What are the requirements for checking fixture processing of plastic parts for automobile interior and exterior decoration?

The inspection tool for plastic parts of automobile interior and exterior decoration is a special inspection tool to verify whether the size, shape, position and assembly relationship of parts meet the design requirements, and its processing quality directly affects the accuracy and reliability of the inspection results. In combination with the strict requirements of the automobile industry for precision and stability, the processing of checking fixture should meet the following core requirements:

I. Consistency between design benchmark and parts benchmark

The core function of the fixture is to "reproduce the design datum", so it is necessary to ensure that the design datum is completely unified with the design datum of the parts before machining, so as to avoid the detection error caused by the misalignment of the datum.

It is necessary to directly convert the design datum (such as datum point, datum plane and datum axis) of the parts into the positioning datum (such as locating pin and supporting surface) of the fixture according to the 3D digital model (such as CATIA and UG model) and 2D drawings of the parts.

For example, if the parts are based on a certain plane, the supporting surface of the fixture must completely correspond to the plane, and the positioning accuracy should be controlled within ±0.01mm to ensure the "datum alignment" when placing the parts.