Dynamic impact effect analysis for longitudinalultrasonic vibration drilling of CFRP / titanium alloy laminated plate

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (17) : 47-56.

WANG Dong, JIAO Feng, ZHANG Shijie, LI Yuanxiao

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Abstract

In order to study dynamic impact effect of longitudinal ultrasonic vibration drilling of CFRP/titanium alloy laminated plate,drilling bitwas regarded as an equal diameter elastic straight rodwith one built-in end and another free one, and a tool-workpiece system was simplified as a foundation vibration system excited by ultrasonic vibration to establish the whole system’s dynamicmodel. Drilling tests were used to verify the reliability and practicability of the model.Results showed that the dynamic impact force generated by ultrasonic vibration depends on drilling bit’s geometric parameters andoverhang length, ultrasonic vibration’s frequency and amplitude and mechanicalcharacteristics of processedmaterial,and it is irrelevant to drilling amounts of feed rate per revolution and spindle speed;dynamic impact force amplitude is linearly related to ultrasonic vibration’s amplitude, effects of ultrasonic vibration frequency areweaker;dynamic impact force amplitude has an approximate linear relation with drill bit’s diameter and a non-linear relation with overhang length;dynamic impact force amplitude increaseswith increase in ultrasonic vibration amplitude or bit’s diameter or bit’s overhang length; the actual dynamic impact force is related to processed material’s elastic modulus and stiffness, the higher the elastic modulus and stiffness, the larger the former; the study method and conclusions provide a reference for quantitative analysis of ultrasonic vibration drilling impact effect and applications of ultrasonic vibration drilling technology.

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longitudinal ultrasonic vibration / impact effect / vibration drilling / axial force / CFRP / titanium alloy laminated plate

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WANG Dong, JIAO Feng, ZHANG Shijie, LI Yuanxiao. Dynamic impact effect analysis for longitudinalultrasonic vibration drilling of CFRP / titanium alloy laminated plate[J]. Journal of Vibration and Shock, 2020, 39(17): 47-56

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