| 摘要 |
The method checks whether a punching tool interferes with a closed line to be processed. Conventionally, line segments of the closed line is arranged in a CAD system in the order of drawing sequence. In this method, however, the line segments are arranged in the line extending order. Specifically, prepared is an interference line retrieval file in which data on line segments constituting the closed line are arranged in the order the line segments continue. Then, based on the data in the interference line retrieval file, it is checked whether or not a tool positioned on an arbitrary line segment interferes with other line segments which extend from the arbitrary line segment in a predetermined range in both forward and reverse directions the closed line extends. The line segments that extend within a predetermined range before and behind the subject line segment can be quickly identified with an easy and simple calculation since the line segments are arranged in the line extending order.
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