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Çökelme sertleşmesi ile yaşlandırılmış paslanmaz çelikler, diğer paslanmaz çelik türlerine göre daha üstün özelliklere sahiptir. Bu üstün özeliklerin en önemlileri mekanik ve termal özelliklerdir. 17-4 PH paslanmaz çeliği; nükleer endüstriden havacılık endüstrisine kadar birçok alanda tercih edilmektedir. Bu çalışmada, 17-4 PH paslanmaz çeliğinin farklı kaplama türlerine sahip kesici takımlar ile işlenmesi sırasında, işleme parametrelerinin esas kesme ve ilerleme kuvvetlerine olan etkileri incelenmiştir. İşlenebilirlik çalışmaları, CNC torna tezgahında gerçekleştirilmiş olup, dörder farklı kesme hızı, ilerleme oranı ve kesme derinliği işleme parametreleri olarak belirlenmiştir. Kesici takım olarak aynı geometriye sahip, PVD ve CVD kaplamalı takımlar kullanılmıştır. Deneylerin uygulanması için seçilmiş değişkenlere Taguchi L16 ortogonal dizini uygulanarak deney sayısı en aza indirgenmiştir. Elde edilen sonuçların etkili bir biçimde yorumlanması, esas kesme ve ilerleme kuvvetleri açısından en etkin parametrelerin belirlenmesi için varyans analizi (ANOVA) uygulanmıştır. Yapılan deneysel çalışmaların sonucunda 17-4 PH paslanmaz çelikleri için esas kesme ve ilerleme kuvvetleri açısından optimum kesme parametrelerinin tayini gerçekleştirilmiştir. Sonuç olarak, her iki kaplama türünde ilerleme oranı ve kesme derinliği esas kesme ve ilerleme kuvveti değerlerinde artışa neden olmuştur. Kesme hızının artışı ile her iki kaplama türünde de esas kesme kuvveti değerlerinde %8,05 ile %25,24 arasında azalma görülmüştür. Ancak PVD kaplamalı takımlarda artan kesme hızı ile ilerleme kuvveti değerlerinde %0,97 ile %3,18 arasında azalma, CVD kaplamalı takımlarda ise %2,78 ile %7,11 arasında artış olduğu belirlenmiştir.
Stainless steel aged with collapse hardening has superior properties than other types of stainless steel. The most important of these superior properties are mechanical and thermal properties. 17-4 PH stainless steel is preferred in many areas, from the nuclear industry to the aviation industry. In this study, during the processing of 17-4 PH stainless steel with cutting sets with different types of coating, the effects of processing parameters on the main cutting and progress forces were studied. Processability studies have been carried out in the CNC turning factory and have been determined as four different cutting speed, progress rate and cutting depth processing parameters. The cutting equipment has the same geometry, PVD and CVD covered equipment has been used. The number of experiments was minimized by applying the Taguchi L16 ortogonal directory to the chosen variables for the implementation of the experiments. Variance Analysis (ANOVA) has been applied to effectively interpret the achieved results, to determine the most effective parameters in terms of the basic cutting and progress forces. Experimental studies have resulted in the determination of the optimal cutting parameters for 17-4 PH stainless steel in terms of basic cutting and progress forces. As a result, the progress rate and cutting depth in both types of coating have led to an increase in the core cutting and progress strength values. With the increase in the cutting speed, the basic cutting power values in both types of cutting were reduced between 8.5% and 25.24%. However, the increased cutting rate in PVD-covered equipment has been determined by a decrease between 0.97% and 3.18% in advance strength values, while in CVD-covered equipment there is an increase between 2.78% and 7.11%.
Precipitation hardened stainless steels have more superior properties than other stainless steel types. The most important ones of these superior properties are its mechanical and thermal properties. From nuclear industry to aviation industry, 17-4 PH stainless steels are favored in many industries. In this study, during machining of 17-4 PH stainless steel with different coated cutting tools, the effect of cutting parameters on main cutting force and feed force was investigated. Machinability studies were executed on CNC turning machine. Four different cutting speeds, four different feed rates and four different cutting depths were determined as cutting parameters. Geometrically identical PVD and CVD coated cutting tools were used. In order to perform the study, Taguchi L16 orthogonal array were applied to the selected variables for optimizing the number of experiments. Analysis of variance (ANOVA) was applied on behalf of commenting the obtained results influentially and for determining the most effective parameters in terms of main cutting forces and feed forces. As a result of the experimental studies, optimum cutting parameters were determined with regards to main cutting force and feed force. Increasing feed rate and cutting depth increase main cutting force and feed force values during machining with both coating types. Moreover, increasing cutting speed reduces main cutting force values between 8,05% and 25,24% during machining with both coating types. However, it was determined that increasing cutting force decreases the feed force values between 0,97% and 3,18% machining with PVD cutting tools, increases feed force values between 2,78% and 7,11% machining with CVD cutting tools, consequently.
Alan : Fen Bilimleri ve Matematik; Mühendislik
Dergi Türü : Ulusal
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