Advanced Materials Research Vols. 201-203

Abstract: Based on the polychromatic sets theory, a relational model of cutting-tool choice was established, which was shown with a contour Boolean matrix. Through the coloring logical operation, the cutting-tools candidate set was calculated to meet machining conditions. With the candidate cutting-tools set, the fuzzy optimization was made for every part feature. And with considering the effects of the time of cutting-tool exchange, processing sequence and other relevant information for the selection of cutting-tool, the choice of cutting-tools is optimized as a whole during machining.

Abstract: Woven fabrics are used in a wide variety of products, and they are prized for their flexibility, formability, and high specific strength. However, modeling woven cloth is difficult due, in particular, to complex mechanical properties. In this paper, the shear behavior of plain woven fabric is studied. Through the analysis, a mechanical model is proposed which take the shearing properties into account. It uses physical-based model for animating cloth objects. Furthermore, we demonstrate the efficiency of this method with examples related to accurate cloth simulation from experimental shear curve measured on actual materials.

Abstract: In this paper, the study of numerical simulation method used in jet molding CAE major technology is carried out, including simulation of filling flow process, keeping the stress process, cooling process, warping deformation and molecular orientation and so on; also makes a system induced study on injection molding CAE successfully applied in the injection mold design.

Abstract: A CAD/ CAM system has been developed for turbine blade’s manufacturing based on the software of UG in accordance with a type of static blade of China Chang Jiang Energy Corp. (Group) in this paper. According to a few parameters input by users, the system automatically generate three-dimensional geometric model of the blade, and through its CAM module, it automatically generates the CNC track for four-axis CNC machining center. A management system has been developed by using UG / Open API, MFC, and database technology so as to improving the design efficiency in the UG.

Abstract: A new type of excavator is introduced in this paper aiming at solving the problems the hydraulic excavator and traditional mechanical excavator (also called Electric Shovel) have respectively, which are hydraulic leaks and high maintenance cost of the former one and the lack of flexibility of the latter one. The analysis of the proposed novel excavator is carried out including: Degree-of-Freedom (DOF) of the new mechanism by constraint screw theory, inverse kinematics using the method of constraint equations, velocities and acceleration. A simulation study is proposed based on the analysis above. Results show that: the new type of mechanical excavator has the ability to achieve flexible trajectory output within its workspace.

Abstract: The method of laser inner engraving path generation and simulation for crystal glass is presented based on STL(Stereo Lithography) model. To generate the laser exposure points that are adaptive to the surface of model, the contour lines are obtained by cutting the STL model with unequal distance using a series of plans that are perpendicular to Z-axis. Then the contour lines are offset and scattered, and then the path is generated by sorting and connecting each discrete point in order. Simultaneously, simulation method of laser inner engraving for crystal glass is also proposed. The case studies show that the method can primely realize the engraving path generation and the simulation for the laser inner engraving of crystal glass, and that the system runs stably and reliably.

Abstract: This paper introduces a new, visualized approach for including all the geometric feature variations in the tolerance analysis of mechanical assemblies. It focuses on how to characterize geometric feature variations in vector-loop-based assembly tolerance models. The characterization will be used to help combine the effects of all variations within an assembly in order to perform tolerance analysis of mechanical assemblies by employing commercial 3D kinematic software (e.g. ADAMS). Equivalent variational modeling, based on TAKS method, has been developed for modeling variations in 3D mechanical assemblies. Create a library of Equivalent Variational Joints (EVJs) to allow inclusion all kinds of variations in analysis, and allow the kinematic model to include both geometric and dimensional variation in a velocity analysis. EVJ, for use in tolerance analysis, was developed for commonly used 3D kinematic joint types, and was implemented with examples to explain their use to form Equivalent Variational Mechanisms (EVMs).

Abstract: Computer simulation is a new research approach for corrosion science. A simple model is proposed to describe uniform corrosion process which is a common corrosion failure type for carbon steel. As a lot of chemical and physical processes take place during corrosion reaction with complexity and random, we have to simplify the complex process to establish a math model which is suitable for a simulation calculation. The computational model based on cellular automata (CA) approach uses local rules to govern the electrochemical reactions, and simulate the corrosion system as a discrete dynamical system. As a result the simulation computational solution is compared with experimental data in this work, both of which show the same characteristics of data distribution. The results presented the feasibility of the cellular automata approach to simulate the corrosion process and to describe change of surface topography in company with the increase of corrosion quantity.

Abstract: Although TRIZ has obvious advantages over other current known innovative ways in the following aspects: high-efficiency, high degree of controllability, the design staff still has difficulties in using the TRIZ tools, such as matrix technology to solve conflicts, TRIZ algorithm, or even combining the Inventiontool 2.0 Technology Innovative software to design creative programmers, value innovative programmers. This paper, on the basis of introducing the TRIZ theory, analyzes the characteristics of TRIZ theory, introduces the use and application of the process about a computer-aided software product of innovation --Inventiontool2.0, then point out the difficulties in the theoretical innovation based on TRIZ and bring forward the direction of amelioration.

Abstract: The tolerance analysis methods are usually used to test the result of product design and assembly; moreover the tolerance analysis also is a fundamental technique in precision design process. So far, there are two kinds of tolerance analysis methods: statistical tolerance analysis and worst-case analysis; they have their own characteristics and drawbacks. In this paper, it presents a nonlinear tolerance analysis method which uses Matlab tool to construct the nonlinear tolerance analysis mathematical formulation and calculate the result of nonlinear tolerance analysis based on the principle of worst-case tolerance analysis. All the processes are dealt with and tested by computer. The engineers only enter some basic parameters through the standardized interface, and then the result can be obtained without artificial intervention. In addition, the accuracy of calculation result meets the production requirement. The system of the nonlinear tolerance analysis is easier for engineers to use.