Method and device for manufacturing semi-solid metal by using serpentine vibration channel

Abstract

The invention belongs to the technical field of semi-solid metal forming and provides a method and a device for manufacturing semi-solid metal by using a serpentine vibration channel. Molten metal with certain superheat degree is poured into an upper opening of the vertical or oblique serpentine channel with a mechanical vibration characteristic, the superheated molten metal downward flows to a lower outlet of the serpentine channel along the inner wall of the serpentine channel under the mechanical vibration effect to form the semi-solid metal. The device comprises a pouring ladle, the superheated molten metal, a pouring cup, the serpentine channel, an electric-excitation mechanical vibrator, an electric-excitation vibrator controller, the semi-solid metal, a collecting container, a pressure chamber, a punch pin and the shaping and ejector die portion. The method and the device have the advantages that cooling, nucleation and crystalline grain dissociation of the molten metal in the serpentine channel are promoted by utilizing the electric-excitation mechanical vibrator, the hanging amount on the inner wall of the serpentine channel is reduced, the cleaning work difficulty is reduced, the metal re-melting amount and the melting energy consumption are reduced, and the device is simple in structure and low in production cost and is suitable for manufacture 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 serpentine 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, Foundr...

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Problems solved by technology

However, in the process of semi-solid metal preparation, since the primary crystal grains nucleated along the inner wall of the serpentine channel cannot be completely freed, the remaining grains will continue to grow, often blocking the serpentine channel, and the preparation of semi-solid metal is forced to stop process, which reduces the semi-solid metal capacity of each preparation of the serpentine channel, which is not conducive to parts with large rheological deformation

In the process of semi-solid metal preparation, even if the serpentine channel is not completely blocked, a large amount of hanging material will be generated in the serpentine channel. The amount of hanging material can account for 10% to 30% of the weight of the cast metal, which greatly increases the cleaning time The difficulty of the material also greatly increases the amount of metal returned to the furnace and the energy consumption of melting

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