March, 2015
www.us-
tech.com Keeping Ahead With Forward-Looking Manufacturing Decisions Gary Walker, Vice-President, JEMS,
www.javadems.com J
AVAD Electronic Manufactur- ing Services (JEMS) was found- ed four years ago, during an eco-
nomic downturn, with the belief that investments in manufacturing equip- ment were necessary to keep pace with customers’ requirements. Even though used equipment was avail- able at low prices, the company pur- chased only new equipment that could meet the future challenges of the most complex products and tech- nologies. Advanced equipment and
processes allow JEMS to build ad- vanced products with the highest levels of quality, regardless of the type of build: all customers’ products are built to the same set of demand- ing standards. Although JEMS can- not entirely eliminate human inter- vention in the manufacturing pro - cess, it attempts to provide its oper- ators with the most advanced au- tomation, knowledge, and repeat- able/defined processes available to help achieve the best results. As an example, JEMS added
Aegis (
www.aiscorp.com) manufac- turing execution system (MES) soft- ware that provides detailed work in- structions at point-of-use locations on touch screens, from the screen printing process all the way to the pack-out process for a finished prod- uct. This guarantees that all opera- tors are using the latest revision doc- ument and that the process parame- ters have been clearly defined and validated, for continuity and consis- tency from job to job. The workflow- based system helps establish a clear- ly defined process for each product. By placing bar-code serial numbers on every board that is processed, the company not only tracks finite qual- ity details to individual circuit boards but also controls the flow of each and every product, ensuring no missed steps or “walk-arounds” for different process steps. The MES functions as a live system, with process and quality data constantly updated, supporting process moni- toring and control on any of JEMS’s four production lines.
Software Defines Parameters The Aegis system defines all
parameters for the screen printing process for printed-circuit-board as- semblies (PCBAs). Many industry studies show that 60 to 80 percent of surface-mount (SM) solder joint de- fects are due to screen printing prob- lems. Fortunately, the Automatic Pin Guidance (APG) function of EKRA X4 screen printers used at JEMS has significantly reduced in- stances of insufficient solder and open solder defects caused by inap- propriate screen printing setups for double-sided circuit assemblies. These screen printers incorporate a vision-mounted laser pointing sys- tem and allow pin locations to be programmed via the vision system. According to a comparison study of EKRA APG implementations per- formed at JEMS, insufficient solder and open solder defect instances on PCBs were reduced by 55 percent when using APG compared to boards processed without APG. The repeat- able process supported by APG helps
engineers discover the true root cause of printing defects and to im- prove the quality of repeat builds as part of the learning process. To validate its screen printing
The production floor, showing several automated production lines.
process, JEMS installed a fully auto- mated CyberOptics three-dimension- al (3D) solder-paste-inspection (SPI) system on every SM line. This was felt to be one of the more critical points along the electronic product production line. Not only is it a point at which the registration of paste is being checked, but the volume of
Continued on page 46
Page 25
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ORANGE COUNTY CONVENTION CENTER MARCH 23-27, 2015 South Hall, Orlando, FL Visit us at Booth S28073
WACKER’s LUMISIL®
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• Allows light to pass through virtually unimpeded • Withstands prolonged exposure to temperatures up to 200 °C • Remains permanently elastic at low temperatures • Remains colorless even at high temperatures, resists aging and weathering • Ideally suited for large-scale injection molding and conventional manufacturing processes
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Wacker Chemical Corporation, 3301 Sutton Road, Adrian, MI 49221, USA TEL: +1 888 922 5374, FAX: +1 517 264 4068
www.wacker.com/lumisil,
info.usa@
wacker.com
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