Abstract
Interference matrix (IM) is an important assembly relation model to automate the assembly sequence planning (ASP). For a complex product with numerous parts, the creation of IMs is time consuming and error prone. Thus, a method is proposed to accurately and quickly generate IMs from a CAD assembly model. First, an improved IM model considering interference quantity is used to discriminate fake interference caused by CAD model errors. Second, the algorithm to automatically generate IMs is presented, in which a collision detection (CD) method is designed to quickly determine interference relationships between parts. This CD method involves three novel methods: extended cruciformly overlapped axis-aligned bounding boxes (COAABBs), improved pseudo face (PF) and hybrid facet projection intersection test. And a system called AutoAssem is utilized to implement the proposed method. Finally, the case study of a gearbox demonstrates that this method can extract IMs from the inaccurate CAD models for accurate ASP. Moreover, case studies of complex products like the milling machine verify that this method is much more efficient than the current methods and greatly shortens the data preprocessing time of ASP.
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