Experimental investigation on Ultrasonic Assisted Drilling (UAD)

The goal of this research is to research how ultrasound-assisted drilling (UAD) can improve performance in oiler drilling. Supporting literature, the physics of the method is a reduction in both heat generation within the drilling gap (space between drilling bit and rock formation) and weight on bit (WOB) by reducing the friction. Hence, some theoretical analysis and experimental tests are administered to present the phenomenon of reduction in friction coefficient between two materials when ultrasound is employed. Friction tests are performed in another area of application different from drilling. The results show that using ultrasound caused dramatically reduction in both the normal and horizontal transporting loads of the silicon wafers. Around, 5 and 20 times decreasing vertically and horizontally forces, respectively, was observed when 10 W ultrasonic power was applied. In the second step, the influence of ultrasonic was investigated within the milling process. Experimental results prove that the quantity of machining forces in ultrasonic-assisted milling (UAM) is a smaller amount than in conventional milling (CM). It is observed that the decreasing of milling force in UAM to CM process is approximately 6% and 19% for a=8 and 20 mu m at N=800 r/min, respectively. In the third step, the effect of using ultrasound-assisted vibrations when drilling during a sample of rock at ambient conditions was investigated. Vibrations are transferred to the drilling tool directly, and the drilling tool rotates and vibrates longitudinally at an equivalent time. The drilling force reduction was observed to be approximately between 7.8 and 10.6 times counting on the amplitude of the vibrations.

Automated summary

This research investigates the potential application of ultrasound-assisted drilling in reducing friction force and improving drilling efficiency through theoretical analysis and experimental tests. The results show a significant reduction in the coefficient of friction on silicon wafers and in machining forces during ultrasonic-assisted milling. Additionally, experiments on drilling rock samples demonstrate a substantial decrease in drilling force with the use of ultrasound-assisted vibrations.