Three-dimensional elliptical vibration cutting device for space curved beam

Abstract

The invention relates to the technical field of difficult-to-machine material cutting and ultra-precision cutting machining, and particularly discloses a three-dimensional elliptical vibration cuttingdevice for a space curved beam. The three-dimensional elliptical vibration cutting device comprises a base body, a back plate, curved beam flexible units, a micro-motion platform, a clamp, a first piezoelectric ceramic promoter, a second piezoelectric ceramic promoter, a third piezoelectric ceramic promoter and a foundation; and the micro-motion platform is connected with the base body through the four curved beam flexible units, the clamp is arranged on the front surface of the micro-motion platform, the back plate is arranged on the back side of the base body, the base body and the back plate are arranged on the foundation, the first piezoelectric ceramic promoter is vertically arranged, the threaded end of the first piezoelectric ceramic promoter is connected with the base body, the ball end of the first piezoelectric ceramic promoter is connected with the micro-motion platform, the second piezoelectric ceramic promoter is horizontally arranged, the threaded end of the second piezoelectric ceramic promoter is connected to the base body, the ball end of the second piezoelectric ceramic promoter is connected to the micro-motion platform, a third piezoelectric ceramic promoter isarranged horizontally, the threaded end of the third piezoelectric ceramic promoter is connected to the back plate, and the ball end of the third piezoelectric ceramic promoter is connected with the micro-motion platform. The three-dimensional elliptical vibration cutting device solves the problem that in the prior art, an elliptical vibratory cutting device has problems.

Description

technical field [0001] The invention relates to the technical field of cutting difficult-to-machine materials and ultra-precision cutting, in particular to a three-dimensional elliptical vibration cutting device for space curved beams. Background technique [0002] With the rapid development of science and technology, difficult-to-machine materials such as hardened steel and silicon carbide have attracted more and more attention. However, the processing performance of the above-mentioned materials is poor by traditional cutting methods, which will lead to severe diamond tool wear, deterioration of machined surface quality and reduced machining accuracy during the cutting process. In order to solve the above problems and make precision machining more widely used in military, aerospace and civilian industries, academic researchers have proposed a series of solutions, such as low temperature cutting, carbon saturation cutting and elliptical vibration cutting. Among them, ellip...

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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 cutting device are: the nonlinear superharmonic resonance of the cutter bar is coupled in the transverse bending vibration and longitudinal vibration, which is prone to crosstalk; The fixed vibration shape of the cutter bar is adjustable, and it is difficult to adapt to the processing requirements of different materials; the node of the tool bar clamping is obtained by analyzing the mode shape, and the design of the tool bar is relatively difficult, and deviations may occur in actual processing, affecting Precision

The main disadvantages of the non-resonant three-dimensional vibration cutting device are: the position of the piezoelectric ceramic auxiliary cutting device is fixed, so the plane where the elliptical motion trajectory is formed cannot be adjusted as required; the vibration of the device is realized by the cooperation of multiple kinematic pairs, which requires Assembly and has high precision requirements for each part; the volume is large, the processing is time-consuming and material-consuming, and the installation is difficult; the elliptical motion trajectory during actual cutting is affected by various factors, and deformation or deformation will inevitably occur under open-loop control. Distortion; most of the designed devices use straight beam compliant units, resulting in too low a first-order natural frequency and a small frequency range for driving signals

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