| 摘要 |
PURPOSE:To obtain an injection molding machine for an optical disk board for manufacturing the board to hold a high rotating accuracy at the time of rotating the board without burr. CONSTITUTION:A cut in 9 of molds for forming the central hole of an optical disk board protrudes in a range represented by following formula toward a cavity 8 side. 0.01T<=T<=0.5T. In the formula, t is the protruding length (mm) of the pin, and T is the thickness (mm) of the board at the central hole. |
