Abstract
This paper describes a system, agips (Automatic Generator for Insertion and Placement Sequences), which can immediately evaluate the manufacturability of printed wiring boards (PWB) at the design stage by examining potential collisions and then generate collision-free insertion sequences within reasonable computation time. The input files come from three different sources: PWB CAD database, machines and set-up specifications, and process planning. The sequences generated by agips can be translated into NC codes to drive the NC assembly machine. In agips, the PWB assembly sequence problem is considered at three hierarchical levels: machine sequence, machine head sequence, and component sequence. During collision checking, three directed arcs representing the precedence relationships among assembly machines, machine heads and components are generated to avoid a collision if any occurs. The developed agips can automatically generate collision-free sequences and provide immediate feedback to the PWB designer the producibility of a design. An example is given to illustrate agips's abilities.
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