A method of manufacturing an article includes providing a molding device having a first mold and a second mold; disposing a component between the first mold and the second mold, wherein the component includes a hollow space and an opening in communication with the hollow space; engaging the opening with the first mold or the second mold; and engaging the first mold with the second mold to form a mold cavity surrounding the component, wherein the opening is engaged with a feeding port of the molding device communicable with the hollow space. The method further includes injecting a molding material into the hollow space through the feeding port and the opening, wherein the molding material includes a polymeric material and a blowing agent; and foaming the molding material to form a foamed member. The foamed member is in contact with an inner surface of the component.

An injection molding machine includes a heating cylinder provided with a gas inlet, a screw, a gas cylinder, a pressure reducing valve configured to reduce a primary pressure of a gas from the gas cylinder to a secondary pressure, a gas supply portion configured to supply the gas at the secondary pressure to the gas inlet, a secondary pressure detection device configured to detect the secondary pressure, and a controller. The controller is configured to detect an abnormality by comparing a set pressure set in advance in the injection molding machine with the secondary pressure.