Method for preparing metal thin-wall microtubes

Abstract

The invention discloses a method for preparing metal thin-wall microtubes. The method includes the steps of material pretreatment, blank manufacture and female die stretching. Tube blanks are fixed in a female die, the tube walls are extruded by a die core which moves on the inner sides of the tube blanks, so that the purpose of reducing the thickness of the tube walls is reduced. The wall thickness of the tube blanks can be continuously thinned by replacing the die core, and then the metal tubes with the thin walls are prepared. The method of severe plastic deformation is adopted to treat materials, so that ultra-fine grained microscopic structures are acquired, and then the deformability of the materials is improved. On the basis, a novel female die stretching technology is adopted, namely the tube blanks are placed in the female die, the overall dimension of the tube blanks is limited, and the die core moves inside the tube blanks, so that the wall thickness of the tube blanks is reduced and generally reaches the needed dimension, then tube stocks are straightened, polished, and eventually finished products are acquired. The method for preparing the metal thin-wall microtubes has the advantages of being high in machining accuracy and yield.

Description

technical field [0001] The invention discloses a method for preparing a metal thin-walled pipe, which belongs to the technical field of metal pipe preparation. Background technique [0002] Metal thin-walled microtubes usually refer to tubes with an outer diameter of less than 5 mm, and are widely used in electronics, machinery, medical, robotics and other fields. The traditional metal pipe forming methods mainly include drawing, extrusion and rolling, etc. These methods have good forming effects for metal materials with good plasticity such as steel, aluminum alloy, copper alloy, etc., but for difficult-to-process metals , It is difficult to form when processing such as magnesium alloy. Superplastic forming is an important method for forming difficult-to-deform metal materials. Superplastic deformation refers to the phenomenon that the elongation increases significantly and the deformation resistance decreases significantly when the metal material is deformed at a higher t...

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Problems solved by technology

[0003] Although superplastic deformation can increase the strain of the material during the deformation process, it is found in previous studies that it is still difficult to meet the

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