TY - GEN
T1 - Effects of friction models, geometry and position of tool on curving tendency of micro-extrusion 6063 aluminum alloy pins
AU - Sucharitpwatskul, Sedthawatt
AU - Mahayotsanun, Numpon
AU - Mahabunphachai, Sasawat
AU - Funazuka, Tatsuya
AU - Takatsuji, Norio
AU - Dohda, Kuniaki
N1 - Funding Information:
The authors would like to acknowledge the supports of Thailand Research Fund under the grant number MRG5980148, National Metal and Materials Technology Center (MTEC), Thailand, University of Toyama, Japan, Department of Mechanical Engineering, Northwestern University, USA, and Department of Mechanical Engineering, Faculty of Engineering, Khon Kaen University, Thailand.
PY - 2017
Y1 - 2017
N2 - Micro-extrusion process is one of the micro-forming technology for fabrication of micro-parts such as micro-gear shaft for microelectromechanical system (MEMS) and micro pins for electronic parts. This paper presents the friction models effects and geometry effects on curving tendency of micro-extrusion 6063 aluminum alloy pins. Three friction models were considered: (1) Coulomb friction, (2) plastic shear friction, and (3) combined (Coulomb & plastic shear) friction. The finite element simulation was carried out and the results showed that the combined friction model accurately predicted the micro-extrusion results. Then, four tool geometry and position effects were investigated: (1) punch shift length, (2) die angle, (3) die shift length, and (4) bearing length. The finite element simulation was carried out to determine these tool geometry and position effects on the curving tendency of micro-extruded pins. The results showed that punch shift length and die angle did not affect the curving tendency. However, die shift length caused the micro-extruded pins to curve. The increase in bearing length helped straighten the micro-extruded pins.
AB - Micro-extrusion process is one of the micro-forming technology for fabrication of micro-parts such as micro-gear shaft for microelectromechanical system (MEMS) and micro pins for electronic parts. This paper presents the friction models effects and geometry effects on curving tendency of micro-extrusion 6063 aluminum alloy pins. Three friction models were considered: (1) Coulomb friction, (2) plastic shear friction, and (3) combined (Coulomb & plastic shear) friction. The finite element simulation was carried out and the results showed that the combined friction model accurately predicted the micro-extrusion results. Then, four tool geometry and position effects were investigated: (1) punch shift length, (2) die angle, (3) die shift length, and (4) bearing length. The finite element simulation was carried out to determine these tool geometry and position effects on the curving tendency of micro-extruded pins. The results showed that punch shift length and die angle did not affect the curving tendency. However, die shift length caused the micro-extruded pins to curve. The increase in bearing length helped straighten the micro-extruded pins.
KW - Alluminum alloy
KW - Curving
KW - Finite element method
KW - Friction
KW - Geometry
KW - Micro-extrusion
KW - Position
UR - http://www.scopus.com/inward/record.url?scp=85027025210&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85027025210&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/KEM.739.135
DO - 10.4028/www.scientific.net/KEM.739.135
M3 - Conference contribution
AN - SCOPUS:85027025210
SN - 9783035710762
T3 - Key Engineering Materials
SP - 135
EP - 142
BT - Engineering Tribology and Materials - ICETAT 2016
A2 - Hwang, Yunn Lin
A2 - Horng, Jeng Haur
PB - Trans Tech Publications Ltd
T2 - International Conference on Engineering Tribology and Applied Technology, ICETAT 2016
Y2 - 4 November 2016 through 6 November 2016
ER -