Generation of Tool Paths for Machining Free-Form Pockets with Islands Using Distance Maps |
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Authors: | J Jeong K Kim |
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Affiliation: | (1) Department of Industrial Engineering, Pohang University of Science and Technology, Pohang, South Korea, KR |
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Abstract: | In this paper, we present a new procedure for generating tool paths using discrete distance maps, especially for dealing with
free-form shaped pockets with multiple islands. In this procedure, a discrete distance map is computed by shading a right
circular cone having the height of a given offset distance, while moving its apex along the boundary curve segments. Using
the discrete distance maps, the proposed algorithm effectively extracts the characteristic points or the valid self-intersection
points of offset curve segments. For an offset distance, one or more offset profiles are constructed without the topological
problems by offsetting the boundary curve segments within the parameter values specified by these chararteristic points, and
connecting them into closed profiles using the topological information contained in the distance map. The gouging-free tool
path is constructed by connecting these offset profiles, starting from the innermost offset profile. In the proposed method,
we do not need any artificial bridges for a pocket with multiple islands to merge the pocket profile and the island profiles
into a single boundary profile. |
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Keywords: | ,Distance maps, Islands, Pockets, Tool paths |
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