五軸NURBS補間加工用CAMシステムの開発 : 一般化ポストプロセッサによるNCデータの生成(機械要素,潤滑,工作,生産管理など)

概要

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NURBS (Non-Uniform Rational B-Spline) is well known to express free-form curves and surfaces in current CAD systems. Some NC controllers can accept NC data written in the NURBS interpolated format by using G 06.2 code, and NURBS interpolated machining enables us to decrease the amount of NC data, to eliminate the error due to the linear interpolation and so on. Although there are a few post-processors to generate NURBS interpolated NC data for simultaneous 5-axis controlled machining, most of them transform linear interpolated NC data into NURBS interpolated ones by the least square method and so on. Therefore, if the linear. interpolated NC data is huge, the conventional post-processor may require a long calculation time to generate NURBS interpolated ones. In addition, the post-processor lacks general versatility because it copes with a specific machining center. To solve these problems, the study deals with developing a generalized post-processor which can generate NC data without the linear approximation, while considering the axis composition of various machining centers. As the result, it is found that the developed post-processor efficiently generates practical 5-axis NURBS interpolated NC data.
2009-01-25