Issue link: https://iconnect007.uberflip.com/i/1129312
14 PCB007 MAGAZINE I JUNE 2019 • Design for Assembly to analyzes party placement, support multiple machine configuration, analyze machine capacity, and provide production engineering documentation The emerging data transfer environment is from the enterprise's central database called product data management [10] . Figure 6 illus- trates this new data movement condition. PDM software integrates all data required to design, manufacture, and support a product, such as: • Simulation and models • CAD and CAE data files • Materials, processes, and characteristics • ECOs, revisions, parts, etc. Digital Twin Digital twin is the activity of doing trade-offs and simulations. It focuses on: • Product definition and system partitioning (technology trade-off) 2. Relative cost index (RCI) is an artificial currency that indicates the magnitude of price changes between two or more design alternatives 3. SMT Assembly The major metric of SMT assembly is the as- sembly report card—a predictive, comprehen- sive set of metrics. The 10 factors are based on a total point scheme derived from assembly costs. The points affect quoted prices to the following extent: • 0–45 points: +20% • 46–60 points: +10% • 61–75 points: -10% • 76–100 points: -20% A second typical metric is assembly com- plexity [8 & 9] . This is defined as leads per square inch (LPI). The listed references provide the data for a regression model of the average cost per lead versus assembly complexity. Proposed Approach Emerging assembly and fabrication smart digital systems—such as CFX, CAD Master, CAMStar, CADMaster, and individual software solutions—offer a new opportunity to imple- ment DFMA. As mentioned earlier, I call these modern frameworks concurrent manufactur- ing to differentiate them from concurrent engi- neering. The framework of concurrent manu- facturing is shown in Figure 5. The important role concurrent manufactur- ing plays in DFMA is illustrated by the module product information exchange (PIX). Its role is to: • Communicate information between design engineering to manufacturing, manufacturing to design engineering and other manufacturing, and subcontractors • Automate CAD data exchange and revision archiving • Provide product data tracking and packag- ing completeness checking, and support standard industry networking Figure 5: Concurrent manufacturing framework. Figure 6: Emerging data transfer environment.