A continuous preparation process of aluminum foam pellets with advanced pore shape

Abstract

The invention discloses a continuous preparing technology of advanced-pore-state foamed aluminum balls. A device is used for continuously producing APM foam padding balls in a batched manner. According to the technical scheme, Al powder, Si powder and TiH2 powder mixed powder which are evenly mixed and have a certain mass ratio are added into a hot pressure machine, cracked portions on the edge of a board subject to hot pressing are cut off through a reversible type hot rolling machine, and a prefabricated board with a certain compactness is obtained; the prefabricated board subject to hot rolling in the second step is cut into a plurality of strip-shaped foaming precursors with the square section through a cutting roller, then the precursors enter a limiting flat roller, the strip-shaped precursors stretching by a certain length are cut into cubic small blocks with a certain specification through a flying shear, the cubic small blocks enter a high-temperature electric heating tunnel furnace through a conveying belt, and the blocks are subject to temperature rise and foaming in the electric heating tunnel furnace; when the foaming bodies are subject to temperature rise and expand to be in the near spherical shape, the foaming bodies enter an atomizing area, atomized cooling water is sprayed out, and the balls are rapidly cooled and molded.

Description

technical field [0001] The invention relates to a continuous preparation process of Advanced Pore Morphology (Advanced Pore Morphology) aluminum foam balls, belonging to the field of foam metal material preparation. Background technique [0002] With the rapid development of automobiles, aerospace and other high-tech industrial fields, the requirements for lightweight material structures are getting higher and higher. Metal foam composite structures have many excellent properties such as light weight, high stiffness, and vibration reduction, which are in line with production and market needs. They have received close attention from scholars and manufacturers, and occupy an important position in the field of new materials. [0003] From the perspective of the market application of foamed aluminum, most of them are used to integrate composite structures with dense metals. People use powder metallurgy to obtain near-net-shape aluminum foam so as to reduce the post-treatment pr...

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Problems solved by technology

[0006] At present, the research and development of domestic APM foam spherical filler is still in the initial stage, and has not been commercialized. In the laboratory preparation method, it generally needs to go through powder mixing, powder mixing, cold pressing, hot extrusion, cutting, grinding, foaming, and cooling. , screening and other process steps

During the period, there are many and complex molds and high requirements for dimensional accuracy; and the whole process requires manual fine operation, which takes too long, and the operation is scattered and the production process is discontinuous, resulting in a large increase in accidental errors; and according to the performance requirements of the composite structure, Uniform foam cores, heterogeneous foam cores and local density gradient foam cores all require a large number of APM foam spherical fillers with different sizes, densities, and porosities. The laboratory production scale is small, the process operation is scattered, and the production process is not stable. Continuous, low yield makes it more difficult to control the spherical structure, specific strength, and specific stiffness of APM fillers, and it is difficult to ensure the reproducibility of product performance and structure; and the finished product is too high, far from meeting the needs of mass production of standardized specifications

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