MEHTAP YAVUZ, Harun GÖKÇE, Çağlar YAVAŞ, İHSAN KORKUT, ULVİ ŞEKER

Matkap geometrisinin delik kalitesi ve kesme performansına etkisi

Bu çalışmada, farklı matkap geometrileri ve kesme parametrelerinin delme performansı üzerine etkileri sistematik bir şekilde incelenmiştir. Farklı geometrilere sahip dört tip matkap kullanılarak itme kuvveti, moment, yüzey pürüzlülüğü ve geometrik toleranstan sapma değerleri ölçülmüştür. Deneysel çalışmalarda ticari olarak temin edilebilen yaygın iki takım geometrisi ile özgün iki kanal geometrisinin performansları test edilmiştir. Delme operasyonu, 10 mm çapında, iki ağızlı, helisel, yekpare sementit karbür matkaplar kullanılarak GGG 50 malzemesi üzerinde gerçekleştirilmiştir. Deney deseni için matkabın geometrik formu, kesme hızı ve ilerleme miktarı olmak üzere dörder seviyeli üç farklı kontrol faktörü ile bir Taguchi Deney Tasarımı oluşturulmuştur. Deney sonuçlarının değerlendirilmesinde Taguchi S/N analizi ve elde edilen verilerin işlendiği grafikler kullanılmıştır. Anova analizi yardımıyla da deney parametrelerinin deney sonuçları üzerindeki önemi ve etki oranları bulunmuştur. Deneysel sonuçlar değerlendirilerek optimum geometri ve optimum işleme şartları belirlenmiştir. Taguchi Sinyal-Gürültü analizinde “en küçük en iyidir” yaklaşımıyla değerlendirilen sonuçlara göre; ilerleme kuvveti, giriş-çıkış yüzey pürüzlülüğü, dairesellikten sapma ve diklikten sapma açısından özgün olarak geliştirilen 4 numaralı takım geometrisi diğer geometrilere üstünlük sağlarken, ilerlemenin en düşük olduğu (0,15 mm/dev.) ve kesme hızının en yüksek olduğu (110-120 m/dak.) kesme parametreleri ise kontrol faktörlerinin optimum seviyeleri olarak belirlenmiştir.

Effect of drill geometry on hole quality and cutting performance

In this study, the effects of different drill geometries and cutting parameters on drilling performance have been systematically investigated. Using four types of drills with different geometries, thrust, torque, surface roughness and geometric tolerance deviations are measured. Experimental studies have tested the performance of commercially available two-tool geometry and developed original two-channel geometry. The drilling operation was performed on GGG 50 material using a 10 mm diameter, two-spindle, helical, solid cementitious carbide drills. For experiment design, a Taguchi Test Design was created with three different control factors of four levels, geometric form of drill, cutting speed and feed. The taguchi S/N analysis and the graphs in which the obtained data were processed were used in the evaluation of the test results. With the help of the Anova analysis, importance and influence rate on the test results of experimental parameters found. Experimental results were evaluated and optimum geometry and optimum cutting conditions were determined. According to the results evaluated by "the smallest best" approach in Taguchi signal-noise analysis; The originally tool 4 has superiority to other geometries in terms of thrust force, Input-output surface roughness, deviation from circularity, deviation from perpendicularity, The cutting parameters with the lowest feed rate (0,15 mm/rev.) and the highest cutting speed (110-120 m/min.) were determined as the optimum levels of control factors.

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