Analysis And Realizes Cubic B Spline Curve Interpolation Based On The Movement Control Card

The interpolation algorithm's research is the numerical control processing core, the interpolation algorithm choice immediate influence to the numerical control system's working accuracy and the speed. Along with the movement control card technology's unceasing development, uses take the movement control card as the core part's open style numerical control system is the numerical control interpolation technology development direction. Cubic B spline curve can describe each kind of complex curve, the surface precisely, became the current curve interpolation the mainstream, this article has conducted the corresponding fundamental research and the experimental verification to cubic B spline curve direct interpolation algorithm.In cubic spline curve interpolation's fundamental research foundation, discussed equal parameter interpolation algorithms in detail and equal chord length interpolation algorithm concrete processes, has given equal parameters and equal chord length two algorithm flow charts and has compiled the VC code procedure. Has carried on the confirmation firmly through the GUGAO two-dimensional numerical control movement platform to the interpolation algorithm, finally had proven the interpolation algorithm principle's accuracy, simultaneously may also see when based on movement control card, and equal chord length interpolation algorithm computation speeds are quicker, the interpolation feed rate is stable, even more is suitable for the actual processing.Interpolation curve which and theoretical curve computed result comparison obtains through the equal chord length interpolation algorithm, obtained chord length interpolation outline error E and the feed rate F equal cubic parameter spline curve function relationship, outline error E and between the radius of curvature R function relationship, provides the theory reference for the actual numerical control processing.