Advanced Materials Research Vols. 102-104

Abstract: Casting process of the gearbox shell of a drill is simulated based on different technological conditions by analysis software ProCAST and orthogonal experiment method. The optimizing target is the shrinkage. It can be concluded that the factors that affect shrinkage are casting temperature, casting velocity, mold initial temperature and the cross-sectional area of inner gate in the gating system. Through analyzing the diagram of factor levels influent trend which is described according the last simulated results, the most optimized process parameters scheme is got, and the process scheme is simulated.

Abstract: This paper takes the 2D image of toys and cartoons as reference to assist the amateurs to design 3D models fast and conveniently. A contour deep tracing algorithm is proposed for acquiring the whole contour, and Ferguson interpolation curve is introduced to fit the contours. Taking the control points of Ferguson curves as reference, amateurs can easily sketch curves that fit to the image contours. Decomposing the extracted contours into several feature regions, the users can draw some enclosed component contour curves of the target toys or cartoons, and then adopt proper methods to generate the 3D mesh of components. Three modeling methods, namely local deformation, symmetric deformation, and 2D FFD deformation, are introduced for modeling the 3D surface fast. Ferguson curves are also used in 3D painting on triangular surface, and large regions enclosed by the painted colors can quickly be filled with a target color. The users select a region of the image and drag them onto 3D models, and then the details, such as eyes, nose, and artistic patterns can be easily painted.

Abstract: The 40 inventive principles of TRIZ are useful methods for solving engineering design problem. 3D garment CAD is significant for improve the efficiency and level of fashion design. This article describes the application of these principles of TRIZ in three-dimensional garment CAD. Based on the characteristics and requirements of fashion design, the author analyze the basic meaning of these inventive principles, and use them in the research and application three-dimensional garment CAD, such as decomposition and combination of virtual apparel components, clothing structural design, setting of clothing color and pattern library, inter-conversion between three-dimensional mesh of clothing and two-dimensional pieces and so on. Some examples show that the application of these principles is feasible and effective.

Abstract: According to the characteristics of integrated reverse engineering system, the architecture system of integrated reverse engineering which oriented to products rapid development is established. The composition of the system and the function of the function modules was discussed, and the overall framework model of the system was designed. Aiming at the key technologies such as in-kind digital methods techniques, models innovative design and reverse manufacturing, this paper make briefly analysis.

Abstract: Concidering the inadequate of the turbosupercharger, a novel reconstruction method is proposed, and the layout of the turbocharger is developed, considering the connection of the turbocharger and technics, the design scheme for the turbocharger is presented by using the reconstruction method, the present analysis provide the thoery base for the applications of the turbocharger.

Abstract: Conventional methods for diagnosis and operation planning based on 2D image are still widely used in oral and maxillofacial prostheses surgery, and the accuracy and efficiency are needed to improve eagerly. Aiming at this problem, rapid prototyping (RP), a technique of advanced manufacturing, is applied to fabricate the physical model of bone, and which is used to simulate the operation further. The procedure of RP based precise surgery is presented, and some key techniques including CT image processing, 3D bone model reconstruction, repairing model design, physical model fabrication, pre-operation simulation are discussed in detail. Total 25 successful clinical applications illustrate that, with RP based precise surgery methodology, the efficiency and quality of oral and maxillofacial prostheses can be improved effectively.

Abstract: he Al-6061-T6 tube’s drawing limit and the drawing process’s elasto-plastic behavior were investigated based on the foundational theories of larger deformation and continuum damage mechanics. A mathematical computation equation about the maximum Cockcroft-Latham damage value was converted to an appropriate discrete expression which is easy for FE code to programme, thus the corresponding finite element numerical algorithm for damage computation was developed. By an approach that physical experiments and numerical simulation provide mutual support for the critical damage value, the crack criterion of Al-6061-T6 was evaluated as 1.34. The crack criterion obtained was introduced as important design considerations of tube drawing process. An 3D graph which reflects maximum damage variation according with the diameters at different tube thickness was achieved, according to which the drawing process’s safe and unsafe areas of Al-6061-T6 tube with diameter 10mm at temperature 20°C and drawing velocity 100mm/s was ploted.

Abstract: The suction plastic forming process for in-mold decoration plastic sheet has been the best process for thin-shell plastic exterior decoration parts. But the suction plastic forming products still suffers from the uneven thickness. Based on the general finite element analysis software POLYFLOW for viscoelastic fluid, a set of optimization methods for suction plastic forming process of in-mold decoration plastic sheet is introduced in this paper to reduce the uneven level of thickness. These methods include establishing process optimization scheme, building mesh model, selecting the material constitutive model and determining its parameters, imposing boundary conditions and blowing pressure, and applying the mold movement. Finally, the optimized suction plastic forming process is used to produce the in-mold decoration plastic rear bumper sample of an automobile, and the results show that optimized process is effective and applicable.

Abstract: There is no fixed form for circles not parallel to drawing, with the lens ellipse, and perspective ellipse changes with the size of circle, distance from the screen angle and the relative location of sites location. It is a hardful thing both for manual and for computer graphics. A mathematical model procedure is developed according to the perspective transformation, as long as inputting size of circle, distance from the drawing (coordinates) to the relative angle, as well as site location (coordinates), other parameters to determine the size, and the direction and position of perspective ellipse is determined.

Abstract: In the detection process of the ball detector, surface can not unfold effectively, which brings about that the camera can not capture the image which we want, resulting in a high rate of defect and at a low efficiency in the test with the ball detector. In order to solve this problem, the optimized design on the mechanical control parts of the expansion organization was carried out, besides, kinematics analysis model the expansion organization and a motor control timing schedule were created by ADAMS, enabling expansion process consistent with the mathematical modeling. To a certain extent the optimization results improve overall performance of the system, which plays a guiding role in the improvement of the system.