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IJAT Vol.18 No.3 pp. 358-365
doi: 10.20965/ijat.2024.p0358
(2024)

Research Paper:

Milling of TiBbm2 Particle Reinforced High-Modulus Steel

Hideharu Kato*1,†, Kazuya Matsumoto*2, Yukio Ito*3, Shigehiko Sakamoto*1, and Hitoshi Sumiya*4

*1Kanazawa Institute of Technology
3-1 Yatsukaho, Hakusan, Ishikawa 924-0838, Japan

Corresponding author

*2IJTT Co., Ltd.
Tsuchiura, Japan

*3Aichi Steel Corporation
Tokai, Japan

*4Sumitomo Electric Industries, Ltd.
Itami, Japan

Received:
September 29, 2023
Accepted:
November 24, 2023
Published:
May 5, 2024
Keywords:
TiB2 particle, high-Young’s-modulus steel, binderless CBN, tool life, cutting temperature
Abstract

TiB2 particle reinforced high-stiffness steel is one of the composite materials that aim to improve Young’s modulus by compositing TiB2 particles into a stainless steel base phase. This material is designed to exhibit higher rigidity and strength than conventional iron-based materials by using TiB2 particles as the reinforcing phase, and is expected to reduce the weight of high-load components in engines. For this reason, tool life is very short when machining this material. Therefore, high Young’s modulus steel containing TiB2 particles is known to be one of the most difficult-to-cut materials. The purpose of this study was to investigate how to extend tool life in the milling of high-Young’s-modulus steel. Cutting speed dependence of tool life was investigated by end milling using a binderless CBN tool with excellent hardness and bending strength. In addition, the tool damage mechanism was also investigated. The results showed that tools composed of binderless CBN tool have a longer life than conventional CBN tool. In this type of binderless CBN tool, the tool wear rate tended to increase with increasing cutting speed. In addition, the longest tool life was obtained at a cutting speed of 1.25 m/s, though wear rate increased at a boundary cutting length of 1300 m. The wear rate was found to increase with increasing cutting speed. Temperature measurement results indicate that the primary cause of tool damage was mechanical wear, as the temperatures were much too low for a reaction between cBN and Fe. Friction tests revealed scratch marks on the tool originating from crushed cBN particles produced by the crushing of the cutting edge. This indicates that wear is accelerated by the high frictional energy of the cBN powder rubbing against the flank face.

Cite this article as:
H. Kato, K. Matsumoto, Y. Ito, S. Sakamoto, and H. Sumiya, “Milling of TiBbm2 Particle Reinforced High-Modulus Steel,” Int. J. Automation Technol., Vol.18 No.3, pp. 358-365, 2024.
Data files:
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Last updated on May. 19, 2024