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The visual inspection station has fast measurement speed and high precision. It can realize on-line real-time monitoring of the machining process of the body assembly and sub-assembly, so as to reflect the status of the production line in a timely and effective manner, and timely adjust the production equipment to reduce the occurrence of waste products and ultimately improve. product quality.
Welding is one of the important processes in the automotive manufacturing process and has high technical requirements. Therefore, the welding quality must be well tested. The traditional detection method usually uses a three-coordinate measuring machine, but this method is complicated in operation, slow in speed, long in cycle, and can only perform sampling inspection on the workpiece. As a new type of detection method, visual inspection has the advantages of large-scale, non-contact, intuitive, fast, high precision, etc. It can be applied to the online detection of automobile body and timely feedback the error information of the product, which not only improves the qualification rate of the product, At the same time, it also provides closed-loop feedback size control means for process improvement and error reduction, which meets the quality engineering requirements of modern manufacturing. A general vision inspection system block diagram in which a visual probe is a variety of types of vision sensors.
Laser vision inspection system
The key dimensions of the body are mainly the size of the windshield window, the edge position of the door installation, the position of the positioning hole and the positional relationship of each sub-assembly. Therefore, the visual sensors are mainly distributed near these positions, and the corresponding edges and holes are measured. The spatial position and size of the surface, etc., are generally fixed measurement systems. A measuring station is designed on the production line, and the positioned body is placed in a frame. The frame is composed of vertical and horizontal metal columns and rods, and the visual sensor can be flexibly mounted on the frame as needed. The number of sensors is usually determined by the number of points to be measured, and depending on the form of the points to be measured, the sensors are usually divided into binocular stereo vision sensors, contour sensors and the like.
1, working principle
In practical applications, it is common to form multiple visual sensors into one visual inspection station. Each sensor first calculates the coordinates of the measured point in the current sensor coordinate system, and then converges all the visual sensor coordinate systems in the system coordinate system. To complete the measurement. The work of the system is mainly based on the camera model and the three-dimensional measurement model of the stereo vision sensor.
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