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Quality is Critical
by Courtesy of AIA Member Company, GÖPEL Electronic GmbH - GÖPEL Electronic GmbH Posted 04/20/2010
BAE Systems (United Kingdom) is a global defense, security, and aerospace company with approximately 107,000 employees worldwide. The company delivers a full range of products and services for air, land, and naval forces, as well as advanced electronics, security, information technology solutions, and customer support services. In 2009, BAE Systems reported sales of £22.4 billion. The UK-based business in Rochester/Kent supports the UK armed forces with head-up displays for civil and military jets and flight control computers for airplane landing and takeoff.
All printed circuit boards (PCB) for electronic equipment are designed and produced in Rochester. As the product portfolio of BAE Systems is extremely wide, it means about 90 different types of PCBs are manufactured a year. This also places high demands on their product quality, as precision, functional reliability and system stability play a critical role in these products.
BAE Systems runs three production lines. Until 2008, PCB inspection was executed manually in addition to electric in-circuit test and functional test. The test engineers at BAE Systems decided on utilizing a system for automated optical inspection (AOI). In particular, the ability to check solder joints was highly critical and an important criteria for making this decision.
The BAE Systems engineers considered and evaluated quite a few systems and finally focussed on four AOI vendors. Even though most systems were similar, after intense evaluations the test engineers decided on an AOI system by GÖPEL Electronic GmbH (Jena, Germany). Robert Driscoll, Test Engineer at BAE Systems says: “It was the best system available”. The machine’s advantage was its ease of programming, fast test times, robustness and reliability as well as “painless installation”, adds Steve Rodwell, Test Engineering Team Leader of the PCB department, adding “It came out on top for us”.
BAE Systems decided on the stand-alone machine OptiCon BasicLine, because the system had to take the output from all three production lines. After six months when production and complexity increased, the off-line machine’s capacities didn’t match the requirements any longer. “Hundreds of boards a day were simply too much to be tested with the OptiCon BasicLine”, says Robert Driscoll; hence the decision fell for another AOI system but this time with in-line capabilities.
Again a system from GÖPEL electronic was purchased, an OptiCon AdvancedLine that is employed in the production line of high-volume batches. But the OptiCon BasicLine is still used for surface mounted device (SMD) inspection and the presence of through-hole technology (THT) components for the other two lines. Additionally, the stand-alone system is used for test program generation. More than 180 programs have been generated at BAE Systems. Thus, test programming is executed at the offline machine and transferred to the inline system. Furthermore, there’s no time for rewriting programs when system changes occur. Such tasks coupled with program fixing/updating are done with the OptiCon BasicLine offline.
Today, all possible inspection tasks are done with the AOI systems – most importantly device ID checks and polarities (including diodes and capacitors). Historically, about 75% of all defects found by in-circuit test and functional test were related to SMD faults. Now these are captured in real time at the end of the line, with a false-call-rate of less than one percent. The AOI systems clearly identify where the faults are occurring and the defects are stored in a library for traceability. Steve Rodwell says “Every project or product demands short test processes, and the GÖPEL systems meet them.”
In terms of software, the recently introduced SPC (Statistic Process Control) module is efficiently used to optimise the production process. For example: the BAE Systems engineers needed to know what kind of faults occur the most. After utilizing the AOI system they found that it was mostly solder defects, which finally resulted in changes in the manufacturing process.
“As it is, it’s efficient, easy-to-use, user friendly and fast, it exceeded our expectations, and is great to work with”, Test Engineer Robert Driscoll states about the work with the AOI systems. Steve Rodwell adds “We’re happy with the machine, its reliability and the great support here in the UK”.
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