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• W200469718 abstract "Titanium and its alloys have found wide application in the aerospace, biomedical andautomotive industries owing to their good strength-to-weight ratio and high corrosionresistance. However, these alloys have very poor machinability, which is attributed to theirinherent high strength maintained at elevated temperature and low thermal conductivity. Highchemical reactivity of titanium at high elevated temperatures, especially with titanium basedtools or coatings limit their application during machining. The strategy of titanium machiningis to use tools which show less reactivity, has higher thermal conductivity to increase thechip-tool contact length and effectively take away the generated heat and to use tougher andharder tools which could withstand the dynamic action of the cutting force. Therecommended tools for many years had been the uncoated tungsten carbide grade K.However, modern trend is to use Poly Crystalline Diamond (PCD) tools for machining of thisparticular alloy. In this work the effectiveness of PCD has been compared to that of uncoatedtungsten carbide tool in machining titanium alloy Ti-6Al-4V. The comparison has been madein terms of the applicable cutting speed ranges, tool wear rates, tool wear morphology, chipsegmentation and chip-tool contact lengths.Titanium and its alloys have been experiencing extensive development over the past fewdecades stimulated by a series of their unique properties, such as, high strength to weightratio maintained at elevated temperatures, high fracture resistance and exceptional resistanceto corrosion at temperatures below 500 0C. Though the initial applications of Titanium alloyshave been in the aerospace industries in aero-engine and airframe manufacture, there is agrowing trend in their application in the industrial sector, which includes petroleum refining,chemical and food processing, surgical implantation, nuclear waste storage, automotive andmarine applications. Despite the increased usage and production of titanium and its alloys,these materials fall under the category of the most difficult to machine materials which isattributed to their inherent high strength property maintained at elevated temperature and alsotheir tendency to form localized shear bands during machining [1, 2]. Apart from that thethermal conductivity of Ti–6Al–4V alloy (7 Wm−1 K−1) is very low (86% lower) comparedto that of AISI 1045 steel (50 Wm−1 K−1) [1]. The heat affected zone is also very small as a result of the shorter chip-tool contact length (about 1/3 that of the contact length for steel) [1,3, 5]. As a result high cutting temperatures are generated during machining of titanium alloysand the hottest point is brought close to the cutting edge. The temperature zone of 700 0Ccomes as close as 0.1 mm from the cutting edge. On the other hand, the stresses acting on thetool are dynamic in nature due to the formation of chips with serrated teeth in the entire cuttingspeed range [4-5]. The other reason for poor performance of the tool is the chemicalreactivity of titanium [6-8]. Attempts to describe the chip morphology in cutting titanium andits alloys date back to the work performed by Cook in 1953 [9]. Straight tungsten carbide(WC/Co) tools are reported to have superiority in performance in machining Ti alloys ininterrupted cutting [10,11]. Shuting and Wenjieapplied High-Speed Machining of TitaniumAlloys using the Driven Rotary Tool and found reported high tool life [12]. Modern trend ofmachining is using PCD or Poly Crystalline Cubic Boron Nitride (PCBN) tools [2].It may be concluded from these works that uncoated cemented carbide and the PCD are themost suitable cutting tool materials for titanium machining. Comparison of the performanceof these two materials and the basic mechanism of their improved performance from theperspective of chip formation instability, contact length and the tool strength in withstandingmechanical failure and chemical action needs to be performed." @default.
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• W200469718 date "2011-01-01" @default.
• W200469718 modified "2023-09-23" @default.
• W200469718 title "Some aspects of improved machinability in preheated machining of Titanium alloy Ti-6Al-4V" @default.
• W200469718 hasPublicationYear "2011" @default.
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