深穴加工における穴の曲がり(第1報) : アライメント誤差の影響

概要

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The deep-hole axis deviates from the setting axis in drilling operations, and this dominant problem occurs frequently. In the present paper, the influence of pilot bush, bar support and tool holder (or spindle) on the hole deviation is investigated and the mechanism of the formation of that deviation is analysed theoretically and verified experimentally. It is made clear that the machined hole tends to deviate towards the direction of the inclination of tool head in tool rotating system. It s also observed that if the pilot bush or bar support (e. g. oil seal in BTA tool) deviates from the setting axis, the bar bends, makes the tool inclined, and as a result, the machined hole runs out from the setting line. If the process goes on, the rate of deviation becomes larger. On the contrary, in workpiece rotating system, the inclination of tool head usually doesn't keep any constant direction on the co-ordinates fixed to the workpiece. So it will move nearly through the setting axis even if there is any misalignment. Therefore the magnitude of hole-deviation is smaller than that in tool rotating system.
公益社団法人精密工学会の論文
1983-10-05