Ultrasonic vibration device for coaxial ultrasonic-assisted laser shot peening

Abstract

The invention provides an ultrasonic vibration device for coaxial ultrasonic-assisted laser shot peening. The ultrasonic vibration device mainly comprises a vibration rod, an amplitude-change pole, piezoelectric ceramic, first optical glass and second optical glass, wherein through holes are formed in the centers of the vibration rod and the amplitude-change pole in the axial direction; the lowerend of the vibration rod is fixedly connected with the upper end of the amplitude-change pole; the first optical glass is positioned at the top of the vibration rod; the second optical glass is positioned at the bottom of the amplitude-change pole; the upper end of the vibration rod extends out of the upper surface of an upper shell and is fixedly connected with the upper surface of the upper shell; the piezoelectric ceramic is arranged on the vibration rod. According to the ultrasonic vibration device, after the piezoelectric ceramic is electrified, electric energy is converted into mechanical energy to generate ultrasonic waves, and amplification of mechanical vibration amplitude is achieved through the amplitude-change pole. The through holes formed in the centers of the vibration rod and the amplitude-change pole in the axial direction provide a propagation channel for laser, and coaxial propagation of ultrasonic vibration waves and laser shock waves is achieved. Coupling of the ultrasonic vibration waves and the laser shock waves in the propagation process is ensured, the dynamic recrystallization behavior of a material is promoted, and a metal part with an ultrafine grain surface is prepared.

Description

technical field [0001] The patent of the invention belongs to the field of ultrasonic-assisted laser processing, and particularly refers to an ultrasonic vibration device for coaxial ultrasonic-assisted laser shot peening. Background technique [0002] Laser shot peening technology uses the interaction between laser and material to generate plasma detonation wave, and the pressure of detonation wave propagates inside the material at extremely high speed and ultra-high pressure, inducing high-density dislocation structure and a certain degree of grain refinement. For example, the invention patent application with the application number CN201810047122.4 proposes a method for refining and strengthening the surface grains of copper-chromium alloys. Through laser shock strengthening technology, fine particles and high residual compressive stress are formed on the surface area of ​​copper-chromium alloys. The fine-grained layer, on the one hand, refines the surface structure of c...

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Problems solved by technology

This method obtains a smaller grain size than the traditional laser shot peening technology through the thermal-mechanical coupling effect, but it still has the following disadvantages: (1) High temperature has a great influence on the properties of the core material of the part, which is not conducive to the formation of external strength. Internally tough material structure; (2) The energy utilization rate of the temperature field is low and the cost is high; (3) Due to the prevention of high temperature damage, the laser temperature shot peening equipment is complex and expensive

The above method uses ultrasonic vibration to stir / shock the laser-induced molten pool to achieve microstructure, but has the following disadvantages: (1) There are many structural defects in the laser melting process and it is difficult to control, such as pores, cracks, etc.; (2) Residual tensile stress appears on the surface of the material after laser melting, which is not conducive to the improvement of fatigue strength

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