Study on Micro Drilling — Rotating Bending Fatigue of Micro Carbide Drills

Bo Xiao Ma; Mitsuyoshi Nomura; Takahiro Kawashima; Takayuki Shibata; Yoshihiko Murakami; Masami Masuda; Osamu Horiuchi

doi:10.4028/www.scientific.net/KEM.407-408.45

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 407-408Study on Micro Drilling — Rotating Bending Fatigue...

Study on Micro Drilling — Rotating Bending Fatigue of Micro Carbide Drills

Abstract:

In micro drilling, the run-out of drill due to rotational motion error of spindle or eccentric chucking of drill causes machining error and larger radial forces which may break the drill. Furthermore, because the spindle speed is very high, rotating bending fatigue of drill may dominate the tool life. In the previous work, relationship between bending deflection and radial cutting force, and fatigue fracture of drill were investigated theoretically and experimentally. The objective of this paper is to investigate more in detail the relationship between the radial cutting force/deflection of drill and its fatigue life. A series of pseudo rotating bending fatigue tests was performed by using three types of ultrafine grain carbide drill blank with 0.1mm diameter. The main results obtained are as follows, (1) Rotating bending fatigue curve did not depend on cobalt content and tungsten carbide grain size. This differs from the results of conventional cemented carbides. (2) The fatigue fracture surface was dominantly occupied by fast fracture regions.

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Periodical:

Key Engineering Materials (Volumes 407-408)

Pages:

45-48

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.407-408.45

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Online since:

February 2009

Authors:

Bo Xiao Ma, Mitsuyoshi Nomura, Takahiro Kawashima, Takayuki Shibata, Yoshihiko Murakami, Masami Masuda, Osamu Horiuchi

Keywords:

Carbide Drill, Carbide Grain Size, Cobalt Content, Micro-Drilling, Rotating Bending Fatigue

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References

[1] H. Watanabe, H. Tsuzaki and M. Masuda: Precision Engineering, to be published.

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[2] M. Nomura, T. Kawashima, T. Shibata et al.: Proc CIRP 3rd Int Conf High Performance Cutting, Dublin, Ireland (2008) pp.539-548.

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[3] B. Ma, M. Nomura, T. Shibata et al.: Proc JSPE 2008 Spring Meeting (2008) pp.45-46.

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[4] H. Suzuki, in: Cemented Carbide and Hard Sintered Materials, Maruzen, Japan (1986) (in Japanese). Figure 5 SEM observation of fracture surface of drill blank; material A, deflection 91µm, number of revolution 12, 000.

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