新しいPt基アモルファス合金を用いたガラスレンズ成形用金型の試作(機械要素,潤滑,工作,生産管理など)

概要

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This paper reports the use of a novel Pd-based amorphous alloy as a material for a glass lens molding die with diffraction gratings. The properties required of the amorphous alloy are as follows : (a) the amorphous alloy must be able to be deposited as a film with a thickness of more than 50 μm on a blank die; (b) the alloy must not exhibit crystallization or oxidization and must not adhere to glass, when a glass molds on the die of the amorphous alloy in air ; ( c ) it must be able to ultra-precision machined (maximum surface roughness R_z of less than 30 nm) by single-point diamond turning (SPDT) ; (d) it must have a fracture strength of greater than 0.6 GPa. We employed a combinatorial search using combinatorial arc plasma deposition to search for an amorphous alloy that satisfied the above criteria. Pt-Hf-Zr-Ni amorphous alloy was selected from the results of the combinatorial search of Pt-Zr-Ni and Pt-Hf-Ni alloys. The Pt_<51>Hf_<20>Zr_<17>Ni_<12> alloy satisfied all the above criteria and it was possible to fabricate a molding die by SPDT using it. The molding die was capable of molding a glass lens with diffraction gratings.
社団法人日本機械学会の論文
2008-04-25