Numerically controlled milling is the primary method for generating complex die surfaces. These complex surfaces are generated by a milling cutter which removes material as it traces out pre-specified tool paths. The accuracy of tool paths directly affects the accuracy of the manufactured surface. The geometry and spacing of the tool paths impact the scallop height and time of manufacturing respectively. In this paper we propose a new method for generating NC tool paths. This method gives the part programmer direct control over the scallop height of the manufactured surface. The method also provides options to the part programmer for generating a variety of tool paths based on practical metrics such as tool path length, tool path curvature and number of tool retractions.

1.
Altan
T.
,
Lilly
B. W.
,
Kruth
J. P.
,
Koenig
W.
,
Toenshoff
H. K.
,
Van Luttervelt
H. K.
, and
Khairy
A. B.
, “
Advanced Techniques for Die and Mold Manufacturing
,”
CIRP Annals
, Vol.
42
, No.
2
,
1993
, pp.
707
716
.
2.
Blackmore
D.
, and
Leu
M. C.
, “
Analysis of Swept Volume Via Lie Groups and Differential Equations
,”
International Journal of Robotics Research
, Vol.
11
, No.
6
,
1992
, pp.
516
537
.
3.
Bobrow
J. E.
, “
Solid Modelers Improve NC Machine Tool Path Generation Techniques
,”
Computers in Engineering
, Vol.
1
,
1985
, pp.
439
444
.
4.
Chen
Y. J.
, and
Ravani
B.
, “
Offset Surface Generation and Contouring in Computer Aided Design
,”
ASME JOURNAL OF MECHANISMS, TRANSMISSIONS, AND AUTOMATION IN DESIGN
, Vol.
109
, March
1987
, pp.
133
142
.
5.
Choi
B. K.
,
Park
J. W.
, and
Jun
C. S.
, “
Cutter-Location Data Optimization in 5-Axis Surface Machining
,”
Computer Aided Design
, Vol.
25
, No.
6
, June
1993
, pp.
377
386
.
6.
Filip
D.
,
Magedson
R.
, and
Markot
R.
, “
Surface Algorithms Using Bounds on Derivatives
,”
Computer Aided Geometric Design
, Vol.
3
,
1986
, pp.
295
311
.
7.
Huang
Y.
, and
Oliver
J. H.
, “
Non-Constant Parameter NC Tool Path Generation on Sculptured Surfaces
,”
International Journal of Advanced Manufacturing Technology
, Vol.
9
,
1994
, pp.
281
290
.
8.
Jensen, C. G., and Anderson, D. C., “Accurate Tool Placement and Orientation for Finish Surface Machining,” Concurrent Engineering, PED-Vol. 59, ASME 1992, pp. 127–145.
9.
Koren, Y., Lo, C. C., and Shpitalni, M., “CNC Interpolators: Algorithms and Analysis,” Manufacturing Science and Engineering, PED-Vol. 64, ASME 1993, pp. 83–92.
10.
Loney
G. C.
, and
Ozsoy
T. M.
, “
NC Machining of Free Form Surfaces
,”
Computer Aided Design
, Vol.
19
, No.
2
, March
1987
, pp.
85
89
.
11.
Sarma, R., and Dutta, D., “Geometry and Generation of NC Tool Paths,” Technical Report No. UM-MEAM-95-19, Department of Mechanical Engineering, The University of Michigan, 1995.
12.
Struik, D. J., Lectures on Classical Differential Geometry, Dover Publications, 1950.
13.
Suresh
K.
, and
Yang
D. C. H.
, “
Constant Scallop Height Machining of Free Form Surfaces
,”
ASME Journal of Engineering for Industry
, Vol.
116
, May
1994
, pp.
253
259
.
This content is only available via PDF.
You do not currently have access to this content.