Method for Automatic Generation of Assembly Interference Matrix of Complex Products

doi:10.3901/JME.2016.01.139

Abstract

Abstract: Current methods for automatic generation of assembly interference matrix are time-consuming and also inaccurate to detect faceted models, so they are ineffective to complex products with large assembly models. Thus, a projection based interference detection method is introduced to convert the 3D intersection problem to a 2D one. In this method, the hard interference caused by translating parts can be directly determined based on cross bounding box overlap check, which expands the capabilities of the bounding boxes. Moreover, the hierarchical pseudo faces are used to partition the faceted models into sections for intersection check, by this way, the facet intersection test times are greatly reduced and so the interference detection time is considerably shortened. Then, the representation tolerance based 2D facet intersection test is executed to eliminate the fake interference between object pairs with touched curve surfaces. And the facet bounding boxes etc are used to determine whether positive or negative axis direction in which the relevant interference occurs. Based on the proposed interference detection method, an overall assembly interference matrix generation algorithm is presented. And an assembly design system called “AeroAssem” is developed to implement this algorithm. The precision and efficiency of this method are demonstrated by an automobile front axle case, proving that it can be effectively applied to the assembly design of complex products.

Key words: assembly interference matrix, assembly sequence planning, bounding box
, interference detection

CLC Number:

TP391

ZHANG Wenlei, QU Rongxia, XU Meirong, LUO Xiaochuan. Method for Automatic Generation of Assembly Interference Matrix of Complex Products[J]. Journal of Mechanical Engineering, 2016, 52(1): 139-148.

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