In the present paper, a three-step procedure is proposed to design micro-/nano-textures for the surface decoration of products, to apply tailored textures onto the surface of nitrided punch for micro-embossing and for micro-piercing, respectively, and to imprint them onto product surfaces. In addition to this direct printing of nano-structured patterns by stamping, there are many ways to imprint tailored nano-textures onto selective surface areas during metal forming. As surveyed in, this nano-texturing process is useful to fabricate nano-textured punches and dies for the transcription of the surface nanostructure onto metal, polymer, and oxide-glass products by fine stamping. Hence, the femtosecond laser nano-texturing becomes a key technology to modify and control the physical and chemical properties of various material surfaces in practice.
In addition to this surface property control, optical properties were also tuned by femtosecond laser irradiation. Through micro-/nano-texturing by femtosecond laser processing, the original hydrophilic surfaces of AISI304 substrates were controlled to be super-hydrophobic for example, the static contact angle increased to 170.4°, nearly equal to the ideal angle by theoretical estimate. Among its several features, LIPSS (laser-induced periodic surface structuring) has attracted many researchers since its initial discovery. In the latter, a mother punch works as a tailored tool to transform a perfect shearing process design onto highly qualified product surfaces with use of the nano-texturing method, as shown in Figure 1b.įemtosecond laser processing is commonly employed as tooling to perform the laser printing of micro-/nano-textures onto mother dies.
( a) Micro-/nano-patterns → Laser-printed die → Micro-/nano-textured product, and ( b) nano-patterns → Laser-machined die → Highly qualified product surface. Two data transformation procedures from the design base to the final product by imprinting mother die textures.
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