Method for device for forming metal micro-thixotropy in semi-solid state assistant by supersonic vibration

Abstract

The invention discloses a method for the micro-thixotropy and molding of semisolid metal through the assistance of supersonic vibration. The lower end of a lower mould is provided with an electric heater of the lower mould; the lower mould is connected with a supersonic amplitude transformer; the lower mould is provided with a thermocouple of the lower mould; the upper end of a punching head is connected with an upper mould; the upper end of the upper mould is provided with an electric heater of the upper mould; the upper mould is connected with a pressure lever; and the upper mould is provided with a thermocouple of the upper mould. A semisolid metal blank material is remelted and heated to a solid-liquid coexisting region and is subjected to pressure machining; at the same time, supersonic vibration is applied to reduce friction and micro-molding resistance between the semisolid metal blank material and a micro-mould, strengthen the fluidity of the semi-solid metal material, improve the filling performance of the semisolid metal material in the micro-mould, and achieve good micro-molding effect. The method promotes the micro-thixotropy and molding of the semisolid metal, improves the efficiency of micro-molding, reduces equipment cost, avoids the disadvantages of hole contraction and the like in micro-machining process and improves the effects of micro-thixotropy and molding of the semisolid metal.

Description

technical field [0001] The invention relates to metal material microprocessing technology, in particular to an ultrasonic vibration-assisted semi-solid metal microthixotropic deformation method and device. Background technique [0002] In the early 1970s, scientists from the Massachusetts Institute of Technology discovered the rheological properties of semi-solid metals in experiments for the first time, and developed metal semi-solid forming technology, which is between solid metal forming and liquid metal forming. Combining the advantages of casting and plastic forming technology, it has significant advantages such as high efficiency and energy saving. Many scholars call it one of the most promising near-net shape technologies in the 21st century. Nowadays, scholars at home and abroad have carried out a lot of research work on semi-solid metal forming. The semi-solid processing technology of aluminum alloy and magnesium alloy is becoming more and more mature, and its resea...

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Problems solved by technology

The inherent advantages of semi-solid forming determine that semi-solid forming technology has the potential to be applied to the preparation of tiny parts, and it is expected to solve the problems of high cost and low efficiency that currently exist in microstructure processing technology, and provide a high-volume low-cost production of microstructure. A new method, however, so far semi-solid microforming technology is still rarely reported in the world

In 2004, Steinhoff et al. in the Netherlands first proposed the concept and method of micro-semi-solid forming (also known as: micro-thixoforming, Micro-Thixoforming) on ​​pages 611-619 of Volume 75 of the magazine Steel Research International, but So far there is no further report on the research and application of this technology

[0007] (1) During the microthixotropic forming process of semi-solid metal, the forming effect is not stable enough, and the forming consistency of some of the same structural features in the same processing process is not good enough;

[0008] (2) There are still problems such as shrinkage cavity and non-dense grain structure in the semi-solid metal microthixotropic deformation structure, and the microstructure morphology of the manufactured workpiece also needs to be improved;

[0009] (3) The processing efficiency and energy consumption of semi-solid metal microthixotropy still need to be improved

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