Method for preparing semi-solid metal slurry

Abstract

A method for preparing semi-solid metal slurry includes the steps that (1), smelted and refined liquid metal at the temperature above the liquidus temperature is poured into a slurrying pipe of a semi-solid slurry preparation device; (2), the slurry is pushed and squeezed under certain pressure in a reciprocating manner, the slurry is transferred back and forth in two or more cavities in the slurrying pipe through relatively-narrow channels in the middles, the semi-solid slurry is promoted by the reciprocating pressure and is repeatedly and violently sheared in the process of transferring among the cavities, the grain refining effect is improved greatly, all the slurry is made to participate in transferring among the cavities as much as possible, and the uniformation of slurry processing is guaranteed; and (3), after slurrying is completed, the slurrying pipe is opened, and the slurry is poured out. The prepared metal semi-solid slurry is wee in grain, uniform in distribution and smallin gas content; and meanwhile the preparation process has the beneficial effects that the procedures are short, the efficiency is high, the equipment requirements are low, the operation is easy, andthe prepared material is especially suitable for various light alloys.

Description

Technical field [0001] The invention belongs to the technical field of metal material semi-solid processing, and particularly relates to a method for preparing metal semi-solid slurry. Background technique [0002] Metal semi-solid forming technology is recognized as the most promising light alloy near-net forming technology in the 21st century. Its purpose is to change the dendritic structure naturally formed in the liquid metal forming process to improve the comprehensive mechanical properties of metal parts. . There are two major types of metal semi-solid processing: thixotropy and rheology. However, due to the high production cost, difficulty in forming complex parts, and difficulty in controlling the production process, the thixoforming technology has three typical defects. Shape technology is increasingly favored by the industry. At present, the commonly used methods for preparing metal semi-solid rheological slurry mainly include mechanical stirring method, electromagnet...

AI Technical Summary

Problems solved by technology

Metal semi-solid processing has two types of processes: thixoforming and rheoforming. However, due to three typical defects of thixoforming technology, such as high production cost, difficulty in forming complex parts, and difficult control of the production process, rheoforming Shape technology is increasingly favored by the industry

At present, the commonly used methods for preparing metal semi-solid rheological forming slurry mainly include mechanical stirring method, electromagnetic stirring method, double helix stirring method, vibration method, single roller rotation method, spray deposition method, inclined cooling plate method, rotating conveying method, etc. Tube method, turbulence effect method, liquid mixing method, etc., but because these processes are all open low-pressure processing methods, there are generally disadvantages such as insufficient slurry grains, uneven processing quality, and easy air entrainment.

Images