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Thermal shaping method and device of high-strength sharp-corner square rectangular tube

A square and rectangular tube, hot-shaping technology, applied in rolling mill control devices, metal rolling, manufacturing tools, etc., can solve the problems of inability to complete high-strength sharp-angled square and rectangular tubes, uneven inner and outer corners, and reduced elongation, etc. Achieve the effect of improving work hardening, fast heating and increasing elongation

Inactive Publication Date: 2015-12-02
上海宝钢型钢有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the increase in demand for high-strength square and rectangular tube products, the requirements for the strength, size and fillet accuracy of square rectangular tubes are also getting higher and higher. There are many problems, such as uneven internal and external bending angles and prone to collapse; the elongation rate is significantly reduced; at the same time, its yield ratio is high, that is, the forming range is relatively small, especially the forming of sharp-edged square rectangular tubes, which is prone to cracking
Therefore, it is almost impossible to produce high-strength sharp-edged square rectangular tubes by traditional roll forming technology.

Method used

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  • Thermal shaping method and device of high-strength sharp-corner square rectangular tube
  • Thermal shaping method and device of high-strength sharp-corner square rectangular tube

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Experimental program
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Effect test

Embodiment 1

[0051] Pre-bend the high-strength steel plate (the material is QSTE700) into a preformed square rectangular tube with a fillet radius R=6mm (such as Figure 5 As shown), its size is 40.0×40.0×2.0mm; 2) At a feed rate of 10m / min, the fillet part of the preformed square and rectangular tube is rapidly heated to 600°C; 3) After hot extrusion and shaping, the obtained The size is 38.0×38.0×2.0mm, and the inner sharp angle square rectangular tube, its structure is as follows Image 6 shown.

[0052] After testing, for the QSTE700 material, the elongation rate is only 9% when cold-formed; however, the elongation rate at the bend angle returns to the raw material performance after thermal shaping in this embodiment, and the elongation rate reaches 20%.

Embodiment 2

[0054] Pre-bend the high-strength steel plate (QSTE700 material) into a pre-formed square rectangular tube with a fillet radius R=6mm (such as Figure 5 As shown), its size is 40.0×40.0×2.0mm; 2) At a feed rate of 10m / min, the fillet part of the preformed square and rectangular tube is rapidly heated to 800°C; 3) After hot extrusion and shaping, the obtained The size is 37.5×37.5×2.0mm, and the outer sharp corner square rectangular tube, its structure is as follows Figure 7 shown.

[0055] After testing, the elongation is only 5% when cold-bending; however, the elongation of the corner returns to the raw material properties after heat shaping in this embodiment, and the elongation reaches 18%.

[0056] It can be seen from the above that, compared with the cold-bending process, the work-hardening phenomenon of the square and rectangular tube of the present invention is reduced, the residual stress is reduced, and the elongation is greatly improved.

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Abstract

The invention relates to a thermal shaping method and device of a high-strength sharp-corner square rectangular tube. The method comprises the following steps: pre-bending a high-strength steel plate into a pre-shaped square rectangular tube whose corner radius R is 4-10mm by using a cold bending shaping method, sending the pre-shaped square rectangular tube into an induction heating coil and locally heating the four bend-corner parts of the pre-shaped square rectangular tube at the heating temperature of 500-1050 DEG C; after heating, sending the pre-shaped square rectangular tube into a first pass roller pass, extruding out a sharp-corner square rectangular tube; sending the sharp-corner square rectangular tube into a second shaping pass to perform the second thermal shaping and eliminate redundant deformation. The square rectangular tube with the inner sharp corners or outer sharp corners can be prepared, the residual stress on the corners is reduced, the elongation rate is increased, and cracking phenomenon caused by processing hardening is avoided.

Description

technical field [0001] The invention belongs to the field of hot extrusion forming, and in particular relates to a method and device for hot shaping of a high-strength sharp-angled rectangular tube. Background technique [0002] High-strength square rectangular tube is a closed section steel with a wide range of uses. Compared with round tubes with the same cross-sectional area, it has the advantages of high strength, large flexural section modulus, easy assembly, stability and beauty, and is widely used in vehicles. , construction and other industries, especially in the bus frame and architectural decoration, high-strength square rectangular tubes have become more and more eye-catching products in the world steel market. [0003] With the increase in demand for high-strength square and rectangular tube products, the requirements for the strength, size and fillet accuracy of square rectangular tubes are also getting higher and higher. Such problems, such as uneven internal ...

Claims

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Application Information

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IPC IPC(8): B21C37/06B21B19/10B21B37/78
CPCB21C37/065B21B19/10B21B37/78
Inventor 晏培杰马越峰李丹阳邓金春韩静涛彭雪峰
Owner 上海宝钢型钢有限公司
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