In the SMT chip processing industry, AOI testing is essential. So what is AOI testing?

The AOI inspection is an automatic optical detector, which is a new device that has only become popular in recent years. It can automatically patrol, automatically alarm, display abnormalities, and fully automate. The following Kang Lingyuan introduces you to the principles and advantages of AOI detection in SMT chip processing.


First, the principle of AOI detection


Principle: The optical camera is used to scan the PCB on the device, collect images, and compare the collected solder joint data with the qualified data of the machine database. After image processing, the PCB soldering status is marked.


Second, the advantages of AOI testing


As some electronic products become smaller and smaller, the PCB circuit board becomes more and more precise, the difficulty of manually checking the PCB board is increasing, and the inspection speed is slower than that of the machine. Long-term inspection is also prone to eye fatigue and leakage detection. In order to improve work efficiency, AOI can demonstrate its superiority.


1. Save manpower and reduce labor costs;


2. Increase production efficiency and increase production capacity;


3. Unified testing standards, which are not different due to different lines;


4. Timely feedback and statistical production problems;


5. Collect test data, provide process analysis, and enhance process capability;


6. Improve the rate of good storage.


Third, AOI detection in the location of the small target SMT patch processing line


1. Use after SMT placement machine: It can effectively prevent the missing, polarity, displacement, tombstone, reverse side and so on.


2. Use after reflow soldering: At the end of the production line, the inspection system can check for missing, offset and skewed components, correct solder joints and solder paste shortages, solder shorts, and foot and all polarity defects.


Although AOI detection has a very large advantage over manual inspection, AOI detection is not omnipotent, and there will be technical blind spots, which will lead to misjudgment. At this time, manual re-judgment is required.