Designing a Hard Disk Drive Kinetic Air Particle Detachment System Using Finite Element Analysis
The removal of particulate contaminants adhering to a surface has been investigated using an air nozzle jet and purge particle system before assemble Head Stack Assembly to be final Hard Disk Drive finished good. These technical and economic challenges have driven cleaning process development away from chemistries and also maintain high particle removal efficiencies with reduced material loss, pattern damage. Finite element is using to study detachment of deposited particles in turbulent air flows and use this numerical model to design system more effectively. The experiment is established to study the removal effectiveness of system. Removal of the contaminants was observed by optical particle counter and quantified type of particle through digital image analysis. The experimental results showed that air particle purge cleaning performs well for surface cleaning. The particle removal efficiency of air cleaning and purge particle increases with elapsed time and it is well correlate to critical set up parameter such as pressure, velocity, pulse interval and cleaning duration time. The optimum pressure is defined to ensure no harmful to mechanical damage. The removal efficiency was detected higher for submicron-sized contaminants and well correlate to drag force. The success of this system could be further benefit for particle cleaning and process improvement resulting to product reliability improvement.
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