Dual-excitation ultrasonic elliptical vibration-cutting device

Abstract

The invention provides a dual-excitation ultrasonic elliptical vibration-cutting device. The dual-excitation ultrasonic elliptical vibration-cutting device comprises a longitudinal vibration ultrasonic vibrator and a bent ultrasonic vibrator, wherein the longitudinal vibration ultrasonic vibrator comprises a first pre-tightening bolt and a longitudinal vibration rear cover plate, piezoelectric ceramic, an electrode slice and a longitudinal vibration front cover plate which sleeve the first pre-tightening bolt; the bent ultrasonic vibrator comprises a second pre-tightening bolt as well as a bent vibration rear cover plate, piezoelectric ceramic, an electrode slice and a bent vibration front cover plate which sleeve the second pre-tightening bolt, wherein a tool is connected onto the bent vibration front cover plate; and the first pre-tightening bolt is connected onto the bent vibration rear cover plate. Through the longitudinal vibration ultrasonic vibrator, two phases, in the radial direction of the device, of the longitudinal vibration ultrasonic vibrator, and in the axial direction of the device, of the bent ultrasonic vibrator have excitation of certain phase difference, so thatthe device has a dual-bent-vibration mode, and therefore, an elliptical vibration track is output on the tool. The dual-excitation ultrasonic elliptical vibration-cutting device is remarkable in effect in high-integrity processing of a crisp and hard difficult-to-process material, can remarkably reduce tool abrasion, restrains processing flutter, reduces concave pits and micro cracks of the processing surface, and reduces workpiece surface roughness.

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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