Technology and die-casting device for aluminium silicon carbide accurate die-casting forming

Abstract

The invention relates to a technology and a die-casting device for aluminium silicon carbide accurate die-casting forming. The die-casting device comprises a forming die, an inner die sleeve, and an outer die sleeve, wherein the forming die is mounted in a cavity of the inner die sleeve; the inner die sleeve provided with the forming die is mounted in a cavity of the outer die sleeve; the bottom surface of the outer die sleeve is connected with a workbench; and the other side of the workbench is connected with a workbench base by an articulated mechanism. With the adoption of the technology and the die-casting device, air mass formed between silicon carbide can be discharged by a die bottom plate and sent into aluminium liquid of an outer die cavity; silicon carbide particles in an inner die cavity are bonded with each other due to positive pressure and negative pressure action during continuous reciprocating motion; air is exhausted timely; the compactness of aluminium liquid permeation is improved greatly; and finished silicon carbide has better hardness and elastic modulus.

Description

technical field [0001] The invention relates to the field, in particular to an aluminum silicon carbide precision die-casting forming process and a die-casting device thereof. Background technique [0002] Aluminum silicon carbide composite materials have many advantages such as light weight, high rigidity, small thermal expansion coefficient, high thermal conductivity, good geometric accuracy stability, certain toughness, moderate mechanical strength, etc., and become a variety of multi-chip components and large current power It is an ideal base material for modules (such as IGBT modules), and an ideal material for various parts with small mass and high strength (such as aviation parts). At present, when aluminum silicon carbide composite materials are manufactured by die casting, porosity is the main cause of defective aluminum silicon carbide, so effective degassing is the key to the die casting process. [0003] The traditional technology is to submerge the mold as ...

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Problems solved by technology

[0003] The traditional technology is to submerge the mold as a whole in molten aluminum, and use high pressure to hydraulically inject the aluminum into the silicon carbide prefabricated block. However, the air in the silicon carbide prefabricated block cannot be discharged, and high-pressure air masses are formed under the action of high pressure. The thermal conductivity of the finished aluminum silicon carbide will become worse and worse, because the air mass separates the effective transfer of heat between the silicon carbide and the aluminum, and the appearance of the air mass affects the density of the aluminum liquid infiltrated in the silicon carbide, and the aluminum Poor liquid permeability affects the physical properties of aluminum silicon carbide such as hardness and elastic modulus. Finally, during the annealing treatment of aluminum silicon carbide products, the air mass concentrated on the surface of silicon carbide will form a convex bubble-shaped thin wall or rupture to produce pores, affecting The smoothness of the product surface and the implementation of the follow-up process

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