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A method for setting the flattening amount of straightening rolls for super-large-diameter seamless steel pipes

A seamless steel pipe and super-large diameter technology, which is applied in the field of setting the flattening amount of the super-large diameter seamless steel pipe straightening roller, can solve problems such as unsatisfactory rounding effect, improve product straightening accuracy and reduce thread indentation , Improve the effect of ellipticity

Active Publication Date: 2021-08-10
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned technical problems of unsatisfactory straightening effect and unsatisfactory rounding effect of the traditional steel pipe multi-roller straightening machine, the present invention provides a high-precision, high-efficiency, easy-to-realize ultra-large-diameter seamless steel pipe straightening roller flattening measurement Setting method

Method used

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  • A method for setting the flattening amount of straightening rolls for super-large-diameter seamless steel pipes
  • A method for setting the flattening amount of straightening rolls for super-large-diameter seamless steel pipes
  • A method for setting the flattening amount of straightening rolls for super-large-diameter seamless steel pipes

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Effect test

Embodiment 1

[0039] The method for determining the flattening amount and distribution ratio of each pair of straightening rollers during the straightening process of large-diameter seamless steel pipe φ530*16 is as follows:

[0040] Firstly, the inner and outer diameter ratio of the steel pipe to be straightened is λ=0.955, the average section radius R=265mm, and the yield strength σ t =345MPa, elastic modulus E=206GPa, Poisson’s ratio μ=0.27 and other relevant parameters input the maximum elastic-plastic flattening amount δ m and the maximum elastic flattening amount δ t Solve the program to obtain the maximum elastoplastic flattening amount δ of the steel pipe m =7.85mm, the maximum elastic crushing amount δ t =6.11mm;

[0041] Then, call the corresponding formula in the maximum allowable flattening amount estimation table of the multi-roller straightening production practice database of steel pipes with different wall thicknesses to obtain the maximum allowable flattening amount of s...

Embodiment 2

[0045] The flattening amount and distribution ratio of each pair of straightening rollers during the straightening process of large-diameter seamless steel pipe φ920*60 are as follows:

[0046] Similarly, firstly, the inner and outer diameter ratio of the steel pipe to be straightened is λ=0.87, the average section radius R=430mm, and the yield strength σ t =785MPa, elastic modulus E=211GPa, Poisson’s ratio μ=0.27 and other relevant parameters input the maximum elastic-plastic flattening amount δ m and the maximum elastic flattening amount δ t Solve the program to obtain the maximum elastoplastic flattening amount δ of the steel pipe m =14.69mm, and the maximum elastic crushing amount δ t =9.82mm;

[0047] Then, call the corresponding formula in the maximum allowable flattening amount estimation table of the multi-roller straightening production practice database of steel pipes with different wall thicknesses to obtain the maximum allowable flattening amount of steel pipes ...

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Abstract

The invention belongs to the technical field of multi-roller straightening of seamless steel pipes, and in particular relates to a method for setting the flattening amount of straightening rollers of super-large-diameter seamless steel pipes, comprising the following steps: calculating the maximum elastic-plastic flattening amount δ of steel pipes m and the maximum elastic flattening amount δ t ; According to the corresponding relationship between the wall thickness of the steel pipe and the maximum allowable flattening amount, the maximum allowable flattening amount δ of the steel pipe is obtained a ;Maximum elastoplastic flattening amount δ m and the maximum allowable flattening amount δ a For comparison, the smaller value of the two is used as the flattening amount δ of the intermediate roller 2 , the flattening amount δ of the entrance roller 1 =k 1 δ 2 , the flattening amount δ of the exit roller 3 =k 2 δ 2 ;According to the principle that the actual flattening amount of the thin-walled pipe and the thick-walled pipe meets the principle, the actual flattening amount of each pair of straightening rollers is determined, and then the purpose of differential adjustment of the flattening amount of the straightening rollers is realized by means of the pressing system. The invention can effectively improve the ellipticity of the steel pipe after straightening and improve the straightening precision of products by setting the flattening amount of the straightening rollers. The invention is used for setting the flattening amount of the straightening roller.

Description

technical field [0001] The invention belongs to the technical field of multi-roller straightening of seamless steel pipes, and in particular relates to a method for setting the flattening amount of straightening rollers of super-large-diameter seamless steel pipes. Background technique [0002] Large-diameter seamless steel pipe is an extremely important fluid transportation channel in daily life. Therefore, there is a large demand in industries such as South-to-North Water Diversion and oil and gas transportation. In addition, due to its good load-bearing performance, large-diameter seamless steel pipes are also widely used in the field of urban infrastructure construction, such as the main body of bridges. After heat treatment, seamless steel pipes will inevitably be bent and deformed due to the influence of thermal stress and structural stress, which will affect product quality, especially API standard oil casings, oil and gas pipes, and special pipes for mechanical equip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D3/02
CPCB21D3/02
Inventor 马立峰王清华马自勇马立东
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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