<技術報告>微小径ドリルによる穴あけ加工の自動化 : 適正切削条件について

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  • Automatic small hole drilling : optimum machining conditions

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This report describes the technical improvement on the small hole drilling by Numerical Control and the experimental procedure to get the optimum machining conditions such as speed of revolution and feed rate per revolution. As an experimental installation, the special NC drilling machine and the cutting forces measuring device were manufactured for trial. Through the experimental study of small hole drilling by twist drills(SKH9) of 0.2 and 0.3 mm in diameter, some quantitative optimum conditions for SS41 carbon steel, SUS304 stainless steel and C 2081 P brass were obtained from the view point of thrust and cutter tooth wear. Then the successful step feed-cycle for NC drilling was established that prevents a drill breakage by detecting the excessive thrust and then pulling the drill out.

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