What is the difference between SPI solder paste inspection machine and AOI automatic optical inspect

Source:我的网站      Tiem:2020-12-07 17:42:25

The Chinese name of SPI is solder paste thickness tester, which can be used to check the thickness, volume, and area of solder paste in solder paste printing, so as to control the quality of solder paste printing. Generally can be divided into 2D and 3D detection. As the first process of SMT, solder paste is used, and the quality of solder paste plays a key role in the product. According to statistics, 72% of defects in electronic products are caused by solder paste. It can be seen that its importance is called product The success or failure factor cannot be overstated.

The positioning of the SPI solder paste detector equipment is a quality control and analysis tool. Although it detects the height, volume, area, short circuit and offset of the solder paste, its detection data is more important. The SPI equipment provides quality control personnel with analysis data of the inspection content, so that the changing trend and law of the inspection content such as the height and volume of the solder paste can be obtained from the data, so that the equipment can be adjusted before printing to reduce the defect rate.

The full name of AOI is automatic optical detector. It is a new type of testing technology that has emerged, but it has developed rapidly. Many manufacturers have introduced AOI testing equipment. During automatic inspection, 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.

The AOI detector equipment not only detects large amount, small amount, presence, offset, open circuit, tin connection, pollution, etc., but also detects component defects, solder joint defects, etc., on the solder paste on the printed components. Said, AOI equipment is an indispensable testing equipment for a standard SMT production line. In addition to the difference between the inspection content and focus points, the SPI equipment is a three-dimensional inspection equipment, while the AOI equipment is a two-dimensional plane inspection. It cannot detect the height of the component or solder paste, and it does not apply to the solder paste. Area, volume, etc. are tested, so there is an essential difference between AOI detector equipment and SPI solder paste detector equipment.



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