Method for manufacturing finned square rectangular steel tube

A manufacturing method, square and rectangular technology, applied in the field of column forming and welding, can solve the problems of difficult induction heating and difficult welding control

Active Publication Date: 2013-09-25
HANKOU STEEL ROLLING MILL WUHAN IRON & STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the particularity of welding, the above forming and welding methods cannot be used, and only asymmetrical forming and the butt joint method of one side (welding side) end face of the strip steel and the other side (winged side) surface plate part can be used for welding. Some induction heating is difficult, and welding is difficult to control

Method used

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  • Method for manufacturing finned square rectangular steel tube
  • Method for manufacturing finned square rectangular steel tube
  • Method for manufacturing finned square rectangular steel tube

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Experimental program
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Effect test

Embodiment Construction

[0027] The production process flow of the present invention: edge trimming→cold bending primary forming→four-roll extrusion→welding→outer burr planing→sizing and shaping→flying saw sawing→collection and packing into storage.

[0028] figure 1 It is a schematic diagram of an embodiment of the present invention:

[0029] Plate 1 thickness t=6mm, H1=115, H2=100, B=100, R=12~15, two bottom angles are right angles, upper right angle γ=80°±5°. 1a is a winged edge, 1b is a welded edge, 1c is a waist edge, and 1d is a welded point.

[0030] The manufacturing steps are as follows:

[0031] 1) Trim the inner corner of the welding edge of the plate 1: trimming angle Φ = 45° ± 2°, leaving root h = 1 / 2 thickness of the plate ± 0.5mm; figure 2 : 2 is a trimming knife. Trim the inner angle of the welded end face of the plate 1, so that the inner angle of the welded end face and the winged edge after bending has a welding gap of Φ=45°±2°, so as to ensure the welding quality.

[0032] 2)...

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Abstract

The invention provides a method for manufacturing a finned square rectangular steel tube. The method comprises the following steps: (1) carrying out trimming on the inner angle of the end face of a welding edge, wherein the trimming angle phi is 45+ / -2 degrees, and the trimming left root h meets the equation: h=1 / 2 thickness of a plate+ / -0.5mm; (2) carrying out pre-profiling of cold bending on strip steel through a die, and forming the shape and corresponding size of a product preliminarily; (3) carrying out extruding welding through four rollers: using an upper extrusion roller, a lower extrusion roller, a left extrusion roller and a right extrusion roller for extrusion, and bending a side extrusion roller of a finned edge by 3-6 degrees for carrying out high-frequency welding on the end face of the welding edge and the surface of the inner side of the finned edge; (4) planning welding burrs: planning outer burrs through an arc blade and avoiding the finned edge, and regulating the angle of a planer tool until the included angle alpha 1 between the planer tool and the vertical direction of the finned edge is 6 degrees, wherein the angle alpha 2 of the bottom of a planer tool is 18 degrees; (5) carrying out sizing shaping: when the four rollers are sized and shaped in an extrusion mode, bending the side extrusion roller of the finned edge by 2-3 degrees, and enabling the angle of the finned edge to meet the standard requests. The product produced through the method is good in shape of the cross section, good in surface quality, free of scratch, good in planeness, and stable and qualified in welding.

Description

technical field [0001] The invention relates to a manufacturing method of a square rectangular steel pipe with fins, which belongs to the forming and welding method applied to the column of a special container. Background technique [0002] Side plate welded square rectangular steel pipe with fins, also known as end plate assembly column, is applied to the column part of special containers. [0003] The forming and welding methods of ordinary cold-formed closed products are as follows: among them, square rectangular tubes and round tubes are symmetrically formed and welded. The forming and welding methods are relatively simple and easy to control; pointed square rectangular tubes are asymmetrically formed and welded , its forming and welding are relatively difficult; but no matter which method is used, the welding of the above types of products adopts the end-to-end method of both sides of the strip steel, which conforms to the characteristics of induction welding of high-fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
Inventor 朱成松朱少文阮建刚盛珍剑万业成张尧
Owner HANKOU STEEL ROLLING MILL WUHAN IRON & STEEL CORP
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