Online AOI and offline AOI testing equipment

Source:我的网站      Tiem:2020-12-03 18:31:00

The full name of AOI is Automatic Optical Inspection, which is the abbreviation of Automatic Optic Inspection. It is a device that uses optical principles to detect common defects in the welding process of SMT patch processing. When the AOI inspection equipment automatically detects the PCB, the equipment automatically scans the PCB through the camera, collects PCB images, and compares the collected PCB image data with the parameters input in the database. After simple image processing, the PCB board welding defects are determined, and the automatic The marking device or equipment display will mark/display the defect so that workers can repair it in time. It can detect multiple parts, missing parts, wrong parts, tombstones, side standing, side standing, reverse sticking, replacement, extreme reverse, IC pin bending, and text recognition. It can also detect more tin, less tin, no tin, false solder, short circuit, solder ball, float, etc.


The biggest advantage of AOI automatic optical inspection equipment is that it can replace the previous manual visual inspection before and after the SMT furnace, and it can judge the shortcomings of SMT parts and assembly more accurately than the human eye. But just like the human eye, AOI can basically only perform surface inspection of the object, so as long as it is a shape that can be seen on the surface of the object, it can be checked correctly, but for hidden under the part or the edge of the part The solder joints may have limited capabilities. Of course, many AOIs can now perform multi-angle photography to increase their ability to detect IC foot warps, and increase the camera angle of some shielded components to provide more inspection Out rate.


AOI testing equipment is mainly divided into two categories: online AOI testing equipment and offline AOI testing equipment.




1. Online AOI testing equipment


Use AOI inspection equipment to monitor the PCB production process. Through the inspection of each PCB on the production line, the specific production status of the PCB is monitored online, and the basis for adjusting the production process is provided. When manufacturing low-mix high-volume products and product reliability is important, manufacturers will give priority to online AOI testing.


2. Offline AOI testing equipment


Offline AOI inspection equipment is to inspect the final state of PCB products that have gone off the production line. It is mainly used for the detection of products with clear production problems, quantity and speed as key factors, and high product mixing. Generally, offline AOI inspection equipment is set in the middle of the production line. At this position, the equipment can generate extensive process control information.


With the continuous development of PCB products towards miniaturization, the precision in the SMT placement process is required to be higher and higher. The method of detecting by human eyes has been eliminated. The introduction of AOI testing equipment can solve the waste of enterprise productivity and low product quality. , High labor costs and other issues.



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