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The Next Assembly Line Robot - Antifreeze
Kirt's Cogitations™ #183

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   Cog·i·ta·tion [koj-i-tey'-shun] – noun: Concerted thought or
                                        reflection; meditation; contemplation.
   Kirt [kert] – proper noun: RF Cafe webmaster.


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The Next Assembly Line Robot - Antifreeze

Antifreeze now has a new use. Scientists at the University of Minnesota have discovered a way to exploit the surface tensions properties of ethylene glycol to cause pairs of components with complementary shapes to be attracted to each other and self-assemble. In an experiment, hundreds of LED chips and silicon carriers were mixed in a container of ethylene glycol, heated, and then shaken to cause the complementary LED/carrier shapes to mate while in the mixture. The system was then heated to a temperature that allowed solder dollops in the carriers to melt and make a connection to the LED die pads. After cooling and rinsing, the assembled parts were removed and inspected. 600 assemblies were produced in just two minutes - a 100% yield! A second and final similar step then assembled the LED/carrier pairs onto a surface-mount package and yielded 97%. This process is being considered for similar high volume manufacturing operations that involve parts too small to be efficiently handled with robotic or human means.
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