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패시브 튜너블 방진 보링바의 설계모델에 대한 연구

홍준희1,#, 곽양양2, 송두상3

A Study on the Design Model of Passive Tunable Damped Boring Bar

Jun-Hee Hong1,#, Yang-Yang Guo2, Doo-Sang Song3
Journal of the Korean Society for Precision Engineering 2017;34(12):917-926.
Published online: December 1, 2017

1 충남대학교 기계공학과

2 한국기계연구원 초정밀시스템실

3 대명테크

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#E-mail: hongjh@cnu.ac.kr, TEL: +82-42-821-5642
• Received: April 24, 2017   • Revised: October 26, 2017   • Accepted: November 13, 2017

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  • Vibration control of boring bar in variable-parameter turning process with stiffness and damping adaptive TMD
    Shipeng Li, Tianlin Yang, Xuda Qin, Hao Li, Jinqi Liu, Qing Zhao
    The International Journal of Advanced Manufacturing Technology.2025; 139(11-12): 5953.     CrossRef

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A Study on the Design Model of Passive Tunable Damped Boring Bar
J. Korean Soc. Precis. Eng.. 2017;34(12):917-926.   Published online December 1, 2017
DOI: https://doi.org/10.7736/KSPE.2017.34.12.917
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A Study on the Design Model of Passive Tunable Damped Boring Bar
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DOI: https://doi.org/10.7736/KSPE.2017.34.12.917
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A Study on the Design Model of Passive Tunable Damped Boring Bar
Image Image Image Image Image Image Image Image Image Image Image Image Image Image Image Image Image Image Image
Fig. 1 Concept model of tunable damped boring bar
Fig. 2 Flow chart of theoretical analysis
Fig. 3 Structure of tunable boring bar body
Fig. 4 Element of tunable damping boring bar body
Fig. 5 Analysis model of DVA
Fig. 6 Analysis model of body on CAE program
Fig. 7 1th Mode analysis result of overhang for body
Fig. 8 Analysis model of DVA on CAE program
Fig. 9 1 th Mode analysis result of DVA
Fig. 10 Design model of tunable damped boring bar
Fig. 11 Photo of passive tunable damped boring bar
Fig. 12 Photo of experiment setup for boring bar body
Fig. 13 Natural frequency of overhang 7d-12d
Fig. 14 Photo of experiment setup for DVA
Fig. 15 Adjusting setup for tunable damped boring bar
Fig. 16 FFT analysis of passive tunable damped boring bar for overhang 9d
Fig. 17 Photo of experiment setup for cutting process
Fig. 18 Comparison between steel bar and tunable damped bar in frequency domain
Fig. 19 Comparison between steel bar and tunable damped bar in surface roughness (Ra)

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A Study on the Design Model of Passive Tunable Damped Boring Bar
Parameter Name Quantity
Head length (l4) 40(mm)
Connector length ( l3) 28(mm)
Tube length (l2) 100(mm)
Vibration output position (l5) 68(mm)
Boring bar’s diameter (d) 25(mm)
Boring bar’s tube inner dia. (D) 16(mm)
Boring bar’s young’s modulus (E) 2E+11(pa)
Boring bar’s density (ρ) 7850(Kg/m3)
Boring bar’s material SCM440
Boring bar’s hardness 33~38(HRC)
Boring Bar overhang(L ) 7d ~ 12d(mm)
Overhang of boring bar : L (mm) Frequency (Hz)
7d (175mm) 538.26
8d (200mm) 431.21
9d (225mm) 351.31
10d (250mm) 290.77
11d (275mm) 244.06
12d (300mm) 207.40
Parameter Name Quantity
Mass’s Diameter (dm) 14(mm)
Spring’s Diameter (ds) 5(mm)
Young’s modulus (E) 1.4312E+11(pa)
Density (ρ) 7850(Kg/m3)
Material SCM440
Hardness 55~60(HRC)
Overhang of boring bar : L (mm) ls (mm)of DVA
7d (175mm) 15
8d (200mm) 21
9d (225mm) 26
10d (250mm) 33
11d (275mm) 38
12d (300mm) 43
Overhang of boring bar : L (mm) Frequency (Hz)
7d (175mm) 582.76
8d (200mm) 465.91
9d (225mm) 378.31
10d (250mm) 309.25
11d (275mm) 260.71
12d (300mm) 220.81
Spring Length ls (mm) Frequency (Hz)
15 (mm) 585.13
21 (mm) 407.51
26 (mm) 343.83
33 (mm) 266.54
38 (mm) 221.14
43 (mm) 197.16
Overhang of boring bar : L (mm) Frequency (Hz)
7d (175mm) 520
8d (200mm) 420
9d (225mm) 340
10d (250mm) 270
11d (275mm) 230
12d (300mm) 195
Spring Length ls (mm) Frequency (Hz)
15 (mm) 530
21 (mm) 415
26 (mm) 325
33 (mm) 265
38 (mm) 225
43 (mm) 190
Boring bar overhang L (mm) Natural frequency of boring bar body
Theoretical analysis (Hz) CAE analysis (Hz) Experiment (Hz)
7d (175) 538.26 582.76 520
8d (200) 431.21 465.91 420
9d (225) 351.31 378.31 340
10d (250) 290.77 309.25 270
11d (275) 244.06 260.71 230
12d (300) 207.40 220.81 195
Spring length ls (mm) Natural frequency of DVA (ls)
Theoretical analysis (Hz) CAE analysis (Hz) Experiment (Hz)
15 538.26 585.13 530
21 431.21 407.51 415
26 351.31 343.83 325
33 290.77 266.54 265
38 244.06 221.14 225
43 207.40 197.16 190
Tunable damped boring bar overhang L (mm) Frequency Domain Damping rate (%)
Amplitude without DVA (m/N) Amplitude with DVA (m/N)
7d (175) 1.18 0.55 53.4%
8d (200) 1.55 0.41 73.5%
9d (225) 1.64 0.43 73.8%
10d (250) 1.19 0.59 50.4%
11d (275) 0.89 0.42 52.8%
12d (300) 0.94 0.35 62.7%
Tunable damped boring bar overhang L (mm) Spring length of DVA ls (mm)
7d (175) 15
9d (225) 26
11d (275) 38
Process condition Quantity
Cutting speed (V) 80(m/min)
Feed (f) 0.132(mm/rev)
Depth (mm) 0.5(mm)
Workpiece (material) SM45C
Workpiece size (Tube type) Inside 60(mm)
Outside 100(mm)
Machine Type Lathe (HL-380)
Tool of insert tip CCMT 09T304
Boring bar overhang L (mm) Frequency domain Damping rate (%)
Amplitude of steel bar (m/N) Amplitude of tunable bar (m/N)
7d (175) 6.52 4.45 31.7%
9d (225) 11.28 3.25 71.2%
11d (275) 7.98 2.17 72.8%
Table 1 Input parameter of tunable boring bar body
Table 2 Theoretical analysis result of tunable damping boring bar body with euler beam theory
Table 3 Input parameter of DVA
Table 4 Tuning result of spring length (ls) on DVA
Table 5 Natural frequencies of boring bar body on CAE
Table 6 Natural frequencies of spring length (DVA) on CAE
Table 7 Natural frequencies of boring bar body on experiment
Table 8 Natural frequency of DVA on experiment
Table 9 Comparison between frequency domain of theoretical review and experimental result in boring bar body
Table 10 Comparison between natural frequencies of CAE and theoretical review in ls for DVA
Table 11 Comparison between impulse test of general system and passive system in tunable damped boring bar
Table 12 Tunable condition of tunable damped boring bar on cutting process
Table 13 Cutting condition of boring process
Table 14 Comparison between cutting process of steel bar and tunable damped boring bar on frequency domain

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