Method of manufacturing ultrathin wall metallic tube by cold working method
A technology of ultra-thin wall and metal pipe, which is applied in the direction of metal rolling, etc., and can solve the problems of high cost, increased drawing times, and easy fracture of the pipe
Inactive Publication Date: 2008-05-21
SUMITOMO METAL IND LTD
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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, the drawing with a large wall thickness reduction rate needs to increase the number of times of drawing and repeat the drawing operation, and each drawing needs to be lubricated, resulting in high cost
Method used
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Embodiment
[0039] In order to confirm the effect of the method of producing ultra-thin metal pipes by the cold rolling method and the cold drawing method of the present invention, the following tests were carried out, and the test results were evaluated. In addition, since the functions and effects in the case of mandrel stretching are basically the same as those in the case of plug stretching, plug stretching will be described in this embodiment.
[0040] Example 1 of the present invention
[0041] The 18%Cr-8%Ni stainless steel pipe with an outer diameter of 34.0mm and a wall thickness of 3.5mm manufactured by the Mannesmann mandrel seamless pipe mill process was used as a sample pipe blank, and it was processed by a pilger cold rolling mill. Expanding rolling was carried out so that the outer diameter was 50.8mm and the wall thickness was 1.3mm.
[0042] The test conditions and results are summarized as follows.
[0043] Conical mandrel diameter: dm: 26.0~47.2mm
[0044] Feed: f=...
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Abstract
Methods of manufacturing an ultrathin wall metallic tube by cold working method capable of providing a marvelous wall thickness reduction. In the method of manufacturing the metallic tube by a cold pilger rolling mill, a raw tube is cold-worked while being enlarged in diameter by using rolls having tapered hole dies with a diameter increasing from the engaging inlet side to the finishing outlet side of the rolls and a tapered mandrel having a diameter increasing from the engaging inlet side to the finishing outlet side. In the method of manufacturing the metallic tube by using a stretcher mill, a raw tube is cold-stretched while being enlarged in diameter by using a solid die with a diameter increasing from the engaging inlet side to the finishing outlet side of the rolls and a plug or a tapered mandrel with a diameter increasing from the inlet side to the outlet side of the die. In the method of manufacturing the metallic tube, the maximum finished diameter of the plug or the tapered mandrel may be larger than the outer diameter of the raw tube.
Description
technical field [0001] The present invention relates to a cold working method of a metal pipe, and in particular provides a method for manufacturing an ultra-thin metal pipe by a cold working method which greatly expands the manufacturable range of the thin wall of the metal pipe. Background technique [0002] When the metal pipe cannot meet the quality, strength or dimensional accuracy requirements in the hot-worked state, 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. [0003] In the cold rolling method using a pilger cold rolling mill, between a pair of rolls having a tapered pass whose diameter gradually decreases in the circumferential direction, and a tapered mandrel that also gradually decreases in diameter but only in the length direction The tube billets are reduced in diameter and rolled. Th...
Claims
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IPC IPC(8): B21B21/00B21C1/22
Inventor 林千博
Owner SUMITOMO METAL IND LTD