This paper establishes the new cutting constant in Dual-Mechanism Global Cutting Constants (DGCC) for ultrasonic vibration-assisted drilling (UVAD) considering the penetration angle and wiping effect. In conventional drilling, the cutting process consists of shearing and ploughing mechanisms, in UVAD the cutting process consists of shearing, ploughing, and wiping mechanisms. The effective rake angle and clearance angle in UVAD vary with the penetration angle. The wiping effect occurs under a negative effective clearance angle. The cutting constants in conventional drilling are adapted to model the new shearing cutting constants and the wiping force in UVAD as a linear function of the penetration angle. Drilling experiments in conventional drilling and UVAD with different uncut chip thickness are performed to identify the cutting constants and model parameters. This model is focused to investigate the cutting constants in the drill lip. These identified cutting coefficients in UVAD predict the cutting and wiping forces at different penetration angles. The established mechanistic force models in conventional drilling and UVAD are validated with the experimental forces with good accuracy.

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