Ultrasonic back-mounted two-way vibration turning method

Abstract

The invention relates to an ultrasonic postpositional double-direction vibration turning method which comprises the following steps of: acting one ends of two amplitude change poles on the rear part of a turning tool extending out of a tool rest used for arranging the turning tool up and down, wherein the two amplitude change poles are only contacted with a tool pole of the turning tool but not fastened and connected; respectively connecting the other ends of the two amplitude change poles with a transducer, and respectively and electrically connecting the two transducers with an ultrasonic generator; respectively applying pressure to the two amplitude change poles, wherein in a turning process, the amplitude change poles are contacted with the tool pole of the turning tool all the time through the pressure; starting the two ultrasonic generators to ensure that electric vibration signals are converted into ultrasonic mechanical vibration by the transducers; amplifying the ultrasonic mechanical vibration of the transducers by the amplitude change poles and then transmitting the ultrasonic mechanical vibration to the turning tool to ensure that the difference of the vibration phases of the two amplitude change poles is 180 degrees; and alternately generating vibration to the tool pole of the turning tool by the up and down amplitude change poles to realize the ultrasonic turning of a workpiece. According to the ultrasonic postpositional double-direction vibration turning method, the phenomenon of unstable vibration or no vibration is avoided, and the effect of ultrasonic vibration turning is guaranteed.

Description

technical field [0001] The invention relates to a method for performing ultrasonic turning on a workpiece on a lathe, and belongs to the technical field of ultrasonic turning. Background technique [0002] Ultrasonic vibration turning refers to the turning of the turning tool along the cutting direction at the vibration frequency and small amplitude of the ultrasonic range of vibration frequency f=16-50KHz and amplitude a=10-25μm. Utilizing this kind of vibration cutting, ultra-precision machining can be realized on ordinary lathes, that is, roundness, cylindricity, flatness, parallelism, and straightness can all be close to zero error, and lathes can be used instead of grinding. The application of ultrasonic turning has the following advantages: 1. Reduced cutting force: Vibratory turning is a kind of pulse cutting from a microscopic point of view. The effective cutting time of the tool in one vibration cycle is extremely short, and most of the time in one vibration cycle....

AI Technical Summary

Problems solved by technology

[0006] The above existing ultrasonic vibration turning methods all fixedly connect the horn and the turning tool bar (or turning tool) as a whole. The problem with this method is that when the turning parameters (such as linear speed, cutting depth, When the amount of feeding, etc.) changes, the load characteristics of turning will change, and the change of this load will directly affect the stability of ultrasonic energy output, and the instability of ultrasonic energy output will directly affect the vibration of turning tool and affect the quality of turning; even , when the load is large, the cutting force on the turning tool is large or the load changes greatly, the tip of the turning tool will not vibrate, and the effect of ultrasonic vibration will not be achieved when turning the workpiece

In addition, because the impact of the horn is periodic, when only one horn is set to impact and vibrate the turning tool, the horn can only realize the half-wave impact vibration of the turning tool, and cannot keep the turning tool with a large amplitude all the time. vibration

This is also the essential reason why ultrasonic vibration turning has no industrial application so far.

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