遊星バレル槽内における二粒子群の挙動解析（遠心力による粒子の流動と偏析）

摘要

Barrel polishing is an extremely efficient processing method for surface smoothing treatment of a large number of workpieces. However, workpieces and grinding materials may separate depending on the processing conditions. Therefore, examination of the processing conditions using dynamic analysis of the behaviors of workpieces and grinding materials is strongly desired. In this study, the behavior of the particles in the planetary barrel that simultaneously rotates around a horizontal axis and revolves around a vertical axis was examined through experiments and simulations using the discrete element method (DEM). The center of the rotary barrel was set up so that the centrifugal force might act on the particles in this barrel. As a result, it was demonstrated that the distribution of two kinds of particles might be replaced by setting position of the center of the rotary barrel even if in same combination of particles.%バレル研磨法は，工作物の表面平滑処理を大量に且つ効率的に行う方法として知られている．しかしこの方法は，加工条件によっては工作物と砥材とが分離してしまう場合がある．遠心バレル研磨機の一種で，水平軸回りの自転と垂直軸回りの公転を同時に行う遊星回転のバレル研磨機においてもこの分離現象は生ずる．バレル加工は，容器内で工作物と砥材等を混ぜ合わせながら加工するものであるから，この分離が生じることは甚だ具合が悪いものである．