Vehicle interior board and method for manufacturing same
A vehicle interior board which is thin, lightweight, has high strength, has less degradation, peeling and the like near an end portion of a metal plate, and has high quality and excellent productivity; and a method for manufacturing the same. The vehicle interior board includes a pair of metal plates and a foamed polyurethane layer formed between the pair of metal plates. A projecting ridge projecting outwardly and extending in a predetermined direction along the outer surface is formed on an outer surface of the metal plate. Thus, it is possible to obtain desired strength and rigidity even when the metal plates or the foamed polyurethane layer are thinned or when a lightweight aluminum plate or the like is adopted as the metal plates. Therefore, it is possible to reduce weight of a vehicle interior board.
1. A method for manufacturing a vehicle interior board, comprising:
a step of molding a pair of flat metal plates respectively into predetermined planar shapes;
a step of coating main surfaces of the pair of metal plates respectively corresponding to inner surfaces of the pair of metal plates with an epoxy resin-based coating agent;
a step of forming a molding space between the pair of metal plates by sandwiching the pair of metal plates between a lower mold and an upper mold so that the main surfaces corresponding to the inner surfaces coated with the coating agent face each other;
a step of forming a foamed polyurethane layer by reacting raw materials of foamed polyurethane injected into the molding space;
a step of forming a setting surface in each of the lower mold and the upper mold for setting each of the metal plates, so that the outer surface of each of the metal plates abuts the lower mold and the upper mold, respectively; and
a step of extending a recessed groove in a predetermined direction on the setting surface of at least one of the lower mold and the upper mold,
in the step of forming the foamed polyurethane layer, at least one of the metal plates is deformed by being pressed by a pressure of the foamed polyurethane layer to form a projecting ridge projecting from the outer surface so as to have a shape corresponding to the recessed groove, wherein the foamed polyurethane layer is formed to cover peripheral end portions of each of the metal plates; and
a step of depressurizing a vacuum hole in each of the lower mold and the upper mold.
2. The method for manufacturing the vehicle interior board according to claim 1 , wherein
the setting surfaces of the lower mold and the upper mold are formed to have a planar shape larger than the shapes of each of the metal plates, and
each of the pair of metal plates is disposed near a center of one of the setting surfaces.
3. The method for manufacturing the vehicle interior board according to claim 1 , further comprising a step of attaching a skin material to the outer surface of each of the metal plates.