塑料异型材挤出模工程图自动标注系统研究

The Research of Automatic Dimensioning System for Profile Extrusion Dies

塑料异型材挤出模结构相对固定,但其板块工程图冗余废线较多,尺寸标注处理繁琐。以塑料异型材挤出模为研究对象,在UG平台上构建了塑料异型材挤出模工程图自动标注系统,并就以下方面进行了研究:提出板块冗余废线识别方法,并采用删除与转换两种方式实现各视图废线的自动消除;提出孔定位标注元素识别方法,并采用四象限递增排布法实现孔定位尺寸及其公差的自动标注;提出孔特征的识别与匹配方法,实现各板块孔特征规格、公差与文字的自动标注。通过实例分析表明该系统极大减少了图纸设计工作量,有效提高了异型材挤出模工程图的设计效率。

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.