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- W4237794260 abstract "This paper develops a formulation of the nest and shear scheduling problem and applies it to an NC shearing system. The nest and shear scheduling problem is the determination of how materials should be nested and sheared to stocked row blanks required by users of the product. This problem occurs because of obvious economics associated with producing materials in blanks that include so called “a waste, a scrap or a trimloss”. The difficulties in solving the problem lie in conquering not only a large number of possible nesting patterns-so large a number that the problem becomes a combinatorial one-but also graphic processings in which locations of materials are stored and collision between the materials in the blank, which is to be avoided. As a result, a heuristic method based on a recursive approximation is developed to determine the location of materials. The numerical experiments executed by a mini-computer give a practical solution to the method proposed, that is a waste ratio (wastes area/blank area) is around 7%. For the production of an NC tape to shear materials, a shearing sequence of materials nested in blanks should be determined. An elegant solvable method is also presented. As a post-processor originating in the results above is developed for the NC shearing machine, then the NC shearing system is accomplished for computer-aided manufacturing." @default.
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- W4237794260 date "1981-01-01" @default.
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- W4237794260 doi "https://doi.org/10.2493/jjspe1933.47.523" @default.
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