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x | 15 Design for Manufacture and Computer-Aided Design INTRODUCTION The use of computer-aided design CAD systems computer graphics and computer-aided drafting has become widespread in industry to the extent that they are now an integral part of the product design process in most companies. As a result there is obvious interest in closer integration of the design for manufacturing and assembly DFMA analysis procedures described in earlier chapters into this CAD-based design environment. In particular some of the information required for DFMA analysis is geometric and may be available directly from the CAD part data. However even with current CAD systems considerable time and effort is still required to enter and design all parts and subassemblies of a product. If the initial DFMA analysis is left until all or most of these data have been entered into the CAD system it may be too late as there will then be a considerable reluctance to implement any substantial design changes in the product. An important consideration is how to integrate the DFMA analysis early enough in the design process to have the most benefit. GENERAL CONSIDERATIONS FOR LINKING CAD AND DFMA ANALYSIS In considering the possible links between CAD systems and DFMA analysis it is useful first to review the manner in which these systems currently operate in 643 I Marcel Dekker Inc. 270 Madison Avenue New York New York 10016 644 Chapter 15 particular if the purpose is to impact the concept stages of the design of new rather than modified products. DFMA Analysis Analysis of a product for manufacture and assembly consists of two main stages design for assembly DFA and early assessment of component manufacturing costs DFM . Design for Assembly Analysis DFA analysis is aimed at Product structure simplification and part count reduction Detailed analysis for ease of assembly An essential feature of DFA methodology is analysis of the proposed product by multidisciplinary teams. The analysis .

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