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The Next Assembly Line Robot - Antifreeze | ||||||
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These original Kirt's Cogitations™ may be reproduced (no more than 5, please) provided proper credit is given to me, Kirt Blattenberger. Please click here to return to the Table of Contents. Cog·i·ta·tion [koj-i-tey'-shun] – noun: Concerted
thought or  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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