Preparation method of foamed aluminum special-shaped part

Patent metadata

Field	Value
Publication number	US-11565310-B2
Application number	US-202117387966-A
Country	US
Kind code	B2
Filing date	Jul 28, 2021
Priority date	Nov 3, 2020
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

Disclosed is a preparation method of a foamed aluminum special-shaped part. The preparation method comprises the following steps: S1, pressing wax molds; S2, making a shell; S3, carrying out smelting; S4, carrying out casting; and S5, vibrating the shell. Finally, the foamed aluminum special-shaped part is obtained for a preparation process of a foamed aluminum compound casting.

First claim

What is claimed is:

1. A preparation method of a foamed aluminum special-shaped part, comprising the following steps:
S1, pressing wax molds, by designing and manufacturing a profiling mold according to the requirements of the foamed aluminum special-shaped part, pressing a fusible material into the wax molds by using the profiling mold, and welding the multiple wax molds on a wax casting system to form a wax mould;
S2, making a shell, by soaking the wax mould into a coating prepared from sodium silicate and quartz powder, taking out the wax mould, scattering quartz sand to the wax mould, hardening the wax mould in a hardening agent, repeating the steps for multiple times until a hardened shell with a certain thickness is formed on a surface of the wax mould, heating the wax mould with the hardened shell in hot water at 80-90° C., enabling the wax mould to flow out from a sprue after being molten to form a casting cavity so as to obtain the shell, drying and roasting the shell, carrying out sand filling around the shell, carrying out preheating, and waiting for casting;
S3, carrying out smelting, by carrying out melting, refining, component adjustment, refining and modifying, slag and hydrogen measurement, and standing for heat preservation, adding a tackifier, stirring, adding a foaming agent, and stirring;
S4, carrying out casting, by casting a metal melt to be foamed into the preheated shell, carrying out heat preservation, carrying out sufficient foaming, and then taking out and cooling the shell; and
S5, vibrating the shell, by vibrating the shell by adopting a shell vibrating machine, wherein a shell vibrating portion is positioned at a sprue cup.

2. The preparation method of the foamed aluminum special-shaped part according to claim 1 , wherein the roasting in step S2 is performed at a temperature of 850-950° C.

3. The preparation method of the foamed aluminum special-shaped part according to claim 1 , wherein the tackifier in step S3 is Ca, and is added with an adding amount of 0.6-2.0% of the mass of the melt and at a tackifying temperature of 700-750° C., the stirring after adding the tackifier and before adding the foaming agent is performed at a stirring speed of 500-800 r/min and a stirring time of 180-300 s.

4. The preparation method of the foamed aluminum special-shaped part according to claim 1 , wherein the foaming agent in step S3 is TiH 2 , and is added with an adding amount of 0.8-2.5% of the mass of the melt and at a foaming temperature of 680-720° C., the stirring after adding the foaming agent is performed at a stirring speed of 900-1500 r/min and a stirring time of 30-60 s.

5. The preparation method of the foamed aluminum special-shaped part according to claim 1 , wherein the shell in step S4 is preheated to 680-750° C., the foamed aluminum special-shaped part with the shell is cooled by wind mist cooling, with a cooling time of 60-120 s.

6. The preparation method of the foamed aluminum special-shaped part according to claim 1 , furthering comprising:
cleaning the foamed aluminum special-shaped part obtained after step S5 is completed by using a NaOH aqueous solution with a mass fraction of 10%;
air-drying the foamed aluminum special-shaped part; and
spraying a soldering flux to surface of the foamed aluminum special-shaped part, and the soldering flux is a potassium fluozirconate aqueous solution with a concentration of 3-10%.

Assignees

• Citic Dicastal Co Ltd

Inventors

• Han Xing
• Liu Haifeng
• Sun Yu
• Gao Yugang

Classifications

• B22D27/04

  Influencing the temperature of the metal, e.g. by heating or cooling the mould · CPC title

• B22C3/00

  Selection of compositions for coating the surfaces of moulds, cores, or patterns · CPC title

• B22D21/04

  Casting aluminium or magnesium {(no material; see B22D21/007)} · CPC title

• B22D27/08 Primary

  Shaking, vibrating, or turning of moulds · CPC title

• B22D25/005 Primary

  Casting metal foams · CPC title