Deney tasarımı teknikleri mühendislik çalışmalarına önemli avantajlar getirmektedirler. Çalışmada bu yaklaşımın detayları, ince sert seramik kaplı (TiAlN ve TiN) matkap uçlarının performans optimizasyonu örneği ele alınarak incelenmiştir. Hedeflenen optimum noktaya ulaşabilmek için endüstriyel ortamda en önemli faktörler olan kaplama türü, kesme hızı ve ilerleme hızının etkileri Taguchi Deney Tasarımı tekniği yardımı ile incelenmiştir. Deney sonuçlarının değerlendirilmesinde varyans analizi ve sinyal/gürültü oranı kullanılmış, deneyler ise Taguchi L9 dik düzenine göre yapılarak, Tam Faktöriyel Deney Tasarımında gereken deney sayısının sadece üçte biri ile (27 yerine 9 deney) hedeflenen sonuçların elde edilmesi mümkün olmuştur.Anahtar Kelimeler: Deney tasarımı, ince sert seramik kaplamalar, Taguchi.In this paper advantages of design of experiment techniques in engineering applications were investigated by the example of the performance optimization problem of hard ceramic coatings on HSS drills. TiN and TiAlN coatings on HSS tools have shown significant improvements on tool life. To achieve the limits of the improvements, optimization of processing parameters is as important as the selection of proper coating type. Cutting speed and feeding rate have been chosen as the most important process parameter, which can be easily adjusted under industrial conditions. The work focused on the main effects of coating type, cutting speed and feeding rate on the overall performance by using design of experiment techniques. The statistical methods of signal-to-noise ratio and analysis of variance are applied for the analysis of the results and for the determination of the effects of each parameter on the drilling process. Design of the experiments is based on Taguchi L9 orthogonal array, which provides a decrease of the necessary number of experiments to 1/3 of a conventional full factorial design. As a result, the analyses show that an optimum cutting force is provided in case of TiAlN coatings, when cutting speed is 25 m/min and feeding rate is 164 mm/min. The efficiency of the optimization by Taguchi technique under industrial conditions has been proved by the decrease of the number of necessary experiments from 27 to 9.Keywords: Design of experiments, hard ceramic coatings, Taguchi
