Abstract: The structure of extrusion die is relatively fixed, but it has a lot of redundant waste lines in
plate engineering drawings, and the processing of dimensioning is not convenient. Taking extrusion die
as the research object, the automatic dimensioning system of engineering drawing for profile extrusion
die is developed on Unigraphics NX (UG) platform. The following aspects are studied: proposing the
method of identifying redundant line of plates to ensure automatic elimination of the lines by deletion or
transformation. Presenting the method of recognizing edges for hole positioning dimensioning and
adopting the method of four quadrant incremental arrangement to realize automatic arrangement for
positioning dimensions. Proposing the method of hole recognition and matching to achieve automatic
dimensioning of the specification, tolerance and text. The application result shows the system greatly
reduces the workload and improves the efficiency of drawing dimensioning.

Key words: extrusion dies, engineering drawing, eliminate redundant line, incremental arrangement;
automatic dimensioning