In the SMT surface mount processing industry, AOI testing is essential. So what is AOI testing?
AOI detection, also known as automatic optical inspection equipment, is a new device that has only become popular in recent years. It can automatically inspect, alarm, display abnormalities, and achieve complete automation. Below, Kanglingyuan will introduce the principle and advantages of AOI detection in SMT surface mount processing.

1、 The principle of AOI detection

Principle: Using optical principles, the camera on the device scans the PCB, collects images, and compares the collected solder joint data with the qualified data in the machine database. After image processing, the PCB soldering status is marked.

2、 The advantages of AOI detection

Due to the shrinking size of some electronic products and the increasing precision of PCB circuit boards, the difficulty of manual inspection of PCB boards is increasing. The inspection speed is slower than that of machines, and prolonged inspection can easily lead to eye fatigue and missed detections. In order to improve work efficiency, AOI can demonstrate its superiority.

1. Save manpower and reduce labor costs;

2. Increase production efficiency and improve production capacity;

3. Unified testing standards, without any differences due to different lines;

4. Timely feedback and statistics on production issues;

5. Collect testing data, provide process analysis, and strengthen process capabilities;

6. Improve the rate of incoming good products.

3、 AOI detection at the position of small target SMT surface mount processing production line

1. After use with SMT surface mount machine: It can effectively prevent component loss, polarity, displacement, monument placement, reverse side, and so on.

2. Use after reflow soldering: Located at the end of the production line, the detection system can check for missing, offset, and skewed components, the correctness of solder joints and insufficient solder paste, solder shorts, and defects in all polarities.

Although AOI detection has significant advantages over manual inspection, it is not omnipotent and may have technical blind spots, leading to misjudgments. In such cases, manual re evaluation is necessary.