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What is the role of AOI and SPI in SMT processing?
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What is the role of AOI and SPI in SMT processing?

SMT(Surface Mount Technology) is the most popular technology and process in the electronic assembly industry. AOI stands for Automatic Organic Inspection, also known as Automatic Optical Inspection. It uses high-speed and accurate visual processing technology to detect various mismounting and welding defects on the PCB.SPI is short for Solder paste Inspection, also known as solder paste inspection. It is the solder paste quality inspection and verification and control of the printing process.

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The role of AOI and SPI in SMT processing 

1, quality control: cover some defects that can not be detected manually, including (original offset, element less tin, solder joint short circuit, component reverse, component misinstallation, component deformation, component leakage, component erection.)

2, process control: real-time generation of statistical charts, the type of failure, frequency and other information real-time feedback to the production department, so that the production department in time to find the production process problems and timely correction. As soon as possible to minimize the loss of time and materials. 

3, process parameters and other verification: for a new special processing veneer, from the printing process parameters to reflow process parameters, all need to be carefully modulated, the setting of these parameters is reasonable, ultimately depends on the quality of welding, this process must be achieved after many tests. AOI provides an effective means to verify test results.

SPI is used after the printing press for quality inspection of solder printing and verification and control of the printing process. SPI plays a significant role in the overall SMT. The AOI is divided into two types: pre-furnace and post-furnace, the former is used to detect the device mounting, and the latter is used to detect the solder joints.

The two functions are different, SPI detects solder paste printing, AOI checks the stability of cracked parts before the furnace, and inspects the welding quality after the furnace. 

What is the role of AOI and SPI in SMT processing

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