An electromagnetic stirring device for semi-solid die casting

Abstract

The invention discloses an electromagnetic stirring device for semi-solid die-casting, which includes a placing table and a stirring furnace arranged in a stirring furnace placement cavity on the top of the placing table, and a plurality of stirring blades are formed on the inner side wall of the stirring furnace. , the top of the stirring furnace is clamped with a connecting frame, the top of the connecting frame is fixedly connected with a connecting rod, the top of the connecting rod passes through a fixed plate, and is connected to a connecting plate, and the connecting plate and the fixed plate are rolled A steel ball is connected, and a rotating gear is sleeved on the connecting rod, and the rotating gear meshes with a driving gear connected to the output shaft of the driving motor. The invention stirs the slurry by combining electromagnetic stirring and mechanical stirring, and stirs the outer ring of the slurry with additionally added stirring blades, which solves the problem of preparing large-sized semi-solid metal slurry.

Description

technical field [0001] The invention relates to an electromagnetic stirring device, in particular to an electromagnetic stirring device for semi-solid die-casting, and belongs to the technical field of semi-solid die-casting applications. Background technique [0002] The airtightness of new energy automobile parts determines the overall performance of new energy automobiles. Most traditional automobile parts are molded by high-speed and high-pressure die-casting in a molten liquid state. For new energy automobile parts castings with high requirements for high density and physical properties, porosity problems It cannot be completely solved; the yield rate is low; the manufacturing cost is high. In order to improve the airtightness of new energy vehicle parts, semi-solid die-casting can be used to make parts. [0003] Compared with traditional casting, the semi-solid metal slurry contains spherical solid phase particles, which reduces the solidification shrinkage and improve...

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Problems solved by technology

[0002] The airtightness of new energy automobile parts determines the overall performance of new energy automobiles. Most traditional automobile parts are molded by high-speed and high-pressure die-casting in a molten liquid state. For new energy automobile parts castings with high requirements for high density and physical properties, porosity problems It cannot be completely solved; the yield rate is low; the manufacturing cost is high. In order to improve the airtightness of new energy vehicle parts, semi-solid die-casting can be used to make parts

[0003] Compared with traditional casting, the semi-solid metal slurry contains spherical solid phase particles, which reduces the solidification shrinkage and improves the feeding capacity, thereby reducing or eliminating the tendency of shrinkage porosity, so the semi-solid metal slurry with excellent structure The preparation of material or billet is the basis and key to realize semi-solid metal processing technology. When mechanical stirring is used, the stirring blade is in direct contact with the metal melt. The equipment structure is simple and the process parameters are easy to control; during the mechanical stirring process, a high shear rate can be obtained. speed, which is conducive to the formation of a fine near-spherical microstructure, but there are often dead zones in the stirring tank that cannot be stirred, which affects the uniformity of the slurry, and the corrosion of the stirring blade and its pollution to the semi-solid metal slurry will affect the quality of the billet. bring adverse effects; electromagnetic stirring belongs to non-contact stirring technology, which uses electromagnetic induction force to break the primary dendrites, which is characterized by pure metal liquid and is suitable for high melting point alloys and mass production; but due to the induced electromagnetic force from melting The edge of the pool gradually decays to the center of the melt. When a solidified shell is formed around the molten metal, the stirring effect is greatly weakened, so it is not suitable for the preparation of large-sized semi-solid metal ingots, which makes it difficult to perform semi-solid die-casting on large auto parts way of production

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