Takma uçlu matkaplar, delik delme operasyonlarında yaygın kullanılan kesici takımlardır. Piyasada, çok farklı tip ve özellikte olan takma uçlu matkaplar bulunmaktadır. Arzu edilen delik kalitesinin elde edilmesinde, uygun bir takma uçlu matkabın ve doğru kesme parametrelerin belirlenmesi gerekmektedir. Bu hazırlıklar için bir uzmana ihtiyaç duyulmaktadır. Bundan dolayı, en uygun kesici takımı ve kesme parametrelerini otomatik belirleyen, Expert for Insert Drilling Tool (EIDT) olarak adlandırılan, bir uzman sistem geliştirilmiştir. EIDT'nin geliştirilmesinde KAPPA-PC uzman sistem paket programı kullanılmıştır. Sistemin tasarımında 150'den fazla kural oluşturulmuştur. Kurallar, ISO normlarına göre hazırlanmıştır. EIDT programı delik çapı ve boyu, tolerans aralıkları, işlenecek malzeme özellikleri, delik türü ve operasyon tipi, vb. gibi veriler kullanılarak en uygun kesici takım önermektedir. Yapılan bu çalışma ile delik delme operasyonlarında uzman olmayan bir kişinin takma uçlu matkapları ve kesme parametrelerini, kolay, hızlı ve doğru bir şekilde seçebilmesi sağlanmıştır.
AA2024 alüminyum alaşımına uygulanan yaşlandırma yöntemlerinin işlenebilirliğe etkisinin taguchi ve anova ile araştırılması Investgation of effects of the aging methods applied on AA2024 aluminum alloys on machinability with taguchi ond anova Yazar(lar) (Author(s)): Necati YALÇIN, Yunus KAYIR, Sibel ERKALBu makaleye şu şekilde atıfta bulunabilirsiniz (To cite to this article): Yalçın N., Kayır Y. ve Erkal S., "AA2024 alüminyum alaşımına uygulanan yaşlandırma yöntemlerinin işlenebilirliğe etkisinin taguchi ve anova ile araştırılması", Politeknik Dergisi, 20(4): 743-751, (2017). Politeknik Dergisi, 2017; 20 (4) : 743-751 Journal of Polytechnic, 2017; 20 (4) Investgation of Effects of The Aging Methods Applied on Aa2024 Aluminum Alloys on Machinability With Taguchi ond Anova ABSTRACTIn this study, machinability tests were executed. AA2024 aluminum alloy that are used in field of automotive and aero industries widely was preferred material in the experimental works. Effects of aging methods that were applied to AA2024 aluminum alloy on machinability were investigated. Test specimens obtained from T3 and T6 that are used methods for aging of AA20024 aluminum alloy, were machined with various cutting parameters (V: 150 m/min, 200 m/min, 250 m/min; F: 0.1 mm/tooth, 0.2 mm/tooth, 0.4 mm/tooth). The test specimens were machined on a CNC milling machine by using the L18 mixed model of Taguchi. Cutting forces (Fx, Fy, Fz) and surface roughness (Ra) were measured. Analysis of Taguchi and ANOVA were done for the results of test. The results showed that main effect factors of the cutting forces and surface roughness were federate and cutting speed. In addition, it was seen that the aging types caused a little effect on the cutting forces and surface roughness. It was determined that the T3 for cutting forces and T6 for surface roughness were very well.
In this study, machinability of AZ 91D magnesium alloy, which has been widely used in automotive and aircraft industries, was investigated by using HSS and carbide tools at dry cutting conditions. Taguchi's L18 (2**1 3**2) mixed model was used for the experiments. Drilling parameters such as feed rate, spindle speed and cutting tool were optimized according to the multiple responses (diametral error, circularity and surface roughness) by grey relational analysis. The effects of machining parameters and their interactions on the hole diameter, circularity and surface roughness were determined. The analysis of Taguchi and ANOVA indicated that the influence of drill material on the surface roughness of the drilled hole was high, but on the hole diameter and circularity it was low. Furthermore, the results of grey relational analysis revealed that optimal combination of the drilling parameters (0.3 mm/rev feed rate, carbide tool and 3000 rpm spindle speed) can be used to obtain the minimum diametral error, circularity error and surface roughness.
Bu çalışmada CNC torna tezgahında delik delme deneyleri yapılmıştır. Deneylerde GGG40 malzemesi, Ø14 mm TiAlN kaplamalı ve kaplamasız içten soğutmalı karbür matkaplar ile delinmiştir. Deneyler sırasında oluşan, delik delme kuvveti (Fz) ve moment (Mz) bir dinamometre ile sıcaklık ise Ø1 mm K tipi ısıl çift kullanılarak ölçülmüştür. Isıl çifti, karbür matkabın iç soğutma kanallarından geçirilerek kesici ucuna konumlandırılmıştır. Delik delme deneyleri, 3 farklı kesme hızı ve 3 farklı ilerleme kullanılarak yapılmıştır. Elde edilen deney sonuçları, ilerleme artıkça delme kuvveti ve momentin arttığı, kesme hızı arttıkça da delme kuvveti ve momentin azaldığını göstermiştir. Bununla birlikte, sıcaklığın artan ilerleme ile azaldığı, artan kesme hızına bağlı olarak artış gösterdiğini ortaya koymuştur.
Tapping is inherently more complex than other machining processes. The main reason for this complexity is that the chip removal process takes place in a closed environment. For this reason, in order to use the tap tools more efficiently, it is necessary to know the cutting conditions and the stresses that occur in the tool during cutting. In this study, holes of different diameters were drilled in the AISI 1050 material and threaded with M10 taps with three different geometries. Uncoated HSS and TiN coated HSS taps were used in the study. The tapping operations were carried out in dry conditions. The simulation conditions were chosen exactly the same as the experimental conditions. Stresses during tapping were analysed using the Third Wave AdvantEdge program based on the finite element method (FEM). The tapping tools were modelled by reverse engineering method and then imported in the program. In general, the coating applied to the tools positively affected the stresses on the cutting tool. Also, the stresses in tapping tools with helical were lower than in straight tools.
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