Advantages of AOI Detection in surface mount Machining
AOI optICal automatic detection equipment forms images through optical methods, then processes the images, and then judges various defects of PCB In theory, it can judge various defects that can be seen by any human eye, such as deviation and less Tin, short circuit, pollution, missing parts, distortion, tombstone, side standing, flipping parts, wrong parts, damage, noble, extreme, false welding, empty welding, glue overflow, tin holes, unsold pins, etc
In short, the function of AOI is to perform visual inspection, mainly to check the defects on the circuit board. The light source is matched with the CAMera to take photos. The light source processes the captured image and uses the computer to detect defects.
Generally, AOI can be used in the following three locations: SMT production line,
pcb board

Solder Paste Inspection after printing, furnace front inspection and furnace rear inspection for missing parts, problem offset, short circuit, empty soldering, wrong answer part, extremely reversed white, side standing, etc
In the SMT chip processing industry, AOI inspection is essential, so what is AOI inspection?
1. AOI detection principle
Principle: use the camera on the equipment with optical principle to scan PCB, collect images, compare the collected solder joint data with the qualified data in the machine database, and MARK PCB welding status after image processing
Second, the advantages of AOI testing
As some electronic products become SMAller and smaller, PCB boards become more and more complex, and it is more and more difficult to check PCB boards manually. The check speed is slower than the machine. Long term inspection is also easy to lead to eye fatigue and missed inspection. In order to improve work efficiency, AOI can reflect its advantages.
2： The advantages of AOI are as follows:
1. Save manpower and reduce labor cost;
2. Improve production efficiency and increase production capacity;
3. The test standard is unified, and there is no difference between different line types;
4. Feed back and count production problems in time;
5. Collect test data, provide process analysis, and strengthen process capability;
6. Improve the warehousing rate of good products.
Third, the position of AOI detection in the SMT chip processing production line
1. After use of the placement machine: it can effectively prevent the loss, polarity, displacement, tombstone, inversion, etc. of components.
2. Use after reflow soldering: Located at the end of the SMT production line, the inspection system can check missing, offset, and inclined components, the correctness of solder joints and the lack of solder paste, solder short circuit, pin lifting and all polarity defects
Although AOI detection has great advantages over manual detection, AOI detection is not omnipotent, and there will be blind spots in science and technology, leading to miscalculation. At this time, manual judgment is required. In order to ensure the quality of products, we have developed 9 original inspection procedures, which have been inspected at every stage from the expected stage to the delivery stage, and made every effort to eliminate defective products in the bud.