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Manufacturing method for ultrathin seamless metal pipe utilizing floating plug

一种无缝金属管、超薄壁的技术，应用在金属拉拔的成型工具、金属拉丝、制造工具等方向，能够解决成本升高、增加拉拔次数等问题，达到效率实现、扩大可制造范围的效果

Inactive Publication Date: 2011-11-02
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in the drawing process in which the wall thickness reduction rate becomes large, it is necessary to increase the number of times of drawing and repeat the drawing work, and the lubrication work is required each time, resulting in an increase in cost

Method used

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  • Manufacturing method for ultrathin seamless metal pipe utilizing floating plug
  • Manufacturing method for ultrathin seamless metal pipe utilizing floating plug
  • Manufacturing method for ultrathin seamless metal pipe utilizing floating plug

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Experimental program
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Effect test

Embodiment

[0055] In order to confirm the effect of the method of manufacturing the ultra-thin seamless metal pipe obtained by the diameter-expanding drawing method using the floating plug of the present invention, the following tests were conducted and the results were evaluated. The test is using the above Figure 4 The method shown in (a) is carried out, but for the Figure 4 (b) and (c) of the method, and the Figure 4 The action and effect of the method of (a) are almost unchanged, therefore, in this embodiment, the Figure 4 Experimental results of the method of (a).

[0056] The 18%Cr-8%Ni stainless steel tube with an outer diameter of 48.6mm, an inner diameter of 41.6mm, and a wall thickness of 3.5mm manufactured by the Mannesmann mandrel rolling process was used as the tube blank for the test. The die and the floating plug formed the tube blank for the test with an outer diameter of 53.8mm, an inner diameter of 50.8mm, and a wall thickness of 1.5mm while expanding the diamete...

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Abstract

Proposed is a method for manufacturing an ultrathin metal pipe using a cold drawing method, by which the manufacturable range of thin sides in metal pipes can be expanded drastically. In a diameter-expanding drawing method, an inlet-side solid die, the diameter of which increases, is constant, or decreases from the engaging inlet side to the finishing outlet side, and an outlet-side solid die, the diameter of which decreases at least near the engaging inlet, are arranged in opposition connected on the same pass line; a tapered plug, the diameter of which increases from the engaging inlet side toward the finishing outlet side, is floated over the pass line; a raw pipe between the solid dies and the plug is made thinner while the thickness mean diameter is increased in the region of the inlet-side solid die; and the outer diameter is reduced by pressure and the tapered plug is floated in the region of the outlet-side die. The method offers great economic advantages, since it is possible to manufacture ultrathin seamless metal pipes and long pipes, and since process rationalization can be realized in terms of yield and efficiency.

Description

technical field [0001] The present invention relates to a cold drawing method of an ultra-thin-walled seamless metal pipe, which adopts a diameter-expanding drawing method using a floating plug, and in particular provides a method that significantly expands the manufacturable range of the thin-walled metal pipe and seeks Elongated, ultra-thin-walled seamless metal tubes are produced efficiently. Background technique [0002] When the metal pipe does not meet the quality, strength or dimensional accuracy requirements in the hot working state, it is sent to the cold working process. As the cold working process, there are a cold drawing method using a monolithic die and a plug or a monolithic die and a mandrel, and a cold rolling method using a Pilger cold rolling mill, and the present invention relates to the cold drawing method among them. [0003] In the cold drawing method, the diameter of the tube end of the blank tube is reduced by a necking machine, the scale on the sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C1/22B21C1/28B21C3/16
CPCB21C1/22B21C1/24B21C3/16B21C3/00B21C1/28
Inventor 林千博
Owner NIPPON STEEL CORP
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