深穴加工における穴の曲がり(第2報) : 工作物形状の影響

概要

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The influence of the shape of workpiece on the deviation of machined hole is studied in a variety of case of deep hole drilling. Especially, the effect of extremely unsymmetric thickness of hole wall, inclined front work-face and eccentric prebored-hole, etc, is discussed. When a workpiece with an eccentric prebored-hole is drilled, the machined hole curves toward the direction of the vector of maximum cutting force. This phenomenon is due to the fact that the hole wall deforms plastically by the pressure of the guide pad which supports a cutting force. When the drill starts to cut near the border of front work-face, the hole curves toward the thinner hole wall. This phenomenon results from the elastic deformation of the hole wall. And when drilling starts at an inclined front work-face, the hole shifts at its entry toward the direction of slope of front face. Such a deviation tends to increase with the increase of cutting depth. The theoretical value of such hole deviation are in good agreement with the experimental ones. Further, it is shown that indirect factors, e : g., tool geometry, guide bushing, cutting conditions and work material, etc., also cause the deviation of machined hole.
公益社団法人精密工学会の論文
1984-10-05