Technical Brief

Experimental Verification of Dynamic Behavior of a Capsule-Type Modular Machine Tool for Multifunctional Processes

[+] Author and Article Information
Sungcheul Lee

Department of Ultra Precision Machines and Systems,
Korea Institute of Machinery and Materials,
156, Gajeongbuk-ro, Yuseong-gu,
Deajeon 34103, South Korea
e-mail: sclee@kimm.re.kr

Jong-Kweon Park

Department of Ultra Precision Machines and Systems,
Korea Institute of Machinery and Materials,
156, Gajeongbuk-ro, Yuseong-gu,
Deajeon 34103, South Korea
e-mail: jkpark@kimm.re.kr

1Corresponding author.

Manuscript received January 31, 2017; final manuscript received September 15, 2017; published online November 16, 2017. Assoc. Editor: Laine Mears.

J. Manuf. Sci. Eng 140(1), 014501 (Nov 16, 2017) (10 pages) Paper No: MANU-17-1054; doi: 10.1115/1.4037999 History: Received January 31, 2017; Revised September 15, 2017

A capsule-type modular machine tool was developed, which was capable of multifunctional processes with a single setup. This mechanism was designed according to the concept of a reconfigurable machine tool (RMT), which can transform from a machining center to a lathe, and is capable of multiple functional processes, such as laser, milling, and grinding processes. After addressing the kinematics of the machine, a static structural analysis was performed and some ribs were added to enhance the stiffness. A frequency response function (FRF) simulation was conducted on the modified machine and natural frequencies were determined to avoid resonance in processing. Then, an FRF test was performed to find the actual natural frequencies, to confirm the simulation results. After investigating the natural frequencies, high-speed machining was performed to make 300 μm sized patterns.

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Fig. 1

System configuration (a) and motion of each axis (b)

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Fig. 3

Milling stage (a) and turning stage (b) of the lower stage

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Fig. 4

Coordinates of the machine

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Fig. 8

Design modification of the top frame

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Fig. 9

Static structural analysis of A-type (a) and B-type (b)

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Fig. 10

Similar mode shape of A-and B-type: (a) mode shape of A-type and (b) mode shape of B-type

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Fig. 7

The postprocessor for capsule-type modular machine tool

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Fig. 13

Experimental setup for modal test

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Fig. 14

Impact and measured in the Z direction (ωn = 227 Hz)

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Fig. 17

Impact on the spindle and measured the stage in the X direction (ωn = 159.0 Hz)

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Fig. 11

Harmonic response analysis of B-type

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Fig. 12

Implementation of the machine (a) and GUI (b)

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Fig. 15

Impact and measured in the Y direction

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Fig. 16

Impact force and measured in the X direction (ωn = 41 Hz)

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Fig. 18

Result of milling process: (a) input model and (b) machining result

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Fig. 19

Result of laser process: (a) laser process and (b) process result



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