Study On Key Techniques Of Shape Reverse Seeking Oriented Rapid Prototyping Manufacturing

To shorten the period of product development is a premise to win the market competitive advantage with guarantee. The rapid prototyping manufacture (RPM) technique is favor by people because of its nimble speed and high flexibility. For some complex samples,it is very difficult or impossible to use some general shape software to reconstruct their CAD models directly. The development of reverse engineering (RE) techniques provides RPM with the data source. The effective integration of RE and RPM forms a close feedback system composed by the design, manufacturing and examining. By design like this again and again, products will be more and more perfect in the end.At present, the technology of RE doesn't match RPM ideally because some techniques of RE cannot meet the need of RPM. It is necessary to improve the key techniques of RE. The main tasks in this paper are as follows: The rational function neural network is used to repair the measure data, and then the Matlab language is applied to programme to simulate experiment. The triangulation in space is a bottleneck problem. An effective 3D triangulation algorithm for scattered points is studied. It solves the problem that data points must be partitioned for multi-projection realized by traditional 2D triangulation methods. Three basic processing operations of 3D triangulation algorithm composed by boundary loop extending, splitting and closing finally are summarized. The triangulation for any type of surface is considered as the combination of these operations, which makes the algorithm have great adaptability and high efficiency. Triangular mesh optimization is also a key problem. A new concept about synthetical optimization of mesh is put forward. It emphasizes specially the optimization of the mesh shape in the space, making triangle mesh approach the primitive surface within the scope of accuracy. The method of smooth surface reconstructed based on the triangle mesh is studied and the application foreground of cubic Bezier spline surface in the field of RE is expatiated. Based on the thoughts of object-oriented programming, the mold-reconstruction system is developed in the integrateddevelopment environment of VC++6.0 with the OpenGL saddlebag, and the friendly software interface is designed.The study on key techniques of shape reverse seeking oriented rapid prototyping manufacturing presented in this dissertation are tentative and exploring, which is significant in theory and practice for improving the reverse technique and in our country.