Sains Malaysiana 42(12)(2013):
1727–1733
Analysis
of Laser Sintered Materials Using Finite Element Method
(Analisis Terhadap Bahan Kerja Sinteran Laser Menggunakan Teknik
Unsur Terhingga)
AHMAD SHAHIR BIN JAMALUDIN*
& ABDULLAH
BIN YASSIN
Department of Mechanical and Manufacturing
Engineering, Faculty of Engineering
Universiti Malaysia Sarawak, 94300 Kota
Samarahan, Sarawak, Malaysia
Diserahkan: 19 Mac 2012/Diterima: 30 Mei 2012
ABSTRACT
Invention of milling combined laser sintering system (MLSS)
is able to reduce the mould manufacturing time and improve the mould accuracy.
Thus, more study is needed to increase the understanding for the laser sintered
material machining characteristic to gain benefit from the invention of MLSS.
This paper clarified the analysis of laser sintered material machinability with
the application of Finite Element Method (FEM). Mild steel AISI1055
was applied in developing the Finite Element model in this study due to its
popularity in machinability test and adequate level of data availability. 2D
orthogonal cutting was employed on edge design tools with updated Lagrangian
coupled thermo mechanical plane strain model. Adaptive meshing, tool edge
radius and various types of friction models were assigned to obtain efficient
simulations and precise cutting results. Cutting force and cutting-edge
temperature estimated by Finite Element Method are validated against
corresponding experimental values by previous researchers. In the study,
cutting force increases when radial depth increases and lowest error acquired
when the shear friction factor of 0.8 was applied. Machining simulation for
laser sintered materials estimated lower cutting force compared with mild steel AISI1055
due to lower Young modulus. Higher cutting temperature estimated for machining
simulation laser sintered material compared with machining simulation mild
steel AISI1055
due to its low thermal conductivity
.
Keywords: Cutting force prediction; cutting temperature
prediction; finite element method (FEM); friction model; 2D orthogonal end
milling
ABSTRAK
Reka cipta sistem sinteran laser berpemotong (MLSS)
mampu mengurangkan tempoh penghasilan acuan dan meningkatkan kejituan acuan. Oleh kerana itu, kajian yang lebih mendalam
adalah perlu bagi mengukuhkan pemahaman terhadap ciri pemesinan bahan kerja
sinteran laser untuk mendapatkan manfaat daripada reka cipta MLSS. Kertas
ini menjelaskan tentang analisis terhadap kebolehmesinan bahan kerja sinteran
laser dengan meramalkan daya, suhu pemotongan dan perbandingan bersama
kebolehmesinan keluli lembut AISI1055 menggunakan teknik unsur terhingga (FEM). Keluli lembut AISI1055 diguna pakai dalam pembikinan model
unsur terhingga kerana kepopularannya dalam ujian kebolehmesinan dan kuantiti
data yang diperoleh agak memuaskan. Model simulasi untuk reka bentuk
mata alat pemotong dihasilkan menggunakan model pemotong ortogon 2D dengan
aplikasi formulasi Lagrangian terhadap model satah terikan termo mekanikal.
Siratan beradaptif, radius mata pemotong dan pelbagai jenis model geseren
digunakan untuk memperoleh simulasi yang efisien dan keputusan yang tepat.
Nilai daya potongan dan suhu mata pemotong yang diramalkan akan dibandingkan dengan nilai uji kaji daripada kajian terdahulu. Dalam kajian ini, daya mata pemotong menunjukkan pertambahan nilai
apabila kedalaman radial mata pemotong meningkat dan nilai ralat terendah
diperoleh ketika faktor geseren ricih, m 0.8 digunakan. Simulasi pemesinan bahan kerja sinteran laser meramalkan daya
potongan yang rendah apabila dibandingkan dengan keluli lembut AISI1055 disebabkan
pemalar Young yang lebih rendah. Suhu pemotong untuk
pemesinan bahan kerja sinteran laser diramalkan lebih tinggi berbanding keluli
lembut AISI1055 kerana
kekonduksian haba yang rendah.
Kata kunci: Jangkaan daya pemotongan; jangkaan
suhu pemotongan; model geseran; pemotong ortogon 2D; teknik unsur terhingga (FEM)
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*Pengarang untuk surat-menyurat; e-mail: aero_zephyr@yahoo.com
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