Vibrating inverted-cone-shaped channel method and device for preparing semi-solid metal

Abstract

The invention provides a vibrating inverted-cone-shaped channel method and device for preparing semi-solid metal and belongs to the technical field of semi-solid metal forming. Superheated molten metal is directly poured into an upper opening of an inverted-cone-shaped channel with vibration characteristics, the superheated molten metal flows downwards along the inner wall of the inverted-cone-shaped channel till a lower outlet of the inverted-cone-shaped channel under the continuously effect of mechanical vibration, and then the semi-solid metal is obtained. The device comprises a pouring ladle, the superheated molten metal, a pouring cup, the inverted-cone-shaped channel, an electrically-excited mechanical vibrator, an electrically-excited vibration controller, the semi-solid metal, a collecting container, a pressure chamber, a punch, a fixed die and an ejector die. The device and the method have the advantages as follows: cooling, nucleation and grain dissociation of the molten metal in the inverted-cone-shaped channel are facilitated through the electrically-excited mechanical vibrator, the quantity of hangings on the inner wall of the inverted-cone-shaped channel is remarkably reduced, the cleaning difficulty is greatly reduced, the metal remelting quantity and the melting energy consumption are reduced, the equipment structure is simple, the production cost is low, and the method and the device are applicable to preparation of the semi-solid metal.

Description

technical field [0001] The invention belongs to the technical field of semi-solid metal forming, and in particular provides a method and device for preparing a vibrating inverted cone channel of semi-solid metal. Background technique [0002] In the early 1970s, Flemings and others at the Massachusetts Institute of Technology (MIT) invented the semi-solid metal forming technology, which aroused widespread concern from scholars and industries from all over the world, and then scholars from various countries conducted in-depth and extensive basic theoretical and technology research. It can be seen from the research and practical application that in the semi-solid metal forming technology, the preparation of semi-solid metal is always in the key position. According to the literature "Behavior of metal alloys in the semisolid state" (M C Flemings, Metall Trans, 1991, 22A: 957-981), "Research progress in advanced preparation technology of semi-solid metal paste" (Mao Weimin, Fou...

AI Technical Summary

Problems solved by technology

However, in the process of semi-solid metal preparation, since the primary grains nucleated along the inner wall of the inverted conical channel cannot be completely dissociated, the remaining grains will continue to grow, often blocking the inverted conical channel, and are forced to terminate the semi-solid state. The preparation process of solid metal reduces the semi-solid metal capacity of each preparation of the inverted tapered channel, which is not conducive to parts with large rheological deformation

In the process of semi-solid metal preparation, even if the inverted cone-shaped channel is not completely blocked, a large amount of hang-ups will be generated in the inverted-cone-shaped channel, and the amount of hang-ups can account for 10% to 30% of the weight of the cast metal, which greatly It increases the difficulty of cleaning up the hanging material, and also greatly increases the number of metal remelting and melting energy consumption

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