| 摘要 |
<p>A method of preparing a program for machining holes, which makes it possible to reduce the number of times of exchanging the tools, comprising the steps of: (a) preparing PERT programs (P1 to P3) in which records covering tools (A to K) to be used are arranged in the order of machining steps for each of the holes having different shapes; (b) finding a tool (''C'') that is commonly and most frequently used in PERT program (P1 to P3); (c) dividing the PERT programs that include the common tool (''C'') as a tool to be used into PERT program portions (Pi1, i = 1, 2...) that precede the common tool and PERT program portions (Pi2, i = 1, 2...) that succeed the common tool, and further making the order of selecting the tools to be a group of tools to be used in the preceding PERT program portions$(1,4)$common tool (''C'')$(1,4)$a group of tools to be used in the succeeding PERT program portions; (d) repeating the second and third steps (steps (b) and (c)) until there is no more common tool used in the preceeding PERT program portions (Pi1) and the succeeding PERT program portions (Pi2), in order to determine the order of selecting the tools (A$(1,4)$B$(1,4)$F$(1,4)$H$(1,4)$I$(1,4)$C$(1,4)$D$(1,4)$G$(1,4)$E$(1,4)$J$(1,4)$K$(1,4)$); and (e) preparing, as the fifth step, a synthetic PERT program in which the records are arranged in the order of selecting the tools.</p> |
