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Norfauzi Tamin
a:1:{s:5:"en_US";s:48:"Fakulti Pendidikan Teknikal dan Vokasional, UTHM";}
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering

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Influence of Machining Parameters on Surface Roughness in Trochoidal Milling of Ti-6Al-4V via Response Surface Methodology Nur Aina Farhanah Aziz; Norfauzi Tamin; Kahirol Mohd Salleh; Hairizal Osman; Tun Danish Tun Mohamed Kamarul
Journal of Engineering and Technological Sciences Vol. 58 No. 5 (2026): Vol. 58 No. 5(2026): October
Publisher : Directorate for Research and Innovation, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2026.58.5.3

Abstract

Machining of Ti-6Al-4V titanium alloy poses significant challenges, mainly due to its low thermal conductivity and tendency to form a built-up edge (BUE), which can lead to high surface roughness (Ra) and rapid tool wear. In this context, the trochoidal milling strategy emerges as a promising solution, as it can reduce thermal and mechanical loads by using a spiral-shaped tool path with intermittent contact between the tool and Ti-6Al-4V. Therefore, this research aims to evaluate the effectiveness and optimise the machining parameters, specifically, cutting speed (vc) and feed rate (vf), when using the trochoidal strategy for machining Ti-6Al-4V, with the primary objective of minimising Ra. The methodology used is Response Surface Methodology (RSM) with a Central Composite Design (CCD) to model the nonlinear relationships among vc, vf, and Ra. The experiment was conducted using a 3-axis CNC machining centre with carbide cutting tools. Based on the optimisation results, the optimal parameter combination to minimise Ra is 155 m/min for vc and 124 mm/min for vf. Experimental validation tests of the predicted optimal parameters yielded an Ra value of 0.118 μm, with an error of 2.47% relative to the RSM-predicted value, confirming the model’s applicability. In conclusion, this research confirms that targeted parameter optimisation using RSM is highly effective in improving the surface quality of Ti-6Al-4V, further proving the potential of the trochoidal strategy as an efficient method for critical applications in the aerospace and biomedical sectors where surface integrity is a prerequisite.
Low Machining Parameters Produce High Cutting Performance when Machining AISI 1045 at Dry Cutting Conditions Using a CNC Lathe Machine Iqmal Farhan Rashidi; Norfauzi Tamin; Ridhwan Rani; Umar Al Amani Azlan; Norfariza Ab Wahab; Anwar Ismail; Agung Setyo Darmawan
Journal of Engineering and Technological Sciences Vol. 57 No. 5 (2025): Vol. 57 No. 5 (2025): October
Publisher : Directorate for Research and Innovation, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.5.2

Abstract

AISI 1045 medium-carbon steel is widely used for machining because of its excellent machinability. It balances strength and workability in various manufacturing applications, including machinery parts, gears, mold pins, automotive parts, crankshafts, bolts, and studs. The most significant disadvantage of AISI 1045 machining is that if the cutting parameters are not managed appropriately, it can affect the efficiency of the machining process, which involves tool life and product surface finish at dry cutting conditions. This study aims to determine suitable cutting parameters for AISI 1045, identify the optimum minimum tool wear (VB), and assess surface roughness (Ra). This study used various machining parameters at a cutting speed (Vc) of 35–53 m/min, feed rate (fr) of 0.15, and 0.5 mm/rev at a 1 mm constant depth of cut (DOC). The results showed that a Vc of 35 m/min and a fr of 0.15 mm/rev obtained the lowest average VB of 0.07 mm and Ra of 3.8 µm. This study found that low machining parameters produce high dry-cutting performance. This study provides guidelines for machinists to use appropriate cutting parameters when machining AISI 1045 under dry-cutting conditions at short machining times. In addition, it promotes sustainable machining and prevents air pollution from using coolants (chemical reactions).
Co-Authors Agung Setyo Darmawan Anwar Ismail Hairizal Osman Iqmal Farhan Rashidi Kahirol Mohd Salleh Norfariza Ab Wahab Nur Aina Farhanah Aziz Ridhwan Rani Tun Danish Tun Mohamed Kamarul Umar Al Amani Azlan