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  1. Ana Sayfa
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Yazar "Kus, Abdil" seçeneğine göre listele

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  • [ X ]
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    ANALYSIS OF THE CUTTING TEMPERATURE AND SURFACE ROUGHNESS DURING THE ORTHOGONAL MACHINING OF AISI 4140 ALLOY STEEL VIA THE TAGUCHI METHOD
    (Inst Za Kovinske Materiale I In Tehnologie, 2016) Motorcu, Ali Rıza; Isik, Yahya; Kus, Abdil; Cakir, Mustafa Cemal
    In this research, the tool-chip interface temperature (T-CTI), the tool temperature (T-T) and the average surface roughness (R-a) were measured experimentally during the turning of AISI 4140 alloy steel with TiAlN-TiN, PVD-coated, WNVG 080404-IC907 tungsten carbide inserts using an IR pyrometer technique, a K-type thermocouple and a portable surface-roughness measurement device, respectively. The workpiece material was heat treated by an induction-hardening process and hardened up to a value of 50 HRC. The Taguchi method L18 (21 x 37) was used for the determination of the optimum control factors. The depth of cut, the cutting speed and the feed rate were taken as control factors. The analysis of variance was applied in order to determine the effects of the control factors on the tool-chip interface temperature, the tool temperature and the surface roughness. The optimum combinations of the control factors for T-CTI, T-T and R-a were determined as a(2)v(1)f(3), a(1)v(3)f(2) and a(2)v(3)f(1), respectively. Second-order predictive models were developed with a linear-regression analysis, and the coefficients of correlation for T-CTI, T-T and R-a were calculated as R-2 = 92.8, R-2 = 68.1 and R-2 = 82.6, respectively.
  • [ X ]
    Öğe
    Estimation of the optimum cutting parameters for surface roughness in wire electrical discharge machining of nickel based waspaloy using Taguchi method
    (Gazi Univ, Fac Engineering Architecture, 2017) Kus, Abdil; Motorcu, Ali Rıza
    In this study, the effects of cutting parameters on the surface roughness in Wire Electrical Discharge Machining (WEDM) of Waspaloy have been investigated and optimal cutting parameters for lowest surface roughness values were determined. As control factors; wire tension, wire feed speed, feed rate and dielectric flushing pressure have been selected and a Taguchi L18 (2(1)x3(3)) orthogonal array was used for experimentation. The statistical effects of cutting parameters on the surface roughness have been determined by using analysis of variance (ANOVA). The second order predictive equation has been developed via Linear Regression Analysis. Using the second-order predictive surface roughness equation developed in the result of this study, the theoretical average surface roughness (R-a) values at a confidence level of 95 percent (R-2=0.936) have been obtained. When evaluating the main effects plots and ANOVA results, the feed rate was found the most efficient factor on the Ra, while dielectric flushing pressure and wire speed were the following ranking factors. The wire tension was seemed to have not of a statistically influence on the R-a. The arithmetic average surface roughness R-a of the WEDM-cut workpiece has been obtained between 2.683 to 4.052 mu m intervals for Waspaloy.
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    Öğe
    Evaluation of surface roughness and material removal rate in the wire electrical discharge machining of Al/B4C composites via the Taguchi method
    (Sage Publications Ltd, 2016) Ekici, Ergun; Motorcu, Ali Rıza; Kus, Abdil
    This study researched the effects of machining parameters on surface roughness and material removal rate in the wire electrical discharge cutting of high-density Al/B4C metal matrix composites produced via the hot pressing method. Wire tension, reinforcement percentage, wire speed, pulse-on time and pulse-off time were set as the control factors. The Taguchi L-18 (2(1)x3(4)) orthogonal array was used in the experiment design and determination of the optimum control factors. Variance analysis was applied to determine the effects of the control factors on the surface roughness and material removal rate. The results showed the most effective parameters to be pulse-on time (30.22%) for surface roughness and wire speed (83.20%) for material removal rate, and the optimum levels of the control factors to be A(2)B(1)C(2)D(1)E(1) and A(2)B(2)C(3)D(2)E(2), respectively. Predictive equations were then developed by applying linear regression analysis, and the adjusted correlation coefficients were calculated as 0.61 for surface roughness and 0.785 for material removal rate.
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    Öğe
    EVALUATION OF TOOL LIFE - TOOL WEAR IN MILLING OF INCONEL 718 SUPERALLOY AND THE INVESTIGATION OF EFFECTS OF CUTTING PARAMETERS ON SURFACE ROUGHNESS WITH TAGUCHI METHOD
    (Univ Osijek, Tech Fac, 2013) Motorcu, Ali Rıza; Kus, Abdil; Arslan, Ridvan; Tekin, Yucel; Ezentas, Ridvan
    In this study, the effects of cutting speed, milling direction (down milling, up milling), coating layer (TiAlN and TiAlN-TiN) and the number of inserts of tool holder on the surface roughness and tool life in dry milling of Inconel 718 superalloy were investigated. In the first place, the effects of control factors on the tool life were studied at the cutting speeds of v = 50 m/min and v = 100 m/min. The alternation of flank wear depending on the cutting time was examined. The types of wear and wear mechanisms were determined by examining the optical images of worn tools. In the second part of the study, for the purpose of investigating the effects of control factors on the surface roughness, L16 Taguchi Technique was used and the optimal control factor levels, giving the lowest value of the average surface roughness parameter (Ra) were determined. The effect of cutting speed on the tool life was more than the effects of the milling type and number of inserts. Down milling resulted in longer tool life compared to up milling method. In up milling, longer tool life was obtained with 2 inserts at low cutting speeds and with 4 inserts at high cutting speeds. TiAlN- TiN coated tools exhibited twice as long tool life than the TiAlN coated tools. For both milling methods, the most effective wear types were flank wear and nose wear.
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    Öğe
    Investigation of the WEDM of Al/B4C/Gr reinforced hybrid composites using the Taguchi method and response surface methodology
    (Walter De Gruyter Gmbh, 2016) Motorcu, Ali Rıza; Ekici, Ergun; Kus, Abdil
    In this study, the effects of machining parameters on the material removal rate (MRR) and surface roughness (Ra) were investigated during the cutting of Al/B4C/Gr hybrid composites by wire electrical discharge machining (WEDM). Wire speed (W-S), pulse-on time (T-on) and pulse-off time (T-off) were chosen as the control factors. The L-27 (3(3)) orthogonal array in the Taguchi method was used in the experimental design and for the determination of optimum control factors. Response surface methodology was also used to determine interactions among the control factors. Variance analysis (ANOVA) was applied in the determination of the effects of control factors on the MRR and Ra. According to the ANOVA results, the most effective parameters on MRR and Ra were wire speed with a 85.94% contribution ratio, and pulse-on-time with a 47.7% contribution ratio. The optimum levels of the control factors for MRR and Ra were determined as A(3)B(3)C(3) and A(1)B(1)C(2). In addition, second-order predictive models were developed for MRR and Ra; correlation coefficients (R-2) were calculated as 0.992 and 0.63.
  • [ X ]
    Öğe
    The evaluation of the effects of control factors on surface roughness in the drilling of Waspaloy superalloy
    (Elsevier Sci Ltd, 2014) Motorcu, Ali Rıza; Kus, Abdil; Durgun, Ismail
    In this study, the effects of cutting tool type (Ct), cutting speed (Vc), feed rate (f) and drill bit angle (A) on the average surface roughness (Ra) were investigated in the drilling of Waspaloy superalloy with coated and uncoated solid carbide drills. Experimental studies were performed in the orthogonal array of L18 (2(1) x 3(3)) by using Taguchi method. A second order predictive equation was developed with Linear Regression Analysis and coefficient of correlation for Ra calculated as R-2 = 96.9%. The most effective parameters on Ra were determined as A, f, Vc and Ct with 49.44%, 15.0%, 14.45% and 13.47% contribution ratios, respectively. Ra surface roughness values increased with the increasing tool wear. In this study, the chip formation and tool wear were also evaluated. Three types chip formation such as spiral chip, string chip and short chip were observed in the drilling of Waspaloy with solid carbide drills. (C) 2014 Elsevier Ltd. All rights reserved.

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