| 摘要 |
PURPOSE:To obtain a polished surface with no chipping and crack and almost no machining quality changed layer, by fixing a work in an electrolyte uniformly dispersing fine abrasive grains and performing compound machining by a tool of elastic conductive material. CONSTITUTION:A work 1 is fixed in an electrolyte 3 uniformly dispersing a separating fine afrasive grain 2 of alumina or the like. An objective hole 1a to be polished inserts inside a cylindrical tool 4 by an elastic conductive material of conductive rubber or the like with a diameter smaller than that of said hole 1a further with the axial line being parallel. A DC power supply 6 is connected between the work 1 and a shaft 5 with the work 1 being a plus side and the shaft 5 being a minus side. While a driving gear, connected with the shaft 5, both presses the tool 4 by polishing pressure, forming a suitable film thickness in a fluid bearing condition for an internal wall of the objective hole 1a, and rotates the tool 4 on its own axis, further rotates the tool 4 along the internal wall or the objective hole 1a to be polished. |
