Low-temperature shearing rheological die casting technology

Abstract

The present invention relates to a low-temperature shearing rheopectic die-casting process. It is characterized by that said process includes the following steps: (1), making alloy melt be passed through feeding device and be fed into turning conveying pipe, and adopting conveying pipe with low rotating speed to control cooling and implement splat cooling of molten metal and stirring of primary stage of coagulation; (2), making the melt with lots of crystal nucleus be flowed into a crystallization furnace, utilizing slurry microstructure on-line detection technique to control and detect growth form of nascent phase and solid-phase rate of slurry; and (3), making the slurry be injected into pressure chamber of die-casting machine to make directly-forming.

Description

technical field [0001] The invention relates to a semi-solid slurry rheological forming process, in particular to a low-temperature shear rheological die-casting process. Background technique [0002] Semi-solid forming technology is recognized as the most promising near-net forming technology for light alloys in the 21st century, including two forming routes of thixoforming and rheoforming. Although thixotropy has been successfully applied in industrial production, after years of production practice and in-depth research, it has been found that there are three major process defects in thixotropy: (1) high production cost, high electromagnetic stirring power, low efficiency, High energy consumption, about 40% more cost when preparing semi-solid billets; high energy consumption for remelting heating, serious oxidation of the billet surface, loss of metal accounts for about 5-12% of the weight of the billet; sawdust, remelting heating during The running soup, gating system an...

AI Technical Summary

Problems solved by technology

Although thixotropy has been successfully applied in industrial production, after years of production practice and in-depth research, it has been found that there are three major process defects in thixotropy: (1) high production cost, high electromagnetic stirring power, low efficiency, High energy consumption, about 40% more cost when preparing semi-solid billets; high energy consumption for remelting heating, serious oxidation of the billet surface, loss of metal accounts for about 5-12% of the weight of the billet; sawdust, remelting heating during The running soup, gating system and waste products cannot be recycled immediately, and must be returned to the blank preparation workshop or the production plant of the blank supplier, which increases production costs

(2) The liquid phase composition of the blank should not be too high, and it will be difficult to form complex parts, otherwise the handling of the blank will be difficult to achieve

Another main reason why rheological deformation has not been applied on a large scale is that the storage and transportation of semi-solid slurries are very inconvenient. The key is that the quality of slurries will deteriorate during storage and transportation

Therefore, how to effectively deal with the connection between the pulping equipment and the slurry forming equipment is the key to solving the problem. At present, there is no mature technology and equipment suitable for industrial production, and it needs to be independently developed.

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