Sine waveform device for preparing semi-solid metal slurry

Abstract

The invention discloses a sine waveform device used for preparing semi-solid metal slurry and a preparation method thereof. A flow channel of liquid metal is designed into sine waveform in the device. The flow direction of the liquid metal can be changed constantly and realize automatic even agitation when low superheat liquid metal flows through. In addition, due to the cooling effect at the bottom and the sidewall, a large number of primary crystals are produced from the liquid metal, the primary crystals which do not grow up yet detach from the container wall to enter into the liquid metal under the impact of the subsequent liquid metal, and finally form semi-solid slurry with large amount of globular crystals at the outlet of the channel of a sine waveform container. By adjusting the number of waveform and the inclination angle of the sine waveform container, and the indenter height of the liquid metal inside an inlet container, the number of nucleation can be controlled, as well as grain refinement and equiaxial effect can also be affected. The sine waveform device of the invention has the advantages of simple structure, compact process, high efficiency on energy saving, short process, wide application range, and can realize the preparation of semi-solid metal slurry such as iron and steel materials, aluminum alloy, magnesium alloy, etc.

Description

technical field [0001] The invention belongs to metal material processing and molding technology, in particular to a semi-solid metal processing technology, and relates to a sinusoidal waveform device for preparing semi-solid metal slurry and a preparation method thereof. Background technique [0002] Semi-solid metal material forming technology is a very popular technology in the past 20 years. This technology can produce complex parts in near-net shape, with good product performance, energy saving, improved production efficiency, expanded product range, high efficiency and energy saving and short process conforming to The direction of greening the modern manufacturing industry, so it has a broad industrial base and potential. [0003] The key and premise of semi-solid processing and forming technology is to produce semi-solid slurry. At present, there are many methods for preparing semi-solid slurry, such as (mechanical, electromagnetic) stirring method, strain activation...

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Problems solved by technology

However, a problem with this method is that when the molten metal flows on the slide plate, there is oxidation of the molten metal and adhesion between the slide plate and the molten metal is prone to occur.

Chinese patent 200710011510.9 provides a wave type inclined plate vibration device and preparation method for preparing semi-solid alloys. The advantage of this method is to improve the stirring effect in the flow of molten metal and solve the adhesion between inclined plate and molten metal, but still Oxidation problem exists

Chinese patent 200410009295.5 provides a method for preparing semi-solid metal slurry by pouring superheated metal liquid directly into the preparation crucible or first into the vertical straight pipe channel and then into the preparation crucible. Directly pouring into the crucible to obtain the semi-solid metal slurry requires Precisely control the process parameters such as pouring temperature and pouring height. When pouring into the vertical straight pipe channel and then flowing into the preparation crucible to obtain semi-solid metal slurry, the effect of stirring and cooling on the molten metal is not significant, which is often used in the preparation of high solid phase rate slurry. sometimes difficult

This method overcomes many defects of many previous methods and has a good effect. However, the inclination angle of the inclined pipe cannot be changed during use, and after a long time of work, metal residues are prone to appear at the junction of the inclined pipe and the vertical pipe, which is serious. may clog pipes

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