New metal continuous foaming process

Abstract

The invention relates to a new metal continuous foaming process. The process includes the steps that (1) melting metal liquid is led into a stirring tank, and a thickener is added; (2) a stirrer extends into the stirring tank, a cavity is formed inside a stirring rod of the stirrer, a small air hole communicated with the cavity is formed in a stirring blade of the stirrer, and the interior of the stirring rod is connected with a tank containing liquid nitrogen or dry ice through an air pipe; (3) the stirrer is started, the liquid nitrogen or dry ice is led into the stirring rod through the air pipe, the liquid nitrogen or dry ice absorbs heat to vaporize to be discharged out from the small air hole, air leading and stirring are carried out at the same time, the vaporized liquid nitrogen or dry ice forms bubbles in metal liquid, and then stirring is carried out through the stirrer to enable the bubbles to be evenly distributed into the metal liquid; (4) before the temperature approaches the metal liquid solidification starting temperature, a discharging opening in the bottom of the stirring tank is opened, and metal liquid obtained after stirring flows into a die casting production line to be subject to direct pouring molding; and (5) after stirring is completed, the stirrer rises, and cooling and stirring are carried out under the condition that the smoothness of the air hole is kept for use next time.

Description

technical field [0001] The invention relates to the technical field of metal foaming, in particular to a new metal continuous foaming process. Background technique [0002] Porous metal foam material is composed of metal skeleton and pores, which is a kind of functional material developed in recent decades. Since its inception, as a structural material, it has the characteristics of light weight and high specific strength; as a functional material, it has various physical properties such as porous, vibration reduction, damping, sound absorption, sound insulation, heat dissipation, impact energy absorption, and electromagnetic shielding. In addition to its recyclable characteristics, it adapts to the needs of current development and has been more and more widely used in general industrial fields and high-tech fields at home and abroad. [0003] The porous metal foam materials that have been developed so far include foamed aluminum (and foamed aluminum alloy), foamed nickel, ...

AI Technical Summary

Problems solved by technology

[0005] The disadvantages of traditional preparation methods are as follows: 1. Continuous preparation cannot be realized, resulting in low productivity and limited material molding length; 2. Since the material is left open when foaming, the generated bubbles will converge and become larger, which will affect the material. performance, and even voids; at the same time, standing still causes the aluminum alloy to drop and the bubbles to rise, making it difficult for the existing process to exceed 40% yield, which objectively causes waste of resources and increases costs

Images