Preparation device and preparation method of metal semi-solid slurry

Abstract

The invention provides a preparation device and a preparation method of metal semi-solid slurry. The preparation device comprises a container, an electromagnetic inductor and a vibrator. The container is placed in the electromagnetic inductor, the vibrator is located below the electromagnetic inductor, and the vibrator vibrates the container. The electromagnetic inductor comprises a cylindrical shell and an electromagnetic induction coil arranged on the inner wall of the shell, and the electromagnetic induction coil is spirally wound on the inner wall of the shell. Mechanical vibration and electromagnetic induction are comprehensively utilized, mechanical vibration generated by the vibrator and a weak stirring effect generated by the electromagnetic inductor jointly promote internal flowing of the metal melt and improve the melt temperature field uniformity and solute dispersion uniformity, and the heating effect generated by electromagnetic induction on the surface melt reduces the temperature difference between the surface layer and the core part of the melt. The semi-solid slurry prepared by the method is free from contact pollution and has a uniform microstructure, and the solid phase content is precisely controllable in a range of 10-50%.

Description

technical field [0001] The invention belongs to the technical field of metal semi-solid processing, and relates to a preparation device for metal semi-solid slurry, in particular to a preparation device for metal semi-solid slurry and a preparation method thereof. Background technique [0002] In the late 1970s, researchers such as M.C. Flemings of the Massachusetts Institute of Technology discovered the rheological properties of metal semi-solid slurries and pioneered metal semi-solid processing technology. The preparation of semi-solid slurry is the basis and key of metal semi-solid processing. There are many methods for preparing metal semi-solid slurry, such as single-screw stirring method, double-screw stirring method, electromagnetic stirring method, bubble stirring method, low superheat casting And weak mechanical stirring method, turbulence effect method, chemical grain refinement method, ultrasonic treatment method, spray deposition method, cooling chute method, con...

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Problems solved by technology

The disadvantage of this method is that it is difficult to ensure the uniformity of the internal temperature field and microstructure of the slurry, and it is not suitable for non-aluminum-silicon-based aluminum alloys.

This method can obtain a semi-solid slurry with uniform temperature field and microstructure. The disadvantage is that the equipment structure and preparation process are relatively complicated. The insertion of the graphite head and the stirring rod into the melt is easy to bring in the oxide skin, and the stirring is easy to cause air and oxide skin to be involved. cause melt contamination

[0007] At present, the existing technology applies contact treatment to the metal melt, such as mechanical agitation, air flow agitation and ultrasonic vibration, etc., which is easy to introduce scale, cause melt pollution, and cause low product quality. When the content is higher than 40%, it becomes difficult to pull out the metal melt from the contact processing structure, that is, it is not suitable for the preparation of semi-solid slurry with high solid content (greater than 40%)

In addition, only electromagnetic stirring or non-contact mechanical action (vibration or shaking) is applied, the stirring effect is limited, the temperature field and microstructure uniformity of the semi-solid slurry need to be improved, and it is not suitable for high solid phase content of narrow process window alloys Semi-solid slurry (solid phase content greater than 40%)

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