A dual-excitation ultrasonic elliptical vibration cutting device

Abstract

The invention provides a dual-excitation ultrasonic elliptical vibration cutting device. It includes a longitudinal vibration ultrasonic vibrator and a bending ultrasonic vibrator. The longitudinal vibration ultrasonic vibrator includes a first pre-tightening bolt and a longitudinal vibration rear cover, piezoelectric ceramics, electrode sheets, and a longitudinal vibration front cover. The bending ultrasonic vibrator includes The second pre-tightening bolt and the bending vibration rear cover, piezoelectric ceramics, electrode sheet, and bending vibration front cover that are sleeved on it, the tool is connected to the bending vibration front cover, and the first pre-tightening bolt is connected to the bending vibration on the back cover. Through the excitation of the longitudinal vibration ultrasonic vibrator in the radial direction of the device and the bending ultrasonic vibrator in the axial direction of the device with a certain phase difference, the device presents a double bending vibration mode, thereby outputting an elliptical vibration track on the tool. The invention has remarkable effects in high-integrity machining of hard, brittle and difficult-to-machine materials, can significantly reduce tool wear, suppress machining chatter, reduce pits and microcracks on the machined surface, and reduce surface roughness of workpieces.

Description

technical field [0001] The invention relates to the technical field of ultrasonic vibration machining, in particular to a dual-excitation ultrasonic elliptical vibration cutting device. Background technique [0002] Ultrasonic elliptical vibration cutting technology has the characteristics of complete separation of workpiece and tool, and can also realize the characteristics of "friction force reversal" and "variable angle cutting" in the cutting process, thereby effectively reducing cutting force and cutting heat, and significantly reducing tool cutting. Wear, reduce pits and microcracks on the machined surface, and reduce the surface roughness of the workpiece, so it is widely used in precision ultra-precision cutting of hard, brittle and difficult-to-machine materials. [0003] In order to realize the "completely separated cutting" in ultrasonic elliptical vibration cutting and maximize the advantages of ultrasonic elliptical vibration cutting technology, the vibration sp...

AI Technical Summary

Problems solved by technology

[0004] Most of the existing ultrasonic elliptical vibration cutting devices adopt the d31 working mode of piezoelectric ceramics. The tensile strength of the ceramics and the shear strength of the adhesive layer limit the improvement of the device frequency and amplitude; and most of the ultrasonic elliptical vibration cutting devices are composed of longitudinal Vibration, torsional vibration, bending vibration and radial vibration are coupled by two forms of vibration. The coupling efficiency of multi-phase vibration is low, which further limits the increase of frequency and amplitude, resulting in low cutting efficiency.

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