knowledge during design and manufacturing processes is a current development bottleneck. Therefore, this study attempted to effectively introduce and integrate KBE technology into a CAD system, so as to achieve the objective of knowledge driven automation (KDA). This study selected golf iron heads with a complex-design surface as the research subject, adopted commercial CAD software (UG/NX) and its secondary development environment as a platform and applied perturbation vectors in the control of NURBS free-form surfaces. We changed the CAD’s entity shapes and physical properties, integrated the optimal principle of design with a CAD solid model, to automatically drive the CAD solid model of golf iron heads according to the design objectives, and constructed a knowledge-based optimal CAD design technology.
Authors: Woldemichael Dereje Engida, Fakhruldin Mohd Hashim, Sujan Debnath
Abstract: Conceptual design process is considered as the most critical and important phase of product design process. It is the stage where product’s fundamental features are determined, large proportion of the lifecycle cost of the product is committed, and other major decisions are made, which have significant impact on the downstream design and related manufacturing processes. It is also a knowledge intensive process where diverse knowledge and several years of experience are put together to design quality and cost effective products. Unfortunately, computer support systems for this phase are lagging behind compared to the currently available commercial computer aided design (CAD) tools for the later stage of design. This paper proposes a knowledge-based conceptual design support system in which design concepts from existing products and previous experiences are captured and used to design future products. The conceptual design support system will assist designers during the conceptual design process by generating concepts on a morphology chart and handling some of the repetitive tasks. In addition, the generated concepts may inspire designers to generate new concepts. The design support system addresses the key features of conceptual design process such as functional analysis, concept generation and concept evaluation with aid of the production rules within the knowledge-based system.
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