Antigravity vacuum sucking cast process for preparing aluminium base composite material

Abstract

The antigravity vacuum sucking cast process for preparing aluminum base composite material in casting field includes the following steps: 1. heating to melt the composite material in crucible under the protection of inert gas and stirring; 2. shutting off inert gas, closing the middle partition board and vacuum pumping to refine; 3. finishing vacuum refining, introducing inert gas to crucible surface, and installing riser tube, mold cavity and sleeve; 4. vacuum pumping the mold cavity and antigravity filling liquid metal into the mold cavity; and 5. maintaining for crusting before increasing the pressure of inert gas to the lower cavity, feeding and solidifying composite material under the action of both vacuum in the upper cavity and the pressure of the lower cavity. The present invention raises the mechanical performance of aluminum base composite material casting, can form thin wall complicated aluminum base composite material casting, and has high production efficiency and high casting precision.

Description

technical field

[0001] The invention relates to a preparation method in the technical field of casting, in particular to a preparation method of anti-gravity vacuum suction casting of aluminum-based composite materials. Background technique

[0002] There are relatively many precision casting methods for aluminum alloy parts. The commonly used ones are: metal mold casting, pressure casting and lost foam casting under gravity filling and solidification, and low pressure casting, differential pressure casting and investment suction casting under anti-gravity filling and solidification. casting etc. Anti-gravity casting is a method of pouring liquid metal against gravity using pressure difference. In order to overcome the limitations of the common anti-gravity casting method, that is, the mold is required to have good air permeability and high strength; in addition, the aluminum alloy in the liquid state is easily oxidized and gas-absorbed when in contact with air. , It is ea...