Method of manufacturing a sandwich panel which is locally stiffened, and panel produced thereby

The invention relates to a method for producing a rigidified insert zone for receiving a fastening system inside a composite panel (100) of the sandwich type with a cellular core (102). According to the invention, a reinforcing plate (200) is positioned at a predetermined location on the internal face of a portion of a forming mold, said plate being provided with pins (201), and placed in the forming mold. the honeycomb core sandwich material (102), said material is pressed by closing the forming mold, to form said panel (100), so that the panel matches the shape of the reinforcing plate (200) which is anchored by through its pins (201) in the latter.