Device for improving foaming uniformity of foamed aluminum and foaming technology

Abstract

Provided is a device for improving a foaming uniformity of foamed aluminum. The device comprises a mould case provided with a foaming cavity. The mould case is designed into a big-end-up platform or a square pyramid opening cavity structure. The mould case is provided a pressurizing cover plate with multiple dimensions in a matched mode. The center portion of the pressurizing cover plate is connected with a hydraulic piston rod. The peripheral edge of the pressurizing cover plate is provided with a sealing ring. The pressurizing cover plate is further provided with an electric heater unit and one or more exhaust valves. A mould case body is arranged inside a thermal insulating chamber, and a melt is prevented from solidifying in a excessively fast mode. The outer wall of the mould case is provided with cooling pipelines. Cooling treatment is carried out on the melt according to needs. The structure is simple, the design is novel, by adopting pressurizing and cooling, after the melt is cooled to a semi-solid state and thickened, natural foaming or decompression foaming is carried out, and bubbles are prevented from floating upwards. The up and down consistency of the foamed melt density can be guaranteed, it is guaranteed that foaming is even, the product yield is improved, and the problem that a traditional melt foaming method is uneven in foaming is solved.

Description

technical field [0001] The invention relates to the technical field of aluminum foam processing, in particular to a process for improving the foaming uniformity of aluminum foam and a special pressurized foaming mold. Background technique [0002] Metal foam is a new type of multi-purpose material. Commonly used porous metal materials include bronze, nickel, titanium, aluminum, stainless steel, and other metals and alloys. Among all porous metal materials, aluminum foam is particularly valued. The development of modern technology has made the preparation technology of aluminum foam more and more perfect, and the manufacturing cost has been continuously reduced. Metal foam, represented by aluminum foam, is a new type of functional structural material that has developed rapidly in recent years. It has excellent mechanical damping, noise reduction, energy absorption, electromagnetic shielding, etc., and is light, strong, and heat-resistant. , beautiful, and has broad applicati...

AI Technical Summary

Problems solved by technology

However, during the foaming process of the traditional melt foaming method, the pores produced by the foaming agent float up, and the upper part of the melt has more pores than the lower part, resulting in uneven foaming of aluminum foam and a low pass rate.

In order to change this way of pore floating, some researchers use the method of adding a viscous agent to increase the viscosity of the melt and control the floating of the air bubbles. However, in the actual application process, it is found that because the viscous The fluidity of the melt after the thickener is still very large before solidification, causing the bubbles to still float up, causing the melt to foam up and down unevenly, with fewer bubbles at the bottom and higher density, more bubbles at the top and lower density, and poor product qualification rate

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