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Influence of Tool Posture and Position on Stability in Milling with Parallel Kinematic Machine Tool

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Abstract

This paper investigated the machining stability influenced by tool posture and position in ball-end milling with parallel kinematic machine tool (PKM). Initially, the geometric structure was identified, and the machinery stiffness was measured by impulse respond method at several positions with four tool postures. Then, the milling tests were conducted on flat work surface using a ball-end mills. Cutting force and acceleration signals of milling tests were measured by three-axis dynamometer and accelerometer. Furthermore, these signals were analyzed by using Fast-Fourier transform and Hilbert–Huang transform (HHT). The results showed that the length of arm change with tool posture, where the machinery stiffness decreased with the total length of arms for any tool position. The experimental results also demonstrated the machining stability varied with tool posture; the trend of stability corresponds with the machinery stiffness. The vibration analysis by HHT presented the increasing of power level in the time–frequency plot when the length of arm increase during milling process. Therefore, the geometric influence must be considered to support process planning on the PKM.

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Abbreviations

a :

Depth of slot (mm)

A X :

Acceleration signal in X-direction (m/s2)

A Y :

Acceleration signal in Y-direction (m/s2)

A Z :

Acceleration signal in Z-direction (m/s2)

n :

Spindle rotation (min−1)

f n :

Natural frequency (Hz)

f T :

Tooth-passing frequency (Hz)

f c :

Self-excited chatter frequency (Hz)

F X :

Force signal in X-direction (N)

F Y :

Force signal in Y-direction (N)

F Z :

Force signal in Z-direction (N)

G :

Dynamic compliance (µm/N)

K :

Machinery stiffness (MN/m)

N t :

Number of flutes

V X :

Feeding speed in X-direction (mm/min)

V Y :

Feeding speed in Y-direction (mm/min)

X :

Machine coordinate system in X-axis (mm)

Y :

Machine coordinate system in Y-axis (mm)

Z :

Machine coordinate system in Z-axis (mm)

θ A :

Tool posture in A-axis (°)

θ B :

Tool posture in B-axis (°)

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Acknowledgements

The first author acknowledges the scholarship support from Research & Innovation in Science & Technology Project (RISET-Pro) in Ministry of Research and Technology of the Republic of Indonesia.

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Authors and Affiliations

  1. Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8527, Japan

    Muizuddin Azka, Keiji Yamada, Ryutaro Tanaka & Katsuhiko Sekiya

  2. Agency for the Assessment and Application of Technology (BPPT), Jakarta, 10340, Indonesia

    Muizuddin Azka & Mahfudz Al Huda

Authors
  1. Muizuddin Azka
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  2. Keiji Yamada
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  3. Mahfudz Al Huda
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  4. Ryutaro Tanaka
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  5. Katsuhiko Sekiya
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Correspondence to Keiji Yamada.

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Azka, M., Yamada, K., Huda, M.A. et al. Influence of Tool Posture and Position on Stability in Milling with Parallel Kinematic Machine Tool. Int. J. Precis. Eng. Manuf. 21, 2359–2373 (2020). https://doi.org/10.1007/s12541-020-00416-7

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  • DOI: https://doi.org/10.1007/s12541-020-00416-7

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