Thermally-formed parts with superior coating adhesion and the method of manufacturing these parts

Abstract

The invention relates to a thermoformed part with superior adhesion of the coating. The thermoformed part comprises a substrate and a small coating applied to at least one side of the substrate. The average roughness Ra of the surface of the thermoformed part is between 1.0μδ and 3.0μιη, the apex height and the top-to-bottom height Rt are between 8 µm and 30 µm, and the number of rough peaks Rpc is greater than or equal to 50. The invention also relates to a method for producing thermally formed parts with superior coating adhesion including the following steps: (1) soaking the substrate in an aluminum coating solution to obtain a plate with an aluminum coating on its surface; (2) performing flattening; (3) performing stamping on this plate or cutting this plate to obtain a plate with the shape of the required part; (4) performing heat treatment; and (5) perform heat transfer into mold and hot stamping, in which the heated workpiece is transferred to the mold for cooling and hot stamping to create the part formed by heat.