PCBA is a substrate for assembling electronic parts. The manufacturing quality of PCBA directly affects the reliability of electronic products. With the in-depth development of electronic assembly to PCBA hybrid technology with higher density and smaller size, in order to reduce the number of defective circuit boards entering the next process, there is an increasing demand for automatic optical inspection (AOI) system for PCBA testing.
AOI system is an automatic detection system based on the application of machine vision technology. It realizes the defect detection of PCB surface graphics through the technical process of extracting PCB surface graphics through high-definition linear array camera, digital conversion of graphics, logical judgment and matching of feature points and graphics, logical comparison of line shape and contour, and judgment and extraction of defect points.
AOI system has incomparable technical advantages over other detection schemes and traditional detection methods, and has been widely used in PCBA testing. Its high-speed, high-speed and high-precision features are favored by industry users.
1. PCBA test system checks and corrects PCB defects. The cost during process monitoring is much lower than that after final test and inspection.
2. Be able to find repetitive errors as soon as possible, such as mounting displacement or incorrect tray installation.
3. The combination of the statistical analysis function of PCBA detection technology and SPC process management technology provides a powerful weapon for the timely improvement of SMT production process, and the yield of PCBA assembly has been significantly improved. With the continuous expansion of the scale of modern manufacturing industry, the control of production is becoming more and more important, and the demand for SPC data is also growing.
4. It can meet the testing requirements of PCBA assembly density. With the sharp increase of the assembly density of electronic products, some traditional testing technologies, such as ICT, can no longer meet the development requirements of SMT technology, while PCBA testing technology will not be affected by these factors.
5. The test program of PCBA testing equipment can be directly generated by CAD data. Compared with ICT, the test cost is greatly reduced because there is no need to make special fixtures.
6. It can keep up with the production beat of SMT production line. According to the test results of PCBA detection technology, it can achieve the speed of 0.1 seconds / amplitude, which can meet the requirements of online detection.
7. PCBA can always avoid the disadvantages of visual inspection and reliability, which can always avoid the disadvantages of manual inspection technology.
8. Reduce labor cost and improve product quality.
9. Non contact measurement will not damage and scratch the PCB.
10. Machine vision detection technology can complete tasks that can not be completed in the past: for example, when dealing with some micro pipe corners, the traditional method is often not competent, and PCBA detection system can realize detection.
The application of machine vision automatic optical detection system in PCBA detection industry, only the above advantages are enough to meet the requirements of PCBA detection, and realize the intelligent automation of PCBA detection.
