Akademik Veri Yönetim Sistemi
23rd World Hydrogen Energy Conference (WHEC 2022), İstanbul, Türkiye, 26 - 30 Haziran 2022, ss.1
Micro-stamping is a convenient
sheet-metal forming technology providing small tolerances, surface accuracy,
low-cost and fast production of thin metallic sheets. Compared to macro-forming
operations, tribological changes in micro-forming processes are harshened. Tribological
size effect should be considered for a better understanding of surface
interaction on micro-scale. The objective of this study is to establish
numerical and experimental models for micro-stamping of stainless steel blanks
regarding the tribological size effect and determine the effects of feature
size of the dies and stamping force onto friction, von-Mises stress, plastic
strain, part thickness changes. Numerical models of micro-stamping process for
the dies with 3 distinct channel sizes (250 µm, 750 µm and 2500 µm) were
established in FEA package Ls-Dyna. Several coefficients of friction values
were imposed and runs were performed. Micro-stamping were also conducted to
verify the established FE models. It was noted that the dies with different
channel sizes showed different magnitudes and distributions of von-Mises stress
and plastic strain. In addition, different friction coefficients were
encountered for the micro-stamping dies with 250 µm, 750 µm and 2500 µm channel
sizes. The lower channel size the higher coefficient of friction was observed
as a result of tribological size effect.