| With the popularization and development of computer technology in manufacturing, virtual assembly technology has been paid more and more attention in the field of digital design. Through the virtual assembly technology, enhance the assembly efficiency and quality, to in front of the actual assembly of discovering problems due to design assembly failure, reduce the cost due to the assembly of the product development, the product design cycle is greatly shortened, and enhance digital assembly of quasi real and immersed sense. In this paper, a virtual assembly sequence planning system based on geometric reasoning algorithm is established, and the related technologies and algorithms are analyzed and discussed in detail in this paper.In order to realize the system, first of all, we need to establish the assembly model in the virtual environment, this paper uses VC++ and Pro/E secondary development technology development the model information’s conversion interface, 3D modeling software Pro / E model information extraction, retained the Pro/E model of geometric information, assembly information and topology information, storage to establish database for virtual assembly planning system calls. Then in the system realized assembly sequence planning based on geometric reasoning algorithm, the acquisition of disassembly direction and the collision detection in the process of disassembly are two important aspects in geometric reasoning algorithm, in this paper, the specific implementation of these two aspects were described in detail, and introduced the constraint relation matrix and the direction of the oriented bounding box to realize the functions of these two aspects. And in this paper using MFC programming technology combines the virtual reality tool WTK, graphical user interface was developed, and the preparation of the peripheral refresh function, and successful use of peripherals(including keyboard, mouse, 3D interactive ball) to control the system model and the viewpoint, the entire software system integration, the establishment of the virtual assembly planning system VAPS. At last, the function of the system is verified by using the assembly model of the high speed gear shaft system established in the Pro/E environment. |
