工具の損耗を考慮した最適工具交換時期の設定

概要

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This paper describes determination procedure of optimum tool changing period which minimizes the loss of tool cost due to early tool changing and the loss of defectives, or non-conforming articles, produced by delayed tool changing, together with machining and material costs. For stochastic approach, a tool-life model is built-up by adding to a progressive wear process according to Taylor-like equation a sudden-death mechanism corresponding to macro-scopic fracture. The model is developed as a fuction described by log-normal distribution and exponential distribution. Moreover, the distribution of defectives produced by the tool failed under fracture or wear can be obtained in similar way. Effects of several factors connected with machining economics on optimum solution are then investigated. The factors are failure rate, work material cost, cutting length, overhead and labor cost, and tool cost. The optimum tool changing periods given under various conditions are compared with the solutions given by deterministic approach. In many iuustrations, the optimum tool changing periods come to shorter than those by deterministic approach except the case of high tool cost.
公益社団法人精密工学会の論文
1985-06-05