Five-axis CNC machining method for eyeglass lens edge profile
To enhance the eyeglass lens manufacturing process and mitigate issues stemming from abrupt changes in tool axis vectors during lens edge processing,which could degrade surface quality,this study in-troduces a five-axis numerical control machining path strategy using UG NX(Unigraphics NX).Initially,an intelligent frame scanner captures the eyeglass frame edges,generating point cloud data of the notches.A program is then crafted to convert the spherical coordinate data from OMA files,adhering to eyeglass lens processing standards,into the required coordinates and formats.Furthermore,employing the NURBS curve fitting algorithm enables continuous tool path trajectories,ensuring curve fitting accuracy.The NC(numerical control)machine tool,fitted with a specialized conical milling cutter for lens edge pro-cessing,thus improves the precision and efficiency of lens production.In addition,a technique is devel-oped to ensure the tool axis vector changes smoothly,utilizing curve-driven tool axis motion and normal vector constraints of the lens surface for steady tool feeding.The tool path file undergoes post-processing to be converted into NC code.Upon manufacturing,lens error measurement reveals that the proposed method,focusing on curve fitting and tool axis control,significantly enhances machining surface accuracy and smoothness,reduces the manufacturing timeline,and boosts machining efficiency.
optical fabricationnumberical control systemnon-uniform rational B-splinecurve fittingtool path
万方数据
维普
