Hot-molten metal micro-droplet direct on-demand printing mechanism based on piezoelectric micro jetting

Abstract

The invention provides a hot-molten metal micro-droplet direct on-demand printing mechanism based on piezoelectric micro jetting. The mechanism comprises a base, a flexible displacement amplificationmechanism, a piezoelectric stack, a push rod, a rigid pressing ring, a hot melting cavity structure and an elastic membrane. The flexible displacement amplification mechanism and the hot melting cavity structure are both fixed to the base. A conic cavity is formed in the center of the hot melting cavity structure. A feeding hole is formed in the upper wall face of the hot melting cavity structureand communicates with the conic cavity through a communicating groove channel. A jetting micropore is formed in the pointed end of the conic cavity. The piezoelectric stack is connected with the inputend of the flexible displacement amplification mechanism. One end of the push rod is connected with the output end of the flexible displacement amplification mechanism, and the other end of the pushrod is connected with the elastic membrane. The rigid pressing ring presses the elastic membrane to cover an opening of the conic cavity to form a closed cavity. By means of the mechanism, direct printing and jetting of hot-molten metal micro-droplets can be achieved, the structure is simple and compact, the shapes of jetted hot-molten metal micro-droplets are regular, and the outlet speed and size can be controlled.

Description

Technical field [0001] The invention belongs to the field of hot-melt metal micro-droplet jetting, and in particular relates to a direct-on-demand printing mechanism for hot-melt metal micro-droplets based on piezoelectric micro jetting. Background technique [0002] At present, the hot-melt metal micro-droplet jet printing technology has good application prospects in the repair of small defects in metal parts, the printing and molding of micro-complex metal structures, and the soldering of electronic components. The existing uniform molten metal jet deposition technology has a relatively complicated method for accurately controlling the ejected continuous fluid, and it is difficult to achieve on-demand injection. It is generally used for high-frequency continuous jet deposition manufacturing; in addition, the existing melting based on pneumatic drive The metal droplet ejection method is limited by the compressibility of the gas, and has the disadvantages of poor control effect, ...

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention aims to propose a direct on-demand printing mechanism of hot-melt metal micro-droplets based on piezoelectric micro-spraying. The present invention can realize direct printing and jetting of hot-melt metal micro-droplets. The pressure system only relies on gravity to make the molten metal continuously flow into the cavity along the liquid supply channel. The shape of the sprayed hot melt metal micro-droplets is regular, and the exit speed and volume are controllable. The problem of complex material manufacturing process and low material utilization rate and the low precision, complex structure and slow response of the pneumatic-based molten metal droplet printing method

Images