Method for producing a large steel tube

一种钢管、管子的技术，应用在制造钢管领域，能够解决管体不利应力状态、材料损伤、管道顶锻强度断裂稳定性降低等问题

Inactive Publication Date: 2011-05-11
EISENBAU KRAMER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During this process, unfavorable stress states are of course created in the pipe body, and the upsetting strength and thus the fracture stability of the pipe may thus be reduced
In coated pipes (e.g. CLAD pipes), damage to the material can also occur, so that the pipes produced in this way often cannot be finished

Method used

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  • Method for producing a large steel tube
  • Method for producing a large steel tube
  • Method for producing a large steel tube

Examples

Experimental program
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Embodiment Construction

[0020] figure 1 Shows a top axial view of a tube 1 of circular cross-section having an inner diameter r i and outer diameter r a and the wall thickness t determined by the difference between the inner and outer diameters. The pipe 1 has a longitudinally extending weld seam 2 . There are mechanically or thermally stressed regions 3, 3' in the tube wall as a result of the mechanical forming process and as a result of the thermal action during welding.

[0021] Shaping machine or shaping device 10 has a plurality of shaping punches that are uniformly distributed along the circumferential direction and arranged at the same position in the axial direction, and the shaping punches have respective shaping shell molds 11, 12, 13, 14, which can be replaced are installed on the respective brackets 15, and are provided with a surface shape that matches the surface profile of the pipe 1 and extends along the surface of the pipe in the circumferential direction on its side facing the pi...

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Abstract

The invention relates to a method for producing a steel tube, wherein a steel sheet (4) is formed into tubular body (1.2) having a round cross section in a bending process (a), welded in a subsequent welding process (b) along the longitudinal edges facing each other for producing a continuous longitudinal seam, and then subjected to a stress-relieving treatment. The production quality is improved, with reduced production time, in that the stress-relieving treatment is performed in a process (c) for concentrically truing along the circumference in at least one segment relative to the longitudinal axis thereof, while cold forming by compression. The mechanical technological properties of the material are also thereby improved.

Description

technical field [0001] The present invention relates to a method for manufacturing steel pipes, in which a plate or coil is formed into a pipe body with a circular cross-section in a bending process, and in the subsequent welding process, in order to form a continuous The weld seams are welded along the longitudinal edges facing each other, and then stress relieved. Background technique [0002] A method of this type is described in DE102006010040B3. In this known method, the tube is extruded by means of a shaping machine on the outer circumference by means of a plurality of shaping punches for circular shaping offset in the circumferential direction and arranged at the same position in the axial direction, wherein The shaping punch supports a shaping shell mold matching the outer section of the pipe. The shaping shell molds can be driven individually or in relation to each other, for example hydraulically, and can be operated in a controlled or regulated manner. By adjus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/08B21D3/10B21D5/10
CPCB21C37/0807B21C37/30B21D5/10B21D3/10B21D5/14
Inventor 乔切姆·贝塞尔西罗·雷切尔
Owner EISENBAU KRAMER
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