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High Volume Ball Placement Method

In this technique, solder balls and flux are preloaded into a specialty pick and place machine designed to place solder balls. The machine is loaded with the proper paste flux and correctly-sized and alloy solder balls. After programming a temperature-controlled solder flux dispenser, a controlled volume of paste flux is dispensed onto each of the component pads. This is followed by the pick and place machine precisely placing the balls into the flux. Tooling for the machine is made to hold an array of solder balls. The machine needs to be loaded with enough of the correct solder balls as well as being loaded with the proper flux paste. The machine will continue to run as long as these inputs are being properly fed.

MATERIALS REQUIRED
  • Pick and place machine for solder balls
  • Solder balls
  • Tacky flux
  • Machine holding fixture
  • Reflow oven
  • Stereo microscope
HIGH VOLUMER REBALLING PROCESS FLOW

high-volumne-reballing-method

The process below is generic in nature and is adopted to the customer specifications, lot size and the type of component being reballed

  1. Incoming inspection procedures per job order, customer requirements.
  2. Pick and place holding fixture engineered and fabricated
  3. Deballing process specified based on the component/customer requirements or industry specifications is completed
  4. Component inspected
  5. Component cleaned
  6. Components placed into fixture. Water soluble paste flux loaded onto machine. Solder balls loaded into pick and place machine. Machine programmed.
  7. Reflow of solder balls based on alloy used
  8. Post ball attach monitored cleaning process based on the flux chemistry utilized to clean device
  9. Device inspected per acceptance criteria
  10. Component baked out, marked if required and packaged per customer requirements

The high volume reballing method is used when a large number of the same part pattern device need to be reballed. When there are smaller package components this is a preferred technique as the machine can continue to run with a machine operator as opposed to a highly skilled rework technician. Other reballing process considerations and analytical testing can be found here.