Compound extrusion casting method of aluminum alloy ring

Abstract

The invention relates to a compound extrusion casting method of an aluminum alloy ring and aims to overcome the defects that severe hole-shrinkage and collapsing occurs in casting of aluminum alloy ring parts and the metallographic structure is poor in compactness. The method includes: manufacturing a compound extrusion casting mold and manufacturing the aluminum alloy ring by means of smelting of aluminum alloy melt, pouring, and compound extrusion casting. The method has the advantages that the method is technically advanced, data are accurate and full, the aluminum alloy ring made by compound extrusion casting has precise shape, the metallographic structure is good in compactness, no shrinking or collapsing occurs, tensile strength is up to 230MPa, hardness is up to 75HB, pinhole degree is first-class, and the method is ideal and is suitable for manufacturing other aluminum alloy parts.

Description

technical field [0001] The invention relates to a compound extrusion casting method of an aluminum alloy ring, which belongs to the technical field of preparation and application of aluminum alloy special-shaped parts. Background technique [0002] Squeeze casting of aluminum alloy products is a liquid forming process, which applies high mechanical pressure to the liquid alloy poured into the mold cavity to make it solidify and form into mechanical parts and products. [0003] At present, direct squeeze casting is to pour liquid metal directly into the metal mold, and then close the mold to realize the filling and flow of molten metal, so that the molten metal fills all the cavity, continue to increase and maintain pressure to solidify the casting, and demould after cooling. Complete the whole process of casting; with the development of technology, there are more aluminum alloys with special shapes and complex parts, and it is difficult for liquid metal to be solidified unde...

AI Technical Summary

Problems solved by technology

[0003] At present, direct squeeze casting is to pour liquid metal directly into the metal mold, and then close the mold to realize the filling and flow of molten metal, so that the molten metal fills all the cavity, continue to increase and maintain pressure to solidify the casting, and demould after cooling. Complete the whole process of casting; with the development of technology, there are more aluminum alloys with special shapes and complex parts, and it is difficult for liquid metal to be solidified under pressure during casting filling, especially at corners, edges and special-shaped structural parts. Pressurized and solidified, resulting in the formation of shrinkage porosity and shrinkage cavities during casting, which will cause great harm to the quality of castings; some use indirect extrusion casting, using a forming pressure head to squeeze the aluminum alloy liquid into the cavity, and then press The inrunner composed of the head and the die transmits the pressure to the casting; but the pressure head is only part of the pressurized casting, the metallographic structure of the casting is less compact, and after the molten metal is injected into the cavity, due to the Filling flow, the temperature of the molten metal has dropped, the runner part has begun to solidify, and the pressure transmission effect is not good, so the casting often has shrinkage cavity and shrinkage porosity

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