Dual-excitation ultrasonic elliptical vibration cutting device in direction perpendicular to cutter rod

Abstract

The invention provides a dual-excitation ultrasonic elliptical vibration cutting device in a direction perpendicular to a cutter rod. The device is composed of a longitudinal vibration ultrasonic vibrator A, a longitudinal vibration ultrasonic vibrator B and a bending vibration amplitude-change rod. The longitudinal vibration ultrasonic vibrator A and the longitudinal vibration ultrasonic vibratorB are both fixed to the bending vibration amplitude-change rod, and each comprise a rear cover plate, an electrode piece, ring-shaped piezoelectric ceramics and a front cover plate which are connected through pre-tightening bolts, and a first pre-tightening bolt of the longitudinal vibration ultrasonic vibrator A is perpendicular to a second pre-tightening bolt of the longitudinal vibration ultrasonic vibrator B. The two longitudinal vibration ultrasonic vibrators are arranged in the radial direction of the bending vibration amplitude-change rod, through two phases of ultrasonic excitation signals with a certain phase difference, the dual-bending vibration mode of the bending vibration amplitude-change rod can be excited, and the elliptical vibration track can be output on a cutter.

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 along the direction perpendicular to the cutter bar. Background technique [0002] Ultrasonic elliptical vibration cutting is a cutting method in which two-dimensional ultrasonic vibration is applied to the tool to make it present an "elliptical motion trajectory". Compared with one-dimensional ultrasonic vibration cutting, its cutting process has "friction force reversal" and "variable angle cutting". , and more thorough "knife-worker complete separation" characteristics, which have the advantages of extending tool life, improving surface finish and shape accuracy, improving cutting stability, and suppressing burrs and regenerative chatter, so they are widely used in hard, brittle and difficult-to-machine materials. Precision ultra-precision cutting. [0003] In order to realize the "complet...

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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 increase of the frequency and amplitude of the device; 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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