Ultrasonic elliptical vibration cutting device in longitudinal-flexural composite vibration mode

Abstract

The invention provides an ultrasonic elliptical vibration cutting device in a longitudinal-flexural composite vibration mode. The device is formed by combining two longitudinal vibration ultrasonic vibrators and comprises a pre-tightening bolt, a longitudinal vibration rear cover plate, annular piezoelectric ceramics, an electrode plate, a longitudinal vibration front cover plate, a cutter and the like. The first longitudinal vibration ultrasonic vibrator is arranged in the radial direction of the second longitudinal ultrasonic vibrator and used for exciting flexural ultrasonic vibration of the device, and the first longitudinal vibration ultrasonic vibrator and longitudinal ultrasonic vibration excited by the second longitudinal ultrasonic vibrator enable the device to present an ultrasonic longitudinal-flexural composite vibration mode together, so that an elliptical vibration track is output on the cutter installed at the tail end of the device. The device is remarkable in effect in high-integrity machining of hard and brittle materials difficult to machine, cutting force and cutting heat can be effectively reduced, the shape precision of a workpiece is improved, cutter abrasion is remarkably reduced, and plasticity removal of the brittle materials is achieved.

Description

technical field [0001] The invention relates to the technical field of ultrasonic vibration machining, in particular to an ultrasonic elliptical vibration cutting device in a longitudinal-bending composite vibration mode. 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". It was proposed by Japanese scholars Eiji Shamoto and Toshimichi Mori. Compared with one-dimensional ultrasonic vibration cutting, its cutting process has the characteristics of "friction reversal", "variable angle cutting", and more thorough "knife-worker complete separation", which can prolong tool life, improve surface finish and shape accuracy, The advantages of improving cutting stability and suppressing burrs and regenerative chatter have a wide range of applications in ultra-precision cutting of difficult-to-machine materials. [0003] In o...

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Problems solved by technology

[0004] Most of the existing ultrasonic elliptical vibration cutting devices are coupled by two vibration forms of longitudinal vibration, torsional vibration, bending vibration and radial vibration, and the bending vibration is mostly excited by semi-circular piezoelectricity. Its manufacturing process and The assembly accuracy is not high, resulting in a low electro-acoustic conversion rate of piezoelectric ceramics, resulting in serious heating of the device, which limits the application of ultrasonic elliptical vibration cutting technology

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