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The paper discusses an engineering problem i.e. the machining of multiple holes in large-sized objects on a multi-spindle CNC machine tool (drilling machine). Regarding the very long time for development of such an object (a dozen to several dozens of hours) there is a need to optimize such technological operations. The optimization comes down to choosing the holes to be made in such a way as to make the most of all available spindles in the machine tool. This will mean the shortest possible time for all holes to be made. It is therefore a discreet optimization problem. The paper introduces the spindle use indicator (degree) SWWR and proposes a discrete function of a purpose, which represents the difference between the number of holes made by all LO spindles despite the last one, and the so called R Remainder, namely the number of holes made by the last spindle. For this function of the target we search for a natural number n, for which it takes a minimum value. This natural number allows to calculate the number of holes made by each spindle LOopt, except for the last one, and this is the optimal solution. The paper presents numerical examples of such optimization. |
