One-stop PCBA intelligent manufacturer will tell you today what is the role of AOI in SMT chip processing? The role of AOI in SMT patch processing. Quality inspection in SMT patch factory is the key link to ensure quality. Strict implementation of quality inspection procedures can ensure that the quality of electronic processing products can meet customer needs. And AOI occupies a vital position in the production process of patch processing, and has made a great contribution to the quality assurance. Next, Shenzhen SMT chip processing manufacturers will introduce the role of AOI in SMT chip processing in detail.

The role of AOI in SMT patch processing

The full Chinese name of AOI (Automated Optical Inspection) is automatic optical inspection, which is a device based on optical principles to detect common defects encountered in welding production. AOI is a new type of testing technology emerging, but it is developing rapidly, and many manufacturers have launched 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, and after image processing, checks out the defects on the PCB, and displays/labels the defects through the display or automatic signs out for repair by the maintenance crew. Using high-speed and high-precision visual processing technology to automatically detect various placement errors and welding defects on the PCB. The range of PCB boards can range from fine-pitch high-density boards to low-density large-size boards, and online inspection solutions can be provided to improve production efficiency and soldering quality. Find and eliminate errors early in the assembly process for good process control by using AOI as a defect reduction tool. Early detection of defects will avoid sending bad boards to subsequent assembly stages, and AOI will reduce repair costs and will avoid scrapping unrepairable boards.

AOI is actually an optical identification system, which has been widely used in today's electronic processing industry, and gradually replaces the traditional manual visual inspection method. Generally, it uses image technology to compare whether there is too much difference between the object under test and the standard image. Determine whether the test object meets the standard. In the actual SMT patch factory, AOI is used to detect whether the processing quality of electronic components on the circuit board and whether the solder paste meets the processing standards, so that problems can be found in time and solved early.

And it is widely used in the inspection before and after the furnace. Before the furnace, it can confirm whether the solder paste printing and component placement meet the processing requirements, and timely correct the defective parts in the SMT process. After the furnace, AOI can detect in time Some welding defects that occur during the reflow process should be dealt with in time to avoid flowing into the next processing link. The biggest disadvantage of AOI in SMT chip processing is that some gray scales or shadows are not very obvious, and it is easier to misjudgment. These may be distinguished by using lights of different colors, but the most troublesome The most important thing is those components covered by other parts and the solder joints under the components, because the traditional AOI can only detect the places where the direct light can reach, such as the ribs of the screen frame or the components under its edge, often will be It was missed because AOI could not detect it.

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