Investigation on performance characteristics in drilling of Ti6Al4V alloy

Zhu, Zhaoju; Sui, Shaochun; Sun, Jie; Li, Jianfeng; Li, Yanle

doi:10.1007/s00170-017-0508-6

Cited by 59 publications

(20 citation statements)

References 22 publications

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“…Oversized holes are often obtained in dry cutting owing to the thermal expansion resulting from the high cutting temperatures. The influences of feed and cutting speed variation on hole diameter are complicated to study owing to their interacting effects [18]. Elastic recovery of compressive strain produced by thrust force may decrease the hole size.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Influence of Wire Arc Additive Manufacturing on the Machinability of Titanium Parts

Alonso

Veiga

Suárez

et al. 2019

Metals

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The manufacturing of titanium airframe parts involves significant machining and low buy-to-fly ratios. Production costs could be greatly reduced by the combination of an additive manufacturing (AM) process followed by a finishing machining operation. Among the different AM alternatives, wire arc additive manufacturing (WAAM) offers deposition rates of kg/h and could be the key for the production of parts of several meters economically. In this study, the influence of the manufacturing process of Ti6Al4V alloy on both its material properties and machinability is investigated. First, the mechanical properties of a workpiece obtained by WAAM were compared to those in a conventional laminated plate. Then, drilling tests were carried out in both materials. The results showed that WAAM leads to a higher hardness than laminated Ti6Al4V and satisfies the requirements of the standard in terms of mechanical properties. As a consequence, higher cutting forces, shorter chips, and lower burr height were observed for the workpieces produced by AM. Furthermore, a metallographic analysis of the chip cross-sectional area also showed that a serrated chip formation is also present during drilling of Ti6Al4V produced by WAAM. The gathered information can be used to improve the competitiveness of the manufacturing of aircraft structures in terms of production time and cost.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Influence of Wire Arc Additive Manufacturing on the Machinability of Titanium Parts

Alonso

Veiga

Suárez

et al. 2019

Metals

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“…Even though, the temperature is not increase significantly with increase distance from drilled-hole edge. In other words, because of low thermal conductivity of Ti-6Al-4V (k = 7.3 W/mK), i.e., almost three times lower than stainless steel 304 (k = 21 W/mK), heating phase takes longer time (Lee et al 2009;Zhu et al 2017). Therefore, the higher increase temperature, the longer cooling time.…”

Section: Resultsmentioning

confidence: 99%

Experimental investigation on friction drilling of titanium alloy

Dehghan¹,

Ismail²,

Ariffin³

et al. 2018

10.5267/j.esm

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Friction drilling is a green hole-making process that zealously utilizes the heat generated from the friction between the rotating conical tool and workpiece to create a bushing without generating chip. The difficult-to-machine materials with unique metallurgical properties have been developed to meet the demands of extreme applications. However, the major challenges of friction drilling on difficult-to-machine materials are the hole diameter accuracy, petal formation and tool wear. In this study, the effects of process parameters such as spindle speed and feed rate on bushing height and shape, hardness and tool wear in friction drilling of titanium alloy Ti-6Al-4V were experimentally investigated using tungsten carbide tool. Optical photographs have also been analyzed for better understanding of the chipless friction drilling process for different parametric settings. Experimental results indicated that the spindle speed has great influences for achieving better bushing formation and prolong the tool life. It was confirmed that the low spindle speed and low feed rate have great influences for achieving better bushing shape and height, prolong tool life and lower hardness that located adjacent to the hole wall. It also was discovered that the low thermal conductivity of Ti-6Al-4V caused to improper increment of frictional heat and surface temperature. This disadvantage leads to unsatisfactory bushing formation. This work demonstrated the performances of chipless friction drilling used on difficult-to-machine material that can offer a great prospective for a new product design and manufacturing.

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“…It accounts for 40% of all the material removal processes [2]. Ti6Al4V is widely used in aerospace, automotive, biomedical engineering, bone transplantation and chemical industry [3] for bone replenishment and low elastic modulus [4,5] due to its high strength to weight ratio, low density, corrosion resistance, wear resistance and other good mechanical properties. Although the surface of Ti6Al4V has good workability from the viewpoint of cutting force, its inherent characteristics, especially low thermal conductivity, relatively low modulus of elasticity, high temperature strength, high chemical activity and small deformation coefficient [6][7][8], lead to Ti6Al4V difficult to process and often require relatively long processing times and expensive tools [9].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of different tool geometries in the finite element simulation of ultrasonic-assisted drilling of Ti6A14V

Wang

2020

J Braz. Soc. Mech. Sci. Eng.

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This paper attempts to analyze the effect of various drilling parameters such as feed rate, spindle speed and vibration frequency on performance characteristics such as thrust force, effective stresses, temperature and chip morphology in conventional drilling (CD) and ultrasonic-assisted drilling (UAD) of Ti6A14V using three different point angle (140°, 120°, 90°) drill bits in order to optimize the chip breakability of Ti6A14V. The three different point angle drill bits are utilized to establish the finite element models (FEM) to simulate the drilling process with Lagrangian approach in DEFORM-3D software. The simulations are validated by the experimental findings and analytical data of thrust forces, and the percent errors in results range approximately between 3 and 7%. The results obtained prove that UAD can produce segmental discontinuous chip, lower thrust force, lower process temperature and lower effective stress. The point angle of 120° drill achieved the thinnest chip thickness and the excellent effects of chip breaking. The achieved results are assumed to help for the optimization of the drill tool geometries, drilling parameters and chip breakability.

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Investigation on performance characteristics in drilling of Ti6Al4V alloy

Cited by 59 publications

References 22 publications

Experimental Investigation of the Influence of Wire Arc Additive Manufacturing on the Machinability of Titanium Parts

Experimental Investigation of the Influence of Wire Arc Additive Manufacturing on the Machinability of Titanium Parts

Experimental investigation on friction drilling of titanium alloy

Evaluation of different tool geometries in the finite element simulation of ultrasonic-assisted drilling of Ti6A14V

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