Abstract: This paper analyzes the problem of lines duplication, overlap and discontinuity in the application of AutoCAD. And it also proposes a method of automatic elimination of duplication, overlap and discontinuity by using the VisualLISP language embedded in AutoCAD system. After the processing, the engineering drawings can avoid linear problems which do not conformity to the requirements of the national standard, and can also avoid the complex work of manually modifying on the complicated lines. The processing of repetition elimination in sheet cutting diagram is possible to extend the life of the laser cutting head and the cutting accuracy of the spare part. After the computer graphics repeating the eliminate processing, it can effectively improve the recognition rate of computer graphics automatic scoring system.

Key words: AutoCAD, Line repetition eliminate processing, Engineering drawings, Laser cutting, Automatic scoring

摘要： 分析了AotoCAD中图线重复、重叠、间断在实际应用中存在的问题，提出了利用AutoCAD系统内嵌的VisualLISP语言编写自动消除重复、重叠、间断线的方法。经过程序处理的工程图样可以避免出现线性不符合国标要求的问题,避免人工修改图线的繁杂工作。对板材切割图进行消重处理，可以延长激光切割头的寿命及零件的切割精度。对计算机绘图进行消重处理，可有效地提高计算机绘图自动评分系统的识别正确率。

关键词: AutoCAD, 图线消重, 工程图样, 激光切割, 自动评分