Research on control of crimping hole aperture on printed circuit boards with high aspect ratio
The design engineers design crimping holes on printed circuit board(PCB).The aperture tolerance of crimping hole is generally required to be±0.05 mm.The compensation value increases the difficulty of making the crimping hole.In this paper,taking the manufacture of a PCB crimping hole as an example,the influencing factors of crimping hole are analyzed from the aspects of drilling bit selection,electroplating uniformity,electroplating throwing power under different plating equipment and electroplating current modes,surface treatment thickness and so on.The research and analysis results show that for the PCB products with the surface treatment such as electroless nickel gold,organic solderability protectant,electroless silver immersion,electroless tin immersion,etc.,the main factor that affects the aperture change of the crimping hole is the electroplating throwing power under different plating equipment and electroplating current modes.
crimping holethrowing poweraperture compensationaspect ratio
万方数据
维普
