Automatic Tool Path Generation for Parametric Surfaces in Terms of Bezier Patches
AbstractThe objective aim of this paper is to develop an algorithm that generate NC tool
path for parametric surfaces based on the accuracy of a desired surface. A designed
surface is represented by sufficient control points , using these control points , the
surface has been represented depending on Bezier technique to generate reliable and
near-optimal tool path as well as cutter location data file for post-processing; the
proposed algorithm include two functions:
· Forward step function that determine the maximum distance between cutter
contact points (CC) with the given surface tolerance.
· Side step function which determine the maximum distance between two
adjacent tool paths with a given scallop height.
The output of these two functions are engaged with the generated interior data of the
desired surface and feed automatically to a vertical CNC machine (Bridge Port) through
the serial port (RS232), then one tool paths has been implemented for manufacturing one
parametric surface, with tolerance of 0.5mm, using vertical CNC milling machines
(Bridge Port) with ball nose end mill cutter ø 14mm.
The proposed algorithm has been implemented for tool path generation of several
parametric surfaces to illustrate its flexibility,
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