Simulation and experimental investigations of ultrasonic-assisted drilling with Micro-PDC bit

Zhang, Congshan; Zhao, Yan; Gao, Ke; Zhang, Cong; Lv, Xiaoshu; Xie, Xu

doi:10.1016/j.geoen.2023.211480

Cited by 9 publications

(2 citation statements)

References 40 publications

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“…Ultrasonic-assisted machining is the process of applying ultrasonic vibrations to cutting tools or workpieces in traditional machining techniques such as turning [ 1 , 2 ], milling [ 3 , 4 , 5 ], drilling [ 6 , 7 ], grinding [ 8 , 9 ], and other methods [ 10 ]. The advantages of this method, including reduced cutting force and tool wear, as well as improved surface quality of machined parts, have been well documented in numerous empirical studies.…”

Section: Introductionmentioning

confidence: 99%

Surface Topography in Cutting-Speed-Direction Ultrasonic-Assisted Turning

Nguyen,

Vu,

Nguyen

2024

Micromachines

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Ultrasonic vibration has been employed to assist in turning, introducing intermittent machining to reduce average cutting force, minimize tool wear, and enhance machining efficiency, thereby improving surface roughness. However, achieving intermittent cutting necessitates specific conditions, with a cutting speed or feed rate falling below the critical speed associated with the ultrasonic vibration parameters. This study presents a theoretical model for surface formation in cutting-speed-direction ultrasonic-assisted turning (CUAT), covering both continuous and intermittent machining regimes. Experimental validation was conducted on C45 carbon steel and 201 stainless steel to demonstrate the applicability of the theoretical model across different materials. Digital microscope analysis revealed 3D topography consistency with the theoretical formula. Surface roughness evaluations were performed for both CUAT and CT (conventional turning) methods. The results indicated a significant reduction in roughness Ra for C45 steel samples machined with CUAT, up to 80% compared to CT at a cutting speed of 20 m/min, while only exhibiting slight fluctuations when turning 201 stainless steel. Detailed analysis and explanation of these phenomena are presented herein.

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Section: Introductionmentioning

confidence: 99%

Surface Topography in Cutting-Speed-Direction Ultrasonic-Assisted Turning

Nguyen,

Vu,

Nguyen

2024

Micromachines

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“…In summary, for rock breaking and vibration reduction of PDC bits, it is proposed at home and abroad to use graphene instead of polycrystalline diamond composite sheets in terms of materials to enhance the impact resistance of the cutters, and to reduce the bit failure caused by vibration by changing the cutting structure of the bit or setting a buffer device in terms of structure [14][15][16][17][18][19][20][21][22][23][24][25][26][27] . In this paper, the idea of local accurate vibration reduction, also known as flexible vibration reduction cutting technology, is proposed.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on PDC single-tooth flexible vibration reduction effect

Haitao,

Zhou,

Jia

et al. 2023

Preprint

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In oil and gas drilling engineering, when PDC bit is drilled into inhomogeneous strata, soft and hard alternating strata, and directional drilling and other complex working conditions, it often encounters frequent impact loads, resulting in abnormal failure accidents, which greatly reduces the performance of the bit. The technical concept of flexible cutting rock breaking is to reduce the stiffness by setting elastic elements, reduce the impact load amplitude suffered in the cutting process to a certain range, and achieve the purpose of extending the service life of the bit. The effects of cutting depth, rake angle and disc spring series combination on the damping effect of flexible damping unit are analyzed through experiments on limestone. The results show that the flexible vibration reduction cutting can effectively reduce the peak cutting load and load fluctuation by 20%~35%. When the flexible tolerance ratio is near 67.6%, the flexible vibration damping effect is the best. The effect of flexible vibration reduction is positively correlated with the combined stiffness of the disc spring and the rake angle. The optimum stiffness combination of the elastic elements is 2 A-type disc springs in series and the optimum rake angle is 15°.

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