| 摘要 |
<p>A punch-out shape (Q1) is approximated by a polygon (Q3). Lines connecting vertices of the polygon (Q3) and a machining start point (PS1), respectively, are divided by the same ratio, thus providing respective division points. The corresponding division points on the respective lines are connected to provide a plurality of polygonal closed circuits (PH2-PH4). However, at least a part of the innermost closed circuit (PH2) is made to be located outside of a machining start hole around the machining start point (PS1) as the center.</p> |
