Manufacturing Cost Analysis of Surface Mount PCB Designs

A product’s design influences its manufacturing process and the associated costs. Consequently, desigr engineers need to review their designs from a manufacturing perspective. While ‘Design For Manufacturing’ (DFM) tools ofter identify the manufacturing problems associated with a design, they would be more effective if these problems could be reoresented to the desianer in terms of a cost value This research developed a cost estimation tool for the designer in the surface mount printed circuit board (PCB) domain by integrating computer aided design, computer aided process planning (CAPP) and cost estimation techniques using a knowledge based framework. The cost estimation can be done in two design stages. First, an initial approximation of the manufacturing cost can be obtained using information such as the component mix, type of substrate and the size of board. After the detailed design of the PCB has been developed, a more accurate PCB assembly cost can be obtained using computer aided design (CAD) data. Both cost determination strategies would require the generation of a macro-process plan. The cost advisor considers tangible and intangible factors. This cost advisor and the DFM environment have been developed using C ++ and object oriented programming constructs under the MS Windows operating system.