Continuous roller type cold bending forming method for sharp-angled rectangular tube

A technology of cold forming and rectangular tubes, which is applied in the field of metal material pressure processing, can solve the problems of poor pressure control, insufficient stability, and poor welding quality, and achieve high forming accuracy, improved forming accuracy, and stable forming. Effect

Inactive Publication Date: 2017-04-26
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The sharp-angled rectangular tube is used for the upper side beam of railway freight cars in China. So far, some manufacturers produce this product according to the patent number 021036039, "A Method for Manufacturing Sharp-angled Rectangular Steel Tube", but this method has the following disadvantages:...

Method used

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  • Continuous roller type cold bending forming method for sharp-angled rectangular tube
  • Continuous roller type cold bending forming method for sharp-angled rectangular tube
  • Continuous roller type cold bending forming method for sharp-angled rectangular tube

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A continuous roll-type cold-bending forming method for a pointed rectangular tube, specifically comprising the following steps:

[0041] (1) Feed the strip steel billet into the first frame of the cold roll forming unit, then bend side a upwards and form a 9-14° angle with the horizontal bottom line, keep side b horizontal, and bend side d upwards and meet the horizontal bottom line at the same time It is 12-17°, and then enters the next process.

[0042] (2) Send the strip steel deformed by the first pass into the second frame, continue to deform on the basis of the first pass, bend side a upwards and form 21-26° with the horizontal bottom line, and keep side b At the same time, bend the d side upwards and form a 26-31° angle with the horizontal bottom line, and then enter the next process.

[0043] (3) Send the strip deformed by the second pass into the third rack, bend side a upwards and form a 36-41° angle with the horizontal bottom line, keep side b horizontal, an...

Embodiment approach 1

[0053] The steel strip in this embodiment is a hot-rolled coil with a width of 468.74 mm, a thickness of 6 mm, and unlimited length after slitting, and the brand name is 09CuPTiRE-A.

[0054] as attached figure 2 ~ attached Figure 12 shown

[0055] The first pass to the third pass: mainly the part of the left side (a side) and the top side (d side) is formed, and the bending angle of the left side (a side) is: 11 ° - 23 ° - —38°; the bending angles of the top edge (d side) are: 14°—28°—46°.

[0056] The 4th pass to the 7th pass: mainly the part of the left side (a side) and the right side (c side) is formed, and the bending angle of the left side (a side) is: 53 ° - 68 ° ——80°—88°; the bending angles of the right side (side c) are: 12°—27°—45°—66°; the top side (side d) is not bent.

[0057] The 8th pass: mainly the partial molding of the top side (d side), the top side (d side) is bent upwards and forms 105° with the c side, and the left side (a side) and right side (c ...

Embodiment approach 2

[0062] The steel strip in this embodiment is a hot-rolled coil with a width of 468.74 mm, a thickness of 6 mm, and unlimited length after slitting, and the brand name is 09CuPTiRE-A.

[0063] as attached figure 2 ~ attached Figure 12 shown

[0064] The first pass to the third pass: mainly the part of the left side (a side) and the top side (d side) is formed, and the bending angle of the left side (a side) is: 9 ° - 21 ° - —36°; the bending angles of the top edge (d side) are: 12°—26°—49°.

[0065] The 4th pass to the 7th pass: mainly the part of the left side (a side) and the right side (c side) is formed, and the bending angle of the left side (a side) is: 51 ° - 66 ° ——78°——89°; the bending angles of the right side (side c) are: 10°—25°—43°—69°; the top side (side d) is not bent.

[0066] The 8th pass: It is mainly the partial molding of the top edge (d edge), the top edge (d edge) is bent upwards and forms 108 with the c edge, and the left edge (a edge) and the right...

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Abstract

The invention discloses a continuous roller type cold bending forming method for a sharp-angled rectangular tube, and belongs to the technical field of metallic material press working. The method comprises a method that a band steel blank is subjected to bending deformation through rollers pass by pass, and a welding process for the sharp-angled rectangular tube. The production processes comprise coiling, flattening, shearing and butt welding, forming pass by pass, welding, finishing, straightening and sawing. The first seven passes adopt closed hole bending forming, and transverse displacement of the blank in the production process is limited, so that the machining precision is improved, the blank is bent by a certain angle pass by pass, subjected to multi-pass bending forming, heated to the liquid-phase offline semi-molten temperature through high-frequency induction before welding and subjected to up-down-pressing one-pass pressure welding. The continuous roller type cold bending forming method has the advantages of being high in production efficiency, stable in quality and good in forming effect.

Description

technical field [0001] The invention relates to a continuous roll-type cold-bending forming method for a sharp-angled rectangular tube, which belongs to the technical field of metal material pressure processing. Background technique [0002] The sharp-angled rectangular tube is used for the upper side beam of railway freight cars in China. So far, some manufacturers produce this product according to the patent number 021036039, "A Method for Manufacturing Sharp-angled Rectangular Steel Tube", but this method has the following disadvantages: In the forming process, the rolling center line is used as the diagonal line to bend and form, the stability is not high enough, resulting in insufficient forming accuracy, and in the welding process, the welding is performed at a 45° angle, the pressure control is not good, and the welding quality is not good. Contents of the invention [0003] The purpose of the present invention is to overcome the disadvantages of the above methods a...

Claims

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Application Information

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IPC IPC(8): B21C37/08
CPCB21C37/0803B21C37/0815
Inventor 王华昆陈兴旺
Owner KUNMING UNIV OF SCI & TECH
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