MQL Drilling of Austenitic Stainless Steel using Refined Palm Olein: Effect of Coating Tool on Surface Roughness and Tool Wear

Ahmad, Zubair Sultan and Safian, Sharif and Denni, Kurniawan (2016) MQL Drilling of Austenitic Stainless Steel using Refined Palm Olein: Effect of Coating Tool on Surface Roughness and Tool Wear. In: International Symposium on Green Manufacturing and Applications 2016, 25 June 2016, Nusa Dua, Bali, Indonesia. (In Press)

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This present study investigates the effect of tool coating during minimum quantity of lubricant (MQL) drilling of austenitic stainless steel using refined palm olein (RPO) as cutting fluid. Two types of tool coating, which are TiAlN and TiSiN, on tungsten carbide drill with diameter 4±0.01 mm, point angle of 130° and helix angle of 30° were used in this study to machine AISI 316L stainless steel workpiece with dimension was 102 mm x 60 mm x 10 mm and microhardness 179.5 HV. Drilling tests are conducted on DECKEL MAHO DMC835V CNC machining centre with cutting speed of 12 m/min and feed rate of 0.025 mm/rev. The MQL system in this trial delivered using Economizer I with 5.5 bar air supplied, the spray output was 27 ml/h, adjusted 20 degrees and located 35 mm away from the cutting tool. Tool wear measured continuously during experimental process using Raxvision tool microscope connected to iSolution image analyzer software. Tool overhang was set at 30 mm. Surface roughness (Ra) is measured with an Accretech Handysurf tester. The cut–off and sampling lengths for each measurement are taken as 0.8 and 4 mm, respectively. For each hole, the surface roughness is measured parallel to the drilled axis at four radial positions at 0°, 90°, 180° and 270° using a surface tester. The surface roughness is an average taken from twelve measurements from three times repeated at each position. Tool life of the drill and surface roughness of the drilled hole were the machining responses investigated. It was found that the MQL-RPO drilling using TiSiN coated carbide tool produced better result in terms of tool life (reaching 7.54 minutes) compared to using TiAlN coated tool (of only 4.19 minutes). On the other hand, related to surface roughness, the best result was obtained by TiAlN coated tool. Through two-factor anova with replication on 1st hole, it was found that wear of the tool affect the surface roughness significantly while different types of coating has no significant effect on tool wear and surface roughness. In addition, there is no interaction between types of coating and wear of the tool that influence the surface roughness.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: : Machinability; Stainless steel; MQL; Drilling; Coated carbide; Tool Wear; Surface roughness
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Department of Mechanical Engineering > Teknik Manufaktur
Depositing User: Dr Ahmad Zubair Sultan
Date Deposited: 29 Dec 2016 00:31
Last Modified: 29 Dec 2016 00:32

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