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Small-diameter-thick-ratio cold-drawn coiled-welded steel pipe and combined rotating die-drawn coiled pipe equipment

A technology of diameter-thickness ratio and steel pipe, which is applied in the field of small-diameter-thickness ratio cold drawn coiled welded steel pipe and combined rotating die drawing coiled pipe equipment, can solve the problems of high defect probability and high difficulty, and achieve the effect of reducing forming defects

Active Publication Date: 2016-08-24
ZHEJIANG CTB WAVEFORM STEEL WEB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the disadvantages of the prior art that it is very difficult to make a welded steel pipe with a small diameter-thickness ratio from a steel plate, and the defect probability is high when the corner is formed. The compressive stress is basically offset, and the internal compressive stress is multiplied, which can reduce the forming defects of the fibrous cracks caused by the tensile shape on the outside of the steel plate

Method used

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  • Small-diameter-thick-ratio cold-drawn coiled-welded steel pipe and combined rotating die-drawn coiled pipe equipment
  • Small-diameter-thick-ratio cold-drawn coiled-welded steel pipe and combined rotating die-drawn coiled pipe equipment
  • Small-diameter-thick-ratio cold-drawn coiled-welded steel pipe and combined rotating die-drawn coiled pipe equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Small diameter thickness ratio cold drawn coil welded steel pipe, such as Figure 1 to Figure 4 As shown, the outer diameter of the steel pipe 9 is D, the wall thickness of the steel pipe 9 is t, the diameter-thickness ratio of the steel pipe 9 is D / t≤21, and the wall thickness of the steel pipe 9 after the steel plate 8 is rolled is t≥4mm. Steel pipe diameter-thickness ratio D / t can be 21, 20, 19, 18, 17, 16, 15, 14, and the thickness of t can be 4mm, 5mm, 6mm, 7mm, 8mm.

[0024] After the steel plate is rolled into the steel pipe, the seam of the steel pipe is arranged along the longitudinal direction of the steel pipe, and the seam of the steel pipe is connected by welding. After the steel plate is rolled into the steel pipe, the width direction of the steel plate is rolled into the circumferential direction of the steel pipe, and the length direction of the steel plate is rolled into the length direction of the steel pipe. The steel plate width required by the trad...

Embodiment 2

[0031] The difference between this embodiment and Embodiment 1 lies in that the diameter-thickness ratio of the steel pipe is D / t≤13, the thickness t of the steel plate is greater than 8mm, and the steel pipe is rolled by steel plate. Steel pipe diameter-thickness ratio D / t can be 13, 12, 11, 10, 9, 8, and the thickness of t can be 8mm, 9mm, 10mm, 11mm, 12mm. Such as figure 1 As stated, the diameter of the outer wall of the steel pipe in the present invention is D, and the wall thickness of the steel pipe is t, wherein the steel pipe wall thickness in the compression zone is t1, and the steel pipe wall thickness in the tension zone is t2, and t1+t2=t, t1≥t2 .

[0032] After the steel plate is rolled into the steel pipe, the seam of the steel pipe is arranged along the longitudinal direction of the steel pipe, and the seam of the steel pipe is connected by welding. After the steel plate is rolled into the steel pipe, the width direction of the steel plate is rolled into the c...

Embodiment 3

[0037] The difference between this embodiment and Embodiment 1 is that: the diameter-thickness ratio of the steel pipe is D / t≤7, the thickness t of the steel plate is greater than 12mm, and the steel pipe is rolled by steel plate. Steel pipe diameter-thickness ratio D / t can be 7, 6, 5, 4, and the thickness of t can be 13mm, 14mm, 15mm, 16mm, 17mm.

[0038] Such as figure 1 As shown, the diameter of the outer wall of the steel pipe in the present invention is D, and the wall thickness of the steel pipe is t, wherein the steel pipe wall thickness in the compression zone is t1, and the steel pipe wall thickness in the tension zone is t2, and t1+t2=t, t1≥t2 , and t1≥0.75t.

[0039] The invention is suitable for defect-free forming with diameter-thickness ratio D / t≤21, especially for defect-free forming with diameter-thickness ratio D / t≤14, suitable for forming steel plates with a thickness of more than 4 mm, and especially suitable for wall thickness of 16 mm The above cold-draw...

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Abstract

The invention relates to a steel pipe and steel pipe manufacturing equipment, and discloses a cold-drawing roll-welded steel pipe with small diameter-thickness ratio and combined die rotating drawing type pipe rolling equipment. The cold-drawing roll-welded steel pipe with small diameter-thickness ratio is characterized in that the external diameter of a steel pipe (9) is D, the wall thickness of the steel pipe (9) is t, the diameter-thickness ratio (D / t) of the steel pipe (9) is not greater than 21, and the wall thickness of the steel pipe (9) coiled from a steel plate (8) is not less than 4mm. The equipment comprises a conveying roller device (1), a combined die rotating device (2) and a traction device, wherein the combined die rotating device (2) comprises more than one arc gears (21). According to the invention, the radial constraining formation method and the tunnel die rotating technology are adopted, so that the tensile stress on the outer side basically counteracts the pressure stress constrained by the length, the pressure stress on the inner side is multiplied, the formation defect that fibrous cracks are caused on the outer side of the steel plate due to stretching can be reduced, and the steel plate is secondarily reinforced due to multiplication of pressure on the inner side of the steel pipe.

Description

technical field [0001] The invention relates to steel pipes and steel pipe manufacturing equipment, in particular to cold-drawn coiled-welded steel pipes with a small diameter-thickness ratio and combined rotating die-drawn coiled pipe equipment. Background technique [0002] At present, the diameter-thickness ratio A refers to the ratio of steel pipe outer diameter D / steel wall thickness t. The smaller the diameter-thickness ratio D / t is, the more difficult it is to make the steel pipe. If the diameter-thickness ratio is A, the outer stretch of the coiled plate is Or the inner compression ratio is (A-1) / A, so the smaller the diameter-thickness ratio A=D / t, the larger the outer stretch ratio at the corner. It should be pointed out that the stretching and compression of steel plates also consume a lot of energy Energy, and defects are basically caused by a large amount of stretching, but compression can increase the secondary strengthening of the steel. Therefore, it is very ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C1/22B23P23/04
Inventor 孙天明曾勇
Owner ZHEJIANG CTB WAVEFORM STEEL WEB
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