AOI optical inspection equipment is an important equipment to ensure the quality of SMT patch processing
Today, the editor and you are introducing the most important equipment for quality assurance in SMT patch processing-automatic optical inspection equipment (AOI). Automatic optical inspection (AOI) has become an indispensable process monitoring method in the SMT industry. In most cases, we need to use this method to find defects, and the AOI system has become an important link in the SMT process. Under normal circumstances, the AOI system is used after reflow soldering, so that defects in the circuit board manufacturing process can be found in time, and defective products are prevented from being delivered to the end user.
AOI optical inspection equipment
Defect inspection can tell the process engineer what happened at that moment. The AOI after reflow soldering can find various defects, and then, according to the number and severity of the defects, it is decided whether to scrap the printed circuit board or send it for repair. The delivery pressure will determine whether to adopt this manufacturing method. And, sometimes, a decision needs to be made before the process engineer rechecks the production defect data. If the defect occurs randomly, the process engineer may not take measures. If there is regularity, then the process engineer needs to conduct continuous observation and experiment to find out the exact cause of the defect and avoid the same problem again. Of course, the role of AOI is much more than that.
Defect prevention is a management strategy that integrates Statistical Process Control (SPC) and Six Sigma (Sigma). These two concepts have been used for many years. The purpose is to continuously improve the solder paste printing process and placement process. Every process engineer hopes to be able to do this. However, due to time and condition constraints, and pressure from internal policies, they are basically not given this chance. Defect prevention centered on AOI is a method that uses a large number of existing AOI equipment to generate inspection and measurement data. This method uses many statistical process control/six sigma rules, but it avoids users getting stuck in details, allowing them to continue real-time analysis, find out the exact cause, and perform predictive analysis.
Using AOI flexibly on the production line and taking measures to prevent defects can shorten the feedback time for the current production line status. This can solve printing and placement errors more quickly, and at the same time can reduce the final defect per million (DPMO) of the production line and keep it at a low level. A complete set of defect prevention solutions focuses on the feasibility of obtaining high-quality inspection and measurement data from the AOI system and some software applications that have undergone rigorous engineering processing. These solutions have been successful in many high-volume SMT factories around the world.
In the field of electronic manufacturing, quality is the focus of all customers. For foundries, quality is also the most important thing for survival and development in the current era. It also means that if the quality of current foundry products cannot be obtained by customers Recognition and acceptance, it is very likely to lose the next customer. Therefore, PCBA processing plants must continue to improve product quality in order to maintain the leading position in the market, ensure product quality, reduce internal costs and reduce warranty costs, which are the driving force and source of the development of complete machine manufacturers.
