Research on Smooth Compression Interpolation Algorithm in CNC Machining

In order to implement high speed and high surface quality machining of free-form surface,the smooth compression interpolation algorithm is proposed.Based on the angles and lengths evaluated from the adjacent command points,the machining path of free-form can be divided into two region types.For those regions composed of discontinuous micro-line blocks,the line interpolation is performed between the adjacent command points.For those regions composed of continuous micro-line blocks,firstly the shape-defining point is selected by the bend direction of the machining path;secondly the shape-defining points are fitted into smooth spline curve to compress blocks and smooth contours;lastly the curve interpolation is performed on the fitted smooth spline curve.The experimental results show that the proposed algorithm can improve machining efficiency and surface quality.