Digital Design and Manufacturing Technology

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Authors: Jun Han, Fa Zhong Shi, Li Kang Shao
Abstract: Springback is an inevitable process of sheet metal forming phenomenon. Numerical simulation is an effective way to solve the springback problem, and more and more attention to industry and academia. This paper describes the implicit springback analysis of the BFGS equilibrium iteration method, and proposes a strategy for optimizing the calculation, reducing the computation and avoiding the potential problem of instability in the calculation. At last, the use of self-developed software gives numerical examples.
Authors: Cong Da Lu, Yi Lian Zhang, Shao Fei Jiang, Guo Zhong Chai
Abstract: In this paper, the main molding process parameters which are relevant to warpage were optimized by orthogonal experiment and finite element software MPI. The result shows that we can get a series of optimized parameters and know how much each process parameter influences the warpage by combining orthogonal experiments with simulation experiments using MPI, while fewer experiments are needed. Verified by MPI, such series of optimized parameters can keep the warpage in a low level and completely meet the standard of the product.
Authors: Zhao Liang Jiang, Xiang Xu Meng
Abstract: The work-piece holding in the fixture will have elastic deformation under the effect of clamping force and the positioning of locators which will lead to poor quality. In this paper, after comparing the advantage of High Definition Metrology (HDM) with the traditional contact measurement metrology, the surface flatness measurement experiment scheme was designed based on HDM. Then, it was optimized with Design of Experiment (DOE). Finally, the work-piece elastic deformation caused by clamping force, its location and support location were analyzed using the case of Aluminum alloy 6061 part.
Authors: Bin Zhao
Abstract: In order to study the static and dynamical characteristics of the crankshaft, ANSYS software was used to carry out the corresponding calculations. The entity model of the crankshaft was established by UG software firstly, and then was imported into ANSYS software for meshing, and then the finite element model of the crankshaft was constructed. The crankshaft satisfied the requirement of stiffness and strength through static analysis. The top six natural frequencies and corresponding shapes were acquired through modal analysis, and the every order critical rotating speed of the crankshaft was calculated. The fatigue life of the crank was calculated by fatigue module of ANSYS software finally. These results offered the theoretical guidance for designing, manufacturing and repairing the crankshaft.
Authors: Zong Yan Wang, Shu Fang Wu, Long Liang Pang
Abstract: To solve the problem such as large amounts of repeated designs and long design cycle in the traditional design process of crane, by analyzed the current variant design methods, a product-level variant design method was presented based on product configuration technology, parametric design technology and modular product design. The theory and the flow of variant design were explained in detail. A variant design platform for portal crane was developed. Based on making the best of enterprise resource, the product design efficiency was improved and the cost of the production reduced.
Authors: Hong Jia, Yu Huai Wang, Yan Lin Lu
Abstract: CAE analysis plays an important role in die and mould manufacturing. In order to improve the modeling ability of the existing CAE analysis system, the paper presents a STEP based method by improving the integration ability of CAE systems and CAD tools. And an improved strategy for mesh generation is described and the application system based on the strategy is implemented. Results show that the presented method helps to not only improve the mesh quality but also increase the process efficiency and reduce the time cost.
Authors: Jian Lan Lei, Jin Wang, Guo Dong Lu, Shao Mei Fei
Abstract: Collaborative filtering (CF) technique is the most successful method for recommendation system. In this article, we developed a fashion recommendation system by using CF technique. In order to improve on data sparseness problems in CF technique, firstly we built users’ similarities based on users’ background information which is related with fashion, then the neighbors’ predicting ratings were filled into the U-I rating matrix in advance before the traditional collaborative filtering. While computing the background information similarities, we develop a hybrid similarity model which can deal with different types of properties. The method can solve the data sparseness of U-I rating matrix effectively.
Authors: Ye Tao, Sheng Wen
Abstract: In this paper, the coupling electromechanical model is proposed for a cantilever microbeam in microelectromechanical system (MEMS). Based on mechanics of plate and theories of electrostatic field, the coupling electromechanical behavior of the cantilever microbeam is investigated. The pull-in voltage is accomplished using the increment-iterative method. The effectiveness of the proposed method is verified by comparing numerical results with that in the literature. The numerical results show that the pull-in voltage decreases with the improvement of the ratio of the width of micro beam to the initial gap between the electrodes.

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