Advanced Materials Research Vols. 889-890

Abstract: In order to improve the bearing capacity and service life of the locomotive traction gears, modern design methods are used to optimize the gear tooth curves and their parameters. The simulation of the involute tooth curves and tooth root transition curves of the traction gears are build by Ansys Parametric Design Language (APDL). It can accurately describe the finite element model with complex geometries. It laid a solid foundation for the tooth strength analysis and modification.

Abstract: Reverse engineering is a process of using 3D geometric modeling method to reconstruct actual objects CAD model based on these points, which is used physical digital measuring equipment to measure the three-dimensional coordinates of points on the surface of the object accurately and rapidly. Based on reverse engineering technology as the theoretical basis, the paper used three-coordinate measuring machine to measure ashtray surface data. After data was be handled, which was used to reconstruct 3D entity in Pro/E software. Last, the 3D entity of ashtray was printed out through rapid prototyping machine, which can be achieved by physical sample to rapid manufacturing of products, shortening production cycle, reducing production costs.

Abstract: Rapid Prototyping (RP) technology makes it possible for manufactories or Institutes conceiving the product directly from its CAD models without any tooling or human interference. This study explored the modeling process of toy aircraft based on Pro/Engineering through a component drawing, introduced the basic setups of Fused Deposition Modeling (FDM) process by using a rapid prototyping machine. Summarized the advantages and shortages of FDM,point out that the method using CAD&RP technology may be useful in designing a new product , it promising development in making of complex component or mould, and the need of colorful materials used in RP.

Abstract: The precision cam divider is mainly used for intermittent indexing step motion between two vertical staggered shafts and extensively applied in machinery of textile, package, tobacco, food, pharmacy and machining center, etc. [ [. With progress of modern science and technology, higher speed, efficiency, life and quality are required for mechanical transmission mechanisms on automats and automatic lines, as a result, higher requirements are raised for properties of the precision cam divider. In spite of advantages of high transmission speed, high locating precision, high indexing precision, good reliability, good dynamics performance, simple structure and long lifetime, etc. of the precision cam divider, artificial design is very cumbersome, in which design and machining of globoidal indexing cam are more complicated [ [. This paper develops CAD/CAM system for globoidal indexing cam by means of Pro/E system development platform and parameterizes design of globoidal indexing cam and transposition disc so as to simplify design interface and shorten design cycle of product, and mean while performs dynamic assembly, simulation and test of product performance to improve product quality and operating efficiency.

Abstract: The modeling of complex 3D details is a time-consuming task and need enough experience. In this paper, an effectual algorithm is proposed to transfer and reuse 3D geometrical details with cubic B-spline wavelet. Firstly any kind of surfaces both from the source model and the destination one are represented with cubic B-spline wavelet, and then they are decomposed into a base shape and several hierarchies of details. Since both models share the same basis of wavelet, they can be combined into one model in different hierarchies. Hereby the details are transferred onto the new 3D models. Later experiment shows that this technology can obtain desired resultant models.

Abstract: An effective biarc approximate tool path generation algorithm is presented for polyhedral models. A series of sections intersect the offset surface of polyhedral models to obtain the initial tool paths. The path interval is calculated by the curvature radiuses and scallop height for offset surface models. Within the range of fitting precision, based on the biarc fitting constraint condition and adjustment parameter of curvature, iteration method is used to determine adjustment parameter of curvature radius. So the last radius for biarc is obtained for fitting the initial tool paths. Example shows the method can keep G1 biarc approximations tool path and fewer biarc segments, so the machining efficiency is improved.

Abstract: Current steel structure design software cannot calculate sectional properties of user-defined section of cold-formed thin-wall steel accurately. Since the sectional properties data given by design code has been implanted into corresponding modules of these software and the software disregard the radian of corner of steel, erroneous results will be generated if the user-defined sectional size doesn't match the sectional size of the data file implanted. According to Green's theorem, the author derived precise formulas for sectional properties of arbitrary section and developed software for calculation based on Visual C++ platform. The software which can calculate exact solution of sectional properties of arbitrary section has been verified by comparing results from various methods. This software can be used independently as a calculating tool and the calculation module can be implanted into other steel structure design software to make calculation for sectional properties of arbitrary section possible.

Abstract: In this paper, a passenger cars side impact CAE model was built with LS-DYNA software according to Chinese New Car Assessment Program (C-NCAP), the model was correlated very well with the test based on the data of B pillar intrusion velocity and the deformation of B-pillar and door intrusion. In order to improve the performance for side impact, the optimization proposal was provided after analyzing the results. It is showed that the side impact performance of the car was enhanced significantly after the optimization implemented.

Abstract: The virtual prototype model is established for the induction station system of the parcel sorting machine. The key problems of the belt modeling and the constraint between belt and bearing are solved. The dynamical simulation analysis of the induction station system is carried out using ADAMS software. Based on the position and velocity changes of the contact point between belt and the parcel, the dynamic performances for the induction station system are gained. This research saves the development costs and time, and provides theoretical basis for working parameter design of the induction station system.