Bu çalışmada, kaplamasız ve TiB2 kaplamalı kesici takımlar ile AA6061 alaşımının tornalanmasında yüzey pürüzlülüğü üzerinde kesme parametrelerinin etkileri deneysel olarak araştırıldı. İşleme deneyleri CNC torna tezgâhında soğutma sıvısı kullanılmadan gerçekleştirilmiştir. İşleme deneyleri kesici takım kaplaması ve kesme parametrelerinin farklı düzeylerinde Taguchi L18 (2 1 x3 3 ) dizinine göre tasarlanmıştır. İşleme deneyleri sonucunda elde edilen veriler istatiksel olarak analiz edilmiştir. En iyi işlenmiş yüzey pürüzlülüğü için optimum kesme parametrelerinin seviyeleri belirlenmiştir. Varyans analiz sonuçlarına göre ilerleme miktarı % 64.28 katkı oranı ile yüzey pürüzlülüğünü etkileyen en etkin faktör olmuştur.
In this study, the effect of cutting parameters on kerf quality and surface roughness in laser cutting of Al 5083 alloyed material was investigated both experimentally and statistically (Taguchi & Gray Taguchi). Experimental design was determined using the Taguchi L[Formula: see text] (21x 3[Formula: see text] orthogonal array. Experiments were carried out by using two different gas pressures (GP) (8 and 10 bar), three different cutting speeds (CS) (3500, 4000 and 4500[Formula: see text]mm[Formula: see text][Formula: see text][Formula: see text]min[Formula: see text] and laser power (P) (2600, 3100 and 3600[Formula: see text]W) in the cutting of Al 5083 alloyed material. As a result of the study, top kerf width (TKW), bottom kerf width (BKW) and average surface roughness (Ra) were measured as output parameter values. Using the measured top and BKW results, kerf taper (KT) was calculated. The lowest values of TKW, BKW, KT and Ra were 2.219[Formula: see text]mm, 2.010[Formula: see text]mm, 0.984∘ and 2.394[Formula: see text][Formula: see text]m, respectively. To determine the optimum values of laser cutting parameters for minimum output parameters, signal-noise (S/N) ratio, variance and regression analysis, validity experiments and GRA methods were used. When S/N ratios were examined, the most ideal cutting parameters were determined as A1B3C1 for TKW and BKW, A2B1C3 for KT and A2B3C3 for Ra. When the variance results were examined, it was determined that the most effective processing parameter for TKW, BKW and KT was at 46.04%, 50.58% and 56.45% CS, respectively, and the most effective processing parameter for Ra was laser power with 46.57%. According to gray relationship analysis, optimum laser cutting parameters for the smallest values of all output parameters were determined as A1B3C1. According to gray relationship analysis, optimum laser cutting parameters for the smallest values of all output parameters were determined as A1B3C1.
In this study, the effect of the microstructure, hardness, and cutting speed on main cutting force and surface roughness in medium carbon microalloyed steel cooled in different mediums after hot forging, was investigated. As-received sample, which was not hot forged, and the samples cooled in the sand, air, oil, and polymerized water after hot forging were used for the experimental studies. The machinability tests were performed via turning method by using coated carbide and coated ceramic cutting tools with five cutting speed (120, 150, 180, 210, and 240 m/min), constant feed rate (0.04 mm/rev), and constant depth of cut (0.6 mm). The microstructure examinations of the samples were carried out and their hardness values were determined. Also, the wear of cutting tools were examined with scanning electron microscope. In the experimental study, it was revealed that the microstructure, hardness and cutting speed had a significant effect on the surface roughness values of the samples cooled in dissimilar environments following forging. Moreover, the samples cooled in air and polymerized water, whose hardness increased depending on the increase in the cooling rate, had the highest cutting force after machining by using the coated carbide and ceramic tool.
This paper presents the Toolox 44 steel’s experimental and statistical machinability optimizations conducted for achieving minimum output parameters (energy consumption ([Formula: see text]), cutting force ([Formula: see text]), surface roughness ([Formula: see text]), and vibration (Vib)). Turning experiments have been performed under dry machining conditions on a CNC lathe at different cutting parameters according to the Taguchi L27 orthogonal array. Taguchi-based gray relational analysis (GRA) has also been used to optimize output parameters simultaneously. Moreover, analysis of variance (ANOVA) has been applied to determine the effects of cutting parameters on output parameters. As a result, the lowest Ec was measured 0.06 kW at the 1.5 mm depth of cut, 220 m/min cutting speed and 0.4 mm/rev feed rate. At 0.5[Formula: see text]mm depth of cut, 220[Formula: see text]m/min cutting speed and 0.1[Formula: see text]mm/rev feed rate, the lowest [Formula: see text], [Formula: see text] and Vib are measured at 132.28[Formula: see text]N, 0.69[Formula: see text][Formula: see text]m and 2.25[Formula: see text]m/s2, respectively. According to GRA, the best machining combination in terms of energy consumption ([Formula: see text]), cutting force ([Formula: see text]), surface roughness ([Formula: see text]), and vibration (Vib) was A1B3C1, and the percentage of improvement in the gray relational degree has been calculated to be 25.25%. Validation test results showed that the optimization of cutting parameters was successful in the machining process of Toolox 44 steel according to the multiple output parameter values.
Bu makaleye şu şekilde atıfta bulunabilirsiniz(To cite to this article): Özlü B., Demir H. ve Türkmen M., "The effect of mechanical properties and the cutting parameters on machinability of AISI 5140 steel cooled at high cooling rates after hot forging",
Processing with turning method of sleipner cold work tool steel Investigation of the effects of cutting parameters on cutting force components Determination of optimal cutting parameters for minimum cutting force and surface roughness and examination of formed chip shapes Sleipner cold work tool steel has high abrasion and compression strength, high toughness, high dimensional stability during heat treatment, weldability and easy machinability. Sleipner steel is widely used in plastic injection and sheet metal molds, in manufacturing of plastic and punching blades. In addition, the fact that it is suitable for surface coating techniques such as TiN, CrN by PVD method has led to its widespread use in industrial applications. Due to the high surface quality and dimensional stability required in the mold industry, critical machining operations are preferred. The demand for high surface quality and dimensional stability after machining it is important to predetermine cutting parameters. Since high surface quality and dimensional stability are desired after machining, it is necessary to determine the cutting parameters in advance. It is therefore important to determine machining parameters such as appropriate cutting speed, feed rate and cutting tool geometry. Figure A. Variation of main cutting force and surface roughness depending on cutting speed and feed ratePurpose: In this study, Sleipner cold work tool steel was turned using different cutting parameters. The effects of cutting parameters on cutting force components and main cutting force, chip shapes and surface roughness were investigated experimentally. Theory and Methods:A KISTLER 9257B type piezoelectric dynamometer, which can measure the cutting force components at the same time, was used for the measurement of the cutting forces in the turning experiments. Signals from the dynamometer were transmitted with the KISTLER 5070A multichannel amplifier. Measured cutting force components were converted to numerical values with DynoWare software. At the end of the turning tests, the roughness values of the machined surfaces were measured with Mahr Perthometer M1. The abrasion of the cutting tool was examined by scanning electron microscope (SEM). The insize ISM-PM200SB digital microscope was used for the examination of chip shapes. Results:Cutting force components increased with increasing amount of feed rate and cutting force components decreased with increasing cutting speed. The lowest cutting force was obtained at 359,6 N in 100 m/min cutting speed and 0,1 mm/rev feed rate. The highest cutting force was measured at 921,3 N in 50 m/min cutting speed and 0,3 mm/rev feed rate. Among the machined surfaces the lowest surface roughness was obtained as 0.97 µm at 150 m/min cutting speed and 0.1 feed rate. The highest surface roughness was found to be 5.12 µm at 50 m/min cutting speed and 0.3 mm/rev feed rate. In the parameters in which the lowest cutting force and surface roughness were measured, chip shapes were similar to spiral type chip shape. Conclusion:In ...
Bu çalışmada, Hardox 450 çeliğinin lazerle delme işleminde kesme parametrelerinin (odak noktası, kesme hızı, gaz basıncı ve lazer gücü) yüzey pürüzlülüğü ile üst ve alt delik dairesellik toleransı üzerine etkisi incelenmiştir. Lazer kesme işlemi için deney tasarımı, Taguchi L 18 ortogonal dizinine göre yapılmıştır. Deneylerde kesme parametreleri olarak; iki farklı odak noktası, üç farklı gaz basıncı, üç farklı kesme hızı ve üç farklı lazer gücü seçilmiştir. Taguchi yöntemine göre lazer delme işleminde kullanılan kesme parametreleri optimize edildi. Ayrıca kesme parametrelerinin yüzey pürüzlülüğü ile üst ve alt delik dairesellik toleransı üzerine etkilerinin belirlenmesi için varyans (ANOVA) analizi yapılmıştır. Sonuç olarak; Hardox 450 çeliğinin delinmesinde kesme hızının ve lazer gücünün artması yüzey pürüzlülüğünün azalmasına neden olurken gaz basıncının ve odak noktasının artması yüzey pürüzlülüğünün artmasına neden olmuştur. Gaz basıncı, kesme hızı ve lazer gücünün artması ile üst ve alt delik dairesellik toleransı artarken, odak noktasının azalması üst ve alt delik dairesellik toleransının azalmasına neden olmuştur. En düşük yüzey pürüzlülüğü 0,718 µm için optimum kesme parametreleri -1 mm odak noktası, 0,7 bar gaz basıncı, 1500 mm/sn kesme hızı ve 2600 W lazer gücü olarak belirlenmiştir. Üst ve alt delik için sırası ile en küçük boyutsal tamlık 20,069 mm ve 20,024 mm için optimum kesme parametreleri -1 mm odak noktası, 0,7 bar gaz basıncı, 1100 mm/sn kesme hızı ve 2200 W lazer gücü olmuştur. Varyans analizi sonucu yüzey pürüzlülüğü ile üst ve alt delik dairesellik toleransı için sırası ile en etkin parametre %77,17 %51,40 ve %71,80 ile gaz basıncı olmuştur.
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