Advanced Materials Research Vols. 201-203

Abstract: An analysis feature-based CAD-CAE integrated approach was proposed to solve the problems of rapidly CAE modeling for static and dynamic analysis process of machine tool. Firstly, analysis features were defined in CAD system and analysis feature library was constructed for machine tool and its structural components. Secondly, analysis feature model was constructed by attaching analysis feature to CAD model interactively. Finally, ANSYS parametric design language (APDL) file was generated automatically by mapping analysis features to APDL codes, which realized the integration of CAD system and ANSYS system. Based on application programming interface (API) of SolidWorks, a parametric CAD-CAE tool oriented to static and dynamic analysis of machine tool was developed, which realized parametric modeling and automatic analysis of machine tool and improved design efficiency and quality of machine tool.

Abstract: Effective secondary development is the key process for CAD application. But as a cross-disciplinary problem and new software development mode, secondary development based on commercial CAD software has new features compared with complete independent software development. From angle of software engineering, this paper summarizes demand of software engineering, standards to observe, software development flow, configuration of development team in the process of commercial CAD software secondary development. Finally, this paper presents the case of secondary development of AutoCAD standard base parametric system to illustrate the specific application of software engineering in detail.

Abstract: A new non-destructive measurement system of the homogeneous entity profiles was designed; it included the digitized minute entity cells and the delaminated measuring method for product profiles based on liquid. It is based on Archimedes' principle and lever principle and gravity moment, used optic system to collect images and calculated the verge profiles, combined the equations of the gravity moment and the equations of the center of gravity to reckon the 3D coordinate values of every minute entity cell in different layers by computer. By inputting the 3D coordinate values of the product into the related CAD software system, the 3D model could be obtained. The principles, hardware and software of the system were introduced in details about the measurement system of the homogeneous entity profiles.

Abstract: With continuous expansion of manufacturing scale, the scene data that virtual prototype system has to deal with is far beyond a single computer's processing power. To meet the requirements of large-scale simulation, this study designs a virtual prototype system based on PC cluster. The problems including software architecture of virtual prototype system, transformation of CAD model, scene graph management, real-time rendering of huge dataset, and so on are investigated in detail in this paper. Finally a prototype system has been implemented. The system is constructed by PC cluster and gigabit LAN. The aim of the system is to build a large-scale, high resolution, immersive virtual environment supporting users' virtual design and manufacture.

Abstract: This paper presents the models for the ultraviolet (UV) lithography of thick photoresists such as thick SU-8. Simulations for various lithography conditions have been conducted using these models based on the improved dynamical cellular automata method. Some experiments on SU-8 2075 layers under UV source with 365nm wavelength have been implemented to verify the simulation results. The results confirm the validity of the proposed models.

Abstract: The method of computer-aided design oriented to requirement configuration is present for the palletizing robot. Index of design requirement is quantified hierarchically. The whole function of palletizing robot is decomposed according to the working plane. The various kinds of attributes of function carriers are digitized and the consistency is kept with the index of design requirement. Optimal design scheme can be gotten by the computation of evaluation function constructed in this paper. The software of computer-aided conceptual design for palletizing robot is developed.

Abstract: The article introduces three design techniques of variable pitch & groove depth & groove width screw. We found parameterized mathematical model of the type of heterotypic screw by analyzing and computing. Then it can realize to CNC machining of variable pitch & groove depth & groove width screw on lathe.

Abstract: Three-dimensional Reynolds-averaged Navier-Stokes simulations have been performed to explore the aerodynamic characteristics of ramjet projectiles. The turbulence model used is the RNG k-ε model. The numerical algorithms termed total variational diminishing (TVD) was adopted. The complex wave structures of ramjet projectiles with different architecture at different inflow Mach number were achieved by numerical simulation. The influence of inflow Mach number on aerodynamic characteristics and pressure center of ramjet projectiles were analyzed. Results show that lift coefficient and pressure center increase with the argument of inflow Mach number. Ramjet projectiles with different architecture have different drag coefficient trend.

Abstract: The study of parametric die-base developed on SolidWorks is presented in this paper. Here Visual Basic 6.0 is selected as the development tool, and the handle of a die is taken as an example to describe the design process with dimension driving. Users may create a series of standard-parts automatically by inputting different parameters through the application interface developed with VB.

Abstract: A method of the digital simulation for the sheet metal CNC incremental forming was proposed based on the Z-map model. The tool extrusion movements were divided into two types according to the principle of sheet metal CNC incremental forming, i.e. vertical movement and horizontal movement. The vertical and horizontal swept volumes of the tool were built to intersect with the Z-map model of sheet metal respectively and the simulation models were generated. The thickness of deformed sheet metal was predicted and the thickness distribution chart was generated. The case studies show that the method can be applied to NC code verification, forming parameters optimization and formability prediction, moreover the system runs stably and reliably in the whole simulation process.