| 摘要 |
In a metal mold forming method for an indoor illuminating lamp lens using a metal mold having a cavity having a form of the lens 10 to be provided with an entire surface as a designed part, the lens 10 has a prescribed thickness and a rib 10B in a back surface. The metal forming method for an indoor illuminating lamp lens includes steps of providing a gate 50 to the rib 10B and the thickness, injecting a molten resin into the cavity of a metal mold from the gate 50, separating the rib 10B from the gate 50 by inserting a cut pin 60 having a same width as a width of the gate 50 into the rib 10B and the gate 50 at a root of the gate 50 after the step of injecting is completed and taking out the lens 10 from the metal mold by moving the cut pin 60 backward after the step of separating is completed. |
