The new NURBS interpolation algorithm based on constant feed rate and deceleration in STEP-NC machining

Abstract

Interpolation technology is very important in STEP-NC machining, and affects machining accuracy and efficiency directly. Based on the analysis of major interpolation methods, is put forward an important interpolation algorithm for Non-Uniform Rational B-Spline (NURBS) curve that combines the constant feed rate interpolation for regular area of the curve and S-shaped curve deceleration interpolation for special miniature region or the cusp place. Two featured curves were initially discriminated according to the chord error. By the given interpolation, a universal NURBS curve was designed and visualized. The relevant algorithm for the curve was simulated in VC++6.0. Results have shown that the algorithm is feasible and effective. © 2012 Springer Science+Business Media B.V.