Continuous rheological extending forming method for preparing Al alloy tube

Abstract

The invention relates to a continuous rheological extension forming method used for preparing an aluminium alloy pipe. The invention adopts a continuous extension forming device which mainly consists of a water cooling rotation roller, a fixed shoe plate, an extrusion forming die, a back pressing block and a base. The key point is that the invention is achieved by the steps that the chemical ingredients of the invention are 0.8% of an Mg, 0.7% of a Si, less than or equal to 0.1% of total impurity, and an Al with the residual quantity according to the mass percentage; a melting furnace is pre-heated to 700 DEG C when an aluminium ingot is added; an Al-Si master alloy is added when the temperature is 760 DEG C; the Mg is pressed into the melting body when the temperature is reduced to 720 DEG C; a refining is achieved by a hexachloroethane when the temperature is increased to 740 DEG C; after that, the melting body is covered and the temperature is increased and kept at 760-800 DEG C; finally, the aluminium alloy pipe is prepared by the continuous extension forming device of the melting body. The pipe tissue is uniform and fine; the tensile strength of T6 state is 300MPa, the elongation thereof is 10% and the equivalent conductivity is 54.38IACS. The invention has the advantages of high efficiency, saving energy, short process flow and fast effect. The product of the invention becomes the conductive material which is urgently required by power industry.

Description

technical field [0001] The invention relates to a method for preparing an aluminum alloy tube, in particular to a method for preparing an aluminum alloy tube by continuous rheological expansion forming. technical background [0002] Metal semi-solid short-process forming technology is an important topic in the field of new material science, which meets the requirements of sustainable development of the national economy. Metal semi-solid forming breaks through many disadvantages of metal forming in the traditional liquid or solid range. It is a highly efficient and energy-saving near-net-shape new technology. It is known as the most promising green industrial technology in the 21st century. Countries around the world have invested a lot of manpower Material research. In 1971, Professor Flemings of the Massachusetts Institute of Technology first proposed the metal semi-solid forming technology. At present, many patented technologies have been commercialized on a large scale ...

AI Technical Summary

Problems solved by technology

In the early 1980s, my country carried out research on semi-solid forming technology and achieved many research results, but there is still a certain gap compared with foreign advanced levels, and industrial applications are still immature

[0005] The Kiuchi Research Laboratory of the University of Tokyo in Japan is at the advanced level in the field of semi-solid material preparation by single-roll shear cooling. In 1998, they proposed the preparation of semi-solid metal slurry by single-roll shear cooling based on continuous casting extrusion technology, and successfully prepared the microstructure and properties. Excellent semi-solid metal paste, but no further research has been done on continuous forming of this technology

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