Three-dimensional oval vibration turning head

Abstract

The invention discloses a three-dimensional oval vibration turning head which comprises a vibration component, a base, a top cover, three piezoelectric ceramics drivers, a fixture and a connecting plate. A micro-positioning platform is arranged in the center of vibration component, the vibration component is connected to a base body through fiver suppling units, the micro-positioning platform has three degrees of freedom which are X rotation, Y rotation and Z moving respectively, and the vibration component is a three-degree-of-freedom suppling mechanism and is an integral component. When the three-dimensional oval vibration turning head works, a turning tool of any type is connected to the micro-positioning platform through the fixture, the micro-positioning platform drives the turning tool to vibrate under the driving of the three piezoelectric ceramics drivers, and moving tracks at the position of a tool point are combined into a three-dimensional oval. Due to the fact that the vibration component is the three-degree-of-freedom suppling mechanism, the vibration component of the turning head does not need to be assembled and positioned, and friction losses and moving gaps are avoided. Due to the fact that the piezoelectric ceramics drivers are used for directly driving the micro-positioning platform, the phase angle, the amplitude and the frequency of the oval motion are made to be more convenient to adjust.

Description

technical field [0001] The invention belongs to the field of difficult-to-machine material cutting and ultra-precision cutting, in particular to a three-dimensional elliptical vibration turning tool holder. Background technique [0002] In traditional cutting methods, the cutting process of turning difficult-to-machine materials often leads to severe tool wear, deterioration of machined surface quality, and reduced machining accuracy. In order to solve these problems and make precision machining more widely used in military, aerospace and civilian industries, researchers have proposed a series of solutions, such as: cryogenic cutting, carbon saturation cutting and vibration cutting. Among them, vibration cutting is the most promising cutting method, which has many advantages such as reducing cutting heat and cutting force, inhibiting tool wear, and improving the quality of machined surfaces. Experiments have confirmed that the workpiece processed by elliptical vibration cut...

AI Technical Summary

Problems solved by technology

[0003] The current elliptical vibration cutting devices mainly include resonance type and non-resonance type. The main disadvantages of the resonance type elliptical vibration device are: (1) The frequency of elliptical motion depends on the nonlinear structural dynamic parameters of the cutter bar. In order to obtain reasonable parameters Need to optimize the tool holder size, reducing the versatility of the device

(2) The drive signal needs to be adjusted repeatedly to make the device resonate, and the tool holder needs to be specially designed, which has poor versatility

(4) The obtained ellipse distortion

[0004] The main disadvantages of the current non-resonant three-dimensional elliptical vibration device are: (1) The vibration of the device is realized by multiple kinematic pairs, which requires assembly and requires high precision for each part

(2) The cooperation of each part will produce friction loss and motion clearance

(3) Huge volume, time-consuming and material-consuming processing, difficult installation

(4) Poor versatility, cannot be applied to multiple types of lathes

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