Application of AOI technology in SMT manufacturing.

Automatic optical detection is an advanced quality inspection technology, and AOI realizes the comprehensive detection of circuit board components, welding, and mounting in SMT PCB manufacturing. It uses a camera and a light source to capture and analyze images on the PCB in real-time, and then compare them to standard or predetermined specifications to find any substandard identifying PCB components or welding quality problems.
AOI is mainly used in welding paste printing testing, component inspection, and post-welding component testing.
1. Stencil Printing
AOI is important in the first step of SMT's printing process. At this stage, the AOI system can detect and verify the correctness, uniformity, and position of the welding paste. With high-resolution image acquisition, the AOI was able to accurately identify any excessive or insufficient weld paste to ensure correct distribution on the PCB.
2. Component Placement
In the mount operation, the AOI is used to verify that the SMT device correctly places all the electronic components. It can detect the position, orientation, and polarity of the elements, ensuring that they agree with the design drawings. The AOI is also able to identify potential assembly errors, such as offset, tilt, or missing components, thus preventing these problems from causing more serious quality problems in subsequent processes.
3. Reflow Soldering
In the welding process, the AOI system detects the quality and connection of the solder joints. It can detect whether the solder joint is excessive or insufficient, and whether there are cold welding, short circuit, or open circuit problems. Through real-time image analysis, AOI can quickly identify any unqualified welding, and timely notify the operator to repair and ensure the final welding quality.
4. Post-Solder Inspection
The AOI still plays a role in the detection process after the welding. It can detect the defects in the solder joints, the correctness of the components, and possible assembly problems. The AOI system helps screen out potential quality issues, and ensure that the product meets the required specifications before moving into the next manufacturing phase.
5. Final Inspection
The AOI is used in a comprehensive final inspection during the terminal testing phase of the SMT. You can verify the component layout, solder joint connection, component correctness, and orientation of the entire PCB. The goal of terminal detection is to ensure that the entire PCB meets design specifications before final delivery, and AOI achieves this with efficient automated detection.

conclusion
In modern electronic PCB manufacturing, AOI equipment in SMT processing is the key tool to ensure product quality and reliability. By using high-precision image processing technology, it can detect and correct the position, polarity, and welding quality problems of components, improving the performance and stability of electronic products. As the technology continues to advance, AOI equipment will continue to play a key role in SMT processing, and Great PCB ensures the high-quality manufacturing of electronic products.