Proceedings of the
World Congress on Micro and Nano Manufacturing (WCMNM 2022 )
19–22 September 2022, Lueven, Belgium
doi:10.3850/978-981-18-5180-3_RP46-0002
Effect of Punch Surface Texture on Micro-Extrudability of AA6063 Micro Backward Extrusion
1Department of Mechanical Engineering, Toyama University, Toyama, Japan
2Department of Mechanical Engineering, Northwestern University, Evanston, Illinois, USA
3High Strength Material Group, National Institute for Materials Science, Japan
ABSTRACT
The micro-extrusion process is expected to be used in the manufacture of electronic and medical devices. The application of conventional forming processes to the microscale requires consideration of material properties and the effects of friction effects. In this research, the effects of tool surface properties such as punch surface texture on micro-extrudability such as extrusion force, product shape, and product Vickers hardness were investigated using AA6063 billets as test pieces. Millimeter-, micro-, and nano-scale textures were fabricated on the punch surface. The extrusion force increased rapidly as the stroke progressed for all punch grooves. Comparing the product shapes, the smaller the texture size, the less adhesion and the longer the backward extrusion length. The results of material analysis using EBSD show that the use of a nanoscale textured punch improves material flowability and allows more strain to enter the punch uniformly. In contrast, the use of mirror tools results in reduced material flowability and non-uniform strain. Therefore, by changing the surface properties of the punch, the tribology between the tool and the material is controlled and formability is improved.
Keywords: Micro Extrusion, Size Effect, Micro and Nano Texture, Grain Size, Aluminium Alloy.
1Department of Mechanical Engineering, Toyama University, Toyama, Japan
2Department of Mechanical Engineering, Northwestern University, Evanston, Illinois, USA
3High Strength Material Group, National Institute for Materials Science, Japan
ABSTRACT
The micro-extrusion process is expected to be used in the manufacture of electronic and medical devices. The application of conventional forming processes to the microscale requires consideration of material properties and the effects of friction effects. In this research, the effects of tool surface properties such as punch surface texture on micro-extrudability such as extrusion force, product shape, and product Vickers hardness were investigated using AA6063 billets as test pieces. Millimeter-, micro-, and nano-scale textures were fabricated on the punch surface. The extrusion force increased rapidly as the stroke progressed for all punch grooves. Comparing the product shapes, the smaller the texture size, the less adhesion and the longer the backward extrusion length. The results of material analysis using EBSD show that the use of a nanoscale textured punch improves material flowability and allows more strain to enter the punch uniformly. In contrast, the use of mirror tools results in reduced material flowability and non-uniform strain. Therefore, by changing the surface properties of the punch, the tribology between the tool and the material is controlled and formability is improved.
Keywords: Micro Extrusion, Size Effect, Micro and Nano Texture, Grain Size, Aluminium Alloy.
