Method for making printed angle rectangle section steel pipe

A technology of rectangular steel pipe and sharp corners, applied in the field of manufacturing rectangular steel pipes with sharp corners, can solve the problems of large twisting moment, large welding energy consumption, poor welding quality, etc., and achieves easy adjustment operation, uniform current density, and forming error. small effect

Inactive Publication Date: 2002-07-17
TIANJIN HUAIHAI COLD BEND PROFILE STEEL
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  • Abstract
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Problems solved by technology

However, this method has the following disadvantages: First, the method adopts eccentric cold-bending forming, and the deformation moment is unbalanced. The strip steel is always in a metastable state and the twisting moment is large, which makes the adjustment operation difficult, and the deformation accumulation error is large, and the final geometric accuracy of the forming The guarantee is poor, and it needs a lot of power to complete t

Method used

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  • Method for making printed angle rectangle section steel pipe
  • Method for making printed angle rectangle section steel pipe
  • Method for making printed angle rectangle section steel pipe

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] The method of the present invention will be described in further detail below in conjunction with the embodiments given in the accompanying drawings.

[0010] Made as figure 1 The process of the pointed rectangular steel pipe shown is as follows:

[0011] a. Determine the required strip width and the specific dimensions of each side according to the cross-sectional geometric dimensions of the rectangular tube.

[0012] b. If figure 2 As shown, determine the node positions of the rectangular tube side (2) and side (3), adjust the position of the rolls in each pass so that the roll centerline (that is, the rolling centerline (0-0)) and the side (2), side The nodes of (3) coincide.

[0013]

Deformation pass

Edge (1) and Edge (2)

angle of

Edge (2) and Edge (3)

angle of

Edge (3) and Edge (4)

angle of

Edge (4) and Edge (1)

angle of

F1

159°

172°

159°

F2

...

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Abstract

The method for manufacturing rectangular pipe with sharp corner is characterized by that it uses rolling central line as a diagonal line of formed pipe to make multiple-pass cold-bending symmetrical deformation so that two side ends of steel strip which are made into oblique end face are finally closed on the rolling central line so as to form included angle with 90 deg. of said rectangular pipe. Said method is easy to regulate and operate, small in formed error, weld seam and two side are in symmetrical state, so that its welding effect is good, and its energy consumption also can be reduced.

Description

technical field [0001] The invention relates to a method for manufacturing rectangular steel pipes by cold bending, in particular to a method for manufacturing rectangular steel pipes with sharp corners. Background technique [0002] The upper side beam of the China Railway Freight Open Car is a rectangular steel pipe with a bending angle of R≤7 in cross section, usually called a sharp-angled rectangular steel pipe. In the past, it was made of butt-welded hot-rolled channel steel. Due to various quality deficiencies, the current industry standard has changed it to use cold-formed steel products. The production plant that has now is 93104319.0 by Chinese patent number, " a kind of method for manufacturing pointed square tube " produces this product. However, this method has the following disadvantages: First, the method adopts eccentric cold-bending forming, and the deformation moment is unbalanced. The strip steel is always in a metastable state and the twisting moment is ...

Claims

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Application Information

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IPC IPC(8): B21C37/08B21D5/00
Inventor 江岩张长发关世杰
Owner TIANJIN HUAIHAI COLD BEND PROFILE STEEL
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