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Technical Brief

Vibration Control of Relative Tool-Spindle Displacement for Computer Numerically Controlled Lathe With Pipe Frame Structure

[+] Author and Article Information
Yoshitaka Morimoto

Mem. ASME
Professor
Director of Advanced Materials Processing
Research Laboratory,
Kanazawa Institute of Technology,
3-1 Yatsukaho, Hakusan,
Ishikawa 924-0838, Japan;
e-mail: mosandb1@neptune.kanazawa-it.ac.jp

Naohiko Suzuki

Takamatsu Machinery Co., Ltd.,
3-1 Asahigaoka, Hakusan,
Ishikawa 924-8558, Japan
e-mail: suzuki@takamaz.co.jp

Yoshiyuki Kaneko, Minoru Isobe

Takamatsu Machinery Co., Ltd.,
3-1 Asahigaoka, Hakusan,
Ishikawa 924-8558, Japan
e-mail: kaneko@takamaz.co.jp

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received February 20, 2013; final manuscript received April 11, 2014; published online May 21, 2014. Assoc. Editor: Tony Schmitz.

J. Manuf. Sci. Eng 136(4), 044502 (May 21, 2014) (4 pages) Paper No: MANU-13-1072; doi: 10.1115/1.4027594 History: Received February 20, 2013; Revised April 11, 2014

A new computer numerically controlled (CNC) lathe with a pipe frame bed has been developed. This structure is expected to have enough space between the truss bars to solve the space problem and have enough rigidity for machine tools. Therefore, a CNC lathe whose frame consists of pipes, joints, and diagonal braces has been developed with enough rigidity and space utility for chip evacuation. From the viewpoint of machine tool usage, real-time vibration control theory is applied to control the relative displacement between the tool post and the spindle to suppress specific relative vibration modes.

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References

Figures

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Fig. 1

Schematic view of developed CNC lathe

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Fig. 2

Typical measurement result of compliance transfer function by conventional impulse excitation method on a representative point

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Fig. 3

Transfer function between input force and relative displacement (tool post and spindle)

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Fig. 4

Mode shape vector (top view)

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Fig. 5

Schematic diagram of PZT actuator for vibration control

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Fig. 6

Transfer function between input voltage of actuator and table displacement by impulse response

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Fig. 7

Block diagram for vibration control

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Fig. 8

Comparison of relative motion during cutting

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Fig. 9

Comparison of frequency analysis of relative vibration between tool and spindle during cutting

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Fig. 10

Comparison of axial profile of machined workpiece measured by surface roughness tester without low-pass filter

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Fig. 11

Comparison of harmonic analysis of measured roundness

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