On Auto-Programming for NC Machining of Aspheric Curve

Abstract

Approximate Double Circular Arc Interpolated Method (ADCAIM) has been proposed by the authors. It requires only the included angles in the normal directions of the adjacent arcs at intersection points to be less than specified value, but does not require the adjacent arcs to be tangent as in other circular arc interpolated methods. ADCAIM is an approximate method with better calculating speed because of its concise calculation, and its interpolated error can meet the requirement too. The problems in NC programming of aspheric curves have been solved by using ADCAIM. In this paper, to the plane profile including aspheric curves, using VB program language as the second development tool, auto-programming for NC machining of aspheric curve is also realized by using ADCAIM, as long as the curve’s profile graphics on the AutoCAD is known. The research result indicates: the method introduced in this paper can meet the needs of NC machining in both interpolated accuracy and calculating speed for the example.