The production process of the connector can generally be divided into the following four stages: 1. Stamping The manufacturing process of the electronic connector generally starts from the stamping pin. Through large high-speed presses, the electronic connectors (pins) are stamped from thin metal strips. One end of the large-volume metal strip is fed into the front end of the punching machine, and the other end is wound into the take-up reel through the hydraulic working table of the punching machine, and the metal strip is pulled out by the take-up reel and rolled out to punch out the finished product. 2. After the plating of the connector pin is completed, it should be sent to the plating section. At this stage, the connector's electronic contact surface will be plated with various metal coatings. A type of problem similar to the stamping phase, such as twisting, chipping or deformation of the pins, also occurs during the process of feeding the punched pins into the plating equipment. Through the techniques described in this article, such quality defects are easily detected. However, for most machine vision system suppliers, many of the quality defects that occur during the plating process are also the "forbidden zone" of the inspection system. Electronic connector manufacturers want the inspection system to detect various inconsistencies such as small scratches and pinholes on the connector pin plating surface. Although these defects are easily identifiable for other products, such as aluminum can bottom covers or other relatively flat surfaces, visual inspection systems are difficult to obtain due to the irregular and angular surface design of most electronic connectors. It is enough to identify the images needed for these subtle defects. Since some types of pins need to be coated with multiple layers of metal, manufacturers also want the inspection system to be able to distinguish various metal coatings to verify that they are in place and in the correct proportions. This is a very difficult task for a vision system using a black and white camera, since the gray levels of the images of different metal coatings are practically similar. Although the color vision system's camera can successfully distinguish these different metal coatings, the problem of illumination difficulties still exists due to the irregular angle and reflection of the coating surface. 3. Injection molding The plastic case of the electronic connector is made in the injection molding stage. The usual process is to inject molten plastic into a metal film and then rapidly cool it. When the molten plastic is not completely filled with the film, there is a so-called "Short Shots", which is a typical defect that needs to be detected during the injection molding stage. Other defects include the filling or partial blockage of the jacks. The jack must be kept clean and unobstructed for proper insertion with the pin during final assembly. Machine vision for quality inspection after injection molding is easy to identify due to the use of the backlight. The system is relatively simple and easy. 4. The final stage of assembly of the electronic connector is the assembly of the finished product. There are two ways to insert the plated pins into the injection box: separate or combined pairs. Each time a pin is plugged in; the combined plug-in plugs multiple pins at the same time into the box. Regardless of the type of plug-in, the manufacturer requires that all pins be missing and properly positioned during the assembly phase. Another type of routine inspection task is related to the measurement of the spacing on the mating surface of the connector. As with the stamping phase, the assembly of the connector also provides an automatic detection system for the detection speed. Although most assembly line beats are one to two per second, for each connector that passes through the camera, the vision system usually needs to complete multiple different inspection items. The detection speed is once again an important system performance indicator. After assembly, the connector's external dimensions are orders of magnitude larger than the tolerances allowed by a single pin. This also poses another problem for visual inspection systems. For example, some connector housings are more than one size. With hundreds of pins in the foot, the accuracy of each pin position must be within a few thousandths of an inch. Obviously, a one foot long connector can not be detected on one image, visual The inspection system can only detect a limited number of pin quality in a small field of view at a time. There are two ways to complete the entire connector detection: using multiple cameras (to increase system cost); or when the connector is in one lens When the camera is continuously triggered before passing, the vision system "stitches" the continuously captured single-slice image to determine whether the quality of the entire connector is acceptable. The latter way The PPT visual inspection system usually uses the detection method after the connector is assembled. The "True Position" detection is another requirement of the connector assembly for the detection system. This "actual position" refers to each pin. The distance from the top to a specified design baseline. The visual inspection system must make this imaginary baseline on the detected image to measure the "actual position" of each pin apex and determine if it meets the quality criteria. The reference point delineating this baseline is often invisible on the actual connector, or sometimes on another plane and cannot be seen at the same time in the same shot. Even in some cases it has to be ground Go to the plastic on the connector box to determine the position of the baseline. There is a related topic here - detectable design. http://?itemid=351 http://news.chinawj.com .cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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