A brief analysis of the connector assembly factors

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      The final stage of electronic connector manufacturing is finished product assembly. There are two ways to connect the electroplated pins to the injection box seat: individual mating or combined mating. Individual mating means inserting one pin at a time; combined mating means connecting multiple pins with the box seat at the same time. No matter what kind of connection method is adopted, the manufacturer requires that all the pins are tested for defects and correct positioning during the assembly stage; another type of conventional inspection task is related to the measurement of the distance between the mating surfaces of the connector.

   Like the stamping stage, the connector assembly also poses a challenge to the automatic inspection system in terms of inspection speed. Although most assembly lines have one or two pieces per second, the vision system usually needs to complete a number of different inspection items for each connector passing through the camera. Therefore, the detection speed has once again become an important system performance index.

After the assembly is completed, the external dimensions of the connector are much larger than the allowable dimensional tolerance of a single pin in the order of magnitude. This also brings another problem to the visual inspection system. For example, some connector box seats are more than one foot in size and have hundreds of pins, and the detection accuracy of each pin position must be within a few thousandths of an inch. Obviously, the inspection of a one-foot-long connector cannot be completed on an image, and the visual 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 detection of the entire connector (such as metal connector): using multiple cameras (increasing system cost), or continuously triggering the camera when the connector passes in front of a lens, and the vision system “stitches” the continuously captured single-frame images. , To judge whether the quality of the entire connector is qualified. The latter method is the inspection method usually adopted by the PPT visual inspection system after the connector is assembled.

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