Ultrasonic postpositional unidirectional vibration turning method

Abstract

The invention relates to an ultrasonic postpositional unidirectional vibration turning method. One end of an amplitude transformer acts on a toolbar of a turning tool; the part of the turning tool, on which the amplitude transformer acts, is the rear part of the turning tool extending out of a tool rest for mounting the turning tool; the amplitude transformer is not connected with the toolbar of the turning tool in a fastening manner but is in contact with the toolbar of the turning tool; the other end of the amplitude transformer is connected with a transducer which is electrically connected with an ultrasonic generator; when pressure is applied on the amplitude transformer, the pressure ensures that the amplitude transformer is in contact with the toolbar of the turning tool all the time throughout the turning process; when the ultrasonic generator is switched on, the transducer converts an electric oscillation signal into ultrasonic frequency mechanical vibration; the amplitude transformer amplifies and transmits the ultrasonic frequency mechanical vibration of the transducer to the turning tool; turning parameters have no direct effect on the stable output of ultrasonic energy no matter how the turning parameters vary; the stable output of the ultrasonic energy allows the toolbar of the turning tool to obtain a stable vibration force; and the vibration stabilization of a turning tool nose is ensured, thereby ensuring the effects of ultrasonic vibration turning.

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

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

Images