With the rapid development of the company, the sales volume of high-voltage inverters has increased year by year, and the importance of product quality has become increasingly prominent. Therefore, it is not enough to guarantee the stability of product quality. It is also necessary to continuously improve product quality. The printed circuit board is a relatively centralized component of the components and hooks, and it is also a component that is prone to quality problems. The control of the welding quality of the circuit board is the most important part of guaranteeing the product quality of the inverter. At present, the average monthly production of circuit boards is more than 10,000 pieces, and the number of solder joints on one circuit board must be several hundred or even thousands, and the quality of each solder joint must be guaranteed to be excellent. This is undoubtedly for solder joint inspection. It is a voluminous job. For the inspection of the quality of solder joints, the most common method used by circuit board manufacturers is to use a magnifier to observe through the eyes of a person, and check one board and one solder joint. This long-term operation will inevitably lead to eye fatigue, even due to the movement of the circuit board and the shaking of the human body, resulting in people's eyes constantly in a state of focusing and causing people to feel dizzy, nausea, and if there is visual fatigue or dizziness, nausea It is impossible to guarantee that missed inspections and misjudgements will not occur, and welding quality will be greatly reduced. In order to change this state and ensure and improve the quality of mass-produced products, the Department of Process Technology, after making a thorough market investigation, has installed a number of necessary automated production and testing equipment in the second phase of the expansion of the plant to detect solder joints. The graphic instrument is one of them.
The solder joint detector is a product that combines optical microscopy with video conversion. It consists of an optical microscope, a video image conversion module, a display screen and a two-dimensional mobile platform. The total magnification of the video microscope can be up to 147 times. When a solder joint is magnified to more than 10 times, dozens, or even hundreds of times, bad solder joints are difficult to escape from the eyes. Naturally, no missed inspection or misjudgment will occur, and there will be a great deal of welding quality. The guarantee. For example, for a component with a pitch of 0.3mm, it is difficult to see if the solder joint is qualified with an ordinary 5x magnifier, and it is difficult to find whether there is a false weld, a missed weld, a continuous weld, etc., while under the solder joint tester, As long as the magnification is 30 times, an image close to 1 cm is displayed on the screen, and the inspection personnel can find the bad solder joint easily and intuitively. For the small trachoma in the solder joint, the conventional inspection method is difficult to find, and it can be easily seen with the solder joint detection and display instrument. This not only provides a strong guarantee for the control of product quality, but also greatly reduces the labor intensity of the workers, because the detection is performed within the range of motion of the arm, a two-dimensional mobile platform and a variety of circuit boards can be used Positioning tooling, in front of a clear LCD screen, making solder joint inspection has become a quick and easy work, no longer appear to be tired of visual fatigue and dizziness, nausea, work efficiency is naturally improved.
The solder joint detection and display instrument is also equipped with a three-dimensional rotating observation mirror, which can observe the situation of the solder joint from different angles, and the three-dimensional sense is very strong. For the key parts on the circuit board, key control points, suspected bad solder joints, etc., it is possible to rotate the three-dimensional observation mirror to continuously change the angle to check the solder joints from different sides. It is more necessary to check the solder joints of some parts covered by the shield. . If you need to carefully observe a certain solder joint from the side, whether it is under a magnifying glass or under a microscope, you can't stand up and observe the circuit board. Using the solder joint detection and display instrument, you can easily carry out a 360-degree view. The check can be quickly and clearly displayed on the screen regardless of the direction in which the defect appears.
Another important feature of the solder mask detector is that it can be connected to computers and printers. Not only can the physical image be displayed on the monitor of the computer after being enlarged, but also the image can be saved and printed. In the past, after discovering poor solder joints, they were marked on the circuit board with a pen. Sometimes a circle is drawn, sometimes a small point. This practice not only contaminates the circuit board, but is also easy to repair due to unclear marking. Leakage, or due to inadvertently mark off the bad solder left to follow-up process. The solder joint detection and display instrument has a printing function connected with the computer, which can print out the position of the bad solder joint in the form of a picture, which makes up for the above defects in the previous production process, so that the bad solder joint will not remain. To the next process.
In addition, this image preservation and printing function has more important significance for product quality analysis and defect prevention. In the application, the bad solder joints can be saved in the form of pictures, and the bad solder joints can be displayed in an intuitive form monthly or even weekly. The nature of the bad solder joints, the locations and degree of occurrences, etc. are analyzed and identified. The problem of regularity, from the design, process to take measures to avoid similar problems, to eliminate the quality of the product before production, but also from the production control can propose improvement measures to eliminate the quality of the product before delivery . The former played a preventive role, while the latter played a role in elimination. This combination of prevention and elimination can ensure a steady increase in product quality and reduce the rate of defects to a minimum. Not only that, the use of excellent solder joints and defective solder joint images for the process documentation can serve as an accurate description of the language's irreplaceability, making the process guidance document more intuitive and in place, and avoiding possible deviations from the text description. In particular, in the development of welding quality standards, good, acceptable and unacceptable standards can be seen at a glance by comparing excellent solder joints with poor solder joints. The training materials used to produce pictures for production employees can receive vivid, accurate and memorable results. And all the changes are incomparable with ordinary magnifying glass in the past.
After nearly one year of application, the missed solder joint rate has declined linearly. Through subsequent soldering quality analysis, measures taken from design, process, and production have resulted in a significantly lower defect rate of solder joints than before. The welding spot detection and display device directly or indirectly improves the quality of welding, at the same time, it also improves work efficiency and productivity, and satisfies the rapid development of the company. The Ministry of Technology and Technology will continue to work hard to ensure and improve product quality, increase production efficiency, guarantee production capacity, reduce product production costs, reduce labor intensity and improve operational safety, and develop and select advanced technology and equipment. The rapid development of the company provides a strong guarantee for the company's steady development.
