Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Heatsink assembly pressing force

Yngwie

#22264

Heatsink assembly pressing force | 5 November, 2002

How to measure the max allowable force when we press the heatsink at the attachment process. I was posted with question by my customer, " how to I ensure that the force I use to attach the heatsink does not causing any damage to the solder joint on the IC's lead.

thank in advance.

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Dason C

#22268

Heatsink assembly pressing force | 5 November, 2002

We are using the custom pnuematic press to press the heat sink. You can use a force gauge to check the pnuematic cylinder or you can caluclate the force by the size of the cylinder, PI * squ R * Input pressure.

Depend on the attachment method, by adhesive tape or epoxy, it is required 10~15PSI for 5~15 sec.

Rgds. Dason

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