Ali Riza Motorcu

Investigation of the WEDM of Al/B4C/Gr reinforced hybrid composites using the Taguchi method and response surface methodology

Abstract 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 (WS), pulse-on time (Ton) and pulse-off time (Toff) were chosen as the control factors. The L27 (33) 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 A3B3C3 and A1B1C2. In addition, second-order predictive models were developed for MRR and Ra; correlation coefficients (R2) were calculated as 0.992 and 0.63.

Evaluation of surface roughness and material removal rate in the wire electrical discharge machining of Al/B4C composites via the Taguchi method

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 L18 (21 × 34) 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 A2B1C2D1E1 and A2B2C3D2E2, 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.

Laminant Kompozitin Cep Frezelenmesinde Yüzey Pürüzlülüğü Ve Boyutsal Tamlığın Değerlendirilmesi

Bu calismada, laminat kompozitler uzerine cep islemede kontrol faktorlerinin (takim yolu stratejisi, takim tipi ve malzemesi, kesme hizi, ilerleme miktari, kesici takimin yana kayma mesafesi) yuzey puruzlulugu ve boyutsal tamlik uzerindeki ana etkileri, % katkilari ve optimum degerleri Taguchi Metodu, ana etki grafikleri, Varyans analizi ve Gri Iliskisel Analiz yontemi kullanilarak belirlenmistir. Calisma sonuclarina gore, yuzey puruzlulugu uzerinde en etkili parametreler sirasiyla kesici takim geometri ve malzemesi (% 70.90), kesme hizi (%9.40) ve yana kayma mesafesi (%8.20) olmustur. Ayni sekilde, boyutsal tamlik uzerinde de kesici takim tipi ve malzemesinin (%99.35) anlamli bir etkisi gozlemlenmis iken diger parametrelerin toplam etkisi % 1’in altinda kalmistir. Hem minimum yuzey puruzlulugu ve hem de nominal olculere daha yakin boyutsal tamlikta cepler elde etmek icin kontrol faktorlerinin optimum seviyeleri; TPS 2 :Dogrusal cep isleme, Ct 3 :Yuvarlak uclu helisel HSS parmak freze, Vc 3 :350 m/dak, f 2 :0.011 mm/dev ve SO 1 :3 mm olarak belirlenmistir. Diger taraftan, kompozit laminatlar uzerine cep islemede yuzey puruzlulugu ve boyutsal tamlik uzerinde karbur takimlarin performansi zayif bulunmustur.

Evaluation of the delamination factor for drilling of compact laminate composite material with tungsten carbide tools

1Çanakkale Teknik Bilimler Meslek Yüksekokulu, Çanakkale Onsekiz Mart Üniversitesi, Çanakkale, Türkiye. tuncaybilge@comu.edu.tr 2Endüstri Mühendisliği Bölümü, Mühendislik Fakültesi, Çanakkale Onsekiz Mart Üniversitesi, Çanakkale, Türkiye. armotorcu@comu.edu.tr 3Takım Tezgâhları ve İmalat Bölümü, Makine ve İmalat Mühendisliği Fakültesi, Ruse Angel Kanchev Üniversitesi, Ruse, Bulgaristan akivanov@uni-ruse.bg