A method for preparing metal thin-walled microtubes

A technology of thin metal and micro-tubes, which is applied in metal processing equipment, manufacturing tools, forming tools, etc., can solve the problems of unfavorable processing of dimensional precision pipe fittings, difficulty in meeting the forming requirements of metal thin-walled micro-tubes, etc., to avoid the possibility of workpiece fracture, The effect of high concentricity and reduced scrap rate and defective rate

CN103331582BInactive Publication Date: 2015-11-25YANGZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-11-25
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[0030] The present invention will be further explained below in conjunction with the specific implementation of examples.

[0031] A method for preparing metal thin-walled microtubes, comprising the steps of:

[0032](1) Pretreatment: The metal raw material is processed by severe plastic deformation to obtain a microstructure with ultra-fine grains, so that the metal material has as high a plasticity as possible, so as to fully refine the grain and reduce the intermediate phase size, reducing the anisotropy of the material; depending on the processed material, the limit values ​​of the parameters of the severe plastic deformation are different, but the superplastic deformation conditions are met;

[0033] (2) Billet making: The raw material pretreated by severe plastic deformation is press-processed and machined to make a round tube-shaped rough billet, and then the rough tube billet is finely ground on a precision grinder to form a fine tube billet; the fine tube billet One ...