The initial microdot and microline patterns were first ink-jet printed onto the surface of polished AISI420 stainless steel mold. This masked mold substrate was nitrided at 693 K for 7.2 ks at 70 Pa by using the high-density plasma nitriding system. The unmasked parts were selectively nitrided to have higher hardness than 1200 HV. This hardness-profiled substrate was mechanically sand-blasted to fabricate the microtextured mold. Microdisk patterned plastic cover-case for cellular phones were injection-molded by using this method for practical demonstration. Both the selective hardening and anisotropic inner nitriding processes were experimentally discussed as a key step in the present processing.
Microtexturing Into AISI-SUS420 Molds for Injection Molding Via Plasma Nitriding
Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MICRO- AND NANO-MANUFACTURING. Manuscript received September 20, 2015; final manuscript received January 30, 2017; published online March 23, 2017. Editor: Jian Cao.
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Aizawa, T., Suga, H., Nagata, T., and Yamaguchi, T. (March 23, 2017). "Microtexturing Into AISI-SUS420 Molds for Injection Molding Via Plasma Nitriding." ASME. J. Micro Nano-Manuf. June 2017; 5(2): 021004. https://doi.org/10.1115/1.4035953
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