【正文】
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Development cycle time from the last 8 years reduced to five years, including the engineering design of the virtual assembly process in the development of ideas played a significant role. Virtual assembly (Virtual Assembly) is a digital product definition of an important link in the field of virtual and simulation technology has been widely used in the study. Usually there are two kinds of definition: (1) Virtual assembly is a binding relationship between the part model by the process of repositioning is an effective analysis of product design as a means of rationality. This definition emphasizes the virtual assembly technique is a model of reorientation, the analysis process. (2) virtual assembly design is based on the shape of features, precision features, truly threedimensional simulation of product assembly process, and allows users to interactively control the products of threedimensional simulation of the real assembly process, to test the product for Assembly. In this paper, the characteristics of we