The inspection tool is a special inspection equipment used by automobile inspection fixture manufacturers to measure and evaluate the size and quality of parts. At the production site of the part, the on-line inspection of the part is realized by the inspection tool. Therefore, it is necessary to accurately install the part on the inspection tool, and then detect the contour and periphery of the part by visual measurement or calipers, and detect the holes of different properties in the part and the difference between the part and the part through the detection pin or visual measurement Visual inspection of the connection position. In order to ensure the rapid judgment of the quality status of the parts during the trial production and the start of production.

In this case, the deviation between the peripheral size and shape area of the inspection tool directly processed by CAD / CAM and the relative position and theoretical value of the part contour can be judged by visual inspection or measurement. For some extremely important part functions, dimensions can also be used for numerical tests. Generally, the precise coordinate value of a part based on a body coordinate system cannot be directly obtained by means of a detection tool. Only when the part is placed on a measurement tool, the precise coordinate value of the part can be obtained by a coordinate measuring machine. The structure of modern inspection tools can also be used as a measurement bracket for the design of modern inspection tools. However, when the online detection function of the detection tool and the function of the measurement support cannot be satisfied at the same time, the online detection function of the detection tool should be satisfied first.

In general, automotive checking fixture design is a set of special fixtures and test accessories designed to test product size, shape, and position characteristics. Generally speaking, automobile inspection tools can be divided into measurement brackets, simple inspection tools and complete inspection tools according to the difficulty; according to the manufacturer, they can be divided into self-made parts inspection tools and external parts inspection tools. Stamping parts / fabric carpets / glass / plastic parts inspection tools etc. As the basic plane for installation and measurement, there should be no obvious knife marks on the large floor of the inspection tool. In daily use, it can bear the weight of the inspection tool without deformation. Coordinate lines with a distance of 100 mm shall be engraved on the upper plane. The line depth is 0.5mm and the width is 0.5mm. When using a large chassis as a reference, a measurement datum should be provided on the upper plane. That is, the measurement reference plane has three measurement reference balls or three measurement reference holes or three measurement reference columns or three directions, indicating the coordinate directions and relative coordinate values of the coordinate origin and the vehicle coordinate origin.