Device and method for quickly extracting semisolid melt

Abstract

The invention relates to a device and a method for quickly extracting a semisolid melt, and belongs to the field of extraction and analysis of alloy melts. The device mainly consists of a high-cooling speed extracting copper mold, a temperature acquiring control system, an inert gas supply system and a vacuum extracting system, wherein a thermocouple in the temperature acquiring control system is mounted on the high-cooling speed extracting copper mold; the inert gas supply system and the vacuum extracting system are communicated with a cavity in the quick-cooling speed extracting copper mold through a pipeline and a hydraulic three-way valve; and the temperature acquiring control system and the hydraulic three-way valve are connected through a circuit. The device has higher cooling capacity, and is suitable for the extraction of the high-viscosity semisolid melt; and meanwhile, the device adopts a real-time temperature tracking and control modeto have high consistency with an alloy melt extracting structure. The device can be assembled according to the experimental requirement, synchronously performs the real-time extraction according to different melt positions or different melt depths, and analyzes the temperature field and the structural evolution of the alloy melts.

Description

technical field [0001] The invention relates to a device and method for rapid quenching of semi-solid melt, belonging to the field of quenching and analysis of alloy melt. Background technique [0002] Alloy melt is the basis of various forming methods such as casting, forging and semi-solid forming. The quality of alloy melt and the microstructure evolution during solidification are the decisive factors for the quality of formed parts, so the research on alloy melt at home and abroad is paying more and more attention. , especially the semi-solid rheological deformation process. [0003] Semi-solid forming is a new type of forming technology that combines casting and forging processes. It is an effective method that can achieve high performance, near-net shape, and low cost for aluminum alloy materials. It has been industrialized in many small parts and has greatly improved It has played a positive role in improving the yield of parts, reducing production costs, weight redu...

AI Technical Summary

Problems solved by technology

[0004] At present, the quenching methods of alloy melts mainly include overall liquid quenching of small-sized crucibles, water quenching of partial melts, and rapid extraction of copper tubes or copper molds, etc., but these methods require a certain transfer time, slow cooling speed, and tissue deformation. shortcoming

In semi-solid rheological deformation, the melt generally needs to be stirred electromagnetically or mechanically by an external field. In this case, the overall liquid quenching method for small-sized crucibles is not suitable, and cannot meet the application of external fields.

Water quenching of part of the melt requires a certain transfer time, resulting in a certain degree of growth of the structure after liquid quenching, which cannot correspond to process parameters such as temperature, and cannot represent the real melt state and evolution law

There is an obvious solid-liquid separation phenomenon in semi-solid melts, especially for high-solid fraction melts. Due to the limitation of cooling capacity, the general rapid extraction method of copper tube or copper mold can quench less melt, and the high-speed extraction process causes liquid The quenched structure produces deformation such as stretching, and at the same time, there are more liquid phases and less solid phases in the quenched melt, which makes subsequent analysis more difficult.

The semi-solid rheological melt requires a uniform composition field and temperature field, so it is necessary to perform temperature tracking and melt quenching on all parts of the melt at the same time, and the current melt quenching methods cannot meet the requirements.

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