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Effect of High-speed Parameters on Uncoated Carbide Tool in Finish Turning Titanium
Ti-6Al-4V ELI
(Kesan Parameter Berkelajuan
Tinggi terhadap Mata Alat Berkabida tak Bersalut bagi Larikan Titanium
Ti-6Al-4V ELI)
M.A. SULAIMAN2, C.H.
CHE
HARON1*, J.A.
GHANI1& M.S. KASIM2 1Department
of Mechanical and Material EngineeringFaculty of Engineering and
Built Environment Universiti Kebangsaan
Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia 2Department
of Process, Faculty of Manufacturing Engineering, Universiti Teknikal
Malaysia Melaka 76100 Hang Tuah
Jaya, Melaka
Diserahkan: 21
Mac 2012/Diterima: 15 Mei 2012
ABSTRACT
In this work, the Sandvik uncoated
carbide insert, CNGG 120408-SGF-H13A was used as a
cutting tool in high-speed turning of titanium alloy Ti-6Al-4V ELI (extra-low
interstitial) with hardness of 32 HRC. Wear is one of the
problems that cannot be avoided in machining process. Therefore, the objective
of this paper was to investigate tool-wear behavior of various cutting-speed
values (high-speed range) on the tool life of the cutting tools, especially in
finishing titanium alloy. The experiments were performed under flooded coolant
condition using water-based mineral-oil. The cutting speeds employed were 120,
170 and 220 m/min. The feed rate was constant at 0.2 mm/rev and the depth of
cut was 0.4 mm. Based on the results, the highest cutting speed of 220 m/min
caused the highest wear rate. By linking the machine operations and the tool
life curves obtained using flank wear data, the wear behavior of uncoated
carbide was described.
Keywords: Coolant; high speed
turning; Ti-6Al-4V ELI; uncoated carbide
ABSTRAK
Dalam kajian ini, mata pemotong
karbida tidak bersalut buatan Sandvik; CNGG 120408-SGF-H13A telah
digunakan sebagai alat pemotongan dalam larikan kelajuan tinggi terhadap
titanium aloi Ti-6Al-4V ELI (tambahan rendah celahan) yang
mempunyai kekerasan 32 HRC. Kehausan mata pemotong adalah
salah satu masalah yang tidak dapat dielakkan dalam proses melarik. Oleh itu,
objektif kajian ini adalah untuk melihat kelakuan kehausan mata pemotong pada
pelbagai nilai kelajuan pemotongan (pada julat kelajuan tinggi) terhadap jangka
hayat mata pemotong terutama untuk proses larikan akhiran titanium aloi.
Eksperimen ini telah dilakukan di bawah keadaan penyejuk banjir dengan
menggunakan minyak mineral berasaskan air. Kelajuan pemotongan adalah 120, 170
dan 220 m/min. Sementara itu, kadar suapan adalah malar pada kadar 0.2
mm/pusingan dan kedalaman pemotongan pada 0.4 mm. Berdasarkan keputusan yang
diperoleh, didapati bahawa kelajuan pemotongan tertinggi, 220 m/min
mengakibatkan kadar kehausan yang tertinggi pada mata pemotong. Dengan
menghubungkan operasi pemesinan dan keluk hayat mata pemotong yang diperoleh
dengan menggunakan data haus rusuk, kelakuan haus karbida tidak bersalut telah
diterangkan.
Kata
kunci: Karbida tidak bersadur; larikan berkelajuan tinggi; pelinciran;
Ti-6Al-4V ELI
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*Corresponding author; email: chase@eng.ukm.my
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