Automatic Precedence Constraint Generation for Assembly Sequence Planning using a Three-Dimensional Solid Model

Abstract

The assembly sequence planning of a product can be generated through three phases: first, generating precedence constraints; second, searching for assembly sequence alternatives; and third, selecting the best assembly sequence. Assembly sequence generation needs precedence constraints in order to find a feasible assembly. A collision between two components can cause the blocking of one by the other after assembly. This research proposes an automated method for generating precedence constraints. The method employs certain information: the collision-free assembly path; the number of connections between components; and component volume. This information is extracted from the CAD (Computer Aided Design) database. The methods resulting from the research will be used to develop an automated process of assembly sequence generation using a three-dimensional (3D) solid drawing in the form of a stacked drawing in a CAD system.

Keywords

• Assembly sequence
• CAD
• Collision detection
• Precedence constraint