Influence of Micro Droplets of PVD-coated Tool on Tribological Conditions in Cold Forming

8 pages•Published: August 6, 2026

Kazuhito Asai, Kazuhiko Kitamura, Sukunthakan Ngernbamrung, Takuma Ise and Chikara Matsuda

Abstract

Hard coating possibly improves die-life for the cold forming. Moreover, PVD-coated tools retain precise geometries due to lower coating temperature. However, many micro droplets scatter on the PVD-coated tool by arc ion plating. In this paper, the influence of micro droplets on tribological conditions was investigated when TiN-coated tools with the micro droplets were used for a tapered-plug penetration test. The forming load and the surface quality were estimated in the test. These were damaged by adhesion under the condition of a thin lubricant film between the tool and workpiece, while the micro droplets cannot affect both tools and workpiece under another well lubrication condition of a thick lubricant film.

Keyphrases: coating, cold forging, tribology

In: Numpon Mahayotsanun (editor). Proceedings of The 11th International Conference on Tribology in Manufacturing Processes & Advanced Surface Engineering, vol 4, pages 122-129.

Links:	https://easychair.org/publications/paper/6hcK
	https://doi.org/10.29007/xz5d

BibTeX entry

@inproceedings{ICTMP2026:Influence_Micro_Droplets_PVD,
  author    = {Kazuhito Asai and Kazuhiko Kitamura and Sukunthakan Ngernbamrung and Takuma Ise and Chikara Matsuda},
  title     = {Influence of Micro Droplets of PVD-coated Tool on Tribological Conditions in Cold Forming},
  booktitle = {Proceedings of The 11th International Conference on Tribology in Manufacturing Processes & Advanced Surface Engineering},
  editor    = {Numpon Mahayotsanun},
  series    = {EPiC Series in Technology},
  volume    = {4},
  publisher = {EasyChair},
  bibsource = {EasyChair, https://easychair.org},
  issn      = {2516-2322},
  url       = {/publications/paper/6hcK},
  doi       = {10.29007/xz5d},
  pages     = {122-129},
  year      = {2026}}

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