CNC machine tool surface interpolator for ball-end milling of free-form surfaces

This paper presents a new type of CNC machine tool interpolator that is capable of generating the cutter path for ball-end milling of a free-form surface. The surface interpolator comprises on-line algorithms for cutter-contact (CC) path scheduling, CC path interpolation, and tool offsetting. The interpolator algorithms for iso-parametric, iso-scallop and iso-planar machining methods are developed, respectively. The proposed surface interpolator method gains the advantages for minimizing the data loaded to the CNC machine tool and maintaining the desired feedrate and position accuracy along the CC path.

[1]  Desmond J. Walton,et al.  Curve fitting with arc splines for NC toolpath generation , 1994, Comput. Aided Des..

[2]  Jun Ni,et al.  Real-time CNC tool path generation for machining IGES surfaces , 1993 .

[3]  Chih-Ching Lo,et al.  Feedback Interpolators for CNC Machine Tools , 1997 .

[4]  Yoram Koren,et al.  Efficient Tool-Path Planning for Machining Free-Form Surfaces , 1996 .

[5]  Dimitris Kiritsis,et al.  High precision interpolation algorithm for 3D parametric curve generation , 1994, Comput. Aided Des..

[6]  C. N. Chu,et al.  Effect of cutter mark on surface roughness and scallop height in sculptured surface machining , 1994, Comput. Aided Des..

[7]  Daniel C. H. Yang,et al.  Parametric interpolator versus linear interpolator for precision CNC machining , 1994, Comput. Aided Des..

[8]  Gregory C Loney,et al.  NC machining of free form surfaces , 1987 .

[9]  I. Faux,et al.  Computational Geometry for Design and Manufacture , 1979 .

[10]  Lo Chih-Ching,et al.  A new approach to CNC tool path generation , 1998 .

[11]  Yoram Koren,et al.  Computer control of manufacturing systems , 1983 .

[12]  J. Douglas Faires,et al.  Numerical Analysis , 1981 .

[13]  James E. Bobrow,et al.  NC machine tool path generation from CSG part representations , 1985 .

[14]  Moshe Shpitalni,et al.  Realtime curve interpolators , 1994, Comput. Aided Des..

[15]  P. Broomhead,et al.  Generating NC data at the machine tool for the manufacture of free-form surfaces , 1986 .

[16]  M. C. Shaw Metal Cutting Principles , 1960 .

[17]  T. Uehara,et al.  Self-intersection of an offset surface , 1990, Comput. Aided Des..

[18]  Jui-Jen Chou,et al.  Command Generation for Three-Axis CNC Machining , 1991 .

[19]  Krishnan Suresh,et al.  Constant Scallop-height Machining of Free-form Surfaces , 1994 .