source:Optimization dedicated release time:2022-04-15 Article author:yu Popular:pcb
In the production of SMT patch processing, AOI detection is the result obtained through image acquisition and analysis, which is more efficient than manual visual inspection. Since the related technology of image analysis and processing has not reached the level of the human brain after all, there will be some misjudgments and missed judgments of AOI in the SMT patch processing. This is because AOI will exist in the detection after the SMT patch is completed. some questions:
1. There are detection problems of screen sun, shield cover and shield point.
2. It is impossible to detect the invisible solder joints of flip-chip components such as BGA and FC.
3. Most AOIs have ambiguity in their understanding of virtual welding, resulting in omission of judgment and prevarication.
4. Different character processing methods lead to large differences in the accuracy of polarity judgment.
5. Different capacitance values but the same size and color can easily lead to missed judgments.
6. The process requirements of SMT chips with more tin, less tin, offset and skew are defined differently, which can easily lead to misjudgment.
7. Some AOIs with low scores cannot be used for OCR character recognition detection.
8. The detection speed of most AOI products is slow, and the few AOUIs that use the scanning method are faster, but the rate of misjudgment is higher.
9. Most AOI programming is complex, cumbersome and takes a long time to adjust, which is not suitable for scientific research units, small OEM factories, and production units of multi-specification and small batch products.
PCB circuit board patch
PCB circuit board patch
In response to the problems found above, in addition to adding quality inspection personnel, SMT processing plants also need auxiliary equipment. AOI not only has online AOI, but also offline AOI equipment. Therefore, in the quality control process, we need to pay great attention.
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