In SMT processing production, AOI detection is handled through image acquisition and analysis results, higher efficiency than artificial visual inspection.
Due to the relevant technology of the image analysis processing, after all, haven't reached the human level, so there are some AOI in SMT processing of misjudgment, false negative phenomenon, this is because after completion of AOI in SMT placement tests will exist several problems: 1, screen Yang, shield, shielding point detection problem.
2, not for BGA, FC invisible solder joint inversion components such as testing.
3, most of the AOI in the understanding of the virtual welding, cause false negatives shuffle.
4, character processing in a different way, polarity judgment accuracy caused by differences in the school.
5, capacitance value size and color the same and different specifications, easy to cause false negatives.
More than six, SMT tin, tin, offset, skew less standard defines different technological requirements, easy to cause misjudgment.
7, some points rate lower AOI cannot do OCR character recognition detection.
8, most AOI slower product testing, the few AOUI faster scanning methods, but wrongly sentenced to pan rate is higher.
9, most of the AOI programming complex, cumbersome and adjust the time is long, not suitable for scientific research units, small OEM factory, small batch production unit of many specifications.
Patch to solve above problems found in PCB PCB, SMT processing plants in addition to increasing product checking personnel also need to form a complete set of auxiliary equipment, AOI not only online AOI, also have off-line AOI equipment, thus in the quality control links, we need to very seriously.
The above in a timely manner after completion of AOI in SMT processing will exist problems in the testing, in order to improve the situation, not due to increasing product checking personnel also auxiliary equipment (
Include AOI online and off-line AOI equipment)
Hold good quality control links, to ensure the quality of the products.
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