Department of Manufacturing Engineering
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Browsing Department of Manufacturing Engineering by Subject "manufacturing engineeering"
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Item ULTRASONIC ASSISTED DRILLING OF PRECIPITATION HARDENED MARTENSITIC STAINLESS STEEL(2023-01-03) ENİS, Metin Berk; KILIÇ, Sadık Engin; LOTFI, Bahram17PH4 Stainless Steel is widely used in sectors such as the nuclear industry, aerospace, and defence industry, thanks to its significant corrosion resistance, high fatigue and tensile strength, toughness, and high hardness. Drilling is one of the most used methods in these sectors and general machining processes, but it reduces the drilling performance considerably due to the high wear resistance, hardness, and thermal conductivity of this material. Ultrasonic Assisted Drilling (UAD) is a hybrid method that makes the metal removal process more accessible by using low amplitude vibrations and high frequency. For the first time, the UAD method was used to increase the efficiency of a drilling operation in 17-PH-4 stainless steel in this study. The experimental design was prepared to compare the conventional drilling (CD) method and UAD, as well as to see the effect of UAD on pecking and direct drilling. The experimental results showed that UAD reduces cutting forces, burr formation at the exit hole, built-up edge (BUE), and continuous chip formation, increases dimensional accuracy, and improves surface quality compared to the conventional drilling method. The test results show that the increase in cutting speed significant effect on the reduction of cutting forces, BUE, surface roughness, and continuous chip formation. When the surface roughness, cutting forces, and burr formation results are examined, the positive effect of UAD is higher in direct drilling than in pecking.