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research-article

Micro-Texturing into AISI-SUS420 Molds for Injection Molding via Plasma Nitriding

[+] Author and Article Information
Tatsuhiko Aizawa

Department of Materials Science and Engineering, Shibaura Institute of Technology 3-9-14 Shibaura, Minato-City, Tokyo 108-8548, Japan
taizawa@sic.shibaura-it.ac.jp

Hiroki Suga

Department of Engineering and Design, Shibaura Institute of Technology 3-9-14 Shibaura, Minato-City, Tokyo 108-8548, Japan
i032544@shibaura-it.ac.jp

Takehiro Nagata

Graduate School of Engineering, Shibaura Institute of Technology 3-9-14 Shibaura, Minato-City, Tokyo 108-8548, Japan
mb15040@shibaura-it.ac.jp

Tetsuya Yamaguchi

Division of Research and Development, Sanko-Light Industry, Co. Ltd. Ue-kotanaka 6-22-10, Nakahara-City, Kawasaki 211-0053, Japan
yamaguchi@slkco.jp

1Corresponding author.

ASME doi:10.1115/1.4035953 History: Received September 20, 2015; Revised January 30, 2017

Abstract

The initial micro-dot and micro-line 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 micro-textured mold. Micro-disc 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.

Copyright (c) 2017 by ASME
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