SMT quality detection method, from the traditional manual naked eye detection to the use of magnifying glass detection, later with the help of magnifying glass detection, to now all use the latest technology products-the AOI automatic quality detector is the fastest, most convenient and most accurate, AOI use mechanical, electrical, computer software coordination. More intelligent detection, in recent years, the development of AOI optical detector technology is very fast, the use of SPC statistics system has become a need of most SMT manufacturers.

The automatic optical inspection (AOI) with statistical process control (SPC) tools can be used to form a system with on-line real-time statistical analysis to detect assembly defects. the assembly quality of printed circuit boards (PCB) can be greatly improved by the combination of clear defect images observed by the AOI system and SPC data analysis.

  Keywords: automatic optical inspection (AOI); statistical process control (SPC); printed circuit board (PCB); electronic assembly

 The rapid development of electronic technology has played a great role in promoting the human society to enter the information age. While people enjoy the convenience of work and the improvement of quality of life brought by high and new technology, the electronic industry is facing the challenge of design, manufacture, assembly and due to the miniaturization and miniaturization of electronic products.

  Printed circuit boards (printed circuit board referred to as PCB) are the basic components in electronic products. today’s PCB require the use of finely spaced, I/O spaced, compactly spaced components, enabling acceptance of the latest roll-out of ball-gate array (BGA) components, quadrilateral flat packaging (QFP) components, on-board chip (COB) components, chip size packaging (CSP) components, and flip chip (FC) devices. In the process of electronic assembly, it is very important to ensure the quality of PCB assembly. It is an important link to ensure the high reliability of the final product. Meet the important guarantee of timely delivery of products to users and enterprises to obtain a good rate of return. Because of this, the use of advanced technology to detect PCB components can eliminate the problem in the bud.

Nowadays, PCB components with high density assembly technology are becoming more and more common, and traditional PCB detection technology is facing severe challenges. PCB the increasing complexity and density of components, the development of various testing techniques is promoted to adapt to the current detection requirements of PCB components. Visual inspection and electrical testing are often used in electronic assembly industry, and visual inspection has been developed from manual visual inspection to automatic optical inspection (automatic optical inspection referred to as AOI) and automatic X ray detection.

AOI System SPC Statistical Function