Method for manufacturing ultrathin-wall metal tube by using cold drawing method

Abstract

The invention provides a method for manufacturing an ultrathin-wall metal tube by using a cold drawing method. In the method, metal tubes are manufactured by adopting a broaching machine, an integral die with the constant drawing die diameter from a meshing inlet side to a processing outlet side and a top or conical core bar with the diameter gradually increasing from the inlet side of the integral die to the processing outlet side are adopted, and the metal tube is drawn by increasing the wall-thickness central diameter of the tube and reducing the wall thickness so as to remarkably reduce the wall thickness.

Description

[0001] This application is a divisional application of an invention patent application with an application date of February 01, 2008, an application number of 200880000300.2, and an invention title of a method for manufacturing ultra-thin-walled metal pipes by drawing method. technical field [0002] The present invention relates to a cold drawing method of a metal pipe, and in particular provides a method for manufacturing an ultra-thin metal pipe by the cold drawing method, which greatly expands the manufacturable range of the thin wall of the metal pipe. Background technique [0003] When the metal pipe cannot meet the quality, strength or dimensional accuracy requirements in the state of hot working, it must be sent to the cold working process. As the cold working process, there are usually a cold drawing method using a die and a plug, or a die and a mandrel, and a cold rolling method using a Pilger cold rolling mill. [0004] In the cold drawing method, the diameter of ...

AI Technical Summary

Problems solved by technology

Of course, the thinner the wall thickness of the tube, the greater the tensile stress in the length direction, and the easier it is for the tube to break. Therefore, the wall thickness reduction rate is naturally limited.

Therefore, in the drawing with a large wall thickness reduction rate, it is necessary to increase the number of times of drawing and repeat the drawing operation, and each drawing requires lubrication work, resulting in high cost.

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