The full Chinese name of AOI (Automated Optical Inspection) is automatic optical inspection, which is based on optical principles to detect common defects encountered in welding production. AOI is a new type of testing technology that is emerging, but it is developing rapidly, and many manufacturers have introduced AOI testing equipment. During automatic detection, the machine automatically scans the PCB through the camera, collects images, compares the tested solder joints with the qualified parameters in the database, after image processing, checks out the defects on the PCB, and displays/marks the defects through the display or automatic signs Come out for repair by maintenance personnel.
Use high-speed and high-precision visual processing technology to automatically detect various mounting errors and soldering defects on PCB boards. PCB boards can range from fine-pitch high-density boards to low-density large-size boards, and can provide online inspection solutions to improve production efficiency and welding quality. By using AOI as a tool to reduce defects, errors can be found and eliminated in the early stages of the assembly process to achieve good process control. Early detection of defects will avoid sending bad boards to the subsequent assembly stage. AOI will reduce repair costs and avoid scrapping unrepairable circuit boards.
Implementation goals
Final quality: monitor the final state of the product when it leaves the production line. When the production problem is very clear, the product mix is high, quantity and speed are key factors, this goal is preferred. AOI is usually placed at the end of the production line. In this position, the equipment can generate a wide range of process control information.
Process tracking: use inspection equipment to monitor the production process. Typically includes detailed defect classification and component placement offset information. When product reliability is important, low-mix high-volume manufacturing, and stable component supply, manufacturers prioritize this goal. This often requires the inspection equipment to be placed in several locations on the production line, to monitor the specific production status online, and to provide the necessary basis for the adjustment of the production process.
