Abstract: A flange of a panel is inserted into an extrusion port of an extrusion molding die through an insertion slit, which opens laterally of the extrusion port, to thereby form a molding space that corresponds to a trim member between the extrusion port and the flange. A material for forming the trim member is extruded forwardly of the extrusion port through the molding space. The die and the flange are moved relative to each other while adjusting the insertion depth of the flange into the extrusion port so that the distance between a reference on the panel and the trim member is maintained at a desired distance. Thus, a trim member is extrusion molded on the edge of the flange of the panel and is mounted thereon simultaneously, thereby accurately mounting the trim member on the in a desired outer shape.

Abstract: A flange of a panel is inserted into an extrusion port of an extrusion molding die through an insertion slit which opens laterally of the extrusion port to thereby form between the extrusion port and the flange a molding space which corresponds to a trim member. A material for a trim member is extruded forwardly of the extrusion port through the molding space, and the die and the flange are moved relatively to each other while adjusting the amount of insertion of the flange into the extrusion port so that a distance between a reference position on the panel and the trim member is maintained at a constant distance. Thus, a trim member is extrusion molded on the edge of the flange of the panel and is mounted thereon simultaneously and yet accurately in a desired outer shape.