pcb切片（PCB slice）.doc

pcb切片(PCB slice)
PCB 2009-05-18 20:58:55| classification: PCB slice | Tags: | font
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Micro sectioning and hole cutting of circuit board
1. overview
The circuit board's quality, problems and solutions, process improvement, needs in the micro slice (MICROSECTIONING) as the research and judgment according to the observation, micro slice to do good, the true and correct judgments and discuss a relationship in yan. The general production line for quality monitoring (monitoring) tube multi slice made for quality assurance of the shipment or, because in a hurry and lack of experience case out, so most can only see the truth in six, only 70%, some in the lack of guidance parison of cases, or even half the truth can not see, in a vague and ambiguous image, what to see? What's the meaning of this slice? If only in order to deal with the business of course if you want to do is be nothing difficult, quality pletely identify and solve problems, it must be carefully done, grinding, polishing and other martial arts will have a tiny slice of bite to see clearly, without causing miscarriage of justice.
2. classification
The anatomical destructive sectioning of the circuit boards can be broadly divided into three categories:
(1) general slice (officially named micro section)
It can be used to make a vertical slice (Vertical Section) after filling the sealing area and the other areas of the plate surface, and it is also mon practice to do horizontal slicing (Horizontal Section) to the through hole.
(2) cutting hole
Be careful with a diamond saw blade rows of holes first central cut in half, or a row of holes with sandpaper grinding half cut half sealing glue through hole in 20x-40x stereo microscope (or entity microscope) were all half hole wall. If will hole back regrinding is very thin, then the substrate will be transparent, can be backlit (Back light) method of inspection hole copper layer to cover the situation.
(3) oblique slice (45 degree or 30