Investigation and Optimization of NPT Taper Threading Operations on St37-2 / S235JR, 11SMnPb37 and C45 (1.0503) Steels on CNC Lathes

Abstract

In this study, NPT taper threading was performed on materials with different hardness (St37-2/S235JR, 11SMnPb37 and C45(1.0503)) and the effects of machining parameters on the main cutting force (Fc) and rake (α) were experimentally investigated. Four different cutting speeds (50, 60, 70 and 80 m/min), 1.411 mm/rev pitch and two different coated cutting tools (ALCrN+ ALCrSIN, TİALN) coated by PVD method were used in the experiments. The depth of cut was taken as constant 1.015 mm in all experiments. Analysis of variance (ANOVA) was performed to determine the effective parameters on the experimental results and the optimum machining parameters were determined by response surface methodology (RSM). According to the ANOVA results, it was found that the material hardness had the greatest effect on Fc and α values. It was concluded that the optimum values will be obtained when 11SMnPb37 material is machined at a cutting speed of 63.6364 m/min using TİALN PVD coated tool.

Keywords

• NPT Tapered
• Thread
• ANOVA
• RSM

CNC Torna Tezgâhlarında St37-2 / S235JR, 11SMnPb37 ve C45 (1.0503) Çeliklerine NPT Konik Diş Açma İşlemlerinin İncelenmesi Ve Optimizasyonu

Öz

Bu çalışmada, farklı sertliğe sahip malzemeler (St37-2/S235JR, 11SMnPb37 ve C45(1.0503)) üzerine NPT konik diş açma işlemi uygulanmış ve işleme parametrelerinin esas kesme kuvveti (Fc) ve eğim (α) üzerine etkileri deneysel olarak araştırılmıştır. Deneylerde dört farklı kesme hızı (50, 60, 70 ve 80 m/dak), 1,411 mm/dev adım ve PVD yöntemi ile kaplanmış iki farklı kaplamalı kesici takım (ALCrN+ ALCrSİN, TİALN) kullanılmıştır. Kesme derinliği ise tüm deneylerde sabit 1,015 mm alınmıştır. Deney sonuçları üzerinde etkin parametrelerin belirlenmesi için varyans analizi (ANOVA) yapılarak, yanıt yüzeyi metodolojisi (RSM) yöntemiyle optimum işleme parametreleri tespit edilmiştir. ANOVA sonuçlarına göre Fc ve α değerleri üzerinde en büyük etkiye malzeme sertliğinin sahip olduğu tespit edilmiştir. Optimum değerlerin 11SMnPb37 malzemenin TİALN PVD kaplamalı takım kullanılarak 63,6364 m/dak kesme hızında işlendiğinde elde edileceği sonucuna ulaşılmıştır.

Anahtar Kelimeler

• NPT konik diş
• ANOVA
• RSM

Kaynakça

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