C.N. Chu

University of Science and Technology of China

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Duck K. Choi

Seoul National University

B.H. Kim

Kangwon National University

Won Tae Kwon

University of Seoul

B.H. Kim

Seoul National University

Gwan-Shik Kim

Koh Young Technology (South Korea)

J.M. Lee

Seoul National University

Y.S. Lee

Daegu Catholic University Medical Center

B.J. Park

Seoul National University

Nannaji Saka

Massachusetts Institute of Technology

Nam P. Suh

IIT@MIT

Cooperative Institutions

Seoul National University

Kyungpook National University

University of Science and Technology of China

Samsung (South Korea)

Kyung Hee University

Massachusetts Institute of Technology

Seoul National University of Science and Technology

Pohang University of Science and Technology

IIT@MIT

Yonsei University

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The Effects of Tool Electrode Size on Characteristics of Micro Electrochemical Machining

CIRP Annals (2006)

B.J. Park B.H. Kim C.N. Chu

Electrical Discharge Machining

Electrochemical Machining

10.1016/s0007-8506(07)60397-7

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Citations (108)

Prevention of exit burr in microdrilling of metal foils by using a cyanoacrylate adhesive

The International Journal of Advanced Manufacturing Technology (2005)

D.W. Kim Y.S. Lee C.N. Chu Young-Taek Oh

Rivet

10.1007/s00170-004-2304-3

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Citations (15)

Development of Strip EDM

Procedia CIRP (2013)

Ki Young Song Do Kwan Chung M.S. Park C.N. Chu

Electrical discharge machining (EDM) is a widespread machining method for the die and mold industry. This method can machine all conductive materials, including hard-to-cut metals, because the machining process uses electro-thermal energy without a cutting force. During EDM, discharge sparks remove not only the material of a workpiece but also the material of an electrode. This machining mechanism thereby causes electrode wear, which creates serious problems, including make-shape errors and low productivity. In order to overcome such problems, a new EDM method using a strip electrode (strip EDM) was developed in this study. Strip EDM uses a continuously applied strip electrode similar to the wire electrode in wire EDM. In the suggested strip-electrode method, a conductive strip moves on the electrode guide. The worn strip is removed, and a new one is supplied continuously. Therefore, the tool electrode acquires no wear during the machining process. This method uses a conductive strip that is made of brass. In the practical machining process, the strip EDM method was applied to EDM milling and EDM turning and their machining characteristics were compared with general EDM methods.

Electrical Discharge Machining

Brass

10.1016/j.procir.2013.03.012

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Citations (7)

A Study on Real-time Monitoing of Tool Fracture in Turning

Journal of the Korean Society for Precision Engineering (1995)

D.K. Park C.N. Chu Jong Min Lee

This paper presents a new methodology for on-line tool breadage detection by sensor fusion of an acoustic emission (AE) sensor and a built-in force sensor. A built-in piezoelectric force sensor, instead of a tool dynamometer, was used to measure the cutting force without altering the machine tool dynamics. The sensor was inserted in the tool turret housing of an NC lathe. FEM analysis was carried out to locate the most sensitive position for the sensor. A burst of AE signal was used as a triggering signal to inspect the cutting force. A sighificant drop of cutting force was utilized to detect tool breakage. The algorithm was implemented on a DSP board for in-process tool breakage detection. Experiental works showed an excellent monitoring capability of the proposed tool breakage detection system.

Turret

Breakage

Acoustic Emission

SIGNAL (programming language)

Dynamometer

Machine tool

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Citations (0)

A Fluid Dynamic Analysis Model of the Ultra-Precision Cutting Mechanism

CIRP Annals (1999)

Kiwon Kwon D.W. Cho S.J. Lee C.N. Chu

Curling

Cutting fluid

Flank

Cutting tool

Chip formation

10.1016/s0007-8506(07)63128-x

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Citations (31)

Feed-Rate Optimization of Ball End Milling Considering Local Shape Features

CIRP Annals (1997)

C.N. Chu Sang Youn Kim J.M. Lee B.H. Kim

Ball (mathematics)

End milling

Shape Optimization

10.1016/s0007-8506(07)60859-2

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Citations (40)

Friction Experimental Test for Omni-Directional Robot Wheel

Proceedings of the Korean Society of Precision Engineering Conference (2013)

Seung-Hak Shin C.N. Chu Seong‐Han Kim Dong-Yun Yeo

Source

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Citations (0)

Micro Electrochemical Machining of 3D Micro Structure Using Dilute Sulfuric Acid

CIRP Annals (2005)

B.H. Kim C.W. Na Y.S. Lee Duck K. Choi C.N. Chu

Electrochemical Machining

Nanosecond

10.1016/s0007-8506(07)60081-x

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Citations (180)

Prediction of Specific Cutting Pressure in Face Milling Considering Tool Rake Angles

Journal of the Korean Society for Precision Engineering (1997)

Shi-Hyoung Ryu C.N. Chu

In this study, investigated are the effects of tool rake angles and the change of cutting conditions on the specific cutting pressure in face milling. The cutting force in face milling is predicted from the double cutting edge model in3-dimensional cutting. Conventional specific cutting pressure model is modified by considering the variation of tool rake angles. Effectiveness of the modified cutting force model is verified by the experiments using special face milling cutters with different cutter pockets and various rake angles. From the comparison of the presented model and the specific cutting pressure, it is shown that the axial force can be predicted by the tangential force, radial force and geometric conditions. Also, the rela- tionship between specific cutting pressure and cutting conditions including feedrate, cutting velocity and depth of cut is studied.

Rake

Rake angle

Milling cutter

Cutting tool

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Citations (0)

Design, Modeling, and Control of an Aurelia-Inspired Robot Based on SMA Artificial Muscles

Biomimetics (2023)

Yang Yihan C.N. Chu Hu Jin Qiqiang Hu Min Xu

This paper presented a flexible and easily fabricated untethered underwater robot inspired by Aurelia, which is named "Au-robot". The Au-robot is actuated by six radial fins made of shape memory alloy (SMA) artificial muscle modules, which can realize pulse jet propulsion motion. The thrust model of the Au-robot's underwater motion is developed and analyzed. To achieve a multimodal and smooth swimming transition for the Au-robot, a control method integrating a central pattern generator (CPG) and an adaptive regulation (AR) heating strategy is provided. The experimental results demonstrate that the Au-robot, with good bionic properties in structure and movement mode, can achieve a smooth transition from low-frequency swimming to high-frequency swimming with an average maximum instantaneous velocity of 12.61 cm/s. It shows that a robot designed and fabricated with artificial muscle can imitate biological structures and movement traits more realistically and has better motor performance.

10.3390/biomimetics8020261

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Citations (4)