CONTROL METHOD FOR CUTTER FEEDING SPEED IN NC MACHINING

摘要

PURPOSE:To control a cutter feeding speed with a corner part being recognized surely and correctly, by directly recognizing the corner part from the shape model of the body to be worked, including the apex of the corner part in a cutter locus point row and also adding a recognition code to this corner apex. CONSTITUTION:A shape polyhedron 2 is generated with a shape model 1 being approximated to a lot of microplanes. The angle theta among each microplanes is calculated, and it is recognized as a corner part 3, in the case of each angle thetabeing larger than the reference angle. And, a corner part recognizing code is added to a pair of microplanes 4 which makes the angle theta. Then, the shape polyhedron 2 is offset by the radius part of a cutter to generate an offset polyhedron 5, and the corner part recognition code is added even to a pair of offset faces 6 corresponding to a pair of microplanes 4 located on this offset polyhedron 5. Then, the sectional shape that the offset polyhedron 5 is cut by the specified plane is generated as a cutter locus 7 composed of a CL point row. At this time, a corner part apex 8 in included in the CL point row. Also, the recognition code is added to the corner part apex 8.