Patent ID: 8185361

Claim:
An unmoldable portion detection system comprising: a processor; a memory; a normal line arithmetic unit that calculates a normal line extending from a point on each of surfaces constituting a three-dimensional shape of a molded product to outside of the molded product; a backward component determination unit that determines whether or not an extending direction of the normal line has a backward component, which is a directional component opposite to a prescribed mold pull direction of a mold of the molded product, in accordance with a surface, on which the normal line is calculated; and an unmoldable portion determination unit that determines a surface having a point, at which the extending direction of the normal line having the backward component is calculated, as an unmoldable portion to be unmoldable only by movement of the mold in one direction, wherein the system further comprises: a concave connection determination unit that, in a case where the surface which is determined as the unmoldable portion is an unmoldable surface, and a surface which is adjacent to the unmoldable surface and determined as not the unmoldable surface is an adjacent surface, determines whether or not the unmoldable surface and the adjacent surface are concavely connected to each other with respect to a boundary between the unmoldable surface and the adjacent surface; and an adjacent unmoldable portion determination unit that, in a case where it is determined that the unmoldable surface and the adjacent surface are concavely connected to each other, determines the adjacent surface as the unmoldable portion.