Patent ID: 9682521
Date: 2017-06-20
CPC Classifications: B29C,B29D,B29L

Claim:
1. A metal mold forming method for an indoor illuminating lamp lens for a motor vehicle using a metal mold having a cavity having a form of the indoor illuminating lamp lens to be provided with an entire surface as a designed part, the indoor illuminating lamp lens having a prescribed thickness and a rib in a back surface thereof, the lens having a lens control surface as a back surface of the thickness, the method comprising steps of: providing a gate to the rib and the thickness; preparing a cut pin having a same width as a width of the gate; injecting a molten resin into the cavity of the metal mold from the gate; separating the rib from the gate by inserting the cut pin into the rib and through the gate at a root of the gate after the step of injecting is completed such that the cut pin forms a gate setting surface that is recessed away from the lens control surface and the gate setting surface interrupts the lens control surface; and taking out the lens from the metal mold by moving the cut pin backward after the step of separating is completed.